Blame view
fs/xattr.c
17.3 KB
1da177e4c Linux-2.6.12-rc2 |
1 2 3 4 5 6 7 8 9 10 11 |
/* File: fs/xattr.c Extended attribute handling. Copyright (C) 2001 by Andreas Gruenbacher <a.gruenbacher@computer.org> Copyright (C) 2001 SGI - Silicon Graphics, Inc <linux-xfs@oss.sgi.com> Copyright (c) 2004 Red Hat, Inc., James Morris <jmorris@redhat.com> */ #include <linux/fs.h> #include <linux/slab.h> |
1da177e4c Linux-2.6.12-rc2 |
12 13 |
#include <linux/file.h> #include <linux/xattr.h> |
18f335aff [PATCH] r/o bind ... |
14 |
#include <linux/mount.h> |
1da177e4c Linux-2.6.12-rc2 |
15 16 |
#include <linux/namei.h> #include <linux/security.h> |
c7b87de23 evm: evm_inode_po... |
17 |
#include <linux/evm.h> |
1da177e4c Linux-2.6.12-rc2 |
18 19 |
#include <linux/syscalls.h> #include <linux/module.h> |
0eeca2830 [PATCH] inotify |
20 |
#include <linux/fsnotify.h> |
73241ccca [PATCH] Collect m... |
21 |
#include <linux/audit.h> |
1da177e4c Linux-2.6.12-rc2 |
22 |
#include <asm/uaccess.h> |
5be196e5f [PATCH] add vfs_*... |
23 |
|
e0ad7b073 [PATCH] move xatt... |
24 25 26 27 28 29 30 31 32 33 34 35 |
/* * Check permissions for extended attribute access. This is a bit complicated * because different namespaces have very different rules. */ static int xattr_permission(struct inode *inode, const char *name, int mask) { /* * We can never set or remove an extended attribute on a read-only * filesystem or on an immutable / append-only inode. */ if (mask & MAY_WRITE) { |
e0ad7b073 [PATCH] move xatt... |
36 37 38 39 40 41 42 43 44 45 46 47 48 |
if (IS_IMMUTABLE(inode) || IS_APPEND(inode)) return -EPERM; } /* * No restriction for security.* and system.* from the VFS. Decision * on these is left to the underlying filesystem / security module. */ if (!strncmp(name, XATTR_SECURITY_PREFIX, XATTR_SECURITY_PREFIX_LEN) || !strncmp(name, XATTR_SYSTEM_PREFIX, XATTR_SYSTEM_PREFIX_LEN)) return 0; /* |
55b23bde1 xattr: Fix error ... |
49 |
* The trusted.* namespace can only be accessed by privileged users. |
e0ad7b073 [PATCH] move xatt... |
50 |
*/ |
55b23bde1 xattr: Fix error ... |
51 52 53 54 55 |
if (!strncmp(name, XATTR_TRUSTED_PREFIX, XATTR_TRUSTED_PREFIX_LEN)) { if (!capable(CAP_SYS_ADMIN)) return (mask & MAY_WRITE) ? -EPERM : -ENODATA; return 0; } |
e0ad7b073 [PATCH] move xatt... |
56 |
|
55b23bde1 xattr: Fix error ... |
57 58 |
/* * In the user.* namespace, only regular files and directories can have |
f1f2d8713 [PATCH] Fix user.... |
59 |
* extended attributes. For sticky directories, only the owner and |
55b23bde1 xattr: Fix error ... |
60 |
* privileged users can write attributes. |
f1f2d8713 [PATCH] Fix user.... |
61 |
*/ |
e0ad7b073 [PATCH] move xatt... |
62 |
if (!strncmp(name, XATTR_USER_PREFIX, XATTR_USER_PREFIX_LEN)) { |
f1f2d8713 [PATCH] Fix user.... |
63 |
if (!S_ISREG(inode->i_mode) && !S_ISDIR(inode->i_mode)) |
55b23bde1 xattr: Fix error ... |
64 |
return (mask & MAY_WRITE) ? -EPERM : -ENODATA; |
f1f2d8713 [PATCH] Fix user.... |
65 |
if (S_ISDIR(inode->i_mode) && (inode->i_mode & S_ISVTX) && |
2e1496707 userns: rename is... |
66 |
(mask & MAY_WRITE) && !inode_owner_or_capable(inode)) |
e0ad7b073 [PATCH] move xatt... |
67 68 |
return -EPERM; } |
f419a2e3b [PATCH] kill name... |
69 |
return inode_permission(inode, mask); |
e0ad7b073 [PATCH] move xatt... |
70 |
} |
b1ab7e4b2 VFS: Factor out p... |
71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 |
