blob: 4976b2b46a51b3c586329bc5fdf9e44b27f862ee (
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
58
59
60
61
62
63
64
65
66
67
|
/*
* Copyright (C) 2000-2005 Erik Andersen <andersen@uclibc.org>
*
* Licensed under the LGPL v2.1, see the file COPYING.LIB in this tarball.
*/
#ifndef _DL_OSINFO_H
#define _DL_OSINFO_H 1
#include <features.h>
#ifdef __UCLIBC_HAS_SSP__
#include <stdint.h>
#include <sys/time.h>
#ifdef IS_IN_libc
#include <ssp-internal.h>
#if 0
#ifndef __SSP_QUICK_CANARY__
#define OPEN __libc_open
#define READ __libc_read
#define CLOSE __libc_close
#endif
#define GETTIMEOFDAY gettimeofday
#endif
#else
#ifdef __SSP__
#error "file must not be compiled with stack protection enabled on it. Use -fno-stack-protector"
#endif
#ifndef __SSP_QUICK_CANARY__
#define OPEN _dl_open
#define READ _dl_read
#define CLOSE _dl_close
#endif
#define GETTIMEOFDAY _dl_gettimeofday
#endif
static __always_inline uintptr_t _dl_setup_stack_chk_guard(void)
{
uintptr_t ret;
#ifndef __SSP_QUICK_CANARY__
{
int fd = OPEN("/dev/urandom", O_RDONLY, 0);
if (fd >= 0) {
size_t size = READ(fd, &ret, sizeof(ret));
CLOSE(fd);
if (size == (size_t) sizeof(ret))
return ret;
}
}
#endif /* !__SSP_QUICK_CANARY__ */
/* Start with the "terminator canary". */
ret = 0xFF0A0D00UL;
/* Everything failed? Or we are using a weakened model of the
* terminator canary */
{
struct timeval tv;
if (GETTIMEOFDAY(&tv, NULL) != (-1))
ret ^= tv.tv_usec ^ tv.tv_sec;
}
return ret;
}
#endif /* __UCLIBC_HAS_SSP__ */
#endif /* _DL_OSINFO_H */
|
