Full libfuzzer shimming (for cargo-fuzz libfuzzer alternative and other use cases) (#981)

* squash libfuzzer edits

* fixup: compat with custom mutators

* use tui flag

* add introspection support

* use libfuzzer dep now that we've merged

* force input loading

* some fixes

* begin docs, impl shrink

* make whole-archive conditional and not default

* make more copies of counters maps

* lol, remember to add the observer

* make size edge map observer an observer

* fixup: make def of run driver conditional

* add sanity checks for insertion

* revert silencing of forks

* add experimental tmin support; add default asan flags

* use default options instead of specifying our own

* implement lockless mode

* fix merge

* fixup lockless corpus

* fixup for generalisation

* remove erroneous drop_in_place

* improve error logging in the case of corpus loading failure

* ok, use lock files 😔

* fix tmin

* implement merge (again); fix rare cases with maps being too small

* implement a scheduler for removing excess

* implement a walking strategy for corpus loading for large corpora

* revert filename parameter; rename and remove duplicates

* various cleanup and clippy satisfaction

* fix no_std tests

* clang-format

* expand and satisfy the clippy gods

* fix sanitizer_ifaces bindgen for no_std

* fix wasm fuzzer

* fixup clippy script

* rename and provide a small amount of explanation for sanitizer_interfaces

* fixup: HasLastReportTime

* fix clippy oddities

* restrict clippy checks to linux-only for libafl_libfuzzer_runtime

* name the mutators

* format

* fix clippy warning

* hope docker is fixed

* fix cmin lint

* clippy pass

* more docs

* more clippy

* fix remaining clippy complaints

* fix import

* miri fixes (no constructors executed)

* exclude libafl_libfuzzer from cargo-hack

* fix clippy check for sanitizer_interfaces

* fmt

* fix CI (?)

* deduplicate sancov 8bit for improved perf on ASAN

* merge 8bit coverage regions + comment out insane deduplication

* no erroring out on free hooks

* fixup for non-forking merge

* skip the corpus dir if we use it

* fixup: recent libafl changes and feature flags

* libafl_libfuzzer: use rust-lld for whole-archive feature

* clarify cause of failure

* mark unsafe

* clippy :cursed_cowboy:

* attempt to fix wasm

* spooky unknowable bug 👻

* more clippy lints

* clippy fix for merge

* use the version pin

* add unsafe to ::register

* Serdeany autoreg fix

* make type assert actionable

* miri fixes

---------

Co-authored-by: Dominik Maier <domenukk@gmail.com>
Co-authored-by: Dominik Maier <dmnk@google.com>
Co-authored-by: Mrmaxmeier <Mrmaxmeier@gmail.com>

.github/workflows/build_and_test.yml

@@ -114,6 +114,7 @@ jobs:
       with:
         profile: minimal
         toolchain: stable
+        components: llvm-tools
     - name: Install and cache deps
       uses: awalsh128/cache-apt-pkgs-action@v1.1.0
       with:

.gitignore

@@ -33,6 +33,8 @@ perf.data.old
 .vscode
 test.dict
 
+.idea/
+
 # Ignore all built fuzzers
 fuzzer_*
 AFLplusplus

Cargo.toml

@@ -10,6 +10,7 @@ members = [
     "libafl_concolic/test/runtime_test",
     "libafl_derive",
     "libafl_frida",
+    "libafl_libfuzzer",
     "libafl_nyx",
     "libafl_qemu",
     "libafl_sugar",

Dockerfile

@@ -78,6 +78,10 @@ COPY scripts/dummy.rs libafl_nyx/src/lib.rs
 COPY libafl_tinyinst/Cargo.toml libafl_tinyinst/
 COPY scripts/dummy.rs libafl_tinyinst/src/lib.rs
 
+# avoid pulling in the runtime, as this is quite an expensive build, until later
+COPY libafl_libfuzzer/Cargo.toml libafl_libfuzzer/
+COPY scripts/dummy.rs libafl_libfuzzer/src/lib.rs
+
 COPY utils utils
 
 RUN cargo build && cargo build --release
@@ -117,6 +121,10 @@ COPY libafl_concolic/symcc_runtime libafl_concolic/symcc_runtime
 COPY libafl_concolic/test libafl_concolic/test
 COPY libafl_nyx/src libafl_nyx/src
 RUN touch libafl_nyx/src/lib.rs
+COPY libafl_libfuzzer/src libafl_libfuzzer/src
+COPY libafl_libfuzzer/libafl_libfuzzer_runtime libafl_libfuzzer/libafl_libfuzzer_runtime
+COPY libafl_libfuzzer/build.rs libafl_libfuzzer/build.rs
+RUN touch libafl_libfuzzer/src/lib.rs
 RUN cargo build && cargo build --release
 
 # Copy fuzzers over

fuzzers/baby_fuzzer_wasm/pkg/package.json

@@ -11,5 +11,7 @@
   ],
   "module": "baby_fuzzer_wasm.js",
   "types": "baby_fuzzer_wasm.d.ts",
-  "sideEffects": false
+  "sideEffects": [
+    "./snippets/*"
+  ]
 }

fuzzers/baby_fuzzer_wasm/src/lib.rs

@@ -4,7 +4,7 @@ use libafl::{
     corpus::{Corpus, InMemoryCorpus},
     events::SimpleEventManager,
     executors::{ExitKind, InProcessExecutor},
-    feedbacks::{CrashFeedback, MaxMapFeedback},
+    feedbacks::{CrashFeedback, MapFeedbackMetadata, MaxMapFeedback},
     generators::RandPrintablesGenerator,
     inputs::{BytesInput, HasTargetBytes},
     monitors::SimpleMonitor,
@@ -15,7 +15,9 @@ use libafl::{
     state::{HasSolutions, StdState},
     Fuzzer, StdFuzzer,
 };
-use libafl_bolts::{current_nanos, rands::StdRand, tuples::tuple_list, AsSlice};
+use libafl_bolts::{
+    current_nanos, rands::StdRand, serdeany::RegistryBuilder, tuples::tuple_list, AsSlice,
+};
 use wasm_bindgen::prelude::*;
 use web_sys::{Performance, Window};
 
@@ -37,6 +39,10 @@ pub extern "C" fn external_current_millis() -> u64 {
 pub fn fuzz() {
     set_panic_hook();
 
+    unsafe {
+        RegistryBuilder::register::<MapFeedbackMetadata<u8>>();
+    }
+
     let mut signals = [0u8; 64];
     let signals_ptr = signals.as_mut_ptr();
     let signals_set = |i: usize| unsafe {

fuzzers/fuzzbench/src/lib.rs

@@ -60,7 +60,7 @@ use nix::{self, unistd::dup};
 pub extern "C" fn libafl_main() {
     // Registry the metadata types used in this fuzzer
     // Needed only on no_std
-    //RegistryBuilder::register::<Tokens>();
+    // unsafe { RegistryBuilder::register::<Tokens>(); }
 
     let res = match Command::new(env!("CARGO_PKG_NAME"))
         .version(env!("CARGO_PKG_VERSION"))

fuzzers/fuzzbench_fork_qemu/src/fuzzer.rs

@@ -60,7 +60,7 @@ use nix::{self, unistd::dup};
 pub fn main() {
     // Registry the metadata types used in this fuzzer
     // Needed only on no_std
-    //RegistryBuilder::register::<Tokens>();
+    // unsafe { RegistryBuilder::register::<Tokens>(); }
 
     let res = match Command::new(env!("CARGO_PKG_NAME"))
         .version(env!("CARGO_PKG_VERSION"))

fuzzers/fuzzbench_qemu/src/fuzzer.rs

@@ -69,7 +69,7 @@ pub const MAX_INPUT_SIZE: usize = 1048576; // 1MB
 pub fn main() {
     // Registry the metadata types used in this fuzzer
     // Needed only on no_std
-    //RegistryBuilder::register::<Tokens>();
+    // unsafe { RegistryBuilder::register::<Tokens>(); }
 
     let res = match Command::new(env!("CARGO_PKG_NAME"))
         .version(env!("CARGO_PKG_VERSION"))

fuzzers/fuzzbench_text/src/lib.rs

@@ -67,7 +67,7 @@ use nix::{self, unistd::dup};
 pub extern "C" fn libafl_main() {
     // Registry the metadata types used in this fuzzer
     // Needed only on no_std
-    //RegistryBuilder::register::<Tokens>();
+    // unsafe { RegistryBuilder::register::<Tokens>(); }
 
     let res = match Command::new(env!("CARGO_PKG_NAME"))
         .version(env!("CARGO_PKG_VERSION"))

fuzzers/libafl_atheris/src/lib.rs

@@ -110,7 +110,7 @@ pub extern "C" fn LLVMFuzzerRunDriver(
 ) {
     // Registry the metadata types used in this fuzzer
     // Needed only on no_std
-    //RegistryBuilder::register::<Tokens>();
+    // unsafe { RegistryBuilder::register::<Tokens>(); }
 
     assert!(harness_fn.is_some(), "No harness callback provided");
     let harness_fn = harness_fn.unwrap();

fuzzers/libfuzzer_libmozjpeg/src/lib.rs

@@ -45,7 +45,7 @@ extern "C" {
 pub extern "C" fn libafl_main() {
     // Registry the metadata types used in this fuzzer
     // Needed only on no_std
-    //RegistryBuilder::register::<Tokens>();
+    // unsafe { RegistryBuilder::register::<Tokens>(); }
 
     println!(
         "Workdir: {:?}",

fuzzers/libfuzzer_libpng/src/lib.rs

@@ -44,7 +44,7 @@ use libafl_targets::{libfuzzer_initialize, libfuzzer_test_one_input, EDGES_MAP,
 pub extern "C" fn libafl_main() {
     // Registry the metadata types used in this fuzzer
     // Needed only on no_std
-    //RegistryBuilder::register::<Tokens>();
+    // unsafe { RegistryBuilder::register::<Tokens>(); }
 
     println!(
         "Workdir: {:?}",

fuzzers/libfuzzer_libpng_accounting/src/lib.rs

@@ -115,7 +115,7 @@ struct Opt {
 pub extern "C" fn libafl_main() {
     // Registry the metadata types used in this fuzzer
     // Needed only on no_std
-    //RegistryBuilder::register::<Tokens>();
+    // unsafe { RegistryBuilder::register::<Tokens>(); }
     let opt = Opt::parse();
 
     let broker_port = opt.broker_port;

fuzzers/libfuzzer_libpng_centralized/src/lib.rs

@@ -115,7 +115,7 @@ pub extern "C" fn libafl_main() {
 
     // Registry the metadata types used in this fuzzer
     // Needed only on no_std
-    //RegistryBuilder::register::<Tokens>();
+    // unsafe { RegistryBuilder::register::<Tokens>(); }
     let opt = Opt::parse();
 
     let broker_port = opt.broker_port;

fuzzers/libfuzzer_libpng_cmin/src/lib.rs

@@ -47,7 +47,7 @@ use libafl_targets::{libfuzzer_initialize, libfuzzer_test_one_input, std_edges_m
 pub extern "C" fn libafl_main() {
     // Registry the metadata types used in this fuzzer
     // Needed only on no_std
-    //RegistryBuilder::register::<Tokens>();
+    // unsafe { RegistryBuilder::register::<Tokens>(); }
 
     println!(
         "Workdir: {:?}",

fuzzers/libfuzzer_libpng_ctx/src/lib.rs

@@ -110,7 +110,7 @@ struct Opt {
 pub extern "C" fn libafl_main() {
     // Registry the metadata types used in this fuzzer
     // Needed only on no_std
-    //RegistryBuilder::register::<Tokens>();
+    // unsafe { RegistryBuilder::register::<Tokens>(); }
     let opt = Opt::parse();
 
     let broker_port = opt.broker_port;

fuzzers/libfuzzer_libpng_launcher/src/lib.rs

@@ -113,7 +113,7 @@ struct Opt {
 pub extern "C" fn libafl_main() {
     // Registry the metadata types used in this fuzzer
     // Needed only on no_std
-    //RegistryBuilder::register::<Tokens>();
+    // unsafe { RegistryBuilder::register::<Tokens>(); }
     let opt = Opt::parse();
 
     let broker_port = opt.broker_port;

fuzzers/libfuzzer_libpng_norestart/src/lib.rs

@@ -131,7 +131,7 @@ struct Opt {
 pub extern "C" fn libafl_main() {
     // Registry the metadata types used in this fuzzer
     // Needed only on no_std
-    //RegistryBuilder::register::<Tokens>();
+    // unsafe { RegistryBuilder::register::<Tokens>(); }
     let opt = Opt::parse();
 
     let broker_port = opt.broker_port;

fuzzers/libfuzzer_libpng_tcp_manager/src/lib.rs

@@ -43,7 +43,7 @@ use libafl_targets::{libfuzzer_initialize, libfuzzer_test_one_input, EDGES_MAP,
 pub extern "C" fn libafl_main() {
     // Registry the metadata types used in this fuzzer
     // Needed only on no_std
-    //RegistryBuilder::register::<Tokens>();
+    // unsafe { RegistryBuilder::register::<Tokens>(); }
 
     println!(
         "Workdir: {:?}",

fuzzers/libfuzzer_reachability/src/lib.rs

@@ -35,7 +35,7 @@ extern "C" {
 pub extern "C" fn libafl_main() {
     // Registry the metadata types used in this fuzzer
     // Needed only on no_std
-    //RegistryBuilder::register::<Tokens>();
+    // unsafe { RegistryBuilder::register::<Tokens>(); }
 
     println!(
         "Workdir: {:?}",

fuzzers/libfuzzer_stb_image/src/main.rs

@@ -33,7 +33,7 @@ use libafl_targets::{
 pub fn main() {
     // Registry the metadata types used in this fuzzer
     // Needed only on no_std
-    //RegistryBuilder::register::<Tokens>();
+    // unsafe { RegistryBuilder::register::<Tokens>(); }
 
     println!(
         "Workdir: {:?}",

fuzzers/libfuzzer_stb_image_concolic/fuzzer/src/main.rs

@@ -63,7 +63,7 @@ struct Opt {
 pub fn main() {
     // Registry the metadata types used in this fuzzer
     // Needed only on no_std
-    //RegistryBuilder::register::<Tokens>();
+    // unsafe { RegistryBuilder::register::<Tokens>(); }
 
     let opt = Opt::parse();
 

fuzzers/libfuzzer_stb_image_sugar/src/main.rs

@@ -13,7 +13,7 @@ use libafl_targets::{libfuzzer_initialize, libfuzzer_test_one_input};
 pub fn main() {
     // Registry the metadata types used in this fuzzer
     // Needed only on no_std
-    //RegistryBuilder::register::<Tokens>();
+    // unsafe { RegistryBuilder::register::<Tokens>(); }
 
     println!(
         "Workdir: {:?}",

fuzzers/nautilus_sync/src/lib.rs

@@ -102,7 +102,7 @@ struct Opt {
 pub extern "C" fn libafl_main() {
     // Registry the metadata types used in this fuzzer
     // Needed only on no_std
-    //RegistryBuilder::register::<Tokens>();
+    // unsafe { RegistryBuilder::register::<Tokens>(); }
     let opt = Opt::parse();
 
     let broker_port = opt.broker_port;

fuzzers/tutorial/src/lib.rs

@@ -39,7 +39,7 @@ use metadata::{PacketLenFeedback, PacketLenMinimizerScheduler};
 pub extern "C" fn libafl_main() {
     // Registry the metadata types used in this fuzzer
     // Needed only on no_std
-    //RegistryBuilder::register::<Tokens>();
+    // unsafe { RegistryBuilder::register::<Tokens>(); }
 
     println!(
         "Workdir: {:?}",

libafl/src/corpus/cached.rs

@@ -1,6 +1,6 @@
 //! The [`CachedOnDiskCorpus`] stores [`Testcase`]s to disk, keeping a subset of them in memory/cache, evicting in a FIFO manner.
 
-use alloc::collections::vec_deque::VecDeque;
+use alloc::{collections::vec_deque::VecDeque, string::String};
 use core::cell::RefCell;
 use std::path::Path;
 
@@ -193,7 +193,7 @@ where
     pub fn with_meta_format<P>(
         dir_path: P,
         cache_max_len: usize,
-        meta_format: OnDiskMetadataFormat,
+        meta_format: Option<OnDiskMetadataFormat>,
     ) -> Result<Self, Error>
     where
         P: AsRef<Path>,
@@ -204,6 +204,31 @@ where
         )
     }
 
+    /// Creates the [`CachedOnDiskCorpus`] specifying the metadata format and the prefix to prepend
+    /// to each testcase.
+    ///
+    /// Will error, if [`std::fs::create_dir_all()`] failed for `dir_path`.
+    pub fn with_meta_format_and_prefix<P>(
+        dir_path: P,
+        cache_max_len: usize,
+        meta_format: Option<OnDiskMetadataFormat>,
+        prefix: Option<String>,
+        locking: bool,
+    ) -> Result<Self, Error>
+    where
+        P: AsRef<Path>,
+    {
+        Self::_new(
+            InMemoryOnDiskCorpus::with_meta_format_and_prefix(
+                dir_path,
+                meta_format,
+                prefix,
+                locking,
+            )?,
+            cache_max_len,
+        )
+    }
+
     /// Internal constructor `fn`
     fn _new(on_disk_corpus: InMemoryOnDiskCorpus<I>, cache_max_len: usize) -> Result<Self, Error> {
         if cache_max_len == 0 {
@@ -217,6 +242,11 @@ where
             cache_max_len,
         })
     }
+
+    /// Fetch the inner corpus
+    pub fn inner(&self) -> &InMemoryOnDiskCorpus<I> {
+        &self.inner
+    }
 }
 
 /// ``CachedOnDiskCorpus`` Python bindings

libafl/src/corpus/inmemory_ondisk.rs

@@ -50,6 +50,8 @@ where
     inner: InMemoryCorpus<I>,
     dir_path: PathBuf,
     meta_format: Option<OnDiskMetadataFormat>,
+    prefix: Option<String>,
+    locking: bool,
 }
 
 impl<I> UsesInput for InMemoryOnDiskCorpus<I>
@@ -209,7 +211,12 @@ where
     where
         P: AsRef<Path>,
     {
-        Self::_new(dir_path.as_ref(), Some(OnDiskMetadataFormat::JsonPretty))
+        Self::_new(
+            dir_path.as_ref(),
+            Some(OnDiskMetadataFormat::JsonPretty),
+            None,
+            true,
+        )
     }
 
     /// Creates the [`InMemoryOnDiskCorpus`] specifying the format in which `Metadata` will be saved to disk.
@@ -217,12 +224,28 @@ where
     /// Will error, if [`std::fs::create_dir_all()`] failed for `dir_path`.
     pub fn with_meta_format<P>(
         dir_path: P,
-        meta_format: OnDiskMetadataFormat,
+        meta_format: Option<OnDiskMetadataFormat>,
     ) -> Result<Self, Error>
     where
         P: AsRef<Path>,
     {
-        Self::_new(dir_path.as_ref(), Some(meta_format))
+        Self::_new(dir_path.as_ref(), meta_format, None, true)
+    }
+
+    /// Creates the [`InMemoryOnDiskCorpus`] specifying the format in which `Metadata` will be saved to disk
+    /// and the prefix for the filenames.
+    ///
+    /// Will error, if [`std::fs::create_dir_all()`] failed for `dir_path`.
+    pub fn with_meta_format_and_prefix<P>(
+        dir_path: P,
+        meta_format: Option<OnDiskMetadataFormat>,
+        prefix: Option<String>,
+        locking: bool,
+    ) -> Result<Self, Error>
+    where
+        P: AsRef<Path>,
+    {
+        Self::_new(dir_path.as_ref(), meta_format, prefix, locking)
     }
 
     /// Creates an [`InMemoryOnDiskCorpus`] that will not store .metadata files
@@ -232,16 +255,27 @@ where
     where
         P: AsRef<Path>,
     {
-        Self::_new(dir_path.as_ref(), None)
+        Self::_new(dir_path.as_ref(), None, None, true)
     }
 
     /// Private fn to crate a new corpus at the given (non-generic) path with the given optional `meta_format`
-    fn _new(dir_path: &Path, meta_format: Option<OnDiskMetadataFormat>) -> Result<Self, Error> {
+    fn _new(
-        fs::create_dir_all(dir_path)?;
+        dir_path: &Path,
+        meta_format: Option<OnDiskMetadataFormat>,
+        prefix: Option<String>,
+        locking: bool,
+    ) -> Result<Self, Error> {
+        match fs::create_dir_all(dir_path) {
+            Ok(()) => {}
+            Err(e) if e.kind() == std::io::ErrorKind::AlreadyExists => {}
+            Err(e) => return Err(e.into()),
+        }
         Ok(InMemoryOnDiskCorpus {
             inner: InMemoryCorpus::new(),
             dir_path: dir_path.into(),
             meta_format,
+            prefix,
+            locking,
         })
     }
 
@@ -265,6 +299,7 @@ where
                 return Ok(());
             }
 
+            if self.locking {
                 let new_lock_filename = format!(".{new_filename}.lafl_lock");
 
                 // Try to create lock file for new testcases
@@ -279,6 +314,7 @@ where
                         "unable to create lock file for new testcase",
                     ));
                 }
+            }
 
             let new_file_path = self.dir_path.join(&new_filename);
 
@@ -311,18 +347,15 @@ where
     fn save_testcase(&self, testcase: &mut Testcase<I>, idx: CorpusId) -> Result<(), Error> {
         let file_name_orig = testcase.filename_mut().take().unwrap_or_else(|| {
             // TODO walk entry metadata to ask for pieces of filename (e.g. :havoc in AFL)
-
             testcase.input().as_ref().unwrap().generate_name(idx.0)
         });
-        if testcase.file_path().is_some() {
+
-            // We already have a valid path, no need to do calculate anything
-            *testcase.filename_mut() = Some(file_name_orig);
-        } else {
         // New testcase, we need to save it.
         let mut file_name = file_name_orig.clone();
 
         let mut ctr = 2;
-            let file_name = loop {
+        let file_name = if self.locking {
+            loop {
                 let lockfile_name = format!(".{file_name}.lafl_lock");
                 let lockfile_path = self.dir_path.join(lockfile_name);
 
@@ -337,11 +370,19 @@ where
 
                 file_name = format!("{file_name_orig}-{ctr}");
                 ctr += 1;
+            }
+        } else {
+            file_name
         };
 
+        if testcase
+            .file_path()
+            .as_ref()
+            .map_or(true, |path| !path.starts_with(&self.dir_path))
+        {
             *testcase.file_path_mut() = Some(self.dir_path.join(&file_name));
-            *testcase.filename_mut() = Some(file_name);
         }
+        *testcase.filename_mut() = Some(file_name);
 
         if self.meta_format.is_some() {
             let metafile_name = format!(".{}.metadata", testcase.filename().as_ref().unwrap());
@@ -389,6 +430,12 @@ where
         }
         Ok(())
     }
+
+    /// Path to the corpus directory associated with this corpus
+    #[must_use]
+    pub fn dir_path(&self) -> &PathBuf {
+        &self.dir_path
+    }
 }
 
 #[cfg(feature = "python")]

libafl/src/corpus/minimizer.rs

@@ -8,16 +8,18 @@ use alloc::{
 use core::{hash::Hash, marker::PhantomData};
 
 use hashbrown::{HashMap, HashSet};
-use libafl_bolts::{tuples::MatchName, AsIter, Named};
+use libafl_bolts::{current_time, tuples::MatchName, AsIter, Named};
 use num_traits::ToPrimitive;
 use z3::{ast::Bool, Config, Context, Optimize};
 
 use crate::{
     corpus::Corpus,
+    events::{Event, EventFirer, LogSeverity},
     executors::{Executor, HasObservers},
+    monitors::UserStats,
     observers::{MapObserver, ObserversTuple},
     schedulers::{LenTimeMulTestcaseScore, RemovableScheduler, Scheduler, TestcaseScore},
-    state::{HasCorpus, HasMetadata, UsesState},
+    state::{HasCorpus, HasExecutions, HasMetadata, UsesState},
     Error, HasScheduler,
 };
 
@@ -39,7 +41,7 @@ where
     where
         E: Executor<EM, Z> + HasObservers,
         CS: Scheduler<State = E::State> + RemovableScheduler, // schedulers that has on_remove/on_replace only!
-        EM: UsesState<State = E::State>,
+        EM: EventFirer<State = E::State>,
         Z: HasScheduler<Scheduler = CS, State = E::State>;
 }
 
@@ -84,10 +86,11 @@ impl<E, O, T, TS> CorpusMinimizer<E> for MapCorpusMinimizer<E, O, T, TS>
 where
     E: UsesState,
     for<'a> O: MapObserver<Entry = T> + AsIter<'a, Item = T>,
-    E::State: HasMetadata + HasCorpus,
+    E::State: HasMetadata + HasCorpus + HasExecutions,
     T: Copy + Hash + Eq,
     TS: TestcaseScore<E::State>,
 {
+    #[allow(clippy::too_many_lines)]
     fn minimize<CS, EM, Z>(
         &self,
         fuzzer: &mut Z,
@@ -98,7 +101,7 @@ where
     where
         E: Executor<EM, Z> + HasObservers,
         CS: Scheduler<State = E::State> + RemovableScheduler,
-        EM: UsesState<State = E::State>,
+        EM: EventFirer<State = E::State>,
         Z: HasScheduler<Scheduler = CS, State = E::State>,
     {
         let cfg = Config::default();
@@ -109,6 +112,15 @@ where
         let mut cov_map = HashMap::new();
 
         let mut cur_id = state.corpus().first();
+
+        manager.log(
+            state,
+            LogSeverity::Info,
+            "Executing each input...".to_string(),
+        )?;
+
+        let total = state.corpus().count() as u64;
+        let mut curr = 0;
         while let Some(idx) = cur_id {
             let (weight, input) = {
                 let mut testcase = state.corpus().get(idx)?.borrow_mut();
@@ -130,6 +142,29 @@ where
                 .observers_mut()
                 .post_exec_all(state, &input, &kind)?;
 
+            *state.executions_mut() += 1;
+            let executions = *state.executions();
+
+            curr += 1;
+
+            manager.fire(
+                state,
+                Event::UpdateUserStats {
+                    name: "minimisation exec pass".to_string(),
+                    value: UserStats::Ratio(curr, total),
+                    phantom: PhantomData,
+                },
+            )?;
+
+            manager.fire(
+                state,
+                Event::UpdateExecStats {
+                    time: current_time(),
+                    phantom: PhantomData,
+                    executions,
+                },
+            )?;
+
             let seed_expr = Bool::fresh_const(&ctx, "seed");
             let obs: &O = executor
                 .observers()
@@ -155,6 +190,12 @@ where
             cur_id = state.corpus().next(idx);
         }
 
+        manager.log(
+            state,
+            LogSeverity::Info,
+            "Preparing Z3 assertions...".to_string(),
+        )?;
+
         for (_, cov) in cov_map {
             for (_, seeds) in cov {
                 // At least one seed for each hit count of each coverage map index
@@ -176,6 +217,7 @@ where
             opt.assert_soft(&!seed, *weight, None);
         }
 
+        manager.log(state, LogSeverity::Info, "Performing MaxSAT...".to_string())?;
         // Perform the optimization!
         opt.check(&[]);
 

libafl/src/corpus/ondisk.rs

@@ -4,6 +4,7 @@
 //! For any other occasions, consider using [`crate::corpus::CachedOnDiskCorpus`]
 //! which stores a certain number of testcases in memory and removes additional ones in a FIFO manner.
 
