Commit | Line | Data |
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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 | 9 | #include <asm/unistd.h> |
5970e15d | 10 | #include <linux/filelock.h> |
82b0547c | 11 | |
043f46f6 MS |
12 | static bool nsec_valid(long nsec) |
13 | { | |
4cca9226 | 14 | if (nsec == UTIME_OMIT || nsec == UTIME_NOW) |
043f46f6 MS |
15 | return true; |
16 | ||
17 | return nsec >= 0 && nsec <= 999999999; | |
18 | } | |
19 | ||
fd5ad30c | 20 | int vfs_utimes(const struct path *path, struct timespec64 *times) |
82b0547c AD |
21 | { |
22 | int error; | |
82b0547c | 23 | struct iattr newattrs; |
e9b76fed | 24 | struct inode *inode = path->dentry->d_inode; |
27ac0ffe | 25 | struct inode *delegated_inode = NULL; |
82b0547c | 26 | |
27eb11c9 CH |
27 | if (times) { |
28 | if (!nsec_valid(times[0].tv_nsec) || | |
29 | !nsec_valid(times[1].tv_nsec)) | |
30 | return -EINVAL; | |
31 | if (times[0].tv_nsec == UTIME_NOW && | |
32 | times[1].tv_nsec == UTIME_NOW) | |
33 | times = NULL; | |
34 | } | |
35 | ||
e9b76fed | 36 | error = mnt_want_write(path->mnt); |
74f9fdfa | 37 | if (error) |
e9b76fed | 38 | goto out; |
82b0547c | 39 | |
82b0547c AD |
40 | newattrs.ia_valid = ATTR_CTIME | ATTR_MTIME | ATTR_ATIME; |
41 | if (times) { | |
1c710c89 UD |
42 | if (times[0].tv_nsec == UTIME_OMIT) |
43 | newattrs.ia_valid &= ~ATTR_ATIME; | |
44 | else if (times[0].tv_nsec != UTIME_NOW) { | |
eb31e2f6 | 45 | newattrs.ia_atime = times[0]; |
1c710c89 UD |
46 | newattrs.ia_valid |= ATTR_ATIME_SET; |
47 | } | |
48 | ||
49 | if (times[1].tv_nsec == UTIME_OMIT) | |
50 | newattrs.ia_valid &= ~ATTR_MTIME; | |
51 | else if (times[1].tv_nsec != UTIME_NOW) { | |
eb31e2f6 | 52 | newattrs.ia_mtime = times[1]; |
1c710c89 UD |
53 | newattrs.ia_valid |= ATTR_MTIME_SET; |
54 | } | |
4cca9226 | 55 | /* |
31051c85 | 56 | * Tell setattr_prepare(), that this is an explicit time |
9767d749 MS |
57 | * update, even if neither ATTR_ATIME_SET nor ATTR_MTIME_SET |
58 | * were used. | |
4cca9226 | 59 | */ |
9767d749 | 60 | newattrs.ia_valid |= ATTR_TIMES_SET; |
4cca9226 | 61 | } else { |
f2b20f6e | 62 | newattrs.ia_valid |= ATTR_TOUCH; |
82b0547c | 63 | } |
27ac0ffe | 64 | retry_deleg: |
5955102c | 65 | inode_lock(inode); |
abf08576 | 66 | error = notify_change(mnt_idmap(path->mnt), path->dentry, &newattrs, |
2f221d6f | 67 | &delegated_inode); |
5955102c | 68 | inode_unlock(inode); |
27ac0ffe BF |
69 | if (delegated_inode) { |
70 | error = break_deleg_wait(&delegated_inode); | |
71 | if (!error) | |
72 | goto retry_deleg; | |
73 | } | |
e9b76fed | 74 | |
e9b76fed MS |
75 | mnt_drop_write(path->mnt); |
76 | out: | |
77 | return error; | |
78 | } | |
79 | ||
9d4b74ae CH |
80 | static int do_utimes_path(int dfd, const char __user *filename, |
81 | struct timespec64 *times, int flags) | |
