1 /* Copyright (C) 2004-2021 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
3
4 The GNU C Library is free software; you can redistribute it and/or
5 modify it under the terms of the GNU Lesser General Public
6 License as published by the Free Software Foundation; either
7 version 2.1 of the License, or (at your option) any later version.
8
9 The GNU C Library is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 Lesser General Public License for more details.
13
14 You should have received a copy of the GNU Lesser General Public
15 License along with the GNU C Library; if not, see
16 <https://www.gnu.org/licenses/>. */
17
18 #ifndef _BITS_STRING_FORTIFIED_H
19 #define _BITS_STRING_FORTIFIED_H 1
20
21 #ifndef _STRING_H
22 # error "Never use <bits/string_fortified.h> directly; include <string.h> instead."
23 #endif
24
25 __fortify_function void *
__NTH(memcpy (void * __restrict __dest,const void * __restrict __src,size_t __len))26 __NTH (memcpy (void *__restrict __dest, const void *__restrict __src,
27 size_t __len))
28 {
29 return __builtin___memcpy_chk (__dest, __src, __len,
30 __glibc_objsize0 (__dest));
31 }
32
33 __fortify_function void *
__NTH(memmove (void * __dest,const void * __src,size_t __len))34 __NTH (memmove (void *__dest, const void *__src, size_t __len))
35 {
36 return __builtin___memmove_chk (__dest, __src, __len,
37 __glibc_objsize0 (__dest));
38 }
39
40 #ifdef __USE_GNU
41 __fortify_function void *
__NTH(mempcpy (void * __restrict __dest,const void * __restrict __src,size_t __len))42 __NTH (mempcpy (void *__restrict __dest, const void *__restrict __src,
43 size_t __len))
44 {
45 return __builtin___mempcpy_chk (__dest, __src, __len,
46 __glibc_objsize0 (__dest));
47 }
48 #endif
49
50
51 /* The first two tests here help to catch a somewhat common problem
52 where the second and third parameter are transposed. This is
53 especially problematic if the intended fill value is zero. In this
54 case no work is done at all. We detect these problems by referring
55 non-existing functions. */
56 __fortify_function void *
__NTH(memset (void * __dest,int __ch,size_t __len))57 __NTH (memset (void *__dest, int __ch, size_t __len))
58 {
59 return __builtin___memset_chk (__dest, __ch, __len,
60 __glibc_objsize0 (__dest));
61 }
62
63 #ifdef __USE_MISC
64 # include <bits/strings_fortified.h>
65
66 void __explicit_bzero_chk (void *__dest, size_t __len, size_t __destlen)
67 __THROW __nonnull ((1)) __fortified_attr_access (__write_only__, 1, 2);
68
69 __fortify_function void
__NTH(explicit_bzero (void * __dest,size_t __len))70 __NTH (explicit_bzero (void *__dest, size_t __len))
71 {
72 __explicit_bzero_chk (__dest, __len, __glibc_objsize0 (__dest));
73 }
74 #endif
75
76 __fortify_function char *
__NTH(strcpy (char * __restrict __dest,const char * __restrict __src))77 __NTH (strcpy (char *__restrict __dest, const char *__restrict __src))
78 {
79 return __builtin___strcpy_chk (__dest, __src, __glibc_objsize (__dest));
80 }
81
82 #ifdef __USE_GNU
83 __fortify_function char *
__NTH(stpcpy (char * __restrict __dest,const char * __restrict __src))84 __NTH (stpcpy (char *__restrict __dest, const char *__restrict __src))
85 {
86 return __builtin___stpcpy_chk (__dest, __src, __glibc_objsize (__dest));
87 }
88 #endif
89
90
91 __fortify_function char *
__NTH(strncpy (char * __restrict __dest,const char * __restrict __src,size_t __len))92 __NTH (strncpy (char *__restrict __dest, const char *__restrict __src,
93 size_t __len))
94 {
95 return __builtin___strncpy_chk (__dest, __src, __len,
96 __glibc_objsize (__dest));
97 }
98
99 #if __GNUC_PREREQ (4, 7) || __glibc_clang_prereq (2, 6)
100 __fortify_function char *
__NTH(stpncpy (char * __dest,const char * __src,size_t __n))101 __NTH (stpncpy (char *__dest, const char *__src, size_t __n))
102 {
103 return __builtin___stpncpy_chk (__dest, __src, __n,
104 __glibc_objsize (__dest));
105 }
106 #else
107 extern char *__stpncpy_chk (char *__dest, const char *__src, size_t __n,
108 size_t __destlen) __THROW
109 __fortified_attr_access ((__write_only__, 1, 3))
110 __attr_access ((__read_only__, 2));
111 extern char *__REDIRECT_NTH (__stpncpy_alias, (char *__dest, const char *__src,
112 size_t __n), stpncpy);
113
114 __fortify_function char *
__NTH(stpncpy (char * __dest,const char * __src,size_t __n))115 __NTH (stpncpy (char *__dest, const char *__src, size_t __n))
116 {
117 if (__bos (__dest) != (size_t) -1
118 && (!__builtin_constant_p (__n) || __n > __bos (__dest)))
119 return __stpncpy_chk (__dest, __src, __n, __bos (__dest));
120 return __stpncpy_alias (__dest, __src, __n);
121 }
122 #endif
123
124
125 __fortify_function char *
__NTH(strcat (char * __restrict __dest,const char * __restrict __src))126 __NTH (strcat (char *__restrict __dest, const char *__restrict __src))
127 {
128 return __builtin___strcat_chk (__dest, __src, __glibc_objsize (__dest));
129 }
130
131
132 __fortify_function char *
__NTH(strncat (char * __restrict __dest,const char * __restrict __src,size_t __len))133 __NTH (strncat (char *__restrict __dest, const char *__restrict __src,
134 size_t __len))
135 {
136 return __builtin___strncat_chk (__dest, __src, __len,
137 __glibc_objsize (__dest));
138 }
139
140 #endif /* bits/string_fortified.h */
141