projects / linux-block.git / blame
| Commit | Line | Data |
|---|---|---|
| 385975dc MS |
1 | // SPDX-License-Identifier: GPL-2.0-only |
| 2 | /* | |
| 3 | * Landlock LSM - Credential hooks | |
| 4 | * | |
| 5 | * Copyright © 2017-2020 Mickaël Salaün <mic@digikod.net> | |
| 6 | * Copyright © 2018-2020 ANSSI | |
| 7 | */ | |
| 8 | ||
| 9 | #include <linux/cred.h> | |
| 10 | #include <linux/lsm_hooks.h> | |
| 11 | ||
| 12 | #include "common.h" | |
| 13 | #include "cred.h" | |
| 14 | #include "ruleset.h" | |
| 15 | #include "setup.h" | |
| 16 | ||
| 17 | static int hook_cred_prepare(struct cred *const new, | |
| 06a1c40a | 18 | const struct cred *const old, const gfp_t gfp) |
| 385975dc MS |
19 | { |
| 20 | struct landlock_ruleset *const old_dom = landlock_cred(old)->domain; | |
| 21 | ||
| 22 | if (old_dom) { | |
| 23 | landlock_get_ruleset(old_dom); | |
| 24 | landlock_cred(new)->domain = old_dom; | |
| 25 | } | |
| 26 | return 0; | |
| 27 | } | |
| 28 | ||
| 29 | static void hook_cred_free(struct cred *const cred) | |
| 30 | { | |
| 31 | struct landlock_ruleset *const dom = landlock_cred(cred)->domain; | |
| 32 | ||
| 33 | if (dom) | |
| 34 | landlock_put_ruleset_deferred(dom); | |
| 35 | } | |
| 36 | ||
| f22f9aaf | 37 | static struct security_hook_list landlock_hooks[] __ro_after_init = { |
| 385975dc MS |
38 | LSM_HOOK_INIT(cred_prepare, hook_cred_prepare), |
| 39 | LSM_HOOK_INIT(cred_free, hook_cred_free), | |
| 40 | }; | |
| 41 | ||
| 42 | __init void landlock_add_cred_hooks(void) | |
| 43 | { | |
| 44 | security_add_hooks(landlock_hooks, ARRAY_SIZE(landlock_hooks), | |
| 06a1c40a | 45 | LANDLOCK_NAME); |
| 385975dc | 46 | } |