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[libFuzzer] extend the weak memcmp/strcmp/strncmp interceptors to receive the result of the computations. With that, don't do any mutations if memcmp/etc returned 0

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@257423 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Kostya Serebryany 2016-01-12 00:43:42 +00:00
parent 132f8670a3
commit d89bfb65a8
1 changed files with 6 additions and 3 deletions
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9
lib/Fuzzer/FuzzerTraceState.cpp
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@ -539,16 +539,18 @@ void dfsan_weak_hook_strcmp(void *caller_pc, const char *s1, const char *s2,
}
void __sanitizer_weak_hook_memcmp(void *caller_pc, const void *s1,
const void *s2, size_t n) {
const void *s2, size_t n, int result) {
if (!TS) return;
if (result == 0) return; // No reason to mutate.
if (n <= 1) return; // Not interesting.
TS->TraceMemcmpCallback(n, reinterpret_cast<const uint8_t *>(s1),
reinterpret_cast<const uint8_t *>(s2));
}
void __sanitizer_weak_hook_strncmp(void *caller_pc, const char *s1,
const char *s2, size_t n) {
const char *s2, size_t n, int result) {
if (!TS) return;
if (result == 0) return; // No reason to mutate.
size_t Len1 = fuzzer::InternalStrnlen(s1, n);
size_t Len2 = fuzzer::InternalStrnlen(s2, n);
n = std::min(n, Len1);
@ -559,8 +561,9 @@ void __sanitizer_weak_hook_strncmp(void *caller_pc, const char *s1,
}
void __sanitizer_weak_hook_strcmp(void *caller_pc, const char *s1,
const char *s2) {
const char *s2, int result) {
if (!TS) return;
if (result == 0) return; // No reason to mutate.
size_t Len1 = strlen(s1);
size_t Len2 = strlen(s2);
size_t N = std::min(Len1, Len2);