/** * __vfs_setxattr_noperm - perform setxattr operation without performing * permission checks. * * @dentry - object to perform setxattr on * @name - xattr name to set * @value - value to set @name to * @size - size of @value * @flags - flags to pass into filesystem operations * * returns the result of the internal setxattr or setsecurity operations. * * This function requires the caller to lock the inode's i_mutex before it * is executed. It also assumes that the caller will make the appropriate * permission checks. */ int __vfs_setxattr_noperm(struct dentry *dentry, const char *name, const void *value, size_t size, int flags) |
5be196e5f [PATCH] add vfs_*... |
89 90 |
{ struct inode *inode = dentry->d_inode; |
b1ab7e4b2 VFS: Factor out p... |
91 |
int error = -EOPNOTSUPP; |
69b457329 Cache xattr secur... |
92 93 |
int issec = !strncmp(name, XATTR_SECURITY_PREFIX, XATTR_SECURITY_PREFIX_LEN); |
e0ad7b073 [PATCH] move xatt... |
94 |
|
69b457329 Cache xattr secur... |
95 96 |
if (issec) inode->i_flags &= ~S_NOSEC; |
5be196e5f [PATCH] add vfs_*... |
97 98 99 100 101 102 103 |
if (inode->i_op->setxattr) { error = inode->i_op->setxattr(dentry, name, value, size, flags); if (!error) { fsnotify_xattr(dentry); security_inode_post_setxattr(dentry, name, value, size, flags); } |
69b457329 Cache xattr secur... |
104 |
} else if (issec) { |
e0ad7b073 [PATCH] move xatt... |
105 |
const char *suffix = name + XATTR_SECURITY_PREFIX_LEN; |
5be196e5f [PATCH] add vfs_*... |
106 107 108 109 110 |
error = security_inode_setsecurity(inode, suffix, value, size, flags); if (!error) fsnotify_xattr(dentry); } |
b1ab7e4b2 VFS: Factor out p... |
111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 |
return error; } int vfs_setxattr(struct dentry *dentry, const char *name, const void *value, size_t size, int flags) { struct inode *inode = dentry->d_inode; int error; error = xattr_permission(inode, name, MAY_WRITE); if (error) return error; mutex_lock(&inode->i_mutex); error = security_inode_setxattr(dentry, name, value, size, flags); if (error) goto out; error = __vfs_setxattr_noperm(dentry, name, value, size, flags); |
5be196e5f [PATCH] add vfs_*... |
133 134 135 136 137 138 139 |
out: mutex_unlock(&inode->i_mutex); return error; } EXPORT_SYMBOL_GPL(vfs_setxattr); ssize_t |
424925940 VFS/Security: Rew... |
140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 |
xattr_getsecurity(struct inode *inode, const char *name, void *value, size_t size) { void *buffer = NULL; ssize_t len; if (!value || !size) { len = security_inode_getsecurity(inode, name, &buffer, false); goto out_noalloc; } len = security_inode_getsecurity(inode, name, &buffer, true); if (len < 0) return len; if (size < len) { len = -ERANGE; goto out; } memcpy(value, buffer, len); out: security_release_secctx(buffer, len); out_noalloc: return len; } EXPORT_SYMBOL_GPL(xattr_getsecurity); |
1601fbad2 xattr: define vfs... |
165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 |
