4 Extended attribute handling.
6 Copyright (C) 2001 by Andreas Gruenbacher <a.gruenbacher@computer.org>
7 Copyright (C) 2001 SGI - Silicon Graphics, Inc <linux-xfs@oss.sgi.com>
8 Copyright (c) 2004 Red Hat, Inc., James Morris <jmorris@redhat.com>
11 #include <linux/slab.h>
12 #include <linux/file.h>
13 #include <linux/xattr.h>
14 #include <linux/mount.h>
15 #include <linux/namei.h>
16 #include <linux/security.h>
17 #include <linux/evm.h>
18 #include <linux/syscalls.h>
19 #include <linux/export.h>
20 #include <linux/fsnotify.h>
21 #include <linux/audit.h>
22 #include <linux/vmalloc.h>
23 #include <linux/posix_acl_xattr.h>
25 #include <linux/uaccess.h>
29 strcmp_prefix(const char *a
, const char *a_prefix
)
31 while (*a_prefix
&& *a
== *a_prefix
) {
35 return *a_prefix
? NULL
: a
;
39 * In order to implement different sets of xattr operations for each xattr
40 * prefix, a filesystem should create a null-terminated array of struct
41 * xattr_handler (one for each prefix) and hang a pointer to it off of the
42 * s_xattr field of the superblock.
44 #define for_each_xattr_handler(handlers, handler) \
46 for ((handler) = *(handlers)++; \
48 (handler) = *(handlers)++)
51 * Find the xattr_handler with the matching prefix.
53 static const struct xattr_handler
*
54 xattr_resolve_name(struct inode
*inode
, const char **name
)
56 const struct xattr_handler
**handlers
= inode
->i_sb
->s_xattr
;
57 const struct xattr_handler
*handler
;
59 if (!(inode
->i_opflags
& IOP_XATTR
)) {
60 if (unlikely(is_bad_inode(inode
)))
62 return ERR_PTR(-EOPNOTSUPP
);
64 for_each_xattr_handler(handlers
, handler
) {
67 n
= strcmp_prefix(*name
, xattr_prefix(handler
));
69 if (!handler
->prefix
^ !*n
) {
72 return ERR_PTR(-EINVAL
);
78 return ERR_PTR(-EOPNOTSUPP
);
82 * Check permissions for extended attribute access. This is a bit complicated
83 * because different namespaces have very different rules.
86 xattr_permission(struct inode
*inode
, const char *name
, int mask
)
89 * We can never set or remove an extended attribute on a read-only
90 * filesystem or on an immutable / append-only inode.
92 if (mask
& MAY_WRITE
) {
93 if (IS_IMMUTABLE(inode
) || IS_APPEND(inode
))
96 * Updating an xattr will likely cause i_uid and i_gid
97 * to be writen back improperly if their true value is
100 if (HAS_UNMAPPED_ID(inode
))
105 * No restriction for security.* and system.* from the VFS. Decision
106 * on these is left to the underlying filesystem / security module.
108 if (!strncmp(name
, XATTR_SECURITY_PREFIX
, XATTR_SECURITY_PREFIX_LEN
) ||
109 !strncmp(name
, XATTR_SYSTEM_PREFIX
, XATTR_SYSTEM_PREFIX_LEN
))
113 * The trusted.* namespace can only be accessed by privileged users.
115 if (!strncmp(name
, XATTR_TRUSTED_PREFIX
, XATTR_TRUSTED_PREFIX_LEN
)) {
116 if (!capable(CAP_SYS_ADMIN
))
117 return (mask
& MAY_WRITE
) ? -EPERM
: -ENODATA
;
122 * In the user.* namespace, only regular files and directories can have
123 * extended attributes. For sticky directories, only the owner and
124 * privileged users can write attributes.