82 | { | |
83 | struct path path; | |
84 | int lookup_flags = 0, error; | |
85 | ||
9d4b74ae CH |
86 | if (flags & ~(AT_SYMLINK_NOFOLLOW | AT_EMPTY_PATH)) |
87 | return -EINVAL; | |
88 | ||
89 | if (!(flags & AT_SYMLINK_NOFOLLOW)) | |
90 | lookup_flags |= LOOKUP_FOLLOW; | |
91 | if (flags & AT_EMPTY_PATH) | |
92 | lookup_flags |= LOOKUP_EMPTY; | |
93 | ||
94 | retry: | |
95 | error = user_path_at(dfd, filename, lookup_flags, &path); | |
96 | if (error) | |
97 | return error; | |
98 | ||
fd5ad30c | 99 | error = vfs_utimes(&path, times); |
9d4b74ae CH |
100 | path_put(&path); |
101 | if (retry_estale(error, lookup_flags)) { | |
102 | lookup_flags |= LOOKUP_REVAL; | |
103 | goto retry; | |
104 | } | |
105 | ||
106 | return error; | |
107 | } | |
108 | ||
109 | static int do_utimes_fd(int fd, struct timespec64 *times, int flags) | |
110 | { | |
111 | struct fd f; | |
112 | int error; | |
113 | ||
9d4b74ae CH |
114 | if (flags) |
115 | return -EINVAL; | |
116 | ||
117 | f = fdget(fd); | |
118 | if (!f.file) | |
119 | return -EBADF; | |
fd5ad30c | 120 | error = vfs_utimes(&f.file->f_path, times); |
9d4b74ae CH |
121 | fdput(f); |
122 | return error; | |
123 | } | |
124 | ||
e9b76fed MS |
125 | /* |
126 | * do_utimes - change times on filename or file descriptor | |
127 | * @dfd: open file descriptor, -1 or AT_FDCWD | |
128 | * @filename: path name or NULL | |
129 | * @times: new times or NULL | |
130 | * @flags: zero or more flags (only AT_SYMLINK_NOFOLLOW for the moment) | |
131 | * | |
132 | * If filename is NULL and dfd refers to an open file, then operate on | |
133 | * the file. Otherwise look up filename, possibly using dfd as a | |
134 | * starting point. | |
135 | * | |
136 | * If times==NULL, set access and modification to current time, | |
137 | * must be owner or have write permission. | |
138 | * Else, update from *times, must be owner or super user. | |
139 | */ | |
aaed2dd8 | 140 | long do_utimes(int dfd, const char __user *filename, struct timespec64 *times, |
c7887325 | 141 | int flags) |
e9b76fed | 142 | { |
9d4b74ae CH |
143 | if (filename == NULL && dfd != AT_FDCWD) |
144 | return do_utimes_fd(dfd, times, flags); | |
145 | return do_utimes_path(dfd, filename, times, flags); | |
82b0547c AD |
146 | } |
147 | ||
c7887325 | 148 | SYSCALL_DEFINE4(utimensat, int, dfd, const char __user *, filename, |
a4f7a300 | 149 | struct __kernel_timespec __user *, utimes, int, flags) |
1c710c89 | 150 | { |
aaed2dd8 | 151 | struct timespec64 tstimes[2]; |
1c710c89 UD |
152 | |
153 | if (utimes) { | |
aaed2dd8 DD |
154 | if ((get_timespec64(&tstimes[0], &utimes[0]) || |
155 | get_timespec64(&tstimes[1], &utimes[1]))) | |
1c710c89 | 156 | return -EFAULT; |
1c710c89 UD |
157 | |
158 | /* Nothing to do, we must not even check the path. */ | |