/* * vfs_getxattr_alloc - allocate memory, if necessary, before calling getxattr * * Allocate memory, if not already allocated, or re-allocate correct size, * before retrieving the extended attribute. * * Returns the result of alloc, if failed, or the getxattr operation. */ ssize_t vfs_getxattr_alloc(struct dentry *dentry, const char *name, char **xattr_value, size_t xattr_size, gfp_t flags) { struct inode *inode = dentry->d_inode; char *value = *xattr_value; int error; error = xattr_permission(inode, name, MAY_READ); if (error) return error; if (!inode->i_op->getxattr) return -EOPNOTSUPP; error = inode->i_op->getxattr(dentry, name, NULL, 0); if (error < 0) return error; if (!value || (error > xattr_size)) { value = krealloc(*xattr_value, error + 1, flags); if (!value) return -ENOMEM; memset(value, 0, error + 1); } error = inode->i_op->getxattr(dentry, name, value, error); *xattr_value = value; return error; } /* Compare an extended attribute value with the given value */ int vfs_xattr_cmp(struct dentry *dentry, const char *xattr_name, const char *value, size_t size, gfp_t flags) { char *xattr_value = NULL; int rc; rc = vfs_getxattr_alloc(dentry, xattr_name, &xattr_value, 0, flags); if (rc < 0) return rc; if ((rc != size) || (memcmp(xattr_value, value, rc) != 0)) rc = -EINVAL; else rc = 0; kfree(xattr_value); return rc; } |
424925940 VFS/Security: Rew... |
222 |
ssize_t |
8f0cfa52a xattr: add missin... |
223 |
vfs_getxattr(struct dentry *dentry, const char *name, void *value, size_t size) |
5be196e5f [PATCH] add vfs_*... |
224 225 226 |
{ struct inode *inode = dentry->d_inode; int error; |
e0ad7b073 [PATCH] move xatt... |
227 228 229 |
error = xattr_permission(inode, name, MAY_READ); if (error) return error; |
5be196e5f [PATCH] add vfs_*... |
230 231 232 |
error = security_inode_getxattr(dentry, name); if (error) return error; |
5be196e5f [PATCH] add vfs_*... |
233 |
if (!strncmp(name, XATTR_SECURITY_PREFIX, |
e0ad7b073 [PATCH] move xatt... |
234 235 |
XATTR_SECURITY_PREFIX_LEN)) { const char *suffix = name + XATTR_SECURITY_PREFIX_LEN; |
424925940 VFS/Security: Rew... |
236 |
int ret = xattr_getsecurity(inode, suffix, value, size); |
5be196e5f [PATCH] add vfs_*... |
237 238 239 240 |
/* * Only overwrite the return value if a security module * is actually active. */ |
4bea58053 VFS: Reorder vfs_... |
241 242 243 |
if (ret == -EOPNOTSUPP) goto nolsm; return ret; |
5be196e5f [PATCH] add vfs_*... |
244 |
} |
4bea58053 VFS: Reorder vfs_... |
245 246 247 248 249 |
nolsm: if (inode->i_op->getxattr) error = inode->i_op->getxattr(dentry, name, value, size); else error = -EOPNOTSUPP; |
5be196e5f [PATCH] add vfs_*... |
250 251 252 253 |
return error; } EXPORT_SYMBOL_GPL(vfs_getxattr); |
659564c8a [PATCH] Introduce... |
254 255 256 257 258 259 260 261 262 |
ssize_t vfs_listxattr(struct dentry *d, char *list, size_t size) { ssize_t error; error = security_inode_listxattr(d); if (error) return error; error = -EOPNOTSUPP; |
acfa4380e inode->i_op is ne... |
263 |
if (d->d_inode->i_op->listxattr) { |
659564c8a [PATCH] Introduce... |
264 265 266 267 268 269 270 271 272 |
error = d->d_inode->i_op->listxattr(d, list, size); } else { error = security_inode_listsecurity(d->d_inode, list, size); if (size && error > size) error = -ERANGE; } return error; } EXPORT_SYMBOL_GPL(vfs_listxattr); |
5be196e5f [PATCH] add vfs_*... |
273 |
int |
8f0cfa52a xattr: add missin... |
274 |
vfs_removexattr(struct dentry *dentry, const char *name) |
5be196e5f [PATCH] add vfs_*... |
275 276 277 278 279 280 |
{ struct inode *inode = dentry->d_inode; int error; if (!inode->i_op->removexattr) return -EOPNOTSUPP; |
e0ad7b073 [PATCH] move xatt... |
281 282 283 |
error = xattr_permission(inode, name, MAY_WRITE); if (error) return error; |
5be196e5f [PATCH] add vfs_*... |
284 285 286 287 288 289 290 |