126 if (!strncmp(name
, XATTR_USER_PREFIX
, XATTR_USER_PREFIX_LEN
)) {
127 if (!S_ISREG(inode
->i_mode
) && !S_ISDIR(inode
->i_mode
))
128 return (mask
& MAY_WRITE
) ? -EPERM
: -ENODATA
;
129 if (S_ISDIR(inode
->i_mode
) && (inode
->i_mode
& S_ISVTX
) &&
130 (mask
& MAY_WRITE
) && !inode_owner_or_capable(inode
))
134 return inode_permission(inode
, mask
);
138 __vfs_setxattr(struct dentry
*dentry
, struct inode
*inode
, const char *name
,
139 const void *value
, size_t size
, int flags
)
141 const struct xattr_handler
*handler
;
143 handler
= xattr_resolve_name(inode
, &name
);
145 return PTR_ERR(handler
);
149 value
= ""; /* empty EA, do not remove */
150 return handler
->set(handler
, dentry
, inode
, name
, value
, size
, flags
);
152 EXPORT_SYMBOL(__vfs_setxattr
);
155 * __vfs_setxattr_noperm - perform setxattr operation without performing
158 * @dentry - object to perform setxattr on
159 * @name - xattr name to set
160 * @value - value to set @name to
161 * @size - size of @value
162 * @flags - flags to pass into filesystem operations
164 * returns the result of the internal setxattr or setsecurity operations.
166 * This function requires the caller to lock the inode's i_mutex before it
167 * is executed. It also assumes that the caller will make the appropriate
170 int __vfs_setxattr_noperm(struct dentry
*dentry
, const char *name
,
171 const void *value
, size_t size
, int flags
)
173 struct inode
*inode
= dentry
->d_inode
;
175 int issec
= !strncmp(name
, XATTR_SECURITY_PREFIX
,
176 XATTR_SECURITY_PREFIX_LEN
);
179 inode
->i_flags
&= ~S_NOSEC
;
180 if (inode
->i_opflags
& IOP_XATTR
) {
181 error
= __vfs_setxattr(dentry
, inode
, name
, value
, size
, flags
);
183 fsnotify_xattr(dentry
);
184 security_inode_post_setxattr(dentry
, name
, value
,
188 if (unlikely(is_bad_inode(inode
)))
191 if (error
== -EAGAIN
) {
195 const char *suffix
= name
+ XATTR_SECURITY_PREFIX_LEN
;
197 error
= security_inode_setsecurity(inode
, suffix
, value
,
200 fsnotify_xattr(dentry
);
206 EXPORT_SYMBOL_GPL(__vfs_setxattr_noperm
);
210 vfs_setxattr(struct dentry
*dentry
, const char *name
, const void *value
,
211 size_t size
, int flags
)
213 struct inode
*inode
= dentry
->d_inode
;
216 error
= xattr_permission(inode
, name
, MAY_WRITE
);
221 error
= security_inode_setxattr(dentry
, name
, value
, size
, flags
);
225 error
= __vfs_setxattr_noperm(dentry
, name
, value
, size
, flags
);
231 EXPORT_SYMBOL_GPL(vfs_setxattr
);
234 xattr_getsecurity(struct inode
*inode
, const char *name
, void *value
,
240 if (!value
|| !size
) {
241 len
= security_inode_getsecurity(inode
, name
, &buffer
, false);
245 len
= security_inode_getsecurity(inode
, name
, &buffer
, true);
252 memcpy(value
, buffer
, len
);
258 EXPORT_SYMBOL_GPL(xattr_getsecurity
);
261 * vfs_getxattr_alloc - allocate memory, if necessary, before calling getxattr
263 * Allocate memory, if not already allocated, or re-allocate correct size,
264 * before retrieving the extended attribute.
266 * Returns the result of alloc, if failed, or the getxattr operation.
