1 // SPDX-License-Identifier: GPL-2.0 1 // SPDX-License-Identifier: GPL-2.0
2 /* 2 /*
3 * linux/fs/stat.c 3 * linux/fs/stat.c
4 * 4 *
5 * Copyright (C) 1991, 1992 Linus Torvalds 5 * Copyright (C) 1991, 1992 Linus Torvalds
6 */ 6 */
7 7
8 #include <linux/blkdev.h> <<
9 #include <linux/export.h> 8 #include <linux/export.h>
10 #include <linux/mm.h> 9 #include <linux/mm.h>
11 #include <linux/errno.h> 10 #include <linux/errno.h>
12 #include <linux/file.h> 11 #include <linux/file.h>
13 #include <linux/highuid.h> 12 #include <linux/highuid.h>
14 #include <linux/fs.h> 13 #include <linux/fs.h>
15 #include <linux/namei.h> 14 #include <linux/namei.h>
16 #include <linux/security.h> 15 #include <linux/security.h>
17 #include <linux/cred.h> 16 #include <linux/cred.h>
18 #include <linux/syscalls.h> 17 #include <linux/syscalls.h>
19 #include <linux/pagemap.h> 18 #include <linux/pagemap.h>
20 #include <linux/compat.h> 19 #include <linux/compat.h>
21 #include <linux/iversion.h> <<
22 20
23 #include <linux/uaccess.h> 21 #include <linux/uaccess.h>
24 #include <asm/unistd.h> 22 #include <asm/unistd.h>
25 23
26 #include "internal.h" <<
27 #include "mount.h" <<
28 <<
29 /** 24 /**
30 * generic_fillattr - Fill in the basic attrib 25 * generic_fillattr - Fill in the basic attributes from the inode struct
31 * @idmap: idmap of the mount the !! 26 * @inode: Inode to use as the source
32 * @request_mask: statx request_mask !! 27 * @stat: Where to fill in the attributes
33 * @inode: Inode to use as the so <<
34 * @stat: Where to fill in the a <<
35 * 28 *
36 * Fill in the basic attributes in the kstat s 29 * Fill in the basic attributes in the kstat structure from data that's to be
37 * found on the VFS inode structure. This is 30 * found on the VFS inode structure. This is the default if no getattr inode
38 * operation is supplied. 31 * operation is supplied.
39 * <<
40 * If the inode has been found through an idma <<
41 * the vfsmount must be passed through @idmap. <<
42 * take care to map the inode according to @id <<
43 * uid and gid filds. On non-idmapped mounts o <<
44 * performed on the raw inode simply pass @nop <<
45 */ 32 */
46 void generic_fillattr(struct mnt_idmap *idmap, !! 33 void generic_fillattr(struct inode *inode, struct kstat *stat)
47 struct inode *inode, str <<
48 { 34 {
49 vfsuid_t vfsuid = i_uid_into_vfsuid(id <<
50 vfsgid_t vfsgid = i_gid_into_vfsgid(id <<
51 <<
52 stat->dev = inode->i_sb->s_dev; 35 stat->dev = inode->i_sb->s_dev;
53 stat->ino = inode->i_ino; 36 stat->ino = inode->i_ino;
54 stat->mode = inode->i_mode; 37 stat->mode = inode->i_mode;
55 stat->nlink = inode->i_nlink; 38 stat->nlink = inode->i_nlink;
56 stat->uid = vfsuid_into_kuid(vfsuid); !! 39 stat->uid = inode->i_uid;
57 stat->gid = vfsgid_into_kgid(vfsgid); !! 40 stat->gid = inode->i_gid;
58 stat->rdev = inode->i_rdev; 41 stat->rdev = inode->i_rdev;
59 stat->size = i_size_read(inode); 42 stat->size = i_size_read(inode);
60 stat->atime = inode_get_atime(inode); !! 43 stat->atime = inode->i_atime;
61 stat->mtime = inode_get_mtime(inode); !! 44 stat->mtime = inode->i_mtime;
62 stat->ctime = inode_get_ctime(inode); !! 45 stat->ctime = inode->i_ctime;
63 stat->blksize = i_blocksize(inode); 46 stat->blksize = i_blocksize(inode);
64 stat->blocks = inode->i_blocks; 47 stat->blocks = inode->i_blocks;
65 <<
66 if ((request_mask & STATX_CHANGE_COOKI <<
67 stat->result_mask |= STATX_CHA <<
68 stat->change_cookie = inode_qu <<
69 } <<
70 <<
71 } 48 }
72 EXPORT_SYMBOL(generic_fillattr); 49 EXPORT_SYMBOL(generic_fillattr);
73 50
74 /** 51 /**
75 * generic_fill_statx_attr - Fill in the statx <<
76 * @inode: Inode to use as the source <<
77 * @stat: Where to fill in the attribute <<
78 * <<
79 * Fill in the STATX_ATTR_* flags in the kstat <<
80 * inode that are published on i_flags and enf <<
81 */ <<
82 void generic_fill_statx_attr(struct inode *ino <<
83 { <<
84 if (inode->i_flags & S_IMMUTABLE) <<
85 stat->attributes |= STATX_ATTR <<
86 if (inode->i_flags & S_APPEND) <<
87 stat->attributes |= STATX_ATTR <<
88 stat->attributes_mask |= KSTAT_ATTR_VF <<
89 } <<
90 EXPORT_SYMBOL(generic_fill_statx_attr); <<
91 <<
92 /** <<
93 * generic_fill_statx_atomic_writes - Fill in <<
94 * @stat: Where to fill in the attribute <<
95 * @unit_min: Minimum supported atomic write <<
96 * @unit_max: Maximum supported atomic write <<
97 * <<
98 * Fill in the STATX{_ATTR}_WRITE_ATOMIC flags <<
99 * atomic write unit_min and unit_max values. <<
100 */ <<
101 void generic_fill_statx_atomic_writes(struct k <<
102 unsigned <<
103 unsigned <<
104 { <<
105 /* Confirm that the request type is kn <<
106 stat->result_mask |= STATX_WRITE_ATOMI <<
107 <<
108 /* Confirm that the file attribute typ <<
109 stat->attributes_mask |= STATX_ATTR_WR <<
110 <<
111 if (unit_min) { <<
112 stat->atomic_write_unit_min = <<
113 stat->atomic_write_unit_max = <<
114 /* Initially only allow 1x seg <<
115 stat->atomic_write_segments_ma <<
116 <<
117 /* Confirm atomic writes are a <<
118 stat->attributes |= STATX_ATTR <<
119 } <<
120 } <<
121 EXPORT_SYMBOL_GPL(generic_fill_statx_atomic_wr <<
122 <<
123 /** <<
124 * vfs_getattr_nosec - getattr without securit 52 * vfs_getattr_nosec - getattr without security checks
125 * @path: file to get attributes from 53 * @path: file to get attributes from
126 * @stat: structure to return attributes in 54 * @stat: structure to return attributes in
127 * @request_mask: STATX_xxx flags indicating w 55 * @request_mask: STATX_xxx flags indicating what the caller wants
128 * @query_flags: Query mode (AT_STATX_SYNC_TYP !! 56 * @query_flags: Query mode (KSTAT_QUERY_FLAGS)
129 * 57 *
130 * Get attributes without calling security_ino 58 * Get attributes without calling security_inode_getattr.
131 * 59 *
132 * Currently the only caller other than vfs_ge 60 * Currently the only caller other than vfs_getattr is internal to the
133 * filehandle lookup code, which uses only the 61 * filehandle lookup code, which uses only the inode number and returns no
134 * attributes to any user. Any other code pro 62 * attributes to any user. Any other code probably wants vfs_getattr.