error = security_inode_removexattr(dentry, name); if (error) return error; mutex_lock(&inode->i_mutex); error = inode->i_op->removexattr(dentry, name); mutex_unlock(&inode->i_mutex); |
c7b87de23 evm: evm_inode_po... |
291 |
if (!error) { |
5be196e5f [PATCH] add vfs_*... |
292 |
fsnotify_xattr(dentry); |
c7b87de23 evm: evm_inode_po... |
293 294 |
evm_inode_post_removexattr(dentry, name); } |
5be196e5f [PATCH] add vfs_*... |
295 296 297 |
return error; } EXPORT_SYMBOL_GPL(vfs_removexattr); |
1da177e4c Linux-2.6.12-rc2 |
298 299 300 301 |
/* * Extended attribute SET operations */ static long |
8f0cfa52a xattr: add missin... |
302 |
setxattr(struct dentry *d, const char __user *name, const void __user *value, |
1da177e4c Linux-2.6.12-rc2 |
303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 |
size_t size, int flags) { int error; void *kvalue = NULL; char kname[XATTR_NAME_MAX + 1]; if (flags & ~(XATTR_CREATE|XATTR_REPLACE)) return -EINVAL; error = strncpy_from_user(kname, name, sizeof(kname)); if (error == 0 || error == sizeof(kname)) error = -ERANGE; if (error < 0) return error; if (size) { if (size > XATTR_SIZE_MAX) return -E2BIG; |
3939fcde2 xattr: use memdup... |
321 322 323 |
kvalue = memdup_user(value, size); if (IS_ERR(kvalue)) return PTR_ERR(kvalue); |
1da177e4c Linux-2.6.12-rc2 |
324 |
} |
5be196e5f [PATCH] add vfs_*... |
325 |
error = vfs_setxattr(d, kname, kvalue, size, flags); |
f99d49adf [PATCH] kfree cle... |
326 |
kfree(kvalue); |
1da177e4c Linux-2.6.12-rc2 |
327 328 |
return error; } |
64fd1de3d [CVE-2009-0029] S... |
329 330 331 |
SYSCALL_DEFINE5(setxattr, const char __user *, pathname, const char __user *, name, const void __user *, value, size_t, size, int, flags) |
1da177e4c Linux-2.6.12-rc2 |
332 |
{ |
2d8f30380 [PATCH] sanitize ... |
333 |
struct path path; |
1da177e4c Linux-2.6.12-rc2 |
334 |
int error; |
2d8f30380 [PATCH] sanitize ... |
335 |
error = user_path(pathname, &path); |
1da177e4c Linux-2.6.12-rc2 |
336 337 |
if (error) return error; |
2d8f30380 [PATCH] sanitize ... |
338 |
error = mnt_want_write(path.mnt); |
18f335aff [PATCH] r/o bind ... |
339 |
if (!error) { |
2d8f30380 [PATCH] sanitize ... |
340 341 |
error = setxattr(path.dentry, name, value, size, flags); mnt_drop_write(path.mnt); |
18f335aff [PATCH] r/o bind ... |
342 |
} |
2d8f30380 [PATCH] sanitize ... |
343 |
path_put(&path); |
1da177e4c Linux-2.6.12-rc2 |
344 345 |
return error; } |
64fd1de3d [CVE-2009-0029] S... |
346 347 348 |
SYSCALL_DEFINE5(lsetxattr, const char __user *, pathname, const char __user *, name, const void __user *, value, size_t, size, int, flags) |
1da177e4c Linux-2.6.12-rc2 |
349 |
{ |
2d8f30380 [PATCH] sanitize ... |
350 |
struct path path; |
1da177e4c Linux-2.6.12-rc2 |
351 |
int error; |
2d8f30380 [PATCH] sanitize ... |
352 |
error = user_lpath(pathname, &path); |
1da177e4c Linux-2.6.12-rc2 |
353 354 |
if (error) return error; |
2d8f30380 [PATCH] sanitize ... |
355 |
error = mnt_want_write(path.mnt); |
18f335aff [PATCH] r/o bind ... |
356 |
if (!error) { |
2d8f30380 [PATCH] sanitize ... |
357 358 |
error = setxattr(path.dentry, name, value, size, flags); mnt_drop_write(path.mnt); |
18f335aff [PATCH] r/o bind ... |
359 |
} |
2d8f30380 [PATCH] sanitize ... |
360 |
path_put(&path); |
1da177e4c Linux-2.6.12-rc2 |
361 362 |
return error; } |
64fd1de3d [CVE-2009-0029] S... |
363 364 |
SYSCALL_DEFINE5(fsetxattr, int, fd, const char __user *, name, const void __user *,value, size_t, size, int, flags) |
