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 <asm/uaccess.h>
28 strcmp_prefix(const char *a
, const char *a_prefix
)
30 while (*a_prefix
&& *a
== *a_prefix
) {
34 return *a_prefix
? NULL
: a
;
38 * In order to implement different sets of xattr operations for each xattr
39 * prefix with the generic xattr API, a filesystem should create a
40 * null-terminated array of struct xattr_handler (one for each prefix) and
41 * hang a pointer to it off of the s_xattr field of the superblock.
43 * The generic_fooxattr() functions will use this list to dispatch xattr
44 * operations to the correct xattr_handler.
46 #define for_each_xattr_handler(handlers, handler) \
48 for ((handler) = *(handlers)++; \
50 (handler) = *(handlers)++)
53 * Find the xattr_handler with the matching prefix.
55 static const struct xattr_handler
*
56 xattr_resolve_name(struct inode
*inode
, const char **name
)
58 const struct xattr_handler
**handlers
= inode
->i_sb
->s_xattr
;
59 const struct xattr_handler
*handler
;
61 if (!(inode
->i_opflags
& IOP_XATTR
)) {
62 if (unlikely(is_bad_inode(inode
)))
64 return ERR_PTR(-EOPNOTSUPP
);
66 for_each_xattr_handler(handlers
, handler
) {
69 n
= strcmp_prefix(*name
, xattr_prefix(handler
));
71 if (!handler
->prefix
^ !*n
) {
74 return ERR_PTR(-EINVAL
);
80 return ERR_PTR(-EOPNOTSUPP
);
84 * Check permissions for extended attribute access. This is a bit complicated
85 * because different namespaces have very different rules.
88 xattr_permission(struct inode
*inode
, const char *name
, int mask
)
91 * We can never set or remove an extended attribute on a read-only
92 * filesystem or on an immutable / append-only inode.
94 if (mask
& MAY_WRITE
) {
95 if (IS_IMMUTABLE(inode
) || IS_APPEND(inode
))
98 * Updating an xattr will likely cause i_uid and i_gid
99 * to be writen back improperly if their true value is
100 * unknown to the vfs.
102 if (HAS_UNMAPPED_ID(inode
))
107 * No restriction for security.* and system.* from the VFS. Decision
108 * on these is left to the underlying filesystem / security module.
110 if (!strncmp(name
, XATTR_SECURITY_PREFIX
, XATTR_SECURITY_PREFIX_LEN
) ||
111 !strncmp(name
, XATTR_SYSTEM_PREFIX
, XATTR_SYSTEM_PREFIX_LEN
))
115 * The trusted.* namespace can only be accessed by privileged users.
117 if (!strncmp(name
, XATTR_TRUSTED_PREFIX
, XATTR_TRUSTED_PREFIX_LEN
)) {
118 if (!capable(CAP_SYS_ADMIN
))
119 return (mask
& MAY_WRITE
) ? -EPERM
: -ENODATA
;
124 * In the user.* namespace, only regular files and directories can have
125 * extended attributes. For sticky directories, only the owner and
126 * privileged users can write attributes.
128 if (!strncmp(name
, XATTR_USER_PREFIX
, XATTR_USER_PREFIX_LEN
)) {
129 if (!S_ISREG(inode
->i_mode
) && !S_ISDIR(inode
->i_mode
))
130 return (mask
& MAY_WRITE
) ? -EPERM
: -ENODATA
;
131 if (S_ISDIR(inode
->i_mode
) && (inode
->i_mode
& S_ISVTX
) &&
132 (mask
& MAY_WRITE
) && !inode_owner_or_capable(inode
))
136 return inode_permission(inode
, mask
);
140 * __vfs_setxattr_noperm - perform setxattr operation without performing
143 * @dentry - object to perform setxattr on
144 * @name - xattr name to set
145 * @value - value to set @name to
146 * @size - size of @value
147 * @flags - flags to pass into filesystem operations
149 * returns the result of the internal setxattr or setsecurity operations.
