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b2441318 | 1 | // SPDX-License-Identifier: GPL-2.0 |
1da177e4 LT |
2 | /* |
3 | * linux/fs/attr.c | |
4 | * | |
5 | * Copyright (C) 1991, 1992 Linus Torvalds | |
6 | * changes by Thomas Schoebel-Theuer | |
7 | */ | |
8 | ||
630d9c47 | 9 | #include <linux/export.h> |
1da177e4 LT |
10 | #include <linux/time.h> |
11 | #include <linux/mm.h> | |
12 | #include <linux/string.h> | |
3f07c014 | 13 | #include <linux/sched/signal.h> |
16f7e0fe | 14 | #include <linux/capability.h> |
0eeca283 | 15 | #include <linux/fsnotify.h> |
1da177e4 | 16 | #include <linux/fcntl.h> |
1da177e4 | 17 | #include <linux/security.h> |
975d2943 | 18 | #include <linux/evm.h> |
9957a504 | 19 | #include <linux/ima.h> |
1da177e4 | 20 | |
11c2a870 CB |
21 | #include "internal.h" |
22 | ||
72ae017c CB |
23 | /** |
24 | * setattr_should_drop_sgid - determine whether the setgid bit needs to be | |
25 | * removed | |
26 | * @mnt_userns: user namespace of the mount @inode was found from | |
27 | * @inode: inode to check | |
28 | * | |
29 | * This function determines whether the setgid bit needs to be removed. | |
30 | * We retain backwards compatibility and require setgid bit to be removed | |
31 | * unconditionally if S_IXGRP is set. Otherwise we have the exact same | |
32 | * requirements as setattr_prepare() and setattr_copy(). | |
33 | * | |
34 | * Return: ATTR_KILL_SGID if setgid bit needs to be removed, 0 otherwise. | |
35 | */ | |
36 | int setattr_should_drop_sgid(struct user_namespace *mnt_userns, | |
37 | const struct inode *inode) | |
38 | { | |
39 | umode_t mode = inode->i_mode; | |
40 | ||
41 | if (!(mode & S_ISGID)) | |
42 | return 0; | |
43 | if (mode & S_IXGRP) | |
44 | return ATTR_KILL_SGID; | |
45 | if (!in_group_or_capable(mnt_userns, inode, | |
46 | i_gid_into_vfsgid(mnt_userns, inode))) | |
47 | return ATTR_KILL_SGID; | |
48 | return 0; | |
49 | } | |
50 | ||
ed5a7047 CB |
51 | /** |
52 | * setattr_should_drop_suidgid - determine whether the set{g,u}id bit needs to | |
53 | * be dropped | |
54 | * @mnt_userns: user namespace of the mount @inode was found from | |
55 | * @inode: inode to check | |
e243e3f9 | 56 | * |
ed5a7047 CB |
57 | * This function determines whether the set{g,u}id bits need to be removed. |
58 | * If the setuid bit needs to be removed ATTR_KILL_SUID is returned. If the | |
59 | * setgid bit needs to be removed ATTR_KILL_SGID is returned. If both | |
60 | * set{g,u}id bits need to be removed the corresponding mask of both flags is | |
61 | * returned. | |
62 | * | |
63 | * Return: A mask of ATTR_KILL_S{G,U}ID indicating which - if any - setid bits | |
64 | * to remove, 0 otherwise. | |
e243e3f9 | 65 | */ |
ed5a7047 CB |
66 | int setattr_should_drop_suidgid(struct user_namespace *mnt_userns, |
67 | struct inode *inode) | |
e243e3f9 | 68 | { |
ed5a7047 | 69 | umode_t mode = inode->i_mode; |
e243e3f9 CB |
70 | int kill = 0; |
71 | ||
72 | /* suid always must be killed */ | |
73 | if (unlikely(mode & S_ISUID)) | |
74 | kill = ATTR_KILL_SUID; | |
75 | ||
ed5a7047 | 76 | kill |= setattr_should_drop_sgid(mnt_userns, inode); |