+use alloc::string::String;
 use core::{cell::RefCell, time::Duration};
 use std::path::{Path, PathBuf};
 
@@ -34,7 +35,6 @@ pub enum OnDiskMetadataFormat {
 }
 
 /// The [`Testcase`] metadata that'll be stored to disk
-#[cfg(feature = "std")]
 #[derive(Debug, Serialize)]
 pub struct OnDiskMetadata<'a> {
     /// The dynamic metadata [`SerdeAnyMap`] stored to disk
@@ -48,7 +48,6 @@ pub struct OnDiskMetadata<'a> {
 /// A corpus able to store [`Testcase`]s to disk, and load them from disk, when they are being used.
 ///
 /// Metadata is written to a `.<filename>.metadata` file in the same folder by default.
-#[cfg(feature = "std")]
 #[derive(Default, Serialize, Deserialize, Clone, Debug)]
 #[serde(bound = "I: serde::de::DeserializeOwned")]
 pub struct OnDiskCorpus<I>
@@ -188,7 +187,27 @@ where
     where
         P: AsRef<Path>,
     {
-        Self::_new(dir_path.as_ref(), OnDiskMetadataFormat::JsonPretty)
+        Self::with_meta_format_and_prefix(
+            dir_path.as_ref(),
+            Some(OnDiskMetadataFormat::JsonPretty),
+            None,
+            true,
+        )
+    }
+
+    /// Creates the [`OnDiskCorpus`] with a filename prefix.
+    ///
+    /// Will error, if [`std::fs::create_dir_all()`] failed for `dir_path`.
+    pub fn with_prefix<P>(dir_path: P, prefix: Option<String>) -> Result<Self, Error>
+    where
+        P: AsRef<Path>,
+    {
+        Self::with_meta_format_and_prefix(
+            dir_path.as_ref(),
+            Some(OnDiskMetadataFormat::JsonPretty),
+            prefix,
+            true,
+        )
     }
 
     /// Creates the [`OnDiskCorpus`] specifying the format in which `Metadata` will be saved to disk.
@@ -201,16 +220,45 @@ where
     where
         P: AsRef<Path>,
     {
-        Self::_new(dir_path.as_ref(), meta_format)
+        Self::with_meta_format_and_prefix(dir_path.as_ref(), Some(meta_format), None, true)
     }
 
-    /// Private fn to crate a new corpus at the given (non-generic) path with the given optional `meta_format`
+    /// Creates an [`OnDiskCorpus`] that will not store .metadata files
-    fn _new(dir_path: &Path, meta_format: OnDiskMetadataFormat) -> Result<Self, Error> {
+    ///
+    /// Will error, if [`std::fs::create_dir_all()`] failed for `dir_path`.
+    pub fn no_meta<P>(dir_path: P) -> Result<Self, Error>
+    where
+        P: AsRef<Path>,
+    {
+        Self::with_meta_format_and_prefix(dir_path.as_ref(), None, None, true)
+    }
+
+    /// Creates a new corpus at the given (non-generic) path with the given optional `meta_format`
+    /// and `prefix`.
+    ///
+    /// Will error, if [`std::fs::create_dir_all()`] failed for `dir_path`.
+    pub fn with_meta_format_and_prefix(
+        dir_path: &Path,
+        meta_format: Option<OnDiskMetadataFormat>,
+        prefix: Option<String>,
+        locking: bool,
+    ) -> Result<Self, Error> {
         Ok(OnDiskCorpus {
             dir_path: dir_path.into(),
-            inner: CachedOnDiskCorpus::with_meta_format(dir_path, 1, meta_format)?,
+            inner: CachedOnDiskCorpus::with_meta_format_and_prefix(
+                dir_path,
+                1,
+                meta_format,
+                prefix,
+                locking,
+            )?,
         })
     }
+
+    /// Path to the corpus directory associated with this corpus
+    pub fn dir_path(&self) -> &PathBuf {
+        &self.dir_path
+    }
 }
 
 #[cfg(feature = "python")]

libafl/src/corpus/testcase.rs

@@ -204,7 +204,17 @@ where
         input.wrapped_as_testcase();
         Self {
             input: Some(input),
-            ..Testcase::default()
+            filename: None,
+            #[cfg(feature = "std")]
+            file_path: None,
+            metadata: SerdeAnyMap::default(),
+            #[cfg(feature = "std")]
+            metadata_path: None,
+            exec_time: None,
+            cached_len: None,
+            executions: 0,
+            scheduled_count: 0,
+            parent_id: None,
         }
     }
 
@@ -212,10 +222,19 @@ where
     /// that this [`Testcase`] was derived from on creation
     pub fn with_parent_id(mut input: I, parent_id: CorpusId) -> Self {
         input.wrapped_as_testcase();
-        Self {
+        Testcase {
             input: Some(input),
+            filename: None,
+            #[cfg(feature = "std")]
+            file_path: None,
+            metadata: SerdeAnyMap::default(),
+            #[cfg(feature = "std")]
+            metadata_path: None,
+            exec_time: None,
+            cached_len: None,
+            executions: 0,
+            scheduled_count: 0,
             parent_id: Some(parent_id),
-            ..Testcase::default()
         }
     }
 
@@ -226,7 +245,16 @@ where
         Self {
             input: Some(input),
             filename: Some(filename),
-            ..Testcase::default()
+            #[cfg(feature = "std")]
+            file_path: None,
+            metadata: SerdeAnyMap::default(),
+            #[cfg(feature = "std")]
+            metadata_path: None,
+            exec_time: None,
+            cached_len: None,
+            executions: 0,
+            scheduled_count: 0,
+            parent_id: None,
         }
     }
 
@@ -236,8 +264,17 @@ where
         input.wrapped_as_testcase();
         Self {
             input: Some(input),
+            filename: None,
+            #[cfg(feature = "std")]
+            file_path: None,
+            metadata: SerdeAnyMap::default(),
+            #[cfg(feature = "std")]
+            metadata_path: None,
+            exec_time: None,
+            cached_len: None,
             executions,
-            ..Testcase::default()
+            scheduled_count: 0,
+            parent_id: None,
         }
     }
 
@@ -436,6 +473,21 @@ impl SchedulerTestcaseMetadata {
 
 libafl_bolts::impl_serdeany!(SchedulerTestcaseMetadata);
 
+#[cfg(feature = "std")]
+impl<I> Drop for Testcase<I>
+where
+    I: Input,
+{
+    fn drop(&mut self) {
+        if let Some(filename) = &self.filename {
+            let mut path = PathBuf::from(filename);
+            let lockname = format!(".{}.lafl_lock", path.file_name().unwrap().to_str().unwrap());
+            path.set_file_name(lockname);
+            let _ = std::fs::remove_file(path);
+        }
+    }
+}
+
 #[cfg(feature = "python")]
 #[allow(missing_docs)]
 /// `Testcase` Python bindings

libafl/src/executors/inprocess.rs

@@ -847,8 +847,6 @@ mod unix_signal_handler {
             ExitKind::Timeout,
         );
 
-        event_mgr.await_restart_safe();
-
         libc::_exit(55);
     }
 

libafl/src/feedbacks/map.rs

@@ -322,7 +322,7 @@ where
 
 libafl_bolts::impl_serdeany!(
     MapFeedbackMetadata<T: Debug + Default + Copy + 'static + Serialize + DeserializeOwned>,
-    <u8>,<u16>,<u32>,<u64>,<i8>,<i16>,<i32>,<i64>,<f32>,<f64>,<bool>,<char>
+    <u8>,<u16>,<u32>,<u64>,<i8>,<i16>,<i32>,<i64>,<f32>,<f64>,<bool>,<char>,<usize>
 );
 
 impl<T> MapFeedbackMetadata<T>
@@ -456,6 +456,10 @@ where
             .named_metadata_map_mut()
             .get_mut::<MapFeedbackMetadata<T>>(&self.name)
             .unwrap();
+        let len = observer.len();
+        if map_state.history_map.len() < len {
+            map_state.history_map.resize(len, observer.initial());
+        }
 
         let history_map = map_state.history_map.as_mut_slice();
         if self.indexes {

libafl/src/fuzzer/mod.rs

@@ -338,9 +338,9 @@ where
     /// Evaluate if a set of observation channels has an interesting state
     fn process_execution<EM>(
         &mut self,
-        state: &mut CS::State,
+        state: &mut Self::State,
         manager: &mut EM,
-        input: <CS::State as UsesInput>::Input,
+        input: <Self::State as UsesInput>::Input,
         observers: &OT,
         exit_kind: &ExitKind,
         send_events: bool,
@@ -489,10 +489,10 @@ where
     #[inline]
     fn evaluate_input_events(
         &mut self,
-        state: &mut CS::State,
+        state: &mut Self::State,
         executor: &mut E,
         manager: &mut EM,
-        input: <CS::State as UsesInput>::Input,
+        input: <Self::State as UsesInput>::Input,
         send_events: bool,
     ) -> Result<(ExecuteInputResult, Option<CorpusId>), Error> {
         self.evaluate_input_with_observers(state, executor, manager, input, send_events)
@@ -501,47 +501,57 @@ where
     /// Adds an input, even if it's not considered `interesting` by any of the executors
     fn add_input(
         &mut self,
-        state: &mut CS::State,
+        state: &mut Self::State,
         executor: &mut E,
         manager: &mut EM,
-        input: <CS::State as UsesInput>::Input,
+        input: <Self::State as UsesInput>::Input,
     ) -> Result<CorpusId, Error> {
         let exit_kind = self.execute_input(state, executor, manager, &input)?;
         let observers = executor.observers();
         // Always consider this to be "interesting"
+        let mut testcase = Testcase::with_executions(input.clone(), *state.executions());
 
-        // However, we still want to trigger the side effects of objectives and feedbacks.
+        // Maybe a solution
         #[cfg(not(feature = "introspection"))]
-        let _is_solution = self
+        let is_solution = self
             .objective_mut()
             .is_interesting(state, manager, &input, observers, &exit_kind)?;
 
         #[cfg(feature = "introspection")]
-        let _is_solution = self
+        let is_solution = self
             .objective_mut()
             .is_interesting_introspection(state, manager, &input, observers, &exit_kind)?;
 
-        #[cfg(not(feature = "introspection"))]
+        if is_solution {
-        let _is_corpus = self
+            self.objective_mut()
-            .feedback_mut()
+                .append_metadata(state, observers, &mut testcase)?;
-            .is_interesting(state, manager, &input, observers, &exit_kind)?;
+            let idx = state.solutions_mut().add(testcase)?;
 
-        #[cfg(feature = "introspection")]
+            manager.fire(
-        let _is_corpus = self
+                state,
-            .feedback_mut()
+                Event::Objective {
-            .is_interesting_introspection(state, manager, &input, observers, &exit_kind)?;
+                    objective_size: state.solutions().count(),
+                },
+            )?;
+            return Ok(idx);
+        }
 
         // Not a solution
         self.objective_mut().discard_metadata(state, &input)?;
 
         // several is_interesting implementations collect some data about the run, later used in
         // append_metadata; we *must* invoke is_interesting here to collect it
-        let _: bool = self
+        #[cfg(not(feature = "introspection"))]
+        let _is_corpus = self
             .feedback_mut()
             .is_interesting(state, manager, &input, observers, &exit_kind)?;
 
+        #[cfg(feature = "introspection")]
+        let _is_corpus = self
+            .feedback_mut()
+            .is_interesting_introspection(state, manager, &input, observers, &exit_kind)?;
+
         // Add the input to the main corpus
-        let mut testcase = Testcase::with_executions(input.clone(), *state.executions());
         self.feedback_mut()
             .append_metadata(state, observers, &mut testcase)?;
         let idx = state.corpus_mut().add(testcase)?;

libafl/src/lib.rs

@@ -26,7 +26,8 @@ Welcome to `LibAFL`
     clippy::missing_panics_doc,
     clippy::missing_docs_in_private_items,
     clippy::module_name_repetitions,
-    clippy::ptr_cast_constness
+    clippy::ptr_cast_constness,
+    clippy::unsafe_derive_deserialize
 )]
 #![cfg_attr(not(test), warn(
     missing_debug_implementations,

libafl/src/monitors/mod.rs

@@ -371,8 +371,14 @@ impl Monitor for SimplePrintingMonitor {
     }
 
     fn display(&mut self, event_msg: String, sender_id: ClientId) {
+        let mut userstats = self.client_stats()[sender_id.0 as usize]
+            .user_monitor
+            .iter()
+            .map(|(key, value)| format!("{key}: {value}"))
+            .collect::<Vec<_>>();
+        userstats.sort();
         println!(
-            "[{} #{}] run time: {}, clients: {}, corpus: {}, objectives: {}, executions: {}, exec/sec: {}",
+            "[{} #{}] run time: {}, clients: {}, corpus: {}, objectives: {}, executions: {}, exec/sec: {}, {}",
             event_msg,
             sender_id.0,
             format_duration_hms(&(current_time() - self.start_time)),
@@ -380,7 +386,8 @@ impl Monitor for SimplePrintingMonitor {
             self.corpus_size(),
             self.objective_size(),
             self.total_execs(),
-            self.execs_per_sec_pretty()
+            self.execs_per_sec_pretty(),
+            userstats.join(", ")
         );
 
         // Only print perf monitor if the feature is enabled

libafl/src/monitors/multi.rs

@@ -3,14 +3,17 @@
 #[cfg(feature = "introspection")]
 use alloc::string::ToString;
 use alloc::{string::String, vec::Vec};
-use core::{fmt::Write, time::Duration};
+use core::{
+    fmt::{Debug, Formatter, Write},
+    time::Duration,
+};
 
 use libafl_bolts::{current_time, format_duration_hms, ClientId};
 
 use crate::monitors::{ClientStats, Monitor};
 
 /// Tracking monitor during fuzzing and display both per-client and cumulative info.
-#[derive(Clone, Debug)]
+#[derive(Clone)]
 pub struct MultiMonitor<F>
 where
     F: FnMut(String),
@@ -20,6 +23,18 @@ where
     client_stats: Vec<ClientStats>,
 }
 
+impl<F> Debug for MultiMonitor<F>
+where
+    F: FnMut(String),
+{
+    fn fmt(&self, f: &mut Formatter<'_>) -> core::fmt::Result {
+        f.debug_struct("MultiMonitor")
+            .field("start_time", &self.start_time)
+            .field("client_stats", &self.client_stats)
+            .finish_non_exhaustive()
+    }
+}
+
 impl<F> Monitor for MultiMonitor<F>
 where
     F: FnMut(String),

libafl/src/mutators/scheduled.rs

@@ -8,7 +8,7 @@ use core::{
 
 use libafl_bolts::{
     rands::Rand,
-    tuples::{tuple_list, tuple_list_type, NamedTuple},
+    tuples::{tuple_list, tuple_list_type, Merge, NamedTuple},
     AsMutSlice, AsSlice, Named,
 };
 use serde::{Deserialize, Serialize};
@@ -218,6 +218,38 @@ where
     }
 }
 
+/// Tuple type of the mutations that compose the Havoc mutator without crossover mutations
+pub type HavocMutationsNoCrossoverType = tuple_list_type!(
+    BitFlipMutator,
+    ByteFlipMutator,
+    ByteIncMutator,
+    ByteDecMutator,
+    ByteNegMutator,
+    ByteRandMutator,
+    ByteAddMutator,
+    WordAddMutator,
+    DwordAddMutator,
+    QwordAddMutator,
+    ByteInterestingMutator,
+    WordInterestingMutator,
+    DwordInterestingMutator,
+    BytesDeleteMutator,
+    BytesDeleteMutator,
+    BytesDeleteMutator,
+    BytesDeleteMutator,
+    BytesExpandMutator,
+    BytesInsertMutator,
+    BytesRandInsertMutator,
+    BytesSetMutator,
+    BytesRandSetMutator,
+    BytesCopyMutator,
+    BytesInsertCopyMutator,
+    BytesSwapMutator,
+);
+
+/// Tuple type of the mutations that compose the Havoc mutator's crossover mutations
+pub type HavocCrossoverType = tuple_list_type!(CrossoverInsertMutator, CrossoverReplaceMutator);
+
 /// Tuple type of the mutations that compose the Havoc mutator
 pub type HavocMutationsType = tuple_list_type!(
     BitFlipMutator,
@@ -249,9 +281,9 @@ pub type HavocMutationsType = tuple_list_type!(
     CrossoverReplaceMutator,
 );
 
-/// Get the mutations that compose the Havoc mutator
+/// Get the mutations that compose the Havoc mutator (only applied to single inputs)
 #[must_use]
-pub fn havoc_mutations() -> HavocMutationsType {
+pub fn havoc_mutations_no_crossover() -> HavocMutationsNoCrossoverType {
     tuple_list!(
         BitFlipMutator::new(),
         ByteFlipMutator::new(),
@@ -278,11 +310,24 @@ pub fn havoc_mutations() -> HavocMutationsType {
         BytesCopyMutator::new(),
         BytesInsertCopyMutator::new(),
         BytesSwapMutator::new(),
+    )
+}
+
+/// Get the mutations that compose the Havoc mutator's crossover strategy
+#[must_use]
+pub fn havoc_crossover() -> HavocCrossoverType {
+    tuple_list!(
         CrossoverInsertMutator::new(),
         CrossoverReplaceMutator::new(),
     )
 }
 
+/// Get the mutations that compose the Havoc mutator
+#[must_use]
+pub fn havoc_mutations() -> HavocMutationsType {
+    havoc_mutations_no_crossover().merge(havoc_crossover())
+}
+
 /// Get the mutations that uses the Tokens metadata
 #[must_use]
 pub fn tokens_mutations() -> tuple_list_type!(TokenInsert, TokenReplace) {

libafl/src/schedulers/probabilistic_sampling.rs

@@ -191,6 +191,11 @@ mod tests {
 
     #[test]
     fn test_prob_sampling() {
+        #[cfg(any(not(feature = "serdeany_autoreg"), miri))]
+        unsafe {
+            super::ProbabilityMetadata::register();
+        }
+
         // the first 3 probabilities will be .69, .86, .44
         let rand = StdRand::with_seed(12);
 

libafl/src/schedulers/testcase_score.rs

@@ -112,7 +112,11 @@ where
             .as_nanos() as f64;
 
         let avg_exec_us = psmeta.exec_time().as_nanos() as f64 / psmeta.cycles() as f64;
-        let avg_bitmap_size = psmeta.bitmap_size() / psmeta.bitmap_entries();
+        let avg_bitmap_size = if psmeta.bitmap_entries() == 0 {
+            1
+        } else {
+            psmeta.bitmap_size() / psmeta.bitmap_entries()
+        };
 
         let favored = entry.has_metadata::<IsFavoredMetadata>();
         let tcmeta = entry.metadata::<SchedulerTestcaseMetadata>()?;

libafl/src/stages/generalization.rs

@@ -100,6 +100,9 @@ where
                         "MapNoveltiesMetadata needed for GeneralizationStage not found in testcase #{corpus_idx} (check the arguments of MapFeedback::new(...))"
                     ))
                 })?;
+            if meta.as_slice().is_empty() {
+                return Ok(()); // don't generalise inputs which don't have novelties
+            }
             (payload, original, meta.as_slice().to_vec())
         };
 

libafl/src/state/mod.rs

@@ -260,6 +260,9 @@ pub struct StdState<I, C, R, SC> {
     #[cfg(feature = "std")]
     /// Remaining initial inputs to load, if any
     remaining_initial_files: Option<Vec<PathBuf>>,
+    #[cfg(feature = "std")]
+    /// Remaining initial inputs to load, if any
+    dont_reenter: Option<Vec<PathBuf>>,
     /// The last time we reported progress (if available/used).
     /// This information is used by fuzzer `maybe_report_progress`.
     last_report_time: Option<Duration>,
@@ -458,11 +461,15 @@ where
     }
 
     /// List initial inputs from a directory.
-    fn visit_initial_directory(files: &mut Vec<PathBuf>, in_dir: &Path) -> Result<(), Error> {
+    fn next_file(&mut self) -> Result<PathBuf, Error> {
-        for entry in fs::read_dir(in_dir)? {
+        loop {
-            let entry = entry?;
+            if let Some(path) = self.remaining_initial_files.as_mut().and_then(Vec::pop) {
-            let path = entry.path();
+                let filename = path.file_name().unwrap().to_string_lossy();
-            if path.file_name().unwrap().to_string_lossy().starts_with('.') {
+                if filename.starts_with('.')
+                // || filename
+                //     .rsplit_once('-')
+                //     .map_or(false, |(_, s)| u64::from_str(s).is_ok())
+                {
                     continue;
                 }
 
@@ -475,13 +482,27 @@ where
                 let attr = attributes?;
 
                 if attr.is_file() && attr.len() > 0 {
-                files.push(path);
+                    return Ok(path);
                 } else if attr.is_dir() {
-                Self::visit_initial_directory(files, &path)?;
+                    let files = self.remaining_initial_files.as_mut().unwrap();
+                    path.read_dir()?
+                        .try_for_each(|entry| entry.map(|e| files.push(e.path())))?;
+                } else if attr.is_symlink() {
+                    let path = fs::canonicalize(path)?;
+                    let dont_reenter = self.dont_reenter.get_or_insert_with(Default::default);
+                    if dont_reenter.iter().any(|p| path.starts_with(p)) {
+                        continue;
+                    }
+                    if path.is_dir() {
+                        dont_reenter.push(path.clone());
+                    }
+                    let files = self.remaining_initial_files.as_mut().unwrap();
+                    files.push(path);
+                }
+            } else {
+                return Err(Error::iterator_end("No remaining files to load."));
             }
         }
-
-        Ok(())
     }
 
     /// Loads initial inputs from the passed-in `in_dirs`.
@@ -506,11 +527,13 @@ where
                 return Ok(());
             }
         } else {
-            let mut files = vec![];
+            let files = in_dirs.iter().try_fold(Vec::new(), |mut res, file| {
-            for in_dir in in_dirs {
+                file.canonicalize().map(|canonicalized| {
-                Self::visit_initial_directory(&mut files, in_dir)?;
+                    res.push(canonicalized);
-            }
+                    res
-
+                })
+            })?;
+            self.dont_reenter = Some(files.clone());
             self.remaining_initial_files = Some(files);
         }
 
@@ -562,11 +585,9 @@ where
         EM: EventFirer<State = Self>,
         Z: Evaluator<E, EM, State = Self>,
     {
-        if self.remaining_initial_files.is_none() {
+        loop {
-            return Err(Error::illegal_state("No initial files were loaded, cannot continue loading. Call a `load_initial_input` fn first!"));
+            match self.next_file() {
-        }
+                Ok(path) => {
-
-        while let Some(path) = self.remaining_initial_files.as_mut().unwrap().pop() {
                     log::info!("Loading file {:?} ...", &path);
                     let input = loader(fuzzer, self, &path)?;
                     if forced {
@@ -578,6 +599,10 @@ where
                         }
                     }
                 }
+                Err(Error::IteratorEnd(_, _)) => break,
+                Err(e) => return Err(e),
+            }
+        }
 
         manager.fire(
             self,
@@ -797,6 +822,8 @@ where
             introspection_monitor: ClientPerfMonitor::new(),
             #[cfg(feature = "std")]
             remaining_initial_files: None,
+            #[cfg(feature = "std")]
+            dont_reenter: None,
             last_report_time: None,
             phantom: PhantomData,
         };

libafl_bolts/src/anymap.rs

@@ -52,7 +52,11 @@ pub const fn pack_type_id(id: u128) -> TypeId {
     match size_of::<TypeId>() {
         8 => {
             let id_64 = id as u64;
-            unsafe { *(addr_of!(id_64) as *const TypeId) }
+            // false positive: this branch only executes on 64 bit `TypeId`s
+            #[allow(clippy::cast_ptr_alignment)]
+            unsafe {
+                *(addr_of!(id_64) as *const TypeId)
+            }
         }
         16 => unsafe { *(addr_of!(id) as *const TypeId) },
         _ => {

libafl_bolts/src/serdeany.rs

@@ -178,6 +178,7 @@ macro_rules! create_serde_registry_for_trait {
 
             /// A (de)serializable anymap containing (de)serializable trait objects registered
             /// in the registry
+            #[allow(clippy::unsafe_derive_deserialize)]
             #[derive(Debug, Serialize, Deserialize)]
             pub struct SerdeAnyMap {
                 map: HashMap<u128, Box<dyn $trait_name>>,
@@ -252,8 +253,7 @@ macro_rules! create_serde_registry_for_trait {
                 where
                     T: $trait_name,
                 {
-                    self.map
+                    self.insert_boxed(Box::new(t));
-                        .insert(unpack_type_id(TypeId::of::<T>()), Box::new(t));
                 }
 
