1 /* Copyright (C) 2004-2023 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 *
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 *
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 *
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 *
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
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 *
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_XOPEN2K8
83 __fortify_function char *
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 *
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 #ifdef __USE_XOPEN2K8
100 # if __GNUC_PREREQ (4, 7) || __glibc_clang_prereq (2, 6)
101 __fortify_function char *
102 __NTH (stpncpy (char *__dest, const char *__src, size_t __n))
103 {
104 return __builtin___stpncpy_chk (__dest, __src, __n,
105 __glibc_objsize (__dest));
106 }
107 # else
108 extern char *__stpncpy_chk (char *__dest, const char *__src, size_t __n,
109 size_t __destlen) __THROW
110 __fortified_attr_access (__write_only__, 1, 3)
111 __attr_access ((__read_only__, 2));
112 extern char *__REDIRECT_NTH (__stpncpy_alias, (char *__dest, const char *__src,
113 size_t __n), stpncpy);
114
115 __fortify_function char *
116 __NTH (stpncpy (char *__dest, const char *__src, size_t __n))
117 {
118 if (__bos (__dest) != (size_t) -1
119 && (!__builtin_constant_p (__n) || __n > __bos (__dest)))
120 return __stpncpy_chk (__dest, __src, __n, __bos (__dest));
121 return __stpncpy_alias (__dest, __src, __n);
122 }
123 # endif
124 #endif
125
126
127 __fortify_function char *
128 __NTH (strcat (char *__restrict __dest, const char *__restrict __src))
129 {
130 return __builtin___strcat_chk (__dest, __src, __glibc_objsize (__dest));
131 }
132
133
134 __fortify_function char *
135 __NTH (strncat (char *__restrict __dest, const char *__restrict __src,
136 size_t __len))
137 {
138 return __builtin___strncat_chk (__dest, __src, __len,
139 __glibc_objsize (__dest));
140 }
141
142 #ifdef __USE_MISC
143 extern size_t __strlcpy_chk (char *__dest, const char *__src, size_t __n,
144 size_t __destlen) __THROW;
145 extern size_t __REDIRECT_NTH (__strlcpy_alias,
146 (char *__dest, const char *__src, size_t __n),
147 strlcpy);
148
149 __fortify_function size_t
150 __NTH (strlcpy (char *__restrict __dest, const char *__restrict __src,
151 size_t __n))
152 {
153 if (__glibc_objsize (__dest) != (size_t) -1
154 && (!__builtin_constant_p (__n > __glibc_objsize (__dest))
155 || __n > __glibc_objsize (__dest)))
156 return __strlcpy_chk (__dest, __src, __n, __glibc_objsize (__dest));
157 return __strlcpy_alias (__dest, __src, __n);
158 }
159
160 extern size_t __strlcat_chk (char *__dest, const char *__src, size_t __n,
161 size_t __destlen) __THROW;
162 extern size_t __REDIRECT_NTH (__strlcat_alias,
163 (char *__dest, const char *__src, size_t __n),
164 strlcat);
165
166 __fortify_function size_t
167 __NTH (strlcat (char *__restrict __dest, const char *__restrict __src,
168 size_t __n))
169 {
170 if (__glibc_objsize (__dest) != (size_t) -1
171 && (!__builtin_constant_p (__n > __glibc_objsize (__dest))
172 || __n > __glibc_objsize (__dest)))
173 return __strlcat_chk (__dest, __src, __n, __glibc_objsize (__dest));
174 return __strlcat_alias (__dest, __src, __n);
175 }
176 #endif /* __USE_MISC */
177
178 #endif /* bits/string_fortified.h */