151 * This function requires the caller to lock the inode's i_mutex before it
152 * is executed. It also assumes that the caller will make the appropriate
155 int __vfs_setxattr_noperm(struct dentry
*dentry
, const char *name
,
156 const void *value
, size_t size
, int flags
)
158 struct inode
*inode
= dentry
->d_inode
;
159 int error
= -EOPNOTSUPP
;
160 int issec
= !strncmp(name
, XATTR_SECURITY_PREFIX
,
161 XATTR_SECURITY_PREFIX_LEN
);
164 inode
->i_flags
&= ~S_NOSEC
;
165 if (inode
->i_op
->setxattr
) {
166 error
= inode
->i_op
->setxattr(dentry
, inode
, name
, value
, size
, flags
);
168 fsnotify_xattr(dentry
);
169 security_inode_post_setxattr(dentry
, name
, value
,
173 const char *suffix
= name
+ XATTR_SECURITY_PREFIX_LEN
;
175 if (unlikely(is_bad_inode(inode
)))
177 error
= security_inode_setsecurity(inode
, suffix
, value
,
180 fsnotify_xattr(dentry
);
188 vfs_setxattr(struct dentry
*dentry
, const char *name
, const void *value
,
189 size_t size
, int flags
)
191 struct inode
*inode
= dentry
->d_inode
;
194 error
= xattr_permission(inode
, name
, MAY_WRITE
);
199 error
= security_inode_setxattr(dentry
, name
, value
, size
, flags
);
203 error
= __vfs_setxattr_noperm(dentry
, name
, value
, size
, flags
);
209 EXPORT_SYMBOL_GPL(vfs_setxattr
);
212 xattr_getsecurity(struct inode
*inode
, const char *name
, void *value
,
218 if (!value
|| !size
) {
219 len
= security_inode_getsecurity(inode
, name
, &buffer
, false);
223 len
= security_inode_getsecurity(inode
, name
, &buffer
, true);
230 memcpy(value
, buffer
, len
);
232 security_release_secctx(buffer
, len
);
236 EXPORT_SYMBOL_GPL(xattr_getsecurity
);
239 * vfs_getxattr_alloc - allocate memory, if necessary, before calling getxattr
241 * Allocate memory, if not already allocated, or re-allocate correct size,
242 * before retrieving the extended attribute.
244 * Returns the result of alloc, if failed, or the getxattr operation.
247 vfs_getxattr_alloc(struct dentry
*dentry
, const char *name
, char **xattr_value
,
248 size_t xattr_size
, gfp_t flags
)
250 struct inode
*inode
= dentry
->d_inode
;
251 char *value
= *xattr_value
;
254 error
= xattr_permission(inode
, name
, MAY_READ
);
258 if (!inode
->i_op
->getxattr
)
261 error
= inode
->i_op
->getxattr(dentry
, inode
, name
, NULL
, 0);
265 if (!value
|| (error
> xattr_size
)) {
266 value
= krealloc(*xattr_value
, error
+ 1, flags
);
269 memset(value
, 0, error
+ 1);
272 error
= inode
->i_op
->getxattr(dentry
, inode
, name
, value
, error
);
273 *xattr_value
= value
;
278 vfs_getxattr(struct dentry
*dentry
, const char *name
, void *value
, size_t size
)
280 struct inode
*inode
= dentry
->d_inode
;
283 error
= xattr_permission(inode
, name
, MAY_READ
);
287 error
= security_inode_getxattr(dentry
, name
);
291 if (!strncmp(name
, XATTR_SECURITY_PREFIX
,
292 XATTR_SECURITY_PREFIX_LEN
)) {
293 const char *suffix
= name
+ XATTR_SECURITY_PREFIX_LEN
;
294 int ret
= xattr_getsecurity(inode
, suffix
, value
, size
);
296 * Only overwrite the return value if a security module
297 * is actually active.