1da177e4c Linux-2.6.12-rc2 |
365 366 |
{ struct file *f; |
73241ccca [PATCH] Collect m... |
367 |
struct dentry *dentry; |
1da177e4c Linux-2.6.12-rc2 |
368 369 370 371 372 |
int error = -EBADF; f = fget(fd); if (!f) return error; |
0f7fc9e4d [PATCH] VFS: chan... |
373 |
dentry = f->f_path.dentry; |
5a190ae69 [PATCH] pass dent... |
374 |
audit_inode(NULL, dentry); |
96029c4e0 fs: introduce mnt... |
375 |
error = mnt_want_write_file(f); |
18f335aff [PATCH] r/o bind ... |
376 377 378 379 |
if (!error) { error = setxattr(dentry, name, value, size, flags); mnt_drop_write(f->f_path.mnt); } |
1da177e4c Linux-2.6.12-rc2 |
380 381 382 383 384 385 386 387 |
fput(f); return error; } /* * Extended attribute GET operations */ static ssize_t |
8f0cfa52a xattr: add missin... |
388 389 |
getxattr(struct dentry *d, const char __user *name, void __user *value, size_t size) |
1da177e4c Linux-2.6.12-rc2 |
390 391 392 393 394 395 396 397 398 399 400 401 402 403 |
{ ssize_t error; void *kvalue = NULL; char kname[XATTR_NAME_MAX + 1]; error = strncpy_from_user(kname, name, sizeof(kname)); if (error == 0 || error == sizeof(kname)) error = -ERANGE; if (error < 0) return error; if (size) { if (size > XATTR_SIZE_MAX) size = XATTR_SIZE_MAX; |
d381d8a9a [PATCH] SELinux: ... |
404 |
kvalue = kzalloc(size, GFP_KERNEL); |
1da177e4c Linux-2.6.12-rc2 |
405 406 407 |
if (!kvalue) return -ENOMEM; } |
5be196e5f [PATCH] add vfs_*... |
408 |
error = vfs_getxattr(d, kname, kvalue, size); |
f549d6c18 [PATCH] Generic V... |
409 410 411 412 413 414 415 |
if (error > 0) { if (size && copy_to_user(value, kvalue, error)) error = -EFAULT; } else if (error == -ERANGE && size >= XATTR_SIZE_MAX) { /* The file system tried to returned a value bigger than XATTR_SIZE_MAX bytes. Not possible. */ error = -E2BIG; |
1da177e4c Linux-2.6.12-rc2 |
416 |
} |
f99d49adf [PATCH] kfree cle... |
417 |
kfree(kvalue); |
1da177e4c Linux-2.6.12-rc2 |
418 419 |
return error; } |
64fd1de3d [CVE-2009-0029] S... |
420 421 |
SYSCALL_DEFINE4(getxattr, const char __user *, pathname, const char __user *, name, void __user *, value, size_t, size) |
1da177e4c Linux-2.6.12-rc2 |
422 |
{ |
2d8f30380 [PATCH] sanitize ... |
423 |
struct path path; |
1da177e4c Linux-2.6.12-rc2 |
424 |
ssize_t error; |
2d8f30380 [PATCH] sanitize ... |
425 |
error = user_path(pathname, &path); |
1da177e4c Linux-2.6.12-rc2 |
426 427 |
if (error) return error; |
2d8f30380 [PATCH] sanitize ... |
428 429 |
error = getxattr(path.dentry, name, value, size); path_put(&path); |
1da177e4c Linux-2.6.12-rc2 |
430 431 |
return error; } |
64fd1de3d [CVE-2009-0029] S... |
432 433 |
SYSCALL_DEFINE4(lgetxattr, const char __user *, pathname, const char __user *, name, void __user *, value, size_t, size) |
1da177e4c Linux-2.6.12-rc2 |
434 |
{ |
2d8f30380 [PATCH] sanitize ... |
435 |
struct path path; |
1da177e4c Linux-2.6.12-rc2 |
436 |
ssize_t error; |
2d8f30380 [PATCH] sanitize ... |
437 |
error = user_lpath(pathname, &path); |
1da177e4c Linux-2.6.12-rc2 |
438 439 |
if (error) return error; |
2d8f30380 [PATCH] sanitize ... |
440 441 |
error = getxattr(path.dentry, name, value, size); path_put(&path); |
1da177e4c Linux-2.6.12-rc2 |
442 443 |
return error; } |
64fd1de3d [CVE-2009-0029] S... |
444 445 |
SYSCALL_DEFINE4(fgetxattr, int, fd, const char __user *, name, void __user *, value, size_t, size) |
1da177e4c Linux-2.6.12-rc2 |
446 447 448 449 450 451 452 |