e243e3f9 CB |
77 | |
78 | if (unlikely(kill && !capable(CAP_FSETID) && S_ISREG(mode))) | |
79 | return kill; | |
80 | ||
81 | return 0; | |
82 | } | |
ed5a7047 | 83 | EXPORT_SYMBOL(setattr_should_drop_suidgid); |
e243e3f9 | 84 | |
2f221d6f CB |
85 | /** |
86 | * chown_ok - verify permissions to chown inode | |
87 | * @mnt_userns: user namespace of the mount @inode was found from | |
88 | * @inode: inode to check permissions on | |
81a1807d | 89 | * @ia_vfsuid: uid to chown @inode to |
2f221d6f CB |
90 | * |
91 | * If the inode has been found through an idmapped mount the user namespace of | |
92 | * the vfsmount must be passed through @mnt_userns. This function will then | |
93 | * take care to map the inode according to @mnt_userns before checking | |
94 | * permissions. On non-idmapped mounts or if permission checking is to be | |
95 | * performed on the raw inode simply passs init_user_ns. | |
96 | */ | |
97 | static bool chown_ok(struct user_namespace *mnt_userns, | |
b27c82e1 | 98 | const struct inode *inode, vfsuid_t ia_vfsuid) |
0031181c | 99 | { |
b27c82e1 CB |
100 | vfsuid_t vfsuid = i_uid_into_vfsuid(mnt_userns, inode); |
101 | if (vfsuid_eq_kuid(vfsuid, current_fsuid()) && | |
102 | vfsuid_eq(ia_vfsuid, vfsuid)) | |
0031181c | 103 | return true; |
2f221d6f | 104 | if (capable_wrt_inode_uidgid(mnt_userns, inode, CAP_CHOWN)) |
0031181c | 105 | return true; |
b27c82e1 | 106 | if (!vfsuid_valid(vfsuid) && |
0031181c EB |
107 | ns_capable(inode->i_sb->s_user_ns, CAP_CHOWN)) |
108 | return true; | |
109 | return false; | |
110 | } | |
111 | ||
2f221d6f CB |
112 | /** |
113 | * chgrp_ok - verify permissions to chgrp inode | |
114 | * @mnt_userns: user namespace of the mount @inode was found from | |
115 | * @inode: inode to check permissions on | |
81a1807d | 116 | * @ia_vfsgid: gid to chown @inode to |
2f221d6f CB |
117 | * |
118 | * If the inode has been found through an idmapped mount the user namespace of | |
119 | * the vfsmount must be passed through @mnt_userns. This function will then | |
120 | * take care to map the inode according to @mnt_userns before checking | |
121 | * permissions. On non-idmapped mounts or if permission checking is to be | |
122 | * performed on the raw inode simply passs init_user_ns. | |
123 | */ | |
124 | static bool chgrp_ok(struct user_namespace *mnt_userns, | |
b27c82e1 | 125 | const struct inode *inode, vfsgid_t ia_vfsgid) |
0031181c | 126 | { |
b27c82e1 CB |
127 | vfsgid_t vfsgid = i_gid_into_vfsgid(mnt_userns, inode); |
128 | vfsuid_t vfsuid = i_uid_into_vfsuid(mnt_userns, inode); | |
129 | if (vfsuid_eq_kuid(vfsuid, current_fsuid())) { | |
130 | if (vfsgid_eq(ia_vfsgid, vfsgid)) | |
168f9128 | 131 | return true; |
b27c82e1 | 132 | if (vfsgid_in_group_p(ia_vfsgid)) |
168f9128 CB |
133 | return true; |
134 | } | |
2f221d6f | 135 | if (capable_wrt_inode_uidgid(mnt_userns, inode, CAP_CHOWN)) |
0031181c | 136 | return true; |
b27c82e1 | 137 | if (!vfsgid_valid(vfsgid) && |
0031181c EB |
138 | ns_capable(inode->i_sb->s_user_ns, CAP_CHOWN)) |
139 | return true; | |
140 | return false; | |
141 | } | |
142 | ||
2c27c65e | 143 | /** |