135 */ 63 */
136 int vfs_getattr_nosec(const struct path *path, 64 int vfs_getattr_nosec(const struct path *path, struct kstat *stat,
137 u32 request_mask, unsign 65 u32 request_mask, unsigned int query_flags)
138 { 66 {
139 struct mnt_idmap *idmap; <<
140 struct inode *inode = d_backing_inode( 67 struct inode *inode = d_backing_inode(path->dentry);
141 68
142 memset(stat, 0, sizeof(*stat)); 69 memset(stat, 0, sizeof(*stat));
143 stat->result_mask |= STATX_BASIC_STATS 70 stat->result_mask |= STATX_BASIC_STATS;
144 query_flags &= AT_STATX_SYNC_TYPE; !! 71 request_mask &= STATX_ALL;
>> 72 query_flags &= KSTAT_QUERY_FLAGS;
145 73
146 /* allow the fs to override these if i 74 /* allow the fs to override these if it really wants to */
147 /* SB_NOATIME means filesystem supplie !! 75 if (IS_NOATIME(inode))
148 if (inode->i_sb->s_flags & SB_NOATIME) <<
149 stat->result_mask &= ~STATX_AT 76 stat->result_mask &= ~STATX_ATIME;
150 <<
151 /* <<
152 * Note: If you add another clause to <<
153 * update attributes_mask below. <<
154 */ <<
155 if (IS_AUTOMOUNT(inode)) 77 if (IS_AUTOMOUNT(inode))
156 stat->attributes |= STATX_ATTR 78 stat->attributes |= STATX_ATTR_AUTOMOUNT;
157 79
158 if (IS_DAX(inode)) <<
159 stat->attributes |= STATX_ATTR <<
160 <<
161 stat->attributes_mask |= (STATX_ATTR_A <<
162 STATX_ATTR_D <<
163 <<
164 idmap = mnt_idmap(path->mnt); <<
165 if (inode->i_op->getattr) 80 if (inode->i_op->getattr)
166 return inode->i_op->getattr(id !! 81 return inode->i_op->getattr(path, stat, request_mask,
167 re !! 82 query_flags);
168 qu <<
169 83
170 generic_fillattr(idmap, request_mask, !! 84 generic_fillattr(inode, stat);
171 return 0; 85 return 0;
172 } 86 }
173 EXPORT_SYMBOL(vfs_getattr_nosec); 87 EXPORT_SYMBOL(vfs_getattr_nosec);
174 88
175 /* 89 /*
176 * vfs_getattr - Get the enhanced basic attrib 90 * vfs_getattr - Get the enhanced basic attributes of a file
177 * @path: The file of interest 91 * @path: The file of interest
178 * @stat: Where to return the statistics 92 * @stat: Where to return the statistics
179 * @request_mask: STATX_xxx flags indicating w 93 * @request_mask: STATX_xxx flags indicating what the caller wants
180 * @query_flags: Query mode (AT_STATX_SYNC_TYP !! 94 * @query_flags: Query mode (KSTAT_QUERY_FLAGS)
181 * 95 *
182 * Ask the filesystem for a file's attributes. 96 * Ask the filesystem for a file's attributes. The caller must indicate in
183 * request_mask and query_flags to indicate wh 97 * request_mask and query_flags to indicate what they want.
184 * 98 *
185 * If the file is remote, the filesystem can b 99 * If the file is remote, the filesystem can be forced to update the attributes
186 * from the backing store by passing AT_STATX_ 100 * from the backing store by passing AT_STATX_FORCE_SYNC in query_flags or can
187 * suppress the update by passing AT_STATX_DON 101 * suppress the update by passing AT_STATX_DONT_SYNC.
188 * 102 *
189 * Bits must have been set in request_mask to 103 * Bits must have been set in request_mask to indicate which attributes the
190 * caller wants retrieving. Any such attribut 104 * caller wants retrieving. Any such attribute not requested may be returned
191 * anyway, but the value may be approximate, a 105 * anyway, but the value may be approximate, and, if remote, may not have been
192 * synchronised with the server. 106 * synchronised with the server.
193 * 107 *
194 * 0 will be returned on success, and a -ve er 108 * 0 will be returned on success, and a -ve error code if unsuccessful.
195 */ 109 */
196 int vfs_getattr(const struct path *path, struc 110 int vfs_getattr(const struct path *path, struct kstat *stat,
197 u32 request_mask, unsigned int 111 u32 request_mask, unsigned int query_flags)
198 { 112 {
199 int retval; 113 int retval;
200 114
201 if (WARN_ON_ONCE(query_flags & AT_GETA <<
202 return -EPERM; <<
203 <<
204 retval = security_inode_getattr(path); 115 retval = security_inode_getattr(path);
205 if (retval) 116 if (retval)
206 return retval; 117 return retval;
207 return vfs_getattr_nosec(path, stat, r 118 return vfs_getattr_nosec(path, stat, request_mask, query_flags);
208 } 119 }
209 EXPORT_SYMBOL(vfs_getattr); 120 EXPORT_SYMBOL(vfs_getattr);
210 121
211 /** 122 /**
212 * vfs_fstat - Get the basic attributes by fil !! 123 * vfs_statx_fd - Get the enhanced basic attributes by file descriptor
213 * @fd: The file descriptor referring to the f 124 * @fd: The file descriptor referring to the file of interest
214 * @stat: The result structure to fill in. 125 * @stat: The result structure to fill in.
>> 126 * @request_mask: STATX_xxx flags indicating what the caller wants
>> 127 * @query_flags: Query mode (KSTAT_QUERY_FLAGS)
215 * 128 *
216 * This function is a wrapper around vfs_getat 129 * This function is a wrapper around vfs_getattr(). The main difference is
217 * that it uses a file descriptor to determine 130 * that it uses a file descriptor to determine the file location.
218 * 131 *
219 * 0 will be returned on success, and a -ve er 132 * 0 will be returned on success, and a -ve error code if unsuccessful.
220 */ 133 */
221 int vfs_fstat(int fd, struct kstat *stat) !! 134 int vfs_statx_fd(unsigned int fd, struct kstat *stat,
>> 135 u32 request_mask, unsigned int query_flags)
222 { 136 {
223 struct fd f; 137 struct fd f;
224 int error; !! 138 int error = -EBADF;
225 <<
226 f = fdget_raw(fd); <<
227 if (!f.file) <<
228 return -EBADF; <<
229 error = vfs_getattr(&f.file->f_path, s <<
230 fdput(f); <<
231 return error; <<
232 } <<
233 <<
234 int getname_statx_lookup_flags(int flags) <<
235 { <<
236 int lookup_flags = 0; <<
237 <<
238 if (!(flags & AT_SYMLINK_NOFOLLOW)) <<
239 lookup_flags |= LOOKUP_FOLLOW; <<
240 if (!(flags & AT_NO_AUTOMOUNT)) <<
241 lookup_flags |= LOOKUP_AUTOMOU <<
242 if (flags & AT_EMPTY_PATH) <<
243 lookup_flags |= LOOKUP_EMPTY; <<
244 139
245 return lookup_flags; !! 140 if (query_flags & ~KSTAT_QUERY_FLAGS)
246 } !! 141 return -EINVAL;
247 <<
248 static int vfs_statx_path(struct path *path, i <<
249 u32 request_mask) <<
250 { <<
251 int error = vfs_getattr(path, stat, re <<
252 142
253 if (request_mask & STATX_MNT_ID_UNIQUE !! 143 f = fdget_raw(fd);
254 stat->mnt_id = real_mount(path !! 144 if (f.file) {
255 stat->result_mask |= STATX_MNT !! 145 error = vfs_getattr(&f.file->f_path, stat,
256 } else { !! 146 request_mask, query_flags);
257 stat->mnt_id = real_mount(path !! 147 fdput(f);
258 stat->result_mask |= STATX_MNT <<
259 } 148 }
260 <<
261 if (path_mounted(path)) <<
262 stat->attributes |= STATX_ATTR <<
263 stat->attributes_mask |= STATX_ATTR_MO <<
264 <<
265 /* <<
266 * If this is a block device inode, ov <<
267 * attributes with the block device sp <<
268 * obtained from the bdev backing inod <<
269 */ <<
270 if (S_ISBLK(stat->mode)) <<
271 bdev_statx(path, stat, request <<
272 <<
273 return error; 149 return error;
274 } 150 }
275 !! 151 EXPORT_SYMBOL(vfs_statx_fd);
276 static int vfs_statx_fd(int fd, int flags, str <<
277 u32 request_mask) <<
278 { <<
279 CLASS(fd_raw, f)(fd); <<
280 if (!f.file) <<
281 return -EBADF; <<
282 return vfs_statx_path(&f.file->f_path, <<
283 } <<
284 152
285 /** 153 /**
286 * vfs_statx - Get basic and extra attributes 154 * vfs_statx - Get basic and extra attributes by filename
287 * @dfd: A file descriptor representing the ba 155 * @dfd: A file descriptor representing the base dir for a relative filename
288 * @filename: The name of the file of interest 156 * @filename: The name of the file of interest
289 * @flags: Flags to control the query 157 * @flags: Flags to control the query
290 * @stat: The result structure to fill in. 158 * @stat: The result structure to fill in.
