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