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>
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, a filesystem should create a null-terminated array of struct
40 * xattr_handler (one for each prefix) and hang a pointer to it off of the
41 * s_xattr field of the superblock.
43 #define for_each_xattr_handler(handlers, handler) \
45 for ((handler) = *(handlers)++; \
47 (handler) = *(handlers)++)
50 * Find the xattr_handler with the matching prefix.
52 static const struct xattr_handler
*
53 xattr_resolve_name(struct inode
*inode
, const char **name
)
55 const struct xattr_handler
**handlers
= inode
->i_sb
->s_xattr
;
56 const struct xattr_handler
*handler
;
58 if (!(inode
->i_opflags
& IOP_XATTR
)) {
59 if (unlikely(is_bad_inode(inode
)))
61 return ERR_PTR(-EOPNOTSUPP
);
63 for_each_xattr_handler(handlers
, handler
) {
66 n
= strcmp_prefix(*name
, xattr_prefix(handler
));
68 if (!handler
->prefix
^ !*n
) {
71 return ERR_PTR(-EINVAL
);
77 return ERR_PTR(-EOPNOTSUPP
);
81 * Check permissions for extended attribute access. This is a bit complicated
82 * because different namespaces have very different rules.
85 xattr_permission(struct inode
*inode
, const char *name
, int mask
)
88 * We can never set or remove an extended attribute on a read-only
89 * filesystem or on an immutable / append-only inode.
91 if (mask
& MAY_WRITE
) {
92 if (IS_IMMUTABLE(inode
) || IS_APPEND(inode
))
95 * Updating an xattr will likely cause i_uid and i_gid
96 * to be writen back improperly if their true value is
99 if (HAS_UNMAPPED_ID(inode
))
104 * No restriction for security.* and system.* from the VFS. Decision
105 * on these is left to the underlying filesystem / security module.
107 if (!strncmp(name
, XATTR_SECURITY_PREFIX
, XATTR_SECURITY_PREFIX_LEN
) ||
108 !strncmp(name
, XATTR_SYSTEM_PREFIX
, XATTR_SYSTEM_PREFIX_LEN
))
112 * The trusted.* namespace can only be accessed by privileged users.
114 if (!strncmp(name
, XATTR_TRUSTED_PREFIX
, XATTR_TRUSTED_PREFIX_LEN
)) {
115 if (!capable(CAP_SYS_ADMIN
))
116 return (mask
& MAY_WRITE
) ? -EPERM
: -ENODATA
;
121 * In the user.* namespace, only regular files and directories can have
122 * extended attributes. For sticky directories, only the owner and
123 * privileged users can write attributes.
125 if (!strncmp(name
, XATTR_USER_PREFIX
, XATTR_USER_PREFIX_LEN
)) {
126 if (!S_ISREG(inode
->i_mode
) && !S_ISDIR(inode
->i_mode
))
127 return (mask
& MAY_WRITE
) ? -EPERM
: -ENODATA
;
128 if (S_ISDIR(inode
->i_mode
) && (inode
->i_mode
& S_ISVTX
) &&
129 (mask
& MAY_WRITE
) && !inode_owner_or_capable(inode
))
133 return inode_permission(inode
, mask
);
137 __vfs_setxattr(struct dentry
*dentry
, struct inode
*inode
, const char *name
,
138 const void *value
, size_t size
, int flags
)
140 const struct xattr_handler
*handler
;
142 handler
= xattr_resolve_name(inode
, &name
);
144 return PTR_ERR(handler
);
148 value
= ""; /* empty EA, do not remove */
149 return handler
->set(handler
, dentry
, inode
, name
, value
, size
, flags
);
151 EXPORT_SYMBOL(__vfs_setxattr
);
154 * __vfs_setxattr_noperm - perform setxattr operation without performing
157 * @dentry - object to perform setxattr on
158 * @name - xattr name to set
159 * @value - value to set @name to
160 * @size - size of @value
161 * @flags - flags to pass into filesystem operations
163 * returns the result of the internal setxattr or setsecurity operations.
