libafl_bolts: rands super mega ultra giga house cleaning of doom (#2123)

* rands: simpler rand_trait code, remove useless test

* rands: provide and use proper random_seed()

* rands: add missing golden tests

* Don't use current_nanos() for seeding

* rands: remove RandomSeed trait

docs/listings/baby_fuzzer/listing-04/src/main.rs

@@ -15,7 +15,7 @@ use libafl::{
     schedulers::QueueScheduler,
     state::StdState,
 };
-use libafl_bolts::{current_nanos, rands::StdRand, tuples::tuple_list, AsSlice};
+use libafl_bolts::{rands::StdRand, tuples::tuple_list, AsSlice};
 /* ANCHOR_END: use */
 
 fn main() {
@@ -40,7 +40,7 @@ fn main() {
     // create a State from scratch
     let mut state = StdState::new(
         // RNG
-        StdRand::with_seed(current_nanos()),
+        StdRand::new(),
         // Corpus that will be evolved, we keep it in memory for performance
         InMemoryCorpus::new(),
         // Corpus in which we store solutions (crashes in this example),
@@ -71,13 +71,7 @@ fn main() {
 
     /* ANCHOR: executor */
     // Create the executor for an in-process function
-    let mut executor = InProcessExecutor::new(
-        &mut harness,
-        (),
-        &mut fuzzer,
-        &mut state,
-        &mut mgr,
-    )
+    let mut executor = InProcessExecutor::new(&mut harness, (), &mut fuzzer, &mut state, &mut mgr)
         .expect("Failed to create the Executor");
     /* ANCHOR_END: executor */
 

docs/listings/baby_fuzzer/listing-05/src/main.rs

@@ -15,7 +15,7 @@ use libafl::{
     schedulers::QueueScheduler,
     state::StdState,
 };
-use libafl_bolts::{current_nanos, rands::StdRand, tuples::tuple_list, AsSlice};
+use libafl_bolts::{rands::StdRand, tuples::tuple_list, AsSlice};
 use std::path::PathBuf;
 /* ANCHOR_END: use */
 
@@ -65,7 +65,7 @@ fn main() {
     // create a State from scratch
     let mut state = StdState::new(
         // RNG
-        StdRand::with_seed(current_nanos()),
+        StdRand::new(),
         // Corpus that will be evolved, we keep it in memory for performance
         InMemoryCorpus::new(),
         // Corpus in which we store solutions (crashes in this example),

docs/listings/baby_fuzzer/listing-06/src/main.rs

@@ -17,7 +17,7 @@ use libafl::{
     stages::mutational::StdMutationalStage,
     state::StdState,
 };
-use libafl_bolts::{current_nanos, rands::StdRand, tuples::tuple_list, AsSlice};
+use libafl_bolts::{rands::StdRand, tuples::tuple_list, AsSlice};
 use std::path::PathBuf;
 /* ANCHOR_END: use */
 
@@ -62,7 +62,7 @@ fn main() {
     // create a State from scratch
     let mut state = StdState::new(
         // RNG
-        StdRand::with_seed(current_nanos()),
+        StdRand::new(),
         // Corpus that will be evolved, we keep it in memory for performance
         InMemoryCorpus::new(),
         // Corpus in which we store solutions (crashes in this example),

fuzzers/baby_fuzzer_gramatron/src/main.rs

@@ -24,7 +24,7 @@ use libafl::{
     stages::mutational::StdMutationalStage,
     state::StdState,
 };
-use libafl_bolts::{current_nanos, rands::StdRand, tuples::tuple_list};
+use libafl_bolts::{rands::StdRand, tuples::tuple_list};
 
 /// Coverage map with explicit assignments due to the lack of instrumentation
 static mut SIGNALS: [u8; 16] = [0; 16];
@@ -69,7 +69,7 @@ pub fn main() {
     // create a State from scratch
     let mut state = StdState::new(
         // RNG
-        StdRand::with_seed(current_nanos()),
+        StdRand::new(),
         // Corpus that will be evolved, we keep it in memory for performance
         InMemoryCorpus::new(),
         // Corpus in which we store solutions (crashes in this example),

fuzzers/baby_fuzzer_grimoire/src/main.rs

@@ -21,7 +21,7 @@ use libafl::{
     state::StdState,
     HasMetadata,
 };
-use libafl_bolts::{current_nanos, rands::StdRand, tuples::tuple_list, AsSlice};
+use libafl_bolts::{rands::StdRand, tuples::tuple_list, AsSlice};
 
 /// Coverage map with explicit assignments due to the lack of instrumentation
 static mut SIGNALS: [u8; 16] = [0; 16];
@@ -95,7 +95,7 @@ pub fn main() {
     // create a State from scratch
     let mut state = StdState::new(
         // RNG
-        StdRand::with_seed(current_nanos()),
+        StdRand::new(),
         // Corpus that will be evolved, we keep it in memory for performance
         InMemoryCorpus::new(),
         // Corpus in which we store solutions (crashes in this example),

fuzzers/baby_fuzzer_minimizing/src/main.rs

@@ -55,7 +55,7 @@ pub fn main() -> Result<(), Error> {
     // create a State from scratch
     let mut state = StdState::new(
         // RNG
-        StdRand::with_seed(current_nanos()),
+        StdRand::new(),
         // Corpus that will be evolved, we keep it in memory for performance
         InMemoryOnDiskCorpus::new(corpus_dir).unwrap(),
         // Corpus in which we store solutions (crashes in this example),
@@ -108,7 +108,7 @@ pub fn main() -> Result<(), Error> {
     let minimized_dir = PathBuf::from("./minimized");
 
     let mut state = StdState::new(
-        StdRand::with_seed(current_nanos()),
+        StdRand::new(),
         InMemoryOnDiskCorpus::new(minimized_dir).unwrap(),
         InMemoryCorpus::new(),
         &mut (),

fuzzers/baby_fuzzer_multi/src/main.rs

@@ -21,7 +21,7 @@ use libafl::{
     state::StdState,
     Evaluator,
 };
-use libafl_bolts::{current_nanos, rands::StdRand, tuples::tuple_list, AsSlice};
+use libafl_bolts::{rands::StdRand, tuples::tuple_list, AsSlice};
 
 /// Coverage map with explicit assignments due to the lack of instrumentation
 static mut SIGNALS: [u8; 128] = [0; 128];
@@ -100,7 +100,7 @@ pub fn main() {
     // create a State from scratch
     let mut state = StdState::new(
         // RNG
-        StdRand::with_seed(current_nanos()),
+        StdRand::new(),
         // Corpus that will be evolved, we keep it in memory for performance
         InMemoryCorpus::new(),
         // Corpus in which we store solutions (crashes in this example),

fuzzers/baby_fuzzer_nautilus/src/main.rs

@@ -21,7 +21,7 @@ use libafl::{
     state::StdState,
     HasMetadata,
 };
-use libafl_bolts::{current_nanos, rands::StdRand, tuples::tuple_list};
+use libafl_bolts::{rands::StdRand, tuples::tuple_list};
 