269 vfs_getxattr_alloc(struct dentry
*dentry
, const char *name
, char **xattr_value
,
270 size_t xattr_size
, gfp_t flags
)
272 const struct xattr_handler
*handler
;
273 struct inode
*inode
= dentry
->d_inode
;
274 char *value
= *xattr_value
;
277 error
= xattr_permission(inode
, name
, MAY_READ
);
281 handler
= xattr_resolve_name(inode
, &name
);
283 return PTR_ERR(handler
);
286 error
= handler
->get(handler
, dentry
, inode
, name
, NULL
, 0);
290 if (!value
|| (error
> xattr_size
)) {
291 value
= krealloc(*xattr_value
, error
+ 1, flags
);
294 memset(value
, 0, error
+ 1);
297 error
= handler
->get(handler
, dentry
, inode
, name
, value
, error
);
298 *xattr_value
= value
;
301 EXPORT_SYMBOL_GPL(vfs_getxattr_alloc
);
304 __vfs_getxattr(struct dentry
*dentry
, struct inode
*inode
, const char *name
,
305 void *value
, size_t size
)
307 const struct xattr_handler
*handler
;
309 handler
= xattr_resolve_name(inode
, &name
);
311 return PTR_ERR(handler
);
314 return handler
->get(handler
, dentry
, inode
, name
, value
, size
);
316 EXPORT_SYMBOL(__vfs_getxattr
);
319 vfs_getxattr(struct dentry
*dentry
, const char *name
, void *value
, size_t size
)
321 struct inode
*inode
= dentry
->d_inode
;
324 error
= xattr_permission(inode
, name
, MAY_READ
);
328 error
= security_inode_getxattr(dentry
, name
);
332 if (!strncmp(name
, XATTR_SECURITY_PREFIX
,
333 XATTR_SECURITY_PREFIX_LEN
)) {
334 const char *suffix
= name
+ XATTR_SECURITY_PREFIX_LEN
;
335 int ret
= xattr_getsecurity(inode
, suffix
, value
, size
);
337 * Only overwrite the return value if a security module
338 * is actually active.
340 if (ret
== -EOPNOTSUPP
)
345 return __vfs_getxattr(dentry
, inode
, name
, value
, size
);
347 EXPORT_SYMBOL_GPL(vfs_getxattr
);
350 vfs_listxattr(struct dentry
*dentry
, char *list
, size_t size
)
352 struct inode
*inode
= d_inode(dentry
);
355 error
= security_inode_listxattr(dentry
);
358 if (inode
->i_op
->listxattr
&& (inode
->i_opflags
& IOP_XATTR
)) {
360 error
= inode
->i_op
->listxattr(dentry
, list
, size
);
362 error
= security_inode_listsecurity(inode
, list
, size
);
363 if (size
&& error
> size
)
368 EXPORT_SYMBOL_GPL(vfs_listxattr
);
371 __vfs_removexattr(struct dentry
*dentry
, const char *name
)
373 struct inode
*inode
= d_inode(dentry
);
374 const struct xattr_handler
*handler
;
376 handler
= xattr_resolve_name(inode
, &name
);
378 return PTR_ERR(handler
);
381 return handler
->set(handler
, dentry
, inode
, name
, NULL
, 0, XATTR_REPLACE
);
383 EXPORT_SYMBOL(__vfs_removexattr
);
386 * __vfs_removexattr_noperm - perform removexattr operation without
387 * performing permission checks.
389 * @dentry - object to perform setxattr on
390 * @name - xattr name to set
392 * returns the result of the internal setxattr or setsecurity operations.
