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Al Virof466c6f2012-03-17 01:16:43 -04001#include "reiserfs.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -07002#include <linux/errno.h>
3#include <linux/fs.h>
4#include <linux/pagemap.h>
5#include <linux/xattr.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +09006#include <linux/slab.h>
Al Viroc45ac882012-03-17 00:59:06 -04007#include "xattr.h"
Jeff Mahoney57fe60d2009-03-30 14:02:41 -04008#include <linux/security.h>
Fabian Frederick17093992014-08-08 14:21:12 -07009#include <linux/uaccess.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070010
Linus Torvalds1da177e2005-04-16 15:20:36 -070011static int
Christoph Hellwig431547b2009-11-13 09:52:56 +000012security_get(struct dentry *dentry, const char *name, void *buffer, size_t size,
13 int handler_flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -070014{
Linus Torvaldsbd4c6252005-07-12 20:21:28 -070015 if (strlen(name) < sizeof(XATTR_SECURITY_PREFIX))
16 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -070017
Christoph Hellwig431547b2009-11-13 09:52:56 +000018 if (IS_PRIVATE(dentry->d_inode))
Linus Torvaldsbd4c6252005-07-12 20:21:28 -070019 return -EPERM;
Linus Torvalds1da177e2005-04-16 15:20:36 -070020
Christoph Hellwig431547b2009-11-13 09:52:56 +000021 return reiserfs_xattr_get(dentry->d_inode, name, buffer, size);
Linus Torvalds1da177e2005-04-16 15:20:36 -070022}
23
24static int
Christoph Hellwig431547b2009-11-13 09:52:56 +000025security_set(struct dentry *dentry, const char *name, const void *buffer,
26 size_t size, int flags, int handler_flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -070027{
Linus Torvaldsbd4c6252005-07-12 20:21:28 -070028 if (strlen(name) < sizeof(XATTR_SECURITY_PREFIX))
29 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -070030
Christoph Hellwig431547b2009-11-13 09:52:56 +000031 if (IS_PRIVATE(dentry->d_inode))
Linus Torvaldsbd4c6252005-07-12 20:21:28 -070032 return -EPERM;
Linus Torvalds1da177e2005-04-16 15:20:36 -070033
Christoph Hellwig431547b2009-11-13 09:52:56 +000034 return reiserfs_xattr_set(dentry->d_inode, name, buffer, size, flags);
Linus Torvaldsbd4c6252005-07-12 20:21:28 -070035}
36
Christoph Hellwig431547b2009-11-13 09:52:56 +000037static size_t security_list(struct dentry *dentry, char *list, size_t list_len,
38 const char *name, size_t namelen, int handler_flags)
Linus Torvaldsbd4c6252005-07-12 20:21:28 -070039{
Jeff Mahoney48b32a32009-03-30 14:02:38 -040040 const size_t len = namelen + 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -070041
Christoph Hellwig431547b2009-11-13 09:52:56 +000042 if (IS_PRIVATE(dentry->d_inode))
Linus Torvaldsbd4c6252005-07-12 20:21:28 -070043 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -070044
Jeff Mahoney48b32a32009-03-30 14:02:38 -040045 if (list && len <= list_len) {
46 memcpy(list, name, namelen);
47 list[namelen] = '\0';
48 }
Linus Torvaldsbd4c6252005-07-12 20:21:28 -070049
50 return len;
Linus Torvalds1da177e2005-04-16 15:20:36 -070051}
52
Jeff Mahoney57fe60d2009-03-30 14:02:41 -040053/* Initializes the security context for a new inode and returns the number
54 * of blocks needed for the transaction. If successful, reiserfs_security
55 * must be released using reiserfs_security_free when the caller is done. */
56int reiserfs_security_init(struct inode *dir, struct inode *inode,
Eric Paris2a7dba32011-02-01 11:05:39 -050057 const struct qstr *qstr,
Jeff Mahoney57fe60d2009-03-30 14:02:41 -040058 struct reiserfs_security_handle *sec)
59{
60 int blocks = 0;
Jeff Mahoneyb82bb722009-05-05 15:30:16 -040061 int error;
62
63 sec->name = NULL;
64
65 /* Don't add selinux attributes on xattrs - they'll never get used */
66 if (IS_PRIVATE(dir))
67 return 0;
68
Mimi Zohar9d8f13b2011-06-06 15:29:25 -040069 error = security_old_inode_init_security(inode, dir, qstr, &sec->name,
70 &sec->value, &sec->length);
Jeff Mahoney57fe60d2009-03-30 14:02:41 -040071 if (error) {
72 if (error == -EOPNOTSUPP)
73 error = 0;
74
75 sec->name = NULL;
76 sec->value = NULL;
77 sec->length = 0;
78 return error;
79 }
80
Jeff Mahoney6cb4aff2010-03-23 13:35:38 -070081 if (sec->length && reiserfs_xattrs_initialized(inode->i_sb)) {
Jeff Mahoney57fe60d2009-03-30 14:02:41 -040082 blocks = reiserfs_xattr_jcreate_nblocks(inode) +
83 reiserfs_xattr_nblocks(inode, sec->length);
84 /* We don't want to count the directories twice if we have
85 * a default ACL. */
86 REISERFS_I(inode)->i_flags |= i_has_xattr_dir;
87 }
88 return blocks;
89}
90
91int reiserfs_security_write(struct reiserfs_transaction_handle *th,
92 struct inode *inode,
93 struct reiserfs_security_handle *sec)
94{
95 int error;
96 if (strlen(sec->name) < sizeof(XATTR_SECURITY_PREFIX))
97 return -EINVAL;
98
99 error = reiserfs_xattr_set_handle(th, inode, sec->name, sec->value,
100 sec->length, XATTR_CREATE);
101 if (error == -ENODATA || error == -EOPNOTSUPP)
102 error = 0;
103
104 return error;
105}
106
107void reiserfs_security_free(struct reiserfs_security_handle *sec)
108{
109 kfree(sec->name);
110 kfree(sec->value);
111 sec->name = NULL;
112 sec->value = NULL;
113}
114
Stephen Hemminger94d09a92010-05-13 17:53:19 -0700115const struct xattr_handler reiserfs_xattr_security_handler = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700116 .prefix = XATTR_SECURITY_PREFIX,
117 .get = security_get,
118 .set = security_set,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700119 .list = security_list,
120};