291 * @request_mask: STATX_xxx flags indicating w 159 * @request_mask: STATX_xxx flags indicating what the caller wants
292 * 160 *
293 * This function is a wrapper around vfs_getat 161 * This function is a wrapper around vfs_getattr(). The main difference is
294 * that it uses a filename and base directory 162 * that it uses a filename and base directory to determine the file location.
295 * Additionally, the use of AT_SYMLINK_NOFOLLO 163 * Additionally, the use of AT_SYMLINK_NOFOLLOW in flags will prevent a symlink
296 * at the given name from being referenced. 164 * at the given name from being referenced.
297 * 165 *
298 * 0 will be returned on success, and a -ve er 166 * 0 will be returned on success, and a -ve error code if unsuccessful.
299 */ 167 */
300 static int vfs_statx(int dfd, struct filename !! 168 int vfs_statx(int dfd, const char __user *filename, int flags,
301 struct kstat *stat, u32 request_ 169 struct kstat *stat, u32 request_mask)
302 { 170 {
303 struct path path; 171 struct path path;
304 unsigned int lookup_flags = getname_st !! 172 int error = -EINVAL;
305 int error; !! 173 unsigned int lookup_flags = LOOKUP_FOLLOW | LOOKUP_AUTOMOUNT;
306 174
307 if (flags & ~(AT_SYMLINK_NOFOLLOW | AT !! 175 if ((flags & ~(AT_SYMLINK_NOFOLLOW | AT_NO_AUTOMOUNT |
308 AT_STATX_SYNC_TYPE)) !! 176 AT_EMPTY_PATH | KSTAT_QUERY_FLAGS)) != 0)
309 return -EINVAL; 177 return -EINVAL;
310 178
>> 179 if (flags & AT_SYMLINK_NOFOLLOW)
>> 180 lookup_flags &= ~LOOKUP_FOLLOW;
>> 181 if (flags & AT_NO_AUTOMOUNT)
>> 182 lookup_flags &= ~LOOKUP_AUTOMOUNT;
>> 183 if (flags & AT_EMPTY_PATH)
>> 184 lookup_flags |= LOOKUP_EMPTY;
>> 185
311 retry: 186 retry:
312 error = filename_lookup(dfd, filename, !! 187 error = user_path_at(dfd, filename, lookup_flags, &path);
313 if (error) 188 if (error)
314 return error; !! 189 goto out;
315 error = vfs_statx_path(&path, flags, s !! 190
>> 191 error = vfs_getattr(&path, stat, request_mask, flags);
316 path_put(&path); 192 path_put(&path);
317 if (retry_estale(error, lookup_flags)) 193 if (retry_estale(error, lookup_flags)) {
318 lookup_flags |= LOOKUP_REVAL; 194 lookup_flags |= LOOKUP_REVAL;
319 goto retry; 195 goto retry;
320 } 196 }
>> 197 out:
321 return error; 198 return error;
322 } 199 }
>> 200 EXPORT_SYMBOL(vfs_statx);
323 201
324 int vfs_fstatat(int dfd, const char __user *fi <<
325 struct kstat *st <<
326 { <<
327 int ret; <<
328 int statx_flags = flags | AT_NO_AUTOMO <<
329 struct filename *name; <<
330 <<
331 /* <<
332 * Work around glibc turning fstat() i <<
333 * <<
334 * If AT_EMPTY_PATH is set, we expect <<
335 * empty path, and avoid doing all the <<
336 */ <<
337 if (flags == AT_EMPTY_PATH && vfs_empt <<
338 return vfs_fstat(dfd, stat); <<
339 <<
340 name = getname_flags(filename, getname <<
341 ret = vfs_statx(dfd, name, statx_flags <<
342 putname(name); <<
343 <<
344 return ret; <<
345 } <<
346 202
347 #ifdef __ARCH_WANT_OLD_STAT 203 #ifdef __ARCH_WANT_OLD_STAT
348 204
349 /* 205 /*
350 * For backward compatibility? Maybe this sho 206 * For backward compatibility? Maybe this should be moved
351 * into arch/i386 instead? 207 * into arch/i386 instead?
352 */ 208 */
353 static int cp_old_stat(struct kstat *stat, str 209 static int cp_old_stat(struct kstat *stat, struct __old_kernel_stat __user * statbuf)
354 { 210 {
355 static int warncount = 5; 211 static int warncount = 5;
356 struct __old_kernel_stat tmp; 212 struct __old_kernel_stat tmp;
357 213
358 if (warncount > 0) { 214 if (warncount > 0) {
359 warncount--; 215 warncount--;
360 printk(KERN_WARNING "VFS: Warn 216 printk(KERN_WARNING "VFS: Warning: %s using old stat() call. Recompile your binary.\n",
361 current->comm); 217 current->comm);
362 } else if (warncount < 0) { 218 } else if (warncount < 0) {
363 /* it's laughable, but... */ 219 /* it's laughable, but... */
364 warncount = 0; 220 warncount = 0;
365 } 221 }
366 222
367 memset(&tmp, 0, sizeof(struct __old_ke 223 memset(&tmp, 0, sizeof(struct __old_kernel_stat));
368 tmp.st_dev = old_encode_dev(stat->dev) 224 tmp.st_dev = old_encode_dev(stat->dev);
369 tmp.st_ino = stat->ino; 225 tmp.st_ino = stat->ino;
370 if (sizeof(tmp.st_ino) < sizeof(stat-> 226 if (sizeof(tmp.st_ino) < sizeof(stat->ino) && tmp.st_ino != stat->ino)
371 return -EOVERFLOW; 227 return -EOVERFLOW;
372 tmp.st_mode = stat->mode; 228 tmp.st_mode = stat->mode;
373 tmp.st_nlink = stat->nlink; 229 tmp.st_nlink = stat->nlink;
374 if (tmp.st_nlink != stat->nlink) 230 if (tmp.st_nlink != stat->nlink)
375 return -EOVERFLOW; 231 return -EOVERFLOW;
376 SET_UID(tmp.st_uid, from_kuid_munged(c 232 SET_UID(tmp.st_uid, from_kuid_munged(current_user_ns(), stat->uid));
377 SET_GID(tmp.st_gid, from_kgid_munged(c 233 SET_GID(tmp.st_gid, from_kgid_munged(current_user_ns(), stat->gid));
378 tmp.st_rdev = old_encode_dev(stat->rde 234 tmp.st_rdev = old_encode_dev(stat->rdev);
379 #if BITS_PER_LONG == 32 235 #if BITS_PER_LONG == 32
380 if (stat->size > MAX_NON_LFS) 236 if (stat->size > MAX_NON_LFS)
381 return -EOVERFLOW; 237 return -EOVERFLOW;
382 #endif 238 #endif
383 tmp.st_size = stat->size; 239 tmp.st_size = stat->size;
384 tmp.st_atime = stat->atime.tv_sec; 240 tmp.st_atime = stat->atime.tv_sec;
385 tmp.st_mtime = stat->mtime.tv_sec; 241 tmp.st_mtime = stat->mtime.tv_sec;
386 tmp.st_ctime = stat->ctime.tv_sec; 242 tmp.st_ctime = stat->ctime.tv_sec;
387 return copy_to_user(statbuf,&tmp,sizeo 243 return copy_to_user(statbuf,&tmp,sizeof(tmp)) ? -EFAULT : 0;
388 } 244 }
389 245
390 SYSCALL_DEFINE2(stat, const char __user *, fil 246 SYSCALL_DEFINE2(stat, const char __user *, filename,
391 struct __old_kernel_stat __use 247 struct __old_kernel_stat __user *, statbuf)