 /// Coverage map with explicit assignments due to the lack of instrumentation
 static mut SIGNALS: [u8; 16] = [0; 16];
@@ -62,7 +62,7 @@ pub fn main() {
     // create a State from scratch
     let mut state = StdState::new(
         // RNG
-        StdRand::with_seed(current_nanos()),
+        StdRand::new(),
         // Corpus that will be evolved, we keep it in memory for performance
         InMemoryCorpus::new(),
         // Corpus in which we store solutions (crashes in this example),

fuzzers/baby_fuzzer_swap_differential/src/main.rs

@@ -23,7 +23,7 @@ use libafl::{
     stages::mutational::StdMutationalStage,
     state::{HasSolutions, StdState},
 };
-use libafl_bolts::{current_nanos, rands::StdRand, tuples::tuple_list, AsSlice};
+use libafl_bolts::{rands::StdRand, tuples::tuple_list, AsSlice};
 use libafl_targets::{edges_max_num, DifferentialAFLMapSwapObserver};
 #[cfg(not(miri))]
 use mimalloc::MiMalloc;
@@ -186,7 +186,7 @@ pub fn main() {
     // create a State from scratch
     let mut state = StdState::new(
         // RNG
-        StdRand::with_seed(current_nanos()),
+        StdRand::new(),
         // Corpus that will be evolved, we keep it in memory for performance
         InMemoryCorpus::new(),
         // Corpus in which we store solutions (crashes in this example),

fuzzers/baby_fuzzer_tokens/src/main.rs

@@ -16,7 +16,7 @@ use libafl::{
     stages::mutational::StdMutationalStage,
     state::StdState,
 };
-use libafl_bolts::{current_nanos, rands::StdRand, tuples::tuple_list};
+use libafl_bolts::{rands::StdRand, tuples::tuple_list};
 
 /// Coverage map with explicit assignments due to the lack of instrumentation
 static mut SIGNALS: [u8; 16] = [0; 16];
@@ -78,7 +78,7 @@ pub fn main() {
     // create a State from scratch
     let mut state = StdState::new(
         // RNG
-        StdRand::with_seed(current_nanos()),
+        StdRand::new(),
         // Corpus that will be evolved, we keep it in memory for performance
         InMemoryCorpus::new(),
         // Corpus in which we store solutions (crashes in this example),

fuzzers/baby_fuzzer_unicode/src/main.rs

@@ -20,7 +20,7 @@ use libafl::{
     state::StdState,
     Evaluator,
 };
-use libafl_bolts::{current_nanos, rands::StdRand, tuples::tuple_list, AsSlice};
+use libafl_bolts::{rands::StdRand, tuples::tuple_list, AsSlice};
 
 /// Coverage map with explicit assignments due to the lack of instrumentation
 static mut SIGNALS: [u8; 64] = [0; 64];
@@ -67,7 +67,7 @@ pub fn main() {
     // create a State from scratch
     let mut state = StdState::new(
         // RNG
-        StdRand::with_seed(current_nanos()),
+        StdRand::new(),
         // Corpus that will be evolved, we keep it in memory for performance
         InMemoryCorpus::new(),
         // Corpus in which we store solutions (crashes in this example),

fuzzers/baby_fuzzer_wasm/src/lib.rs

@@ -15,9 +15,7 @@ use libafl::{
     state::{HasSolutions, StdState},
     Fuzzer, StdFuzzer,
 };
-use libafl_bolts::{
-    current_nanos, rands::StdRand, serdeany::RegistryBuilder, tuples::tuple_list, AsSlice,
-};
+use libafl_bolts::{rands::StdRand, serdeany::RegistryBuilder, tuples::tuple_list, AsSlice};
 use wasm_bindgen::prelude::*;
 use web_sys::{Performance, Window};
 
@@ -89,7 +87,7 @@ pub fn fuzz() {
     // create a State from scratch
     let mut state = StdState::new(
         // RNG
-        StdRand::with_seed(current_nanos()),
+        StdRand::new(),
         // Corpus that will be evolved, we keep it in memory for performance
         InMemoryCorpus::new(),
         // In a "real" fuzzing campaign, you should stash solutions in a JS array instead

fuzzers/baby_fuzzer_with_forkexecutor/src/main.rs

@@ -18,7 +18,6 @@ use libafl::{
     state::StdState,
 };
 use libafl_bolts::{
-    current_nanos,
     rands::StdRand,
     shmem::{unix_shmem, ShMemProvider},
     tuples::tuple_list,
@@ -76,7 +75,7 @@ pub fn main() {
     // create a State from scratch
     let mut state = StdState::new(
         // RNG
-        StdRand::with_seed(current_nanos()),
+        StdRand::new(),
         // Corpus that will be evolved, we keep it in memory for performance
         InMemoryCorpus::new(),
         // Corpus in which we store solutions (crashes in this example),

fuzzers/baby_no_std/src/main.rs

@@ -25,7 +25,7 @@ use libafl::{
     stages::mutational::StdMutationalStage,
     state::StdState,
 };
-use libafl_bolts::{current_nanos, rands::StdRand, tuples::tuple_list, AsSlice};
+use libafl_bolts::{rands::StdRand, tuples::tuple_list, AsSlice};
 #[cfg(any(windows, unix))]
 use libc::{abort, printf};
 use static_alloc::Bump;
@@ -98,7 +98,7 @@ pub extern "C" fn main(_argc: isize, _argv: *const *const u8) -> isize {
     // create a State from scratch
     let mut state = StdState::new(
         // RNG
-        StdRand::with_seed(current_nanos()),
+        StdRand::new(),
         // Corpus that will be evolved, we keep it in memory for performance
         InMemoryCorpus::new(),
         // Corpus in which we store solutions (crashes in this example),

fuzzers/backtrace_baby_fuzzers/c_code_with_fork_executor/src/main.rs

@@ -17,7 +17,6 @@ use libafl::{
     state::StdState,
 };
 use libafl_bolts::{
-    current_nanos,
     ownedref::OwnedRefMut,
     rands::StdRand,
     shmem::{ShMemProvider, StdShMemProvider},
@@ -64,7 +63,7 @@ pub fn main() {
     // create a State from scratch
     let mut state = StdState::new(
         // RNG
-        StdRand::with_seed(current_nanos()),
+        StdRand::new(),
         // Corpus that will be evolved, we keep it in memory for performance
         InMemoryCorpus::new(),
         // Corpus in which we store solutions (crashes in this example),

fuzzers/backtrace_baby_fuzzers/c_code_with_inprocess_executor/src/main.rs

@@ -16,7 +16,7 @@ use libafl::{
     stages::mutational::StdMutationalStage,
     state::StdState,
 };
-use libafl_bolts::{current_nanos, rands::StdRand, tuples::tuple_list, AsSlice};
+use libafl_bolts::{rands::StdRand, tuples::tuple_list, AsSlice};
 use libc::c_uchar;
 extern crate libc;
 