299 if (ret
== -EOPNOTSUPP
)
304 if (inode
->i_op
->getxattr
)
305 error
= inode
->i_op
->getxattr(dentry
, inode
, name
, value
, size
);
312 EXPORT_SYMBOL_GPL(vfs_getxattr
);
315 vfs_listxattr(struct dentry
*d
, char *list
, size_t size
)
319 error
= security_inode_listxattr(d
);
323 if (d
->d_inode
->i_op
->listxattr
) {
324 error
= d
->d_inode
->i_op
->listxattr(d
, list
, size
);
326 error
= security_inode_listsecurity(d
->d_inode
, list
, size
);
327 if (size
&& error
> size
)
332 EXPORT_SYMBOL_GPL(vfs_listxattr
);
335 vfs_removexattr(struct dentry
*dentry
, const char *name
)
337 struct inode
*inode
= dentry
->d_inode
;
340 if (!inode
->i_op
->removexattr
)
343 error
= xattr_permission(inode
, name
, MAY_WRITE
);
348 error
= security_inode_removexattr(dentry
, name
);
352 error
= inode
->i_op
->removexattr(dentry
, name
);
355 fsnotify_xattr(dentry
);
356 evm_inode_post_removexattr(dentry
, name
);
363 EXPORT_SYMBOL_GPL(vfs_removexattr
);
367 * Extended attribute SET operations
370 setxattr(struct dentry
*d
, const char __user
*name
, const void __user
*value
,
371 size_t size
, int flags
)
375 char kname
[XATTR_NAME_MAX
+ 1];
377 if (flags
& ~(XATTR_CREATE
|XATTR_REPLACE
))
380 error
= strncpy_from_user(kname
, name
, sizeof(kname
));
381 if (error
== 0 || error
== sizeof(kname
))
387 if (size
> XATTR_SIZE_MAX
)
389 kvalue
= kmalloc(size
, GFP_KERNEL
| __GFP_NOWARN
);
391 kvalue
= vmalloc(size
);
395 if (copy_from_user(kvalue
, value
, size
)) {
399 if ((strcmp(kname
, XATTR_NAME_POSIX_ACL_ACCESS
) == 0) ||
400 (strcmp(kname
, XATTR_NAME_POSIX_ACL_DEFAULT
) == 0))
401 posix_acl_fix_xattr_from_user(kvalue
, size
);
404 error
= vfs_setxattr(d
, kname
, kvalue
, size
, flags
);
411 static int path_setxattr(const char __user
*pathname
,
412 const char __user
*name
, const void __user
*value
,
413 size_t size
, int flags
, unsigned int lookup_flags
)
418 error
= user_path_at(AT_FDCWD
, pathname
, lookup_flags
, &path
);
421 error
= mnt_want_write(path
.mnt
);
423 error
= setxattr(path
.dentry
, name
, value
, size
, flags
);
424 mnt_drop_write(path
.mnt
);
427 if (retry_estale(error
, lookup_flags
)) {
428 lookup_flags
|= LOOKUP_REVAL
;
434 SYSCALL_DEFINE5(setxattr
, const char __user
*, pathname
,
435 const char __user
*, name
, const void __user
*, value
,
436 size_t, size
, int, flags
)
438 return path_setxattr(pathname
, name
, value
, size
, flags
, LOOKUP_FOLLOW
);
441 SYSCALL_DEFINE5(lsetxattr
, const char __user
*, pathname
,
442 const char __user
*, name
, const void __user
*, value
,
443 size_t, size
, int, flags
)
445 return path_setxattr(pathname
, name
, value
, size
, flags
, 0);
448 SYSCALL_DEFINE5(fsetxattr
, int, fd
, const char __user
*, name
,
449 const void __user
*,value
, size_t, size
, int, flags
)
451 struct fd f
= fdget(fd
);
457 error
= mnt_want_write_file(f
.file
);
459 error
= setxattr(f
.file
->f_path
.dentry
, name
, value
, size
, flags
);
460 mnt_drop_write_file(f
.file
);
467 * Extended attribute GET operations
470 getxattr(struct dentry
*d
, const char __user
*name
, void __user
*value
,
475 char kname
[XATTR_NAME_MAX
+ 1];
477 error
= strncpy_from_user(kname
, name
, sizeof(kname
));
478 if (error
== 0 || error
== sizeof(kname
))
484 if (size
> XATTR_SIZE_MAX
)
485 size
= XATTR_SIZE_MAX
;
486 kvalue
= kzalloc(size
, GFP_KERNEL
| __GFP_NOWARN
);
488 kvalue
= vmalloc(size
);
494 error
= vfs_getxattr(d
, kname
, kvalue
, size
);
496 if ((strcmp(kname
, XATTR_NAME_POSIX_ACL_ACCESS
) == 0) ||
497 (strcmp(kname
, XATTR_NAME_POSIX_ACL_DEFAULT
) == 0))
498 posix_acl_fix_xattr_to_user(kvalue
, size
);
499 if (size
&& copy_to_user(value
, kvalue
, error
))
501 } else if (error
== -ERANGE
&& size
>= XATTR_SIZE_MAX
) {
502 /* The file system tried to returned a value bigger