                 /// Insert a boxed element into the map.
@@ -262,7 +262,21 @@ macro_rules! create_serde_registry_for_trait {
                 where
                     T: $trait_name,
                 {
-                    self.map.insert(unpack_type_id(TypeId::of::<T>()), t);
+                    let id = unpack_type_id(TypeId::of::<T>());
+                    assert!(
+                        unsafe {
+                            REGISTRY
+                                .deserializers
+                                .as_ref()
+                                .expect("Empty types registry")
+                                .get(&id)
+                                .is_some()
+                        },
+                        "Type {} was inserted without registration! Call {}::register or use serde_autoreg.",
+                        core::any::type_name::<T>(),
+                        core::any::type_name::<T>()
+                    );
+                    self.map.insert(id, t);
                 }
 
                 /// Returns the count of elements in this map.
@@ -304,6 +318,7 @@ macro_rules! create_serde_registry_for_trait {
             }
 
             /// A serializable [`HashMap`] wrapper for [`SerdeAny`] types, addressable by name.
+            #[allow(clippy::unsafe_derive_deserialize)]
             #[allow(unused_qualifications)]
             #[derive(Debug, Serialize, Deserialize)]
             pub struct NamedSerdeAnyMap {
@@ -518,6 +533,19 @@ macro_rules! create_serde_registry_for_trait {
                     T: $trait_name,
                 {
                     let id = unpack_type_id(TypeId::of::<T>());
+                    assert!(
+                        unsafe {
+                            REGISTRY
+                                .deserializers
+                                .as_ref()
+                                .expect("Empty types registry")
+                                .get(&id)
+                                .is_some()
+                        },
+                        "Type {} was inserted without registration! Call {}::register or use serde_autoreg.",
+                        core::any::type_name::<T>(),
+                        core::any::type_name::<T>()
+                    );
                     if !self.map.contains_key(&id) {
                         self.map.insert(id, HashMap::default());
                     }
@@ -619,7 +647,7 @@ macro_rules! create_register {
     ($struct_type:ty) => {
         const _: () = {
             /// Automatically register this type
-            #[cfg(feature = "serdeany_autoreg")]
+            #[cfg(all(feature = "serdeany_autoreg", not(miri)))]
             #[$crate::ctor]
             fn register() {
                 // # Safety

libafl_libfuzzer/Cargo.toml

@@ -0,0 +1,24 @@
+[package]
+name = "libafl_libfuzzer"
+version.workspace = true
+description = "libFuzzer shim which uses LibAFL with common defaults"
+repository = "https://github.com/AFLplusplus/LibAFL/"
+readme = "../README.md"
+license = "MIT OR Apache-2.0"
+keywords = ["fuzzing", "testing", "security"]
+edition = "2021"
+categories = ["development-tools::testing", "fuzzing"]
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[build-dependencies]
+cc = "1.0"
+rustversion = "1.0"
+
+[features]
+arbitrary-derive = ["libfuzzer-sys/arbitrary-derive"]
+introspection = []
+whole-archive = []
+
+[dependencies]
+libfuzzer-sys = { version = "0.4.7", default-features = false }

libafl_libfuzzer/build.rs

@@ -0,0 +1,116 @@
+use std::{path::PathBuf, process::Command};
+
+fn main() {
+    if cfg!(feature = "cargo-clippy") {
+        return; // skip when clippy is running
+    }
+    if cfg!(not(target_os = "linux")) {
+        println!(
+            "cargo:error=The libafl_libfuzzer runtime may only be built for linux; failing fast."
+        );
+        return;
+    }
+    println!("cargo:rerun-if-changed=libafl_libfuzzer_runtime/src");
+    println!("cargo:rerun-if-changed=libafl_libfuzzer_runtime/Cargo.toml");
+    println!("cargo:rerun-if-changed=libafl_libfuzzer_runtime/build.rs");
+
+    let custom_lib_dir =
+        PathBuf::from(std::env::var_os("OUT_DIR").unwrap()).join("libafl_libfuzzer");
+    std::fs::create_dir_all(&custom_lib_dir)
+        .expect("Couldn't create the output directory for the fuzzer runtime build");
+
+    let mut lib_src = PathBuf::from(std::env::var_os("CARGO_MANIFEST_DIR").unwrap());
+    lib_src.push("libafl_libfuzzer_runtime");
+
+    let mut command = Command::new(std::env::var_os("CARGO").unwrap());
+    command
+        .env_remove("RUSTFLAGS")
+        .env_remove("CARGO_ENCODED_RUSTFLAGS");
+
+    for (var, _) in std::env::vars() {
+        if var.starts_with("CARGO_PKG_") || var.starts_with("CARGO_FEATURE_") {
+            command.env_remove(var);
+        }
+    }
+
+    command
+        .env("PATH", std::env::var_os("PATH").unwrap())
+        .current_dir(&lib_src);
+
+    command.arg("build");
+
+    let mut features = vec!["serdeany_autoreg"];
+
+    if cfg!(any(feature = "fork")) {
+        features.push("fork");
+    }
+    if cfg!(any(feature = "introspection")) {
+        features.push("libafl/introspection");
+    }
+
+    command
+        .arg("--release")
+        .arg("--no-default-features")
+        .arg("--target-dir")
+        .arg(&custom_lib_dir)
+        .arg("--features")
+        .arg(features.join(","))
+        .arg("--target")
+        .arg(std::env::var_os("TARGET").unwrap());
+
+    assert!(
+        !command.status().map(|s| !s.success()).unwrap_or(true),
+        "Couldn't build runtime crate! Did you remember to use nightly?"
+    );
+
+    let mut lib_path = custom_lib_dir.join(std::env::var_os("TARGET").unwrap());
+    lib_path.push("release");
+    lib_path.push("libafl_libfuzzer_runtime.a");
+
+    // // TODO this is definitely not compat with macOS/Windows...
+    if cfg!(feature = "whole-archive") {
+        use std::path::Path;
+        let target_libdir = Command::new("rustc")
+            .args(["--print", "target-libdir"])
+            .output()
+            .expect("Couldn't find rustc's target-libdir");
+        let target_libdir = String::from_utf8(target_libdir.stdout).unwrap();
+        let target_libdir = Path::new(target_libdir.trim());
+
+        let rust_lld = target_libdir.join("../bin/rust-lld");
+        let rust_ar = target_libdir.join("../bin/llvm-ar"); // NOTE: depends on llvm-tools
+
+        let mut command = Command::new(rust_lld);
+        command
+            .args(["-flavor", "gnu"])
+            .arg("-r")
+            .arg("--whole-archive")
+            .arg(lib_path)
+            .args(["-o", custom_lib_dir.join("libFuzzer.o").to_str().expect("Invalid path characters present in your current directory prevent us from linking to the runtime")]);
+
+        assert!(
+            !command.status().map(|s| !s.success()).unwrap_or(true),
+            "Couldn't link runtime crate! Do you have the llvm-tools component installed?"
+        );
+
+        let mut command = Command::new(rust_ar);
+        command
+            .arg("cr")
+            .arg(custom_lib_dir.join("libFuzzer.a"))
+            .arg(custom_lib_dir.join("libFuzzer.o"));
+
+        assert!(
+            !command.status().map(|s| !s.success()).unwrap_or(true),
+            "Couldn't create runtime archive!"
+        );
+    } else {
+        std::fs::copy(lib_path, custom_lib_dir.join("libFuzzer.a")).unwrap();
+    }
+
+    println!(
+        "cargo:rustc-link-search=native={}",
+        custom_lib_dir.to_str().unwrap()
+    );
+    println!("cargo:rustc-link-lib=static=Fuzzer");
+    println!("cargo:rustc-link-lib=stdc++");
+}

libafl_libfuzzer/libafl_libfuzzer_runtime/Cargo.toml

@@ -0,0 +1,50 @@
+[package]
+name = "libafl_libfuzzer_runtime"
+version = "0.1.0"
+edition = "2021"
+publish = false
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[features]
+default = ["fork", "serdeany_autoreg"]
+fork = ["libafl/fork"] # Enables forking mode for the LibAFL launcher (instead of starting new processes)
+
+serdeany_autoreg = [] # TODO: drop this when fixed in libafl proper
+
+[profile.release]
+lto = true
+codegen-units = 1
+opt-level = 3
+debug = true
+
+
+[lib]
+name = "afl_libfuzzer_runtime" # TODO fix name once cargo-fuzz stops stripping double-prefixes
+path = "src/lib.rs"
+crate-type = ["staticlib", "rlib"]
+
+[dependencies]
+libafl = { path = "../../libafl", default-features = false, features = ["std", "derive", "llmp_compression", "rand_trait", "errors_backtrace", "regex", "serdeany_autoreg", "tui_monitor"] }
+libafl_bolts = { path = "../../libafl_bolts", default-features = false, features = ["std", "derive", "llmp_compression", "rand_trait", "errors_backtrace"] }
+libafl_targets = { path = "../../libafl_targets", features = ["sancov_8bit", "sancov_cmplog", "libfuzzer", "libfuzzer_oom", "libfuzzer_define_run_driver", "sanitizers_flags"] }
+
+ahash = { version = "0.8.3", default-features = false }
+libc = "0.2.139"
+log = "0.4.17"
+mimalloc = { version = "0.1.34", default-features = false, optional = true }
+num-traits = "0.2.15"
+rand = "0.8.5"
+serde = { version = "1.0", default-features = false, features = ["alloc", "derive"] } # serialization lib
+
+# clippy-suggested optimised byte counter
+bytecount = "0.6.3"
+
+# for identifying if we can grimoire-ify
+utf8-chars = "2.0.3"
+
+[build-dependencies]
+bindgen = "0.65.1"
+cc = { version = "1.0", features = ["parallel"] }
+
+[workspace]

libafl_libfuzzer/libafl_libfuzzer_runtime/build.rs

@@ -0,0 +1,24 @@
+use std::{env, path::Path};
+
+fn main() {
+    let out_dir = env::var_os("OUT_DIR").unwrap();
+
+    println!("cargo:rerun-if-changed=src/harness_wrap.h");
+    println!("cargo:rerun-if-changed=src/harness_wrap.cpp");
+
+    let build = bindgen::builder()
+        .header("src/harness_wrap.h")
+        .generate_comments(true)
+        .parse_callbacks(Box::new(bindgen::CargoCallbacks))
+        .generate()
+        .expect("Couldn't generate the harness wrapper!");
+
+    build
+        .write_to_file(Path::new(&out_dir).join("harness_wrap.rs"))
+        .expect("Couldn't write the harness wrapper!");
+
+    cc::Build::new()
+        .cpp(true)
+        .file("src/harness_wrap.cpp")
+        .compile("harness_wrap");
+}

libafl_libfuzzer/libafl_libfuzzer_runtime/src/feedbacks.rs

@@ -0,0 +1,181 @@
+use alloc::rc::Rc;
+use core::{cell::RefCell, fmt::Debug};
+use std::path::PathBuf;
+
+use libafl::{
+    alloc,
+    corpus::Testcase,
+    events::EventFirer,
+    executors::ExitKind,
+    feedbacks::{Feedback, MinMapFeedback},
+    inputs::{BytesInput, Input, UsesInput},
+    observers::ObserversTuple,
+    state::{HasClientPerfMonitor, HasMetadata},
+    Error,
+};
+use libafl_bolts::{impl_serdeany, Named};
+use libafl_targets::OomFeedback;
+use serde::{Deserialize, Serialize};
+
+use crate::{observers::MappedEdgeMapObserver, options::ArtifactPrefix};
+
+#[derive(Debug)]
+pub struct LibfuzzerKeepFeedback {
+    keep: Rc<RefCell<bool>>,
+}
+
+impl LibfuzzerKeepFeedback {
+    pub fn new() -> Self {
+        Self {
+            keep: Rc::new(RefCell::new(false)),
+        }
+    }
+
+    pub fn keep(&self) -> Rc<RefCell<bool>> {
+        self.keep.clone()
+    }
+}
+
+impl Named for LibfuzzerKeepFeedback {
+    fn name(&self) -> &str {
+        "libfuzzer-keep"
+    }
+}
+
+impl<S> Feedback<S> for LibfuzzerKeepFeedback
+where
+    S: UsesInput + HasClientPerfMonitor,
+{
+    fn is_interesting<EM, OT>(
+        &mut self,
+        _state: &mut S,
+        _manager: &mut EM,
+        _input: &S::Input,
+        _observers: &OT,
+        _exit_kind: &ExitKind,
+    ) -> Result<bool, Error>
+    where
+        EM: EventFirer<State = S>,
+        OT: ObserversTuple<S>,
+    {
+        Ok(*self.keep.borrow())
+    }
+}
+
+#[derive(Deserialize, Serialize, Debug)]
+pub struct LibfuzzerCrashCauseMetadata {
+    kind: ExitKind,
+}
+
+impl_serdeany!(LibfuzzerCrashCauseMetadata);
+
+impl LibfuzzerCrashCauseMetadata {
+    pub fn kind(&self) -> ExitKind {
+        self.kind
+    }
+}
+
+#[derive(Debug)]
+pub struct LibfuzzerCrashCauseFeedback {
+    artifact_prefix: Option<ArtifactPrefix>,
+    exit_kind: ExitKind,
+}
+
+impl LibfuzzerCrashCauseFeedback {
+    pub fn new(artifact_prefix: Option<ArtifactPrefix>) -> Self {
+        Self {
+            artifact_prefix,
+            exit_kind: ExitKind::Ok,
+        }
+    }
+}
+
+impl Named for LibfuzzerCrashCauseFeedback {
+    fn name(&self) -> &str {
+        "crash-cause"
+    }
+}
+
+impl LibfuzzerCrashCauseFeedback {
+    fn set_filename<I: Input>(&self, prefix: &str, testcase: &mut Testcase<I>) {
+        let base = if let Some(filename) = testcase.filename() {
+            filename.clone()
+        } else {
+            let name = testcase.input().as_ref().unwrap().generate_name(0);
+            name
+        };
+        let file_path = if let Some(artifact_prefix) = self.artifact_prefix.as_ref() {
+            if let Some(filename_prefix) = artifact_prefix.filename_prefix() {
+                artifact_prefix
+                    .dir()
+                    .join(format!("{filename_prefix}{prefix}-{base}"))
+            } else {
+                artifact_prefix.dir().join(format!("{prefix}-{base}"))
+            }
+        } else {
+            PathBuf::from(format!("{prefix}-{base}"))
+        };
+        *testcase.file_path_mut() = Some(file_path);
+    }
+}
+
+impl<S> Feedback<S> for LibfuzzerCrashCauseFeedback
+where
+    S: UsesInput<Input = BytesInput> + HasClientPerfMonitor,
+{
+    fn is_interesting<EM, OT>(
+        &mut self,
+        _state: &mut S,
+        _manager: &mut EM,
+        _input: &S::Input,
+        _observers: &OT,
+        exit_kind: &ExitKind,
+    ) -> Result<bool, Error>
+    where
+        EM: EventFirer<State = S>,
+        OT: ObserversTuple<S>,
+    {
+        self.exit_kind = *exit_kind;
+        Ok(false)
+    }
+
+    fn append_metadata<OT>(
+        &mut self,
+        _state: &mut S,
+        _observers: &OT,
+        testcase: &mut Testcase<S::Input>,
+    ) -> Result<(), Error>
+    where
+        OT: ObserversTuple<S>,
+    {
+        match self.exit_kind {
+            ExitKind::Crash | ExitKind::Oom if OomFeedback::oomed() => {
+                self.set_filename("oom", testcase);
+                testcase.add_metadata(LibfuzzerCrashCauseMetadata {
+                    kind: ExitKind::Oom,
+                });
+            }
+            ExitKind::Crash => {
+                self.set_filename("crash", testcase);
+                testcase.add_metadata(LibfuzzerCrashCauseMetadata {
+                    kind: ExitKind::Crash,
+                });
+            }
+            ExitKind::Timeout => {
+                self.set_filename("timeout", testcase);
+                testcase.add_metadata(LibfuzzerCrashCauseMetadata {
+                    kind: ExitKind::Timeout,
+                });
+            }
+            _ => {
+                self.set_filename("uncategorized", testcase);
+                testcase.add_metadata(LibfuzzerCrashCauseMetadata {
+                    kind: self.exit_kind,
+                });
+            }
+        }
+        Ok(())
+    }
+}
+
+pub type ShrinkMapFeedback<O, S, T> = MinMapFeedback<MappedEdgeMapObserver<O, T>, S, usize>;

libafl_libfuzzer/libafl_libfuzzer_runtime/src/fuzz.rs

@@ -0,0 +1,224 @@
+use core::ffi::c_int;
+use std::{
+    fmt::Debug,
+    fs::File,
+    net::TcpListener,
+    time::{SystemTime, UNIX_EPOCH},
+};
+#[cfg(unix)]
+use std::{
+    io::Write,
+    os::fd::{AsRawFd, FromRawFd, IntoRawFd},
+};
+
+use libafl::{
+    corpus::Corpus,
+    events::{
+        launcher::Launcher, EventConfig, ProgressReporter, SimpleEventManager,
+        SimpleRestartingEventManager,
+    },
+    executors::ExitKind,
+    inputs::UsesInput,
+    monitors::{
+        tui::{ui::TuiUI, TuiMonitor},
+        Monitor, MultiMonitor, SimpleMonitor,
+    },
+    stages::StagesTuple,
+    state::{
+        HasClientPerfMonitor, HasExecutions, HasLastReportTime, HasMetadata, HasSolutions,
+        UsesState,
+    },
+    Error, Fuzzer,
+};
+use libafl_bolts::{
+    core_affinity::Cores,
+    shmem::{ShMemProvider, StdShMemProvider},
+};
+
+use crate::{feedbacks::LibfuzzerCrashCauseMetadata, fuzz_with, options::LibfuzzerOptions};
+
+fn do_fuzz<F, ST, E, S, EM>(
+    options: &LibfuzzerOptions,
+    fuzzer: &mut F,
+    stages: &mut ST,
+    executor: &mut E,
+    state: &mut S,
+    mgr: &mut EM,
+) -> Result<(), Error>
+where
+    F: Fuzzer<E, EM, ST, State = S>,
+    S: HasClientPerfMonitor
+        + HasMetadata
+        + HasExecutions
+        + UsesInput
+        + HasSolutions
+        + HasLastReportTime,
+    E: UsesState<State = S>,
+    EM: ProgressReporter<State = S>,
+    ST: StagesTuple<E, EM, S, F>,
+{
+    if let Some(solution) = state.solutions().last() {
+        let kind = state
+            .solutions()
+            .get(solution)
+            .expect("Last solution was not available")
+            .borrow()
+            .metadata::<LibfuzzerCrashCauseMetadata>()
+            .expect("Crash cause not attached to solution")
+            .kind();
+        let mut halt = false;
+        match kind {
+            ExitKind::Oom if !options.ignore_ooms() => halt = true,
+            ExitKind::Crash if !options.ignore_crashes() => halt = true,
+            ExitKind::Timeout if !options.ignore_timeouts() => halt = true,
+            _ => {
+                log::info!("Ignoring {kind:?} according to requested ignore rules.");
+            }
+        }
+        if halt {
+            log::info!("Halting; the error on the next line is actually okay. :)");
+            return Err(Error::shutting_down());
+        }
+    }
+    fuzzer.fuzz_loop(stages, executor, state, mgr)?;
+    Ok(())
+}
+
+fn fuzz_single_forking<M>(
+    options: &LibfuzzerOptions,
+    harness: &extern "C" fn(*const u8, usize) -> c_int,
+    mut shmem_provider: StdShMemProvider,
+    monitor: M,
+) -> Result<(), Error>
+where
+    M: Monitor + Debug,
+{
+    fuzz_with!(options, harness, do_fuzz, |fuzz_single| {
+        let (state, mgr): (
+            Option<StdState<_, _, _, _>>,
+            SimpleRestartingEventManager<_, StdState<_, _, _, _>, _>,
+        ) = match SimpleRestartingEventManager::launch(monitor, &mut shmem_provider) {
+            // The restarting state will spawn the same process again as child, then restarted it each time it crashes.
+            Ok(res) => res,
+            Err(err) => match err {
+                Error::ShuttingDown => {
+                    return Ok(());
+                }
+                _ => {
+                    panic!("Failed to setup the restarter: {err}");
+                }
+            },
+        };
+        #[cfg(unix)]
+        {
+            if options.close_fd_mask() != 0 {
+                let file_null = File::open("/dev/null")?;
+                unsafe {
+                    if options.close_fd_mask() & 1 != 0 {
+                        libc::dup2(file_null.as_raw_fd(), 1);
+                    }
+                    if options.close_fd_mask() & 2 != 0 {
+                        libc::dup2(file_null.as_raw_fd(), 2);
+                    }
+                }
+            }
+        }
+        crate::start_fuzzing_single(fuzz_single, state, mgr)
+    })
+}
+
+fn fuzz_many_forking<M>(
+    options: &LibfuzzerOptions,
+    harness: &extern "C" fn(*const u8, usize) -> c_int,
+    shmem_provider: StdShMemProvider,
+    forks: usize,
+    monitor: M,
+) -> Result<(), Error>
+where
+    M: Monitor + Clone + Debug,
+{
+    fuzz_with!(options, harness, do_fuzz, |mut run_client| {
+        let cores = Cores::from((0..forks).collect::<Vec<_>>());
+        let broker_port = TcpListener::bind("127.0.0.1:0")?
+            .local_addr()
+            .unwrap()
+            .port();
+
+        match Launcher::builder()
+            .shmem_provider(shmem_provider)
+            .configuration(EventConfig::from_name(options.fuzzer_name()))
+            .monitor(monitor)
+            .run_client(&mut run_client)
+            .cores(&cores)
+            .broker_port(broker_port)
+            // TODO .remote_broker_addr(opt.remote_broker_addr)
+            .stdout_file(Some("/dev/null"))
+            .build()
+            .launch()
+        {
+            Ok(()) => (),
+            Err(Error::ShuttingDown) => println!("Fuzzing stopped by user. Good bye."),
+            res @ Err(_) => return res,
+        }
+        Ok(())
+    })
+}
+
+pub fn fuzz(
+    options: &LibfuzzerOptions,
+    harness: &extern "C" fn(*const u8, usize) -> c_int,
+) -> Result<(), Error> {
+    if let Some(forks) = options.forks() {
+        let shmem_provider = StdShMemProvider::new().expect("Failed to init shared memory");
+        if options.tui() {
+            let monitor = TuiMonitor::new(TuiUI::new(options.fuzzer_name().to_string(), true));
+            fuzz_many_forking(options, harness, shmem_provider, forks, monitor)
+        } else if forks == 1 {
+            #[cfg(unix)]
+            let mut stderr = unsafe {
+                let new_fd = libc::dup(std::io::stderr().as_raw_fd());
+                File::from_raw_fd(new_fd)
+            };
+            let monitor = MultiMonitor::with_time(
+                move |s| {
+                    #[cfg(unix)]
+                    writeln!(stderr, "{s}").expect("Could not write to stderr???");
+                    #[cfg(not(unix))]
+                    eprintln!("{s}");
+                },
+                SystemTime::now().duration_since(UNIX_EPOCH).unwrap(),
+            );
+            fuzz_single_forking(options, harness, shmem_provider, monitor)
+        } else {
+            #[cfg(unix)]
+            let stderr_fd = unsafe { libc::dup(std::io::stderr().as_raw_fd()) };
+            let monitor = MultiMonitor::with_time(
+                move |s| {
+                    #[cfg(unix)]
+                    {
+                        // unfortunate requirement to meet Clone... thankfully, this does not
+                        // generate effectively any overhead (no allocations, calls get merged)
+                        let mut stderr = unsafe { File::from_raw_fd(stderr_fd) };
+                        writeln!(stderr, "{s}").expect("Could not write to stderr???");
+                        let _ = stderr.into_raw_fd(); // discard the file without closing
+                    }
+                    #[cfg(not(unix))]
+                    eprintln!("{s}");
+                },
+                SystemTime::now().duration_since(UNIX_EPOCH).unwrap(),
+            );
+            fuzz_many_forking(options, harness, shmem_provider, forks, monitor)
+        }
+    } else if options.tui() {
+        // if the user specifies TUI, we assume they want to fork; it would not be possible to use
+        // TUI safely otherwise
+        let shmem_provider = StdShMemProvider::new().expect("Failed to init shared memory");
+        let monitor = TuiMonitor::new(TuiUI::new(options.fuzzer_name().to_string(), true));
+        fuzz_many_forking(options, harness, shmem_provider, 1, monitor)
+    } else {
+        fuzz_with!(options, harness, do_fuzz, |fuzz_single| {
+            let mgr = SimpleEventManager::new(SimpleMonitor::new(|s| eprintln!("{s}")));
+            crate::start_fuzzing_single(fuzz_single, None, mgr)
+        })
+    }
+}

libafl_libfuzzer/libafl_libfuzzer_runtime/src/harness_wrap.cpp

@@ -0,0 +1,10 @@
+#include "harness_wrap.h"
+
+extern "C" int libafl_libfuzzer_test_one_input(
+    int (*harness)(const uint8_t *, size_t), const uint8_t *data, size_t len) {
+  try {
+    return harness(data, len);
+  } catch (...) {
+    return -2;  // custom code for "we died!"
+  }
+}

libafl_libfuzzer/libafl_libfuzzer_runtime/src/harness_wrap.h

@@ -0,0 +1,15 @@
+#pragma once
+
+#include <stddef.h>
+#include <stdint.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+int libafl_libfuzzer_test_one_input(int (*harness)(const uint8_t *, size_t),
+                                    const uint8_t *data, size_t len);
+
+#ifdef __cplusplus
+}
+#endif

