From 82bb85998cc9a3d26f6086c80fae7888db3b3fd9 Mon Sep 17 00:00:00 2001 From: Michael Weiß Date: Sat, 4 Sep 2021 11:59:29 +0200 Subject: dm integrity: log audit events for dm-integrity target MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit dm-integrity signals integrity violations by returning I/O errors to user space. To identify integrity violations by a controlling instance, the kernel audit subsystem can be used to emit audit events to user space. We use the new dm-audit submodule allowing to emit audit events on relevant I/O errors. The construction and destruction of integrity device mappings are also relevant for auditing a system. Thus, those events are also logged as audit events. Signed-off-by: Michael Weiß Signed-off-by: Mike Snitzer --- drivers/md/dm-integrity.c | 25 +++++++++++++++++++++---- 1 file changed, 21 insertions(+), 4 deletions(-) (limited to 'drivers/md/dm-integrity.c') diff --git a/drivers/md/dm-integrity.c b/drivers/md/dm-integrity.c index dc03b70f6e65..dd78baf4c7af 100644 --- a/drivers/md/dm-integrity.c +++ b/drivers/md/dm-integrity.c @@ -23,6 +23,8 @@ #include #include +#include "dm-audit.h" + #define DM_MSG_PREFIX "integrity" #define DEFAULT_INTERLEAVE_SECTORS 32768 @@ -539,6 +541,7 @@ static int sb_mac(struct dm_integrity_c *ic, bool wr) } if (memcmp((__u8 *)ic->sb + (1 << SECTOR_SHIFT) - size, result, size)) { dm_integrity_io_error(ic, "superblock mac", -EILSEQ); + dm_audit_log_target(DM_MSG_PREFIX, "mac-superblock", ic->ti, 0); return -EILSEQ; } } @@ -876,8 +879,10 @@ static void rw_section_mac(struct dm_integrity_c *ic, unsigned section, bool wr) if (likely(wr)) memcpy(&js->mac, result + (j * JOURNAL_MAC_PER_SECTOR), JOURNAL_MAC_PER_SECTOR); else { - if (memcmp(&js->mac, result + (j * JOURNAL_MAC_PER_SECTOR), JOURNAL_MAC_PER_SECTOR)) + if (memcmp(&js->mac, result + (j * JOURNAL_MAC_PER_SECTOR), JOURNAL_MAC_PER_SECTOR)) { dm_integrity_io_error(ic, "journal mac", -EILSEQ); + dm_audit_log_target(DM_MSG_PREFIX, "mac-journal", ic->ti, 0); + } } } } @@ -1782,10 +1787,15 @@ again: if (unlikely(r)) { if (r > 0) { char b[BDEVNAME_SIZE]; - DMERR_LIMIT("%s: Checksum failed at sector 0x%llx", bio_devname(bio, b), - (sector - ((r + ic->tag_size - 1) / ic->tag_size))); + sector_t s; + + s = sector - ((r + ic->tag_size - 1) / ic->tag_size); + DMERR_LIMIT("%s: Checksum failed at sector 0x%llx", + bio_devname(bio, b), s); r = -EILSEQ; atomic64_inc(&ic->number_of_mismatches); + dm_audit_log_bio(DM_MSG_PREFIX, "integrity-checksum", + bio, s, 0); } if (likely(checksums != checksums_onstack)) kfree(checksums); @@ -1991,6 +2001,8 @@ retry_kmap: if (unlikely(memcmp(checksums_onstack, journal_entry_tag(ic, je), ic->tag_size))) { DMERR_LIMIT("Checksum failed when reading from journal, at sector 0x%llx", logical_sector); + dm_audit_log_bio(DM_MSG_PREFIX, "journal-checksum", + bio, logical_sector, 0); } } #endif @@ -2534,8 +2546,10 @@ static void do_journal_write(struct dm_integrity_c *ic, unsigned write_start, integrity_sector_checksum(ic, sec + ((l - j) << ic->sb->log2_sectors_per_block), (char *)access_journal_data(ic, i, l), test_tag); - if (unlikely(memcmp(test_tag, journal_entry_tag(ic, je2), ic->tag_size))) + if (unlikely(memcmp(test_tag, journal_entry_tag(ic, je2), ic->tag_size))) { dm_integrity_io_error(ic, "tag mismatch when replaying journal", -EILSEQ); + dm_audit_log_target(DM_MSG_PREFIX, "integrity-replay-journal", ic->ti, 0); + } } journal_entry_set_unused(je2); @@ -4514,9 +4528,11 @@ try_smaller_buffer: if (ic->discard) ti->num_discard_bios = 1; + dm_audit_log_ctr(DM_MSG_PREFIX, ti, 1); return 0; bad: + dm_audit_log_ctr(DM_MSG_PREFIX, ti, 0); dm_integrity_dtr(ti); return r; } @@ -4590,6 +4606,7 @@ static void dm_integrity_dtr(struct dm_target *ti) free_alg(&ic->journal_mac_alg); kfree(ic); + dm_audit_log_dtr(DM_MSG_PREFIX, ti, 1); } static struct target_type integrity_target = { -- cgit