31051c85 | 144 | * setattr_prepare - check if attribute changes to a dentry are allowed |
c1632a0f | 145 | * @idmap: idmap of the mount the inode was found from |
31051c85 | 146 | * @dentry: dentry to check |
2c27c65e CH |
147 | * @attr: attributes to change |
148 | * | |
149 | * Check if we are allowed to change the attributes contained in @attr | |
31051c85 JK |
150 | * in the given dentry. This includes the normal unix access permission |
151 | * checks, as well as checks for rlimits and others. The function also clears | |
152 | * SGID bit from mode if user is not allowed to set it. Also file capabilities | |
153 | * and IMA extended attributes are cleared if ATTR_KILL_PRIV is set. | |
2c27c65e | 154 | * |
c1632a0f CB |
155 | * If the inode has been found through an idmapped mount the idmap of |
156 | * the vfsmount must be passed through @idmap. This function will then | |
157 | * take care to map the inode according to @idmap before checking | |
2f221d6f | 158 | * permissions. On non-idmapped mounts or if permission checking is to be |
c1632a0f | 159 | * performed on the raw inode simply passs @nop_mnt_idmap. |
2f221d6f | 160 | * |
2c27c65e CH |
161 | * Should be called as the first thing in ->setattr implementations, |
162 | * possibly after taking additional locks. | |
163 | */ | |
c1632a0f | 164 | int setattr_prepare(struct mnt_idmap *idmap, struct dentry *dentry, |
2f221d6f | 165 | struct iattr *attr) |
1da177e4 | 166 | { |
c1632a0f | 167 | struct user_namespace *mnt_userns = mnt_idmap_owner(idmap); |
31051c85 | 168 | struct inode *inode = d_inode(dentry); |
1da177e4 LT |
169 | unsigned int ia_valid = attr->ia_valid; |
170 | ||
2c27c65e CH |
171 | /* |
172 | * First check size constraints. These can't be overriden using | |
173 | * ATTR_FORCE. | |
174 | */ | |
175 | if (ia_valid & ATTR_SIZE) { | |
176 | int error = inode_newsize_ok(inode, attr->ia_size); | |
177 | if (error) | |
178 | return error; | |
179 | } | |
180 | ||
1da177e4 LT |
181 | /* If force is set do it anyway. */ |
182 | if (ia_valid & ATTR_FORCE) | |
030b533c | 183 | goto kill_priv; |
1da177e4 LT |
184 | |
185 | /* Make sure a caller can chown. */ | |
b27c82e1 CB |
186 | if ((ia_valid & ATTR_UID) && |
187 | !chown_ok(mnt_userns, inode, attr->ia_vfsuid)) | |
2c27c65e | 188 | return -EPERM; |
1da177e4 LT |
189 | |
190 | /* Make sure caller can chgrp. */ | |
b27c82e1 CB |
191 | if ((ia_valid & ATTR_GID) && |
192 | !chgrp_ok(mnt_userns, inode, attr->ia_vfsgid)) | |
2c27c65e | 193 | return -EPERM; |
1da177e4 LT |
194 | |
195 | /* Make sure a caller can chmod. */ | |
196 | if (ia_valid & ATTR_MODE) { | |
b27c82e1 | 197 | vfsgid_t vfsgid; |
168f9128 | 198 | |
2f221d6f | 199 | if (!inode_owner_or_capable(mnt_userns, inode)) |
2c27c65e | 200 | return -EPERM; |
168f9128 CB |
201 | |
202 | if (ia_valid & ATTR_GID) | |
b27c82e1 | 203 | vfsgid = attr->ia_vfsgid; |
168f9128 | 204 | else |
b27c82e1 | 205 | vfsgid = i_gid_into_vfsgid(mnt_userns, inode); |
168f9128 | 206 | |
1da177e4 | 207 | /* Also check the setgid bit! */ |
11c2a870 | 208 | if (!in_group_or_capable(mnt_userns, inode, vfsgid)) |
1da177e4 LT |