libafl_libfuzzer/libafl_libfuzzer_runtime/src/lib.rs

@@ -0,0 +1,599 @@
+//! The `LibAFL` `LibFuzzer` runtime, exposing the same functions as the original [`LibFuzzer`](https://llvm.org/docs/LibFuzzer.html).
+
+#![allow(incomplete_features)]
+// For `type_eq`
+#![cfg_attr(unstable_feature, feature(specialization))]
+// For `type_id` and owned things
+#![cfg_attr(unstable_feature, feature(intrinsics))]
+// For `std::simd`
+#![cfg_attr(unstable_feature, feature(portable_simd))]
+#![warn(clippy::cargo)]
+#![allow(ambiguous_glob_reexports)]
+#![deny(clippy::cargo_common_metadata)]
+#![deny(rustdoc::broken_intra_doc_links)]
+#![deny(clippy::all)]
+#![deny(clippy::pedantic)]
+#![allow(
+    clippy::unreadable_literal,
+    clippy::type_repetition_in_bounds,
+    clippy::missing_errors_doc,
+    clippy::cast_possible_truncation,
+    clippy::used_underscore_binding,
+    clippy::ptr_as_ptr,
+    clippy::missing_panics_doc,
+    clippy::missing_docs_in_private_items,
+    clippy::module_name_repetitions,
+    clippy::ptr_cast_constness,
+    clippy::unsafe_derive_deserialize
+)]
+#![cfg_attr(not(test), warn(
+missing_debug_implementations,
+missing_docs,
+//trivial_casts,
+trivial_numeric_casts,
+unused_extern_crates,
+unused_import_braces,
+unused_qualifications,
+//unused_results
+))]
+#![cfg_attr(test, deny(
+missing_debug_implementations,
+missing_docs,
+//trivial_casts,
+trivial_numeric_casts,
+unused_extern_crates,
+unused_import_braces,
+unused_qualifications,
+unused_must_use,
+//unused_results
+))]
+#![cfg_attr(
+    test,
+    deny(
+        bad_style,
+        dead_code,
+        improper_ctypes,
+        non_shorthand_field_patterns,
+        no_mangle_generic_items,
+        overflowing_literals,
+        path_statements,
+        patterns_in_fns_without_body,
+        private_in_public,
+        unconditional_recursion,
+        unused,
+        unused_allocation,
+        unused_comparisons,
+        unused_parens,
+        while_true
+    )
+)]
+// Till they fix this buggy lint in clippy
+#![allow(clippy::borrow_as_ptr)]
+#![allow(clippy::borrow_deref_ref)]
+
+use core::ffi::{c_char, c_int, CStr};
+
+use libafl::{
+    inputs::{BytesInput, HasTargetBytes, Input},
+    Error,
+};
+use libafl_bolts::AsSlice;
+
+use crate::options::{LibfuzzerMode, LibfuzzerOptions};
+
+#[cfg(not(feature = "serdeany_autoreg"))]
+compile_error!("serdeany_autoreg feature must be enabled.");
+
+mod feedbacks;
+mod fuzz;
+mod merge;
+mod misc;
+mod observers;
+mod options;
+mod report;
+mod schedulers;
+mod tmin;
+
+mod harness_wrap {
+    #![allow(non_snake_case)]
+    #![allow(non_camel_case_types)]
+    #![allow(non_upper_case_globals)]
+    #![allow(unused)]
+    #![allow(improper_ctypes)]
+    #![allow(clippy::unreadable_literal)]
+    #![allow(missing_docs)]
+    include!(concat!(env!("OUT_DIR"), "/harness_wrap.rs"));
+}
+
+pub(crate) use harness_wrap::libafl_libfuzzer_test_one_input;
+#[cfg(feature = "mimalloc")]
+use mimalloc::MiMalloc;
+#[global_allocator]
+#[cfg(feature = "mimalloc")]
+static GLOBAL: MiMalloc = MiMalloc;
+
+static mut BACKTRACE: Option<u64> = None;
+
+#[allow(clippy::struct_excessive_bools)]
+struct CustomMutationStatus {
+    std_mutational: bool,
+    std_no_mutate: bool,
+    std_no_crossover: bool,
+    custom_mutation: bool,
+    custom_crossover: bool,
+}
+
+impl CustomMutationStatus {
+    fn new() -> Self {
+        let custom_mutation = libafl_targets::libfuzzer::has_custom_mutator();
+        let custom_crossover = libafl_targets::libfuzzer::has_custom_crossover();
+
+        // we use all libafl mutations
+        let std_mutational = !(custom_mutation || custom_crossover);
+        // we use libafl crossover, but not libafl mutations
+        let std_no_mutate = !std_mutational && custom_mutation && !custom_crossover;
+        // we use libafl mutations, but not libafl crossover
+        let std_no_crossover = !std_mutational && !custom_mutation && custom_crossover;
+
+        Self {
+            std_mutational,
+            std_no_mutate,
+            std_no_crossover,
+            custom_mutation,
+            custom_crossover,
+        }
+    }
+}
+
+macro_rules! fuzz_with {
+    ($options:ident, $harness:ident, $operation:expr, $and_then:expr, $edge_maker:expr) => {{
+        use libafl_bolts::{
+                current_nanos,
+                rands::StdRand,
+                tuples::{Merge, tuple_list},
+                AsSlice,
+        };
+        use libafl::{
+            corpus::{CachedOnDiskCorpus, Corpus, OnDiskCorpus},
+            executors::{ExitKind, InProcessExecutor, TimeoutExecutor},
+            feedback_and_fast, feedback_not, feedback_or, feedback_or_fast,
+            feedbacks::{ConstFeedback, CrashFeedback, MaxMapFeedback, NewHashFeedback, TimeFeedback, TimeoutFeedback},
+            generators::RandBytesGenerator,
+            inputs::{BytesInput, HasTargetBytes},
+            mutators::{
+                GrimoireExtensionMutator, GrimoireRecursiveReplacementMutator, GrimoireRandomDeleteMutator,
+                GrimoireStringReplacementMutator, havoc_crossover, havoc_mutations, havoc_mutations_no_crossover,
+                I2SRandReplace, StdScheduledMutator, Tokens, tokens_mutations
+            },
+            observers::{stacktrace::BacktraceObserver, TimeObserver},
+            schedulers::{
+                IndexesLenTimeMinimizerScheduler, powersched::PowerSchedule, PowerQueueScheduler,
+            },
+            stages::{
+                CalibrationStage, GeneralizationStage, IfStage, StdMutationalStage,
+                StdPowerMutationalStage, TracingStage,
+            },
+            state::{HasCorpus, StdState},
+            StdFuzzer,
+        };
+        use libafl_targets::{CmpLogObserver, LLVMCustomMutator, OomFeedback, OomObserver};
+        use rand::{thread_rng, RngCore};
+        use std::{env::temp_dir, fs::create_dir, path::PathBuf};
+
+        use crate::{BACKTRACE, CustomMutationStatus};
+        use crate::feedbacks::{LibfuzzerCrashCauseFeedback, LibfuzzerKeepFeedback, ShrinkMapFeedback};
+        use crate::misc::should_use_grimoire;
+        use crate::observers::{MappedEdgeMapObserver, SizeValueObserver};
+
+        let edge_maker = &$edge_maker;
+
+        let closure = |mut state: Option<_>, mut mgr, _cpu_id| {
+            let mutator_status = CustomMutationStatus::new();
+            let grimoire_metadata = should_use_grimoire(&mut state, &$options, &mutator_status)?;
+            let grimoire = grimoire_metadata.should();
+
+            let edges_observer = edge_maker();
+            let size_edges_observer = MappedEdgeMapObserver::new(edge_maker(), SizeValueObserver::default());
+
+            let keep_observer = LibfuzzerKeepFeedback::new();
+            let keep = keep_observer.keep();
+
+            // Create an observation channel to keep track of the execution time
+            let time_observer = TimeObserver::new("time");
+
+            // Create an OOM observer to monitor if an OOM has occurred
+            let oom_observer = OomObserver::new($options.rss_limit(), $options.malloc_limit());
+
+            // Create the Cmp observer
+            let cmplog_observer = CmpLogObserver::new("cmplog", true);
+
+            // Create a stacktrace observer
+            let backtrace_observer = BacktraceObserver::new(
+                "BacktraceObserver",
+                unsafe { &mut BACKTRACE },
+                libafl::observers::HarnessType::InProcess,
+            );
+
+            // New maximization map feedback linked to the edges observer
+            let map_feedback = MaxMapFeedback::tracking(&edges_observer, true, true);
+            let shrinking_map_feedback = ShrinkMapFeedback::tracking(&size_edges_observer, false, false);
+
+            // Set up a generalization stage for grimoire
+            let generalization = GeneralizationStage::new(&edges_observer);
+            let generalization = IfStage::new(|_, _, _, _, _| Ok(grimoire.into()), (generalization, ()));
+
+            let calibration = CalibrationStage::new(&map_feedback);
+
+            // Feedback to rate the interestingness of an input
+            // This one is composed by two Feedbacks in OR
+            let mut feedback = feedback_and_fast!(
+                feedback_not!(
+                    feedback_or_fast!(
+                        OomFeedback,
+                        CrashFeedback::new(),
+                        TimeoutFeedback::new()
+                    )
+                ),
+                keep_observer,
+                feedback_or!(
+                    map_feedback,
+                    feedback_and_fast!(ConstFeedback::new($options.shrink()), shrinking_map_feedback),
+                    // Time feedback, this one does not need a feedback state
+                    TimeFeedback::with_observer(&time_observer)
+                )
+            );
+
+            // A feedback to choose if an input is a solution or not
+            let mut objective = feedback_or_fast!(
+                LibfuzzerCrashCauseFeedback::new($options.artifact_prefix().cloned()),
+                OomFeedback,
+                feedback_and_fast!(
+                    CrashFeedback::new(),
+                    feedback_or_fast!(ConstFeedback::new(!$options.dedup()), NewHashFeedback::new(&backtrace_observer))
+                ),
+                TimeoutFeedback::new()
+            );
+
+            let corpus_dir = if let Some(main) = $options.dirs().first() {
+                main.clone()
+            } else {
+                let mut rng = thread_rng();
+                let mut dir = PathBuf::new();
+                let mut last = Ok(());
+                for _ in 0..8 {
+                    dir = temp_dir().join(format!("libafl-corpus-{}", rng.next_u64()));
+                    last = create_dir(&dir);
+                    if last.is_ok() {
+                        break;
+                    }
+                }
+                last?;
+                dir
+            };
+
+            let crash_corpus = if let Some(prefix) = $options.artifact_prefix() {
+                OnDiskCorpus::with_meta_format_and_prefix(prefix.dir(), None, prefix.filename_prefix().clone(), false)
+                    .unwrap()
+            } else {
+                OnDiskCorpus::with_meta_format_and_prefix(&std::env::current_dir().unwrap(), None, None, false)
+                    .unwrap()
+            };
+
+            // If not restarting, create a State from scratch
+            let mut state = state.unwrap_or_else(|| {
+                StdState::new(
+                    // RNG
+                    StdRand::with_seed(current_nanos()),
+                    // Corpus that will be evolved, we keep it in memory for performance
+                    CachedOnDiskCorpus::with_meta_format_and_prefix(corpus_dir.clone(), 4096, None, None, true).unwrap(),
+                    // Corpus in which we store solutions (crashes in this example),
+                    // on disk so the user can get them after stopping the fuzzer
+                    crash_corpus,
+                    // A reference to the feedbacks, to create their feedback state
+                    &mut feedback,
+                    // A reference to the objectives, to create their objective state
+                    &mut objective,
+                )
+                .expect("Failed to create state")
+            });
+            state.metadata_map_mut().insert_boxed(grimoire_metadata);
+
+            // Attempt to use tokens from libfuzzer dicts
+            if !state.has_metadata::<Tokens>() {
+                let mut toks = if let Some(tokens) = $options.dict() {
+                    tokens.clone()
+                } else {
+                    Tokens::default()
+                };
+                #[cfg(any(target_os = "linux", target_vendor = "apple"))]
+                {
+                    toks += libafl_targets::autotokens()?;
+                }
+
+                if !toks.is_empty() {
+                    state.add_metadata(toks);
+                }
+            }
+
+            // Setup a randomic Input2State stage, conditionally within a custom mutator
+            let i2s =
+                StdMutationalStage::new(StdScheduledMutator::new(tuple_list!(I2SRandReplace::new())));
+            let i2s = IfStage::new(|_, _, _, _, _| Ok((!mutator_status.custom_mutation).into()), (i2s, ()));
+            let cm_i2s = StdMutationalStage::new(unsafe {
+                LLVMCustomMutator::mutate_unchecked(StdScheduledMutator::new(tuple_list!(
+                    I2SRandReplace::new()
+                )))
+            });
+            let cm_i2s = IfStage::new(|_, _, _, _, _| Ok(mutator_status.custom_mutation.into()), (cm_i2s, ()));
+
+            // TODO configure with mutation stacking options from libfuzzer
+            let std_mutator = StdScheduledMutator::new(havoc_mutations().merge(tokens_mutations()));
+
+            let std_power = StdPowerMutationalStage::new(std_mutator);
+            let std_power = IfStage::new(|_, _, _, _, _| Ok(mutator_status.std_mutational.into()), (std_power, ()));
+
+            // for custom mutator and crossover, each have access to the LLVMFuzzerMutate -- but it appears
+            // that this method doesn't normally offer stacked mutations where one may expect them
+            // we offer stacked mutations since this appears to be expected; see:
+            // https://github.com/google/fuzzing/blob/bb05211c12328cb16327bb0d58c0c67a9a44576f/docs/structure-aware-fuzzing.md#example-compression
+            // additionally, we perform mutation and crossover in two separate stages due to possible
+            // errors introduced by incorrectly handling custom mutations; see explanation below
+
+            // a custom mutator is defined
+            // note: in libfuzzer, crossover is enabled by default, but this appears to be unintended
+            // and erroneous if custom mutators are defined as it inserts bytes from other test cases
+            // without performing the custom mutator's preprocessing beforehand
+            // we opt not to use crossover in the LLVMFuzzerMutate and instead have a second crossover pass,
+            // though it is likely an error for fuzzers to provide custom mutators but not custom crossovers
+            let custom_mutator = unsafe {
+                LLVMCustomMutator::mutate_unchecked(StdScheduledMutator::new(havoc_mutations_no_crossover().merge(tokens_mutations())))
+            };
+            let std_mutator_no_mutate = StdScheduledMutator::with_max_stack_pow(havoc_crossover(), 3);
+
+            let cm_power = StdPowerMutationalStage::new(custom_mutator);
+            let cm_power = IfStage::new(|_, _, _, _, _| Ok(mutator_status.custom_mutation.into()), (cm_power, ()));
+            let cm_std_power = StdMutationalStage::new(std_mutator_no_mutate);
+            let cm_std_power =
+                IfStage::new(|_, _, _, _, _| Ok(mutator_status.std_no_mutate.into()), (cm_std_power, ()));
+
+            // a custom crossover is defined
+            // while the scenario that a custom crossover is defined without a custom mutator is unlikely
+            // we handle it here explicitly anyways
+            let custom_crossover = unsafe {
+                LLVMCustomMutator::crossover_unchecked(StdScheduledMutator::with_max_stack_pow(
+                    havoc_mutations_no_crossover().merge(tokens_mutations()),
+                    3,
+                ))
+            };
+            let std_mutator_no_crossover = StdScheduledMutator::new(havoc_mutations_no_crossover().merge(tokens_mutations()));
+
+            let cc_power = StdMutationalStage::new(custom_crossover);
+            let cc_power = IfStage::new(|_, _, _, _, _| Ok(mutator_status.custom_crossover.into()), (cc_power, ()));
+            let cc_std_power = StdPowerMutationalStage::new(std_mutator_no_crossover);
+            let cc_std_power =
+                IfStage::new(|_, _, _, _, _| Ok(mutator_status.std_no_crossover.into()), (cc_std_power, ()));
+
+            let grimoire_mutator = StdScheduledMutator::with_max_stack_pow(
+                tuple_list!(
+                    GrimoireExtensionMutator::new(),
+                    GrimoireRecursiveReplacementMutator::new(),
+                    GrimoireStringReplacementMutator::new(),
+                    // give more probability to avoid large inputs
+                    GrimoireRandomDeleteMutator::new(),
+                    GrimoireRandomDeleteMutator::new(),
+                ),
+                3,
+            );
+            let grimoire = IfStage::new(|_, _, _, _, _| Ok(grimoire.into()), (StdMutationalStage::transforming(grimoire_mutator), ()));
+
+            // A minimization+queue policy to get testcasess from the corpus
+            let scheduler = IndexesLenTimeMinimizerScheduler::new(PowerQueueScheduler::new(&mut state, &edges_observer, PowerSchedule::FAST));
+
+            // A fuzzer with feedbacks and a corpus scheduler
+            let mut fuzzer = StdFuzzer::new(scheduler, feedback, objective);
+
+            // The wrapped harness function, calling out to the LLVM-style harness
+            let mut harness = |input: &BytesInput| {
+                let target = input.target_bytes();
+                let buf = target.as_slice();
+
+                let result = unsafe { crate::libafl_libfuzzer_test_one_input(Some(*$harness), buf.as_ptr(), buf.len()) };
+                match result {
+                    -2 => ExitKind::Crash,
+                    _ => {
+                        *keep.borrow_mut() = result == 0;
+                        ExitKind::Ok
+                    }
+                }
+            };
+
+            let mut tracing_harness = harness;
+
+            // Create the executor for an in-process function with one observer for edge coverage and one for the execution time
+            let mut executor = TimeoutExecutor::new(
+                InProcessExecutor::new(
+                    &mut harness,
+                    tuple_list!(edges_observer, size_edges_observer, time_observer, backtrace_observer, oom_observer),
+                    &mut fuzzer,
+                    &mut state,
+                    &mut mgr,
+                )?,
+                $options.timeout(),
+            );
+
+            // In case the corpus is empty (on first run) or crashed while loading, reset
+            if state.must_load_initial_inputs() {
+                if !$options.dirs().is_empty() {
+                    // Load from disk
+                    state
+                        .load_initial_inputs_forced(&mut fuzzer, &mut executor, &mut mgr, $options.dirs())
+                        .unwrap_or_else(|e| {
+                            panic!("Failed to load initial corpus at {:?}: {}", $options.dirs(), e)
+                        });
+                    println!("We imported {} inputs from disk.", state.corpus().count());
+                }
+                if state.corpus().count() < 1 {
+                    // Generator of bytearrays of max size 64
+                    let mut generator = RandBytesGenerator::from(RandBytesGenerator::new(64));
+
+                    // Generate 1024 initial inputs
+                    state
+                        .generate_initial_inputs(
+                            &mut fuzzer,
+                            &mut executor,
+                            &mut generator,
+                            &mut mgr,
+                            1 << 10,
+                        )
+                        .expect("Failed to generate the initial corpus");
+                    println!(
+                        "We imported {} inputs from the generator.",
+                        state.corpus().count()
+                    );
+                }
+            }
+
+
+            // Setup a tracing stage in which we log comparisons
+            let tracing = IfStage::new(|_, _, _, _, _| Ok(!$options.skip_tracing()), (TracingStage::new(InProcessExecutor::new(
+                &mut tracing_harness,
+                tuple_list!(cmplog_observer),
+                &mut fuzzer,
+                &mut state,
+                &mut mgr,
+            )?), ()));
+
+            // The order of the stages matter!
+            let mut stages = tuple_list!(
+                calibration,
+                generalization,
+                tracing,
+                i2s,
+                cm_i2s,
+                std_power,
+                cm_power,
+                cm_std_power,
+                cc_std_power,
+                cc_power,
+                grimoire,
+            );
+
+            #[allow(clippy::unnecessary_mut_passed)] // the functions may not require these many `mut`s
+            $operation(&$options, &mut fuzzer, &mut stages, &mut executor, &mut state, &mut mgr)
+        };
+
+        #[allow(clippy::redundant_closure_call)]
+        $and_then(closure)
+    }};
+
+    ($options:ident, $harness:ident, $operation:expr, $and_then:expr) => {{
+        use libafl::observers::{
+            HitcountsIterableMapObserver, HitcountsMapObserver, MultiMapObserver, StdMapObserver,
+        };
+        use libafl_targets::{COUNTERS_MAPS, extra_counters};
+
+        // Create an observation channel using the coverage map
+        if unsafe { COUNTERS_MAPS.len() } == 1 {
+            fuzz_with!($options, $harness, $operation, $and_then, || {
+                let edges = unsafe { extra_counters() };
+                let edges_observer =
+                    HitcountsMapObserver::new(StdMapObserver::from_mut_slice("edges", edges.into_iter().next().unwrap()));
+                edges_observer
+            })
+        } else if unsafe { COUNTERS_MAPS.len() } > 1 {
+            fuzz_with!($options, $harness, $operation, $and_then, || {
+                let edges = unsafe { extra_counters() };
+                let edges_observer =
+                    HitcountsIterableMapObserver::new(MultiMapObserver::new("edges", edges));
+                edges_observer
+            })
+        } else {
+            panic!("No maps available; cannot fuzz!")
+        }
+    }};
+}
+
+pub(crate) use fuzz_with;
+
+/// Starts to fuzz on a single node
+pub fn start_fuzzing_single<F, S, EM>(
+    mut fuzz_single: F,
+    initial_state: Option<S>,
+    mgr: EM,
+) -> Result<(), Error>
+where
+    F: FnMut(Option<S>, EM, usize) -> Result<(), Error>,
+{
+    fuzz_single(initial_state, mgr, 0)
+}
+
+extern "C" {
+    // redeclaration against libafl_targets because the pointers in our case may be mutable
+    fn libafl_targets_libfuzzer_init(argc: *mut c_int, argv: *mut *mut *const c_char) -> i32;
+}
+
+/// A method to start the fuzzer at a later point in time from a library.
+/// To quote the `libfuzzer` docs:
+/// > when it’s ready to start fuzzing, it can call `LLVMFuzzerRunDriver`, passing in the program arguments and a callback. This callback is invoked just like `LLVMFuzzerTestOneInput`, and has the same signature.
+///
+/// # Safety
+/// Will dereference all parameters.
+/// This will then call the (potentially unsafe) harness.
+/// The fuzzer itself should catch any side effects and, hence be reasonably safe, if the `harness_fn` parameter is correct.
+#[allow(non_snake_case, clippy::similar_names, clippy::missing_safety_doc)]
+#[no_mangle]
+pub unsafe extern "C" fn LLVMFuzzerRunDriver(
+    argc: *mut c_int,
+    argv: *mut *mut *const c_char,
+    harness_fn: Option<extern "C" fn(*const u8, usize) -> c_int>,
+) -> c_int {
+    let harness = harness_fn
+        .as_ref()
+        .expect("Illegal harness provided to libafl.");
+
+    // it appears that no one, not even libfuzzer, uses this return value
+    // https://github.com/llvm/llvm-project/blob/llvmorg-15.0.7/compiler-rt/lib/fuzzer/FuzzerDriver.cpp#L648
+    libafl_targets_libfuzzer_init(argc, argv);
+
+    let argc = unsafe { *argc } as isize;
+    let argv = unsafe { *argv };
+
+    let options = LibfuzzerOptions::new(
+        (0..argc)
+            .map(|i| unsafe { *argv.offset(i) })
+            .map(|cstr| unsafe { CStr::from_ptr(cstr) })
+            .map(|cstr| cstr.to_str().unwrap()),
+    )
+    .unwrap();
+
+    if !options.unknown().is_empty() {
+        println!("Unrecognised options: {:?}", options.unknown());
+    }
+
+    if *options.mode() != LibfuzzerMode::Tmin
+        && !options.dirs().is_empty()
+        && options.dirs().iter().all(|maybe_dir| maybe_dir.is_file())
+    {
+        // we've been requested to just run some inputs. Do so.
+        for input in options.dirs() {
+            let input = BytesInput::from_file(input).unwrap_or_else(|_| {
+                panic!("Couldn't load input {}", input.to_string_lossy().as_ref())
+            });
+            libafl_targets::libfuzzer::libfuzzer_test_one_input(input.target_bytes().as_slice());
+        }
+        return 0;
+    }
+    let res = match options.mode() {
+        LibfuzzerMode::Fuzz => fuzz::fuzz(&options, harness),
+        LibfuzzerMode::Merge => merge::merge(&options, harness),
+        LibfuzzerMode::Tmin => tmin::minimize_crash(&options, *harness),
+        LibfuzzerMode::Report => report::report(&options, harness),
+    };
+    match res {
+        Ok(()) | Err(Error::ShuttingDown) => 0,
+        Err(err) => {
+            eprintln!("Encountered error while performing libfuzzer shimming: {err}");
+            1
+        }
+    }
+}