394 * This function requires the caller to lock the inode's i_mutex before it
395 * is executed. It also assumes that the caller will make the appropriate
399 __vfs_removexattr_noperm(struct dentry
*dentry
, const char *name
)
403 error
=__vfs_removexattr(dentry
, name
);
405 fsnotify_xattr(dentry
);
406 evm_inode_post_removexattr(dentry
, name
);
410 EXPORT_SYMBOL_GPL(__vfs_removexattr_noperm
);
413 vfs_removexattr(struct dentry
*dentry
, const char *name
)
415 struct inode
*inode
= dentry
->d_inode
;
418 error
= xattr_permission(inode
, name
, MAY_WRITE
);
423 error
= security_inode_removexattr(dentry
, name
);
427 error
= __vfs_removexattr_noperm(dentry
, name
);
433 EXPORT_SYMBOL_GPL(vfs_removexattr
);
437 * Extended attribute SET operations
440 setxattr(struct dentry
*d
, const char __user
*name
, const void __user
*value
,
441 size_t size
, int flags
)
445 char kname
[XATTR_NAME_MAX
+ 1];
447 if (flags
& ~(XATTR_CREATE
|XATTR_REPLACE
))
450 error
= strncpy_from_user(kname
, name
, sizeof(kname
));
451 if (error
== 0 || error
== sizeof(kname
))
457 if (size
> XATTR_SIZE_MAX
)
459 kvalue
= kvmalloc(size
, GFP_KERNEL
);
462 if (copy_from_user(kvalue
, value
, size
)) {
466 if ((strcmp(kname
, XATTR_NAME_POSIX_ACL_ACCESS
) == 0) ||
467 (strcmp(kname
, XATTR_NAME_POSIX_ACL_DEFAULT
) == 0))
468 posix_acl_fix_xattr_from_user(kvalue
, size
);
469 else if (strcmp(kname
, XATTR_NAME_CAPS
) == 0) {
470 error
= cap_convert_nscap(d
, &kvalue
, size
);
477 error
= vfs_setxattr(d
, kname
, kvalue
, size
, flags
);
484 static int path_setxattr(const char __user
*pathname
,
485 const char __user
*name
, const void __user
*value
,
486 size_t size
, int flags
, unsigned int lookup_flags
)
491 error
= user_path_at(AT_FDCWD
, pathname
, lookup_flags
, &path
);
494 error
= mnt_want_write(path
.mnt
);
496 error
= setxattr(path
.dentry
, name
, value
, size
, flags
);
497 mnt_drop_write(path
.mnt
);
500 if (retry_estale(error
, lookup_flags
)) {
501 lookup_flags
|= LOOKUP_REVAL
;
507 SYSCALL_DEFINE5(setxattr
, const char __user
*, pathname
,
508 const char __user
*, name
, const void __user
*, value
,
509 size_t, size
, int, flags
)
511 return path_setxattr(pathname
, name
, value
, size
, flags
, LOOKUP_FOLLOW
);
514 SYSCALL_DEFINE5(lsetxattr
, const char __user
*, pathname
,
515 const char __user
*, name
, const void __user
*, value
,
516 size_t, size
, int, flags
)
518 return path_setxattr(pathname
, name
, value
, size
, flags
, 0);
521 SYSCALL_DEFINE5(fsetxattr
, int, fd
, const char __user
*, name
,
522 const void __user
*,value
, size_t, size
, int, flags
)
524 struct fd f
= fdget(fd
);
530 error
= mnt_want_write_file_path(f
.file
);
532 error
= setxattr(f
.file
->f_path
.dentry
, name
, value
, size
, flags
);
533 mnt_drop_write_file_path(f
.file
);
540 * Extended attribute GET operations
543 getxattr(struct dentry
*d
, const char __user
*name
, void __user
*value
,
548 char kname
[XATTR_NAME_MAX
+ 1];
550 error
= strncpy_from_user(kname
, name
, sizeof(kname
));
551 if (error
== 0 || error
== sizeof(kname
))
557 if (size
> XATTR_SIZE_MAX
)
558 size
= XATTR_SIZE_MAX
;
559 kvalue
= kvzalloc(size
, GFP_KERNEL
);
564 error
= vfs_getxattr(d
, kname
, kvalue
, size
);
566 if ((strcmp(kname
, XATTR_NAME_POSIX_ACL_ACCESS
) == 0) ||