@@ -51,7 +51,7 @@ pub fn main() {
     // create a State from scratch
     let mut state = StdState::new(
         // RNG
-        StdRand::with_seed(current_nanos()),
+        StdRand::new(),
         // Corpus that will be evolved, we keep it in memory for performance
         InMemoryCorpus::new(),
         // Corpus in which we store solutions (crashes in this example),

fuzzers/backtrace_baby_fuzzers/command_executor/src/main.rs

@@ -25,7 +25,6 @@ use libafl::{
     Error,
 };
 use libafl_bolts::{
-    current_nanos,
     rands::StdRand,
     shmem::{unix_shmem, ShMem, ShMemId, ShMemProvider},
     tuples::tuple_list,
@@ -53,7 +52,7 @@ pub fn main() {
     // create a State from scratch
     let mut state = StdState::new(
         // RNG
-        StdRand::with_seed(current_nanos()),
+        StdRand::new(),
         // Corpus that will be evolved, we keep it in memory for performance
         InMemoryCorpus::new(),
         // Corpus in which we store solutions (crashes in this example),

fuzzers/backtrace_baby_fuzzers/forkserver_executor/src/main.rs

@@ -21,7 +21,6 @@ use libafl_bolts::shmem::StdShMemProvider;
 #[cfg(target_vendor = "apple")]
 use libafl_bolts::shmem::UnixShMemProvider;
 use libafl_bolts::{
-    current_nanos,
     rands::StdRand,
     shmem::{ShMem, ShMemProvider},
     tuples::tuple_list,
@@ -63,7 +62,7 @@ pub fn main() {
     // create a State from scratch
     let mut state = StdState::new(
         // RNG
-        StdRand::with_seed(current_nanos()),
+        StdRand::new(),
         // Corpus that will be evolved, we keep it in memory for performance
         InMemoryCorpus::<BytesInput>::new(),
         // Corpus in which we store solutions (crashes in this example),

fuzzers/backtrace_baby_fuzzers/rust_code_with_fork_executor/src/main.rs

@@ -19,7 +19,6 @@ use libafl::{
     state::StdState,
 };
 use libafl_bolts::{
-    current_nanos,
     ownedref::OwnedRefMut,
     rands::StdRand,
     shmem::{unix_shmem, ShMem, ShMemProvider},
@@ -83,7 +82,7 @@ pub fn main() {
     // create a State from scratch
     let mut state = StdState::new(
         // RNG
-        StdRand::with_seed(current_nanos()),
+        StdRand::new(),
         // Corpus that will be evolved, we keep it in memory for performance
         InMemoryCorpus::new(),
         // Corpus in which we store solutions (crashes in this example),

fuzzers/backtrace_baby_fuzzers/rust_code_with_inprocess_executor/src/main.rs

@@ -18,7 +18,7 @@ use libafl::{
     stages::mutational::StdMutationalStage,
     state::StdState,
 };
-use libafl_bolts::{current_nanos, rands::StdRand, tuples::tuple_list, AsSlice};
+use libafl_bolts::{rands::StdRand, tuples::tuple_list, AsSlice};
 
 /// Coverage map with explicit assignments due to the lack of instrumentation
 static mut SIGNALS: [u8; 16] = [0; 16];
@@ -75,7 +75,7 @@ pub fn main() {
     // create a State from scratch
     let mut state = StdState::new(
         // RNG
-        StdRand::with_seed(current_nanos()),
+        StdRand::new(),
         // Corpus that will be evolved, we keep it in memory for performance
         InMemoryCorpus::new(),
         // Corpus in which we store solutions (crashes in this example),

fuzzers/forkserver_libafl_cc/src/main.rs

@@ -19,7 +19,6 @@ use libafl::{
     HasMetadata,
 };
 use libafl_bolts::{
-    current_nanos,
     rands::StdRand,
     shmem::{ShMem, ShMemProvider, UnixShMemProvider},
     tuples::{tuple_list, MatchNameRef, Merge, Referenceable},
@@ -132,7 +131,7 @@ pub fn main() {
     // create a State from scratch
     let mut state = StdState::new(
         // RNG
-        StdRand::with_seed(current_nanos()),
+        StdRand::new(),
         // Corpus that will be evolved, we keep it in memory for performance
         InMemoryCorpus::<BytesInput>::new(),
         // Corpus in which we store solutions (crashes in this example),

fuzzers/frida_executable_libpng/src/fuzzer.rs

@@ -26,7 +26,6 @@ use libafl::{
 use libafl::{feedback_and_fast, feedbacks::ConstFeedback};
 use libafl_bolts::{
     cli::{parse_args, FuzzerOptions},
-    current_nanos,
     rands::StdRand,
     shmem::{ShMemProvider, StdShMemProvider},
     tuples::{tuple_list, Merge},
@@ -153,7 +152,7 @@ unsafe fn fuzz(
                 let mut state = state.unwrap_or_else(|| {
                     StdState::new(
                         // RNG
-                        StdRand::with_seed(current_nanos()),
+                        StdRand::new(),
                         // Corpus that will be evolved, we keep it in memory for performance
                         CachedOnDiskCorpus::no_meta(PathBuf::from("./corpus_discovered"), 64)
                             .unwrap(),
@@ -271,7 +270,7 @@ unsafe fn fuzz(
                 let mut state = state.unwrap_or_else(|| {
                     StdState::new(
                         // RNG
-                        StdRand::with_seed(current_nanos()),
+                        StdRand::new(),
                         // Corpus that will be evolved, we keep it in memory for performance
                         CachedOnDiskCorpus::no_meta(PathBuf::from("./corpus_discovered"), 64)
                             .unwrap(),
@@ -404,7 +403,7 @@ unsafe fn fuzz(
                 let mut state = state.unwrap_or_else(|| {
                     StdState::new(
                         // RNG
-                        StdRand::with_seed(current_nanos()),
+                        StdRand::new(),
                         // Corpus that will be evolved, we keep it in memory for performance
                         CachedOnDiskCorpus::no_meta(PathBuf::from("./corpus_discovered"), 64)
                             .unwrap(),

fuzzers/frida_gdiplus/src/fuzzer.rs

@@ -36,7 +36,6 @@ use libafl::{
 use libafl::{feedback_and_fast, feedbacks::ConstFeedback};
 use libafl_bolts::{
     cli::{parse_args, FuzzerOptions},
-    current_nanos,
     rands::StdRand,
     shmem::{ShMemProvider, StdShMemProvider},
     tuples::{tuple_list, Merge},
@@ -149,7 +148,7 @@ unsafe fn fuzz(options: &FuzzerOptions) -> Result<(), Error> {
                 let mut state = state.unwrap_or_else(|| {
                     StdState::new(
                         // RNG
-                        StdRand::with_seed(current_nanos()),
+                        StdRand::new(),
                         // Corpus that will be evolved, we keep it in memory for performance
                         CachedOnDiskCorpus::new(PathBuf::from("./corpus_discovered"), 64).unwrap(),
                         // Corpus in which we store solutions (crashes in this example),
@@ -266,7 +265,7 @@ unsafe fn fuzz(options: &FuzzerOptions) -> Result<(), Error> {
                 let mut state = state.unwrap_or_else(|| {
                     StdState::new(
                         // RNG
-                        StdRand::with_seed(current_nanos()),
+                        StdRand::new(),
                         // Corpus that will be evolved, we keep it in memory for performance
                         CachedOnDiskCorpus::no_meta(PathBuf::from("./corpus_discovered"), 64)
                             .unwrap(),
@@ -401,7 +400,7 @@ unsafe fn fuzz(options: &FuzzerOptions) -> Result<(), Error> {
                 let mut state = state.unwrap_or_else(|| {
                     StdState::new(
                         // RNG
-                        StdRand::with_seed(current_nanos()),
+                        StdRand::new(),
                         // Corpus that will be evolved, we keep it in memory for performance
                         CachedOnDiskCorpus::no_meta(PathBuf::from("./corpus_discovered"), 64)
                             .unwrap(),

