Commit | Line | Data |
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b2441318 | 1 | // SPDX-License-Identifier: GPL-2.0 |
f466c6fd | 2 | #include "reiserfs.h" |
1da177e4 LT |
3 | #include <linux/errno.h> |
4 | #include <linux/fs.h> | |
5 | #include <linux/pagemap.h> | |
6 | #include <linux/xattr.h> | |
5a0e3ad6 | 7 | #include <linux/slab.h> |
c45ac888 | 8 | #include "xattr.h" |
57fe60df | 9 | #include <linux/security.h> |
17093991 | 10 | #include <linux/uaccess.h> |
1da177e4 | 11 | |
1da177e4 | 12 | static int |
b296821a AV |
13 | security_get(const struct xattr_handler *handler, struct dentry *unused, |
14 | struct inode *inode, const char *name, void *buffer, size_t size) | |
1da177e4 | 15 | { |
b296821a | 16 | if (IS_PRIVATE(inode)) |
bd4c625c | 17 | return -EPERM; |
1da177e4 | 18 | |
b296821a | 19 | return reiserfs_xattr_get(inode, xattr_full_name(handler, name), |
79a628d1 | 20 | buffer, size); |
1da177e4 LT |
21 | } |
22 | ||
23 | static int | |
e65ce2a5 | 24 | security_set(const struct xattr_handler *handler, |
39f60c1c | 25 | struct mnt_idmap *idmap, struct dentry *unused, |
59301226 AV |
26 | struct inode *inode, const char *name, const void *buffer, |
27 | size_t size, int flags) | |
1da177e4 | 28 | { |
59301226 | 29 | if (IS_PRIVATE(inode)) |
bd4c625c | 30 | return -EPERM; |
1da177e4 | 31 | |
59301226 | 32 | return reiserfs_xattr_set(inode, |
79a628d1 AV |
33 | xattr_full_name(handler, name), |
34 | buffer, size, flags); | |
1da177e4 LT |
35 | } |
36 | ||
764a5c6b | 37 | static bool security_list(struct dentry *dentry) |
1da177e4 | 38 | { |
764a5c6b | 39 | return !IS_PRIVATE(d_inode(dentry)); |
1da177e4 LT |
40 | } |
41 | ||
52ca4b64 RS |
42 | static int |
43 | reiserfs_initxattrs(struct inode *inode, const struct xattr *xattr_array, | |
44 | void *fs_info) | |
45 | { | |
46 | struct reiserfs_security_handle *sec = fs_info; | |
47 | ||
48 | sec->value = kmemdup(xattr_array->value, xattr_array->value_len, | |
49 | GFP_KERNEL); | |
50 | if (!sec->value) | |
51 | return -ENOMEM; | |
52 | ||
53 | sec->name = xattr_array->name; | |
54 | sec->length = xattr_array->value_len; | |
55 | return 0; | |
56 | } | |
57 | ||
57fe60df JM |
58 | /* Initializes the security context for a new inode and returns the number |
59 | * of blocks needed for the transaction. If successful, reiserfs_security | |
60 | * must be released using reiserfs_security_free when the caller is done. */ | |
61 | int reiserfs_security_init(struct inode *dir, struct inode *inode, | |
2a7dba39 | 62 | const struct qstr *qstr, |
57fe60df JM |
63 | struct reiserfs_security_handle *sec) |
64 | { | |
65 | int blocks = 0; | |
b82bb72b JM |
66 | int error; |
67 | ||
68 | sec->name = NULL; | |
572302af | 69 | sec->value = NULL; |
d031f4e8 | 70 | sec->length = 0; |
b82bb72b JM |
71 | |
72 | /* Don't add selinux attributes on xattrs - they'll never get used */ | |
73 | if (IS_PRIVATE(dir)) | |
74 | return 0; | |
75 | ||
52ca4b64 RS |
76 | error = security_inode_init_security(inode, dir, qstr, |
77 | &reiserfs_initxattrs, sec); | |
57fe60df | 78 | if (error) { |
57fe60df JM |
79 | sec->name = NULL; |
80 | sec->value = NULL; | |
81 | sec->length = 0; | |
82 | return error; | |
83 | } | |
84 | ||
6cb4aff0 | 85 | if (sec->length && reiserfs_xattrs_initialized(inode->i_sb)) { |
57fe60df JM |
86 | blocks = reiserfs_xattr_jcreate_nblocks(inode) + |
87 | reiserfs_xattr_nblocks(inode, sec->length); | |
88 | /* We don't want to count the directories twice if we have | |
89 | * a default ACL. */ | |
90 | REISERFS_I(inode)->i_flags |= i_has_xattr_dir; | |
91 | } | |
92 | return blocks; | |
93 | } | |
94 | ||
95 | int reiserfs_security_write(struct reiserfs_transaction_handle *th, | |
96 | struct inode *inode, | |
97 | struct reiserfs_security_handle *sec) | |
98 | { | |
d82dcd9e | 99 | char xattr_name[XATTR_NAME_MAX + 1] = XATTR_SECURITY_PREFIX; |
57fe60df | 100 | int error; |
d82dcd9e RS |
101 | |
102 | if (XATTR_SECURITY_PREFIX_LEN + strlen(sec->name) > XATTR_NAME_MAX) | |
57fe60df JM |
103 | return -EINVAL; |
104 | ||
d82dcd9e RS |
105 | strlcat(xattr_name, sec->name, sizeof(xattr_name)); |
106 | ||
107 | error = reiserfs_xattr_set_handle(th, inode, xattr_name, sec->value, | |
57fe60df JM |
108 | sec->length, XATTR_CREATE); |
109 | if (error == -ENODATA || error == -EOPNOTSUPP) | |
110 | error = 0; | |
111 | ||
112 | return error; | |
113 | } | |
114 | ||
115 | void reiserfs_security_free(struct reiserfs_security_handle *sec) | |
116 | { | |
57fe60df JM |
117 | kfree(sec->value); |
118 | sec->name = NULL; | |
119 | sec->value = NULL; | |
120 | } | |
121 | ||
94d09a98 | 122 | const struct xattr_handler reiserfs_xattr_security_handler = { |
1da177e4 LT |
123 | .prefix = XATTR_SECURITY_PREFIX, |
124 | .get = security_get, | |
125 | .set = security_set, | |
1da177e4 LT |
126 | .list = security_list, |
127 | }; |