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
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
|
/*
Authors:
Simo Sorce <ssorce@redhat.com>
Copyright (C) 2009 Red Hat
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <talloc.h>
#include "util/util.h"
#ifdef HAVE_EXPLICIT_BZERO
#include <string.h>
#else
typedef void *(*_sss_memset_t)(void *, int, size_t);
static volatile _sss_memset_t memset_func = memset;
static void explicit_bzero(void *s, size_t n)
{
memset_func(s, 0, n);
}
#endif
int sss_erase_talloc_mem_securely(void *p)
{
if (p == NULL) {
return 0;
}
size_t size = talloc_get_size(p);
if (size == 0) {
return 0;
}
explicit_bzero(p, size);
return 0;
}
void sss_erase_mem_securely(void *p, size_t size)
{
if ((p == NULL) || (size == 0)) {
return;
}
explicit_bzero(p, size);
}
struct mem_holder {
void *mem;
void_destructor_fn_t *fn;
};
static int mem_holder_destructor(void *ptr)
{
struct mem_holder *h;
h = talloc_get_type(ptr, struct mem_holder);
return h->fn(h->mem);
}
int sss_mem_attach(TALLOC_CTX *mem_ctx, void *ptr, void_destructor_fn_t *fn)
{
struct mem_holder *h;
if (!ptr || !fn) return EINVAL;
h = talloc(mem_ctx, struct mem_holder);
if (!h) return ENOMEM;
h->mem = ptr;
h->fn = fn;
talloc_set_destructor((TALLOC_CTX *)h, mem_holder_destructor);
return EOK;
}
|
