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