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Merge branch 'irq-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel...
[mirror_ubuntu-eoan-kernel.git] / fs / utimes.c
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b2441318 1// SPDX-License-Identifier: GPL-2.0
1c710c89 2#include <linux/file.h>
74f9fdfa 3#include <linux/mount.h>
82b0547c
AD
4#include <linux/namei.h>
5#include <linux/utime.h>
12c2ab5e 6#include <linux/syscalls.h>
7c0f6ba6 7#include <linux/uaccess.h>
1a060ba3 8#include <linux/compat.h>
82b0547c
AD
9#include <asm/unistd.h>
10
11#ifdef __ARCH_WANT_SYS_UTIME
12
13/*
14 * sys_utime() can be implemented in user-level using sys_utimes().
15 * Is this for backwards compatibility? If so, why not move it
16 * into the appropriate arch directory (for those architectures that
17 * need it).
18 */
19
20/* If times==NULL, set access and modification to current time,
21 * must be owner or have write permission.
22 * Else, update from *times, must be owner or super user.
23 */
003d7ab4 24SYSCALL_DEFINE2(utime, char __user *, filename, struct utimbuf __user *, times)
82b0547c 25{
aaed2dd8 26 struct timespec64 tv[2];
82b0547c 27
82b0547c 28 if (times) {
1c710c89
UD
29 if (get_user(tv[0].tv_sec, &times->actime) ||
30 get_user(tv[1].tv_sec, &times->modtime))
31 return -EFAULT;
32 tv[0].tv_nsec = 0;
33 tv[1].tv_nsec = 0;
82b0547c 34 }
1c710c89 35 return do_utimes(AT_FDCWD, filename, times ? tv : NULL, 0);
82b0547c
AD
36}
37
38#endif
39
043f46f6
MS
40static bool nsec_valid(long nsec)
41{
4cca9226 42 if (nsec == UTIME_OMIT || nsec == UTIME_NOW)
043f46f6
MS
43 return true;
44
45 return nsec >= 0 && nsec <= 999999999;
46}
47
aaed2dd8 48static int utimes_common(const struct path *path, struct timespec64 *times)
82b0547c
AD
49{
50 int error;
82b0547c 51 struct iattr newattrs;
e9b76fed 52 struct inode *inode = path->dentry->d_inode;
27ac0ffe 53 struct inode *delegated_inode = NULL;
82b0547c 54
e9b76fed 55 error = mnt_want_write(path->mnt);
74f9fdfa 56 if (error)
e9b76fed 57 goto out;
82b0547c 58
12fd0d30
MK
59 if (times && times[0].tv_nsec == UTIME_NOW &&
60 times[1].tv_nsec == UTIME_NOW)
61 times = NULL;
62
82b0547c
AD
63 newattrs.ia_valid = ATTR_CTIME | ATTR_MTIME | ATTR_ATIME;
64 if (times) {
1c710c89
UD
65 if (times[0].tv_nsec == UTIME_OMIT)
66 newattrs.ia_valid &= ~ATTR_ATIME;
67 else if (times[0].tv_nsec != UTIME_NOW) {
68 newattrs.ia_atime.tv_sec = times[0].tv_sec;
69 newattrs.ia_atime.tv_nsec = times[0].tv_nsec;
70 newattrs.ia_valid |= ATTR_ATIME_SET;
71 }
72
73 if (times[1].tv_nsec == UTIME_OMIT)
74 newattrs.ia_valid &= ~ATTR_MTIME;
75 else if (times[1].tv_nsec != UTIME_NOW) {
76 newattrs.ia_mtime.tv_sec = times[1].tv_sec;
77 newattrs.ia_mtime.tv_nsec = times[1].tv_nsec;
78 newattrs.ia_valid |= ATTR_MTIME_SET;
79 }
4cca9226 80 /*
31051c85 81 * Tell setattr_prepare(), that this is an explicit time
9767d749
MS
82 * update, even if neither ATTR_ATIME_SET nor ATTR_MTIME_SET
83 * were used.
