1 /* OPENBSD ORIGINAL: lib/libc/string/explicit_bzero.c */
2 /* $OpenBSD: explicit_bzero.c,v 1.1 2014/01/22 21:06:45 tedu Exp $ */
5 * Written by Ted Unangst
13 * explicit_bzero - don't let the compiler optimize away bzero
16 #ifndef HAVE_EXPLICIT_BZERO
21 explicit_bzero(void *p, size_t n)
23 (void)memset_s(p, n, 0, n);
26 #else /* HAVE_MEMSET_S */
29 * Indirect bzero through a volatile pointer to hopefully avoid
30 * dead-store optimisation eliminating the call.
32 static void (* volatile ssh_bzero)(void *, size_t) = bzero;
35 explicit_bzero(void *p, size_t n)
38 * clang -fsanitize=memory needs to intercept memset-like functions
39 * to correctly detect memory initialisation. Make sure one is called
40 * directly since our indirection trick above sucessfully confuses it.
42 #if defined(__has_feature)
43 # if __has_feature(memory_sanitizer)
51 #endif /* HAVE_MEMSET_S */
53 #endif /* HAVE_EXPLICIT_BZERO */