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Fix second Forkserver Broken Pipe (#1013)

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* Truncate at MAX_FILE

* AFL_MAP_SIZE

* todo
This commit is contained in:
Andrea Fioraldi 2023-01-24 20:50:56 +01:00 committed by GitHub
parent 00ec7e143c
commit 92c0c5eeab
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2 changed files with 8 additions and 1 deletions
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2
fuzzers/fuzzbench_forkserver/src/main.rs
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@ -241,6 +241,8 @@ fn fuzz(
// let the forkserver know the shmid
shmem.write_to_env("__AFL_SHM_ID").unwrap();
let shmem_buf = shmem.as_mut_slice();
// To let know the AFL++ binary that we have a big map
std::env::set_var("AFL_MAP_SIZE", format!("{}", MAP_SIZE));
// Create an observation channel using the hitcounts map of AFL++
let edges_observer =

7
libafl/src/executors/forkserver.rs
View File

@ -765,6 +765,7 @@ impl<'a, SP> ForkserverExecutorBuilder<'a, SP> {
map_size = ((map_size + 63) >> 6) << 6;
}
// TODO set AFL_MAP_SIZE
assert!(self.map_size.is_none() || map_size as usize <= self.map_size.unwrap());
println!("Target MAP SIZE = {:#x}", self.real_map_size);
@ -1030,7 +1031,11 @@ where
if self.uses_shmem_testcase {
let map = unsafe { self.map.as_mut().unwrap_unchecked() };
let target_bytes = input.target_bytes();
let size = target_bytes.as_slice().len();
let mut size = target_bytes.as_slice().len();
if size > MAX_FILE {
// Truncate like AFL++ does
size = MAX_FILE;
}
let size_in_bytes = size.to_ne_bytes();
// The first four bytes tells the size of the shmem.
map.as_mut_slice()[..SHMEM_FUZZ_HDR_SIZE]