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); 85