libafl_libfuzzer/libafl_libfuzzer_runtime/src/merge.rs

@@ -0,0 +1,278 @@
+use std::{
+    env::temp_dir,
+    ffi::c_int,
+    fs::{rename, File},
+    io::Write,
+    os::fd::{AsRawFd, FromRawFd},
+    time::{SystemTime, UNIX_EPOCH},
+};
+
+use libafl::{
+    corpus::{Corpus, OnDiskCorpus},
+    events::{EventRestarter, SimpleRestartingEventManager},
+    executors::{ExitKind, InProcessExecutor, TimeoutExecutor},
+    feedback_and_fast, feedback_or_fast,
+    feedbacks::{CrashFeedback, MinMapFeedback, TimeoutFeedback},
+    inputs::{BytesInput, HasTargetBytes},
+    monitors::MultiMonitor,
+    observers::{MultiMapObserver, TimeObserver},
+    schedulers::RemovableScheduler,
+    state::{HasCorpus, HasRand, StdState},
+    Error, HasScheduler, StdFuzzer,
+};
+use libafl_bolts::{
+    rands::{Rand, RandomSeed, StdRand},
+    shmem::{ShMemProvider, StdShMemProvider},
+    tuples::tuple_list,
+    AsSlice,
+};
+use libafl_targets::{OomFeedback, OomObserver, COUNTERS_MAPS};
+
+use crate::{
+    feedbacks::{LibfuzzerCrashCauseFeedback, LibfuzzerKeepFeedback},
+    observers::{MappedEdgeMapObserver, SizeTimeValueObserver},
+    options::LibfuzzerOptions,
+    schedulers::MergeScheduler,
+};
+
+#[allow(clippy::too_many_lines)]
+pub fn merge(
+    options: &LibfuzzerOptions,
+    harness: &extern "C" fn(*const u8, usize) -> c_int,
+) -> Result<(), Error> {
+    if options.dirs().is_empty() {
+        return Err(Error::illegal_argument("Missing corpora to minimize; you should provide one directory to minimize into and one-to-many from which the inputs are loaded."));
+    }
+
+    let crash_corpus = if let Some(prefix) = options.artifact_prefix() {
+        OnDiskCorpus::with_meta_format_and_prefix(
+            prefix.dir(),
+            None,
+            prefix.filename_prefix().clone(),
+            true,
+        )
+        .unwrap()
+    } else {
+        OnDiskCorpus::with_meta_format_and_prefix(
+            &std::env::current_dir().unwrap(),
+            None,
+            None,
+            true,
+        )
+        .unwrap()
+    };
+
+    let keep_observer = LibfuzzerKeepFeedback::new();
+    let keep = keep_observer.keep();
+
+    let mut shmem_provider = StdShMemProvider::new().unwrap();
+
+    #[cfg(unix)]
+    let mut stderr = unsafe {
+        let new_fd = libc::dup(std::io::stderr().as_raw_fd());
+        File::from_raw_fd(new_fd)
+    };
+    let monitor = MultiMonitor::with_time(
+        move |s| {
+            #[cfg(unix)]
+            writeln!(stderr, "{s}").expect("Could not write to stderr???");
+            #[cfg(not(unix))]
+            eprintln!("{s}");
+        },
+        SystemTime::now().duration_since(UNIX_EPOCH).unwrap(),
+    );
+
+    let (state, mut mgr): (
+        Option<StdState<_, _, _, _>>,
+        SimpleRestartingEventManager<_, StdState<_, _, _, _>, _>,
+    ) = match SimpleRestartingEventManager::launch(monitor, &mut shmem_provider) {
+        // The restarting state will spawn the same process again as child, then restarted it each time it crashes.
+        Ok(res) => res,
+        Err(err) => match err {
+            Error::ShuttingDown => {
+                return Ok(());
+            }
+            _ => {
+                panic!("Failed to setup the restarter: {err}");
+            }
+        },
+    };
+    #[cfg(unix)]
+    {
+        if options.close_fd_mask() != 0 {
+            let file_null = File::open("/dev/null")?;
+            unsafe {
+                if options.close_fd_mask() & 1 != 0 {
+                    libc::dup2(file_null.as_raw_fd(), 1);
+                }
+                if options.close_fd_mask() & 2 != 0 {
+                    libc::dup2(file_null.as_raw_fd(), 2);
+                }
+            }
+        }
+    }
+
+    let edges = unsafe { core::mem::take(&mut COUNTERS_MAPS) };
+    let edges_observer = MultiMapObserver::new("edges", edges);
+
+    let time = TimeObserver::new("time");
+    let edges_observer =
+        MappedEdgeMapObserver::new(edges_observer, SizeTimeValueObserver::new(time));
+
+    let map_feedback = MinMapFeedback::tracking(&edges_observer, false, true);
+
+    // Create an OOM observer to monitor if an OOM has occurred
+    let oom_observer = OomObserver::new(options.rss_limit(), options.malloc_limit());
+
+    // Feedback to rate the interestingness of an input
+    // This one is composed by two Feedbacks in OR
+    let mut feedback = feedback_and_fast!(keep_observer, map_feedback);
+
+    // A feedback to choose if an input is a solution or not
+    let mut objective = feedback_or_fast!(
+        LibfuzzerCrashCauseFeedback::new(options.artifact_prefix().cloned()),
+        OomFeedback,
+        CrashFeedback::new(),
+        TimeoutFeedback::new()
+    );
+
+    let observers = tuple_list!(edges_observer, oom_observer);
+
+    // scheduler doesn't really matter here
+    let scheduler = MergeScheduler::new();
+
+    let mut state = state.map_or_else(|| {
+        let mut rand = StdRand::new();
+
+        let corpus_dir = if options.dirs().first().unwrap().exists()
+            && options
+            .dirs()
+            .first()
+            .unwrap()
+            .read_dir()?
+            .any(|entry| entry.map_or(true, |e| !(e.file_name() == "." || e.file_name() == "..")))
+        {
+            let temp = temp_dir().join(format!("libafl-merge-{}{}", rand.next(), rand.next()));
+            eprintln!("Warning: creating an intermediary directory for minimisation at {}. We will move your existing corpus dir to.", temp.to_str().unwrap());
+            temp
+        } else {
+            options.dirs().first().cloned().unwrap()
+        };
+
+        StdState::new(
+            // RNG
+            StdRand::new(),
+            // Corpus that will be evolved, we keep it in memory for performance
+            OnDiskCorpus::with_meta_format_and_prefix(&corpus_dir, None, None, true).unwrap(),
+            // Corpus in which we store solutions (crashes in this example),
+            // on disk so the user can get them after stopping the fuzzer
+            crash_corpus,
+            // A reference to the feedbacks, to create their feedback state
+            &mut feedback,
+            // A reference to the objectives, to create their objective state
+            &mut objective,
+        )
+    }, Ok)?;
+
+    let mut fuzzer = StdFuzzer::new(scheduler, feedback, objective); // The wrapped harness function, calling out to the LLVM-style harness
+    let mut harness = |input: &BytesInput| {
+        let target = input.target_bytes();
+        let buf = target.as_slice();
+
+        let result = unsafe {
+            crate::libafl_libfuzzer_test_one_input(Some(*harness), buf.as_ptr(), buf.len())
+        };
+        if result == -2 {
+            ExitKind::Crash
+        } else {
+            *keep.borrow_mut() = result == 0;
+            ExitKind::Ok
+        }
+    };
+
+    // Create the executor for an in-process function with one observer for edge coverage and one for the execution time
+    let mut executor = TimeoutExecutor::new(
+        InProcessExecutor::new(&mut harness, observers, &mut fuzzer, &mut state, &mut mgr)?,
+        options.timeout(),
+    );
+
+    // In case the corpus is empty (on first run) or crashed while loading, reset
+    if state.must_load_initial_inputs() && !options.dirs().is_empty() {
+        let loaded_dirs = options
+            .dirs()
+            .iter()
+            .cloned()
+            .filter(|dir| state.corpus().dir_path() != dir)
+            .collect::<Vec<_>>();
+        // Load from disk
+        state
+            .load_initial_inputs(&mut fuzzer, &mut executor, &mut mgr, &loaded_dirs)
+            .unwrap_or_else(|e| {
+                panic!(
+                    "Failed to load initial corpus at {:?}: {}",
+                    options.dirs(),
+                    e
+                )
+            });
+    }
+
+    for idx in fuzzer.scheduler().removable() {
+        let testcase = state.corpus_mut().remove(idx)?;
+        fuzzer
+            .scheduler_mut()
+            .on_remove(&mut state, idx, &Some(testcase))?;
+    }
+
+    for idx in fuzzer.scheduler().current().clone() {
+        let mut testcase = state.corpus_mut().get(idx)?.borrow_mut();
+        let file_path = testcase
+            .file_path_mut()
+            .as_mut()
+            .expect("No file backing for corpus entry");
+        if let Some((base, _)) = file_path
+            .file_name()
+            .unwrap()
+            .to_str()
+            .unwrap()
+            .rsplit_once('-')
+        {
+            let mut new_file_path = file_path.clone();
+            new_file_path.pop();
+            new_file_path.push(base);
+            if new_file_path.exists() {
+                drop(testcase);
+                let testcase = state.corpus_mut().remove(idx)?;
+                fuzzer
+                    .scheduler_mut()
+                    .on_remove(&mut state, idx, &Some(testcase))?;
+            } else {
+                rename(&file_path, &new_file_path)?;
+                *file_path = new_file_path;
+            }
+        }
+    }
+
+    println!(
+        "Minimization complete; reduced to {} inputs!",
+        state.corpus().count()
+    );
+
+    let corpus_dir = state.corpus().dir_path().clone();
+    if corpus_dir != options.dirs()[0] {
+        let temp = temp_dir().join(format!(
+            "libafl-merge-orig-{}{}",
+            state.rand_mut().next(),
+            state.rand_mut().next()
+        ));
+        eprintln!(
+            "Moving original corpus directory {} to {} and replacing it with minimisation result ({}).",
+            options.dirs()[0].to_str().unwrap(),
+            temp.to_str().unwrap(),
+            corpus_dir.to_str().unwrap()
+        );
+        rename(&options.dirs()[0], temp)?;
+        rename(corpus_dir, &options.dirs()[0])?;
+    }
+
+    mgr.send_exiting()
+}

libafl_libfuzzer/libafl_libfuzzer_runtime/src/misc.rs

@@ -0,0 +1,88 @@
+use std::{
+    collections::{HashSet, VecDeque},
+    path::PathBuf,
+};
+
+use libafl::{state::HasMetadata, Error};
+use libafl_bolts::impl_serdeany;
+use serde::{Deserialize, Serialize};
+use utf8_chars::BufReadCharsExt;
+
+use crate::{options::LibfuzzerOptions, CustomMutationStatus};
+
+#[derive(Deserialize, Serialize, Debug, Default)]
+pub(crate) struct ShouldUseGrimoireMetadata {
+    should: bool,
+    non_utf8: usize,
+    utf8: usize,
+    checked: HashSet<PathBuf>,
+}
+
+impl_serdeany!(ShouldUseGrimoireMetadata);
+
+impl ShouldUseGrimoireMetadata {
+    pub fn should(&self) -> bool {
+        self.should
+    }
+}
+
+pub(crate) fn should_use_grimoire<S>(
+    maybe_state: &mut Option<S>,
+    options: &LibfuzzerOptions,
+    mutator_status: &CustomMutationStatus,
+) -> Result<Box<ShouldUseGrimoireMetadata>, Error>
+where
+    S: HasMetadata,
+{
+    let mut metadata: Box<ShouldUseGrimoireMetadata> = maybe_state
+        .as_mut()
+        .and_then(|state| state.metadata_map_mut().remove())
+        .unwrap_or_default();
+    let grimoire = if let Some(grimoire) = options.grimoire() {
+        if grimoire && !mutator_status.std_mutational {
+            eprintln!("WARNING: cowardly refusing to use grimoire after detecting the presence of a custom mutator");
+        }
+        metadata.should = grimoire && mutator_status.std_mutational;
+        metadata
+    } else if mutator_status.std_mutational {
+        if options.dirs().is_empty() {
+            eprintln!("WARNING: cowardly refusing to use grimoire since we cannot determine if the input is primarily text; set -grimoire=1 or provide a corpus directory.");
+            metadata
+        } else {
+            let mut input_queue = VecDeque::new();
+            input_queue.extend(options.dirs().iter().cloned());
+            while let Some(entry) = input_queue.pop_front() {
+                if entry.is_dir() {
+                    if let Ok(entries) = std::fs::read_dir(entry) {
+                        for entry in entries {
+                            let entry = entry?;
+                            input_queue.push_back(entry.path());
+                        }
+                    }
+                } else if entry.is_file()
+                    && entry
+                        .extension()
+                        .map_or(true, |ext| ext != "metadata" && ext != "lafl_lock")
+                    && !metadata.checked.contains(&entry)
+                {
+                    let mut reader = std::io::BufReader::new(std::fs::File::open(&entry)?);
+                    if reader.chars().all(|maybe_c| maybe_c.is_ok()) {
+                        metadata.utf8 += 1;
+                    } else {
+                        metadata.non_utf8 += 1;
+                    }
+                    metadata.checked.insert(entry);
+                }
+            }
+            metadata.should = metadata.utf8 > metadata.non_utf8; // greater-than so zero testcases doesn't enable
+            if metadata.should {
+                eprintln!("INFO: inferred grimoire mutator (found {}/{} UTF-8 inputs); if this is undesired, set -grimoire=0", metadata.utf8, metadata.utf8 + metadata.non_utf8);
+            }
+            metadata
+        }
+    } else {
+        metadata
+    };
+
+    Ok(grimoire)
+}

libafl_libfuzzer/libafl_libfuzzer_runtime/src/observers.rs

@@ -0,0 +1,366 @@
+use std::{
+    fmt::Debug,
+    hash::{Hash, Hasher},
+};
+
+use ahash::AHasher;
+use libafl::{
+    executors::ExitKind,
+    inputs::UsesInput,
+    observers::{MapObserver, Observer, TimeObserver},
+    state::UsesState,
+    Error,
+};
+use libafl_bolts::{AsIter, HasLen, Named};
+use num_traits::Bounded;
+use serde::{Deserialize, Serialize};
+
+static INITIAL_SIZE: usize = usize::MAX;
+static INITIAL_TIME: u64 = u64::MAX;
+
+pub trait ValueObserver: for<'de> Deserialize<'de> + Serialize + Debug + Named {
+    type ValueType: Bounded
+        + Default
+        + Copy
+        + Serialize
+        + for<'de> Deserialize<'de>
+        + PartialEq
+        + Hash
+        + Debug
+        + 'static;
+
+    fn value(&self) -> &Self::ValueType;
+
+    fn default_value(&self) -> &Self::ValueType;
+}
+
+#[derive(Deserialize, Serialize, Debug)]
+pub struct MappedEdgeMapObserver<M, O> {
+    inner: M,
+    name: String,
+    value_observer: O,
+}
+
+impl<M, O> MappedEdgeMapObserver<M, O>
+where
+    M: MapObserver,
+    O: ValueObserver,
+{
+    pub fn new(obs: M, value_obs: O) -> Self {
+        Self {
+            name: format!("{}_{}", value_obs.name(), obs.name()),
+            inner: obs,
+            value_observer: value_obs,
+        }
+    }
+}
+
+impl<M, O> HasLen for MappedEdgeMapObserver<M, O>
+where
+    M: HasLen,
+{
+    fn len(&self) -> usize {
+        self.inner.len()
+    }
+}
+
+impl<M, O> Named for MappedEdgeMapObserver<M, O> {
+    fn name(&self) -> &str {
+        &self.name
+    }
+}
+
+impl<M, O> MapObserver for MappedEdgeMapObserver<M, O>
+where
+    M: MapObserver + for<'it> AsIter<'it, Item = M::Entry>,
+    O: ValueObserver,
+{
+    type Entry = O::ValueType;
+
+    fn get(&self, idx: usize) -> &Self::Entry {
+        let initial = self.inner.initial();
+        if *self.inner.get(idx) == initial {
+            self.value_observer.default_value()
+        } else {
+            self.value_observer.value()
+        }
+    }
+
+    fn get_mut(&mut self, _idx: usize) -> &mut Self::Entry {
+        unimplemented!("Impossible to implement for a proxy map.")
+    }
+
+    fn usable_count(&self) -> usize {
+        self.inner.usable_count()
+    }
+
+    fn count_bytes(&self) -> u64 {
+        self.inner.count_bytes()
+    }
+
+    fn hash(&self) -> u64 {
+        let mut hasher = AHasher::default();
+        let initial = self.inner.initial();
+        for e in self.inner.as_iter() {
+            if *e == initial {
+                self.value_observer.default_value().hash(&mut hasher);
+            } else {
+                self.value_observer.value().hash(&mut hasher);
+            }
+        }
+        hasher.finish()
+    }
+
+    fn initial(&self) -> Self::Entry {
+        *self.value_observer.default_value()
+    }
+
+    fn reset_map(&mut self) -> Result<(), Error> {
+        self.inner.reset_map()
+    }
+
+    fn to_vec(&self) -> Vec<Self::Entry> {
+        let initial = self.inner.initial();
+        let default = *self.value_observer.default_value();
+        let value = *self.value_observer.value();
+        self.inner
+            .as_iter()
+            .map(|&e| if e == initial { default } else { value })
+            .collect()
+    }
+
+    fn how_many_set(&self, indexes: &[usize]) -> usize {
+        self.inner.how_many_set(indexes)
+    }
+}
+
+impl<M, O> UsesState for MappedEdgeMapObserver<M, O>
+where
+    M: UsesState,
+{
+    type State = M::State;
+}
+
+impl<M, O, S> Observer<S> for MappedEdgeMapObserver<M, O>
+where
+    M: Observer<S> + Debug,
+    O: Observer<S> + Debug,
+    S: UsesInput,
+{
+    fn pre_exec(&mut self, state: &mut S, input: &S::Input) -> Result<(), Error> {
+        self.inner.pre_exec(state, input)?;
+        self.value_observer.pre_exec(state, input)
+    }
+
+    fn post_exec(
+        &mut self,
+        state: &mut S,
+        input: &S::Input,
+        exit_kind: &ExitKind,
+    ) -> Result<(), Error> {
+        self.inner.post_exec(state, input, exit_kind)?;
+        self.value_observer.post_exec(state, input, exit_kind)
+    }
+}
+
+pub struct MappedEdgeMapIter<'it, I, O, T> {
+    inner: I,
+    initial: T,
+    value_obs: &'it O,
+}
+
+impl<'it, I, O, T> MappedEdgeMapIter<'it, I, O, T> {
+    fn new(iter: I, initial: T, value_obs: &'it O) -> Self {
+        Self {
+            inner: iter,
+            initial,
+            value_obs,
+        }
+    }
+}
+
+impl<'it, I, O, T> Iterator for MappedEdgeMapIter<'it, I, O, T>
+where
+    I: Iterator<Item = &'it T>,
+    T: PartialEq + 'it,
+    O: ValueObserver,
+{
+    type Item = &'it O::ValueType;
+
+    fn next(&mut self) -> Option<Self::Item> {
+        self.inner.next().map(|e| {
+            (*e == self.initial)
+                .then(|| self.value_obs.default_value())
+                .unwrap_or_else(|| self.value_obs.value())
+        })
+    }
+}
+
+impl<'it, M, O> AsIter<'it> for MappedEdgeMapObserver<M, O>
+where
+    M: MapObserver + for<'a> AsIter<'a, Item = M::Entry>,
+    O: ValueObserver + 'it,
+{
+    type Item = O::ValueType;
+    type IntoIter = MappedEdgeMapIter<'it, <M as AsIter<'it>>::IntoIter, O, M::Entry>;
+
+    fn as_iter(&'it self) -> Self::IntoIter {
+        let iter = self.inner.as_iter();
+        let initial = self.inner.initial();
+        MappedEdgeMapIter::new(iter, initial, &self.value_observer)
+    }
+}
+
+#[derive(Copy, Clone, Serialize, Deserialize, Debug, Default)]
+pub struct SizeValueObserver {
+    size: usize,
+}
+
+impl ValueObserver for SizeValueObserver {
+    type ValueType = usize;
+
+    fn value(&self) -> &Self::ValueType {
+        &self.size
+    }
+
+    fn default_value(&self) -> &Self::ValueType {
+        &INITIAL_SIZE
+    }
+}
+
+impl Named for SizeValueObserver {
+    fn name(&self) -> &str {
+        "size"
+    }
+}
+
+impl<S> Observer<S> for SizeValueObserver
+where
+    S: UsesInput,
+    S::Input: HasLen,
+{
+    fn pre_exec(&mut self, _state: &mut S, input: &S::Input) -> Result<(), Error> {
+        self.size = input.len();
+        Ok(())
+    }
+}
+
+#[derive(Clone, Serialize, Deserialize, Debug)]
+pub struct TimeValueObserver {
+    time: u64,
+    time_obs: TimeObserver,
+}
+
+impl TimeValueObserver {
+    pub fn new(time_obs: TimeObserver) -> Self {
+        Self {
+            time: INITIAL_TIME,
+            time_obs,
+        }
+    }
+}
+
+impl ValueObserver for TimeValueObserver {
+    type ValueType = u64;
+
+    fn value(&self) -> &Self::ValueType {
+        &self.time
+    }
+
+    fn default_value(&self) -> &Self::ValueType {
+        &INITIAL_TIME
+    }
+}
+
+impl Named for TimeValueObserver {
+    fn name(&self) -> &str {
+        self.time_obs.name()
+    }
+}
+
+impl<S> Observer<S> for TimeValueObserver
+where
+    S: UsesInput,
+{
+    fn pre_exec(&mut self, state: &mut S, input: &S::Input) -> Result<(), Error> {
+        self.time_obs.pre_exec(state, input)
+    }
+
+    fn post_exec(
+        &mut self,
+        state: &mut S,
+        input: &S::Input,
+        exit_kind: &ExitKind,
+    ) -> Result<(), Error> {
+        self.time_obs.post_exec(state, input, exit_kind)?;
+        self.time = self
+            .time_obs
+            .last_runtime()
+            .as_ref()
+            .map_or(INITIAL_TIME, |duration| {
+                u64::try_from(duration.as_micros()).unwrap_or(INITIAL_TIME)
+            });
+        Ok(())
+    }
+}
+
+#[derive(Clone, Serialize, Deserialize, Debug)]
+pub struct SizeTimeValueObserver {
+    value: u64,
+    size_obs: SizeValueObserver,
+    time_obs: TimeValueObserver,
+}
+
+impl SizeTimeValueObserver {
+    pub fn new(time_obs: TimeObserver) -> Self {
+        Self {
+            value: INITIAL_TIME,
+            size_obs: SizeValueObserver::default(),
+            time_obs: TimeValueObserver::new(time_obs),
+        }
+    }
+}
+
+impl ValueObserver for SizeTimeValueObserver {
+    type ValueType = u64;
+
+    fn value(&self) -> &Self::ValueType {
+        &self.value
+    }
+
+    fn default_value(&self) -> &Self::ValueType {
+        &INITIAL_TIME
+    }
+}
+
+impl Named for SizeTimeValueObserver {
+    fn name(&self) -> &str {
+        "size_time"
+    }
+}
+
+impl<S> Observer<S> for SizeTimeValueObserver
+where
+    S: UsesInput,
+    S::Input: HasLen,
+{
+    fn pre_exec(&mut self, state: &mut S, input: &S::Input) -> Result<(), Error> {
+        self.size_obs.pre_exec(state, input)?;
+        self.time_obs.pre_exec(state, input)
+    }
+
+    fn post_exec(
+        &mut self,
+        state: &mut S,
+        input: &S::Input,
+        exit_kind: &ExitKind,
+    ) -> Result<(), Error> {
+        self.time_obs.post_exec(state, input, exit_kind)?;
+        self.size_obs.post_exec(state, input, exit_kind)?;
+        self.value = self
+            .time_obs
+            .value()
+            .saturating_mul(*self.size_obs.value() as u64);
+        Ok(())
+    }
+}