209 | attr->ia_mode &= ~S_ISGID; |
210 | } | |
211 | ||
212 | /* Check for setting the inode time. */ | |
9767d749 | 213 | if (ia_valid & (ATTR_MTIME_SET | ATTR_ATIME_SET | ATTR_TIMES_SET)) { |
2f221d6f | 214 | if (!inode_owner_or_capable(mnt_userns, inode)) |
2c27c65e | 215 | return -EPERM; |
1da177e4 | 216 | } |
2c27c65e | 217 | |
030b533c JK |
218 | kill_priv: |
219 | /* User has permission for the change */ | |
220 | if (ia_valid & ATTR_KILL_PRIV) { | |
221 | int error; | |
222 | ||
71bc356f | 223 | error = security_inode_killpriv(mnt_userns, dentry); |
030b533c JK |
224 | if (error) |
225 | return error; | |
226 | } | |
227 | ||
2c27c65e | 228 | return 0; |
1da177e4 | 229 | } |
31051c85 | 230 | EXPORT_SYMBOL(setattr_prepare); |
1da177e4 | 231 | |
25d9e2d1 | 232 | /** |
233 | * inode_newsize_ok - may this inode be truncated to a given size | |
234 | * @inode: the inode to be truncated | |
235 | * @offset: the new size to assign to the inode | |
25d9e2d1 | 236 | * |
7bb46a67 | 237 | * inode_newsize_ok must be called with i_mutex held. |
238 | * | |
25d9e2d1 | 239 | * inode_newsize_ok will check filesystem limits and ulimits to check that the |
240 | * new inode size is within limits. inode_newsize_ok will also send SIGXFSZ | |
241 | * when necessary. Caller must not proceed with inode size change if failure is | |
242 | * returned. @inode must be a file (not directory), with appropriate | |
243 | * permissions to allow truncate (inode_newsize_ok does NOT check these | |
244 | * conditions). | |
3fae1746 MW |
245 | * |
246 | * Return: 0 on success, -ve errno on failure | |
25d9e2d1 | 247 | */ |
248 | int inode_newsize_ok(const struct inode *inode, loff_t offset) | |
249 | { | |
e2ebff9c DH |
250 | if (offset < 0) |
251 | return -EINVAL; | |
25d9e2d1 | 252 | if (inode->i_size < offset) { |
253 | unsigned long limit; | |
254 | ||
d554ed89 | 255 | limit = rlimit(RLIMIT_FSIZE); |
25d9e2d1 | 256 | if (limit != RLIM_INFINITY && offset > limit) |
257 | goto out_sig; | |
258 | if (offset > inode->i_sb->s_maxbytes) | |
259 | goto out_big; | |
260 | } else { | |
261 | /* | |
262 | * truncation of in-use swapfiles is disallowed - it would | |
263 | * cause subsequent swapout to scribble on the now-freed | |
264 | * blocks. | |
265 | */ | |
266 | if (IS_SWAPFILE(inode)) | |
267 | return -ETXTBSY; | |
268 | } | |
269 | ||
270 | return 0; | |
271 | out_sig: | |
272 | send_sig(SIGXFSZ, current, 0); | |
273 | out_big: | |
274 | return -EFBIG; | |
275 | } | |
276 | EXPORT_SYMBOL(inode_newsize_ok); | |
277 | ||
7bb46a67 | 278 | /** |
6a1a90ad | 279 | * setattr_copy - copy simple metadata updates into the generic inode |
c1632a0f | 280 | * @idmap: idmap of the mount the inode was found from |
7bb46a67 | 281 | * @inode: the inode to be updated |
282 | * @attr: the new attributes | |
283 | * | |
6a1a90ad | 284 | * setattr_copy must be called with i_mutex held. |
7bb46a67 | 285 | * |
6a1a90ad | 286 | * setattr_copy updates the inode's metadata with that specified |
b27c82e1 | 287 | * in attr on idmapped mounts. Necessary permission checks to determine |
2f221d6f CB |