fuzzers/frida_libpng/src/fuzzer.rs

@@ -26,7 +26,6 @@ use libafl::{
 use libafl::{feedback_and_fast, feedbacks::ConstFeedback};
 use libafl_bolts::{
     cli::{parse_args, FuzzerOptions},
-    current_nanos,
     rands::StdRand,
     shmem::{ShMemProvider, StdShMemProvider},
     tuples::{tuple_list, Merge},
@@ -143,7 +142,7 @@ unsafe fn fuzz(options: &FuzzerOptions) -> Result<(), Error> {
                 let mut state = state.unwrap_or_else(|| {
                     StdState::new(
                         // RNG
-                        StdRand::with_seed(current_nanos()),
+                        StdRand::new(),
                         // Corpus that will be evolved, we keep it in memory for performance
                         CachedOnDiskCorpus::no_meta(PathBuf::from("./corpus_discovered"), 64)
                             .unwrap(),
@@ -262,7 +261,7 @@ unsafe fn fuzz(options: &FuzzerOptions) -> Result<(), Error> {
                 let mut state = state.unwrap_or_else(|| {
                     StdState::new(
                         // RNG
-                        StdRand::with_seed(current_nanos()),
+                        StdRand::new(),
                         // Corpus that will be evolved, we keep it in memory for performance
                         CachedOnDiskCorpus::no_meta(PathBuf::from("./corpus_discovered"), 64)
                             .unwrap(),
@@ -395,7 +394,7 @@ unsafe fn fuzz(options: &FuzzerOptions) -> Result<(), Error> {
                 let mut state = state.unwrap_or_else(|| {
                     StdState::new(
                         // RNG
-                        StdRand::with_seed(current_nanos()),
+                        StdRand::new(),
                         // Corpus that will be evolved, we keep it in memory for performance
                         CachedOnDiskCorpus::no_meta(PathBuf::from("./corpus_discovered"), 64)
                             .unwrap(),

fuzzers/fuzzbench/src/lib.rs

@@ -40,7 +40,7 @@ use libafl::{
     Error, HasMetadata,
 };
 use libafl_bolts::{
-    current_nanos, current_time,
+    current_time,
     os::dup2,
     rands::StdRand,
     shmem::{ShMemProvider, StdShMemProvider},
@@ -270,7 +270,7 @@ fn fuzz(
     let mut state = state.unwrap_or_else(|| {
         StdState::new(
             // RNG
-            StdRand::with_seed(current_nanos()),
+            StdRand::new(),
             // Corpus that will be evolved, we keep it in memory for performance
             InMemoryOnDiskCorpus::new(corpus_dir).unwrap(),
             // Corpus in which we store solutions (crashes in this example),

fuzzers/fuzzbench_ctx/src/lib.rs

@@ -43,7 +43,7 @@ use libafl::{
     Error, HasMetadata,
 };
 use libafl_bolts::{
-    current_nanos, current_time,
+    current_time,
     os::dup2,
     ownedref::OwnedMutSlice,
     rands::StdRand,
@@ -280,7 +280,7 @@ fn fuzz(
     let mut state = state.unwrap_or_else(|| {
         StdState::new(
             // RNG
-            StdRand::with_seed(current_nanos()),
+            StdRand::new(),
             // Corpus that will be evolved, we keep it in memory for performance
             InMemoryOnDiskCorpus::new(corpus_dir).unwrap(),
             // Corpus in which we store solutions (crashes in this example),

fuzzers/fuzzbench_fork_qemu/src/fuzzer.rs

@@ -38,7 +38,7 @@ use libafl::{
     Error, HasMetadata,
 };
 use libafl_bolts::{
-    current_nanos, current_time,
+    current_time,
     os::{dup2, unix_signals::Signal},
     rands::StdRand,
     shmem::{ShMemProvider, StdShMemProvider},
@@ -268,7 +268,7 @@ fn fuzz(
     let mut state = state.unwrap_or_else(|| {
         StdState::new(
             // RNG
-            StdRand::with_seed(current_nanos()),
+            StdRand::new(),
             // Corpus that will be evolved, we keep it in memory for performance
             InMemoryOnDiskCorpus::new(corpus_dir).unwrap(),
             // Corpus in which we store solutions (crashes in this example),

fuzzers/fuzzbench_forkserver/src/main.rs

@@ -35,7 +35,7 @@ use libafl::{
     Error, HasMetadata,
 };
 use libafl_bolts::{
-    current_nanos, current_time,
+    current_time,
     ownedref::OwnedRefMut,
     rands::StdRand,
     shmem::{ShMem, ShMemProvider, UnixShMemProvider},
@@ -276,7 +276,7 @@ fn fuzz(
     // create a State from scratch
     let mut state = StdState::new(
         // RNG
-        StdRand::with_seed(current_nanos()),
+        StdRand::new(),
         // Corpus that will be evolved, we keep it in memory for performance
         InMemoryOnDiskCorpus::<BytesInput>::new(corpus_dir).unwrap(),
         // Corpus in which we store solutions (crashes in this example),

fuzzers/fuzzbench_forkserver_cmplog/src/main.rs

@@ -33,7 +33,7 @@ use libafl::{
     Error, HasMetadata,
 };
 use libafl_bolts::{
-    current_nanos, current_time,
+    current_time,
     ownedref::OwnedRefMut,
     rands::StdRand,
     shmem::{ShMem, ShMemProvider, UnixShMemProvider},
@@ -277,7 +277,7 @@ fn fuzz(
     // create a State from scratch
     let mut state = StdState::new(
         // RNG
-        StdRand::with_seed(current_nanos()),
+        StdRand::new(),
         // Corpus that will be evolved, we keep it in memory for performance
         InMemoryOnDiskCorpus::<BytesInput>::new(corpus_dir).unwrap(),
         // Corpus in which we store solutions (crashes in this example),

fuzzers/fuzzbench_qemu/src/fuzzer.rs

@@ -37,7 +37,7 @@ use libafl::{
     Error, HasMetadata,
 };
 use libafl_bolts::{
-    current_nanos, current_time,
+    current_time,
     os::{dup2, unix_signals::Signal},
     ownedref::OwnedMutSlice,
     rands::StdRand,
@@ -290,7 +290,7 @@ fn fuzz(
     let mut state = state.unwrap_or_else(|| {
         StdState::new(
             // RNG
-            StdRand::with_seed(current_nanos()),
+            StdRand::new(),
             // Corpus that will be evolved, we keep it in memory for performance
             InMemoryOnDiskCorpus::new(corpus_dir).unwrap(),
             // Corpus in which we store solutions (crashes in this example),

fuzzers/fuzzbench_text/src/lib.rs

@@ -46,7 +46,7 @@ use libafl::{
     Error, HasMetadata,
 };
 use libafl_bolts::{
-    current_nanos, current_time,
+    current_time,
     os::dup2,
     rands::StdRand,
     shmem::{ShMemProvider, StdShMemProvider},
@@ -337,7 +337,7 @@ fn fuzz_binary(
     let mut state = state.unwrap_or_else(|| {
         StdState::new(
             // RNG
-            StdRand::with_seed(current_nanos()),
+            StdRand::new(),
             // Corpus that will be evolved, we keep it in memory for performance
             InMemoryOnDiskCorpus::new(corpus_dir).unwrap(),
             // Corpus in which we store solutions (crashes in this example),
@@ -549,7 +549,7 @@ fn fuzz_text(
     let mut state = state.unwrap_or_else(|| {
         StdState::new(
             // RNG
-            StdRand::with_seed(current_nanos()),
+            StdRand::new(),
             // Corpus that will be evolved, we keep it in memory for performance
             InMemoryOnDiskCorpus::new(corpus_dir).unwrap(),
             // Corpus in which we store solutions (crashes in this example),