165 * This function requires the caller to lock the inode's i_mutex before it
166 * is executed. It also assumes that the caller will make the appropriate
169 int __vfs_setxattr_noperm(struct dentry
*dentry
, const char *name
,
170 const void *value
, size_t size
, int flags
)
172 struct inode
*inode
= dentry
->d_inode
;
174 int issec
= !strncmp(name
, XATTR_SECURITY_PREFIX
,
175 XATTR_SECURITY_PREFIX_LEN
);
178 inode
->i_flags
&= ~S_NOSEC
;
179 if (inode
->i_opflags
& IOP_XATTR
) {
180 error
= __vfs_setxattr(dentry
, inode
, name
, value
, size
, flags
);
182 fsnotify_xattr(dentry
);
183 security_inode_post_setxattr(dentry
, name
, value
,
187 if (unlikely(is_bad_inode(inode
)))
190 if (error
== -EAGAIN
) {
194 const char *suffix
= name
+ XATTR_SECURITY_PREFIX_LEN
;
196 error
= security_inode_setsecurity(inode
, suffix
, value
,
199 fsnotify_xattr(dentry
);
205 EXPORT_SYMBOL_GPL(__vfs_setxattr_noperm
);
209 vfs_setxattr(struct dentry
*dentry
, const char *name
, const void *value
,
210 size_t size
, int flags
)
212 struct inode
*inode
= dentry
->d_inode
;
215 error
= xattr_permission(inode
, name
, MAY_WRITE
);
220 error
= security_inode_setxattr(dentry
, name
, value
, size
, flags
);
224 error
= __vfs_setxattr_noperm(dentry
, name
, value
, size
, flags
);
230 EXPORT_SYMBOL_GPL(vfs_setxattr
);
233 xattr_getsecurity(struct inode
*inode
, const char *name
, void *value
,
239 if (!value
|| !size
) {
240 len
= security_inode_getsecurity(inode
, name
, &buffer
, false);
244 len
= security_inode_getsecurity(inode
, name
, &buffer
, true);
251 memcpy(value
, buffer
, len
);
253 security_release_secctx(buffer
, len
);
257 EXPORT_SYMBOL_GPL(xattr_getsecurity
);
260 * vfs_getxattr_alloc - allocate memory, if necessary, before calling getxattr
262 * Allocate memory, if not already allocated, or re-allocate correct size,
263 * before retrieving the extended attribute.
265 * Returns the result of alloc, if failed, or the getxattr operation.
268 vfs_getxattr_alloc(struct dentry
*dentry
, const char *name
, char **xattr_value
,
269 size_t xattr_size
, gfp_t flags
)
271 const struct xattr_handler
*handler
;
272 struct inode
*inode
= dentry
->d_inode
;
273 char *value
= *xattr_value
;
276 error
= xattr_permission(inode
, name
, MAY_READ
);
280 handler
= xattr_resolve_name(inode
, &name
);
282 return PTR_ERR(handler
);
285 error
= handler
->get(handler
, dentry
, inode
, name
, NULL
, 0);
289 if (!value
|| (error
> xattr_size
)) {
290 value
= krealloc(*xattr_value
, error
+ 1, flags
);
293 memset(value
, 0, error
+ 1);
296 error
= handler
->get(handler
, dentry
, inode
, name
, value
, error
);
297 *xattr_value
= value
;
302 __vfs_getxattr(struct dentry
*dentry
, struct inode
*inode
, const char *name
,
303 void *value
, size_t size
)
305 const struct xattr_handler
*handler
;
307 handler
= xattr_resolve_name(inode
, &name
);
309 return PTR_ERR(handler
);
312 return handler
->get(handler
, dentry
, inode
, name
, value
, size
);
314 EXPORT_SYMBOL(__vfs_getxattr
);
317 vfs_getxattr(struct dentry
*dentry
, const char *name
, void *value
, size_t size
)
319 struct inode
*inode
= dentry
->d_inode
;
322 error
= xattr_permission(inode
, name
, MAY_READ
);
326 error
= security_inode_getxattr(dentry
, name
);
330 if (!strncmp(name
, XATTR_SECURITY_PREFIX
,
331 XATTR_SECURITY_PREFIX_LEN
)) {
332 const char *suffix
= name
+ XATTR_SECURITY_PREFIX_LEN
;
333 int ret
= xattr_getsecurity(inode
, suffix
, value
, size
);
335 * Only overwrite the return value if a security module
336 * is actually active.
