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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
043f46f6
MS
11static bool nsec_valid(long nsec)
12{
4cca9226 13 if (nsec == UTIME_OMIT || nsec == UTIME_NOW)
043f46f6
MS
14 return true;
15
16 return nsec >= 0 && nsec <= 999999999;
17}
18
aaed2dd8 19static int utimes_common(const struct path *path, struct timespec64 *times)
82b0547c
AD
20{
21 int error;
82b0547c 22 struct iattr newattrs;
e9b76fed 23 struct inode *inode = path->dentry->d_inode;
27ac0ffe 24 struct inode *delegated_inode = NULL;
82b0547c 25
e9b76fed 26 error = mnt_want_write(path->mnt);
74f9fdfa 27 if (error)
e9b76fed 28 goto out;
82b0547c 29
12fd0d30
MK
30 if (times && times[0].tv_nsec == UTIME_NOW &&
31 times[1].tv_nsec == UTIME_NOW)
32 times = NULL;
33
82b0547c
AD
34 newattrs.ia_valid = ATTR_CTIME | ATTR_MTIME | ATTR_ATIME;
35 if (times) {
1c710c89
UD
36 if (times[0].tv_nsec == UTIME_OMIT)
37 newattrs.ia_valid &= ~ATTR_ATIME;
38 else if (times[0].tv_nsec != UTIME_NOW) {
39 newattrs.ia_atime.tv_sec = times[0].tv_sec;
40 newattrs.ia_atime.tv_nsec = times[0].tv_nsec;
41 newattrs.ia_valid |= ATTR_ATIME_SET;
42 }
43
44 if (times[1].tv_nsec == UTIME_OMIT)
45 newattrs.ia_valid &= ~ATTR_MTIME;
46 else if (times[1].tv_nsec != UTIME_NOW) {
47 newattrs.ia_mtime.tv_sec = times[1].tv_sec;
48 newattrs.ia_mtime.tv_nsec = times[1].tv_nsec;
49 newattrs.ia_valid |= ATTR_MTIME_SET;
50 }
4cca9226 51 /*
31051c85 52 * Tell setattr_prepare(), that this is an explicit time
9767d749
MS
53 * update, even if neither ATTR_ATIME_SET nor ATTR_MTIME_SET
54 * were used.
4cca9226 55 */
9767d749 56 newattrs.ia_valid |= ATTR_TIMES_SET;
4cca9226 57 } else {
f2b20f6e 58 newattrs.ia_valid |= ATTR_TOUCH;
82b0547c 59 }
27ac0ffe 60retry_deleg:
5955102c 61 inode_lock(inode);
27ac0ffe 62 error = notify_change(path->dentry, &newattrs, &delegated_inode);
5955102c 63 inode_unlock(inode);
27ac0ffe
BF
64 if (delegated_inode) {
65 error = break_deleg_wait(&delegated_inode);
66 if (!error)
67 goto retry_deleg;
68 }
e9b76fed 69
e9b76fed
MS
70 mnt_drop_write(path->mnt);
71out:
72 return error;
73}
74
75/*
76 * do_utimes - change times on filename or file descriptor
77 * @dfd: open file descriptor, -1 or AT_FDCWD
78 * @filename: path name or NULL
79 * @times: new times or NULL
80 * @flags: zero or more flags (only AT_SYMLINK_NOFOLLOW for the moment)
81 *
82 * If filename is NULL and dfd refers to an open file, then operate on
83 * the file. Otherwise look up filename, possibly using dfd as a
84 * starting point.
85 *
86 * If times==NULL, set access and modification to current time,
87 * must be owner or have write permission.
88 * Else, update from *times, must be owner or super user.