fuzzers/libafl_atheris/src/lib.rs

@@ -33,7 +33,6 @@ use libafl::{
 };
 use libafl_bolts::{
     core_affinity::Cores,
-    current_nanos,
     rands::StdRand,
     shmem::{ShMemProvider, StdShMemProvider},
     tuples::{tuple_list, Merge},
@@ -161,7 +160,7 @@ pub extern "C" fn LLVMFuzzerRunDriver(
         let mut state = state.unwrap_or_else(|| {
             StdState::new(
                 // RNG
-                StdRand::with_seed(current_nanos()),
+                StdRand::new(),
                 // Corpus that will be evolved, we keep it in memory for performance
                 InMemoryCorpus::new(),
                 // Corpus in which we store solutions (crashes in this example),

fuzzers/libfuzzer_libmozjpeg/src/lib.rs

@@ -26,7 +26,6 @@ use libafl::{
     Error, HasMetadata,
 };
 use libafl_bolts::{
-    current_nanos,
     rands::StdRand,
     tuples::{tuple_list, Merge},
     AsSlice,
@@ -100,7 +99,7 @@ fn fuzz(corpus_dirs: &[PathBuf], objective_dir: PathBuf, broker_port: u16) -> Re
     let mut state = state.unwrap_or_else(|| {
         StdState::new(
             // RNG
-            StdRand::with_seed(current_nanos()),
+            StdRand::new(),
             // Corpus that will be evolved, we keep it in memory for performance
             InMemoryCorpus::new(),
             // Corpus in which we store solutions (crashes in this example),

fuzzers/libfuzzer_libpng/src/lib.rs

@@ -27,7 +27,6 @@ use libafl::{
     Error, HasMetadata,
 };
 use libafl_bolts::{
-    current_nanos,
     rands::StdRand,
     tuples::{tuple_list, Merge},
     AsSlice,
@@ -111,7 +110,7 @@ fn fuzz(corpus_dirs: &[PathBuf], objective_dir: PathBuf, broker_port: u16) -> Re
     let mut state = state.unwrap_or_else(|| {
         StdState::new(
             // RNG
-            StdRand::with_seed(current_nanos()),
+            StdRand::new(),
             // Corpus that will be evolved, we keep it in memory for performance
             InMemoryCorpus::new(),
             // Corpus in which we store solutions (crashes in this example),

fuzzers/libfuzzer_libpng_accounting/src/lib.rs

@@ -27,7 +27,6 @@ use libafl::{
 };
 use libafl_bolts::{
     core_affinity::Cores,
-    current_nanos,
     rands::StdRand,
     shmem::{ShMemProvider, StdShMemProvider},
     tuples::{tuple_list, Merge},
@@ -163,7 +162,7 @@ pub extern "C" fn libafl_main() {
         let mut state = state.unwrap_or_else(|| {
             StdState::new(
                 // RNG
-                StdRand::with_seed(current_nanos()),
+                StdRand::new(),
                 // Corpus that will be evolved, we keep it in memory for performance
                 InMemoryCorpus::new(),
                 // Corpus in which we store solutions (crashes in this example),

fuzzers/libfuzzer_libpng_aflpp_ui/src/lib.rs

@@ -27,7 +27,6 @@ use libafl::{
     Error, HasMetadata,
 };
 use libafl_bolts::{
-    current_nanos,
     rands::StdRand,
     tuples::{tuple_list, Merge},
     AsSlice,
@@ -125,7 +124,7 @@ fn fuzz(
     let mut state = state.unwrap_or_else(|| {
         StdState::new(
             // RNG
-            StdRand::with_seed(current_nanos()),
+            StdRand::new(),
             // Corpus that will be evolved, we keep it in memory for performance
             InMemoryOnDiskCorpus::new(corpus_dir).unwrap(),
             // Corpus in which we store solutions (crashes in this example),

fuzzers/libfuzzer_libpng_centralized/src/lib.rs

@@ -27,7 +27,6 @@ use libafl::{
 };
 use libafl_bolts::{
     core_affinity::{CoreId, Cores},
-    current_nanos,
     rands::StdRand,
     shmem::{ShMemProvider, StdShMemProvider},
     tuples::{tuple_list, Merge},
@@ -160,7 +159,7 @@ pub extern "C" fn libafl_main() {
         let mut state = state.unwrap_or_else(|| {
             StdState::new(
                 // RNG
-                StdRand::with_seed(current_nanos()),
+                StdRand::new(),
                 // Corpus that will be evolved, we keep it in memory for performance
                 InMemoryCorpus::new(),
                 // Corpus in which we store solutions (crashes in this example),

fuzzers/libfuzzer_libpng_cmin/src/lib.rs

@@ -30,7 +30,6 @@ use libafl::{
     Error, HasMetadata,
 };
 use libafl_bolts::{
-    current_nanos,
     rands::StdRand,
     tuples::{tuple_list, Merge},
     AsSlice,
@@ -110,7 +109,7 @@ fn fuzz(corpus_dirs: &[PathBuf], objective_dir: PathBuf, broker_port: u16) -> Re
     let mut state = state.unwrap_or_else(|| {
         StdState::new(
             // RNG
-            StdRand::with_seed(current_nanos()),
+            StdRand::new(),
             // Corpus that will be evolved, we keep it in memory for performance
             InMemoryCorpus::new(),
             // Corpus in which we store solutions (crashes in this example),

fuzzers/libfuzzer_libpng_launcher/src/lib.rs

@@ -27,7 +27,6 @@ use libafl::{
 };
 use libafl_bolts::{
     core_affinity::Cores,
-    current_nanos,
     rands::StdRand,
     shmem::{ShMemProvider, StdShMemProvider},
     tuples::{tuple_list, Merge},
@@ -161,7 +160,7 @@ pub extern "C" fn libafl_main() {
         let mut state = state.unwrap_or_else(|| {
             StdState::new(
                 // RNG
-                StdRand::with_seed(current_nanos()),
+                StdRand::new(),
                 // Corpus that will be evolved, we keep it in memory for performance
                 InMemoryCorpus::new(),
                 // Corpus in which we store solutions (crashes in this example),

fuzzers/libfuzzer_libpng_norestart/src/lib.rs

@@ -31,7 +31,6 @@ use libafl::{
 };
 use libafl_bolts::{
     core_affinity::Cores,
-    current_nanos,
     rands::StdRand,
     shmem::{ShMemProvider, StdShMemProvider},
     tuples::{tuple_list, Merge},
@@ -186,7 +185,7 @@ pub extern "C" fn libafl_main() {
         let mut state = state.unwrap_or_else(|| {
             StdState::new(
                 // RNG
-                StdRand::with_seed(current_nanos()),
+                StdRand::new(),
                 // Corpus that will be evolved, we keep it in memory for performance
                 InMemoryOnDiskCorpus::new(&opt.input[0]).unwrap(),
                 // Corpus in which we store solutions (crashes in this example),

fuzzers/libfuzzer_libpng_tcp_manager/src/lib.rs

@@ -27,7 +27,6 @@ use libafl::{
     Error, HasMetadata,
 };
 use libafl_bolts::{
-    current_nanos,
     rands::StdRand,
     tuples::{tuple_list, Merge},
     AsSlice,
@@ -109,7 +108,7 @@ fn fuzz(corpus_dirs: &[PathBuf], objective_dir: PathBuf, broker_port: u16) -> Re
     let mut state = state.unwrap_or_else(|| {
         StdState::new(
             // RNG
-            StdRand::with_seed(current_nanos()),
+            StdRand::new(),
             // Corpus that will be evolved, we keep it in memory for performance
             InMemoryCorpus::new(),
             // Corpus in which we store solutions (crashes in this example),