{ struct file *f; ssize_t error = -EBADF; f = fget(fd); if (!f) return error; |
5a190ae69 [PATCH] pass dent... |
453 |
audit_inode(NULL, f->f_path.dentry); |
0f7fc9e4d [PATCH] VFS: chan... |
454 |
error = getxattr(f->f_path.dentry, name, value, size); |
1da177e4c Linux-2.6.12-rc2 |
455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 |
fput(f); return error; } /* * Extended attribute LIST operations */ static ssize_t listxattr(struct dentry *d, char __user *list, size_t size) { ssize_t error; char *klist = NULL; if (size) { if (size > XATTR_LIST_MAX) size = XATTR_LIST_MAX; klist = kmalloc(size, GFP_KERNEL); if (!klist) return -ENOMEM; } |
659564c8a [PATCH] Introduce... |
475 |
error = vfs_listxattr(d, klist, size); |
f549d6c18 [PATCH] Generic V... |
476 477 478 479 480 481 482 |
if (error > 0) { if (size && copy_to_user(list, klist, error)) error = -EFAULT; } else if (error == -ERANGE && size >= XATTR_LIST_MAX) { /* The file system tried to returned a list bigger than XATTR_LIST_MAX bytes. Not possible. */ error = -E2BIG; |
1da177e4c Linux-2.6.12-rc2 |
483 |
} |
f99d49adf [PATCH] kfree cle... |
484 |
kfree(klist); |
1da177e4c Linux-2.6.12-rc2 |
485 486 |
return error; } |
64fd1de3d [CVE-2009-0029] S... |
487 488 |
SYSCALL_DEFINE3(listxattr, const char __user *, pathname, char __user *, list, size_t, size) |
1da177e4c Linux-2.6.12-rc2 |
489 |
{ |
2d8f30380 [PATCH] sanitize ... |
490 |
struct path path; |
1da177e4c Linux-2.6.12-rc2 |
491 |
ssize_t error; |
2d8f30380 [PATCH] sanitize ... |
492 |
error = user_path(pathname, &path); |
1da177e4c Linux-2.6.12-rc2 |
493 494 |
if (error) return error; |
2d8f30380 [PATCH] sanitize ... |
495 496 |
error = listxattr(path.dentry, list, size); path_put(&path); |
1da177e4c Linux-2.6.12-rc2 |
497 498 |
return error; } |
64fd1de3d [CVE-2009-0029] S... |
499 500 |
SYSCALL_DEFINE3(llistxattr, const char __user *, pathname, char __user *, list, size_t, size) |
1da177e4c Linux-2.6.12-rc2 |
501 |
{ |
2d8f30380 [PATCH] sanitize ... |
502 |
struct path path; |
1da177e4c Linux-2.6.12-rc2 |
503 |
ssize_t error; |
2d8f30380 [PATCH] sanitize ... |
504 |
error = user_lpath(pathname, &path); |
1da177e4c Linux-2.6.12-rc2 |
505 506 |
if (error) return error; |
2d8f30380 [PATCH] sanitize ... |
507 508 |
error = listxattr(path.dentry, list, size); path_put(&path); |
1da177e4c Linux-2.6.12-rc2 |
509 510 |
return error; } |
64fd1de3d [CVE-2009-0029] S... |
511 |
SYSCALL_DEFINE3(flistxattr, int, fd, char __user *, list, size_t, size) |
1da177e4c Linux-2.6.12-rc2 |
512 513 514 515 516 517 518 |
{ struct file *f; ssize_t error = -EBADF; f = fget(fd); if (!f) return error; |
5a190ae69 [PATCH] pass dent... |
519 |
audit_inode(NULL, f->f_path.dentry); |
0f7fc9e4d [PATCH] VFS: chan... |
520 |
error = listxattr(f->f_path.dentry, list, size); |
1da177e4c Linux-2.6.12-rc2 |
521 522 523 524 525 526 527 528 |
fput(f); return error; } /* * Extended attribute REMOVE operations */ static long |
8f0cfa52a xattr: add missin... |
529 |
removexattr(struct dentry *d, const char __user *name) |
1da177e4c Linux-2.6.12-rc2 |
530 531 532 533 534 535 536 537 538 |
{ int error; char kname[XATTR_NAME_MAX + 1]; error = strncpy_from_user(kname, name, sizeof(kname)); if (error == 0 || error == sizeof(kname)) error = -ERANGE; if (error < 0) return error; |
5be196e5f [PATCH] add vfs_*... |
539 |
return vfs_removexattr(d, kname); |
1da177e4c Linux-2.6.12-rc2 |
540 |
} |
64fd1de3d [CVE-2009-0029] S... |