392 { 248 {
393 struct kstat stat; 249 struct kstat stat;
394 int error; 250 int error;
395 251
396 error = vfs_stat(filename, &stat); 252 error = vfs_stat(filename, &stat);
397 if (error) 253 if (error)
398 return error; 254 return error;
399 255
400 return cp_old_stat(&stat, statbuf); 256 return cp_old_stat(&stat, statbuf);
401 } 257 }
402 258
403 SYSCALL_DEFINE2(lstat, const char __user *, fi 259 SYSCALL_DEFINE2(lstat, const char __user *, filename,
404 struct __old_kernel_stat __use 260 struct __old_kernel_stat __user *, statbuf)
405 { 261 {
406 struct kstat stat; 262 struct kstat stat;
407 int error; 263 int error;
408 264
409 error = vfs_lstat(filename, &stat); 265 error = vfs_lstat(filename, &stat);
410 if (error) 266 if (error)
411 return error; 267 return error;
412 268
413 return cp_old_stat(&stat, statbuf); 269 return cp_old_stat(&stat, statbuf);
414 } 270 }
415 271
416 SYSCALL_DEFINE2(fstat, unsigned int, fd, struc 272 SYSCALL_DEFINE2(fstat, unsigned int, fd, struct __old_kernel_stat __user *, statbuf)
417 { 273 {
418 struct kstat stat; 274 struct kstat stat;
419 int error = vfs_fstat(fd, &stat); 275 int error = vfs_fstat(fd, &stat);
420 276
421 if (!error) 277 if (!error)
422 error = cp_old_stat(&stat, sta 278 error = cp_old_stat(&stat, statbuf);
423 279
424 return error; 280 return error;
425 } 281 }
426 282
427 #endif /* __ARCH_WANT_OLD_STAT */ 283 #endif /* __ARCH_WANT_OLD_STAT */
428 284
429 #ifdef __ARCH_WANT_NEW_STAT 285 #ifdef __ARCH_WANT_NEW_STAT
430 286
>> 287 #if BITS_PER_LONG == 32
>> 288 # define choose_32_64(a,b) a
>> 289 #else
>> 290 # define choose_32_64(a,b) b
>> 291 #endif
>> 292
>> 293 #define valid_dev(x) choose_32_64(old_valid_dev(x),true)
>> 294 #define encode_dev(x) choose_32_64(old_encode_dev,new_encode_dev)(x)
>> 295
431 #ifndef INIT_STRUCT_STAT_PADDING 296 #ifndef INIT_STRUCT_STAT_PADDING
432 # define INIT_STRUCT_STAT_PADDING(st) memset( 297 # define INIT_STRUCT_STAT_PADDING(st) memset(&st, 0, sizeof(st))
433 #endif 298 #endif
434 299
435 static int cp_new_stat(struct kstat *stat, str 300 static int cp_new_stat(struct kstat *stat, struct stat __user *statbuf)
436 { 301 {
437 struct stat tmp; 302 struct stat tmp;
438 303
439 if (sizeof(tmp.st_dev) < 4 && !old_val !! 304 if (!valid_dev(stat->dev) || !valid_dev(stat->rdev))
440 return -EOVERFLOW; <<
441 if (sizeof(tmp.st_rdev) < 4 && !old_va <<
442 return -EOVERFLOW; 305 return -EOVERFLOW;
443 #if BITS_PER_LONG == 32 306 #if BITS_PER_LONG == 32
444 if (stat->size > MAX_NON_LFS) 307 if (stat->size > MAX_NON_LFS)
445 return -EOVERFLOW; 308 return -EOVERFLOW;
446 #endif 309 #endif
447 310
448 INIT_STRUCT_STAT_PADDING(tmp); 311 INIT_STRUCT_STAT_PADDING(tmp);
449 tmp.st_dev = new_encode_dev(stat->dev) !! 312 tmp.st_dev = encode_dev(stat->dev);
450 tmp.st_ino = stat->ino; 313 tmp.st_ino = stat->ino;
451 if (sizeof(tmp.st_ino) < sizeof(stat-> 314 if (sizeof(tmp.st_ino) < sizeof(stat->ino) && tmp.st_ino != stat->ino)
452 return -EOVERFLOW; 315 return -EOVERFLOW;
453 tmp.st_mode = stat->mode; 316 tmp.st_mode = stat->mode;
454 tmp.st_nlink = stat->nlink; 317 tmp.st_nlink = stat->nlink;
455 if (tmp.st_nlink != stat->nlink) 318 if (tmp.st_nlink != stat->nlink)
456 return -EOVERFLOW; 319 return -EOVERFLOW;
457 SET_UID(tmp.st_uid, from_kuid_munged(c 320 SET_UID(tmp.st_uid, from_kuid_munged(current_user_ns(), stat->uid));
458 SET_GID(tmp.st_gid, from_kgid_munged(c 321 SET_GID(tmp.st_gid, from_kgid_munged(current_user_ns(), stat->gid));
459 tmp.st_rdev = new_encode_dev(stat->rde !! 322 tmp.st_rdev = encode_dev(stat->rdev);
460 tmp.st_size = stat->size; 323 tmp.st_size = stat->size;
461 tmp.st_atime = stat->atime.tv_sec; 324 tmp.st_atime = stat->atime.tv_sec;
462 tmp.st_mtime = stat->mtime.tv_sec; 325 tmp.st_mtime = stat->mtime.tv_sec;
463 tmp.st_ctime = stat->ctime.tv_sec; 326 tmp.st_ctime = stat->ctime.tv_sec;
464 #ifdef STAT_HAVE_NSEC 327 #ifdef STAT_HAVE_NSEC
465 tmp.st_atime_nsec = stat->atime.tv_nse 328 tmp.st_atime_nsec = stat->atime.tv_nsec;
466 tmp.st_mtime_nsec = stat->mtime.tv_nse 329 tmp.st_mtime_nsec = stat->mtime.tv_nsec;
467 tmp.st_ctime_nsec = stat->ctime.tv_nse 330 tmp.st_ctime_nsec = stat->ctime.tv_nsec;
468 #endif 331 #endif
469 tmp.st_blocks = stat->blocks; 332 tmp.st_blocks = stat->blocks;
470 tmp.st_blksize = stat->blksize; 333 tmp.st_blksize = stat->blksize;
471 return copy_to_user(statbuf,&tmp,sizeo 334 return copy_to_user(statbuf,&tmp,sizeof(tmp)) ? -EFAULT : 0;
472 } 335 }
473 336
474 SYSCALL_DEFINE2(newstat, const char __user *, 337 SYSCALL_DEFINE2(newstat, const char __user *, filename,
475 struct stat __user *, statbuf) 338 struct stat __user *, statbuf)
476 { 339 {
477 struct kstat stat; 340 struct kstat stat;
478 int error = vfs_stat(filename, &stat); 341 int error = vfs_stat(filename, &stat);
479 342
480 if (error) 343 if (error)
481 return error; 344 return error;
482 return cp_new_stat(&stat, statbuf); 345 return cp_new_stat(&stat, statbuf);
483 } 346 }
484 347
485 SYSCALL_DEFINE2(newlstat, const char __user *, 348 SYSCALL_DEFINE2(newlstat, const char __user *, filename,
486 struct stat __user *, statbuf) 349 struct stat __user *, statbuf)
487 { 350 {
488 struct kstat stat; 351 struct kstat stat;
489 int error; 352 int error;
490 353
491 error = vfs_lstat(filename, &stat); 354 error = vfs_lstat(filename, &stat);
492 if (error) 355 if (error)
493 return error; 356 return error;
494 357
495 return cp_new_stat(&stat, statbuf); 358 return cp_new_stat(&stat, statbuf);
496 } 359 }
497 360
498 #if !defined(__ARCH_WANT_STAT64) || defined(__ 361 #if !defined(__ARCH_WANT_STAT64) || defined(__ARCH_WANT_SYS_NEWFSTATAT)
