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
|
/*
* Copyright (C) 2022 be.storaged GmbH
*
* This file is part of libfaketime
*
* libfaketime is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License v2 as published by the
* Free Software Foundation.
*
* libfaketime 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 v2 along
* with the libfaketime; if not, write to the Free Software Foundation,
* Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include <pthread.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <unistd.h>
static void print_msg(const char *msg) {
write(0, msg, strlen(msg));
}
static void* actual_malloc(size_t size) {
/* We would like to use "the real malloc", but cannot. Thus, this
* implements a trivial, allocate-only bump allocator to make things
* work.
*/
static char memory_arena[16 << 20];
static size_t allocated_index = 0;
void *result = &memory_arena[allocated_index];
allocated_index += size;
/* align to a multiple of 8 bytes */
allocated_index = (allocated_index + 7) / 8 * 8;
if (allocated_index >= sizeof(memory_arena)) {
print_msg("libmallocintercept is out of memory!");
abort();
}
return result;
}
static void poke_faketime(void) {
#ifdef FAIL_PRE_INIT_CALLS
/* To complicate things for libfaketime, this calls clock_gettime()
* while holding a lock. This should simulate problems that occurred
* with address sanitizer.
*/
static pthread_mutex_t time_mutex = PTHREAD_MUTEX_INITIALIZER;
struct timespec timespec;
pthread_mutex_lock(&time_mutex);
clock_gettime(CLOCK_REALTIME, ×pec);
pthread_mutex_unlock(&time_mutex);
#else
print_msg("FAIL_PRE_INIT_CALLS not defined, skipping poke_faketime() ");
#endif
}
void *malloc(size_t size) {
print_msg("Called malloc() from libmallocintercept...");
poke_faketime();
print_msg("successfully\n");
return actual_malloc(size);
}
void free(void *ptr) {
long int ptr2 = (long int) ptr; ptr2 -= (long int) ptr;
print_msg("Called free() on from libmallocintercept...");
poke_faketime();
print_msg("successfully\n");
/* We cannot actually free memory */
}
|
