[compiler-rt] [compiler-rt][tysan] adding posix strndup interception. (PR #122255)

[via llvm-commits]

llvmbot wrote:


<!--LLVM PR SUMMARY COMMENT-->

@llvm/pr-subscribers-compiler-rt-sanitizer

Author: David CARLIER (devnexen)

<details>
<summary>Changes</summary>



---
Full diff: https://github.com/llvm/llvm-project/pull/122255.diff


1 Files Affected:

- (modified) compiler-rt/lib/tysan/tysan_interceptors.cpp (+15) 


``````````diff
diff --git a/compiler-rt/lib/tysan/tysan_interceptors.cpp b/compiler-rt/lib/tysan/tysan_interceptors.cpp
index 08b1010a48ecf0..2dd4f1d8271f97 100644
--- a/compiler-rt/lib/tysan/tysan_interceptors.cpp
+++ b/compiler-rt/lib/tysan/tysan_interceptors.cpp
@@ -22,6 +22,12 @@
 #define TYSAN_INTERCEPT___STRDUP 0
 #endif
 
+#if SANITIZER_POSIX
+#define TYSAN_INTERCEPT___STRNDUP 1
+#else
+#define TYSAN_INTERCEPT___STRNDUP 0
+#endif
+
 #if SANITIZER_LINUX
 extern "C" int mallopt(int param, int value);
 #endif
@@ -99,6 +105,15 @@ INTERCEPTOR(char *, __strdup, const char *s) {
 }
 #endif // TYSAN_INTERCEPT___STRDUP
 
+#if TYSAN_INTERCEPT___STRNDUP
+INTERCEPTOR(char *, strndup, const char *s, SIZE_T slen) {
+  char *res = REAL(strndup)(s, slen);
+  if (res)
+    tysan_copy_types(res, const_cast<char *>(s), Min(internal_strlen(s), slen));
+  return res;
+}
+#endif
+
 INTERCEPTOR(void *, malloc, uptr size) {
   if (DlsymAlloc::Use())
     return DlsymAlloc::Allocate(size);

``````````

</details>


https://github.com/llvm/llvm-project/pull/122255