338 if (ret
== -EOPNOTSUPP
)
343 return __vfs_getxattr(dentry
, inode
, name
, value
, size
);
345 EXPORT_SYMBOL_GPL(vfs_getxattr
);
348 vfs_listxattr(struct dentry
*dentry
, char *list
, size_t size
)
350 struct inode
*inode
= d_inode(dentry
);
353 error
= security_inode_listxattr(dentry
);
356 if (inode
->i_op
->listxattr
&& (inode
->i_opflags
& IOP_XATTR
)) {
358 error
= inode
->i_op
->listxattr(dentry
, list
, size
);
360 error
= security_inode_listsecurity(inode
, list
, size
);
361 if (size
&& error
> size
)
366 EXPORT_SYMBOL_GPL(vfs_listxattr
);
369 __vfs_removexattr(struct dentry
*dentry
, const char *name
)
371 struct inode
*inode
= d_inode(dentry
);
372 const struct xattr_handler
*handler
;
374 handler
= xattr_resolve_name(inode
, &name
);
376 return PTR_ERR(handler
);
379 return handler
->set(handler
, dentry
, inode
, name
, NULL
, 0, XATTR_REPLACE
);
381 EXPORT_SYMBOL(__vfs_removexattr
);
384 * __vfs_removexattr_noperm - perform removexattr operation without
385 * performing permission checks.
387 * @dentry - object to perform setxattr on
388 * @name - xattr name to set
390 * returns the result of the internal setxattr or setsecurity operations.
392 * This function requires the caller to lock the inode's i_mutex before it
393 * is executed. It also assumes that the caller will make the appropriate
397 __vfs_removexattr_noperm(struct dentry
*dentry
, const char *name
)
401 error
=__vfs_removexattr(dentry
, name
);
403 fsnotify_xattr(dentry
);
404 evm_inode_post_removexattr(dentry
, name
);
408 EXPORT_SYMBOL_GPL(__vfs_removexattr_noperm
);
411 vfs_removexattr(struct dentry
*dentry
, const char *name
)
413 struct inode
*inode
= dentry
->d_inode
;
416 error
= xattr_permission(inode
, name
, MAY_WRITE
);
421 error
= security_inode_removexattr(dentry
, name
);
425 error
= __vfs_removexattr_noperm(dentry
, name
);
431 EXPORT_SYMBOL_GPL(vfs_removexattr
);
435 * Extended attribute SET operations
438 setxattr(struct dentry
*d
, const char __user
*name
, const void __user
*value
,
439 size_t size
, int flags
)
443 char kname
[XATTR_NAME_MAX
+ 1];
445 if (flags
& ~(XATTR_CREATE
|XATTR_REPLACE
))
448 error
= strncpy_from_user(kname
, name
, sizeof(kname
));
449 if (error
== 0 || error
== sizeof(kname
))
455 if (size
> XATTR_SIZE_MAX
)
457 kvalue
= kmalloc(size
, GFP_KERNEL
| __GFP_NOWARN
);
459 kvalue
= vmalloc(size
);
463 if (copy_from_user(kvalue
, value
, size
)) {
467 if ((strcmp(kname
, XATTR_NAME_POSIX_ACL_ACCESS
) == 0) ||
468 (strcmp(kname
, XATTR_NAME_POSIX_ACL_DEFAULT
) == 0))
469 posix_acl_fix_xattr_from_user(kvalue
, size
);
472 error
= vfs_setxattr(d
, kname
, kvalue
, size
, flags
);
479 static int path_setxattr(const char __user
*pathname
,
480 const char __user
*name
, const void __user
*value
,
481 size_t size
, int flags
, unsigned int lookup_flags
)
486 error
= user_path_at(AT_FDCWD
, pathname
, lookup_flags
, &path
);
489 error
= mnt_want_write(path
.mnt
);
491 error
= setxattr(path
.dentry
, name
, value
, size
, flags
);
492 mnt_drop_write(path
.mnt
);
495 if (retry_estale(error
, lookup_flags
)) {
496 lookup_flags
|= LOOKUP_REVAL
;
502 SYSCALL_DEFINE5(setxattr
, const char __user
*, pathname
,
503 const char __user
*, name
, const void __user
*, value
,
504 size_t, size
, int, flags
)
506 return path_setxattr(pathname
, name
, value
, size
, flags
, LOOKUP_FOLLOW
