[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

git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@257423 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 4 insertions, 2 deletions

diff --git a/include/sanitizer/common_interface_defs.h b/include/sanitizer/common_interface_defs.h
index b736ed9e5..b2a4bb7b8 100644
--- a/include/sanitizer/common_interface_defs.h
+++ b/include/sanitizer/common_interface_defs.h
@@ -125,9 +125,11 @@ extern "C" {
   // to know what is being passed to libc functions, e.g. memcmp.
   // FIXME: implement more hooks.
   void __sanitizer_weak_hook_memcmp(void *called_pc, const void *s1,
-                                    const void *s2, size_t n);
+                                    const void *s2, size_t n, int result);
   void __sanitizer_weak_hook_strncmp(void *called_pc, const char *s1,
-                                    const char *s2, size_t n);
+                                    const char *s2, size_t n, int result);
+  void __sanitizer_weak_hook_strcmp(void *called_pc, const char *s1,
+                                    const char *s2, int result);
 #ifdef __cplusplus
 }  // extern "C"
 #endif