1 // SPDX-License-Identifier: GPL-2.0-only 1 // SPDX-License-Identifier: GPL-2.0-only
2 /* 2 /*
3 * Landlock LSM - Credential hooks 3 * Landlock LSM - Credential hooks
4 * 4 *
5 * Copyright © 2017-2020 Mickaël Salaün <mi 5 * Copyright © 2017-2020 Mickaël Salaün <mic@digikod.net>
6 * Copyright © 2018-2020 ANSSI 6 * Copyright © 2018-2020 ANSSI
7 */ 7 */
8 8
9 #include <linux/cred.h> 9 #include <linux/cred.h>
10 #include <linux/lsm_hooks.h> 10 #include <linux/lsm_hooks.h>
11 11
12 #include "common.h" 12 #include "common.h"
13 #include "cred.h" 13 #include "cred.h"
14 #include "ruleset.h" 14 #include "ruleset.h"
15 #include "setup.h" 15 #include "setup.h"
16 16
17 static void hook_cred_transfer(struct cred *co 17 static void hook_cred_transfer(struct cred *const new,
18 const struct cr 18 const struct cred *const old)
19 { 19 {
20 struct landlock_ruleset *const old_dom 20 struct landlock_ruleset *const old_dom = landlock_cred(old)->domain;
21 21
22 if (old_dom) { 22 if (old_dom) {
23 landlock_get_ruleset(old_dom); 23 landlock_get_ruleset(old_dom);
24 landlock_cred(new)->domain = o 24 landlock_cred(new)->domain = old_dom;
25 } 25 }
26 } 26 }
27 27
28 static int hook_cred_prepare(struct cred *cons 28 static int hook_cred_prepare(struct cred *const new,
29 const struct cred 29 const struct cred *const old, const gfp_t gfp)
30 { 30 {
31 hook_cred_transfer(new, old); 31 hook_cred_transfer(new, old);
32 return 0; 32 return 0;
33 } 33 }
34 34
35 static void hook_cred_free(struct cred *const 35 static void hook_cred_free(struct cred *const cred)
36 { 36 {
37 struct landlock_ruleset *const dom = l 37 struct landlock_ruleset *const dom = landlock_cred(cred)->domain;
38 38
39 if (dom) 39 if (dom)
40 landlock_put_ruleset_deferred( 40 landlock_put_ruleset_deferred(dom);
41 } 41 }
42 42
43 static struct security_hook_list landlock_hook 43 static struct security_hook_list landlock_hooks[] __ro_after_init = {
44 LSM_HOOK_INIT(cred_prepare, hook_cred_ 44 LSM_HOOK_INIT(cred_prepare, hook_cred_prepare),
45 LSM_HOOK_INIT(cred_transfer, hook_cred 45 LSM_HOOK_INIT(cred_transfer, hook_cred_transfer),
46 LSM_HOOK_INIT(cred_free, hook_cred_fre 46 LSM_HOOK_INIT(cred_free, hook_cred_free),
47 }; 47 };
48 48
49 __init void landlock_add_cred_hooks(void) 49 __init void landlock_add_cred_hooks(void)
50 { 50 {
51 security_add_hooks(landlock_hooks, ARR 51 security_add_hooks(landlock_hooks, ARRAY_SIZE(landlock_hooks),
52 &landlock_lsmid); 52 &landlock_lsmid);
53 } 53 }
54 54
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