499 SYSCALL_DEFINE4(newfstatat, int, dfd, const ch 362 SYSCALL_DEFINE4(newfstatat, int, dfd, const char __user *, filename,
500 struct stat __user *, statbuf, 363 struct stat __user *, statbuf, int, flag)
501 { 364 {
502 struct kstat stat; 365 struct kstat stat;
503 int error; 366 int error;
504 367
505 error = vfs_fstatat(dfd, filename, &st 368 error = vfs_fstatat(dfd, filename, &stat, flag);
506 if (error) 369 if (error)
507 return error; 370 return error;
508 return cp_new_stat(&stat, statbuf); 371 return cp_new_stat(&stat, statbuf);
509 } 372 }
510 #endif 373 #endif
511 374
512 SYSCALL_DEFINE2(newfstat, unsigned int, fd, st 375 SYSCALL_DEFINE2(newfstat, unsigned int, fd, struct stat __user *, statbuf)
513 { 376 {
514 struct kstat stat; 377 struct kstat stat;
515 int error = vfs_fstat(fd, &stat); 378 int error = vfs_fstat(fd, &stat);
516 379
517 if (!error) 380 if (!error)
518 error = cp_new_stat(&stat, sta 381 error = cp_new_stat(&stat, statbuf);
519 382
520 return error; 383 return error;
521 } 384 }
522 #endif 385 #endif
523 386
524 static int do_readlinkat(int dfd, const char _ 387 static int do_readlinkat(int dfd, const char __user *pathname,
525 char __user *buf, int 388 char __user *buf, int bufsiz)
526 { 389 {
527 struct path path; 390 struct path path;
528 struct filename *name; <<
529 int error; 391 int error;
>> 392 int empty = 0;
530 unsigned int lookup_flags = LOOKUP_EMP 393 unsigned int lookup_flags = LOOKUP_EMPTY;
531 394
532 if (bufsiz <= 0) 395 if (bufsiz <= 0)
533 return -EINVAL; 396 return -EINVAL;
534 397
535 retry: 398 retry:
536 name = getname_flags(pathname, lookup_ !! 399 error = user_path_at_empty(dfd, pathname, lookup_flags, &path, &empty);
537 error = filename_lookup(dfd, name, loo !! 400 if (!error) {
538 if (unlikely(error)) { !! 401 struct inode *inode = d_backing_inode(path.dentry);
539 putname(name); !! 402
540 return error; !! 403 error = empty ? -ENOENT : -EINVAL;
541 } !! 404 /*
542 !! 405 * AFS mountpoints allow readlink(2) but are not symlinks
543 /* !! 406 */
544 * AFS mountpoints allow readlink(2) b !! 407 if (d_is_symlink(path.dentry) || inode->i_op->readlink) {
545 */ !! 408 error = security_inode_readlink(path.dentry);
546 if (d_is_symlink(path.dentry) || !! 409 if (!error) {
547 d_backing_inode(path.dentry)->i_op !! 410 touch_atime(&path);
548 error = security_inode_readlin !! 411 error = vfs_readlink(path.dentry, buf, bufsiz);
549 if (!error) { !! 412 }
550 touch_atime(&path); !! 413 }
551 error = vfs_readlink(p !! 414 path_put(&path);
>> 415 if (retry_estale(error, lookup_flags)) {
>> 416 lookup_flags |= LOOKUP_REVAL;
>> 417 goto retry;
552 } 418 }
553 } else { <<
554 error = (name->name[0] == '\0' <<
555 } <<
556 path_put(&path); <<
557 putname(name); <<
558 if (retry_estale(error, lookup_flags)) <<
559 lookup_flags |= LOOKUP_REVAL; <<
560 goto retry; <<
561 } 419 }
562 return error; 420 return error;
563 } 421 }
564 422
565 SYSCALL_DEFINE4(readlinkat, int, dfd, const ch 423 SYSCALL_DEFINE4(readlinkat, int, dfd, const char __user *, pathname,
566 char __user *, buf, int, bufsi 424 char __user *, buf, int, bufsiz)
567 { 425 {
568 return do_readlinkat(dfd, pathname, bu 426 return do_readlinkat(dfd, pathname, buf, bufsiz);
569 } 427 }
570 428
571 SYSCALL_DEFINE3(readlink, const char __user *, 429 SYSCALL_DEFINE3(readlink, const char __user *, path, char __user *, buf,
572 int, bufsiz) 430 int, bufsiz)
573 { 431 {
574 return do_readlinkat(AT_FDCWD, path, b 432 return do_readlinkat(AT_FDCWD, path, buf, bufsiz);
575 } 433 }
576 434
577 435
578 /* ---------- LFS-64 ----------- */ 436 /* ---------- LFS-64 ----------- */
579 #if defined(__ARCH_WANT_STAT64) || defined(__A 437 #if defined(__ARCH_WANT_STAT64) || defined(__ARCH_WANT_COMPAT_STAT64)
580 438
581 #ifndef INIT_STRUCT_STAT64_PADDING 439 #ifndef INIT_STRUCT_STAT64_PADDING
582 # define INIT_STRUCT_STAT64_PADDING(st) memse 440 # define INIT_STRUCT_STAT64_PADDING(st) memset(&st, 0, sizeof(st))
583 #endif 441 #endif
584 442
585 static long cp_new_stat64(struct kstat *stat, 443 static long cp_new_stat64(struct kstat *stat, struct stat64 __user *statbuf)
586 { 444 {
587 struct stat64 tmp; 445 struct stat64 tmp;
588 446
589 INIT_STRUCT_STAT64_PADDING(tmp); 447 INIT_STRUCT_STAT64_PADDING(tmp);
590 #ifdef CONFIG_MIPS 448 #ifdef CONFIG_MIPS
591 /* mips has weird padding, so we don't 449 /* mips has weird padding, so we don't get 64 bits there */
592 tmp.st_dev = new_encode_dev(stat->dev) 450 tmp.st_dev = new_encode_dev(stat->dev);
593 tmp.st_rdev = new_encode_dev(stat->rde 451 tmp.st_rdev = new_encode_dev(stat->rdev);
594 #else 452 #else
595 tmp.st_dev = huge_encode_dev(stat->dev 453 tmp.st_dev = huge_encode_dev(stat->dev);
596 tmp.st_rdev = huge_encode_dev(stat->rd 454 tmp.st_rdev = huge_encode_dev(stat->rdev);
597 #endif 455 #endif
598 tmp.st_ino = stat->ino; 456 tmp.st_ino = stat->ino;
599 if (sizeof(tmp.st_ino) < sizeof(stat-> 457 if (sizeof(tmp.st_ino) < sizeof(stat->ino) && tmp.st_ino != stat->ino)
600 return -EOVERFLOW; 458 return -EOVERFLOW;
601 #ifdef STAT64_HAS_BROKEN_ST_INO 459 #ifdef STAT64_HAS_BROKEN_ST_INO
602 tmp.__st_ino = stat->ino; 460 tmp.__st_ino = stat->ino;
603 #endif 461 #endif
604 tmp.st_mode = stat->mode; 462 tmp.st_mode = stat->mode;
605 tmp.st_nlink = stat->nlink; 463 tmp.st_nlink = stat->nlink;
606 tmp.st_uid = from_kuid_munged(current_ 464 tmp.st_uid = from_kuid_munged(current_user_ns(), stat->uid);
607 tmp.st_gid = from_kgid_munged(current_ 465 tmp.st_gid = from_kgid_munged(current_user_ns(), stat->gid);
608 tmp.st_atime = stat->atime.tv_sec; 466 tmp.st_atime = stat->atime.tv_sec;
