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Intercept strlcpy and strlcat for msan on Clang 17 (#12674)

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Ilija Tovilo 2023-11-15 17:43:44 +01:00
parent d966c296d0
commit 99504aa148
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1 changed files with 28 additions and 0 deletions
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28
Zend/zend_string.c
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@ -23,6 +23,10 @@
# include "valgrind/callgrind.h"
#endif
#if __has_feature(memory_sanitizer)
# include <sanitizer/msan_interface.h>
#endif
ZEND_API zend_new_interned_string_func_t zend_new_interned_string;
ZEND_API zend_string_init_interned_func_t zend_string_init_interned;
ZEND_API zend_string_init_existing_interned_func_t zend_string_init_existing_interned;
@ -490,3 +494,27 @@ ZEND_API zend_string *zend_string_concat3(
return res;
}
/* strlcpy and strlcat are not intercepted by msan, so we need to do it ourselves. */
#if __has_feature(memory_sanitizer)
static size_t (*libc_strlcpy)(char *__restrict, const char *__restrict, size_t);
size_t strlcpy(char *__restrict dest, const char *__restrict src, size_t n)
{
if (!libc_strlcpy) {
libc_strlcpy = dlsym(RTLD_NEXT, "strlcpy");
}
size_t result = libc_strlcpy(dest, src, n);
__msan_unpoison_string(dest);
return result;
}
static size_t (*libc_strlcat)(char *__restrict, const char *__restrict, size_t);
size_t strlcat (char *__restrict dest, const char *restrict src, size_t n)
{
if (!libc_strlcat) {
libc_strlcat = dlsym(RTLD_NEXT, "strlcat");
}
size_t result = libc_strlcat(dest, src, n);
__msan_unpoison_string(dest);
return result;
}
#endif