288 | * whether or not the S_ISGID property needs to be removed are performed with |
289 | * the correct idmapped mount permission helpers. | |
290 | * Noticeably missing is inode size update, which is more complex | |
2c27c65e | 291 | * as it requires pagecache updates. |
7bb46a67 | 292 | * |
c1632a0f CB |
293 | * If the inode has been found through an idmapped mount the idmap of |
294 | * the vfsmount must be passed through @idmap. This function will then | |
295 | * take care to map the inode according to @idmap before checking | |
2f221d6f | 296 | * permissions. On non-idmapped mounts or if permission checking is to be |
c1632a0f | 297 | * performed on the raw inode simply pass @nop_mnt_idmap. |
2f221d6f | 298 | * |
7bb46a67 | 299 | * The inode is not marked as dirty after this operation. The rationale is |
300 | * that for "simple" filesystems, the struct inode is the inode storage. | |
301 | * The caller is free to mark the inode dirty afterwards if needed. | |
302 | */ | |
c1632a0f | 303 | void setattr_copy(struct mnt_idmap *idmap, struct inode *inode, |
2f221d6f | 304 | const struct iattr *attr) |
1da177e4 | 305 | { |
c1632a0f | 306 | struct user_namespace *mnt_userns = mnt_idmap_owner(idmap); |
1da177e4 | 307 | unsigned int ia_valid = attr->ia_valid; |
4a30131e | 308 | |
b27c82e1 CB |
309 | i_uid_update(mnt_userns, attr, inode); |
310 | i_gid_update(mnt_userns, attr, inode); | |
eb31e2f6 AG |
311 | if (ia_valid & ATTR_ATIME) |
312 | inode->i_atime = attr->ia_atime; | |
313 | if (ia_valid & ATTR_MTIME) | |
314 | inode->i_mtime = attr->ia_mtime; | |
315 | if (ia_valid & ATTR_CTIME) | |
316 | inode->i_ctime = attr->ia_ctime; | |
1da177e4 LT |
317 | if (ia_valid & ATTR_MODE) { |
318 | umode_t mode = attr->ia_mode; | |
11c2a870 CB |
319 | if (!in_group_or_capable(mnt_userns, inode, |
320 | i_gid_into_vfsgid(mnt_userns, inode))) | |
1da177e4 LT |
321 | mode &= ~S_ISGID; |
322 | inode->i_mode = mode; | |
323 | } | |
7bb46a67 | 324 | } |
6a1a90ad | 325 | EXPORT_SYMBOL(setattr_copy); |
7bb46a67 | 326 | |
4609e1f1 | 327 | int may_setattr(struct mnt_idmap *idmap, struct inode *inode, |
7bb698f0 AG |
328 | unsigned int ia_valid) |
329 | { | |
330 | int error; | |
4609e1f1 | 331 | struct user_namespace *mnt_userns = mnt_idmap_owner(idmap); |
7bb698f0 AG |
332 | |
333 | if (ia_valid & (ATTR_MODE | ATTR_UID | ATTR_GID | ATTR_TIMES_SET)) { | |
334 | if (IS_IMMUTABLE(inode) || IS_APPEND(inode)) | |
335 | return -EPERM; | |
336 | } | |
337 | ||
338 | /* | |
339 | * If utimes(2) and friends are called with times == NULL (or both | |
340 | * times are UTIME_NOW), then we need to check for write permission | |
341 | */ | |
342 | if (ia_valid & ATTR_TOUCH) { | |
343 | if (IS_IMMUTABLE(inode)) | |
344 | return -EPERM; | |
345 | ||
346 | if (!inode_owner_or_capable(mnt_userns, inode)) { | |
4609e1f1 | 347 | error = inode_permission(idmap, inode, MAY_WRITE); |
7bb698f0 AG |
348 | if (error) |
349 | return error; | |
350 | } | |
351 | } | |
352 | return 0; | |
353 | } | |
354 | EXPORT_SYMBOL(may_setattr); | |
355 | ||
27ac0ffe BF |
356 | /** |
357 | * notify_change - modify attributes of a filesytem object | |