503 than XATTR_SIZE_MAX bytes. Not possible. */
512 static ssize_t
path_getxattr(const char __user
*pathname
,
513 const char __user
*name
, void __user
*value
,
514 size_t size
, unsigned int lookup_flags
)
519 error
= user_path_at(AT_FDCWD
, pathname
, lookup_flags
, &path
);
522 error
= getxattr(path
.dentry
, name
, value
, size
);
524 if (retry_estale(error
, lookup_flags
)) {
525 lookup_flags
|= LOOKUP_REVAL
;
531 SYSCALL_DEFINE4(getxattr
, const char __user
*, pathname
,
532 const char __user
*, name
, void __user
*, value
, size_t, size
)
534 return path_getxattr(pathname
, name
, value
, size
, LOOKUP_FOLLOW
);
537 SYSCALL_DEFINE4(lgetxattr
, const char __user
*, pathname
,
538 const char __user
*, name
, void __user
*, value
, size_t, size
)
540 return path_getxattr(pathname
, name
, value
, size
, 0);
543 SYSCALL_DEFINE4(fgetxattr
, int, fd
, const char __user
*, name
,
544 void __user
*, value
, size_t, size
)
546 struct fd f
= fdget(fd
);
547 ssize_t error
= -EBADF
;
552 error
= getxattr(f
.file
->f_path
.dentry
, name
, value
, size
);
558 * Extended attribute LIST operations
561 listxattr(struct dentry
*d
, char __user
*list
, size_t size
)
567 if (size
> XATTR_LIST_MAX
)
568 size
= XATTR_LIST_MAX
;
569 klist
= kmalloc(size
, __GFP_NOWARN
| GFP_KERNEL
);
571 klist
= vmalloc(size
);
577 error
= vfs_listxattr(d
, klist
, size
);
579 if (size
&& copy_to_user(list
, klist
, error
))
581 } else if (error
== -ERANGE
&& size
>= XATTR_LIST_MAX
) {
582 /* The file system tried to returned a list bigger
583 than XATTR_LIST_MAX bytes. Not possible. */
592 static ssize_t
path_listxattr(const char __user
*pathname
, char __user
*list
,
593 size_t size
, unsigned int lookup_flags
)
598 error
= user_path_at(AT_FDCWD
, pathname
, lookup_flags
, &path
);
601 error
= listxattr(path
.dentry
, list
, size
);
603 if (retry_estale(error
, lookup_flags
)) {
604 lookup_flags
|= LOOKUP_REVAL
;
610 SYSCALL_DEFINE3(listxattr
, const char __user
*, pathname
, char __user
*, list
,
613 return path_listxattr(pathname
, list
, size
, LOOKUP_FOLLOW
);
616 SYSCALL_DEFINE3(llistxattr
, const char __user
*, pathname
, char __user
*, list
,
619 return path_listxattr(pathname
, list
, size
, 0);
622 SYSCALL_DEFINE3(flistxattr
, int, fd
, char __user
*, list
, size_t, size
)
624 struct fd f
= fdget(fd
);
625 ssize_t error
= -EBADF
;
630 error
= listxattr(f
.file
->f_path
.dentry
, list
, size
);
636 * Extended attribute REMOVE operations
639 removexattr(struct dentry
*d
, const char __user
*name
)
642 char kname
[XATTR_NAME_MAX
+ 1];
644 error
= strncpy_from_user(kname
, name
, sizeof(kname
));
645 if (error
== 0 || error
== sizeof(kname
))
650 return vfs_removexattr(d
, kname
);
653 static int path_removexattr(const char __user
*pathname
,
654 const char __user
*name
, unsigned int lookup_flags
)
659 error
= user_path_at(AT_FDCWD
, pathname
, lookup_flags
, &path
);
662 error
= mnt_want_write(path
.mnt
);
664 error
= removexattr(path
.dentry
, name
);
665 mnt_drop_write(path
.mnt
);
668 if (retry_estale(error
, lookup_flags
)) {
669 lookup_flags
|= LOOKUP_REVAL
;
675 SYSCALL_DEFINE2(removexattr
, const char __user
*, pathname
,
676 const char __user
*, name
)
678 return path_removexattr(pathname
, name
, LOOKUP_FOLLOW
);
681 SYSCALL_DEFINE2(lremovexattr
, const char __user
*, pathname
,
682 const char __user
*, name
)
684 return path_removexattr(pathname
, name
, 0);
687 SYSCALL_DEFINE2(fremovexattr
, int, fd
, const char __user
*, name
)
689 struct fd f
= fdget(fd
);
695 error
= mnt_want_write_file(f
.file
);
697 error
= removexattr(f
.file
->f_path
.dentry
, name
);
698 mnt_drop_write_file(f
.file
);
705 * Find the handler for the prefix and dispatch its get() operation.