);
509 SYSCALL_DEFINE5(lsetxattr
, const char __user
*, pathname
,
510 const char __user
*, name
, const void __user
*, value
,
511 size_t, size
, int, flags
)
513 return path_setxattr(pathname
, name
, value
, size
, flags
, 0);
516 SYSCALL_DEFINE5(fsetxattr
, int, fd
, const char __user
*, name
,
517 const void __user
*,value
, size_t, size
, int, flags
)
519 struct fd f
= fdget(fd
);
525 error
= mnt_want_write_file(f
.file
);
527 error
= setxattr(f
.file
->f_path
.dentry
, name
, value
, size
, flags
);
528 mnt_drop_write_file(f
.file
);
535 * Extended attribute GET operations
538 getxattr(struct dentry
*d
, const char __user
*name
, void __user
*value
,
543 char kname
[XATTR_NAME_MAX
+ 1];
545 error
= strncpy_from_user(kname
, name
, sizeof(kname
));
546 if (error
== 0 || error
== sizeof(kname
))
552 if (size
> XATTR_SIZE_MAX
)
553 size
= XATTR_SIZE_MAX
;
554 kvalue
= kzalloc(size
, GFP_KERNEL
| __GFP_NOWARN
);
556 kvalue
= vmalloc(size
);
562 error
= vfs_getxattr(d
, kname
, kvalue
, size
);
564 if ((strcmp(kname
, XATTR_NAME_POSIX_ACL_ACCESS
) == 0) ||
565 (strcmp(kname
, XATTR_NAME_POSIX_ACL_DEFAULT
) == 0))
566 posix_acl_fix_xattr_to_user(kvalue
, size
);
567 if (size
&& copy_to_user(value
, kvalue
, error
))
569 } else if (error
== -ERANGE
&& size
>= XATTR_SIZE_MAX
) {
570 /* The file system tried to returned a value bigger
571 than XATTR_SIZE_MAX bytes. Not possible. */
580 static ssize_t
path_getxattr(const char __user
*pathname
,
581 const char __user
*name
, void __user
*value
,
582 size_t size
, unsigned int lookup_flags
)
587 error
= user_path_at(AT_FDCWD
, pathname
, lookup_flags
, &path
);
590 error
= getxattr(path
.dentry
, name
, value
, size
);
592 if (retry_estale(error
, lookup_flags
)) {
593 lookup_flags
|= LOOKUP_REVAL
;
599 SYSCALL_DEFINE4(getxattr
, const char __user
*, pathname
,
600 const char __user
*, name
, void __user
*, value
, size_t, size
)
602 return path_getxattr(pathname
, name
, value
, size
, LOOKUP_FOLLOW
);
605 SYSCALL_DEFINE4(lgetxattr
, const char __user
*, pathname
,
606 const char __user
*, name
, void __user
*, value
, size_t, size
)
608 return path_getxattr(pathname
, name
, value
, size
, 0);
611 SYSCALL_DEFINE4(fgetxattr
, int, fd
, const char __user
*, name
,
612 void __user
*, value
, size_t, size
)
614 struct fd f
= fdget(fd
);
615 ssize_t error
= -EBADF
;
620 error
= getxattr(f
.file
->f_path
.dentry
, name
, value
, size
);
626 * Extended attribute LIST operations
629 listxattr(struct dentry
*d
, char __user
*list
, size_t size
)
635 if (size
> XATTR_LIST_MAX
)
636 size
= XATTR_LIST_MAX
;
637 klist
= kmalloc(size
, __GFP_NOWARN
| GFP_KERNEL
);
639 klist
= vmalloc(size
);
645 error
= vfs_listxattr(d
, klist
, size
);
647 if (size
&& copy_to_user(list
, klist
, error
))
649 } else if (error
== -ERANGE
&& size
>= XATTR_LIST_MAX
) {
650 /* The file system tried to returned a list bigger
651 than XATTR_LIST_MAX bytes. Not possible. */
660 static ssize_t
path_listxattr(const char __user
*pathname
, char __user
*list
,
661 size_t size
, unsigned int lookup_flags
)
666 error
= user_path_at(AT_FDCWD
, pathname
, lookup_flags
, &path
);
669 error
= listxattr(path
.dentry
, list
, size
);
671 if (retry_estale(error
, lookup_flags
)) {
672 lookup_flags
|= LOOKUP_REVAL
;
678 SYSCALL_DEFINE3(listxattr
, const char __user
*, pathname