libafl_libfuzzer/libafl_libfuzzer_runtime/src/options.rs

@@ -0,0 +1,368 @@
+use core::fmt::{Display, Formatter};
+use std::{path::PathBuf, time::Duration};
+
+use libafl::mutators::Tokens;
+
+use crate::options::RawOption::{Directory, Flag};
+
+enum RawOption<'a> {
+    Directory(&'a str),
+    Flag { name: &'a str, value: &'a str },
+}
+
+fn parse_option(arg: &str) -> Option<RawOption> {
+    if arg.starts_with("--") {
+        None
+    } else if arg.starts_with('-') {
+        if let Some((name, value)) = arg.split_at(1).1.split_once('=') {
+            Some(Flag { name, value })
+        } else {
+            eprintln!("warning: flag {arg} provided without a value; did you mean `{arg}=1'?");
+            None
+        }
+    } else {
+        Some(Directory(arg))
+    }
+}
+
+#[derive(Debug, PartialEq, Copy, Clone)]
+pub enum LibfuzzerMode {
+    Fuzz,
+    Merge,
+    Tmin,
+    Report,
+}
+
+#[derive(Debug)]
+pub enum OptionsParseError<'a> {
+    MultipleModesSelected,
+    OptionValueParseFailed(&'a str, &'a str),
+}
+
+impl<'a> Display for OptionsParseError<'a> {
+    fn fmt(&self, f: &mut Formatter<'_>) -> core::fmt::Result {
+        match self {
+            OptionsParseError::MultipleModesSelected => {
+                f.write_str("multiple modes selected in options")
+            }
+            OptionsParseError::OptionValueParseFailed(name, value) => {
+                f.write_fmt(format_args!("couldn't parse value `{value}' for {name}"))
+            }
+        }
+    }
+}
+
+#[derive(Debug, Clone)]
+pub struct ArtifactPrefix {
+    dir: PathBuf,
+    filename_prefix: Option<String>,
+}
+
+impl ArtifactPrefix {
+    fn new(path: &str) -> ArtifactPrefix {
+        let mut dir = PathBuf::from(path);
+        if path.ends_with(std::path::MAIN_SEPARATOR) {
+            Self {
+                dir,
+                filename_prefix: None,
+            }
+        } else {
+            let filename_prefix = dir.file_name().map(|s| {
+                s.to_os_string()
+                    .into_string()
+                    .expect("Provided artifact prefix is not usable")
+            });
+            dir.pop();
+            Self {
+                dir,
+                filename_prefix,
+            }
+        }
+    }
+
+    pub fn dir(&self) -> &PathBuf {
+        &self.dir
+    }
+
+    pub fn filename_prefix(&self) -> &Option<String> {
+        &self.filename_prefix
+    }
+}
+
+#[derive(Debug, Clone)]
+#[allow(clippy::struct_excessive_bools)]
+pub struct LibfuzzerOptions {
+    fuzzer_name: String,
+    mode: LibfuzzerMode,
+    artifact_prefix: Option<ArtifactPrefix>,
+    timeout: Duration,
+    grimoire: Option<bool>,
+    forks: Option<usize>,
+    dict: Option<Tokens>,
+    dirs: Vec<PathBuf>,
+    ignore_crashes: bool,
+    ignore_timeouts: bool,
+    ignore_ooms: bool,
+    rss_limit: usize,
+    malloc_limit: usize,
+    dedup: bool,
+    shrink: bool,
+    skip_tracing: bool,
+    tui: bool,
+    runs: usize,
+    close_fd_mask: u8,
+    unknown: Vec<String>,
+}
+
+impl LibfuzzerOptions {
+    pub fn new<'a>(mut args: impl Iterator<Item = &'a str>) -> Result<Self, OptionsParseError<'a>> {
+        let name = args.next().unwrap();
+        let name = if let Some(executable) = std::env::current_exe().ok().and_then(|path| {
+            path.file_name()
+                .and_then(std::ffi::OsStr::to_str)
+                .map(std::string::ToString::to_string)
+        }) {
+            executable
+        } else {
+            name.to_string()
+        };
+        args.try_fold(LibfuzzerOptionsBuilder::default(), |builder, arg| {
+            builder.consume(arg)
+        })
+        .map(|builder| builder.build(name))
+    }
+
+    pub fn fuzzer_name(&self) -> &str {
+        &self.fuzzer_name
+    }
+
+    pub fn mode(&self) -> &LibfuzzerMode {
+        &self.mode
+    }
+
+    pub fn artifact_prefix(&self) -> Option<&ArtifactPrefix> {
+        self.artifact_prefix.as_ref()
+    }
+
+    pub fn timeout(&self) -> Duration {
+        self.timeout
+    }
+
+    pub fn grimoire(&self) -> Option<bool> {
+        self.grimoire
+    }
+
+    pub fn forks(&self) -> Option<usize> {
+        self.forks
+    }
+
+    pub fn dict(&self) -> Option<&Tokens> {
+        self.dict.as_ref()
+    }
+
+    pub fn dirs(&self) -> &[PathBuf] {
+        &self.dirs
+    }
+
+    pub fn ignore_crashes(&self) -> bool {
+        self.ignore_crashes
+    }
+
+    pub fn ignore_timeouts(&self) -> bool {
+        self.ignore_timeouts
+    }
+
+    pub fn ignore_ooms(&self) -> bool {
+        self.ignore_ooms
+    }
+
+    pub fn rss_limit(&self) -> usize {
+        self.rss_limit
+    }
+
+    pub fn malloc_limit(&self) -> usize {
+        self.malloc_limit
+    }
+
+    pub fn dedup(&self) -> bool {
+        self.dedup
+    }
+
+    pub fn shrink(&self) -> bool {
+        self.shrink
+    }
+
+    pub fn skip_tracing(&self) -> bool {
+        self.skip_tracing
+    }
+
+    pub fn tui(&self) -> bool {
+        self.tui
+    }
+
+    pub fn runs(&self) -> usize {
+        self.runs
+    }
+
+    pub fn close_fd_mask(&self) -> u8 {
+        self.close_fd_mask
+    }
+
+    pub fn unknown(&self) -> &[String] {
+        &self.unknown
+    }
+}
+
+#[derive(Debug, Default)]
+#[allow(clippy::struct_excessive_bools)]
+struct LibfuzzerOptionsBuilder<'a> {
+    mode: Option<LibfuzzerMode>,
+    artifact_prefix: Option<&'a str>,
+    timeout: Option<Duration>,
+    grimoire: Option<bool>,
+    forks: Option<usize>,
+    dict: Option<&'a str>,
+    dirs: Vec<&'a str>,
+    ignore_crashes: bool,
+    ignore_timeouts: bool,
+    ignore_ooms: bool,
+    rss_limit: Option<usize>,
+    malloc_limit: Option<usize>,
+    ignore_remaining: bool,
+    dedup: bool,
+    shrink: bool,
+    skip_tracing: bool,
+    tui: bool,
+    runs: usize,
+    close_fd_mask: u8,
+    unknown: Vec<&'a str>,
+}
+
+macro_rules! parse_or_bail {
+    ($name:expr, $parsed:expr, $ty:ty) => {{
+        if let Ok(val) = $parsed.parse::<$ty>() {
+            val
+        } else {
+            return Err(OptionsParseError::OptionValueParseFailed($name, $parsed));
+        }
+    }};
+}
+
+impl<'a> LibfuzzerOptionsBuilder<'a> {
+    fn consume(mut self, arg: &'a str) -> Result<Self, OptionsParseError<'a>> {
+        if !self.ignore_remaining {
+            if let Some(option) = parse_option(arg) {
+                match option {
+                    Directory(dir) => {
+                        self.dirs.push(dir);
+                    }
+                    Flag { name, value } => match name {
+                        "merge" => {
+                            if parse_or_bail!(name, value, u64) > 0
+                                && *self.mode.get_or_insert(LibfuzzerMode::Merge)
+                                    != LibfuzzerMode::Merge
+                            {
+                                return Err(OptionsParseError::MultipleModesSelected);
+                            }
+                        }
+                        "minimize_crash" => {
+                            if parse_or_bail!(name, value, u64) > 0
+                                && *self.mode.get_or_insert(LibfuzzerMode::Tmin)
+                                    != LibfuzzerMode::Tmin
+                            {
+                                return Err(OptionsParseError::MultipleModesSelected);
+                            }
+                        }
+                        "report" => {
+                            if parse_or_bail!(name, value, u64) > 0
+                                && *self.mode.get_or_insert(LibfuzzerMode::Report)
+                                    != LibfuzzerMode::Report
+                            {
+                                return Err(OptionsParseError::MultipleModesSelected);
+                            }
+                        }
+                        "grimoire" => self.grimoire = Some(parse_or_bail!(name, value, u64) > 0),
+                        "artifact_prefix" => {
+                            self.artifact_prefix = Some(value);
+                        }
+                        "timeout" => {
+                            self.timeout =
+                                Some(value.parse().map(Duration::from_secs_f64).map_err(|_| {
+                                    OptionsParseError::OptionValueParseFailed(name, value)
+                                })?);
+                        }
+                        "dict" => self.dict = Some(value),
+                        "fork" | "jobs" => {
+                            self.forks = Some(parse_or_bail!(name, value, usize));
+                        }
+                        "ignore_crashes" => {
+                            self.ignore_crashes = parse_or_bail!(name, value, u64) > 0;
+                        }
+                        "ignore_timeouts" => {
+                            self.ignore_timeouts = parse_or_bail!(name, value, u64) > 0;
+                        }
+                        "ignore_ooms" => self.ignore_ooms = parse_or_bail!(name, value, u64) > 0,
+                        "rss_limit_mb" => {
+                            self.rss_limit = Some(parse_or_bail!(name, value, usize) << 20);
+                        }
+                        "malloc_limit_mb" => {
+                            self.malloc_limit = Some(parse_or_bail!(name, value, usize) << 20);
+                        }
+                        "ignore_remaining_args" => {
+                            self.ignore_remaining = parse_or_bail!(name, value, u64) > 0;
+                        }
+                        "dedup" => self.dedup = parse_or_bail!(name, value, u64) > 0,
+                        "shrink" => self.shrink = parse_or_bail!(name, value, u64) > 0,
+                        "skip_tracing" => self.skip_tracing = parse_or_bail!(name, value, u64) > 0,
+                        "tui" => self.tui = parse_or_bail!(name, value, u64) > 0,
+                        "runs" => self.runs = parse_or_bail!(name, value, usize),
+                        "close_fd_mask" => self.close_fd_mask = parse_or_bail!(name, value, u8),
+                        _ => {
+                            self.unknown.push(arg);
+                        }
+                    },
+                }
+            } else {
+                self.unknown.push(arg);
+            }
+        }
+        Ok(self)
+    }
+
+    fn build(self, fuzzer_name: String) -> LibfuzzerOptions {
+        LibfuzzerOptions {
+            fuzzer_name,
+            mode: self.mode.unwrap_or(LibfuzzerMode::Fuzz),
+            artifact_prefix: self.artifact_prefix.map(ArtifactPrefix::new),
+            timeout: self.timeout.unwrap_or(Duration::from_secs(1200)),
+            grimoire: self.grimoire,
+            forks: self.forks,
+            dict: self.dict.map(|path| {
+                Tokens::from_file(path).expect("Couldn't load tokens from specified dictionary")
+            }),
+            dirs: self.dirs.into_iter().map(PathBuf::from).collect(),
+            ignore_crashes: self.ignore_crashes,
+            ignore_timeouts: self.ignore_timeouts,
+            ignore_ooms: self.ignore_ooms,
+            rss_limit: match self.rss_limit.unwrap_or(2 << 30) {
+                0 => usize::MAX,
+                value => value,
+            },
+            malloc_limit: match self.malloc_limit.or(self.rss_limit).unwrap_or(2 << 30) {
+                0 => usize::MAX,
+                value => value,
+            },
+            dedup: self.dedup,
+            shrink: self.shrink,
+            skip_tracing: self.skip_tracing,
+            tui: self.tui,
+            runs: self.runs,
+            close_fd_mask: self.close_fd_mask,
+            unknown: self
+                .unknown
+                .into_iter()
+                .map(std::string::ToString::to_string)
+                .collect(),
+        }
+    }
+}

libafl_libfuzzer/libafl_libfuzzer_runtime/src/report.rs

@@ -0,0 +1,61 @@
+use std::ffi::c_int;
+
+use libafl::{
+    events::{ProgressReporter, SimpleEventManager},
+    executors::HasObservers,
+    feedbacks::{MapFeedbackMetadata, MAPFEEDBACK_PREFIX},
+    inputs::UsesInput,
+    monitors::SimpleMonitor,
+    stages::StagesTuple,
+    state::{
+        HasClientPerfMonitor, HasExecutions, HasLastReportTime, HasMetadata, HasNamedMetadata,
+    },
+    Error, Fuzzer,
+};
+
+use crate::{fuzz_with, options::LibfuzzerOptions};
+
+#[allow(clippy::unnecessary_wraps, clippy::cast_precision_loss)]
+fn do_report<F, ST, E, S, EM>(
+    _options: &LibfuzzerOptions,
+    _fuzzer: &mut F,
+    _stages: &mut ST,
+    _executor: &mut E,
+    state: &S,
+    _mgr: &mut EM,
+) -> Result<(), Error>
+where
+    F: Fuzzer<E, EM, ST, State = S>,
+    S: HasClientPerfMonitor
+        + HasMetadata
+        + HasNamedMetadata
+        + HasExecutions
+        + UsesInput
+        + HasLastReportTime,
+    E: HasObservers<State = S>,
+    EM: ProgressReporter<State = S>,
+    ST: StagesTuple<E, EM, S, F>,
+{
+    let meta = state
+        .named_metadata::<MapFeedbackMetadata<u8>>(&(MAPFEEDBACK_PREFIX.to_string() + "edges"))
+        .unwrap();
+    let observed = meta.history_map.iter().filter(|&&e| e != 0).count();
+    let total = meta.history_map.len();
+
+    println!(
+        "Observed {observed}/{total} edges ({}%)",
+        observed as f64 / total as f64
+    );
+
+    Ok(())
+}
+
+pub fn report(
+    options: &LibfuzzerOptions,
+    harness: &extern "C" fn(*const u8, usize) -> c_int,
+) -> Result<(), Error> {
+    fuzz_with!(options, harness, do_report, |reporter| {
+        let mgr = SimpleEventManager::new(SimpleMonitor::new(|s| eprintln!("{s}")));
+        crate::start_fuzzing_single(reporter, None, mgr)
+    })
+}

libafl_libfuzzer/libafl_libfuzzer_runtime/src/schedulers.rs

@@ -0,0 +1,82 @@
+use std::{
+    collections::{BTreeSet, HashMap},
+    marker::PhantomData,
+};
+
+use libafl::{
+    corpus::{Corpus, CorpusId, Testcase},
+    feedbacks::MapNoveltiesMetadata,
+    inputs::UsesInput,
+    schedulers::{RemovableScheduler, Scheduler},
+    state::{HasCorpus, HasMetadata, UsesState},
+    Error,
+};
+
+#[derive(Clone, Debug)]
+pub struct MergeScheduler<S> {
+    mapping: HashMap<usize, CorpusId>,
+    all: BTreeSet<CorpusId>,
+    phantom: PhantomData<S>,
+}
+
+impl<S> UsesState for MergeScheduler<S>
+where
+    S: UsesInput,
+{
+    type State = S;
+}
+
+impl<S> RemovableScheduler for MergeScheduler<S>
+where
+    S: UsesInput + HasCorpus,
+{
+    fn on_remove(
+        &mut self,
+        _state: &mut Self::State,
+        idx: CorpusId,
+        _testcase: &Option<Testcase<<Self::State as UsesInput>::Input>>,
+    ) -> Result<(), Error> {
+        self.all.remove(&idx);
+        Ok(())
+    }
+}
+
+impl<S> Scheduler for MergeScheduler<S>
+where
+    S: UsesInput + HasCorpus,
+{
+    fn on_add(&mut self, state: &mut Self::State, idx: CorpusId) -> Result<(), Error> {
+        self.all.insert(idx);
+        let testcase = state.corpus().get(idx)?.borrow();
+        let meta = testcase.metadata::<MapNoveltiesMetadata>()?;
+        for cov_idx in &meta.list {
+            self.mapping.insert(*cov_idx, idx);
+        }
+        Ok(())
+    }
+
+    fn next(&mut self, _state: &mut Self::State) -> Result<CorpusId, Error> {
+        unimplemented!("Not suitable for actual scheduling.");
+    }
+}
+
+impl<S> MergeScheduler<S> {
+    pub fn new() -> Self {
+        Self {
+            mapping: HashMap::default(),
+            all: BTreeSet::default(),
+            phantom: PhantomData,
+        }
+    }
+
+    pub fn removable(&self) -> BTreeSet<CorpusId> {
+        self.all
+            .difference(&self.mapping.values().copied().collect())
+            .copied()
+            .collect()
+    }
+
+    pub fn current(&self) -> &BTreeSet<CorpusId> {
+        &self.all
+    }
+}

libafl_libfuzzer/libafl_libfuzzer_runtime/src/tmin.rs

@@ -0,0 +1,186 @@
+use std::{
+    ffi::c_int,
+    fs::{read, write},
+    path::PathBuf,
+};
+
+use libafl::{
+    corpus::{Corpus, HasTestcase, InMemoryCorpus, Testcase},
+    events::SimpleEventManager,
+    executors::{inprocess::TimeoutInProcessForkExecutor, ExitKind},
+    feedbacks::{CrashFeedbackFactory, TimeoutFeedbackFactory},
+    inputs::{BytesInput, HasBytesVec, HasTargetBytes},
+    mutators::{havoc_mutations_no_crossover, Mutator, StdScheduledMutator},
+    schedulers::QueueScheduler,
+    stages::StdTMinMutationalStage,
+    state::{HasCorpus, StdState},
+    Error, Fuzzer, StdFuzzer,
+};
+use libafl_bolts::{
+    rands::{RandomSeed, RomuDuoJrRand, StdRand},
+    shmem::{ShMemProvider, StdShMemProvider},
+    tuples::tuple_list,
+    AsSlice, HasLen,
+};
+use libafl_targets::LLVMCustomMutator;
+
+use crate::{options::LibfuzzerOptions, CustomMutationStatus};
+
+type TMinState =
+    StdState<BytesInput, InMemoryCorpus<BytesInput>, RomuDuoJrRand, InMemoryCorpus<BytesInput>>;
+
+fn minimize_crash_with_mutator<M: Mutator<BytesInput, TMinState>>(
+    options: &LibfuzzerOptions,
+    harness: extern "C" fn(*const u8, usize) -> c_int,
+    mutator: M,
+    mut state: TMinState,
+) -> Result<(), Error> {
+    let mut mgr = SimpleEventManager::printing();
+
+    assert_eq!(
+        options.dirs().len(),
+        1,
+        "Must provide exactly one input to minimise"
+    );
+    assert!(options.dirs()[0].exists(), "Input specified does not exist");
+    assert!(options.dirs()[0].is_file(), "Input specified is not a file");
+
+    let input = BytesInput::new(read(&options.dirs()[0])?);
+
+    let mut harness = |input: &BytesInput| {
+        let target = input.target_bytes();
+        let buf = target.as_slice();
+
+        let result = unsafe {
+            crate::libafl_libfuzzer_test_one_input(Some(harness), buf.as_ptr(), buf.len())
+        };
+        match result {
+            -2 => ExitKind::Crash,
+            _ => ExitKind::Ok,
+        }
+    };
+
+    let mut fuzzer = StdFuzzer::new(QueueScheduler::new(), (), ());
+
+    let shmem_provider = StdShMemProvider::new()?;
+    let mut executor = TimeoutInProcessForkExecutor::new(
+        &mut harness,
+        (),
+        &mut fuzzer,
+        &mut state,
+        &mut mgr,
+        options.timeout(),
+        shmem_provider,
+    )?;
+
+    let exit_kind = fuzzer.execute_input(&mut state, &mut executor, &mut mgr, &input)?;
+
+    let size = input.len();
+    let id = state.corpus_mut().add(Testcase::new(input))?;
+
+    match exit_kind {
+        ExitKind::Crash => {
+            let factory = CrashFeedbackFactory::default();
+            let tmin = StdTMinMutationalStage::new(
+                mutator,
+                factory,
+                if options.runs() == 0 {
+                    128
+                } else {
+                    options.runs()
+                },
+            );
+            let mut stages = tuple_list!(tmin);
+            fuzzer.fuzz_one(&mut stages, &mut executor, &mut state, &mut mgr)?;
+        }
+        ExitKind::Timeout => {
+            let factory = TimeoutFeedbackFactory::default();
+            let tmin = StdTMinMutationalStage::new(
+                mutator,
+                factory,
+                if options.runs() == 0 {
+                    128
+                } else {
+                    options.runs()
+                },
+            );
+            let mut stages = tuple_list!(tmin);
+            fuzzer.fuzz_one(&mut stages, &mut executor, &mut state, &mut mgr)?;
+        }
+        kind => unimplemented!("Unsupported exit kind for test minification: {:?}", kind),
+    }
+
+    let mut testcase = state.testcase_mut(id)?;
+    let input = testcase.load_input(state.corpus())?.bytes().to_vec();
+    drop(testcase);
+    if input.len() >= size {
+        eprintln!(
+            "Unable to reduce {}",
+            options.dirs()[0].as_path().as_os_str().to_str().unwrap()
+        );
+    } else {
+        let (mut dest, filename_prefix) = options.artifact_prefix().map_or_else(
+            || (PathBuf::default(), ""),
+            |artifact_prefix| {
+                (
+                    artifact_prefix.dir().clone(),
+                    artifact_prefix
+                        .filename_prefix()
+                        .as_ref()
+                        .map_or("", String::as_str),
+                )
+            },
+        );
+        dest.push(format!(
+            "{}minimized-from-{}",
+            filename_prefix,
+            options.dirs()[0].file_name().unwrap().to_str().unwrap()
+        ));
+        write(&dest, input)?;
+        println!(
+            "Wrote minimised input to {}",
+            dest.file_name().unwrap().to_str().unwrap()
+        );
+    }
+
+    Ok(())
+}
+
+pub fn minimize_crash(
+    options: &LibfuzzerOptions,
+    harness: extern "C" fn(*const u8, usize) -> c_int,
+) -> Result<(), Error> {
+    println!(
+        "Attempting to minimise a crash: {}",
+        options
+            .dirs()
+            .iter()
+            .map(|p| p
+                .to_str()
+                .expect("Couldn't render the filename as a string!"))
+            .collect::<Vec<_>>()
+            .join(", ")
+    );
+    let mutator_status = CustomMutationStatus::new();
+
+    let state = StdState::new(
+        StdRand::new(),
+        InMemoryCorpus::<BytesInput>::new(),
+        InMemoryCorpus::new(),
+        &mut (),
+        &mut (),
+    )?;
+
+    // TODO configure with mutation stacking options from libfuzzer
+    if mutator_status.custom_mutation {
+        let custom_mutator = unsafe {
+            LLVMCustomMutator::mutate_unchecked(StdScheduledMutator::new(
+                havoc_mutations_no_crossover(),
+            ))
+        };
+        minimize_crash_with_mutator(options, harness, custom_mutator, state)
+    } else {
+        let std_mutator = StdScheduledMutator::new(havoc_mutations_no_crossover());
+        minimize_crash_with_mutator(options, harness, std_mutator, state)
+    }
+}

libafl_libfuzzer/src/lib.rs

@@ -0,0 +1,21 @@
+//! `libafl_libfuzzer` offers a "permanent" replacement for the now-deprecated libfuzzer
+//!
+//! This crate only offers sufficient functionality to replace libfuzzer for cargo-fuzz in its
+//! current state, but may be expanded to handle other flags in the future.
+//!
+//! This crate links to a (separately built) internal crate which affords the actual functionality.
+//! The internal crate must be built separately to ensure flags from dependent crates are not leaked
+//! to the runtime (e.g., to prevent coverage being collected on the runtime).
+
+use std::ffi::{c_char, c_int};
+
+pub use libfuzzer_sys::*;
+
+extern "C" {
+    /// `LLVMFuzzerRunDriver` allows for harnesses which specify their own main. See: https://llvm.org/docs/LibFuzzer.html#using-libfuzzer-as-a-library
+    pub fn LLVMFuzzerRunDriver(
+        argc: *mut c_int,
+        argv: *mut *mut *const c_char,
+        harness_fn: Option<extern "C" fn(*const u8, usize) -> c_int>,
+    ) -> c_int;
+}

libafl_targets/Cargo.toml

@@ -18,8 +18,10 @@ all-features = true
 [features]
 default = ["std", "sanitizers_flags"]
 std = ["libafl/std"]
-libfuzzer = []
+libfuzzer = ["std", "sanitizer_interfaces"]
 libfuzzer_no_link_main = ["libfuzzer"]
+libfuzzer_define_run_driver = ["libfuzzer"]
+libfuzzer_oom = ["libfuzzer"]
 sanitizers_flags = []
 pointer_maps = []
 sancov_pcguard_edges = []
@@ -28,15 +30,18 @@ sancov_value_profile = []
 sancov_8bit = []
 sancov_cmplog = []
 sancov_pcguard = ["sancov_pcguard_hitcounts"]
+sanitizer_interfaces = []
 clippy = [] # Ignore compiler warnings during clippy
 observers = ["intervaltree", "ahash"]
 
 [build-dependencies]
+bindgen = "0.64.0"
 cc = { version = "1.0", features = ["parallel"] }
 
 [dependencies]
 libafl = { path = "../libafl", version = "0.10.1", default-features = false, features = [] }
 libafl_bolts = { path = "../libafl_bolts", version = "0.10.1", default-features = false, features = [] }
+libc = "0.2"
 log = "0.4.20"
 
 rangemap = "1.3"

libafl_targets/build.rs

@@ -52,9 +52,6 @@ fn main() {
     println!("cargo:rerun-if-env-changed=LIBAFL_CMPLOG_MAP_H");
     println!("cargo:rerun-if-env-changed=LIBAFL_ACCOUNTING_MAP_SIZE");
 
-    //std::env::set_var("CC", "clang");
-    //std::env::set_var("CXX", "clang++");
-
     #[cfg(any(feature = "sancov_value_profile", feature = "sancov_cmplog"))]
     {
         println!("cargo:rerun-if-changed=src/sancov_cmp.c");
@@ -89,6 +86,8 @@ fn main() {
 
         #[cfg(feature = "libfuzzer_no_link_main")]
         libfuzzer.define("FUZZER_NO_LINK_MAIN", "1");
+        #[cfg(feature = "libfuzzer_define_run_driver")]
+        libfuzzer.define("FUZZER_DEFINE_RUN_DRIVER", "1");
 
         libfuzzer.compile("libfuzzer");
     }
@@ -96,6 +95,23 @@ fn main() {
     println!("cargo:rerun-if-changed=src/common.h");
     println!("cargo:rerun-if-changed=src/common.c");
 
+    #[cfg(feature = "sanitizer_interfaces")]
+    {
+        println!("cargo:rerun-if-changed=src/sanitizer_interfaces.h");
+
+        let build = bindgen::builder()
+            .header("src/sanitizer_interfaces.h")
+            .use_core()
+            .generate_comments(true)
+            .parse_callbacks(Box::new(bindgen::CargoCallbacks))
+            .generate()
+            .expect("Couldn't generate the sanitizer headers!");
+
+        build
+            .write_to_file(Path::new(&out_dir).join("sanitizer_interfaces.rs"))
+            .expect("Couldn't write the sanitizer headers!");
+    }
+
     let mut common = cc::Build::new();
 
     #[cfg(feature = "sanitizers_flags")]

libafl_targets/src/cmplog.c

@@ -9,14 +9,14 @@
   #include <windows.h>
 
 void *__libafl_asan_region_is_poisoned(void *beg, size_t size) {
-
   (void)beg;
   (void)size;
   return NULL;
-
 }
 
-#pragma comment(linker, "/alternatename:__asan_region_is_poisoned=__libafl_asan_region_is_poisoned")
+  #pragma comment( \
+      linker,      \
+      "/alternatename:__asan_region_is_poisoned=__libafl_asan_region_is_poisoned")
 
 #elif defined(__unix__) || (defined(__APPLE__) && defined(__MACH__))
 
@@ -27,31 +27,29 @@ void *__libafl_asan_region_is_poisoned(void *beg, size_t size) {
 static int dummy_fd[2] = {2, 2};
 static int dymmy_initialized = 0;
 
-__attribute__((weak)) void *__asan_region_is_poisoned(void *beg, size_t size) {
+__attribute__((weak)) void *__asan_region_is_poisoned(const void *beg,
-
+                                                      size_t      size) {
   (void)beg;
   (void)size;
   return NULL;
-
 }
 
 #endif
 
 CmpLogMap *libafl_cmplog_map_ptr = &libafl_cmplog_map;
 
-void __libafl_targets_cmplog_instructions(uintptr_t k, uint8_t shape, uint64_t arg1, uint64_t arg2) {
+void __libafl_targets_cmplog_instructions(uintptr_t k, uint8_t shape,
-
+                                          uint64_t arg1, uint64_t arg2) {
-  STATIC_ASSERT(sizeof(libafl_cmplog_map_ptr->vals.operands) == sizeof(libafl_cmplog_map_ptr->vals.routines));
+  STATIC_ASSERT(sizeof(libafl_cmplog_map_ptr->vals.operands) ==
+                sizeof(libafl_cmplog_map_ptr->vals.routines));
 
