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drcov_rt: make coverage file names unique (#1581)

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* fix(drcov_rt): coverage files are overwritten if have the same names

Make it unique.

* fix(drcov_rt): use coverage and input as a filename, skip empty covs
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Abc Xyz 2023-11-04 19:54:35 +03:00 committed by GitHub
parent 8a18ee4ece
commit 65ddfa6acf
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1 changed files with 19 additions and 6 deletions
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25
libafl_frida/src/drcov_rt.rs
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@ -22,13 +22,13 @@ use crate::helper::FridaRuntime;
pub struct DrCovRuntime {
/// The basic blocks of this execution
pub drcov_basic_blocks: Vec<DrCovBasicBlock>,
/// The memory ragnes of this target
/// The memory ranges of this target
ranges: RangeMap<usize, (u16, String)>,
coverage_directory: PathBuf,
}
impl FridaRuntime for DrCovRuntime {
/// initializes this runtime wiith the given `ranges`
/// initializes this runtime with the given `ranges`
fn init(
&mut self,
_gum: &frida_gum::Gum,
@ -46,14 +46,27 @@ impl FridaRuntime for DrCovRuntime {
}
/// Called after execution, writes the trace to a unique `DrCov` file for this trace
/// into `./coverage/<trace_hash>.drcov`
/// into `./coverage/<input_hash>_<coverage_hash>.drcov`. Empty coverages will be skipped.
fn post_exec<I: Input + HasTargetBytes>(&mut self, input: &I) -> Result<(), Error> {
let mut hasher = RandomState::with_seeds(0, 0, 0, 0).build_hasher();
hasher.write(input.target_bytes().as_slice());
// We don't need empty coverage files
if self.drcov_basic_blocks.is_empty() {
return Ok(());
}
let mut input_hasher = RandomState::with_seeds(0, 0, 0, 0).build_hasher();
input_hasher.write(input.target_bytes().as_slice());
let input_hash = input_hasher.finish();
let mut coverage_hasher = RandomState::with_seeds(0, 0, 0, 0).build_hasher();
for bb in &self.drcov_basic_blocks {
coverage_hasher.write_usize(bb.start);
coverage_hasher.write_usize(bb.end);
}
let coverage_hash = coverage_hasher.finish();
let filename = self
.coverage_directory
.join(format!("{:016x}.drcov", hasher.finish(),));
.join(format!("{input_hash:016x}_{coverage_hash:016x}.drcov"));
DrCovWriter::new(&self.ranges).write(filename, &self.drcov_basic_blocks)?;
self.drcov_basic_blocks.clear();