159 | if (tstimes[0].tv_nsec == UTIME_OMIT && | |
160 | tstimes[1].tv_nsec == UTIME_OMIT) | |
161 | return 0; | |
162 | } | |
163 | ||
164 | return do_utimes(dfd, filename, utimes ? tstimes : NULL, flags); | |
165 | } | |
166 | ||
185cfaf7 AB |
167 | #ifdef __ARCH_WANT_SYS_UTIME |
168 | /* | |
169 | * futimesat(), utimes() and utime() are older versions of utimensat() | |
170 | * that are provided for compatibility with traditional C libraries. | |
171 | * On modern architectures, we always use libc wrappers around | |
172 | * utimensat() instead. | |
173 | */ | |
f1390358 | 174 | static long do_futimesat(int dfd, const char __user *filename, |
75d319c0 | 175 | struct __kernel_old_timeval __user *utimes) |
82b0547c | 176 | { |
75d319c0 | 177 | struct __kernel_old_timeval times[2]; |
aaed2dd8 | 178 | struct timespec64 tstimes[2]; |
1c710c89 UD |
179 | |
180 | if (utimes) { | |
181 | if (copy_from_user(×, utimes, sizeof(times))) | |
182 | return -EFAULT; | |
183 | ||
184 | /* This test is needed to catch all invalid values. If we | |
185 | would test only in do_utimes we would miss those invalid | |
186 | values truncated by the multiplication with 1000. Note | |
187 | that we also catch UTIME_{NOW,OMIT} here which are only | |
188 | valid for utimensat. */ | |
189 | if (times[0].tv_usec >= 1000000 || times[0].tv_usec < 0 || | |
190 | times[1].tv_usec >= 1000000 || times[1].tv_usec < 0) | |
191 | return -EINVAL; | |
192 | ||
193 | tstimes[0].tv_sec = times[0].tv_sec; | |
194 | tstimes[0].tv_nsec = 1000 * times[0].tv_usec; | |
195 | tstimes[1].tv_sec = times[1].tv_sec; | |
196 | tstimes[1].tv_nsec = 1000 * times[1].tv_usec; | |
197 | } | |
82b0547c | 198 | |
1c710c89 | 199 | return do_utimes(dfd, filename, utimes ? tstimes : NULL, 0); |
82b0547c AD |
200 | } |
201 | ||
f1390358 DB |
202 | |
203 | SYSCALL_DEFINE3(futimesat, int, dfd, const char __user *, filename, | |
75d319c0 | 204 | struct __kernel_old_timeval __user *, utimes) |
f1390358 DB |
205 | { |
206 | return do_futimesat(dfd, filename, utimes); | |
207 | } | |
208 | ||
003d7ab4 | 209 | SYSCALL_DEFINE2(utimes, char __user *, filename, |
75d319c0 | 210 | struct __kernel_old_timeval __user *, utimes) |
82b0547c | 211 | { |
f1390358 | 212 | return do_futimesat(AT_FDCWD, filename, utimes); |
82b0547c | 213 | } |
1a060ba3 | 214 | |
185cfaf7 AB |
215 | SYSCALL_DEFINE2(utime, char __user *, filename, struct utimbuf __user *, times) |
216 | { | |
217 | struct timespec64 tv[2]; | |
218 | ||
219 | if (times) { | |
220 | if (get_user(tv[0].tv_sec, ×->actime) || | |
221 | get_user(tv[1].tv_sec, ×->modtime)) | |
222 | return -EFAULT; | |
223 | tv[0].tv_nsec = 0; | |
224 | tv[1].tv_nsec = 0; | |
225 | } | |
226 | return do_utimes(AT_FDCWD, filename, times ? tv : NULL, 0); | |
227 | } | |
228 | #endif | |
