Commit | Line | Data |
---|---|---|
f466c6fd | 1 | #include "reiserfs.h" |
1da177e4 LT |
2 | #include <linux/errno.h> |
3 | #include <linux/fs.h> | |
4 | #include <linux/pagemap.h> | |
5 | #include <linux/xattr.h> | |
5a0e3ad6 | 6 | #include <linux/slab.h> |
c45ac888 | 7 | #include "xattr.h" |
57fe60df | 8 | #include <linux/security.h> |
17093991 | 9 | #include <linux/uaccess.h> |
1da177e4 | 10 | |
1da177e4 | 11 | static int |
431547b3 CH |
12 | security_get(struct dentry *dentry, const char *name, void *buffer, size_t size, |
13 | int handler_flags) | |
1da177e4 | 14 | { |
bd4c625c LT |
15 | if (strlen(name) < sizeof(XATTR_SECURITY_PREFIX)) |
16 | return -EINVAL; | |
1da177e4 | 17 | |
431547b3 | 18 | if (IS_PRIVATE(dentry->d_inode)) |
bd4c625c | 19 | return -EPERM; |
1da177e4 | 20 | |
431547b3 | 21 | return reiserfs_xattr_get(dentry->d_inode, name, buffer, size); |
1da177e4 LT |
22 | } |
23 | ||
24 | static int | |
431547b3 CH |
25 | security_set(struct dentry *dentry, const char *name, const void *buffer, |
26 | size_t size, int flags, int handler_flags) | |
1da177e4 | 27 | { |
bd4c625c LT |
28 | if (strlen(name) < sizeof(XATTR_SECURITY_PREFIX)) |
29 | return -EINVAL; | |
1da177e4 | 30 | |
431547b3 | 31 | if (IS_PRIVATE(dentry->d_inode)) |
bd4c625c | 32 | return -EPERM; |
1da177e4 | 33 | |
431547b3 | 34 | return reiserfs_xattr_set(dentry->d_inode, name, buffer, size, flags); |
1da177e4 LT |
35 | } |
36 | ||
431547b3 CH |
37 | static size_t security_list(struct dentry *dentry, char *list, size_t list_len, |
38 | const char *name, size_t namelen, int handler_flags) | |
1da177e4 | 39 | { |
48b32a35 | 40 | const size_t len = namelen + 1; |
1da177e4 | 41 | |
431547b3 | 42 | if (IS_PRIVATE(dentry->d_inode)) |
bd4c625c | 43 | return 0; |
1da177e4 | 44 | |
48b32a35 JM |
45 | if (list && len <= list_len) { |
46 | memcpy(list, name, namelen); | |
47 | list[namelen] = '\0'; | |
48 | } | |
1da177e4 | 49 | |
bd4c625c | 50 | return len; |
1da177e4 LT |
51 | } |
52 | ||
57fe60df JM |
53 | /* 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. */ | |
56 | int reiserfs_security_init(struct inode *dir, struct inode *inode, | |
2a7dba39 | 57 | const struct qstr *qstr, |
57fe60df JM |
58 | struct reiserfs_security_handle *sec) |
59 | { | |
60 | int blocks = 0; | |
b82bb72b JM |
61 | 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 | ||
9d8f13ba MZ |
69 | error = security_old_inode_init_security(inode, dir, qstr, &sec->name, |
70 | &sec->value, &sec->length); | |
57fe60df JM |
71 | 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 | ||
6cb4aff0 | 81 | if (sec->length && reiserfs_xattrs_initialized(inode->i_sb)) { |
57fe60df JM |
82 | 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 | ||
91 | int 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 | ||
107 | void 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 | ||
94d09a98 | 115 | const struct xattr_handler reiserfs_xattr_security_handler = { |
1da177e4 LT |
116 | .prefix = XATTR_SECURITY_PREFIX, |
117 | .get = security_get, | |
118 | .set = security_set, | |
1da177e4 LT |
119 | .list = security_list, |
120 | }; |