708 generic_getxattr(struct dentry
*dentry
, struct inode
*inode
,
709 const char *name
, void *buffer
, size_t size
)
711 const struct xattr_handler
*handler
;
713 handler
= xattr_resolve_name(inode
, &name
);
715 return PTR_ERR(handler
);
716 return handler
->get(handler
, dentry
, inode
,
721 * Combine the results of the list() operation from every xattr_handler in the
725 generic_listxattr(struct dentry
*dentry
, char *buffer
, size_t buffer_size
)
727 const struct xattr_handler
*handler
, **handlers
= dentry
->d_sb
->s_xattr
;
728 unsigned int size
= 0;
731 for_each_xattr_handler(handlers
, handler
) {
732 if (!handler
->name
||
733 (handler
->list
&& !handler
->list(dentry
)))
735 size
+= strlen(handler
->name
) + 1;
741 for_each_xattr_handler(handlers
, handler
) {
742 if (!handler
->name
||
743 (handler
->list
&& !handler
->list(dentry
)))
745 len
= strlen(handler
->name
);
746 if (len
+ 1 > buffer_size
)
748 memcpy(buf
, handler
->name
, len
+ 1);
750 buffer_size
-= len
+ 1;
758 * Find the handler for the prefix and dispatch its set() operation.
761 generic_setxattr(struct dentry
*dentry
, struct inode
*inode
, const char *name
,
762 const void *value
, size_t size
, int flags
)
764 const struct xattr_handler
*handler
;
767 value
= ""; /* empty EA, do not remove */
768 handler
= xattr_resolve_name(inode
, &name
);
770 return PTR_ERR(handler
);
771 return handler
->set(handler
, dentry
, inode
, name
, value
, size
, flags
);
775 * Find the handler for the prefix and dispatch its set() operation to remove
776 * any associated extended attribute.
779 generic_removexattr(struct dentry
*dentry
, const char *name
)
781 const struct xattr_handler
*handler
;
783 handler
= xattr_resolve_name(d_inode(dentry
), &name
);
785 return PTR_ERR(handler
);
786 return handler
->set(handler
, dentry
, d_inode(dentry
), name
, NULL
,
790 EXPORT_SYMBOL(generic_getxattr
);
791 EXPORT_SYMBOL(generic_listxattr
);
792 EXPORT_SYMBOL(generic_setxattr
);
793 EXPORT_SYMBOL(generic_removexattr
);
796 * xattr_full_name - Compute full attribute name from suffix
798 * @handler: handler of the xattr_handler operation
799 * @name: name passed to the xattr_handler operation
801 * The get and set xattr handler operations are called with the remainder of
802 * the attribute name after skipping the handler's prefix: for example, "foo"
803 * is passed to the get operation of a handler with prefix "user." to get
804 * attribute "user.foo". The full name is still "there" in the name though.
806 * Note: the list xattr handler operation when called from the vfs is passed a
807 * NULL name; some file systems use this operation internally, with varying
810 const char *xattr_full_name(const struct xattr_handler
*handler
,
813 size_t prefix_len
= strlen(xattr_prefix(handler
));
815 return name
- prefix_len
;
817 EXPORT_SYMBOL(xattr_full_name
);
820 * Allocate new xattr and copy in the value; but leave the name to callers.
