1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * linux/fs/ext2/xattr_security.c
4 * Handler for storing security labels as extended attributes.
5 */
6
7 #include "ext2.h"
8 #include <linux/security.h>
9 #include "xattr.h"
10
11 static int
ext2_xattr_security_get(const struct xattr_handler * handler,struct dentry * unused,struct inode * inode,const char * name,void * buffer,size_t size)12 ext2_xattr_security_get(const struct xattr_handler *handler,
13 struct dentry *unused, struct inode *inode,
14 const char *name, void *buffer, size_t size)
15 {
16 return ext2_xattr_get(inode, EXT2_XATTR_INDEX_SECURITY, name,
17 buffer, size);
18 }
19
20 static int
ext2_xattr_security_set(const struct xattr_handler * handler,struct user_namespace * mnt_userns,struct dentry * unused,struct inode * inode,const char * name,const void * value,size_t size,int flags)21 ext2_xattr_security_set(const struct xattr_handler *handler,
22 struct user_namespace *mnt_userns,
23 struct dentry *unused, struct inode *inode,
24 const char *name, const void *value,
25 size_t size, int flags)
26 {
27 return ext2_xattr_set(inode, EXT2_XATTR_INDEX_SECURITY, name,
28 value, size, flags);
29 }
30
ext2_initxattrs(struct inode * inode,const struct xattr * xattr_array,void * fs_info)31 static int ext2_initxattrs(struct inode *inode, const struct xattr *xattr_array,
32 void *fs_info)
33 {
34 const struct xattr *xattr;
35 int err = 0;
36
37 for (xattr = xattr_array; xattr->name != NULL; xattr++) {
38 err = ext2_xattr_set(inode, EXT2_XATTR_INDEX_SECURITY,
39 xattr->name, xattr->value,
40 xattr->value_len, 0);
41 if (err < 0)
42 break;
43 }
44 return err;
45 }
46
47 int
ext2_init_security(struct inode * inode,struct inode * dir,const struct qstr * qstr)48 ext2_init_security(struct inode *inode, struct inode *dir,
49 const struct qstr *qstr)
50 {
51 return security_inode_init_security(inode, dir, qstr,
52 &ext2_initxattrs, NULL);
53 }
54
55 const struct xattr_handler ext2_xattr_security_handler = {
56 .prefix = XATTR_SECURITY_PREFIX,
57 .get = ext2_xattr_security_get,
58 .set = ext2_xattr_security_set,
59 };
60