567 (strcmp(kname
, XATTR_NAME_POSIX_ACL_DEFAULT
) == 0))
568 posix_acl_fix_xattr_to_user(kvalue
, size
);
569 if (size
&& copy_to_user(value
, kvalue
, error
))
571 } else if (error
== -ERANGE
&& size
>= XATTR_SIZE_MAX
) {
572 /* The file system tried to returned a value bigger
573 than XATTR_SIZE_MAX bytes. Not possible. */
582 static ssize_t
path_getxattr(const char __user
*pathname
,
583 const char __user
*name
, void __user
*value
,
584 size_t size
, unsigned int lookup_flags
)
589 error
= user_path_at(AT_FDCWD
, pathname
, lookup_flags
, &path
);
592 error
= getxattr(path
.dentry
, name
, value
, size
);
594 if (retry_estale(error
, lookup_flags
)) {
595 lookup_flags
|= LOOKUP_REVAL
;
601 SYSCALL_DEFINE4(getxattr
, const char __user
*, pathname
,
602 const char __user
*, name
, void __user
*, value
, size_t, size
)
604 return path_getxattr(pathname
, name
, value
, size
, LOOKUP_FOLLOW
);
607 SYSCALL_DEFINE4(lgetxattr
, const char __user
*, pathname
,
608 const char __user
*, name
, void __user
*, value
, size_t, size
)
610 return path_getxattr(pathname
, name
, value
, size
, 0);
613 SYSCALL_DEFINE4(fgetxattr
, int, fd
, const char __user
*, name
,
614 void __user
*, value
, size_t, size
)
616 struct fd f
= fdget(fd
);
617 ssize_t error
= -EBADF
;
622 error
= getxattr(f
.file
->f_path
.dentry
, name
, value
, size
);
628 * Extended attribute LIST operations
631 listxattr(struct dentry
*d
, char __user
*list
, size_t size
)
637 if (size
> XATTR_LIST_MAX
)
638 size
= XATTR_LIST_MAX
;
639 klist
= kvmalloc(size
, GFP_KERNEL
);
644 error
= vfs_listxattr(d
, klist
, size
);
646 if (size
&& copy_to_user(list
, klist
, error
))
648 } else if (error
== -ERANGE
&& size
>= XATTR_LIST_MAX
) {
649 /* The file system tried to returned a list bigger
650 than XATTR_LIST_MAX bytes. Not possible. */
659 static ssize_t
path_listxattr(const char __user
*pathname
, char __user
*list
,
660 size_t size
, unsigned int lookup_flags
)
665 error
= user_path_at(AT_FDCWD
, pathname
, lookup_flags
, &path
);
668 error
= listxattr(path
.dentry
, list
, size
);
670 if (retry_estale(error
, lookup_flags
)) {
671 lookup_flags
|= LOOKUP_REVAL
;
677 SYSCALL_DEFINE3(listxattr
, const char __user
*, pathname
, char __user
*, list
,
680 return path_listxattr(pathname
, list
, size
, LOOKUP_FOLLOW
);
683 SYSCALL_DEFINE3(llistxattr
, const char __user
*, pathname
, char __user
*, list
,
686 return path_listxattr(pathname
, list
, size
, 0);
689 SYSCALL_DEFINE3(flistxattr
, int, fd
, char __user
*, list
, size_t, size
)
691 struct fd f
= fdget(fd
);
692 ssize_t error
= -EBADF
;
697 error
= listxattr(f
.file
->f_path
.dentry
, list
, size
);
703 * Extended attribute REMOVE operations
706 removexattr(struct dentry
*d
, const char __user
*name
)
709 char kname
[XATTR_NAME_MAX
+ 1];
711 error
= strncpy_from_user(kname
, name
, sizeof(kname
));
712 if (error
== 0 || error
== sizeof(kname
))
717 return vfs_removexattr(d
, kname
);
720 static int path_removexattr(const char __user
*pathname
,
721 const char __user
*name
, unsigned int lookup_flags
)
726 error
= user_path_at(AT_FDCWD
, pathname
, lookup_flags
, &path
);
729 error
= mnt_want_write(path
.mnt
);
731 error
= removexattr(path
.dentry
, name
);
732 mnt_drop_write(path
.mnt
);
735 if (retry_estale(error