4cca9226 84 */
9767d749 85 newattrs.ia_valid |= ATTR_TIMES_SET;
4cca9226 86 } else {
f2b20f6e 87 newattrs.ia_valid |= ATTR_TOUCH;
82b0547c 88 }
27ac0ffe 89retry_deleg:
5955102c 90 inode_lock(inode);
27ac0ffe 91 error = notify_change(path->dentry, &newattrs, &delegated_inode);
5955102c 92 inode_unlock(inode);
27ac0ffe
BF
93 if (delegated_inode) {
94 error = break_deleg_wait(&delegated_inode);
95 if (!error)
96 goto retry_deleg;
97 }
e9b76fed 98
e9b76fed
MS
99 mnt_drop_write(path->mnt);
100out:
101 return error;
102}
103
104/*
105 * do_utimes - change times on filename or file descriptor
106 * @dfd: open file descriptor, -1 or AT_FDCWD
107 * @filename: path name or NULL
108 * @times: new times or NULL
109 * @flags: zero or more flags (only AT_SYMLINK_NOFOLLOW for the moment)
110 *
111 * If filename is NULL and dfd refers to an open file, then operate on
112 * the file. Otherwise look up filename, possibly using dfd as a
113 * starting point.
114 *
115 * If times==NULL, set access and modification to current time,
116 * must be owner or have write permission.
117 * Else, update from *times, must be owner or super user.
118 */
aaed2dd8 119long do_utimes(int dfd, const char __user *filename, struct timespec64 *times,
c7887325 120 int flags)
e9b76fed
MS
121{
122 int error = -EINVAL;
123
124 if (times && (!nsec_valid(times[0].tv_nsec) ||
125 !nsec_valid(times[1].tv_nsec))) {
126 goto out;
127 }
128
129 if (flags & ~AT_SYMLINK_NOFOLLOW)
130 goto out;
131
132 if (filename == NULL && dfd != AT_FDCWD) {
2903ff01 133 struct fd f;
e9b76fed
MS
134
135 if (flags & AT_SYMLINK_NOFOLLOW)
136 goto out;
137
2903ff01 138 f = fdget(dfd);
e9b76fed 139 error = -EBADF;
2903ff01 140 if (!f.file)
e9b76fed
MS
141 goto out;
142
2903ff01
AV
143 error = utimes_common(&f.file->f_path, times);
144 fdput(f);
e9b76fed 145 } else {
2d8f3038 146 struct path path;
e9b76fed
MS
147 int lookup_flags = 0;
148
149 if (!(flags & AT_SYMLINK_NOFOLLOW))
150 lookup_flags |= LOOKUP_FOLLOW;
a69201d6 151retry:
2d8f3038 152 error = user_path_at(dfd, filename, lookup_flags, &path);
e9b76fed
MS
153 if (error)
154 goto out;
155
2d8f3038
AV
156 error = utimes_common(&path, times);
157 path_put(&path);
a69201d6
JL
158 if (retry_estale(error, lookup_flags)) {
159 lookup_flags |= LOOKUP_REVAL;
160 goto retry;
161 }
e9b76fed
MS
162 }
163
82b0547c
AD
164out:
165 return error;
166}
167
c7887325 168SYSCALL_DEFINE4(utimensat, int, dfd, const char __user *, filename,
6559eed8 169 struct timespec __user *, utimes, int, flags)
1c710c89 170{
aaed2dd8 171 struct timespec64 tstimes[2];
1c710c89
UD
172
173 if (utimes) {
aaed2dd8
DD
174 if ((get_timespec64(&tstimes[0], &utimes[0]) ||
175 get_timespec64(&tstimes[1], &utimes[1])))
1c710c89 176 return -EFAULT;
1c710c89
UD
177
178 /* Nothing to do, we must not even check the path. */
179 if (tstimes[0].tv_nsec == UTIME_OMIT &&
180 tstimes[1].tv_nsec == UTIME_OMIT)
181 return 0;
182 }
183
184 return do_utimes(dfd, filename, utimes ? tstimes : NULL, flags);
185}
186
f1390358
DB
187static long do_futimesat(int dfd, const char __user *filename,
188 struct timeval __user *utimes)
82b0547c
AD
189{
190 struct timeval times[2];
aaed2dd8 191 struct timespec64 tstimes[2];
1c710c89
UD
192
193 if (utimes) {
194 if (copy_from_user(&times, utimes, sizeof(times)))