609 tmp.st_atime_nsec = stat->atime.tv_nse 467 tmp.st_atime_nsec = stat->atime.tv_nsec;
610 tmp.st_mtime = stat->mtime.tv_sec; 468 tmp.st_mtime = stat->mtime.tv_sec;
611 tmp.st_mtime_nsec = stat->mtime.tv_nse 469 tmp.st_mtime_nsec = stat->mtime.tv_nsec;
612 tmp.st_ctime = stat->ctime.tv_sec; 470 tmp.st_ctime = stat->ctime.tv_sec;
613 tmp.st_ctime_nsec = stat->ctime.tv_nse 471 tmp.st_ctime_nsec = stat->ctime.tv_nsec;
614 tmp.st_size = stat->size; 472 tmp.st_size = stat->size;
615 tmp.st_blocks = stat->blocks; 473 tmp.st_blocks = stat->blocks;
616 tmp.st_blksize = stat->blksize; 474 tmp.st_blksize = stat->blksize;
617 return copy_to_user(statbuf,&tmp,sizeo 475 return copy_to_user(statbuf,&tmp,sizeof(tmp)) ? -EFAULT : 0;
618 } 476 }
619 477
620 SYSCALL_DEFINE2(stat64, const char __user *, f 478 SYSCALL_DEFINE2(stat64, const char __user *, filename,
621 struct stat64 __user *, statbu 479 struct stat64 __user *, statbuf)
622 { 480 {
623 struct kstat stat; 481 struct kstat stat;
624 int error = vfs_stat(filename, &stat); 482 int error = vfs_stat(filename, &stat);
625 483
626 if (!error) 484 if (!error)
627 error = cp_new_stat64(&stat, s 485 error = cp_new_stat64(&stat, statbuf);
628 486
629 return error; 487 return error;
630 } 488 }
631 489
632 SYSCALL_DEFINE2(lstat64, const char __user *, 490 SYSCALL_DEFINE2(lstat64, const char __user *, filename,
633 struct stat64 __user *, statbu 491 struct stat64 __user *, statbuf)
634 { 492 {
635 struct kstat stat; 493 struct kstat stat;
636 int error = vfs_lstat(filename, &stat) 494 int error = vfs_lstat(filename, &stat);
637 495
638 if (!error) 496 if (!error)
639 error = cp_new_stat64(&stat, s 497 error = cp_new_stat64(&stat, statbuf);
640 498
641 return error; 499 return error;
642 } 500 }
643 501
644 SYSCALL_DEFINE2(fstat64, unsigned long, fd, st 502 SYSCALL_DEFINE2(fstat64, unsigned long, fd, struct stat64 __user *, statbuf)
645 { 503 {
646 struct kstat stat; 504 struct kstat stat;
647 int error = vfs_fstat(fd, &stat); 505 int error = vfs_fstat(fd, &stat);
648 506
649 if (!error) 507 if (!error)
650 error = cp_new_stat64(&stat, s 508 error = cp_new_stat64(&stat, statbuf);
651 509
652 return error; 510 return error;
653 } 511 }
654 512
655 SYSCALL_DEFINE4(fstatat64, int, dfd, const cha 513 SYSCALL_DEFINE4(fstatat64, int, dfd, const char __user *, filename,
656 struct stat64 __user *, statbu 514 struct stat64 __user *, statbuf, int, flag)
657 { 515 {
658 struct kstat stat; 516 struct kstat stat;
659 int error; 517 int error;
660 518
661 error = vfs_fstatat(dfd, filename, &st 519 error = vfs_fstatat(dfd, filename, &stat, flag);
662 if (error) 520 if (error)
663 return error; 521 return error;
664 return cp_new_stat64(&stat, statbuf); 522 return cp_new_stat64(&stat, statbuf);
665 } 523 }
666 #endif /* __ARCH_WANT_STAT64 || __ARCH_WANT_CO 524 #endif /* __ARCH_WANT_STAT64 || __ARCH_WANT_COMPAT_STAT64 */
667 525
668 static noinline_for_stack int 526 static noinline_for_stack int
669 cp_statx(const struct kstat *stat, struct stat 527 cp_statx(const struct kstat *stat, struct statx __user *buffer)
670 { 528 {
671 struct statx tmp; 529 struct statx tmp;
672 530
673 memset(&tmp, 0, sizeof(tmp)); 531 memset(&tmp, 0, sizeof(tmp));
674 532
675 /* STATX_CHANGE_COOKIE is kernel-only !! 533 tmp.stx_mask = stat->result_mask;
676 tmp.stx_mask = stat->result_mask & ~ST <<
677 tmp.stx_blksize = stat->blksize; 534 tmp.stx_blksize = stat->blksize;
678 /* STATX_ATTR_CHANGE_MONOTONIC is kern !! 535 tmp.stx_attributes = stat->attributes;
679 tmp.stx_attributes = stat->attributes <<
680 tmp.stx_nlink = stat->nlink; 536 tmp.stx_nlink = stat->nlink;
681 tmp.stx_uid = from_kuid_munged(current 537 tmp.stx_uid = from_kuid_munged(current_user_ns(), stat->uid);
682 tmp.stx_gid = from_kgid_munged(current 538 tmp.stx_gid = from_kgid_munged(current_user_ns(), stat->gid);
683 tmp.stx_mode = stat->mode; 539 tmp.stx_mode = stat->mode;
684 tmp.stx_ino = stat->ino; 540 tmp.stx_ino = stat->ino;
685 tmp.stx_size = stat->size; 541 tmp.stx_size = stat->size;
686 tmp.stx_blocks = stat->blocks; 542 tmp.stx_blocks = stat->blocks;
687 tmp.stx_attributes_mask = stat->attrib 543 tmp.stx_attributes_mask = stat->attributes_mask;
688 tmp.stx_atime.tv_sec = stat->atime.tv_ 544 tmp.stx_atime.tv_sec = stat->atime.tv_sec;
689 tmp.stx_atime.tv_nsec = stat->atime.tv 545 tmp.stx_atime.tv_nsec = stat->atime.tv_nsec;
690 tmp.stx_btime.tv_sec = stat->btime.tv_ 546 tmp.stx_btime.tv_sec = stat->btime.tv_sec;
691 tmp.stx_btime.tv_nsec = stat->btime.tv 547 tmp.stx_btime.tv_nsec = stat->btime.tv_nsec;
692 tmp.stx_ctime.tv_sec = stat->ctime.tv_ 548 tmp.stx_ctime.tv_sec = stat->ctime.tv_sec;
693 tmp.stx_ctime.tv_nsec = stat->ctime.tv 549 tmp.stx_ctime.tv_nsec = stat->ctime.tv_nsec;
694 tmp.stx_mtime.tv_sec = stat->mtime.tv_ 550 tmp.stx_mtime.tv_sec = stat->mtime.tv_sec;
695 tmp.stx_mtime.tv_nsec = stat->mtime.tv 551 tmp.stx_mtime.tv_nsec = stat->mtime.tv_nsec;
696 tmp.stx_rdev_major = MAJOR(stat->rdev) 552 tmp.stx_rdev_major = MAJOR(stat->rdev);
697 tmp.stx_rdev_minor = MINOR(stat->rdev) 553 tmp.stx_rdev_minor = MINOR(stat->rdev);
698 tmp.stx_dev_major = MAJOR(stat->dev); 554 tmp.stx_dev_major = MAJOR(stat->dev);
699 tmp.stx_dev_minor = MINOR(stat->dev); 555 tmp.stx_dev_minor = MINOR(stat->dev);
700 tmp.stx_mnt_id = stat->mnt_id; <<
701 tmp.stx_dio_mem_align = stat->dio_mem_ <<
702 tmp.stx_dio_offset_align = stat->dio_o <<
703 tmp.stx_subvol = stat->subvol; <<
704 tmp.stx_atomic_write_unit_min = stat-> <<
705 tmp.stx_atomic_write_unit_max = stat-> <<
706 tmp.stx_atomic_write_segments_max = st <<
707 556
708 return copy_to_user(buffer, &tmp, size 557 return copy_to_user(buffer, &tmp, sizeof(tmp)) ? -EFAULT : 0;