229 | ||
4faea239 | 230 | #ifdef CONFIG_COMPAT_32BIT_TIME |
1a060ba3 AV |
231 | /* |
232 | * Not all architectures have sys_utime, so implement this in terms | |
233 | * of sys_utimes. | |
234 | */ | |
4faea239 | 235 | #ifdef __ARCH_WANT_SYS_UTIME32 |
8dabe724 AB |
236 | SYSCALL_DEFINE2(utime32, const char __user *, filename, |
237 | struct old_utimbuf32 __user *, t) | |
1a060ba3 | 238 | { |
aaed2dd8 | 239 | struct timespec64 tv[2]; |
1a060ba3 AV |
240 | |
241 | if (t) { | |
242 | if (get_user(tv[0].tv_sec, &t->actime) || | |
243 | get_user(tv[1].tv_sec, &t->modtime)) | |
244 | return -EFAULT; | |
245 | tv[0].tv_nsec = 0; | |
246 | tv[1].tv_nsec = 0; | |
247 | } | |
248 | return do_utimes(AT_FDCWD, filename, t ? tv : NULL, 0); | |
249 | } | |
4faea239 | 250 | #endif |
1a060ba3 | 251 | |
8dabe724 | 252 | SYSCALL_DEFINE4(utimensat_time32, unsigned int, dfd, const char __user *, filename, struct old_timespec32 __user *, t, int, flags) |
1a060ba3 | 253 | { |
aaed2dd8 | 254 | struct timespec64 tv[2]; |
1a060ba3 AV |
255 | |
256 | if (t) { | |
9afc5eee AB |
257 | if (get_old_timespec32(&tv[0], &t[0]) || |
258 | get_old_timespec32(&tv[1], &t[1])) | |
1a060ba3 AV |
259 | return -EFAULT; |
260 | ||
261 | if (tv[0].tv_nsec == UTIME_OMIT && tv[1].tv_nsec == UTIME_OMIT) | |
262 | return 0; | |
263 | } | |
264 | return do_utimes(dfd, filename, t ? tv : NULL, flags); | |
265 | } | |
266 | ||
4faea239 | 267 | #ifdef __ARCH_WANT_SYS_UTIME32 |
ab641afa | 268 | static long do_compat_futimesat(unsigned int dfd, const char __user *filename, |
9afc5eee | 269 | struct old_timeval32 __user *t) |
1a060ba3 | 270 | { |
aaed2dd8 | 271 | struct timespec64 tv[2]; |
1a060ba3 AV |
272 | |
273 | if (t) { | |
274 | if (get_user(tv[0].tv_sec, &t[0].tv_sec) || | |
275 | get_user(tv[0].tv_nsec, &t[0].tv_usec) || | |
276 | get_user(tv[1].tv_sec, &t[1].tv_sec) || | |
277 | get_user(tv[1].tv_nsec, &t[1].tv_usec)) | |
278 | return -EFAULT; | |
279 | if (tv[0].tv_nsec >= 1000000 || tv[0].tv_nsec < 0 || | |
280 | tv[1].tv_nsec >= 1000000 || tv[1].tv_nsec < 0) | |
281 | return -EINVAL; | |
282 | tv[0].tv_nsec *= 1000; | |
283 | tv[1].tv_nsec *= 1000; | |
284 | } | |
285 | return do_utimes(dfd, filename, t ? tv : NULL, 0); | |
286 | } | |
287 | ||
8dabe724 | 288 | SYSCALL_DEFINE3(futimesat_time32, unsigned int, dfd, |
ab641afa | 289 | const char __user *, filename, |
9afc5eee | 290 | struct old_timeval32 __user *, t) |
ab641afa DB |
291 | { |
292 | return do_compat_futimesat(dfd, filename, t); | |
293 | } | |
294 | ||
8dabe724 | 295 | SYSCALL_DEFINE2(utimes_time32, const char __user *, filename, struct old_timeval32 __user *, t) |
1a060ba3 | 296 | { |
ab641afa | 297 | return do_compat_futimesat(AT_FDCWD, filename, t); |
1a060ba3 AV |
298 | } |
299 | #endif | |
4faea239 | 300 | #endif |