195 return -EFAULT;
196
197 /* This test is needed to catch all invalid values. If we
198 would test only in do_utimes we would miss those invalid
199 values truncated by the multiplication with 1000. Note
200 that we also catch UTIME_{NOW,OMIT} here which are only
201 valid for utimensat. */
202 if (times[0].tv_usec >= 1000000 || times[0].tv_usec < 0 ||
203 times[1].tv_usec >= 1000000 || times[1].tv_usec < 0)
204 return -EINVAL;
205
206 tstimes[0].tv_sec = times[0].tv_sec;
207 tstimes[0].tv_nsec = 1000 * times[0].tv_usec;
208 tstimes[1].tv_sec = times[1].tv_sec;
209 tstimes[1].tv_nsec = 1000 * times[1].tv_usec;
210 }
82b0547c 211
1c710c89 212 return do_utimes(dfd, filename, utimes ? tstimes : NULL, 0);
82b0547c
AD
213}
214
f1390358
DB
215
216SYSCALL_DEFINE3(futimesat, int, dfd, const char __user *, filename,
217 struct timeval __user *, utimes)
218{
219 return do_futimesat(dfd, filename, utimes);
220}
221
003d7ab4
HC
222SYSCALL_DEFINE2(utimes, char __user *, filename,
223 struct timeval __user *, utimes)
82b0547c 224{
f1390358 225 return do_futimesat(AT_FDCWD, filename, utimes);
82b0547c 226}
1a060ba3
AV
227
228#ifdef CONFIG_COMPAT
229/*
230 * Not all architectures have sys_utime, so implement this in terms
231 * of sys_utimes.
232 */
233COMPAT_SYSCALL_DEFINE2(utime, const char __user *, filename,
234 struct compat_utimbuf __user *, t)
235{
aaed2dd8 236 struct timespec64 tv[2];
1a060ba3
AV
237
238 if (t) {
239 if (get_user(tv[0].tv_sec, &t->actime) ||
240 get_user(tv[1].tv_sec, &t->modtime))
241 return -EFAULT;
242 tv[0].tv_nsec = 0;
243 tv[1].tv_nsec = 0;
244 }
245 return do_utimes(AT_FDCWD, filename, t ? tv : NULL, 0);
246}
247
248COMPAT_SYSCALL_DEFINE4(utimensat, unsigned int, dfd, const char __user *, filename, struct compat_timespec __user *, t, int, flags)
249{
aaed2dd8 250 struct timespec64 tv[2];
1a060ba3
AV
251
252 if (t) {
aaed2dd8
DD
253 if (compat_get_timespec64(&tv[0], &t[0]) ||
254 compat_get_timespec64(&tv[1], &t[1]))
1a060ba3
AV
255 return -EFAULT;
256
257 if (tv[0].tv_nsec == UTIME_OMIT && tv[1].tv_nsec == UTIME_OMIT)
258 return 0;
259 }
260 return do_utimes(dfd, filename, t ? tv : NULL, flags);
261}
262
ab641afa
DB
263static long do_compat_futimesat(unsigned int dfd, const char __user *filename,
264 struct compat_timeval __user *t)
1a060ba3 265{
aaed2dd8 266 struct timespec64 tv[2];
1a060ba3
AV
267
268 if (t) {
269 if (get_user(tv[0].tv_sec, &t[0].tv_sec) ||
270 get_user(tv[0].tv_nsec, &t[0].tv_usec) ||
271 get_user(tv[1].tv_sec, &t[1].tv_sec) ||
272 get_user(tv[1].tv_nsec, &t[1].tv_usec))
273 return -EFAULT;
274 if (tv[0].tv_nsec >= 1000000 || tv[0].tv_nsec < 0 ||
275 tv[1].tv_nsec >= 1000000 || tv[1].tv_nsec < 0)
276 return -EINVAL;
277 tv[0].tv_nsec *= 1000;
278 tv[1].tv_nsec *= 1000;
279 }
280 return do_utimes(dfd, filename, t ? tv : NULL, 0);
281}
282
ab641afa
DB
283COMPAT_SYSCALL_DEFINE3(futimesat, unsigned int, dfd,
284 const char __user *, filename,
285 struct compat_timeval __user *, t)
286{
287 return do_compat_futimesat(dfd, filename, t);
288}
289
1a060ba3
AV
290COMPAT_SYSCALL_DEFINE2(utimes, const char __user *, filename, struct compat_timeval __user *, t)
291{
ab641afa 292 return do_compat_futimesat(AT_FDCWD, filename, t);
1a060ba3
AV
293}
294#endif