Line data Source code
1 : /* Checking macros for unistd functions.
2 : Copyright (C) 2005-2020 Free Software Foundation, Inc.
3 : This file is part of the GNU C Library.
4 :
5 : The GNU C Library is free software; you can redistribute it and/or
6 : modify it under the terms of the GNU Lesser General Public
7 : License as published by the Free Software Foundation; either
8 : version 2.1 of the License, or (at your option) any later version.
9 :
10 : The GNU C Library is distributed in the hope that it will be useful,
11 : but WITHOUT ANY WARRANTY; without even the implied warranty of
12 : MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 : Lesser General Public License for more details.
14 :
15 : You should have received a copy of the GNU Lesser General Public
16 : License along with the GNU C Library; if not, see
17 : <https://www.gnu.org/licenses/>. */
18 :
19 : #ifndef _UNISTD_H
20 : # error "Never include <bits/unistd.h> directly; use <unistd.h> instead."
21 : #endif
22 :
23 : extern ssize_t __read_chk (int __fd, void *__buf, size_t __nbytes,
24 : size_t __buflen) __wur;
25 : extern ssize_t __REDIRECT (__read_alias, (int __fd, void *__buf,
26 : size_t __nbytes), read) __wur;
27 : extern ssize_t __REDIRECT (__read_chk_warn,
28 : (int __fd, void *__buf, size_t __nbytes,
29 : size_t __buflen), __read_chk)
30 : __wur __warnattr ("read called with bigger length than size of "
31 : "the destination buffer");
32 :
33 : __fortify_function __wur ssize_t
34 0 : read (int __fd, void *__buf, size_t __nbytes)
35 : {
36 0 : if (__bos0 (__buf) != (size_t) -1)
37 : {
38 0 : if (!__builtin_constant_p (__nbytes))
39 : return __read_chk (__fd, __buf, __nbytes, __bos0 (__buf));
40 :
41 0 : if (__nbytes > __bos0 (__buf))
42 0 : return __read_chk_warn (__fd, __buf, __nbytes, __bos0 (__buf));
43 : }
44 0 : return __read_alias (__fd, __buf, __nbytes);
45 : }
46 :
47 : #ifdef __USE_UNIX98
48 : extern ssize_t __pread_chk (int __fd, void *__buf, size_t __nbytes,
49 : __off_t __offset, size_t __bufsize) __wur;
50 : extern ssize_t __pread64_chk (int __fd, void *__buf, size_t __nbytes,
51 : __off64_t __offset, size_t __bufsize) __wur;
52 : extern ssize_t __REDIRECT (__pread_alias,
53 : (int __fd, void *__buf, size_t __nbytes,
54 : __off_t __offset), pread) __wur;
55 : extern ssize_t __REDIRECT (__pread64_alias,
56 : (int __fd, void *__buf, size_t __nbytes,
57 : __off64_t __offset), pread64) __wur;
58 : extern ssize_t __REDIRECT (__pread_chk_warn,
59 : (int __fd, void *__buf, size_t __nbytes,
60 : __off_t __offset, size_t __bufsize), __pread_chk)
61 : __wur __warnattr ("pread called with bigger length than size of "
62 : "the destination buffer");
63 : extern ssize_t __REDIRECT (__pread64_chk_warn,
64 : (int __fd, void *__buf, size_t __nbytes,
65 : __off64_t __offset, size_t __bufsize),
66 : __pread64_chk)
67 : __wur __warnattr ("pread64 called with bigger length than size of "
68 : "the destination buffer");
69 :
70 : # ifndef __USE_FILE_OFFSET64
71 : __fortify_function __wur ssize_t
72 : pread (int __fd, void *__buf, size_t __nbytes, __off_t __offset)
73 : {
74 : if (__bos0 (__buf) != (size_t) -1)
75 : {
76 : if (!__builtin_constant_p (__nbytes))
77 : return __pread_chk (__fd, __buf, __nbytes, __offset, __bos0 (__buf));
78 :
79 : if ( __nbytes > __bos0 (__buf))
80 : return __pread_chk_warn (__fd, __buf, __nbytes, __offset,
81 : __bos0 (__buf));
82 : }
83 : return __pread_alias (__fd, __buf, __nbytes, __offset);
84 : }
85 : # else
86 : __fortify_function __wur ssize_t
87 : pread (int __fd, void *__buf, size_t __nbytes, __off64_t __offset)
88 : {
89 : if (__bos0 (__buf) != (size_t) -1)