   __libafl_targets_cmplog(k, shape, arg1, arg2);
-
 }
 
 // POSIX shenanigan to see if an area is mapped.
 // If it is mapped as X-only, we have a problem, so maybe we should add a check
 // to avoid to call it on .text addresses
-static long area_is_valid(void *ptr, size_t len) {
+static long area_is_valid(const void *ptr, size_t len) {
-
   if (!ptr || __asan_region_is_poisoned(ptr, len)) { return 0; }
 
   long valid_len;
@@ -62,9 +60,7 @@ static long area_is_valid(void *ptr, size_t len) {
 #elif defined(__unix__) || (defined(__APPLE__) && defined(__MACH__))
   if (!dymmy_initialized) {
     if ((dummy_fd[1] = open("/dev/null", O_WRONLY)) < 0) {
-      if (pipe(dummy_fd) < 0) {
+      if (pipe(dummy_fd) < 0) { dummy_fd[1] = 1; }
-        dummy_fd[1] = 1;
-      }
     }
     dymmy_initialized = 1;
   }
@@ -94,20 +90,11 @@ static long area_is_valid(void *ptr, size_t len) {
     // or not, neither by SYS_write nor msync() :-(
     return (long)(page - p);
   }
-
 }
 
-void __libafl_targets_cmplog_routines(uintptr_t k, uint8_t *ptr1, uint8_t *ptr2) {
+void __libafl_targets_cmplog_routines_checked(uintptr_t k, const uint8_t *ptr1,
-
+                                              const uint8_t *ptr2, size_t len) {
-  if (!libafl_cmplog_enabled) { return; }
+  libafl_cmplog_enabled = false;
-
-  int l1, l2;
-  if ((l1 = area_is_valid(ptr1, CMPLOG_RTN_LEN)) <= 0 ||
-      (l2 = area_is_valid(ptr2, CMPLOG_RTN_LEN)) <= 0) {
-    return;
-  }
-  int len = MIN(l1, l2);
-
   uint32_t hits;
 
   if (libafl_cmplog_map_ptr->headers[k].kind != CMPLOG_KIND_RTN) {
@@ -125,23 +112,46 @@ void __libafl_targets_cmplog_routines(uintptr_t k, uint8_t *ptr1, uint8_t *ptr2)
   hits &= CMPLOG_MAP_RTN_H - 1;
   MEMCPY(libafl_cmplog_map_ptr->vals.routines[k][hits].v0, ptr1, len);
   MEMCPY(libafl_cmplog_map_ptr->vals.routines[k][hits].v1, ptr2, len);
-
+  libafl_cmplog_enabled = true;
 }
 
-void __cmplog_rtn_hook(uint8_t *ptr1, uint8_t *ptr2) {
+void __libafl_targets_cmplog_routines(uintptr_t k, const uint8_t *ptr1,
+                                      const uint8_t *ptr2) {
+  if (!libafl_cmplog_enabled) { return; }
 
+  int l1, l2;
+  if ((l1 = area_is_valid(ptr1, CMPLOG_RTN_LEN)) <= 0 ||
+      (l2 = area_is_valid(ptr2, CMPLOG_RTN_LEN)) <= 0) {
+    return;
+  }
+  int len = MIN(l1, l2);
+
+  __libafl_targets_cmplog_routines_checked(k, ptr1, ptr2, len);
+}
+
+void __libafl_targets_cmplog_routines_len(uintptr_t k, const uint8_t *ptr1,
+                                          const uint8_t *ptr2, size_t len) {
+  if (!libafl_cmplog_enabled) { return; }
+
+  if (area_is_valid(ptr1, CMPLOG_RTN_LEN) <= 0 ||
+      area_is_valid(ptr2, CMPLOG_RTN_LEN) <= 0) {
+    return;
+  }
+
+  __libafl_targets_cmplog_routines_checked(k, ptr1, ptr2, len);
+}
+
+static inline void __cmplog_rtn_hook(const uint8_t *ptr1, const uint8_t *ptr2) {
   uintptr_t k = RETADDR;
   k = (k >> 4) ^ (k << 8);
   k &= CMPLOG_MAP_W - 1;
 
   __libafl_targets_cmplog_routines(k, ptr1, ptr2);
-
 }
 
 // gcc libstdc++
 // _ZNKSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEE7compareEPKc
-static uint8_t *get_gcc_stdstring(uint8_t *string) {
+static const uint8_t *get_gcc_stdstring(const uint8_t *string) {
-
   uint32_t *len = (uint32_t *)(string + 8);
 
   if (*len < 16) {  // in structure
@@ -150,13 +160,11 @@ static uint8_t *get_gcc_stdstring(uint8_t *string) {
     uint8_t **ptr = (uint8_t **)string;
     return (*ptr);
   }
-
 }
 
 // llvm libc++ _ZNKSt3__112basic_stringIcNS_11char_traitsIcEENS_9allocator
 //             IcEEE7compareEmmPKcm
-static uint8_t *get_llvm_stdstring(uint8_t *string) {
+static const uint8_t *get_llvm_stdstring(const uint8_t *string) {
-
   // length is in: if ((string[0] & 1) == 0) {uint8_t len = (string[0] >> 1);}
   // or: if (string[0] & 1) {uint32_t *len = (uint32_t *) (string + 8);}
 
@@ -166,52 +174,44 @@ static uint8_t *get_llvm_stdstring(uint8_t *string) {
   } else {  // in structure
     return (string + 1);
   }
-
 }
 
-void __cmplog_rtn_gcc_stdstring_cstring(uint8_t *stdstring, uint8_t *cstring) {
+void __cmplog_rtn_gcc_stdstring_cstring(const uint8_t *stdstring,
-
+                                        const uint8_t *cstring) {
   if (!libafl_cmplog_enabled) { return; }
-  if (area_is_valid(stdstring, 32) <= 0) {
+  if (area_is_valid(stdstring, 32) <= 0) { return; }
-    return;
-  }
 
   __cmplog_rtn_hook(get_gcc_stdstring(stdstring), cstring);
-
 }
 
-void __cmplog_rtn_gcc_stdstring_stdstring(uint8_t *stdstring1, uint8_t *stdstring2) {
+void __cmplog_rtn_gcc_stdstring_stdstring(const uint8_t *stdstring1,
-
+                                          const uint8_t *stdstring2) {
   if (!libafl_cmplog_enabled) { return; }
-  if (area_is_valid(stdstring1, 32) <= 0 || area_is_valid(stdstring2, 32) <= 0) {
+  if (area_is_valid(stdstring1, 32) <= 0 ||
+      area_is_valid(stdstring2, 32) <= 0) {
     return;
   }
 
   __cmplog_rtn_hook(get_gcc_stdstring(stdstring1),
                     get_gcc_stdstring(stdstring2));
-
 }
 
-void __cmplog_rtn_llvm_stdstring_cstring(uint8_t *stdstring, uint8_t *cstring) {
+void __cmplog_rtn_llvm_stdstring_cstring(const uint8_t *stdstring,
-
+                                         const uint8_t *cstring) {
   if (!libafl_cmplog_enabled) { return; }
-  if (area_is_valid(stdstring, 32) <= 0){
+  if (area_is_valid(stdstring, 32) <= 0) { return; }
-    return;
-  }
 
   __cmplog_rtn_hook(get_llvm_stdstring(stdstring), cstring);
-
 }
 
-void __cmplog_rtn_llvm_stdstring_stdstring(uint8_t *stdstring1, uint8_t *stdstring2) {
+void __cmplog_rtn_llvm_stdstring_stdstring(const uint8_t *stdstring1,
-
+                                           const uint8_t *stdstring2) {
   if (!libafl_cmplog_enabled) { return; }
-  if (area_is_valid(stdstring1, 32) <= 0 || area_is_valid(stdstring2, 32) <= 0) {
+  if (area_is_valid(stdstring1, 32) <= 0 ||
+      area_is_valid(stdstring2, 32) <= 0) {
     return;
   }
 
   __cmplog_rtn_hook(get_llvm_stdstring(stdstring1),
                     get_llvm_stdstring(stdstring2));
-
 }
-

libafl_targets/src/cmplog.h

@@ -2,6 +2,7 @@
 #define __LIBAFL_TARGETS_CMPLOG__
 
 #include "common.h"
+#include <stddef.h>
 
 #ifndef CMPLOG_MAP_W
   #define CMPLOG_MAP_W 65536
@@ -50,12 +51,16 @@ extern uint8_t libafl_cmplog_enabled;
 void __libafl_targets_cmplog_instructions(uintptr_t k, uint8_t shape,
                                           uint64_t arg1, uint64_t arg2);
 
-void __libafl_targets_cmplog_routines(uintptr_t k, uint8_t *ptr1,
+void __libafl_targets_cmplog_routines(uintptr_t k, const uint8_t *ptr1,
-                                      uint8_t *ptr2);
+                                      const uint8_t *ptr2);
+
+void __libafl_targets_cmplog_routines_len(uintptr_t k, const uint8_t *ptr1,
+                                          const uint8_t *ptr2, size_t len);
 
 static inline void __libafl_targets_cmplog(uintptr_t k, uint8_t shape,
                                            uint64_t arg1, uint64_t arg2) {
   if (!libafl_cmplog_enabled) { return; }
+  libafl_cmplog_enabled = false;
 
   uint16_t hits;
   if (libafl_cmplog_map_ptr->headers[k].kind != CMPLOG_KIND_INS) {
@@ -73,6 +78,7 @@ static inline void __libafl_targets_cmplog(uintptr_t k, uint8_t shape,
   hits &= CMPLOG_MAP_H - 1;
   libafl_cmplog_map_ptr->vals.operands[k][hits].v0 = arg1;
   libafl_cmplog_map_ptr->vals.operands[k][hits].v1 = arg2;
+  libafl_cmplog_enabled = true;
 }
 
 #endif

libafl_targets/src/lib.rs

@@ -79,6 +79,20 @@ pub mod sancov_cmp;
 #[cfg(any(feature = "sancov_cmplog", feature = "sancov_value_profile"))]
 pub use sancov_cmp::*;
 
+/// Module containing bindings to the various sanitizer interface headers
+#[cfg(feature = "sanitizer_interfaces")]
+pub mod sanitizer_ifaces {
+    #![allow(non_snake_case)]
+    #![allow(non_camel_case_types)]
+    #![allow(non_upper_case_globals)]
+    #![allow(unused)]
+    #![allow(improper_ctypes)]
+    #![allow(clippy::unreadable_literal)]
+    #![allow(missing_docs)]
+    #![allow(missing_debug_implementations)]
+    include!(concat!(env!("OUT_DIR"), "/sanitizer_interfaces.rs"));
+}
+
 #[cfg(feature = "libfuzzer")]
 pub mod libfuzzer;
 #[cfg(feature = "libfuzzer")]

libafl_targets/src/libfuzzer.c

@@ -1,5 +1,10 @@
 #include "common.h"
 #include <stddef.h>
+#ifdef __APPLE__
+  #include <malloc/malloc.h>
+#else
+  #include <malloc.h>
+#endif
 
 #pragma GCC diagnostic push
 #pragma GCC diagnostic ignored "-Wunused-parameter"
@@ -8,34 +13,53 @@ EXT_FUNC(LLVMFuzzerCustomMutator, size_t,
          (uint8_t * Data, size_t Size, size_t MaxSize, unsigned int Seed),
          false);
 EXT_FUNC(LLVMFuzzerCustomCrossOver, size_t,
-         (const uint8_t *Data1, size_t Size1,
+         (const uint8_t *Data1, size_t Size1, const uint8_t *Data2,
-          const uint8_t *Data2, size_t Size2,
+          size_t Size2, uint8_t *Out, size_t MaxOutSize, unsigned int Seed),
-          uint8_t *Out, size_t MaxOutSize, unsigned int Seed),
          false);
-EXT_FUNC_IMPL(LLVMFuzzerTestOneInput, int, (uint8_t *Data, size_t Size), false) {
+EXT_FUNC_IMPL(LLVMFuzzerTestOneInput, int, (const uint8_t *Data, size_t Size),
+              false) {
   return 0;
 }
 
-EXT_FUNC_IMPL(libafl_main, void, (void), false) {
+EXT_FUNC(libafl_main, void, (void), false);
-}
+#ifdef FUZZER_DEFINE_RUN_DRIVER
+extern int LLVMFuzzerRunDriver(int *argc, char ***argv,
+                               int (*UserCb)(const uint8_t *Data, size_t Size));
+#endif
 
 #ifndef FUZZER_NO_LINK_MAIN
 EXT_FUNC_IMPL(main, int, (int argc, char **argv), false) {
+  if (CHECK_WEAK_FN(libafl_main)) {
     libafl_main();
     return 0;
   }
+#ifdef FUZZER_DEFINE_RUN_DRIVER
+  return LLVMFuzzerRunDriver(&argc, &argv, &LLVMFuzzerTestOneInput);
+#else
+  return 0;
+#endif
+}
 
   #if defined(_WIN32)
 // If we do not add the main, the MSVC linker fails with:
 // LINK : fatal error LNK1561: entry point must be defined
 int main(int argc, char **argv) {
+  if (CHECK_WEAK_FN(libafl_main)) {
     libafl_main();
+    return 0;
+  }
+  return LLVMFuzzerRunDriver(&argc, &argv, &LLVMFuzzerTestOneInput);
 }
   #endif
 #endif
 
 #pragma GCC diagnostic pop
 
+// take a page out of libfuzzer's book: static define __sancov_lowest_stack
+// since we don't support it yet
+// TODO support it
+MAYBE_THREAD_LOCAL uintptr_t __sancov_lowest_stack;
+
 EXPORT_FN int libafl_targets_has_libfuzzer_init() {
   return CHECK_WEAK_FN(LLVMFuzzerInitialize);
 }
@@ -47,3 +71,39 @@ EXPORT_FN int libafl_targets_libfuzzer_init(int *argc, char ***argv) {
     return 0;
   }
 }
+
+EXPORT_FN int libafl_targets_has_libfuzzer_custom_mutator() {
+  return CHECK_WEAK_FN(LLVMFuzzerCustomMutator);
+}
+
+// trust the user to check this appropriately :)
+EXPORT_FN size_t libafl_targets_libfuzzer_custom_mutator(uint8_t     *Data,
+                                                         size_t       Size,
+                                                         size_t       MaxSize,
+                                                         unsigned int Seed) {
+  return LLVMFuzzerCustomMutator(Data, Size, MaxSize, Seed);
+}
+
+EXPORT_FN int libafl_targets_has_libfuzzer_custom_crossover() {
+  return CHECK_WEAK_FN(LLVMFuzzerCustomCrossOver);
+}
+
+// trust the user to check this appropriately :)
+EXPORT_FN size_t libafl_targets_libfuzzer_custom_crossover(
+    const uint8_t *Data1, size_t Size1, const uint8_t *Data2, size_t Size2,
+    uint8_t *Out, size_t MaxOutSize, unsigned int Seed) {
+  return LLVMFuzzerCustomCrossOver(Data1, Size1, Data2, Size2, Out, MaxOutSize,
+                                   Seed);
+}
+
+EXPORT_FN size_t libafl_check_malloc_size(void *ptr) {
+#if defined(__APPLE__)
+  return malloc_size(ptr);
+#elif defined(__GNUC__)
+  return malloc_usable_size(ptr);
+#elif defined(_WIN32)
+  return _msize(ptr);
+#else
+  return 0;
+#endif
+}

libafl_targets/src/libfuzzer/mod.rs

@@ -4,11 +4,17 @@
 
 use alloc::{string::String, vec::Vec};
 
+mod mutators;
+pub use mutators::*;
+
+mod observers;
+pub use observers::*;
+
 extern "C" {
-    /// int LLVMFuzzerTestOneInput(const uint8_t *Data, size_t Size)
+    // int LLVMFuzzerTestOneInput(const uint8_t *Data, size_t Size)
     fn LLVMFuzzerTestOneInput(data: *const u8, size: usize) -> i32;
 
-    // libafl_targets_libfuzzer_init calls LLVMFUzzerInitialize()
+    // libafl_targets_libfuzzer_init calls LLVMFuzzerInitialize()
     fn libafl_targets_libfuzzer_init(argc: *const i32, argv: *const *const *const u8) -> i32;
 }
 

libafl_targets/src/libfuzzer/mutators.rs

@@ -0,0 +1,457 @@
+use alloc::rc::{Rc, Weak};
+use std::{
+    cell::RefCell,
+    marker::PhantomData,
+    ops::Deref,
+    prelude::rust_2015::{Box, Vec},
+};
+
+use libafl::{
+    corpus::Corpus,
+    inputs::{BytesInput, HasBytesVec, UsesInput},
+    mutators::{
+        ComposedByMutations, MutationId, MutationResult, Mutator, MutatorsTuple, ScheduledMutator,
+    },
+    random_corpus_id,
+    state::{HasCorpus, HasMaxSize, HasRand},
+    Error,
+};
+use libafl_bolts::{rands::Rand, AsSlice, Named};
+
+extern "C" {
+    fn libafl_targets_has_libfuzzer_custom_mutator() -> bool;
+    fn libafl_targets_libfuzzer_custom_mutator(
+        data: *mut u8,
+        size: usize,
+        max_size: usize,
+        seed: u32,
+    ) -> usize;
+
+    fn libafl_targets_has_libfuzzer_custom_crossover() -> bool;
+    fn libafl_targets_libfuzzer_custom_crossover(
+        data1: *const u8,
+        size1: usize,
+        data2: *const u8,
+        size2: usize,
+        out: *mut u8,
+        max_out_size: usize,
+        seed: u32,
+    ) -> usize;
+}
+
+/// Detect the presence of a user-defined custom mutator
+#[must_use]
+pub fn has_custom_mutator() -> bool {
+    unsafe { libafl_targets_has_libfuzzer_custom_mutator() }
+}
+
+/// Detect the presence of a user-defined custom crossover
+#[must_use]
+pub fn has_custom_crossover() -> bool {
+    unsafe { libafl_targets_has_libfuzzer_custom_crossover() }
+}
+
+/// Erased mutator for dynamic mutator access by the custom mutator/crossover
+trait ErasedLLVMFuzzerMutator {
+    /// Perform mutation on the desired buffer
+    fn mutate(&self, data: *mut u8, size: usize, max_size: usize) -> usize;
+}
+
+thread_local! {
+    /// The globally accessible mutator reference, if available
+    static MUTATOR: RefCell<Option<Box<dyn ErasedLLVMFuzzerMutator>>> = RefCell::new(None);
+}
+
+/// Mutator which is available for user-defined mutator/crossover
+/// See: [Structure-Aware Fuzzing with libFuzzer](https://github.com/google/fuzzing/blob/master/docs/structure-aware-fuzzing.md)
+#[allow(non_snake_case)]
+#[no_mangle]
+pub extern "C" fn LLVMFuzzerMutate(data: *mut u8, size: usize, max_size: usize) -> usize {
+    MUTATOR.with(|mutator| {
+        if let Ok(mut mutator) = mutator.try_borrow_mut() {
+            if let Some(mutator) = &mut *mutator {
+                return mutator.mutate(data, size, max_size);
+            }
+        }
+        unreachable!("Couldn't get mutator!");
+    })
+}
+
+/// A proxy which wraps a targeted mutator. This is used to provide dynamic access to a global
+/// mutator without knowing the concrete type, which is necessary for custom mutators.
+struct MutatorProxy<'a, M, MT, S> {
+    /// Pointer to the state of the fuzzer
+    state: Rc<RefCell<*mut S>>, // refcell to prevent double-mutability over the pointer
+    /// A weak reference to the mutator to provide to the custom mutator
+    mutator: Weak<RefCell<M>>,
+    /// The result of mutation, to be propagated to the mutational stage
+    result: Rc<RefCell<Result<MutationResult, Error>>>,
+    /// Stage index, which is used by libafl mutator implementations
+    stage_idx: i32,
+    phantom: PhantomData<(&'a mut (), MT)>,
+}
+
+impl<'a, M, MT, S> MutatorProxy<'a, M, MT, S> {
+    /// Crate a new mutator proxy for the given state and mutator
+    fn new(
+        state: &'a mut S,
+        mutator: &Rc<RefCell<M>>,
+        result: &Rc<RefCell<Result<MutationResult, Error>>>,
+        stage_idx: i32,
+    ) -> Self {
+        Self {
+            state: Rc::new(RefCell::new(state)),
+            mutator: Rc::downgrade(mutator),
+            result: result.clone(),
+            stage_idx,
+            phantom: PhantomData,
+        }
+    }
+
+    /// Create a weak version of the proxy, which will become unusable when the custom mutator
+    /// is no longer permitted to be executed.
+    fn weak(
+        &self,
+    ) -> WeakMutatorProxy<impl Fn(&mut dyn for<'b> FnMut(&'b mut S)) -> bool, M, MT, S> {
+        let state = Rc::downgrade(&self.state);
+        WeakMutatorProxy {
+            accessor: move |f: &mut dyn for<'b> FnMut(&'b mut S)| {
+                if let Some(state) = state.upgrade() {
+                    if let Ok(state) = state.try_borrow_mut() {
+                        let state_ref = unsafe { state.as_mut().unwrap_unchecked() };
+                        f(state_ref);
+                        return true;
+                    }
+                }
+                false
+            },
+            mutator: self.mutator.clone(),
+            stage_idx: self.stage_idx,
+            result: self.result.clone(),
+            phantom: PhantomData,
+        }
+    }
+}
+
+/// A weak proxy to the mutators. In order to preserve Rust memory model semantics, we must ensure
+/// that once a libafl mutator exits scope (e.g., once the mutational stage is over) that the
+/// mutator is no longer accessible by the custom mutator.
+#[derive(Clone)]
+struct WeakMutatorProxy<F, M, MT, S> {
+    /// Function which will perform the access to the state.
+    accessor: F,
+    /// A weak reference to the mutator
+    mutator: Weak<RefCell<M>>,
+    /// The stage index to provide to the mutator, when executed.
+    stage_idx: i32,
+    /// The result of mutation, to be propagated to the mutational stage
+    result: Rc<RefCell<Result<MutationResult, Error>>>,
+    phantom: PhantomData<(MT, S)>,
+}
+
+impl<F, M, MT, S> ErasedLLVMFuzzerMutator for WeakMutatorProxy<F, M, MT, S>
+where
+    F: Fn(&mut dyn for<'b> FnMut(&'b mut S)) -> bool,
+    M: ScheduledMutator<BytesInput, MT, S>,
+    MT: MutatorsTuple<BytesInput, S>,
+    S: HasMaxSize + UsesInput<Input = BytesInput>,
+{
+    fn mutate(&self, data: *mut u8, size: usize, max_size: usize) -> usize {
+        let mut new_size = 0; // if access fails, the new len is zero
+        (self.accessor)(&mut |state| {
+            if let Some(mutator) = self.mutator.upgrade() {
+                if let Ok(mut mutator) = mutator.try_borrow_mut() {
+                    let mut intermediary =
+                        BytesInput::from(unsafe { core::slice::from_raw_parts(data, size) });
+                    let old = state.max_size();
+                    state.set_max_size(max_size);
+                    let res = mutator.scheduled_mutate(state, &mut intermediary, self.stage_idx);
+                    state.set_max_size(old);
+                    let succeeded = res.is_ok();
+
+                    let mut result = self.result.deref().borrow_mut();
+                    *result = res;
+                    drop(result);
+
+                    if succeeded {
+                        let target = intermediary.bytes();
+                        if target.as_slice().len() > max_size {
+                            self.result
+                                .replace(Err(Error::illegal_state("Mutation result was too long!")))
+                                .ok();
+                        } else {
+                            let actual = unsafe { core::slice::from_raw_parts_mut(data, max_size) };
+                            actual[..target.as_slice().len()].copy_from_slice(target.as_slice());
+                            new_size = target.as_slice().len();
+                        }
+                    };
+                    return;
+                }
+            }
+            self.result
+                .replace(Err(Error::illegal_state(
+                    "Couldn't borrow mutator while mutating!",
+                )))
+                .ok();
+        });
+        new_size
+    }
+}
+
+/// A mutator which invokes a libFuzzer-like custom mutator or crossover. The `CROSSOVER` constant
+/// controls whether this mutator invokes `LLVMFuzzerCustomMutate` and `LLVMFuzzerCustomCrossover`.
+/// You should avoid using crossover-like mutators with custom mutators as this may lead to the
+/// injection of some input portions to another in ways which violate structure.
+#[derive(Debug)]
+pub struct LLVMCustomMutator<MT, SM, const CROSSOVER: bool> {
+    mutator: Rc<RefCell<SM>>,
+    phantom: PhantomData<MT>,
+}
+
+impl<MT, SM> LLVMCustomMutator<MT, SM, false> {
+    /// Create the mutator which will invoke the custom mutator, emitting an error if the custom mutator is not present
+    ///
+    /// # Safety
+    /// Will create the specified libfuzzer custom mutator `mutate` fn.
+    /// Only safe if the custom mutator implementation is correct.
+    pub unsafe fn mutate(mutator: SM) -> Result<Self, Error> {
+        if libafl_targets_has_libfuzzer_custom_mutator() {
+            Ok(Self::mutate_unchecked(mutator))
+        } else {
+            Err(Error::illegal_state(
+                "Cowardly refusing to create a LLVMFuzzerMutator if a custom mutator is not defined.",
+            ))
+        }
+    }
+
+    /// Create the mutator which will invoke the custom mutator without checking if it exists first
+    ///
+    /// # Safety
+    /// Will create the specified libfuzzer custom mutator and not check if it exists.
+    /// Only safe if the custom mutator implementation is correct and exists.
+    pub unsafe fn mutate_unchecked(mutator: SM) -> Self {
+        LLVMCustomMutator {
+            mutator: Rc::new(RefCell::new(mutator)),
+            phantom: PhantomData,
+        }
+    }
+}
+
+impl<MT, SM> LLVMCustomMutator<MT, SM, true> {
+    /// Create the mutator which will invoke the custom crossover, emitting an error if the custom crossover is not present
+    ///
+    /// # Safety
+    /// Will create the specified libfuzzer custom crossover mutator.
+    /// Only safe if the custom mutator crossover implementation is correct.
+    pub unsafe fn crossover(mutator: SM) -> Result<Self, Error> {
+        if libafl_targets_has_libfuzzer_custom_crossover() {
+            Ok(Self::crossover_unchecked(mutator))
+        } else {
+            Err(Error::illegal_state(
+                "Cowardly refusing to create a LLVMFuzzerMutator if a custom crossover is not defined.",
+            ))
+        }
+    }
+
+    /// Create the mutator which will invoke the custom crossover without checking if it exists first
+    ///
+    /// # Safety
+    /// Will create the specified libfuzzer custom mutator crossover and not check if it exists.
+    /// Only safe if the custom mutator crossover implementation is correct and exists.
+    pub unsafe fn crossover_unchecked(mutator: SM) -> Self {
+        LLVMCustomMutator {
+            mutator: Rc::new(RefCell::new(mutator)),
+            phantom: PhantomData,
+        }
+    }
+}
+
+impl<MT, S, SM, const CROSSOVER: bool> ComposedByMutations<BytesInput, MT, S>
+    for LLVMCustomMutator<MT, SM, CROSSOVER>
+where
+    MT: MutatorsTuple<BytesInput, S>,
+    S: UsesInput<Input = BytesInput> + HasRand + HasMaxSize,
+    SM: ScheduledMutator<BytesInput, MT, S>,
+{
+    fn mutations(&self) -> &MT {
+        unimplemented!("It is unsafe to provide reference-based access to the mutators as they are behind a RefCell.")
+    }
+
+    fn mutations_mut(&mut self) -> &mut MT {
+        unimplemented!("It is unsafe to provide reference-based access to the mutators as they are behind a RefCell.")
+    }
+}
+
+impl<MT, SM> Named for LLVMCustomMutator<MT, SM, false> {
+    fn name(&self) -> &str {
+        "LLVMCustomMutator"
+    }
+}
+
+impl<MT, S, SM> Mutator<BytesInput, S> for LLVMCustomMutator<MT, SM, false>
+where
+    MT: MutatorsTuple<BytesInput, S> + 'static,
+    S: UsesInput<Input = BytesInput> + HasRand + HasMaxSize + 'static,
+    SM: ScheduledMutator<BytesInput, MT, S> + 'static,
+{
+    #[inline]
+    fn mutate(
+        &mut self,
+        state: &mut S,
+        input: &mut S::Input,
+        stage_idx: i32,
+    ) -> Result<MutationResult, Error> {
+        self.scheduled_mutate(state, input, stage_idx)
+    }
+}
+
+impl<MT, S, SM> ScheduledMutator<BytesInput, MT, S> for LLVMCustomMutator<MT, SM, false>
+where
+    SM: ScheduledMutator<BytesInput, MT, S> + 'static,
+    MT: MutatorsTuple<BytesInput, S> + 'static,
+    S: UsesInput<Input = BytesInput> + HasRand + HasMaxSize + 'static,
+{
+    fn iterations(&self, state: &mut S, input: &S::Input) -> u64 {
+        let mutator = self.mutator.deref().borrow();
+        mutator.iterations(state, input)
+    }
+
+    fn schedule(&self, state: &mut S, input: &S::Input) -> MutationId {
+        let mutator = self.mutator.deref().borrow();
+        mutator.schedule(state, input)
+    }
+
+    fn scheduled_mutate(
+        &mut self,
+        state: &mut S,
+        input: &mut S::Input,
+        stage_idx: i32,
+    ) -> Result<MutationResult, Error> {
+        let seed = state.rand_mut().next();
+        let target = input.bytes();
+        let mut bytes = Vec::with_capacity(state.max_size());
+        bytes.extend_from_slice(target.as_slice());
+        bytes.resize(state.max_size(), 0);
+
+        // we assume that the fuzzer did not use this mutator, but instead utilised their own
+        let result = Rc::new(RefCell::new(Ok(MutationResult::Mutated)));
+        let proxy = MutatorProxy::new(state, &self.mutator, &result, stage_idx);
+        let old = MUTATOR.with(|mutator| {
+            let mut mutator = mutator.borrow_mut();
+            mutator.replace(Box::new(proxy.weak()))
+        });
+        let new_size = unsafe {
+            libafl_targets_libfuzzer_custom_mutator(
+                bytes.as_mut_ptr(),
+                target.as_slice().len(),
+                bytes.len(),
+                seed as u32,
+            )
+        };
+        drop(proxy);
+        MUTATOR.with(|mutator| {
+            let mut mutator = mutator.borrow_mut();
+            *mutator = old;
+        });
+        if result.deref().borrow().is_err() {
+            return result.replace(Ok(MutationResult::Skipped));
+        }
+        bytes.truncate(new_size);
+        core::mem::swap(input.bytes_mut(), &mut bytes);
+        Ok(MutationResult::Mutated)
+    }
+}
+
+impl<MT, SM> Named for LLVMCustomMutator<MT, SM, true> {
+    fn name(&self) -> &str {
+        "LLVMCustomCrossover"
+    }
+}
+
+impl<MT, S, SM> Mutator<BytesInput, S> for LLVMCustomMutator<MT, SM, true>
+where
+    MT: MutatorsTuple<BytesInput, S> + 'static,
+    S: UsesInput<Input = BytesInput> + HasRand + HasMaxSize + HasCorpus + 'static,
+    SM: ScheduledMutator<BytesInput, MT, S> + 'static,
+{
+    #[inline]
+    fn mutate(
+        &mut self,
+        state: &mut S,
+        input: &mut S::Input,
+        stage_idx: i32,
+    ) -> Result<MutationResult, Error> {
+        self.scheduled_mutate(state, input, stage_idx)
+    }
+}
+
+impl<MT, S, SM> ScheduledMutator<BytesInput, MT, S> for LLVMCustomMutator<MT, SM, true>
+where
+    SM: ScheduledMutator<BytesInput, MT, S> + 'static,
+    MT: MutatorsTuple<BytesInput, S> + 'static,
+    S: UsesInput<Input = BytesInput> + HasRand + HasMaxSize + HasCorpus + 'static,
+{
+    fn iterations(&self, state: &mut S, input: &S::Input) -> u64 {
+        let mutator = self.mutator.deref().borrow();
+        mutator.iterations(state, input)
+    }
+
+    fn schedule(&self, state: &mut S, input: &S::Input) -> MutationId {
+        let mutator = self.mutator.deref().borrow();
+        mutator.schedule(state, input)
+    }
+
+    fn scheduled_mutate(
+        &mut self,
+        state: &mut S,
+        input: &mut S::Input,
+        stage_idx: i32,
+    ) -> Result<MutationResult, Error> {
+        // We don't want to use the testcase we're already using for splicing
+        let idx = random_corpus_id!(state.corpus(), state.rand_mut());
+        if let Some(cur) = state.corpus().current() {
+            if idx == *cur {
+                return Ok(MutationResult::Skipped);
+            }
+        }
+
+        let mut other_testcase = state.corpus().get(idx)?.borrow_mut();
+        let other = other_testcase.load_input(state.corpus())?;
+        let data2 = Vec::from(other.bytes());
+        drop(other_testcase);
+
+        let seed = state.rand_mut().next();
+        let mut out = vec![0u8; state.max_size()];
+        let data1 = input.bytes();
+
+        // we assume that the fuzzer did not use this mutator, but instead utilised their own
+        let result = Rc::new(RefCell::new(Ok(MutationResult::Mutated)));
+        let proxy = MutatorProxy::new(state, &self.mutator, &result, stage_idx);
+        let old = MUTATOR.with(|mutator| {
+            let mut mutator = mutator.borrow_mut();
+            mutator.replace(Box::new(proxy.weak()))
+        });
+        let new_size = unsafe {
+            libafl_targets_libfuzzer_custom_crossover(
+                data1.as_ptr(),
+                data1.len(),
+                data2.as_ptr(),
+                data2.len(),
+                out.as_mut_ptr(),
+                out.len(),
+                seed as u32,
+            )
+        };
+        drop(proxy);
+        MUTATOR.with(|mutator| {
+            let mut mutator = mutator.borrow_mut();
+            *mutator = old;
+        });
+        if result.deref().borrow().is_err() {
+            return result.replace(Ok(MutationResult::Skipped));
+        }
+        out.truncate(new_size);
+        core::mem::swap(input.bytes_mut(), &mut out);
+        Ok(MutationResult::Mutated)
+    }
+}

