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
98
|
/*
* 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 2
* 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, write to the Free Software Foundation,
* Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
#pragma once
/* Clang defines this. */
#ifndef __has_feature
# define __has_feature(x) 0
#endif
#if (defined(__SANITIZE_ADDRESS__) || __has_feature(address_sanitizer))
# include "sanitizer/asan_interface.h"
#else
/* Ensure return value is used. Just using UNUSED_VARS results in a warning. */
# define ASAN_POISON_MEMORY_REGION(addr, size) (void)(0 && ((size) != 0 && (addr) != NULL))
# define ASAN_UNPOISON_MEMORY_REGION(addr, size) (void)(0 && ((size) != 0 && (addr) != NULL))
#endif
/**
* Mark a region of memory as "freed". When using address sanitizer, accessing the given memory
* region will cause an use-after-poison error. This can be used to find errors when dealing with
* uninitialized memory in custom containers.
*/
#define BLI_asan_poison(addr, size) ASAN_POISON_MEMORY_REGION(addr, size)
/**
* Mark a region of memory as usable again.
*/
#define BLI_asan_unpoison(addr, size) ASAN_UNPOISON_MEMORY_REGION(addr, size)
#if (defined(__SANITIZE_ADDRESS__) || __has_feature(address_sanitizer))
# include "MEM_guardedalloc.h"
static void *BLI_asan_safe_malloc(size_t size, const char *tag)
{
// align size at 16 bytes
size += 15 - (size & 15);
// add safe padding
size += 32;
void *ret = MEM_mallocN(size, tag);
int *iptr = (int *)ret;
*iptr = (int)size;
char *ptr = (char *)ret;
ptr[4] = 't';
ptr[5] = 'a';
ptr[6] = 'g';
ptr[7] = '1';
BLI_asan_poison(ptr, 16);
BLI_asan_poison(ptr + size - 16, 16);
ret = (void *)(ptr + 16);
return ret;
}
static void BLI_asan_safe_free(void *mem)
{
if (!mem) {
return;
}
mem = (void *)(((char *)mem) - 16);
BLI_asan_unpoison(mem, 16);
int *iptr = (int *)mem;
volatile char *ptr = (char *)mem;
if (ptr[4] != 't' || ptr[5] != 'a' || ptr[6] != 'g' || ptr[7] != '1') {
BLI_asan_poison(mem, 16);
*ptr = 1; // deliberately trigger asan fault
}
BLI_asan_unpoison(ptr + iptr[0] - 16, 16);
MEM_freeN((void *)ptr);
}
#else
# define BLI_asan_safe_malloc(size, tag) MEM_mallocN(size, tag)
# define BLI_asan_safe_free(mem) MEM_SAFE_FREE(mem)
#endif
|
