| 1 | // SPDX-License-Identifier: GPL-2.0 |
| 2 | /* |
| 3 | * linux/fs/ext4/xattr_security.c |
| 4 | * Handler for storing security labels as extended attributes. |
| 5 | */ |
| 6 | |
| 7 | #include <linux/string.h> |
| 8 | #include <linux/fs.h> |
| 9 | #include <linux/security.h> |
| 10 | #include <linux/slab.h> |
| 11 | #include "ext4_jbd2.h" |
| 12 | #include "ext4.h" |
| 13 | #include "xattr.h" |
| 14 | |
| 15 | static int |
| 16 | ext4_xattr_security_get(const struct xattr_handler *handler, |
| 17 | struct dentry *unused, struct inode *inode, |
| 18 | const char *name, void *buffer, size_t size) |
| 19 | { |
| 20 | return ext4_xattr_get(inode, EXT4_XATTR_INDEX_SECURITY, |
| 21 | name, buffer, size); |
| 22 | } |
| 23 | |
| 24 | static int |
| 25 | ext4_xattr_security_set(const struct xattr_handler *handler, |
| 26 | struct dentry *unused, struct inode *inode, |
| 27 | const char *name, const void *value, |
| 28 | size_t size, int flags) |
| 29 | { |
| 30 | return ext4_xattr_set(inode, EXT4_XATTR_INDEX_SECURITY, |
| 31 | name, value, size, flags); |
| 32 | } |
| 33 | |
| 34 | static int |
| 35 | ext4_initxattrs(struct inode *inode, const struct xattr *xattr_array, |
| 36 | void *fs_info) |
| 37 | { |
| 38 | const struct xattr *xattr; |
| 39 | handle_t *handle = fs_info; |
| 40 | int err = 0; |
| 41 | |
| 42 | for (xattr = xattr_array; xattr->name != NULL; xattr++) { |
| 43 | err = ext4_xattr_set_handle(handle, inode, |
| 44 | EXT4_XATTR_INDEX_SECURITY, |
| 45 | xattr->name, xattr->value, |
| 46 | xattr->value_len, 0); |
| 47 | if (err < 0) |
| 48 | break; |
| 49 | } |
| 50 | return err; |
| 51 | } |
| 52 | |
| 53 | int |
| 54 | ext4_init_security(handle_t *handle, struct inode *inode, struct inode *dir, |
| 55 | const struct qstr *qstr) |
| 56 | { |
| 57 | return security_inode_init_security(inode, dir, qstr, |
| 58 | &ext4_initxattrs, handle); |
| 59 | } |
| 60 | |
| 61 | const struct xattr_handler ext4_xattr_security_handler = { |
| 62 | .prefix = XATTR_SECURITY_PREFIX, |
| 63 | .get = ext4_xattr_security_get, |
| 64 | .set = ext4_xattr_security_set, |
| 65 | }; |