1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * linux/fs/ext4/xattr_security.c
4 * Handler for storing security labels as extended attributes.
5 */
6
7 #include <linux/string.h>
8 #include <linux/fs.h>
9 #include <linux/security.h>
10 #include <linux/slab.h>
11 #include "ext4_jbd2.h"
12 #include "ext4.h"
13 #include "xattr.h"
14
15 static int
ext4_xattr_security_get(const struct xattr_handler * handler,struct dentry * unused,struct inode * inode,const char * name,void * buffer,size_t size)16 ext4_xattr_security_get(const struct xattr_handler *handler,
17 struct dentry *unused, struct inode *inode,
18 const char *name, void *buffer, size_t size)
19 {
20 return ext4_xattr_get(inode, EXT4_XATTR_INDEX_SECURITY,
21 name, buffer, size);
22 }
23
24 static int
ext4_xattr_security_set(const struct xattr_handler * handler,struct mnt_idmap * idmap,struct dentry * unused,struct inode * inode,const char * name,const void * value,size_t size,int flags)25 ext4_xattr_security_set(const struct xattr_handler *handler,
26 struct mnt_idmap *idmap,
27 struct dentry *unused, struct inode *inode,
28 const char *name, const void *value,
29 size_t size, int flags)
30 {
31 return ext4_xattr_set(inode, EXT4_XATTR_INDEX_SECURITY,
32 name, value, size, flags);
33 }
34
35 static int
ext4_initxattrs(struct inode * inode,const struct xattr * xattr_array,void * fs_info)36 ext4_initxattrs(struct inode *inode, const struct xattr *xattr_array,
37 void *fs_info)
38 {
39 const struct xattr *xattr;
40 handle_t *handle = fs_info;
41 int err = 0;
42
43 for (xattr = xattr_array; xattr->name != NULL; xattr++) {
44 err = ext4_xattr_set_handle(handle, inode,
45 EXT4_XATTR_INDEX_SECURITY,
46 xattr->name, xattr->value,
47 xattr->value_len, XATTR_CREATE);
48 if (err < 0)
49 break;
50 }
51 return err;
52 }
53
54 int
ext4_init_security(handle_t * handle,struct inode * inode,struct inode * dir,const struct qstr * qstr)55 ext4_init_security(handle_t *handle, struct inode *inode, struct inode *dir,
56 const struct qstr *qstr)
57 {
58 return security_inode_init_security(inode, dir, qstr,
59 &ext4_initxattrs, handle);
60 }
61
62 const struct xattr_handler ext4_xattr_security_handler = {
63 .prefix = XATTR_SECURITY_PREFIX,
64 .get = ext4_xattr_security_get,
65 .set = ext4_xattr_security_set,
66 };
67