libafl_targets/src/libfuzzer/observers/mod.rs

@@ -0,0 +1,4 @@
+#[cfg(feature = "libfuzzer_oom")]
+mod oom;
+#[cfg(feature = "libfuzzer_oom")]
+pub use oom::*;

libafl_targets/src/libfuzzer/observers/oom.rs

@@ -0,0 +1,168 @@
+use core::{ffi::c_void, fmt::Debug};
+use std::sync::atomic::{AtomicBool, AtomicUsize, Ordering};
+
+use libafl::{
+    events::EventFirer,
+    executors::ExitKind,
+    feedbacks::Feedback,
+    inputs::UsesInput,
+    observers::{Observer, ObserversTuple},
+    state::HasClientPerfMonitor,
+    Error,
+};
+use libafl_bolts::Named;
+use libc::SIGABRT;
+use serde::{Deserialize, Serialize};
+
+extern "C" {
+    fn libafl_check_malloc_size(ptr: *const c_void) -> usize;
+}
+
+static RUNNING: AtomicBool = AtomicBool::new(false);
+static OOMED: AtomicBool = AtomicBool::new(false);
+static RSS_MAX: AtomicUsize = AtomicUsize::new(2 << 30);
+// 2GB, which is the default
+static MALLOC_MAX: AtomicUsize = AtomicUsize::new(2 << 30);
+
+static MALLOC_SIZE: AtomicUsize = AtomicUsize::new(0);
+
+/// malloc hook which will be invoked if address sanitizer is present. Used to detect if the target makes a malloc call
+/// that will exceed the permissible size
+///
+/// # Safety
+/// Is only safe to call with valid freshly allocated pointers backed by allocations of `size`.
+#[no_mangle]
+pub unsafe extern "C" fn __sanitizer_malloc_hook(ptr: *const c_void, size: usize) {
+    if RUNNING.load(Ordering::Relaxed) {
+        let size = match unsafe { libafl_check_malloc_size(ptr) } {
+            0 => size, // either the malloc size function didn't work or it's really zero-sized
+            real => real,
+        };
+
+        let total = MALLOC_SIZE.fetch_add(size, Ordering::Relaxed) + size;
+        if (size > MALLOC_MAX.load(Ordering::Relaxed) || total > RSS_MAX.load(Ordering::Relaxed))
+            && !OOMED.swap(true, Ordering::Relaxed)
+        {
+            unsafe {
+                // we need to kill the process in a way that immediately triggers the crash handler
+                libc::raise(SIGABRT);
+            }
+        }
+    }
+}
+
+/// free hook which will be invoked if ASAN is present. Used to detect if the target makes a malloc call that will
+/// exceed the permissible size
+///
+/// # Safety
+/// Is only safe to call with valid allocated pointers, about to be freed.
+#[no_mangle]
+pub unsafe extern "C" fn __sanitizer_free_hook(ptr: *const c_void) {
+    if RUNNING.load(Ordering::Relaxed) {
+        let size = unsafe { libafl_check_malloc_size(ptr) };
+        MALLOC_SIZE
+            .fetch_update(Ordering::Relaxed, Ordering::Relaxed, |existing| {
+                Some(existing.saturating_sub(size))
+            })
+            .expect("must complete successfully");
+    }
+}
+
+const OOM_OBS_NAME: &str = "libfuzzer-like-oom";
+
+/// Observer which detects if the target would run out of memory or otherwise violate the permissible usage of malloc
+#[derive(Debug, Serialize, Deserialize)]
+pub struct OomObserver {
+    oomed: bool,
+}
+
+impl OomObserver {
+    /// Create a [`OomObserver`] with the provided `rss_max` (total heap size) and `malloc_max` (largest permissible malloc
+    /// allocation size)
+    pub fn new(rss_max: usize, malloc_max: usize) -> Self {
+        RSS_MAX.store(rss_max, Ordering::Relaxed);
+        MALLOC_MAX.store(malloc_max, Ordering::Relaxed);
+        Self { oomed: false }
+    }
+}
+
+impl Named for OomObserver {
+    // strictly one name to prevent two from being registered
+    fn name(&self) -> &str {
+        OOM_OBS_NAME
+    }
+}
+
+impl<S> Observer<S> for OomObserver
+where
+    S: UsesInput,
+{
+    fn pre_exec(&mut self, _state: &mut S, _input: &S::Input) -> Result<(), Error> {
+        OOMED.store(false, Ordering::Relaxed);
+        // must reset for platforms which do not offer malloc tracking
+        MALLOC_SIZE.store(0, Ordering::Relaxed);
+        RUNNING.store(true, Ordering::Relaxed);
+        Ok(())
+    }
+
+    fn post_exec(
+        &mut self,
+        _state: &mut S,
+        _input: &S::Input,
+        _exit_kind: &ExitKind,
+    ) -> Result<(), Error> {
+        RUNNING.store(false, Ordering::Relaxed);
+        self.oomed = OOMED.load(Ordering::Relaxed);
+        Ok(())
+    }
+
+    fn pre_exec_child(&mut self, state: &mut S, input: &S::Input) -> Result<(), Error> {
+        self.pre_exec(state, input)
+    }
+
+    fn post_exec_child(
+        &mut self,
+        state: &mut S,
+        input: &S::Input,
+        exit_kind: &ExitKind,
+    ) -> Result<(), Error> {
+        self.post_exec(state, input, exit_kind)
+    }
+}
+
+/// Feedback for the similarly named [`OomObserver`] to detect if the target crashed due to an observed OOM
+#[derive(Debug, Serialize, Deserialize, Copy, Clone, Default)]
+pub struct OomFeedback;
+
+impl OomFeedback {
+    /// Whether the target OOM'd in the last execution
+    pub fn oomed() -> bool {
+        OOMED.load(Ordering::Relaxed)
+    }
+}
+
+impl Named for OomFeedback {
+    fn name(&self) -> &str {
+        "oom"
+    }
+}
+
+impl<S> Feedback<S> for OomFeedback
+where
+    S: UsesInput + HasClientPerfMonitor,
+{
+    fn is_interesting<EM, OT>(
+        &mut self,
+        _state: &mut S,
+        _manager: &mut EM,
+        _input: &S::Input,
+        _observers: &OT,
+        _exit_kind: &ExitKind,
+    ) -> Result<bool, Error>
+    where
+        EM: EventFirer<State = S>,
+        OT: ObserversTuple<S>,
+    {
+        Ok(Self::oomed())
+    }
+}

libafl_targets/src/sancov_8bit.rs

@@ -1,18 +1,51 @@
 //! [`LLVM` `8-bi-counters`](https://clang.llvm.org/docs/SanitizerCoverage.html#tracing-pcs-with-guards) runtime for `LibAFL`.
 use alloc::vec::Vec;
 
-use libafl_bolts::ownedref::OwnedMutSlice;
+use libafl_bolts::{ownedref::OwnedMutSlice, AsMutSlice, AsSlice};
 
 /// A [`Vec`] of `8-bit-counters` maps for multiple modules.
 /// They are initialized by calling [`__sanitizer_cov_8bit_counters_init`](
 pub static mut COUNTERS_MAPS: Vec<OwnedMutSlice<'static, u8>> = Vec::new();
 
+/// Create more copies of the counters maps
+///
+/// # Safety
+/// You are responsible for ensuring there is no multi-mutability!
+#[must_use]
+pub unsafe fn extra_counters() -> Vec<OwnedMutSlice<'static, u8>> {
+    COUNTERS_MAPS
+        .iter()
+        .map(|counters| {
+            OwnedMutSlice::from_raw_parts_mut(
+                counters.as_slice().as_ptr().cast_mut(),
+                counters.as_slice().len(),
+            )
+        })
+        .collect()
+}
+
 /// Initialize the sancov `8-bit-counters` - usually called by `llvm`.
 #[no_mangle]
 #[allow(clippy::cast_sign_loss)]
 #[allow(clippy::not_unsafe_ptr_arg_deref)]
 pub extern "C" fn __sanitizer_cov_8bit_counters_init(start: *mut u8, stop: *mut u8) {
     unsafe {
+        for existing in &mut COUNTERS_MAPS {
+            let range = existing.as_mut_slice().as_mut_ptr()
+                ..=existing
+                    .as_mut_slice()
+                    .as_mut_ptr()
+                    .add(existing.as_slice().len());
+            if range.contains(&start) || range.contains(&stop) {
+                // we have overlapping or touching ranges; merge them
+                let &start = range.start().min(&start);
+                let &stop = range.end().max(&stop);
+                *existing =
+                    OwnedMutSlice::from_raw_parts_mut(start, stop.offset_from(start) as usize);
+                return;
+            }
+        }
+        // we didn't overlap; keep going
         COUNTERS_MAPS.push(OwnedMutSlice::from_raw_parts_mut(
             start,
             stop.offset_from(start) as usize,

libafl_targets/src/sancov_cmp.c

@@ -6,10 +6,10 @@
 
 #ifdef SANCOV_CMPLOG
   #include "cmplog.h"
+  #include <sanitizer/common_interface_defs.h>
 #endif
 
 void __sanitizer_cov_trace_cmp1(uint8_t arg1, uint8_t arg2) {
-
   uintptr_t k = RETADDR;
   k = (k >> 4) ^ (k << 8);
 
@@ -21,11 +21,9 @@ void __sanitizer_cov_trace_cmp1(uint8_t arg1, uint8_t arg2) {
   k &= CMPLOG_MAP_W - 1;
   __libafl_targets_cmplog(k, 1, (uint64_t)arg1, (uint64_t)arg2);
 #endif
-
 }
 
 void __sanitizer_cov_trace_cmp2(uint16_t arg1, uint16_t arg2) {
-
   uintptr_t k = RETADDR;
   k = (k >> 4) ^ (k << 8);
 
@@ -37,11 +35,9 @@ void __sanitizer_cov_trace_cmp2(uint16_t arg1, uint16_t arg2) {
   k &= CMPLOG_MAP_W - 1;
   __libafl_targets_cmplog(k, 2, (uint64_t)arg1, (uint64_t)arg2);
 #endif
-
 }
 
 void __sanitizer_cov_trace_cmp4(uint32_t arg1, uint32_t arg2) {
-
   uintptr_t k = RETADDR;
   k = (k >> 4) ^ (k << 8);
 
@@ -53,11 +49,9 @@ void __sanitizer_cov_trace_cmp4(uint32_t arg1, uint32_t arg2) {
   k &= CMPLOG_MAP_W - 1;
   __libafl_targets_cmplog(k, 4, (uint64_t)arg1, (uint64_t)arg2);
 #endif
-
 }
 
 void __sanitizer_cov_trace_cmp8(uint64_t arg1, uint64_t arg2) {
-
   uintptr_t k = RETADDR;
   k = (k >> 4) ^ (k << 8);
 
@@ -69,17 +63,14 @@ void __sanitizer_cov_trace_cmp8(uint64_t arg1, uint64_t arg2) {
   k &= CMPLOG_MAP_W - 1;
   __libafl_targets_cmplog(k, 8, (uint64_t)arg1, (uint64_t)arg2);
 #endif
-
 }
 
 void __sanitizer_cov_trace_switch(uint64_t val, uint64_t *cases) {
-
   uintptr_t rt = RETADDR;
 
   // if (!cases[1]) {return;}
 
   for (uint64_t i = 0; i < cases[0]; i++) {
-
     uintptr_t k = rt + i;
     k = (k >> 4) ^ (k << 8);
     // val , cases[i + 2]
@@ -90,10 +81,12 @@ void __sanitizer_cov_trace_switch(uint64_t val, uint64_t *cases) {
         __libafl_targets_value_profile1(k, (uint8_t)val, (uint8_t)cases[i + 2]);
         break;
       case 16:
-        __libafl_targets_value_profile2(k, (uint16_t)val, (uint16_t)cases[i + 2]);
+        __libafl_targets_value_profile2(k, (uint16_t)val,
+                                        (uint16_t)cases[i + 2]);
         break;
       case 32:
-        __libafl_targets_value_profile4(k, (uint32_t)val, (uint32_t)cases[i + 2]);
+        __libafl_targets_value_profile4(k, (uint32_t)val,
+                                        (uint32_t)cases[i + 2]);
         break;
       default:
         __libafl_targets_value_profile8(k, val, cases[i + 2]);
@@ -104,10 +97,7 @@ void __sanitizer_cov_trace_switch(uint64_t val, uint64_t *cases) {
     k &= CMPLOG_MAP_W - 1;
     __libafl_targets_cmplog(k, cases[1] / 8, val, cases[i + 2]);
 #endif
-
-
   }
-
 }
 
 void __sanitizer_cov_trace_const_cmp1(uint8_t arg1, uint8_t arg2) {
@@ -125,3 +115,80 @@ void __sanitizer_cov_trace_const_cmp4(uint32_t arg1, uint32_t arg2) {
 void __sanitizer_cov_trace_const_cmp8(uint64_t arg1, uint64_t arg2) {
   __sanitizer_cov_trace_cmp8(arg1, arg2);
 }
+
+#ifdef SANCOV_CMPLOG
+
+void __sanitizer_weak_hook_memcmp(void *called_pc, const void *s1,
+                                  const void *s2, size_t n, int result) {
+  if (result != 0) {
+    uintptr_t k = (uintptr_t)called_pc;
+    k = (k >> 4) ^ (k << 8);
+    k &= CMPLOG_MAP_W - 1;
+
+    __libafl_targets_cmplog_routines_len(k, s1, s2, MIN(n, 32));
+  }
+}
+
+void __sanitizer_weak_hook_strncmp(void *called_pc, const char *s1,
+                                   const char *s2, size_t n, int result) {
+  if (result != 0) {
+    n = MIN(n, 32);
+
+    uintptr_t k = (uintptr_t)called_pc;
+    k = (k >> 4) ^ (k << 8);
+    k &= CMPLOG_MAP_W - 1;
+
+    size_t actual_len;
+    for (actual_len = 0; actual_len < n; actual_len++) {
+      if (s1[actual_len] == 0 || s2[actual_len] == 0) { break; }
+    }
+
+    __libafl_targets_cmplog_routines_len(k, (const uint8_t *) s1, (const uint8_t *) s2, actual_len);
+  }
+}
+
+void __sanitizer_weak_hook_strncasecmp(void *called_pc, const char *s1,
+                                       const char *s2, size_t n, int result) {
+  __sanitizer_weak_hook_strncmp(called_pc, s1, s2, n, result);
+}
+
+void __sanitizer_weak_hook_strcmp(void *called_pc, const char *s1,
+                                  const char *s2, int result) {
+  if (result != 0) {
+    uintptr_t k = (uintptr_t)called_pc;
+    k = (k >> 4) ^ (k << 8);
+    k &= CMPLOG_MAP_W - 1;
+
+    size_t actual_len;
+    for (actual_len = 0; actual_len < 32; actual_len++) {
+      if (s1[actual_len] == 0 || s2[actual_len] == 0) { break; }
+    }
+
+    __libafl_targets_cmplog_routines_len(k, (const uint8_t *) s1, (const uint8_t *) s2, actual_len);
+  }
+}
+
+void __sanitizer_weak_hook_strcasecmp(void *called_pc, const char *s1,
+                                      const char *s2, int result) {
+  __sanitizer_weak_hook_strcmp(called_pc, s1, s2, result);
+}
+
+// strstr, strcasestr, memmem unhandled
+
+#endif
+
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wunused-parameter"
+
+void __sanitizer_cov_pcs_init(const uintptr_t *pcs_beg,
+                              const uintptr_t *pcs_end) {
+  // unused
+  // TODO implement
+}
+
+void __sanitizer_cov_trace_pc_indir(uintptr_t Callee) {
+  // unused
+  // TODO implement
+}
+
+#pragma GCC diagnostic pop

libafl_targets/src/sanitizer_interfaces.h

@@ -0,0 +1,21 @@
+#include <sanitizer/allocator_interface.h>
+#include <sanitizer/asan_interface.h>
+#include <sanitizer/common_interface_defs.h>
+#include <sanitizer/coverage_interface.h>
+#include <sanitizer/dfsan_interface.h>
+#include <sanitizer/hwasan_interface.h>
+#include <sanitizer/lsan_interface.h>
+#include <sanitizer/msan_interface.h>
+#include <sanitizer/scudo_interface.h>
+#include <sanitizer/tsan_interface_atomic.h>
+#include <sanitizer/tsan_interface.h>
+#include <sanitizer/ubsan_interface.h>
+
+#if defined(__linux__)
+  #include <sanitizer/linux_syscall_hooks.h>
+#elif defined(__unix__) || !defined(__APPLE__) && defined(__MACH__)
+  #include <sys/param.h>
+  #if defined(BSD)
+    #include <sanitizer/netbsd_syscall_hooks.h>
+  #endif
+#endif

scripts/clippy.sh

@@ -2,6 +2,8 @@
 SCRIPT_DIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" &> /dev/null && pwd )"
 cd "$SCRIPT_DIR/.." || exit 1
 
+set -e
+
 RUST_BACKTRACE=full cargo +nightly clippy --all --all-features --release --tests --examples --benches -- -Z macro-backtrace \
    -D clippy::all \
    -D clippy::pedantic \
@@ -15,4 +17,22 @@ RUST_BACKTRACE=full cargo +nightly clippy --all --all-features --release --tests
    -A clippy::missing-docs-in-private-items \
    -A clippy::unseparated-literal-suffix \
    -A clippy::module-name-repetitions \
-   -A clippy::unreadable-literal \
+   -A clippy::unreadable-literal
+
+if [[ "$OSTYPE" == "linux-gnu"* ]]; then
+  cd libafl_libfuzzer/libafl_libfuzzer_runtime
+  RUST_BACKTRACE=full cargo +nightly clippy --all --all-features --release --tests --examples --benches -- -Z macro-backtrace \
+     -D clippy::all \
+     -D clippy::pedantic \
+     -W clippy::similar_names \
+     -A clippy::type_repetition_in_bounds \
+     -A clippy::missing-errors-doc \
+     -A clippy::cast-possible-truncation \
+     -A clippy::used-underscore-binding \
+     -A clippy::ptr-as-ptr \
+     -A clippy::missing-panics-doc \
+     -A clippy::missing-docs-in-private-items \
+     -A clippy::unseparated-literal-suffix \
+     -A clippy::module-name-repetitions \
+     -A clippy::unreadable-literal
+fi