fuzzers/libfuzzer_stb_image/src/main.rs

@@ -25,7 +25,7 @@ use libafl::{
     state::{HasCorpus, StdState},
     Error,
 };
-use libafl_bolts::{current_nanos, rands::StdRand, tuples::tuple_list, AsSlice};
+use libafl_bolts::{rands::StdRand, tuples::tuple_list, AsSlice};
 use libafl_targets::{
     libfuzzer_initialize, libfuzzer_test_one_input, std_edges_map_observer, CmpLogObserver,
 };
@@ -91,7 +91,7 @@ fn fuzz(corpus_dirs: &[PathBuf], objective_dir: PathBuf, broker_port: u16) -> Re
     let mut state = state.unwrap_or_else(|| {
         StdState::new(
             // RNG
-            StdRand::with_seed(current_nanos()),
+            StdRand::new(),
             // Corpus that will be evolved, we keep it in memory for performance
             InMemoryCorpus::new(),
             // Corpus in which we store solutions (crashes in this example),

fuzzers/libfuzzer_windows_asan/src/lib.rs

@@ -20,7 +20,6 @@ use libafl::{
     Error,
 };
 use libafl_bolts::{
-    current_nanos,
     rands::StdRand,
     tuples::{tuple_list, Merge},
     AsSlice,
@@ -87,7 +86,7 @@ fn fuzz(corpus_dirs: &[PathBuf], objective_dir: PathBuf, broker_port: u16) -> Re
     let mut state = state.unwrap_or_else(|| {
         StdState::new(
             // RNG
-            StdRand::with_seed(current_nanos()),
+            StdRand::new(),
             // Corpus that will be evolved, we keep it in memory for performance
             InMemoryCorpus::new(),
             // Corpus in which we store solutions (crashes in this example),

fuzzers/nautilus_sync/src/lib.rs

@@ -28,7 +28,6 @@ use libafl::{
 };
 use libafl_bolts::{
     core_affinity::Cores,
-    current_nanos,
     rands::StdRand,
     shmem::{ShMemProvider, StdShMemProvider},
     tuples::tuple_list,
@@ -159,7 +158,7 @@ pub extern "C" fn libafl_main() {
         let mut state = state.unwrap_or_else(|| {
             StdState::new(
                 // RNG
-                StdRand::with_seed(current_nanos()),
+                StdRand::new(),
                 // Corpus that will be evolved, we keep it in memory for performance
                 InMemoryCorpus::new(),
                 // Corpus in which we store solutions (crashes in this example),

fuzzers/nyx_libxml2_parallel/src/main.rs

@@ -15,7 +15,7 @@ use libafl::{
 };
 use libafl_bolts::{
     core_affinity::{CoreId, Cores},
-    rands::{RandomSeed, StdRand},
+    rands::StdRand,
     shmem::{ShMemProvider, StdShMemProvider},
     tuples::tuple_list,
 };

fuzzers/nyx_libxml2_standalone/src/main.rs

@@ -13,10 +13,7 @@ use libafl::{
     state::StdState,
     Fuzzer, StdFuzzer,
 };
-use libafl_bolts::{
-    rands::{RandomSeed, StdRand},
-    tuples::tuple_list,
-};
+use libafl_bolts::{rands::StdRand, tuples::tuple_list};
 use libafl_nyx::{executor::NyxExecutor, helper::NyxHelper, settings::NyxSettings};
 
 fn main() {

fuzzers/qemu_cmin/src/fuzzer.rs

@@ -20,7 +20,6 @@ use libafl::{
 };
 use libafl_bolts::{
     core_affinity::Cores,
-    current_nanos,
     os::unix_signals::Signal,
     rands::StdRand,
     shmem::{ShMemProvider, StdShMemProvider},
@@ -176,7 +175,7 @@ pub fn fuzz() -> Result<(), Error> {
 
     let mut state = state.unwrap_or_else(|| {
         StdState::new(
-            StdRand::with_seed(current_nanos()),
+            StdRand::new(),
             InMemoryOnDiskCorpus::new(PathBuf::from(options.output)).unwrap(),
             NopCorpus::new(),
             &mut feedback,

fuzzers/qemu_coverage/src/fuzzer.rs

@@ -19,7 +19,6 @@ use libafl::{
 };
 use libafl_bolts::{
     core_affinity::Cores,
-    current_nanos,
     os::unix_signals::Signal,
     rands::StdRand,
     shmem::{ShMemProvider, StdShMemProvider},
@@ -216,7 +215,7 @@ pub fn fuzz() {
 
             let mut state = state.unwrap_or_else(|| {
                 StdState::new(
-                    StdRand::with_seed(current_nanos()),
+                    StdRand::new(),
                     NopCorpus::new(),
                     NopCorpus::new(),
                     &mut feedback,

fuzzers/qemu_launcher/src/instance.rs

@@ -33,7 +33,6 @@ use libafl::{
 use libafl_bolts::shmem::StdShMemProvider;
 use libafl_bolts::{
     core_affinity::CoreId,
-    current_nanos,
     ownedref::OwnedMutSlice,
     rands::StdRand,
     tuples::{tuple_list, Merge},
@@ -110,7 +109,7 @@ impl<'a, M: Monitor> Instance<'a, M> {
             None => {
                 StdState::new(
                     // RNG
-                    StdRand::with_seed(current_nanos()),
+                    StdRand::new(),
                     // Corpus that will be evolved, we keep it in memory for performance
                     InMemoryOnDiskCorpus::no_meta(self.options.queue_dir(self.core_id))?,
                     // Corpus in which we store solutions (crashes in this example),

fuzzers/tinyinst_simple/src/main.rs

@@ -18,10 +18,7 @@ use libafl_bolts::shmem::UnixShMemProvider;
 #[cfg(windows)]
 use libafl_bolts::shmem::Win32ShMemProvider;
 use libafl_bolts::{
-    ownedref::OwnedMutPtr,
-    rands::{RandomSeed, StdRand},
-    shmem::ShMemProvider,
-    tuples::tuple_list,
+    ownedref::OwnedMutPtr, rands::StdRand, shmem::ShMemProvider, tuples::tuple_list,
 };
 use libafl_tinyinst::executor::TinyInstExecutorBuilder;
 static mut COVERAGE: Vec<u64> = vec![];

fuzzers/tutorial/src/lib.rs

@@ -21,7 +21,7 @@ use libafl::{
     state::{HasCorpus, StdState},
     Error, Fuzzer,
 };
-use libafl_bolts::{current_nanos, rands::StdRand, tuples::tuple_list, AsSlice};
+use libafl_bolts::{rands::StdRand, tuples::tuple_list, AsSlice};
 use libafl_targets::{libfuzzer_initialize, libfuzzer_test_one_input, std_edges_map_observer};
 
 mod input;
@@ -108,7 +108,7 @@ fn fuzz(corpus_dirs: &[PathBuf], objective_dir: PathBuf, broker_port: u16) -> Re
     let mut state = state.unwrap_or_else(|| {
         StdState::new(
             // RNG
-            StdRand::with_seed(current_nanos()),
+            StdRand::new(),
             // Corpus that will be evolved, we keep it in memory for performance
             InMemoryCorpus::new(),
             // Corpus in which we store solutions (crashes in this example),

libafl_bolts/src/rands.rs

@@ -1,12 +1,52 @@
 //! The random number generators of `LibAFL`
-use core::{debug_assert, fmt::Debug};
 
-#[cfg(feature = "rand_trait")]
-use rand_core::{impls::fill_bytes_via_next, RngCore};
+use core::{
+    debug_assert,
+    fmt::Debug,
+    sync::atomic::{AtomicUsize, Ordering},
+};
+
 use serde::{de::DeserializeOwned, Deserialize, Serialize};
 
