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// SPDX-License-Identifier: GPL-2.0
/*
* Creating audit records for mapped devices.
*
* Copyright (C) 2021 Fraunhofer AISEC. All rights reserved.
*
* Authors: Michael Weiß <michael.weiss@aisec.fraunhofer.de>
*/
#include <linux/audit.h>
#include <linux/module.h>
#include <linux/device-mapper.h>
#include <linux/bio.h>
#include <linux/blkdev.h>
#include "dm-audit.h"
#include "dm-core.h"
static struct audit_buffer *dm_audit_log_start(int audit_type,
const char *dm_msg_prefix,
const char *op)
{
struct audit_buffer *ab;
if (audit_enabled == AUDIT_OFF)
return NULL;
ab = audit_log_start(audit_context(), GFP_KERNEL, audit_type);
if (unlikely(!ab))
return NULL;
audit_log_format(ab, "module=%s op=%s", dm_msg_prefix, op);
return ab;
}
void dm_audit_log_ti(int audit_type, const char *dm_msg_prefix, const char *op,
struct dm_target *ti, int result)
{
struct audit_buffer *ab = NULL;
struct mapped_device *md = dm_table_get_md(ti->table);
int dev_major = dm_disk(md)->major;
int dev_minor = dm_disk(md)->first_minor;
switch (audit_type) {
case AUDIT_DM_CTRL:
ab = dm_audit_log_start(audit_type, dm_msg_prefix, op);
if (unlikely(!ab))
return;
audit_log_task_info(ab);
audit_log_format(ab, " dev=%d:%d error_msg='%s'", dev_major,
dev_minor, !result ? ti->error : "success");
break;
case AUDIT_DM_EVENT:
ab = dm_audit_log_start(audit_type, dm_msg_prefix, op);
if (unlikely(!ab))
return;
audit_log_format(ab, " dev=%d:%d sector=?", dev_major,
dev_minor);
break;
default: /* unintended use */
return;
}
audit_log_format(ab, " res=%d", result);
audit_log_end(ab);
}
EXPORT_SYMBOL_GPL(dm_audit_log_ti);
void dm_audit_log_bio(const char *dm_msg_prefix, const char *op,
struct bio *bio, sector_t sector, int result)
{
struct audit_buffer *ab;
int dev_major = MAJOR(bio->bi_bdev->bd_dev);
int dev_minor = MINOR(bio->bi_bdev->bd_dev);
ab = dm_audit_log_start(AUDIT_DM_EVENT, dm_msg_prefix, op);
if (unlikely(!ab))
return;
audit_log_format(ab, " dev=%d:%d sector=%llu res=%d",
dev_major, dev_minor, sector, result);
audit_log_end(ab);
}
EXPORT_SYMBOL_GPL(dm_audit_log_bio);
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