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Set AFL_MAP_SIZE in forkserver (#2531)

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* set AFL_MAP_SIZE

* aaaaaaa
This commit is contained in:
Dongjia "toka" Zhang 2024-09-18 17:03:48 +02:00 committed by GitHub
parent cf87895aaa
commit 4e302a2115
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GPG Key ID: B5690EEEBB952194
1 changed files with 12 additions and 1 deletions
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13
libafl/src/executors/forkserver.rs
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@ -309,6 +309,7 @@ impl Forkserver {
memlimit: u64,
is_persistent: bool,
is_deferred_frksrv: bool,
coverage_map_size: Option<usize>,
debug_output: bool,
) -> Result<Self, Error> {
Self::with_kill_signal(
@ -320,6 +321,7 @@ impl Forkserver {
memlimit,
is_persistent,
is_deferred_frksrv,
coverage_map_size,
debug_output,
KILL_SIGNAL_DEFAULT,
)
@ -338,15 +340,20 @@ impl Forkserver {
memlimit: u64,
is_persistent: bool,
is_deferred_frksrv: bool,
coverage_map_size: Option<usize>,
debug_output: bool,
kill_signal: Signal,
) -> Result<Self, Error> {
let Some(coverage_map_size) = coverage_map_size else {
return Err(Error::unknown("Coverage map size unknown. Use coverage_map_size() to tell the forkserver about the map size."));
};
if env::var("AFL_MAP_SIZE").is_err() {
log::warn!("AFL_MAP_SIZE not set. If it is unset, the forkserver may fail to start up");
}
if env::var("__AFL_SHM_ID").is_err() {
log::warn!("__AFL_SHM_ID not set. It is necessary to set this env, otherwise the forkserver cannot communicate with the fuzzer");
return Err(Error::unknown("__AFL_SHM_ID not set. It is necessary to set this env, otherwise the forkserver cannot communicate with the fuzzer".to_string()));
}
let mut st_pipe = Pipe::new().unwrap();
@ -366,6 +373,8 @@ impl Forkserver {
.stdout(stdout)
.stderr(stderr);
command.env("AFL_MAP_SIZE", format!("{coverage_map_size}"));
// Persistent, deferred forkserver
if is_persistent {
command.env("__AFL_PERSISTENT", "1");
@ -813,6 +822,7 @@ where
0,
self.is_persistent,
self.is_deferred_frksrv,
self.map_size,
self.debug_child,
self.kill_signal.unwrap_or(KILL_SIGNAL_DEFAULT),
)?,
@ -1515,6 +1525,7 @@ mod tests {
let executor = ForkserverExecutor::builder()
.program(bin)
.args(args)
.coverage_map_size(MAP_SIZE)
.debug_child(false)
.shmem_provider(&mut shmem_provider)
.build::<_, ()>(tuple_list!(edges_observer));