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2cc1ae48 MW |
1 | // SPDX-License-Identifier: GPL-2.0 |
2 | /* | |
3 | * Creating audit records for mapped devices. | |
4 | * | |
5 | * Copyright (C) 2021 Fraunhofer AISEC. All rights reserved. | |
6 | * | |
7 | * Authors: Michael Weiß <michael.weiss@aisec.fraunhofer.de> | |
8 | */ | |
9 | ||
10 | #include <linux/audit.h> | |
11 | #include <linux/module.h> | |
12 | #include <linux/device-mapper.h> | |
13 | #include <linux/bio.h> | |
14 | #include <linux/blkdev.h> | |
15 | ||
16 | #include "dm-audit.h" | |
17 | #include "dm-core.h" | |
18 | ||
19 | static struct audit_buffer *dm_audit_log_start(int audit_type, | |
20 | const char *dm_msg_prefix, | |
21 | const char *op) | |
22 | { | |
23 | struct audit_buffer *ab; | |
24 | ||
25 | if (audit_enabled == AUDIT_OFF) | |
26 | return NULL; | |
27 | ||
28 | ab = audit_log_start(audit_context(), GFP_KERNEL, audit_type); | |
29 | if (unlikely(!ab)) | |
30 | return NULL; | |
31 | ||
32 | audit_log_format(ab, "module=%s op=%s", dm_msg_prefix, op); | |
33 | return ab; | |
34 | } | |
35 | ||
36 | void dm_audit_log_ti(int audit_type, const char *dm_msg_prefix, const char *op, | |
37 | struct dm_target *ti, int result) | |
38 | { | |
39 | struct audit_buffer *ab = NULL; | |
40 | struct mapped_device *md = dm_table_get_md(ti->table); | |
41 | int dev_major = dm_disk(md)->major; | |
42 | int dev_minor = dm_disk(md)->first_minor; | |
43 | ||
44 | switch (audit_type) { | |
45 | case AUDIT_DM_CTRL: | |
46 | ab = dm_audit_log_start(audit_type, dm_msg_prefix, op); | |
47 | if (unlikely(!ab)) | |
48 | return; | |
49 | audit_log_task_info(ab); | |
50 | audit_log_format(ab, " dev=%d:%d error_msg='%s'", dev_major, | |
51 | dev_minor, !result ? ti->error : "success"); | |
52 | break; | |
53 | case AUDIT_DM_EVENT: | |
54 | ab = dm_audit_log_start(audit_type, dm_msg_prefix, op); | |
55 | if (unlikely(!ab)) | |
56 | return; | |
57 | audit_log_format(ab, " dev=%d:%d sector=?", dev_major, | |
58 | dev_minor); | |
59 | break; | |
60 | default: /* unintended use */ | |
61 | return; | |
62 | } | |
63 | ||
64 | audit_log_format(ab, " res=%d", result); | |
65 | audit_log_end(ab); | |
66 | } | |
67 | EXPORT_SYMBOL_GPL(dm_audit_log_ti); | |
68 | ||
69 | void dm_audit_log_bio(const char *dm_msg_prefix, const char *op, | |
70 | struct bio *bio, sector_t sector, int result) | |
71 | { | |
72 | struct audit_buffer *ab; | |
73 | int dev_major = MAJOR(bio->bi_bdev->bd_dev); | |
74 | int dev_minor = MINOR(bio->bi_bdev->bd_dev); | |
75 | ||
76 | ab = dm_audit_log_start(AUDIT_DM_EVENT, dm_msg_prefix, op); | |
77 | if (unlikely(!ab)) | |
78 | return; | |
79 | ||
80 | audit_log_format(ab, " dev=%d:%d sector=%llu res=%d", | |
81 | dev_major, dev_minor, sector, result); | |
82 | audit_log_end(ab); | |
83 | } | |
84 | EXPORT_SYMBOL_GPL(dm_audit_log_bio); |