, char __user
*, list
,
681 return path_listxattr(pathname
, list
, size
, LOOKUP_FOLLOW
);
684 SYSCALL_DEFINE3(llistxattr
, const char __user
*, pathname
, char __user
*, list
,
687 return path_listxattr(pathname
, list
, size
, 0);
690 SYSCALL_DEFINE3(flistxattr
, int, fd
, char __user
*, list
, size_t, size
)
692 struct fd f
= fdget(fd
);
693 ssize_t error
= -EBADF
;
698 error
= listxattr(f
.file
->f_path
.dentry
, list
, size
);
704 * Extended attribute REMOVE operations
707 removexattr(struct dentry
*d
, const char __user
*name
)
710 char kname
[XATTR_NAME_MAX
+ 1];
712 error
= strncpy_from_user(kname
, name
, sizeof(kname
));
713 if (error
== 0 || error
== sizeof(kname
))
718 return vfs_removexattr(d
, kname
);
721 static int path_removexattr(const char __user
*pathname
,
722 const char __user
*name
, unsigned int lookup_flags
)
727 error
= user_path_at(AT_FDCWD
, pathname
, lookup_flags
, &path
);
730 error
= mnt_want_write(path
.mnt
);
732 error
= removexattr(path
.dentry
, name
);
733 mnt_drop_write(path
.mnt
);
736 if (retry_estale(error
, lookup_flags
)) {
737 lookup_flags
|= LOOKUP_REVAL
;
743 SYSCALL_DEFINE2(removexattr
, const char __user
*, pathname
,
744 const char __user
*, name
)
746 return path_removexattr(pathname
, name
, LOOKUP_FOLLOW
);
749 SYSCALL_DEFINE2(lremovexattr
, const char __user
*, pathname
,
750 const char __user
*, name
)
752 return path_removexattr(pathname
, name
, 0);
755 SYSCALL_DEFINE2(fremovexattr
, int, fd
, const char __user
*, name
)
757 struct fd f
= fdget(fd
);
763 error
= mnt_want_write_file(f
.file
);
765 error
= removexattr(f
.file
->f_path
.dentry
, name
);
766 mnt_drop_write_file(f
.file
);
773 * Combine the results of the list() operation from every xattr_handler in the
777 generic_listxattr(struct dentry
*dentry
, char *buffer
, size_t buffer_size
)
779 const struct xattr_handler
*handler
, **handlers
= dentry
->d_sb
->s_xattr
;
780 unsigned int size
= 0;
783 for_each_xattr_handler(handlers
, handler
) {
784 if (!handler
->name
||
785 (handler
->list
&& !handler
->list(dentry
)))
787 size
+= strlen(handler
->name
) + 1;
793 for_each_xattr_handler(handlers
, handler
) {
794 if (!handler
->name
||
795 (handler
->list
&& !handler
->list(dentry
)))
797 len
= strlen(handler
->name
);
798 if (len
+ 1 > buffer_size
)
800 memcpy(buf
, handler
->name
, len
+ 1);
802 buffer_size
-= len
+ 1;
808 EXPORT_SYMBOL(generic_listxattr
);
811 * xattr_full_name - Compute full attribute name from suffix
813 * @handler: handler of the xattr_handler operation
814 * @name: name passed to the xattr_handler operation
816 * The get and set xattr handler operations are called with the remainder of
817 * the attribute name after skipping the handler's prefix: for example, "foo"
818 * is passed to the get operation of a handler with prefix "user." to get
819 * attribute "user.foo". The full name is still "there" in the name though.
821 * Note: the list xattr handler operation when called from the vfs is passed a
822 * NULL name; some file systems use this operation internally, with varying
825 const char *xattr_full_name(const struct xattr_handler
*handler
,
828 size_t prefix_len
= strlen(xattr_prefix(handler
));
830 return name
- prefix_len
;
832 EXPORT_SYMBOL(xattr_full_name
);
835 * Allocate new xattr and copy in the value; but leave the name to callers.