abf08576 | 358 | * @idmap: idmap of the mount the inode was found from |
27ac0ffe | 359 | * @dentry: object affected |
3fae1746 | 360 | * @attr: new attributes |
27ac0ffe BF |
361 | * @delegated_inode: returns inode, if the inode is delegated |
362 | * | |
363 | * The caller must hold the i_mutex on the affected object. | |
364 | * | |
365 | * If notify_change discovers a delegation in need of breaking, | |
366 | * it will return -EWOULDBLOCK and return a reference to the inode in | |
367 | * delegated_inode. The caller should then break the delegation and | |
368 | * retry. Because breaking a delegation may take a long time, the | |
369 | * caller should drop the i_mutex before doing so. | |
370 | * | |
371 | * Alternatively, a caller may pass NULL for delegated_inode. This may | |
372 | * be appropriate for callers that expect the underlying filesystem not | |
373 | * to be NFS exported. Also, passing NULL is fine for callers holding | |
374 | * the file open for write, as there can be no conflicting delegation in | |
375 | * that case. | |
2f221d6f | 376 | * |
abf08576 CB |
377 | * If the inode has been found through an idmapped mount the idmap of |
378 | * the vfsmount must be passed through @idmap. This function will then | |
379 | * take care to map the inode according to @idmap before checking | |
2f221d6f | 380 | * permissions. On non-idmapped mounts or if permission checking is to be |
abf08576 | 381 | * performed on the raw inode simply pass @nop_mnt_idmap. |
27ac0ffe | 382 | */ |
abf08576 | 383 | int notify_change(struct mnt_idmap *idmap, struct dentry *dentry, |
2f221d6f | 384 | struct iattr *attr, struct inode **delegated_inode) |
1da177e4 | 385 | { |
abf08576 | 386 | struct user_namespace *mnt_userns = mnt_idmap_owner(idmap); |
1da177e4 | 387 | struct inode *inode = dentry->d_inode; |
8d334acd | 388 | umode_t mode = inode->i_mode; |
1da177e4 | 389 | int error; |
95582b00 | 390 | struct timespec64 now; |
1da177e4 LT |
391 | unsigned int ia_valid = attr->ia_valid; |
392 | ||
5955102c | 393 | WARN_ON_ONCE(!inode_is_locked(inode)); |
c4107b30 | 394 | |
4609e1f1 | 395 | error = may_setattr(idmap, inode, ia_valid); |
7bb698f0 AG |
396 | if (error) |
397 | return error; | |
f2b20f6e | 398 | |
69b45732 | 399 | if ((ia_valid & ATTR_MODE)) { |
8d334acd | 400 | umode_t amode = attr->ia_mode; |
69b45732 AK |
401 | /* Flag setting protected by i_mutex */ |
402 | if (is_sxid(amode)) | |
403 | inode->i_flags &= ~S_NOSEC; | |
404 | } | |
405 | ||
c2050a45 | 406 | now = current_time(inode); |
1da177e4 LT |
407 | |
408 | attr->ia_ctime = now; | |
409 | if (!(ia_valid & ATTR_ATIME_SET)) | |
410 | attr->ia_atime = now; | |
eb31e2f6 AG |
411 | else |
412 | attr->ia_atime = timestamp_truncate(attr->ia_atime, inode); | |
1da177e4 LT |
413 | if (!(ia_valid & ATTR_MTIME_SET)) |
414 | attr->ia_mtime = now; | |
eb31e2f6 AG |
415 | else |
416 | attr->ia_mtime = timestamp_truncate(attr->ia_mtime, inode); | |
417 | ||
b5376771 | 418 | if (ia_valid & ATTR_KILL_PRIV) { |
b5376771 | 419 | error = security_inode_need_killpriv(dentry); |
030b533c | 420 | if (error < 0) |
b5376771 | 421 | return error; |
