blob: 53a003472721d4038a572a431d54f8948dff448f (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
|
/* OPENBSD ORIGINAL: lib/libc/string/explicit_bzero.c */
/* $OpenBSD: explicit_bzero.c,v 1.1 2014/01/22 21:06:45 tedu Exp $ */
/*
* Public domain.
* Written by Ted Unangst
*/
#include "includes.h"
#include <string.h>
/*
* explicit_bzero - don't let the compiler optimize away bzero
*/
#ifndef HAVE_EXPLICIT_BZERO
#ifdef HAVE_MEMSET_S
void
explicit_bzero(void *p, size_t n)
{
if (n == 0)
return;
(void)memset_s(p, n, 0, n);
}
#else /* HAVE_MEMSET_S */
/*
* Indirect bzero through a volatile pointer to hopefully avoid
* dead-store optimisation eliminating the call.
*/
static void (* volatile ssh_bzero)(void *, size_t) = bzero;
void
explicit_bzero(void *p, size_t n)
{
if (n == 0)
return;
/*
* clang -fsanitize=memory needs to intercept memset-like functions
* to correctly detect memory initialisation. Make sure one is called
* directly since our indirection trick above sucessfully confuses it.
*/
#if defined(__has_feature)
# if __has_feature(memory_sanitizer)
memset(p, 0, n);
# endif
#endif
ssh_bzero(p, n);
}
#endif /* HAVE_MEMSET_S */
#endif /* HAVE_EXPLICIT_BZERO */
|