90 : {
91 : if (!__builtin_constant_p (__nbytes))
92 : return __pread64_chk (__fd, __buf, __nbytes, __offset, __bos0 (__buf));
93 :
94 : if ( __nbytes > __bos0 (__buf))
95 : return __pread64_chk_warn (__fd, __buf, __nbytes, __offset,
96 : __bos0 (__buf));
97 : }
98 :
99 : return __pread64_alias (__fd, __buf, __nbytes, __offset);
100 : }
101 : # endif
102 :
103 : # ifdef __USE_LARGEFILE64
104 : __fortify_function __wur ssize_t
105 : pread64 (int __fd, void *__buf, size_t __nbytes, __off64_t __offset)
106 : {
107 : if (__bos0 (__buf) != (size_t) -1)
108 : {
109 : if (!__builtin_constant_p (__nbytes))
110 : return __pread64_chk (__fd, __buf, __nbytes, __offset, __bos0 (__buf));
111 :
112 : if ( __nbytes > __bos0 (__buf))
113 : return __pread64_chk_warn (__fd, __buf, __nbytes, __offset,
114 : __bos0 (__buf));
115 : }
116 :
117 : return __pread64_alias (__fd, __buf, __nbytes, __offset);
118 : }
119 : # endif
120 : #endif
121 :
122 : #if defined __USE_XOPEN_EXTENDED || defined __USE_XOPEN2K
123 : extern ssize_t __readlink_chk (const char *__restrict __path,
124 : char *__restrict __buf, size_t __len,
125 : size_t __buflen)
126 : __THROW __nonnull ((1, 2)) __wur;
127 : extern ssize_t __REDIRECT_NTH (__readlink_alias,
128 : (const char *__restrict __path,
129 : char *__restrict __buf, size_t __len), readlink)
130 : __nonnull ((1, 2)) __wur;
131 : extern ssize_t __REDIRECT_NTH (__readlink_chk_warn,
132 : (const char *__restrict __path,
133 : char *__restrict __buf, size_t __len,
134 : size_t __buflen), __readlink_chk)
135 : __nonnull ((1, 2)) __wur __warnattr ("readlink called with bigger length "
136 : "than size of destination buffer");
137 :
138 : __fortify_function __nonnull ((1, 2)) __wur ssize_t
139 : __NTH (readlink (const char *__restrict __path, char *__restrict __buf,
140 : size_t __len))
141 : {
142 : if (__bos (__buf) != (size_t) -1)
143 : {
144 : if (!__builtin_constant_p (__len))
145 : return __readlink_chk (__path, __buf, __len, __bos (__buf));
146 :
147 : if ( __len > __bos (__buf))
148 : return __readlink_chk_warn (__path, __buf, __len, __bos (__buf));
149 : }
150 : return __readlink_alias (__path, __buf, __len);
151 : }
152 : #endif
153 :
154 : #ifdef __USE_ATFILE
155 : extern ssize_t __readlinkat_chk (int __fd, const char *__restrict __path,
156 : char *__restrict __buf, size_t __len,
157 : size_t __buflen)
158 : __THROW __nonnull ((2, 3)) __wur;
159 : extern ssize_t __REDIRECT_NTH (__readlinkat_alias,
160 : (int __fd, const char *__restrict __path,
161 : char *__restrict __buf, size_t __len),
162 : readlinkat)
163 : __nonnull ((2, 3)) __wur;
164 : extern ssize_t __REDIRECT_NTH (__readlinkat_chk_warn,
165 : (int __fd, const char *__restrict __path,
166 : char *__restrict __buf, size_t __len,
167 : size_t __buflen), __readlinkat_chk)
168 : __nonnull ((2, 3)) __wur __warnattr ("readlinkat called with bigger "
169 : "length than size of destination "
170 : "buffer");
171 :
172 : __fortify_function __nonnull ((2, 3)) __wur ssize_t
173 : __NTH (readlinkat (int __fd, const char *__restrict __path,
174 : char *__restrict __buf, size_t __len))
175 : {
176 : if (__bos (__buf) != (size_t) -1)
177 : {
178 : if (!__builtin_constant_p (__len))
179 : return __readlinkat_chk (__fd, __path, __buf, __len, __bos (__buf));
180 :
181 : if (__len > __bos (__buf))
182 : return __readlinkat_chk_warn (__fd, __path, __buf, __len,
183 : __bos (__buf));
184 : }
185 : return __readlinkat_alias (__fd, __path, __buf, __len);
186 : }
187 : #endif
188 :
189 : extern char *__getcwd_chk (char *__buf, size_t __size, size_t __buflen)
190 : __THROW __wur;
191 : extern char *__REDIRECT_NTH (__getcwd_alias,
