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-rw-r--r--drivers/md/dm-audit.c84
1 files changed, 84 insertions, 0 deletions
diff --git a/drivers/md/dm-audit.c b/drivers/md/dm-audit.c
new file mode 100644
index 000000000..3049dfe67
--- /dev/null
+++ b/drivers/md/dm-audit.c
@@ -0,0 +1,84 @@
+// 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);