+/// Return a pseudo-random seed. For `no_std` environments, a single deterministic sequence is used.
+#[must_use]
+#[allow(unreachable_code)]
+pub fn random_seed() -> u64 {
+    #[cfg(feature = "std")]
+    return random_seed_from_random_state();
+    #[cfg(all(not(feature = "std"), target_has_atomic = "ptr"))]
+    return random_seed_deterministic();
+    // no_std and no atomics; https://xkcd.com/221/
+    4
+}
+
+static SEED_COUNTER: AtomicUsize = AtomicUsize::new(0);
+
+#[allow(dead_code)]
+#[cfg(target_has_atomic = "ptr")]
+fn random_seed_deterministic() -> u64 {
+    let mut seed = SEED_COUNTER.fetch_add(1, Ordering::Relaxed) as u64;
+    splitmix64(&mut seed)
+}
+
+#[allow(dead_code)]
 #[cfg(feature = "std")]
-use crate::current_nanos;
+fn random_seed_from_random_state() -> u64 {
+    use std::{
+        collections::hash_map::RandomState,
+        hash::{BuildHasher, Hasher},
+    };
+    RandomState::new().build_hasher().finish()
+}
+
+// https://prng.di.unimi.it/splitmix64.c
+fn splitmix64(x: &mut u64) -> u64 {
+    *x = x.wrapping_add(0x9e3779b97f4a7c15);
+    let mut z = *x;
+    z = (z ^ (z >> 30)).wrapping_mul(0xbf58476d1ce4e5b9);
+    z = (z ^ (z >> 27)).wrapping_mul(0x94d049bb133111eb);
+    z ^ (z >> 31)
+}
 
 /// The standard rand implementation for `LibAFL`.
 /// It is usually the right choice, with very good speed and a reasonable randomness.
@@ -101,64 +141,36 @@ pub trait Rand: Debug + Serialize + DeserializeOwned {
     }
 }
 
-// helper macro for deriving Default
-macro_rules! default_rand {
+macro_rules! impl_default_new {
     ($rand: ty) => {
-        /// A default RNG will usually produce a nondeterministic stream of random numbers.
-        /// As we do not have any way to get random seeds for `no_std`, they have to be reproducible there.
-        /// Use [`$rand::with_seed`] to generate a reproducible RNG.
         impl Default for $rand {
-            #[cfg(feature = "std")]
+            /// Creates a generator seeded with [`random_seed`].
             fn default() -> Self {
-                Self::new()
+                Self::with_seed(random_seed())
             }
-            #[cfg(not(feature = "std"))]
-            fn default() -> Self {
-                Self::with_seed(0xAF1)
+        }
+
+        impl $rand {
+            /// Creates a generator seeded with [`random_seed`].
+            #[must_use]
+            pub fn new() -> Self {
+                Self::with_seed(random_seed())
             }
         }
     };
 }
 
-// https://prng.di.unimi.it/splitmix64.c
-fn splitmix64(x: &mut u64) -> u64 {
-    *x = x.wrapping_add(0x9e3779b97f4a7c15);
-    let mut z = *x;
-    z = (z ^ (z >> 30)).wrapping_mul(0xbf58476d1ce4e5b9);
-    z = (z ^ (z >> 27)).wrapping_mul(0x94d049bb133111eb);
-    z ^ (z >> 31)
-}
+impl_default_new!(Xoshiro256PlusPlusRand);
+impl_default_new!(XorShift64Rand);
+impl_default_new!(Lehmer64Rand);
+impl_default_new!(RomuTrioRand);
+impl_default_new!(RomuDuoJrRand);
+impl_default_new!(Sfc64Rand);
 
-// Derive Default by calling `new(DEFAULT_SEED)` on each of the following Rand types.
-default_rand!(Xoshiro256PlusPlusRand);
-default_rand!(XorShift64Rand);
-default_rand!(Lehmer64Rand);
-default_rand!(RomuTrioRand);
-default_rand!(RomuDuoJrRand);
-default_rand!(Sfc64Rand);
-
-/// Initialize Rand types from a source of randomness.
-///
-/// Default implementations are provided with the "std" feature enabled, using system time in
-/// nanoseconds as the initial seed.
-pub trait RandomSeed: Rand + Default {
-    /// Creates a new [`RandomSeed`].
-    fn new() -> Self;
-}
-
-// helper macro to impl RandomSeed
-macro_rules! impl_random {
+macro_rules! impl_rng_core {
     ($rand: ty) => {
-        #[cfg(feature = "std")]
-        impl RandomSeed for $rand {
-            /// Creates a rand instance, pre-seeded with the current time in nanoseconds.
-            fn new() -> Self {
-                Self::with_seed(current_nanos())
-            }
-        }
-
         #[cfg(feature = "rand_trait")]
-        impl RngCore for $rand {
+        impl rand_core::RngCore for $rand {
             fn next_u32(&mut self) -> u32 {
                 self.next() as u32
             }
@@ -168,7 +180,7 @@ macro_rules! impl_random {
             }
 
             fn fill_bytes(&mut self, dest: &mut [u8]) {
-                fill_bytes_via_next(self, dest)
+                rand_core::impls::fill_bytes_via_next(self, dest)
             }
 
             fn try_fill_bytes(&mut self, dest: &mut [u8]) -> Result<(), rand_core::Error> {
@@ -178,12 +190,12 @@ macro_rules! impl_random {
     };
 }
 
-impl_random!(Xoshiro256PlusPlusRand);
-impl_random!(XorShift64Rand);
-impl_random!(Lehmer64Rand);
-impl_random!(RomuTrioRand);
-impl_random!(RomuDuoJrRand);
-impl_random!(Sfc64Rand);
+impl_rng_core!(Xoshiro256PlusPlusRand);
+impl_rng_core!(XorShift64Rand);
+impl_rng_core!(Lehmer64Rand);
+impl_rng_core!(RomuTrioRand);
+impl_rng_core!(RomuDuoJrRand);
+impl_rng_core!(Sfc64Rand);
 
 /// xoshiro256++ PRNG: <https://prng.di.unimi.it/>
 #[derive(Copy, Clone, Debug, Serialize, Deserialize)]
@@ -480,38 +492,75 @@ mod tests {
         test_single_rand(&mut Sfc64Rand::with_seed(0));
     }
 
-    #[cfg(feature = "std")]
     #[test]
-    fn test_random_seed() {
-        use crate::rands::RandomSeed;
+    fn test_romutrio_golden() {
+        // https://github.com/ziglang/zig/blob/130fb5cb0fb9039e79450c9db58d6590c5bee3b3/lib/std/Random/RomuTrio.zig#L75-L95
+        let golden: [u64; 10] = [
+            16294208416658607535,
+            13964609475759908645,
+            4703697494102998476,
+            3425221541186733346,
+            2285772463536419399,
+            9454187757529463048,
+            13695907680080547496,
+            8328236714879408626,
+            12323357569716880909,
+            12375466223337721820,
+        ];
 
-        let mut rand_fixed = StdRand::with_seed(0);
-        let mut rand = StdRand::new();
-
-        // The seed should be reasonably random so these never fail
-        assert_ne!(rand.next(), rand_fixed.next());
-        test_single_rand(&mut rand);
+        let mut s = RomuTrioRand::with_seed(0);
+        for v in golden {
+            let u = s.next();
+            assert_eq!(v, u);
+        }
     }
 