192 : (char *__buf, size_t __size), getcwd) __wur;
193 : extern char *__REDIRECT_NTH (__getcwd_chk_warn,
194 : (char *__buf, size_t __size, size_t __buflen),
195 : __getcwd_chk)
196 : __wur __warnattr ("getcwd caller with bigger length than size of "
197 : "destination buffer");
198 :
199 : __fortify_function __wur char *
200 681 : __NTH (getcwd (char *__buf, size_t __size))
201 : {
202 681 : if (__bos (__buf) != (size_t) -1)
203 : {
204 361 : if (!__builtin_constant_p (__size))
205 0 : return __getcwd_chk (__buf, __size, __bos (__buf));
206 :
207 361 : if (__size > __bos (__buf))
208 0 : return __getcwd_chk_warn (__buf, __size, __bos (__buf));
209 : }
210 681 : return __getcwd_alias (__buf, __size);
211 : }
212 :
213 : #if defined __USE_MISC || defined __USE_XOPEN_EXTENDED
214 : extern char *__getwd_chk (char *__buf, size_t buflen)
215 : __THROW __nonnull ((1)) __wur;
216 : extern char *__REDIRECT_NTH (__getwd_warn, (char *__buf), getwd)
217 : __nonnull ((1)) __wur __warnattr ("please use getcwd instead, as getwd "
218 : "doesn't specify buffer size");
219 :
220 : __fortify_function __nonnull ((1)) __attribute_deprecated__ __wur char *
221 : __NTH (getwd (char *__buf))
222 : {
223 : if (__bos (__buf) != (size_t) -1)
224 : return __getwd_chk (__buf, __bos (__buf));
225 : return __getwd_warn (__buf);
226 : }
227 : #endif
228 :
229 : extern size_t __confstr_chk (int __name, char *__buf, size_t __len,
230 : size_t __buflen) __THROW;
231 : extern size_t __REDIRECT_NTH (__confstr_alias, (int __name, char *__buf,
232 : size_t __len), confstr);
233 : extern size_t __REDIRECT_NTH (__confstr_chk_warn,
234 : (int __name, char *__buf, size_t __len,
235 : size_t __buflen), __confstr_chk)
236 : __warnattr ("confstr called with bigger length than size of destination "
237 : "buffer");
238 :
239 : __fortify_function size_t
240 : __NTH (confstr (int __name, char *__buf, size_t __len))
241 : {
242 : if (__bos (__buf) != (size_t) -1)
243 : {
244 : if (!__builtin_constant_p (__len))
245 : return __confstr_chk (__name, __buf, __len, __bos (__buf));
246 :
247 : if (__bos (__buf) < __len)
248 : return __confstr_chk_warn (__name, __buf, __len, __bos (__buf));
249 : }
250 : return __confstr_alias (__name, __buf, __len);
251 : }
252 :
253 :
254 : extern int __getgroups_chk (int __size, __gid_t __list[], size_t __listlen)
255 : __THROW __wur;
256 : extern int __REDIRECT_NTH (__getgroups_alias, (int __size, __gid_t __list[]),
257 : getgroups) __wur;
258 : extern int __REDIRECT_NTH (__getgroups_chk_warn,
259 : (int __size, __gid_t __list[], size_t __listlen),
260 : __getgroups_chk)
261 : __wur __warnattr ("getgroups called with bigger group count than what "
262 : "can fit into destination buffer");
263 :
264 : __fortify_function int
265 : __NTH (getgroups (int __size, __gid_t __list[]))
266 : {
267 : if (__bos (__list) != (size_t) -1)
268 : {
269 : if (!__builtin_constant_p (__size) || __size < 0)
270 : return __getgroups_chk (__size, __list, __bos (__list));
271 :
272 : if (__size * sizeof (__gid_t) > __bos (__list))
273 : return __getgroups_chk_warn (__size, __list, __bos (__list));
274 : }
275 : return __getgroups_alias (__size, __list);
276 : }
277 :
278 :
279 : extern int __ttyname_r_chk (int __fd, char *__buf, size_t __buflen,
280 : size_t __nreal) __THROW __nonnull ((2));
281 : extern int __REDIRECT_NTH (__ttyname_r_alias, (int __fd, char *__buf,
282 : size_t __buflen), ttyname_r)
283 : __nonnull ((2));
284 : extern int __REDIRECT_NTH (__ttyname_r_chk_warn,
285 : (int __fd, char *__buf, size_t __buflen,
286 : size_t __nreal), __ttyname_r_chk)