, lookup_flags
)) {
736 lookup_flags
|= LOOKUP_REVAL
;
742 SYSCALL_DEFINE2(removexattr
, const char __user
*, pathname
,
743 const char __user
*, name
)
745 return path_removexattr(pathname
, name
, LOOKUP_FOLLOW
);
748 SYSCALL_DEFINE2(lremovexattr
, const char __user
*, pathname
,
749 const char __user
*, name
)
751 return path_removexattr(pathname
, name
, 0);
754 SYSCALL_DEFINE2(fremovexattr
, int, fd
, const char __user
*, name
)
756 struct fd f
= fdget(fd
);
762 error
= mnt_want_write_file_path(f
.file
);
764 error
= removexattr(f
.file
->f_path
.dentry
, name
);
765 mnt_drop_write_file_path(f
.file
);
772 * Combine the results of the list() operation from every xattr_handler in the
776 generic_listxattr(struct dentry
*dentry
, char *buffer
, size_t buffer_size
)
778 const struct xattr_handler
*handler
, **handlers
= dentry
->d_sb
->s_xattr
;
779 unsigned int size
= 0;
782 for_each_xattr_handler(handlers
, handler
) {
783 if (!handler
->name
||
784 (handler
->list
&& !handler
->list(dentry
)))
786 size
+= strlen(handler
->name
) + 1;
792 for_each_xattr_handler(handlers
, handler
) {
793 if (!handler
->name
||
794 (handler
->list
&& !handler
->list(dentry
)))
796 len
= strlen(handler
->name
);
797 if (len
+ 1 > buffer_size
)
799 memcpy(buf
, handler
->name
, len
+ 1);
801 buffer_size
-= len
+ 1;
807 EXPORT_SYMBOL(generic_listxattr
);
810 * xattr_full_name - Compute full attribute name from suffix
812 * @handler: handler of the xattr_handler operation
813 * @name: name passed to the xattr_handler operation
815 * The get and set xattr handler operations are called with the remainder of
816 * the attribute name after skipping the handler's prefix: for example, "foo"
817 * is passed to the get operation of a handler with prefix "user." to get
818 * attribute "user.foo". The full name is still "there" in the name though.
820 * Note: the list xattr handler operation when called from the vfs is passed a
821 * NULL name; some file systems use this operation internally, with varying
824 const char *xattr_full_name(const struct xattr_handler
*handler
,
827 size_t prefix_len
= strlen(xattr_prefix(handler
));
829 return name
- prefix_len
;
831 EXPORT_SYMBOL(xattr_full_name
);
834 * Allocate new xattr and copy in the value; but leave the name to callers.
836 struct simple_xattr
*simple_xattr_alloc(const void *value
, size_t size
)
838 struct simple_xattr
*new_xattr
;
842 len
= sizeof(*new_xattr
) + size
;
843 if (len
< sizeof(*new_xattr
))
846 new_xattr
= kmalloc(len
, GFP_KERNEL
);
850 new_xattr
->size
= size
;
851 memcpy(new_xattr
->value
, value
, size
);
856 * xattr GET operation for in-memory/pseudo filesystems
858 int simple_xattr_get(struct simple_xattrs
*xattrs
, const char *name
,
859 void *buffer
, size_t size
)
861 struct simple_xattr
*xattr
;
864 spin_lock(&xattrs
->lock
);
865 list_for_each_entry(xattr
, &xattrs
->head
, list
) {
866 if (strcmp(name
, xattr
->name
))
871 if (size
< xattr
->size
)
874 memcpy(buffer
, xattr
->value
, xattr
->size
);
878 spin_unlock(&xattrs
->lock
);
883 * simple_xattr_set - xattr SET operation for in-memory/pseudo filesystems
884 * @xattrs: target simple_xattr list
885 * @name: name of the extended attribute
886 * @value: value of the xattr. If %NULL, will remove the attribute.
