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84 lines
2.1 KiB
84 lines
2.1 KiB
// SPDX-License-Identifier: GPL-2.0 |
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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 <[email protected]> |
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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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