287 : __nonnull ((2)) __warnattr ("ttyname_r called with bigger buflen than "
288 : "size of destination buffer");
289 :
290 : __fortify_function int
291 : __NTH (ttyname_r (int __fd, char *__buf, size_t __buflen))
292 : {
293 : if (__bos (__buf) != (size_t) -1)
294 : {
295 : if (!__builtin_constant_p (__buflen))
296 : return __ttyname_r_chk (__fd, __buf, __buflen, __bos (__buf));
297 :
298 : if (__buflen > __bos (__buf))
299 : return __ttyname_r_chk_warn (__fd, __buf, __buflen, __bos (__buf));
300 : }
301 : return __ttyname_r_alias (__fd, __buf, __buflen);
302 : }
303 :
304 :
305 : #ifdef __USE_POSIX199506
306 : extern int __getlogin_r_chk (char *__buf, size_t __buflen, size_t __nreal)
307 : __nonnull ((1));
308 : extern int __REDIRECT (__getlogin_r_alias, (char *__buf, size_t __buflen),
309 : getlogin_r) __nonnull ((1));
310 : extern int __REDIRECT (__getlogin_r_chk_warn,
311 : (char *__buf, size_t __buflen, size_t __nreal),
312 : __getlogin_r_chk)
313 : __nonnull ((1)) __warnattr ("getlogin_r called with bigger buflen than "
314 : "size of destination buffer");
315 :
316 : __fortify_function int
317 : getlogin_r (char *__buf, size_t __buflen)
318 : {
319 : if (__bos (__buf) != (size_t) -1)
320 : {
321 : if (!__builtin_constant_p (__buflen))
322 : return __getlogin_r_chk (__buf, __buflen, __bos (__buf));
323 :
324 : if (__buflen > __bos (__buf))
325 : return __getlogin_r_chk_warn (__buf, __buflen, __bos (__buf));
326 : }
327 : return __getlogin_r_alias (__buf, __buflen);
328 : }
329 : #endif
330 :
331 :
332 : #if defined __USE_MISC || defined __USE_UNIX98
333 : extern int __gethostname_chk (char *__buf, size_t __buflen, size_t __nreal)
334 : __THROW __nonnull ((1));
335 : extern int __REDIRECT_NTH (__gethostname_alias, (char *__buf, size_t __buflen),
336 : gethostname) __nonnull ((1));
337 : extern int __REDIRECT_NTH (__gethostname_chk_warn,
338 : (char *__buf, size_t __buflen, size_t __nreal),
339 : __gethostname_chk)
340 : __nonnull ((1)) __warnattr ("gethostname called with bigger buflen than "
341 : "size of destination buffer");
342 :
343 : __fortify_function int
344 : __NTH (gethostname (char *__buf, size_t __buflen))
345 : {
346 : if (__bos (__buf) != (size_t) -1)
347 : {
348 : if (!__builtin_constant_p (__buflen))
349 : return __gethostname_chk (__buf, __buflen, __bos (__buf));
350 :
351 : if (__buflen > __bos (__buf))
352 : return __gethostname_chk_warn (__buf, __buflen, __bos (__buf));
353 : }
354 : return __gethostname_alias (__buf, __buflen);
355 : }
356 : #endif
357 :
358 :
359 : #if defined __USE_MISC || (defined __USE_XOPEN && !defined __USE_UNIX98)
360 : extern int __getdomainname_chk (char *__buf, size_t __buflen, size_t __nreal)
361 : __THROW __nonnull ((1)) __wur;
362 : extern int __REDIRECT_NTH (__getdomainname_alias, (char *__buf,
363 : size_t __buflen),
364 : getdomainname) __nonnull ((1)) __wur;
365 : extern int __REDIRECT_NTH (__getdomainname_chk_warn,
366 : (char *__buf, size_t __buflen, size_t __nreal),
367 : __getdomainname_chk)
368 : __nonnull ((1)) __wur __warnattr ("getdomainname called with bigger "
369 : "buflen than size of destination "
370 : "buffer");
371 :
372 : __fortify_function int
373 : __NTH (getdomainname (char *__buf, size_t __buflen))
374 : {
375 : if (__bos (__buf) != (size_t) -1)
376 : {
377 : if (!__builtin_constant_p (__buflen))
378 : return __getdomainname_chk (__buf, __buflen, __bos (__buf));
379 :
380 : if (__buflen > __bos (__buf))
381 : return __getdomainname_chk_warn (__buf, __buflen, __bos (__buf));
382 : }
383 : return __getdomainname_alias (__buf, __buflen);
384 : }
385 : #endif
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