887 * @size: size of the new xattr
888 * @flags: %XATTR_{CREATE|REPLACE}
890 * %XATTR_CREATE is set, the xattr shouldn't exist already; otherwise fails
891 * with -EEXIST. If %XATTR_REPLACE is set, the xattr should exist;
892 * otherwise, fails with -ENODATA.
894 * Returns 0 on success, -errno on failure.
896 int simple_xattr_set(struct simple_xattrs
*xattrs
, const char *name
,
897 const void *value
, size_t size
, int flags
)
899 struct simple_xattr
*xattr
;
900 struct simple_xattr
*new_xattr
= NULL
;
903 /* value == NULL means remove */
905 new_xattr
= simple_xattr_alloc(value
, size
);
909 new_xattr
->name
= kstrdup(name
, GFP_KERNEL
);
910 if (!new_xattr
->name
) {
916 spin_lock(&xattrs
->lock
);
917 list_for_each_entry(xattr
, &xattrs
->head
, list
) {
918 if (!strcmp(name
, xattr
->name
)) {
919 if (flags
& XATTR_CREATE
) {
922 } else if (new_xattr
) {
923 list_replace(&xattr
->list
, &new_xattr
->list
);
925 list_del(&xattr
->list
);
930 if (flags
& XATTR_REPLACE
) {
934 list_add(&new_xattr
->list
, &xattrs
->head
);
938 spin_unlock(&xattrs
->lock
);
947 static bool xattr_is_trusted(const char *name
)
949 return !strncmp(name
, XATTR_TRUSTED_PREFIX
, XATTR_TRUSTED_PREFIX_LEN
);
952 static int xattr_list_one(char **buffer
, ssize_t
*remaining_size
,
955 size_t len
= strlen(name
) + 1;
957 if (*remaining_size
< len
)
959 memcpy(*buffer
, name
, len
);
962 *remaining_size
-= len
;
967 * xattr LIST operation for in-memory/pseudo filesystems
969 ssize_t
simple_xattr_list(struct inode
*inode
, struct simple_xattrs
*xattrs
,
970 char *buffer
, size_t size
)
972 bool trusted
= capable(CAP_SYS_ADMIN
);
973 struct simple_xattr
*xattr
;
974 ssize_t remaining_size
= size
;
977 #ifdef CONFIG_FS_POSIX_ACL
979 err
= xattr_list_one(&buffer
, &remaining_size
,
980 XATTR_NAME_POSIX_ACL_ACCESS
);
984 if (inode
->i_default_acl
) {
985 err
= xattr_list_one(&buffer
, &remaining_size
,
986 XATTR_NAME_POSIX_ACL_DEFAULT
);
992 spin_lock(&xattrs
->lock
);
993 list_for_each_entry(xattr
, &xattrs
->head
, list
) {
994 /* skip "trusted." attributes for unprivileged callers */
995 if (!trusted
&& xattr_is_trusted(xattr
->name
))
998 err
= xattr_list_one(&buffer
, &remaining_size
, xattr
->name
);
1002 spin_unlock(&xattrs
->lock
);
1004 return err
? err
: size
- remaining_size
;
1008 * Adds an extended attribute to the list
1010 void simple_xattr_list_add(struct simple_xattrs
*xattrs
,
1011 struct simple_xattr
*new_xattr
)
1013 spin_lock(&xattrs
->lock
);
1014 list_add(&new_xattr
->list
, &xattrs
->head
);
1015 spin_unlock(&xattrs
->lock
);