« back to all changes in this revision
Viewing changes to reference/glibc-c/bp-checks.h
- browse files at revision 70
- compare with another revision
- compare with revision 89
- download diff
- download tarball
- view history from revision 70
- Committer: Michael Hope
- Date: 2012-06-12 03:19:48 UTC
- Revision ID: michael.hope@linaro.org-20120612031948-4ii8jicywtzjprak
Added the C only routines from GLIBC 2.16+20120607~git24a6dbe
- files added:
- reference/glibc-c
added
removed
reference/glibc-c/bp-checks.h
1
/* Bounded-pointer checking macros for C.
2
Copyright (C) 2000 Free Software Foundation, Inc.
3
This file is part of the GNU C Library.
4
Contributed by Greg McGary <greg@mcgary.org>
5
6
The GNU C Library is free software; you can redistribute it and/or
7
modify it under the terms of the GNU Lesser General Public
8
License as published by the Free Software Foundation; either
9
version 2.1 of the License, or (at your option) any later version.
10
11
The GNU C Library is distributed in the hope that it will be useful,
12
but WITHOUT ANY WARRANTY; without even the implied warranty of
13
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14
Lesser General Public License for more details.
15
16
You should have received a copy of the GNU Lesser General Public
17
License along with the GNU C Library; if not, see
18
<http://www.gnu.org/licenses/>. */
19
20
#ifndef _bp_checks_h_
21
#define _bp_checks_h_ 1
22
23
#if __BOUNDED_POINTERS__
24
25
# define BOUNDS_VIOLATED (__builtin_trap (), 0)
26
27
/* Verify that pointer's value >= low. Return pointer value. */
28
# define CHECK_BOUNDS_LOW(ARG) \
29
(((__ptrvalue (ARG) < __ptrlow (ARG)) && BOUNDS_VIOLATED), \
30
__ptrvalue (ARG))
31
32
/* Verify that pointer's value < high. Return pointer value. */
33
# define CHECK_BOUNDS_HIGH(ARG) \
34
(((__ptrvalue (ARG) > __ptrhigh (ARG)) && BOUNDS_VIOLATED), \
35
__ptrvalue (ARG))
36
37
# define _CHECK_N(ARG, N, COND) \
38
(((COND) \
39
&& (__ptrvalue (ARG) < __ptrlow (ARG) \
40
|| __ptrvalue (ARG) + (N) > __ptrhigh (ARG)) \
41
&& BOUNDS_VIOLATED), \
42
__ptrvalue (ARG))
43
44
extern void *__unbounded __ubp_memchr (const void *__unbounded, int, unsigned);
45
46
# define _CHECK_STRING(ARG, COND) \
47
(((COND) \
48
&& (__ptrvalue (ARG) < __ptrlow (ARG) \
49
|| !__ubp_memchr (__ptrvalue (ARG), '\0', \
50
(__ptrhigh (ARG) - __ptrvalue (ARG)))) \
51
&& BOUNDS_VIOLATED), \
52
__ptrvalue (ARG))
53
54
/* Check bounds of a pointer seated to an array of N objects. */
55
# define CHECK_N(ARG, N) _CHECK_N ((ARG), (N), 1)
56
/* Same as CHECK_N, but tolerate ARG == NULL. */
57
# define CHECK_N_NULL_OK(ARG, N) _CHECK_N ((ARG), (N), __ptrvalue (ARG))
58
59
/* Check bounds of a pointer seated to a single object. */
60
# define CHECK_1(ARG) CHECK_N ((ARG), 1)
61
/* Same as CHECK_1, but tolerate ARG == NULL. */
62
# define CHECK_1_NULL_OK(ARG) CHECK_N_NULL_OK ((ARG), 1)
63
64
/* Check for NUL-terminator within string's bounds. */
65
# define CHECK_STRING(ARG) _CHECK_STRING ((ARG), 1)
66
/* Same as CHECK_STRING, but tolerate ARG == NULL. */
67
# define CHECK_STRING_NULL_OK(ARG) _CHECK_STRING ((ARG), __ptrvalue (ARG))
68
69
/* Check bounds of signal syscall args with type sigset_t. */
70
# define CHECK_SIGSET(SET) CHECK_N ((SET), _NSIG / (8 * sizeof *(SET)))
71
/* Same as CHECK_SIGSET, but tolerate SET == NULL. */
72
# define CHECK_SIGSET_NULL_OK(SET) CHECK_N_NULL_OK ((SET), _NSIG / (8 * sizeof *(SET)))
73
74
# if defined (_IOC_SIZESHIFT) && defined (_IOC_SIZEBITS)
75
/* Extract the size of the ioctl data and check its bounds. */
76
# define CHECK_IOCTL(ARG, CMD) \
77
CHECK_N ((const char *) (ARG), \
78
(((CMD) >> _IOC_SIZESHIFT) & ((1 << _IOC_SIZEBITS) - 1)))
79
# else
80
/* We don't know the size of the ioctl data, so the best we can do
81
is check that the first byte is within bounds. */
82
# define CHECK_IOCTL(ARG, CMD) CHECK_1 ((const char *) ARG)
83
# endif
84
85
/* Check bounds of `struct flock *' for the locking fcntl commands. */
86
# define CHECK_FCNTL(ARG, CMD) \
87
(((CMD) == F_GETLK || (CMD) == F_SETLK || (CMD) == F_SETLKW) \
88
? CHECK_1 ((struct flock *) ARG) : (unsigned long) (ARG))
89
90
/* Check bounds of an array of mincore residency-status flags that
91
cover a region of NBYTES. Such a vector occupies one byte per page
92
of memory. */
93
# define CHECK_N_PAGES(ARG, NBYTES) \
94
({ int _page_size_ = sysconf (_SC_PAGE_SIZE); \
95
CHECK_N ((const char *) (ARG), \
96
((NBYTES) + _page_size_ - 1) / _page_size_); })
97
98
/* Return a bounded pointer with value PTR that satisfies CHECK_N (PTR, N). */
99
# define BOUNDED_N(PTR, N) \
100
({ __typeof (PTR) __bounded _p_; \
101
__ptrvalue _p_ = __ptrlow _p_ = __ptrvalue (PTR); \
102
__ptrhigh _p_ = __ptrvalue _p_ + (N); \
103
_p_; })
104
105
#else /* !__BOUNDED_POINTERS__ */
106
107
/* Do nothing if not compiling with -fbounded-pointers. */
108
109
# define BOUNDS_VIOLATED
110
# define CHECK_BOUNDS_LOW(ARG) (ARG)
111
# define CHECK_BOUNDS_HIGH(ARG) (ARG)
112
# define CHECK_1(ARG) (ARG)
113
# define CHECK_1_NULL_OK(ARG) (ARG)
114
# define CHECK_N(ARG, N) (ARG)
115
# define CHECK_N_NULL_OK(ARG, N) (ARG)
116
# define CHECK_STRING(ARG) (ARG)
117
# define CHECK_SIGSET(SET) (SET)
118
# define CHECK_SIGSET_NULL_OK(SET) (SET)
119
# define CHECK_IOCTL(ARG, CMD) (ARG)
120
# define CHECK_FCNTL(ARG, CMD) (ARG)
121
# define CHECK_N_PAGES(ARG, NBYTES) (ARG)
122
# define BOUNDED_N(PTR, N) (PTR)
123
124
#endif /* !__BOUNDED_POINTERS__ */
125
126
#define BOUNDED_1(PTR) BOUNDED_N (PTR, 1)
127
128
#endif /* _bp_checks_h_ */
Loggerhead is a web-based interface for Breezy
Version: 2.0.1