541 542 |
SYSCALL_DEFINE2(removexattr, const char __user *, pathname, const char __user *, name) |
1da177e4c Linux-2.6.12-rc2 |
543 |
{ |
2d8f30380 [PATCH] sanitize ... |
544 |
struct path path; |
1da177e4c Linux-2.6.12-rc2 |
545 |
int error; |
2d8f30380 [PATCH] sanitize ... |
546 |
error = user_path(pathname, &path); |
1da177e4c Linux-2.6.12-rc2 |
547 548 |
if (error) return error; |
2d8f30380 [PATCH] sanitize ... |
549 |
error = mnt_want_write(path.mnt); |
18f335aff [PATCH] r/o bind ... |
550 |
if (!error) { |
2d8f30380 [PATCH] sanitize ... |
551 552 |
error = removexattr(path.dentry, name); mnt_drop_write(path.mnt); |
18f335aff [PATCH] r/o bind ... |
553 |
} |
2d8f30380 [PATCH] sanitize ... |
554 |
path_put(&path); |
1da177e4c Linux-2.6.12-rc2 |
555 556 |
return error; } |
6a6160a7b [CVE-2009-0029] S... |
557 558 |
SYSCALL_DEFINE2(lremovexattr, const char __user *, pathname, const char __user *, name) |
1da177e4c Linux-2.6.12-rc2 |
559 |
{ |
2d8f30380 [PATCH] sanitize ... |
560 |
struct path path; |
1da177e4c Linux-2.6.12-rc2 |
561 |
int error; |
2d8f30380 [PATCH] sanitize ... |
562 |
error = user_lpath(pathname, &path); |
1da177e4c Linux-2.6.12-rc2 |
563 564 |
if (error) return error; |
2d8f30380 [PATCH] sanitize ... |
565 |
error = mnt_want_write(path.mnt); |
18f335aff [PATCH] r/o bind ... |
566 |
if (!error) { |
2d8f30380 [PATCH] sanitize ... |
567 568 |
error = removexattr(path.dentry, name); mnt_drop_write(path.mnt); |
18f335aff [PATCH] r/o bind ... |
569 |
} |
2d8f30380 [PATCH] sanitize ... |
570 |
path_put(&path); |
1da177e4c Linux-2.6.12-rc2 |
571 572 |
return error; } |
6a6160a7b [CVE-2009-0029] S... |
573 |
SYSCALL_DEFINE2(fremovexattr, int, fd, const char __user *, name) |
1da177e4c Linux-2.6.12-rc2 |
574 575 |
{ struct file *f; |
73241ccca [PATCH] Collect m... |
576 |
struct dentry *dentry; |
1da177e4c Linux-2.6.12-rc2 |
577 578 579 580 581 |
int error = -EBADF; f = fget(fd); if (!f) return error; |
0f7fc9e4d [PATCH] VFS: chan... |
582 |
dentry = f->f_path.dentry; |
5a190ae69 [PATCH] pass dent... |
583 |
audit_inode(NULL, dentry); |
96029c4e0 fs: introduce mnt... |
584 |
error = mnt_want_write_file(f); |
18f335aff [PATCH] r/o bind ... |
585 586 587 588 |
if (!error) { error = removexattr(dentry, name); mnt_drop_write(f->f_path.mnt); } |
1da177e4c Linux-2.6.12-rc2 |
589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 |
fput(f); return error; } static const char * strcmp_prefix(const char *a, const char *a_prefix) { while (*a_prefix && *a == *a_prefix) { a++; a_prefix++; } return *a_prefix ? NULL : a; } /* * In order to implement different sets of xattr operations for each xattr * prefix with the generic xattr API, a filesystem should create a * null-terminated array of struct xattr_handler (one for each prefix) and * hang a pointer to it off of the s_xattr field of the superblock. * * The generic_fooxattr() functions will use this list to dispatch xattr * operations to the correct xattr_handler. */ #define for_each_xattr_handler(handlers, handler) \ for ((handler) = *(handlers)++; \ (handler) != NULL; \ (handler) = *(handlers)++) /* * Find the xattr_handler with the matching prefix. */ |
bb4354538 fs: xattr_handler... |
621 622 |
static const struct xattr_handler * xattr_resolve_name(const struct xattr_handler **handlers, const char **name) |
1da177e4c Linux-2.6.12-rc2 |
623 |
{ |
bb4354538 fs: xattr_handler... |
624 |
