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