709 } 558 }
710 559
711 int do_statx(int dfd, struct filename *filenam <<
712 unsigned int mask, struct statx _ <<
713 { <<
714 struct kstat stat; <<
715 int error; <<
716 <<
717 if (mask & STATX__RESERVED) <<
718 return -EINVAL; <<
719 if ((flags & AT_STATX_SYNC_TYPE) == AT <<
720 return -EINVAL; <<
721 <<
722 /* <<
723 * STATX_CHANGE_COOKIE is kernel-only <<
724 * from userland. <<
725 */ <<
726 mask &= ~STATX_CHANGE_COOKIE; <<
727 <<
728 error = vfs_statx(dfd, filename, flags <<
729 if (error) <<
730 return error; <<
731 <<
732 return cp_statx(&stat, buffer); <<
733 } <<
734 <<
735 int do_statx_fd(int fd, unsigned int flags, un <<
736 struct statx __user *buffer) <<
737 { <<
738 struct kstat stat; <<
739 int error; <<
740 <<
741 if (mask & STATX__RESERVED) <<
742 return -EINVAL; <<
743 if ((flags & AT_STATX_SYNC_TYPE) == AT <<
744 return -EINVAL; <<
745 <<
746 /* <<
747 * STATX_CHANGE_COOKIE is kernel-only <<
748 * from userland. <<
749 */ <<
750 mask &= ~STATX_CHANGE_COOKIE; <<
751 <<
752 error = vfs_statx_fd(fd, flags, &stat, <<
753 if (error) <<
754 return error; <<
755 <<
756 return cp_statx(&stat, buffer); <<
757 } <<
758 <<
759 /** 560 /**
760 * sys_statx - System call to get enhanced sta 561 * sys_statx - System call to get enhanced stats
761 * @dfd: Base directory to pathwalk from *or* 562 * @dfd: Base directory to pathwalk from *or* fd to stat.
762 * @filename: File to stat or either NULL or " !! 563 * @filename: File to stat or "" with AT_EMPTY_PATH
763 * @flags: AT_* flags to control pathwalk. 564 * @flags: AT_* flags to control pathwalk.
764 * @mask: Parts of statx struct actually requi 565 * @mask: Parts of statx struct actually required.
765 * @buffer: Result buffer. 566 * @buffer: Result buffer.
766 * 567 *
767 * Note that fstat() can be emulated by settin 568 * Note that fstat() can be emulated by setting dfd to the fd of interest,
768 * supplying "" (or preferably NULL) as the fi !! 569 * supplying "" as the filename and setting AT_EMPTY_PATH in the flags.
769 * in the flags. <<
770 */ 570 */
771 SYSCALL_DEFINE5(statx, 571 SYSCALL_DEFINE5(statx,
772 int, dfd, const char __user *, 572 int, dfd, const char __user *, filename, unsigned, flags,
773 unsigned int, mask, 573 unsigned int, mask,
774 struct statx __user *, buffer) 574 struct statx __user *, buffer)
775 { 575 {
776 int ret; !! 576 struct kstat stat;
777 unsigned lflags; !! 577 int error;
778 struct filename *name; <<
779 <<
780 /* <<
781 * Short-circuit handling of NULL and <<
782 * <<
783 * For a NULL path we require and acce <<
784 * (possibly |'d with AT_STATX flags). <<
785 * <<
786 * However, glibc on 32-bit architectu <<
787 * with the "" pathname and AT_NO_AUTO <<
788 * Supporting this results in the ugli <<
789 */ <<
790 lflags = flags & ~(AT_NO_AUTOMOUNT | A <<
791 if (lflags == AT_EMPTY_PATH && vfs_emp <<
792 return do_statx_fd(dfd, flags <<
793 <<
794 name = getname_flags(filename, getname <<
795 ret = do_statx(dfd, name, flags, mask, <<
796 putname(name); <<
797 578
798 return ret; !! 579 if (mask & STATX__RESERVED)
>> 580 return -EINVAL;
>> 581 if ((flags & AT_STATX_SYNC_TYPE) == AT_STATX_SYNC_TYPE)
>> 582 return -EINVAL;
>> 583
>> 584 error = vfs_statx(dfd, filename, flags, &stat, mask);
>> 585 if (error)
>> 586 return error;
>> 587
>> 588 return cp_statx(&stat, buffer);
799 } 589 }
800 590
801 #if defined(CONFIG_COMPAT) && defined(__ARCH_W !! 591 #ifdef CONFIG_COMPAT
802 static int cp_compat_stat(struct kstat *stat, 592 static int cp_compat_stat(struct kstat *stat, struct compat_stat __user *ubuf)
803 { 593 {
804 struct compat_stat tmp; 594 struct compat_stat tmp;
805 595
806 if (sizeof(tmp.st_dev) < 4 && !old_val !! 596 if (!old_valid_dev(stat->dev) || !old_valid_dev(stat->rdev))
807 return -EOVERFLOW; <<
808 if (sizeof(tmp.st_rdev) < 4 && !old_va <<
809 return -EOVERFLOW; 597 return -EOVERFLOW;
810 598
811 memset(&tmp, 0, sizeof(tmp)); 599 memset(&tmp, 0, sizeof(tmp));
812 tmp.st_dev = new_encode_dev(stat->dev) !! 600 tmp.st_dev = old_encode_dev(stat->dev);
813 tmp.st_ino = stat->ino; 601 tmp.st_ino = stat->ino;
814 if (sizeof(tmp.st_ino) < sizeof(stat-> 602 if (sizeof(tmp.st_ino) < sizeof(stat->ino) && tmp.st_ino != stat->ino)
815 return -EOVERFLOW; 603 return -EOVERFLOW;
816 tmp.st_mode = stat->mode; 604 tmp.st_mode = stat->mode;
817 tmp.st_nlink = stat->nlink; 605 tmp.st_nlink = stat->nlink;
818 if (tmp.st_nlink != stat->nlink) 606 if (tmp.st_nlink != stat->nlink)
819 return -EOVERFLOW; 607 return -EOVERFLOW;
820 SET_UID(tmp.st_uid, from_kuid_munged(c 608 SET_UID(tmp.st_uid, from_kuid_munged(current_user_ns(), stat->uid));
821 SET_GID(tmp.st_gid, from_kgid_munged(c 609 SET_GID(tmp.st_gid, from_kgid_munged(current_user_ns(), stat->gid));
822 tmp.st_rdev = new_encode_dev(stat->rde !! 610 tmp.st_rdev = old_encode_dev(stat->rdev);
823 if ((u64) stat->size > MAX_NON_LFS) 611 if ((u64) stat->size > MAX_NON_LFS)
824 return -EOVERFLOW; 612 return -EOVERFLOW;
825 tmp.st_size = stat->size; 613 tmp.st_size = stat->size;
826 tmp.st_atime = stat->atime.tv_sec; 614 tmp.st_atime = stat->atime.tv_sec;
827 tmp.st_atime_nsec = stat->atime.tv_nse 615 tmp.st_atime_nsec = stat->atime.tv_nsec;
828 tmp.st_mtime = stat->mtime.tv_sec; 616 tmp.st_mtime = stat->mtime.tv_sec;
829 tmp.st_mtime_nsec = stat->mtime.tv_nse 617 tmp.st_mtime_nsec = stat->mtime.tv_nsec;
830 tmp.st_ctime = stat->ctime.tv_sec; 618 tmp.st_ctime = stat->ctime.tv_sec;
831 tmp.st_ctime_nsec = stat->ctime.tv_nse 619 tmp.st_ctime_nsec = stat->ctime.tv_nsec;
832 tmp.st_blocks = stat->blocks; 620 tmp.st_blocks = stat->blocks;
