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