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
|
/* Operating system specific code for generic dynamic loader functions.
Copyright (C) 2006 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, write to the Free
Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
02111-1307 USA. */
#include <kernel-features.h>
#include <dl-sysdep.h>
#include <endian.h>
#include <fcntl.h>
#include <stdint.h>
#include <not-cancel.h>
#ifndef MIN
# define MIN(a,b) (((a)<(b))?(a):(b))
#endif
#define DL_SYSDEP_OSCHECK(FATAL) \
do { \
/* Test whether the kernel is new enough. This test is only performed \
if the library is not compiled to run on all kernels. */ \
\
int version = _dl_discover_osversion (); \
if (__builtin_expect (version >= 0, 1)) \
{ \
if (__builtin_expect (GLRO(dl_osversion) == 0, 1) \
|| GLRO(dl_osversion) > version) \
GLRO(dl_osversion) = version; \
\
/* Now we can test with the required version. */ \
if (__KFREEBSD_KERNEL_VERSION > 0 && \
version < __KFREEBSD_KERNEL_VERSION) \
/* Not sufficent. */ \
FATAL ("FATAL: kernel too old\n"); \
} \
else if (__KFREEBSD_KERNEL_VERSION > 0) \
FATAL ("FATAL: cannot determine kernel version\n"); \
} while (0)
static inline uintptr_t __attribute__ ((always_inline))
_dl_setup_stack_chk_guard (void *dl_random)
{
union
{
uintptr_t num;
unsigned char bytes[sizeof (uintptr_t)];
} ret;
{
const size_t filllen = sizeof (ret.bytes) - 1;
ret.num = 0;
# ifdef ENABLE_STACKGUARD_RANDOMIZE
int fd = open_not_cancel_2 ("/dev/urandom", O_RDONLY);
if (fd >= 0)
{
ssize_t reslen = read_not_cancel (fd, ret.bytes + 1, filllen);
close_not_cancel_no_status (fd);
if (reslen == (ssize_t) filllen)
return ret.num;
}
# endif
ret.bytes[filllen] = 255;
ret.bytes[filllen - 1] = '\n';
}
return ret.num;
}
static inline uintptr_t __attribute__ ((always_inline))
_dl_setup_pointer_guard (void *dl_random, uintptr_t stack_chk_guard)
{
uintptr_t ret;
ret = stack_chk_guard;
# ifndef HP_TIMING_NONAVAIL
hp_timing_t now;
HP_TIMING_NOW (now);
ret ^= now;
# endif
return ret;
}
|