030b533c JK |
422 | if (error == 0) |
423 | ia_valid = attr->ia_valid &= ~ATTR_KILL_PRIV; | |
b5376771 | 424 | } |
6de0ec00 JL |
425 | |
426 | /* | |
427 | * We now pass ATTR_KILL_S*ID to the lower level setattr function so | |
428 | * that the function has the ability to reinterpret a mode change | |
429 | * that's due to these bits. This adds an implicit restriction that | |
430 | * no function will ever call notify_change with both ATTR_MODE and | |
431 | * ATTR_KILL_S*ID set. | |
432 | */ | |
433 | if ((ia_valid & (ATTR_KILL_SUID|ATTR_KILL_SGID)) && | |
434 | (ia_valid & ATTR_MODE)) | |
435 | BUG(); | |
436 | ||
1da177e4 | 437 | if (ia_valid & ATTR_KILL_SUID) { |
1da177e4 | 438 | if (mode & S_ISUID) { |
6de0ec00 JL |
439 | ia_valid = attr->ia_valid |= ATTR_MODE; |
440 | attr->ia_mode = (inode->i_mode & ~S_ISUID); | |
1da177e4 LT |
441 | } |
442 | } | |
443 | if (ia_valid & ATTR_KILL_SGID) { | |
ed5a7047 | 444 | if (mode & S_ISGID) { |
1da177e4 LT |
445 | if (!(ia_valid & ATTR_MODE)) { |
446 | ia_valid = attr->ia_valid |= ATTR_MODE; | |
447 | attr->ia_mode = inode->i_mode; | |
448 | } | |
449 | attr->ia_mode &= ~S_ISGID; | |
450 | } | |
451 | } | |
6de0ec00 | 452 | if (!(attr->ia_valid & ~(ATTR_KILL_SUID | ATTR_KILL_SGID))) |
1da177e4 LT |
453 | return 0; |
454 | ||
a475acf0 SF |
455 | /* |
456 | * Verify that uid/gid changes are valid in the target | |
457 | * namespace of the superblock. | |
458 | */ | |
459 | if (ia_valid & ATTR_UID && | |
b27c82e1 CB |
460 | !vfsuid_has_fsmapping(mnt_userns, inode->i_sb->s_user_ns, |
461 | attr->ia_vfsuid)) | |
a475acf0 SF |
462 | return -EOVERFLOW; |
463 | if (ia_valid & ATTR_GID && | |
b27c82e1 CB |
464 | !vfsgid_has_fsmapping(mnt_userns, inode->i_sb->s_user_ns, |
465 | attr->ia_vfsgid)) | |
a475acf0 SF |
466 | return -EOVERFLOW; |
467 | ||
0bd23d09 EB |
468 | /* Don't allow modifications of files with invalid uids or |
469 | * gids unless those uids & gids are being made valid. | |
470 | */ | |
2f221d6f | 471 | if (!(ia_valid & ATTR_UID) && |
b27c82e1 | 472 | !vfsuid_valid(i_uid_into_vfsuid(mnt_userns, inode))) |
0bd23d09 | 473 | return -EOVERFLOW; |
2f221d6f | 474 | if (!(ia_valid & ATTR_GID) && |
b27c82e1 | 475 | !vfsgid_valid(i_gid_into_vfsgid(mnt_userns, inode))) |
0bd23d09 EB |
476 | return -EOVERFLOW; |
477 | ||
c1632a0f | 478 | error = security_inode_setattr(idmap, dentry, attr); |
27ac0ffe BF |
479 | if (error) |
480 | return error; | |
481 | error = try_break_deleg(inode, delegated_inode); | |
a77b72da MS |
482 | if (error) |
483 | return error; | |
484 | ||
eef2380c | 485 | if (inode->i_op->setattr) |
c1632a0f | 486 | error = inode->i_op->setattr(idmap, dentry, attr); |
eef2380c | 487 | else |
c1632a0f | 488 | error = simple_setattr(idmap, dentry, attr); |
1da177e4 | 489 | |
975d2943 | 490 | if (!error) { |
0eeca283 | 491 | fsnotify_change(dentry, ia_valid); |
a2d2329e | 492 | ima_inode_post_setattr(mnt_userns, dentry); |
975d2943 MZ |
493 | evm_inode_post_setattr(dentry, ia_valid); |
494 | } | |
0eeca283 | 495 | |
1da177e4 LT |
496 | return error; |
497 | } | |
1da177e4 | 498 | EXPORT_SYMBOL(notify_change); |