89 */
aaed2dd8 90long do_utimes(int dfd, const char __user *filename, struct timespec64 *times,
c7887325 91 int flags)
e9b76fed
MS
92{
93 int error = -EINVAL;
94
95 if (times && (!nsec_valid(times[0].tv_nsec) ||
96 !nsec_valid(times[1].tv_nsec))) {
97 goto out;
98 }
99
100 if (flags & ~AT_SYMLINK_NOFOLLOW)
101 goto out;
102
103 if (filename == NULL && dfd != AT_FDCWD) {
2903ff01 104 struct fd f;
e9b76fed
MS
105
106 if (flags & AT_SYMLINK_NOFOLLOW)
107 goto out;
108
2903ff01 109 f = fdget(dfd);
e9b76fed 110 error = -EBADF;
2903ff01 111 if (!f.file)
e9b76fed
MS
112 goto out;
113
2903ff01
AV
114 error = utimes_common(&f.file->f_path, times);
115 fdput(f);
e9b76fed 116 } else {
2d8f3038 117 struct path path;
e9b76fed
MS
118 int lookup_flags = 0;
119
120 if (!(flags & AT_SYMLINK_NOFOLLOW))
121 lookup_flags |= LOOKUP_FOLLOW;
a69201d6 122retry:
2d8f3038 123 error = user_path_at(dfd, filename, lookup_flags, &path);
e9b76fed
MS
124 if (error)
125 goto out;
126
2d8f3038
AV
127 error = utimes_common(&path, times);
128 path_put(&path);
a69201d6
JL
129 if (retry_estale(error, lookup_flags)) {
130 lookup_flags |= LOOKUP_REVAL;
131 goto retry;
132 }
e9b76fed
MS
133 }
134
82b0547c
AD
135out:
136 return error;
137}
138
c7887325 139SYSCALL_DEFINE4(utimensat, int, dfd, const char __user *, filename,
a4f7a300 140 struct __kernel_timespec __user *, utimes, int, flags)
1c710c89 141{
aaed2dd8 142 struct timespec64 tstimes[2];
1c710c89
UD
143
144 if (utimes) {
aaed2dd8
DD
145 if ((get_timespec64(&tstimes[0], &utimes[0]) ||
146 get_timespec64(&tstimes[1], &utimes[1])))
1c710c89 147 return -EFAULT;
1c710c89
UD
148
149 /* Nothing to do, we must not even check the path. */
150 if (tstimes[0].tv_nsec == UTIME_OMIT &&
151 tstimes[1].tv_nsec == UTIME_OMIT)
152 return 0;
153 }
154
155 return do_utimes(dfd, filename, utimes ? tstimes : NULL, flags);
156}
157
185cfaf7
AB
158#ifdef __ARCH_WANT_SYS_UTIME
159/*
160 * futimesat(), utimes() and utime() are older versions of utimensat()
161 * that are provided for compatibility with traditional C libraries.
162 * On modern architectures, we always use libc wrappers around
163 * utimensat() instead.
164 */
f1390358
DB
165static long do_futimesat(int dfd, const char __user *filename,
166 struct timeval __user *utimes)
82b0547c
AD
167{
168 struct timeval times[2];
aaed2dd8 169 struct timespec64 tstimes[2];
1c710c89
UD
170
171 if (utimes) {
172 if (copy_from_user(&times, utimes, sizeof(times)))
173 return -EFAULT;
174
175 /* This test is needed to catch all invalid values. If we
176 would test only in do_utimes we would miss those invalid
177 values truncated by the multiplication with 1000. Note
178 that we also catch UTIME_{NOW,OMIT} here which are only
179 valid for utimensat. */
180 if (times[0].tv_usec >= 1000000 || times[0].tv_usec < 0 ||
181 times[1].tv_usec >= 1000000 || times[1].tv_usec < 0)
182 return -EINVAL;
183
184 tstimes[0].tv_sec = times[0].tv_sec;
185 tstimes[0].tv_nsec = 1000 * times[0].tv_usec;
186 tstimes[1].tv_sec = times[1].tv_sec;
187 tstimes[1].tv_nsec = 1000 * times[1].tv_usec;
188 }
82b0547c 189
1c710c89 190 return do_utimes(dfd, filename, utimes ? tstimes : NULL, 0);
82b0547c
AD
191}
192
f1390358
DB
193
194SYSCALL_DEFINE3(futimesat, int, dfd, const char __user *, filename,
195 struct timeval __user *, utimes)
196{
197 return do_futimesat(dfd, filename, utimes);
198}
199
003d7ab4
HC
200SYSCALL_DEFINE2(utimes, char __user *, filename,
201 struct timeval __user *, utimes)
82b0547c 202{
f1390358 203 return do_futimesat(AT_FDCWD, filename, utimes);
82b0547c 204}
1a060ba3 205
185cfaf7
AB
206SYSCALL_DEFINE2(utime, char __user *, filename, struct utimbuf __user *, times)
207{
208 struct timespec64 tv[2];
209
210 if (times) {
211 if (get_user(tv[0].tv_sec, &times->actime) ||
212 get_user(tv[1].tv_sec, &times->modtime))
213 return -EFAULT;
214 tv[0].tv_nsec = 0;
215 tv[1].tv_nsec = 0;
216 }
217 return do_utimes(AT_FDCWD, filename, times ? tv : NULL, 0);
218}
219#endif
220
4faea239 221#ifdef CONFIG_COMPAT_32BIT_TIME
1a060ba3
AV
222/*
223 * Not all architectures have sys_utime, so implement this in terms
224 * of sys_utimes.