837 struct simple_xattr
*simple_xattr_alloc(const void *value
, size_t size
)
839 struct simple_xattr
*new_xattr
;
843 len
= sizeof(*new_xattr
) + size
;
844 if (len
< sizeof(*new_xattr
))
847 new_xattr
= kmalloc(len
, GFP_KERNEL
);
851 new_xattr
->size
= size
;
852 memcpy(new_xattr
->value
, value
, size
);
857 * xattr GET operation for in-memory/pseudo filesystems
859 int simple_xattr_get(struct simple_xattrs
*xattrs
, const char *name
,
860 void *buffer
, size_t size
)
862 struct simple_xattr
*xattr
;
865 spin_lock(&xattrs
->lock
);
866 list_for_each_entry(xattr
, &xattrs
->head
, list
) {
867 if (strcmp(name
, xattr
->name
))
872 if (size
< xattr
->size
)
875 memcpy(buffer
, xattr
->value
, xattr
->size
);
879 spin_unlock(&xattrs
->lock
);
884 * simple_xattr_set - xattr SET operation for in-memory/pseudo filesystems
885 * @xattrs: target simple_xattr list
886 * @name: name of the extended attribute
887 * @value: value of the xattr. If %NULL, will remove the attribute.
888 * @size: size of the new xattr
889 * @flags: %XATTR_{CREATE|REPLACE}
891 * %XATTR_CREATE is set, the xattr shouldn't exist already; otherwise fails
892 * with -EEXIST. If %XATTR_REPLACE is set, the xattr should exist;
893 * otherwise, fails with -ENODATA.
895 * Returns 0 on success, -errno on failure.
897 int simple_xattr_set(struct simple_xattrs
*xattrs
, const char *name
,
898 const void *value
, size_t size
, int flags
)
900 struct simple_xattr
*xattr
;
901 struct simple_xattr
*new_xattr
= NULL
;
904 /* value == NULL means remove */
906 new_xattr
= simple_xattr_alloc(value
, size
);
910 new_xattr
->name
= kstrdup(name
, GFP_KERNEL
);
911 if (!new_xattr
->name
) {
917 spin_lock(&xattrs
->lock
);
918 list_for_each_entry(xattr
, &xattrs
->head
, list
) {
919 if (!strcmp(name
, xattr
->name
)) {
920 if (flags
& XATTR_CREATE
) {
923 } else if (new_xattr
) {
924 list_replace(&xattr
->list
, &new_xattr
->list
);
926 list_del(&xattr
->list
);
931 if (flags
& XATTR_REPLACE
) {
935 list_add(&new_xattr
->list
, &xattrs
->head
);
939 spin_unlock(&xattrs
->lock
);
948 static bool xattr_is_trusted(const char *name
)
950 return !strncmp(name
, XATTR_TRUSTED_PREFIX
, XATTR_TRUSTED_PREFIX_LEN
);
953 static int xattr_list_one(char **buffer
, ssize_t
*remaining_size
,
956 size_t len
= strlen(name
) + 1;
958 if (*remaining_size
< len
)
960 memcpy(*buffer
, name
, len
);
963 *remaining_size
-= len
;
968 * xattr LIST operation for in-memory/pseudo filesystems
970 ssize_t
simple_xattr_list(struct inode
*inode
, struct simple_xattrs
*xattrs
,
971 char *buffer
, size_t size
)
973 bool trusted
= capable(CAP_SYS_ADMIN
);
974 struct simple_xattr
*xattr
;
975 ssize_t remaining_size
= size
;
978 #ifdef CONFIG_FS_POSIX_ACL
980 err
= xattr_list_one(&buffer
, &remaining_size
,
981 XATTR_NAME_POSIX_ACL_ACCESS
);
985 if (inode
->i_default_acl
) {
986 err
= xattr_list_one(&buffer
, &remaining_size
,
987 XATTR_NAME_POSIX_ACL_DEFAULT
);
993 spin_lock(&xattrs
->lock
);
994 list_for_each_entry(xattr
, &xattrs
->head
, list
) {
995 /* skip "trusted." attributes for unprivileged callers */
996 if (!trusted
&& xattr_is_trusted(xattr
->name
))
999 err
= xattr_list_one(&buffer
, &remaining_size
, xattr
->name
);
1003 spin_unlock(&xattrs
->lock
);
1005 return err
? err
: size
- remaining_size
;
1009 * Adds an extended attribute to the list
1011 void simple_xattr_list_add(struct simple_xattrs
*xattrs
,
1012 struct simple_xattr
*new_xattr
)
1014 spin_lock(&xattrs
->lock
);
1015 list_add(&new_xattr
->list
, &xattrs
->head
);
1016 spin_unlock(&xattrs
->lock
);