const struct xattr_handler *handler; |
1da177e4c Linux-2.6.12-rc2 |
625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 |
if (!*name) return NULL; for_each_xattr_handler(handlers, handler) { const char *n = strcmp_prefix(*name, handler->prefix); if (n) { *name = n; break; } } return handler; } /* * Find the handler for the prefix and dispatch its get() operation. */ ssize_t generic_getxattr(struct dentry *dentry, const char *name, void *buffer, size_t size) { |
bb4354538 fs: xattr_handler... |
645 |
const struct xattr_handler *handler; |
1da177e4c Linux-2.6.12-rc2 |
646 |
|
431547b3c sanitize xattr ha... |
647 |
handler = xattr_resolve_name(dentry->d_sb->s_xattr, &name); |
1da177e4c Linux-2.6.12-rc2 |
648 649 |
if (!handler) return -EOPNOTSUPP; |
431547b3c sanitize xattr ha... |
650 |
return handler->get(dentry, name, buffer, size, handler->flags); |
1da177e4c Linux-2.6.12-rc2 |
651 652 653 654 655 656 657 658 659 |
} /* * Combine the results of the list() operation from every xattr_handler in the * list. */ ssize_t generic_listxattr(struct dentry *dentry, char *buffer, size_t buffer_size) { |
bb4354538 fs: xattr_handler... |
660 |
const struct xattr_handler *handler, **handlers = dentry->d_sb->s_xattr; |
1da177e4c Linux-2.6.12-rc2 |
661 662 663 |
unsigned int size = 0; if (!buffer) { |
431547b3c sanitize xattr ha... |
664 665 666 667 |
for_each_xattr_handler(handlers, handler) { size += handler->list(dentry, NULL, 0, NULL, 0, handler->flags); } |
1da177e4c Linux-2.6.12-rc2 |
668 669 670 671 |
} else { char *buf = buffer; for_each_xattr_handler(handlers, handler) { |
431547b3c sanitize xattr ha... |
672 673 |
size = handler->list(dentry, buf, buffer_size, NULL, 0, handler->flags); |
1da177e4c Linux-2.6.12-rc2 |
674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 |
if (size > buffer_size) return -ERANGE; buf += size; buffer_size -= size; } size = buf - buffer; } return size; } /* * Find the handler for the prefix and dispatch its set() operation. */ int generic_setxattr(struct dentry *dentry, const char *name, const void *value, size_t size, int flags) { |
bb4354538 fs: xattr_handler... |
690 |
const struct xattr_handler *handler; |
1da177e4c Linux-2.6.12-rc2 |
691 692 693 |
if (size == 0) value = ""; /* empty EA, do not remove */ |
431547b3c sanitize xattr ha... |
694 |
handler = xattr_resolve_name(dentry->d_sb->s_xattr, &name); |
1da177e4c Linux-2.6.12-rc2 |
695 696 |
if (!handler) return -EOPNOTSUPP; |
df7e13038 vfs: Pass setxatt... |
697 |
return handler->set(dentry, name, value, size, flags, handler->flags); |
1da177e4c Linux-2.6.12-rc2 |
698 699 700 701 702 703 704 705 706 |
} /* * Find the handler for the prefix and dispatch its set() operation to remove * any associated extended attribute. */ int generic_removexattr(struct dentry *dentry, const char *name) { |
bb4354538 fs: xattr_handler... |
707 |
const struct xattr_handler *handler; |
1da177e4c Linux-2.6.12-rc2 |
708 |
|
431547b3c sanitize xattr ha... |
709 |
handler = xattr_resolve_name(dentry->d_sb->s_xattr, &name); |
1da177e4c Linux-2.6.12-rc2 |
710 711 |
if (!handler) return -EOPNOTSUPP; |
431547b3c sanitize xattr ha... |
712 713 |
return handler->set(dentry, name, NULL, 0, XATTR_REPLACE, handler->flags); |
1da177e4c Linux-2.6.12-rc2 |
714 715 716 717 718 719 |
} EXPORT_SYMBOL(generic_getxattr); EXPORT_SYMBOL(generic_listxattr); EXPORT_SYMBOL(generic_setxattr); EXPORT_SYMBOL(generic_removexattr); |