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