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1#include "reiserfs.h"
2#include <linux/errno.h>
3#include <linux/fs.h>
4#include <linux/pagemap.h>
5#include <linux/xattr.h>
6#include <linux/slab.h>
7#include "xattr.h"
8#include <linux/security.h>
9#include <linux/uaccess.h>
10
11static int
12security_get(const struct xattr_handler *handler, struct dentry *dentry,
13 const char *name, void *buffer, size_t size)
14{
15 if (strlen(name) < sizeof(XATTR_SECURITY_PREFIX))
16 return -EINVAL;
17
18 if (IS_PRIVATE(d_inode(dentry)))
19 return -EPERM;
20
21 return reiserfs_xattr_get(d_inode(dentry), name, buffer, size);
22}
23
24static int
25security_set(const struct xattr_handler *handler, struct dentry *dentry,
26 const char *name, const void *buffer, size_t size, int flags)
27{
28 if (strlen(name) < sizeof(XATTR_SECURITY_PREFIX))
29 return -EINVAL;
30
31 if (IS_PRIVATE(d_inode(dentry)))
32 return -EPERM;
33
34 return reiserfs_xattr_set(d_inode(dentry), name, buffer, size, flags);
35}
36
37static bool security_list(struct dentry *dentry)
38{
39 return !IS_PRIVATE(d_inode(dentry));
40}
41
42/* Initializes the security context for a new inode and returns the number
43 * of blocks needed for the transaction. If successful, reiserfs_security
44 * must be released using reiserfs_security_free when the caller is done. */
45int reiserfs_security_init(struct inode *dir, struct inode *inode,
46 const struct qstr *qstr,
47 struct reiserfs_security_handle *sec)
48{
49 int blocks = 0;
50 int error;
51
52 sec->name = NULL;
53
54 /* Don't add selinux attributes on xattrs - they'll never get used */
55 if (IS_PRIVATE(dir))
56 return 0;
57
58 error = security_old_inode_init_security(inode, dir, qstr, &sec->name,
59 &sec->value, &sec->length);
60 if (error) {
61 if (error == -EOPNOTSUPP)
62 error = 0;
63
64 sec->name = NULL;
65 sec->value = NULL;
66 sec->length = 0;
67 return error;
68 }
69
70 if (sec->length && reiserfs_xattrs_initialized(inode->i_sb)) {
71 blocks = reiserfs_xattr_jcreate_nblocks(inode) +
72 reiserfs_xattr_nblocks(inode, sec->length);
73 /* We don't want to count the directories twice if we have
74 * a default ACL. */
75 REISERFS_I(inode)->i_flags |= i_has_xattr_dir;
76 }
77 return blocks;
78}
79
80int reiserfs_security_write(struct reiserfs_transaction_handle *th,
81 struct inode *inode,
82 struct reiserfs_security_handle *sec)
83{
84 int error;
85 if (strlen(sec->name) < sizeof(XATTR_SECURITY_PREFIX))
86 return -EINVAL;
87
88 error = reiserfs_xattr_set_handle(th, inode, sec->name, sec->value,
89 sec->length, XATTR_CREATE);
90 if (error == -ENODATA || error == -EOPNOTSUPP)
91 error = 0;
92
93 return error;
94}
95
96void reiserfs_security_free(struct reiserfs_security_handle *sec)
97{
98 kfree(sec->name);
99 kfree(sec->value);
100 sec->name = NULL;
101 sec->value = NULL;
102}
103
104const struct xattr_handler reiserfs_xattr_security_handler = {
105 .prefix = XATTR_SECURITY_PREFIX,
106 .get = security_get,
107 .set = security_set,
108 .list = security_list,
109};
1// SPDX-License-Identifier: GPL-2.0
2#include "reiserfs.h"
3#include <linux/errno.h>
4#include <linux/fs.h>
5#include <linux/pagemap.h>
6#include <linux/xattr.h>
7#include <linux/slab.h>
8#include "xattr.h"
9#include <linux/security.h>
10#include <linux/uaccess.h>
11
12static int
13security_get(const struct xattr_handler *handler, struct dentry *unused,
14 struct inode *inode, const char *name, void *buffer, size_t size)
15{
16 if (IS_PRIVATE(inode))
17 return -EPERM;
18
19 return reiserfs_xattr_get(inode, xattr_full_name(handler, name),
20 buffer, size);
21}
22
23static int
24security_set(const struct xattr_handler *handler, struct dentry *unused,
25 struct inode *inode, const char *name, const void *buffer,
26 size_t size, int flags)
27{
28 if (IS_PRIVATE(inode))
29 return -EPERM;
30
31 return reiserfs_xattr_set(inode,
32 xattr_full_name(handler, name),
33 buffer, size, flags);
34}
35
36static bool security_list(struct dentry *dentry)
37{
38 return !IS_PRIVATE(d_inode(dentry));
39}
40
41/* Initializes the security context for a new inode and returns the number
42 * of blocks needed for the transaction. If successful, reiserfs_security
43 * must be released using reiserfs_security_free when the caller is done. */
44int reiserfs_security_init(struct inode *dir, struct inode *inode,
45 const struct qstr *qstr,
46 struct reiserfs_security_handle *sec)
47{
48 int blocks = 0;
49 int error;
50
51 sec->name = NULL;
52
53 /* Don't add selinux attributes on xattrs - they'll never get used */
54 if (IS_PRIVATE(dir))
55 return 0;
56
57 error = security_old_inode_init_security(inode, dir, qstr, &sec->name,
58 &sec->value, &sec->length);
59 if (error) {
60 if (error == -EOPNOTSUPP)
61 error = 0;
62
63 sec->name = NULL;
64 sec->value = NULL;
65 sec->length = 0;
66 return error;
67 }
68
69 if (sec->length && reiserfs_xattrs_initialized(inode->i_sb)) {
70 blocks = reiserfs_xattr_jcreate_nblocks(inode) +
71 reiserfs_xattr_nblocks(inode, sec->length);
72 /* We don't want to count the directories twice if we have
73 * a default ACL. */
74 REISERFS_I(inode)->i_flags |= i_has_xattr_dir;
75 }
76 return blocks;
77}
78
79int reiserfs_security_write(struct reiserfs_transaction_handle *th,
80 struct inode *inode,
81 struct reiserfs_security_handle *sec)
82{
83 int error;
84 if (strlen(sec->name) < sizeof(XATTR_SECURITY_PREFIX))
85 return -EINVAL;
86
87 error = reiserfs_xattr_set_handle(th, inode, sec->name, sec->value,
88 sec->length, XATTR_CREATE);
89 if (error == -ENODATA || error == -EOPNOTSUPP)
90 error = 0;
91
92 return error;
93}
94
95void reiserfs_security_free(struct reiserfs_security_handle *sec)
96{
97 kfree(sec->name);
98 kfree(sec->value);
99 sec->name = NULL;
100 sec->value = NULL;
101}
102
103const struct xattr_handler reiserfs_xattr_security_handler = {
104 .prefix = XATTR_SECURITY_PREFIX,
105 .get = security_get,
106 .set = security_set,
107 .list = security_list,
108};