Adam Langley | d059297 | 2015-03-30 14:49:51 -0700 | [diff] [blame] | 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 $ */ |
| 3 | /* |
| 4 | * Public domain. |
| 5 | * Written by Ted Unangst |
| 6 | */ |
| 7 | |
| 8 | #include "includes.h" |
| 9 | #include <string.h> |
| 10 | |
| 11 | /* |
| 12 | * explicit_bzero - don't let the compiler optimize away bzero |
| 13 | */ |
| 14 | |
| 15 | #ifndef HAVE_EXPLICIT_BZERO |
| 16 | |
| 17 | #ifdef HAVE_MEMSET_S |
| 18 | |
| 19 | void |
| 20 | explicit_bzero(void *p, size_t n) |
| 21 | { |
| 22 | (void)memset_s(p, n, 0, n); |
| 23 | } |
| 24 | |
| 25 | #else /* HAVE_MEMSET_S */ |
| 26 | |
| 27 | /* |
| 28 | * Indirect bzero through a volatile pointer to hopefully avoid |
| 29 | * dead-store optimisation eliminating the call. |
| 30 | */ |
| 31 | static void* (* volatile ssh_memset)(void *, int, size_t) = memset; |
| 32 | |
| 33 | void |
| 34 | explicit_bzero(void *p, size_t n) |
| 35 | { |
| 36 | ssh_memset(p, 0, n); |
| 37 | } |
| 38 | |
| 39 | #endif /* HAVE_MEMSET_S */ |
| 40 | |
| 41 | #endif /* HAVE_EXPLICIT_BZERO */ |