822 struct simple_xattr
*simple_xattr_alloc(const void *value
, size_t size
)
824 struct simple_xattr
*new_xattr
;
828 len
= sizeof(*new_xattr
) + size
;
829 if (len
< sizeof(*new_xattr
))
832 new_xattr
= kmalloc(len
, GFP_KERNEL
);
836 new_xattr
->size
= size
;
837 memcpy(new_xattr
->value
, value
, size
);
842 * xattr GET operation for in-memory/pseudo filesystems
844 int simple_xattr_get(struct simple_xattrs
*xattrs
, const char *name
,
845 void *buffer
, size_t size
)
847 struct simple_xattr
*xattr
;
850 spin_lock(&xattrs
->lock
);
851 list_for_each_entry(xattr
, &xattrs
->head
, list
) {
852 if (strcmp(name
, xattr
->name
))
857 if (size
< xattr
->size
)
860 memcpy(buffer
, xattr
->value
, xattr
->size
);
864 spin_unlock(&xattrs
->lock
);
869 * simple_xattr_set - xattr SET operation for in-memory/pseudo filesystems
870 * @xattrs: target simple_xattr list
871 * @name: name of the extended attribute
872 * @value: value of the xattr. If %NULL, will remove the attribute.
873 * @size: size of the new xattr
874 * @flags: %XATTR_{CREATE|REPLACE}
876 * %XATTR_CREATE is set, the xattr shouldn't exist already; otherwise fails
877 * with -EEXIST. If %XATTR_REPLACE is set, the xattr should exist;
878 * otherwise, fails with -ENODATA.
880 * Returns 0 on success, -errno on failure.
882 int simple_xattr_set(struct simple_xattrs
*xattrs
, const char *name
,
883 const void *value
, size_t size
, int flags
)
885 struct simple_xattr
*xattr
;
886 struct simple_xattr
*new_xattr
= NULL
;
889 /* value == NULL means remove */
891 new_xattr
= simple_xattr_alloc(value
, size
);
895 new_xattr
->name
= kstrdup(name
, GFP_KERNEL
);
896 if (!new_xattr
->name
) {
902 spin_lock(&xattrs
->lock
);
903 list_for_each_entry(xattr
, &xattrs
->head
, list
) {
904 if (!strcmp(name
, xattr
->name
)) {
905 if (flags
& XATTR_CREATE
) {
908 } else if (new_xattr
) {
909 list_replace(&xattr
->list
, &new_xattr
->list
);
911 list_del(&xattr
->list
);
916 if (flags
& XATTR_REPLACE
) {
920 list_add(&new_xattr
->list
, &xattrs
->head
);
924 spin_unlock(&xattrs
->lock
);
933 static bool xattr_is_trusted(const char *name
)
935 return !strncmp(name
, XATTR_TRUSTED_PREFIX
, XATTR_TRUSTED_PREFIX_LEN
);
938 static int xattr_list_one(char **buffer
, ssize_t
*remaining_size
,
941 size_t len
= strlen(name
) + 1;
943 if (*remaining_size
< len
)
945 memcpy(*buffer
, name
, len
);
948 *remaining_size
-= len
;
953 * xattr LIST operation for in-memory/pseudo filesystems
955 ssize_t
simple_xattr_list(struct inode
*inode
, struct simple_xattrs
*xattrs
,
956 char *buffer
, size_t size
)
958 bool trusted
= capable(CAP_SYS_ADMIN
);
959 struct simple_xattr
*xattr
;
960 ssize_t remaining_size
= size
;
963 #ifdef CONFIG_FS_POSIX_ACL
965 err
= xattr_list_one(&buffer
, &remaining_size
,
966 XATTR_NAME_POSIX_ACL_ACCESS
);
970 if (inode
->i_default_acl
) {
971 err
= xattr_list_one(&buffer
, &remaining_size
,
972 XATTR_NAME_POSIX_ACL_DEFAULT
);
978 spin_lock(&xattrs
->lock
);
979 list_for_each_entry(xattr
, &xattrs
->head
, list
) {
980 /* skip "trusted." attributes for unprivileged callers */
981 if (!trusted
&& xattr_is_trusted(xattr
->name
))
984 err
= xattr_list_one(&buffer
, &remaining_size
, xattr
->name
);
988 spin_unlock(&xattrs
->lock
);
990 return err
? err
: size
- remaining_size
;
994 * Adds an extended attribute to the list
996 void simple_xattr_list_add(struct simple_xattrs
*xattrs
,
997 struct simple_xattr
*new_xattr
)
999 spin_lock(&xattrs
->lock
);
1000 list_add(&new_xattr
->list
, &xattrs
->head
);
1001 spin_unlock(&xattrs
->lock
);