     #[test]
-    #[cfg(feature = "rand_trait")]
-    fn test_rgn_core_support() {
-        use rand_core::RngCore;
+    fn test_romuduojr_golden() {
+        // https://github.com/eqv/rand_romu/blob/c0379dc3c21ffac8440197e2f8fe95c226c44bfe/src/lib.rs#L65-L79
+        let golden: [u64; 9] = [
+            0x3c91b13ee3913664,
+            0xdc1980b78df3115,
+            0x1c163b704996d2ad,
+            0xa000c594bb28313b,
+            0xfb6c42e69a523526,
+            0x1fcebd6988ab21d8,
+            0x5e0a8abf025f8f02,
+            0x29554b00ffab0263,
+            0xff5b6bb1551cf66,
+        ];
 
-        use crate::rands::StdRand;
-        pub struct Mutator<R: RngCore> {
-            rng: R,
-        }
-
-        let mut mutator = Mutator {
-            rng: StdRand::with_seed(0),
+        let mut s = RomuDuoJrRand {
+            x_state: 0x3c91b13ee3913664u64,
+            y_state: 0x863f0e37c2637d1fu64,
         };
-
-        log::info!("random value: {}", mutator.rng.next_u32());
+        for v in golden {
+            let u = s.next();
+            assert_eq!(v, u);
+        }
     }
 
     #[test]
-    fn test_sfc64_golden_zig() {
+    fn test_xoshiro256pp_golden() {
+        // https://github.com/ziglang/zig/blob/130fb5cb0fb9039e79450c9db58d6590c5bee3b3/lib/std/Random/Xoshiro256.zig#L96-L103
+        let golden: [u64; 6] = [
+            0x53175d61490b23df,
+            0x61da6f3dc380d507,
+            0x5c0fdf91ec9a7bfc,
+            0x02eebf8c3bbe5e1a,
+            0x7eca04ebaf4a5eea,
+            0x0543c37757f08d9a,
+        ];
+
+        let mut s = Xoshiro256PlusPlusRand::with_seed(0);
+        for v in golden {
+            let u = s.next();
+            assert_eq!(v, u);
+        }
+    }
+
+    #[test]
+    fn test_sfc64_golden() {
         // https://github.com/ziglang/zig/blob/130fb5cb0fb9039e79450c9db58d6590c5bee3b3/lib/std/Random/Sfc64.zig#L73-L99
         let golden: [u64; 16] = [
             0x3acfa029e3cc6041,
@@ -548,8 +597,7 @@ pub mod pybind {
     use pyo3::prelude::*;
     use serde::{Deserialize, Serialize};
 
-    use super::Rand;
-    use crate::{current_nanos, rands::StdRand};
+    use super::{random_seed, Rand, StdRand};
 
     #[pyclass(unsendable, name = "StdRand")]
     #[allow(clippy::unsafe_derive_deserialize)]
@@ -563,9 +611,9 @@ pub mod pybind {
     #[pymethods]
     impl PythonStdRand {
         #[staticmethod]
-        fn with_current_nanos() -> Self {
+        fn with_random_seed() -> Self {
             Self {
-                inner: StdRand::with_seed(current_nanos()),
+                inner: StdRand::with_seed(random_seed()),
             }
         }
 

libafl_bolts/src/shmem.rs

@@ -593,7 +593,7 @@ pub mod unix_shmem {
         };
 
         use crate::{
-            rands::{Rand, RandomSeed, StdRand},
+            rands::{Rand, StdRand},
             shmem::{ShMem, ShMemId, ShMemProvider},
             Error,
         };

libafl_libfuzzer/libafl_libfuzzer_runtime/src/lib.rs

@@ -150,7 +150,6 @@ impl CustomMutationStatus {
 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,
@@ -282,7 +281,7 @@ macro_rules! fuzz_with {
             let mut state = state.unwrap_or_else(|| {
                 StdState::new(
                     // RNG
-                    StdRand::with_seed(current_nanos()),
+                    StdRand::new(),
                     // Corpus that will be evolved, we keep it in memory for performance
                     LibfuzzerCorpus::new(corpus_dir.clone(), 4096),
                     // Corpus in which we store solutions (crashes in this example),

libafl_libfuzzer/libafl_libfuzzer_runtime/src/merge.rs

@@ -22,7 +22,7 @@ use libafl::{
     Error, HasScheduler, StdFuzzer,
 };
 use libafl_bolts::{
-    rands::{Rand, RandomSeed, StdRand},
+    rands::{Rand, StdRand},
     shmem::{ShMemProvider, StdShMemProvider},
     tuples::tuple_list,
     AsSlice,

libafl_libfuzzer/libafl_libfuzzer_runtime/src/tmin.rs

@@ -16,7 +16,7 @@ use libafl::{
     Error, Fuzzer, StdFuzzer,
 };
 use libafl_bolts::{
-    rands::{RandomSeed, RomuDuoJrRand, StdRand},
+    rands::{RomuDuoJrRand, StdRand},
     shmem::{ShMemProvider, StdShMemProvider},
     tuples::tuple_list,
     AsSlice, HasLen,

libafl_sugar/src/forkserver.rs

@@ -23,7 +23,6 @@ use libafl::{
 };
 use libafl_bolts::{
     core_affinity::Cores,
-    current_nanos,
     rands::StdRand,
     shmem::{ShMem, ShMemProvider, UnixShMemProvider},
     tuples::{tuple_list, Merge, Referenceable},
@@ -153,7 +152,7 @@ impl<'a> ForkserverBytesCoverageSugar<'a> {
             let mut state = state.unwrap_or_else(|| {
                 StdState::new(
                     // RNG
-                    StdRand::with_seed(current_nanos()),
+                    StdRand::new(),
                     // Corpus that will be evolved, we keep a part in memory for performance
                     CachedOnDiskCorpus::new(out_dir.clone(), CORPUS_CACHE_SIZE).unwrap(),
                     // Corpus in which we store solutions (crashes in this example),

libafl_sugar/src/inmemory.rs

@@ -26,7 +26,6 @@ use libafl::{
 };
 use libafl_bolts::{
     core_affinity::Cores,
-    current_nanos,
     ownedref::OwnedMutSlice,
     rands::StdRand,
     shmem::{ShMemProvider, StdShMemProvider},
@@ -178,7 +177,7 @@ where
             let mut state = state.unwrap_or_else(|| {
                 StdState::new(
                     // RNG
-                    StdRand::with_seed(current_nanos()),
+                    StdRand::new(),
                     // Corpus that will be evolved, we keep a part in memory for performance
                     CachedOnDiskCorpus::new(out_dir.clone(), CORPUS_CACHE_SIZE).unwrap(),
                     // Corpus in which we store solutions (crashes in this example),

libafl_sugar/src/qemu.rs

@@ -29,7 +29,6 @@ use libafl::{
 };
 use libafl_bolts::{
     core_affinity::Cores,
-    current_nanos,
     ownedref::OwnedMutSlice,
     rands::StdRand,
     shmem::{ShMemProvider, StdShMemProvider},
@@ -188,7 +187,7 @@ where
             let mut state = state.unwrap_or_else(|| {
                 StdState::new(
                     // RNG
-                    StdRand::with_seed(current_nanos()),
+                    StdRand::new(),
                     // Corpus that will be evolved, we keep a part in memory for performance
                     CachedOnDiskCorpus::new(out_dir.clone(), CORPUS_CACHE_SIZE).unwrap(),
                     // Corpus in which we store solutions (crashes in this example),