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| 1 | /* |
| 2 | * linux/fs/ext3/xattr_security.c |
| 3 | * Handler for storing security labels as extended attributes. |
| 4 | */ |
| 5 | |
| 6 | #include <linux/module.h> |
| 7 | #include <linux/slab.h> |
| 8 | #include <linux/string.h> |
| 9 | #include <linux/fs.h> |
| 10 | #include <linux/ext3_jbd.h> |
| 11 | #include <linux/ext3_fs.h> |
| 12 | #include <linux/security.h> |
| 13 | #include "xattr.h" |
| 14 | |
| 15 | static size_t |
| 16 | ext3_xattr_security_list(struct dentry *dentry, char *list, size_t list_size, |
| 17 | const char *name, size_t name_len, int type) |
| 18 | { |
| 19 | const size_t prefix_len = XATTR_SECURITY_PREFIX_LEN; |
| 20 | const size_t total_len = prefix_len + name_len + 1; |
| 21 | |
| 22 | |
| 23 | if (list && total_len <= list_size) { |
| 24 | memcpy(list, XATTR_SECURITY_PREFIX, prefix_len); |
| 25 | memcpy(list+prefix_len, name, name_len); |
| 26 | list[prefix_len + name_len] = '\0'; |
| 27 | } |
| 28 | return total_len; |
| 29 | } |
| 30 | |
| 31 | static int |
| 32 | ext3_xattr_security_get(struct dentry *dentry, const char *name, |
| 33 | void *buffer, size_t size, int type) |
| 34 | { |
| 35 | if (strcmp(name, "") == 0) |
| 36 | return -EINVAL; |
| 37 | return ext3_xattr_get(dentry->d_inode, EXT3_XATTR_INDEX_SECURITY, |
| 38 | name, buffer, size); |
| 39 | } |
| 40 | |
| 41 | static int |
| 42 | ext3_xattr_security_set(struct dentry *dentry, const char *name, |
| 43 | const void *value, size_t size, int flags, int type) |
| 44 | { |
| 45 | if (strcmp(name, "") == 0) |
| 46 | return -EINVAL; |
| 47 | return ext3_xattr_set(dentry->d_inode, EXT3_XATTR_INDEX_SECURITY, |
| 48 | name, value, size, flags); |
| 49 | } |
| 50 | |
| 51 | int |
| 52 | ext3_init_security(handle_t *handle, struct inode *inode, struct inode *dir, |
| 53 | const struct qstr *qstr) |
| 54 | { |
| 55 | int err; |
| 56 | size_t len; |
| 57 | void *value; |
| 58 | char *name; |
| 59 | |
| 60 | err = security_inode_init_security(inode, dir, qstr, &name, &value, &len); |
| 61 | if (err) { |
| 62 | if (err == -EOPNOTSUPP) |
| 63 | return 0; |
| 64 | return err; |
| 65 | } |
| 66 | err = ext3_xattr_set_handle(handle, inode, EXT3_XATTR_INDEX_SECURITY, |
| 67 | name, value, len, 0); |
| 68 | kfree(name); |
| 69 | kfree(value); |
| 70 | return err; |
| 71 | } |
| 72 | |
| 73 | const struct xattr_handler ext3_xattr_security_handler = { |
| 74 | .prefix = XATTR_SECURITY_PREFIX, |
| 75 | .list = ext3_xattr_security_list, |
| 76 | .get = ext3_xattr_security_get, |
| 77 | .set = ext3_xattr_security_set, |
| 78 | }; |
| 79 |
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Tags:
od-2011-09-04
od-2011-09-18
v2.6.34-rc5
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v3.9