225 */
4faea239 226#ifdef __ARCH_WANT_SYS_UTIME32
8dabe724
AB
227SYSCALL_DEFINE2(utime32, const char __user *, filename,
228 struct old_utimbuf32 __user *, t)
1a060ba3 229{
aaed2dd8 230 struct timespec64 tv[2];
1a060ba3
AV
231
232 if (t) {
233 if (get_user(tv[0].tv_sec, &t->actime) ||
234 get_user(tv[1].tv_sec, &t->modtime))
235 return -EFAULT;
236 tv[0].tv_nsec = 0;
237 tv[1].tv_nsec = 0;
238 }
239 return do_utimes(AT_FDCWD, filename, t ? tv : NULL, 0);
240}
4faea239 241#endif
1a060ba3 242
8dabe724 243SYSCALL_DEFINE4(utimensat_time32, unsigned int, dfd, const char __user *, filename, struct old_timespec32 __user *, t, int, flags)
1a060ba3 244{
aaed2dd8 245 struct timespec64 tv[2];
1a060ba3
AV
246
247 if (t) {
9afc5eee
AB
248 if (get_old_timespec32(&tv[0], &t[0]) ||
249 get_old_timespec32(&tv[1], &t[1]))
1a060ba3
AV
250 return -EFAULT;
251
252 if (tv[0].tv_nsec == UTIME_OMIT && tv[1].tv_nsec == UTIME_OMIT)
253 return 0;
254 }
255 return do_utimes(dfd, filename, t ? tv : NULL, flags);
256}
257
4faea239 258#ifdef __ARCH_WANT_SYS_UTIME32
ab641afa 259static long do_compat_futimesat(unsigned int dfd, const char __user *filename,
9afc5eee 260 struct old_timeval32 __user *t)
1a060ba3 261{
aaed2dd8 262 struct timespec64 tv[2];
1a060ba3
AV
263
264 if (t) {
265 if (get_user(tv[0].tv_sec, &t[0].tv_sec) ||
266 get_user(tv[0].tv_nsec, &t[0].tv_usec) ||
267 get_user(tv[1].tv_sec, &t[1].tv_sec) ||
268 get_user(tv[1].tv_nsec, &t[1].tv_usec))
269 return -EFAULT;
270 if (tv[0].tv_nsec >= 1000000 || tv[0].tv_nsec < 0 ||
271 tv[1].tv_nsec >= 1000000 || tv[1].tv_nsec < 0)
272 return -EINVAL;
273 tv[0].tv_nsec *= 1000;
274 tv[1].tv_nsec *= 1000;
275 }
276 return do_utimes(dfd, filename, t ? tv : NULL, 0);
277}
278
8dabe724 279SYSCALL_DEFINE3(futimesat_time32, unsigned int, dfd,
ab641afa 280 const char __user *, filename,
9afc5eee 281 struct old_timeval32 __user *, t)
ab641afa
DB
282{
283 return do_compat_futimesat(dfd, filename, t);
284}
285
8dabe724 286SYSCALL_DEFINE2(utimes_time32, const char __user *, filename, struct old_timeval32 __user *, t)
1a060ba3 287{
ab641afa 288 return do_compat_futimesat(AT_FDCWD, filename, t);
1a060ba3
AV
289}
290#endif
4faea239 291#endif