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Merge pull request #1714 from choller/dev

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Add env var to ignore coverage from dynamically loaded code after forkserver
This commit is contained in:
van Hauser
2023-04-25 16:34:23 +02:00
committed by GitHub
parent 2e23418a09 f94a7e8890
commit b96ba509d0
1 changed files with 13 additions and 3 deletions
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16
instrumentation/afl-compiler-rt.o.c
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@ -1563,17 +1563,27 @@ void __sanitizer_cov_trace_pc_guard_init(uint32_t *start, uint32_t *stop) {
"[-] FATAL: forkserver is already up, but an instrumented dlopen() " "[-] FATAL: forkserver is already up, but an instrumented dlopen() "
"library loaded afterwards. You must AFL_PRELOAD such libraries to " "library loaded afterwards. You must AFL_PRELOAD such libraries to "
"be able to fuzz them or LD_PRELOAD to run outside of afl-fuzz.\n" "be able to fuzz them or LD_PRELOAD to run outside of afl-fuzz.\n"
"To ignore this set AFL_IGNORE_PROBLEMS=1 but this will be bad for " "To ignore this set AFL_IGNORE_PROBLEMS=1 but this will lead to "
"coverage.\n"); "ambiguous coverage data.\n"
"In addition, you can set AFL_LLVM_IGNORE_PROBLEMS_COVERAGE=1 to "
"ignore the additional coverage instead (use with caution!).\n");
abort(); abort();
} else { } else {
u8 ignore_dso_after_fs = !!getenv("AFL_LLVM_IGNORE_PROBLEMS_COVERAGE");
if (__afl_debug && ignore_dso_after_fs) {
fprintf(stderr, "Ignoring coverage from dynamically loaded code\n");
}
static u32 offset = 5; static u32 offset = 5;
while (start < stop) { while (start < stop) {
if (likely(inst_ratio == 100) || R(100) < inst_ratio) { if (!ignore_dso_after_fs &&
(likely(inst_ratio == 100) || R(100) < inst_ratio)) {
*(start++) = offset; *(start++) = offset;