833 tmp.st_blksize = stat->blksize; 621 tmp.st_blksize = stat->blksize;
834 return copy_to_user(ubuf, &tmp, sizeof 622 return copy_to_user(ubuf, &tmp, sizeof(tmp)) ? -EFAULT : 0;
835 } 623 }
836 624
837 COMPAT_SYSCALL_DEFINE2(newstat, const char __u 625 COMPAT_SYSCALL_DEFINE2(newstat, const char __user *, filename,
838 struct compat_stat __us 626 struct compat_stat __user *, statbuf)
839 { 627 {
840 struct kstat stat; 628 struct kstat stat;
841 int error; 629 int error;
842 630
843 error = vfs_stat(filename, &stat); 631 error = vfs_stat(filename, &stat);
844 if (error) 632 if (error)
845 return error; 633 return error;
846 return cp_compat_stat(&stat, statbuf); 634 return cp_compat_stat(&stat, statbuf);
847 } 635 }
848 636
849 COMPAT_SYSCALL_DEFINE2(newlstat, const char __ 637 COMPAT_SYSCALL_DEFINE2(newlstat, const char __user *, filename,
850 struct compat_stat __us 638 struct compat_stat __user *, statbuf)
851 { 639 {
852 struct kstat stat; 640 struct kstat stat;
853 int error; 641 int error;
854 642
855 error = vfs_lstat(filename, &stat); 643 error = vfs_lstat(filename, &stat);
856 if (error) 644 if (error)
857 return error; 645 return error;
858 return cp_compat_stat(&stat, statbuf); 646 return cp_compat_stat(&stat, statbuf);
859 } 647 }
860 648
861 #ifndef __ARCH_WANT_STAT64 649 #ifndef __ARCH_WANT_STAT64
862 COMPAT_SYSCALL_DEFINE4(newfstatat, unsigned in 650 COMPAT_SYSCALL_DEFINE4(newfstatat, unsigned int, dfd,
863 const char __user *, fi 651 const char __user *, filename,
864 struct compat_stat __us 652 struct compat_stat __user *, statbuf, int, flag)
865 { 653 {
866 struct kstat stat; 654 struct kstat stat;
867 int error; 655 int error;
868 656
869 error = vfs_fstatat(dfd, filename, &st 657 error = vfs_fstatat(dfd, filename, &stat, flag);
870 if (error) 658 if (error)
871 return error; 659 return error;
872 return cp_compat_stat(&stat, statbuf); 660 return cp_compat_stat(&stat, statbuf);
873 } 661 }
874 #endif 662 #endif
875 663
876 COMPAT_SYSCALL_DEFINE2(newfstat, unsigned int, 664 COMPAT_SYSCALL_DEFINE2(newfstat, unsigned int, fd,
877 struct compat_stat __us 665 struct compat_stat __user *, statbuf)
878 { 666 {
879 struct kstat stat; 667 struct kstat stat;
880 int error = vfs_fstat(fd, &stat); 668 int error = vfs_fstat(fd, &stat);
881 669
882 if (!error) 670 if (!error)
883 error = cp_compat_stat(&stat, 671 error = cp_compat_stat(&stat, statbuf);
884 return error; 672 return error;
885 } 673 }
886 #endif 674 #endif
887 675
888 /* Caller is here responsible for sufficient l 676 /* Caller is here responsible for sufficient locking (ie. inode->i_lock) */
889 void __inode_add_bytes(struct inode *inode, lo 677 void __inode_add_bytes(struct inode *inode, loff_t bytes)
890 { 678 {
891 inode->i_blocks += bytes >> 9; 679 inode->i_blocks += bytes >> 9;
892 bytes &= 511; 680 bytes &= 511;
893 inode->i_bytes += bytes; 681 inode->i_bytes += bytes;
894 if (inode->i_bytes >= 512) { 682 if (inode->i_bytes >= 512) {
895 inode->i_blocks++; 683 inode->i_blocks++;
896 inode->i_bytes -= 512; 684 inode->i_bytes -= 512;
897 } 685 }
898 } 686 }
899 EXPORT_SYMBOL(__inode_add_bytes); 687 EXPORT_SYMBOL(__inode_add_bytes);
900 688
901 void inode_add_bytes(struct inode *inode, loff 689 void inode_add_bytes(struct inode *inode, loff_t bytes)
902 { 690 {
903 spin_lock(&inode->i_lock); 691 spin_lock(&inode->i_lock);
904 __inode_add_bytes(inode, bytes); 692 __inode_add_bytes(inode, bytes);
905 spin_unlock(&inode->i_lock); 693 spin_unlock(&inode->i_lock);
906 } 694 }
907 695
908 EXPORT_SYMBOL(inode_add_bytes); 696 EXPORT_SYMBOL(inode_add_bytes);
909 697
910 void __inode_sub_bytes(struct inode *inode, lo 698 void __inode_sub_bytes(struct inode *inode, loff_t bytes)
911 { 699 {
912 inode->i_blocks -= bytes >> 9; 700 inode->i_blocks -= bytes >> 9;
913 bytes &= 511; 701 bytes &= 511;
914 if (inode->i_bytes < bytes) { 702 if (inode->i_bytes < bytes) {
915 inode->i_blocks--; 703 inode->i_blocks--;
916 inode->i_bytes += 512; 704 inode->i_bytes += 512;
917 } 705 }
918 inode->i_bytes -= bytes; 706 inode->i_bytes -= bytes;
919 } 707 }
920 708
921 EXPORT_SYMBOL(__inode_sub_bytes); 709 EXPORT_SYMBOL(__inode_sub_bytes);
922 710
923 void inode_sub_bytes(struct inode *inode, loff 711 void inode_sub_bytes(struct inode *inode, loff_t bytes)
924 { 712 {
925 spin_lock(&inode->i_lock); 713 spin_lock(&inode->i_lock);
926 __inode_sub_bytes(inode, bytes); 714 __inode_sub_bytes(inode, bytes);
927 spin_unlock(&inode->i_lock); 715 spin_unlock(&inode->i_lock);
928 } 716 }
929 717
930 EXPORT_SYMBOL(inode_sub_bytes); 718 EXPORT_SYMBOL(inode_sub_bytes);
931 719
932 loff_t inode_get_bytes(struct inode *inode) 720 loff_t inode_get_bytes(struct inode *inode)
933 { 721 {
934 loff_t ret; 722 loff_t ret;
935 723
936 spin_lock(&inode->i_lock); 724 spin_lock(&inode->i_lock);
937 ret = __inode_get_bytes(inode); 725 ret = __inode_get_bytes(inode);
938 spin_unlock(&inode->i_lock); 726 spin_unlock(&inode->i_lock);
939 return ret; 727 return ret;
940 } 728 }
941 729
942 EXPORT_SYMBOL(inode_get_bytes); 730 EXPORT_SYMBOL(inode_get_bytes);
943 731
944 void inode_set_bytes(struct inode *inode, loff 732 void inode_set_bytes(struct inode *inode, loff_t bytes)
945 { 733 {
946 /* Caller is here responsible for suff 734 /* Caller is here responsible for sufficient locking
947 * (ie. inode->i_lock) */ 735 * (ie. inode->i_lock) */
948 inode->i_blocks = bytes >> 9; 736 inode->i_blocks = bytes >> 9;
949 inode->i_bytes = bytes & 511; 737 inode->i_bytes = bytes & 511;
950 } 738 }
951 739
952 EXPORT_SYMBOL(inode_set_bytes); 740 EXPORT_SYMBOL(inode_set_bytes);
953 741
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