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