blob: 9015300ae85b034a0e3adfcbed960c34773ba1b1 (
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
|
/* SPDX-License-Identifier: LGPL-2.1-or-later */
#pragma once
#include <stddef.h>
#ifdef SD_BOOT
# include "efi-string.h"
#else
# include <string.h>
#endif
#include "macro-fundamental.h"
#if defined(HAVE_EXPLICIT_BZERO)
static inline void *explicit_bzero_safe(void *p, size_t l) {
if (p && l > 0)
explicit_bzero(p, l);
return p;
}
#else
static inline void *explicit_bzero_safe(void *p, size_t l) {
if (p && l > 0) {
memset(p, 0, l);
__asm__ __volatile__("" : : "r"(p) : "memory");
}
return p;
}
#endif
struct VarEraser {
void *p;
size_t size;
};
static inline void erase_var(struct VarEraser *e) {
explicit_bzero_safe(e->p, e->size);
}
/* Mark var to be erased when leaving scope. */
#define CLEANUP_ERASE(var) \
_cleanup_(erase_var) _unused_ struct VarEraser CONCATENATE(_eraser_, UNIQ) = { .p = &var, .size = sizeof(var) }
|
