[PATCH 3/3] dm crypt: log aead integrity violations to audit subsystem
From: Michael Weiß <hidden>
Date: 2021-08-12 14:58:37
Also in:
dm-devel, lkml
Subsystem:
device-mapper (lvm), the rest · Maintainers:
Alasdair Kergon, Mike Snitzer, Mikulas Patocka, Benjamin Marzinski, Linus Torvalds
Since dm-crypt target can be stacked on dm-integrity targets to provide authenticated encryption, integrity violations are recognized here during aead computation. We use the dm-audit submodule to signal those events to user space, too. The construction and destruction of crypt device mappings are also logged as audit events. Signed-off-by: Michael Weiß <redacted> --- drivers/md/dm-crypt.c | 23 +++++++++++++++++++---- 1 file changed, 19 insertions(+), 4 deletions(-)
diff --git a/drivers/md/dm-crypt.c b/drivers/md/dm-crypt.c
index 50f4cbd600d5..343aef4dcf5e 100644
--- a/drivers/md/dm-crypt.c
+++ b/drivers/md/dm-crypt.c@@ -41,6 +41,8 @@ #include <linux/device-mapper.h> +#include "dm-audit.h" + #define DM_MSG_PREFIX "crypt" /*
@@ -1122,6 +1124,7 @@ static bool crypt_integrity_hmac(struct crypt_config *cc) return crypt_integrity_aead(cc) && cc->key_mac_size; } + /* Get sg containing data */ static struct scatterlist *crypt_get_sg_data(struct crypt_config *cc, struct scatterlist *sg)
@@ -1362,8 +1365,12 @@ static int crypt_convert_block_aead(struct crypt_config *cc, if (r == -EBADMSG) { char b[BDEVNAME_SIZE]; - DMERR_LIMIT("%s: INTEGRITY AEAD ERROR, sector %llu", bio_devname(ctx->bio_in, b), - (unsigned long long)le64_to_cpu(*sector)); + sector_t s = le64_to_cpu(*sector); + + DMERR_LIMIT("%s: INTEGRITY AEAD ERROR, sector %llu", + bio_devname(ctx->bio_in, b), s); + dm_audit_log_bio(DM_MSG_PREFIX, "integrity-aead", + ctx->bio_in, s, 0); } if (!r && cc->iv_gen_ops && cc->iv_gen_ops->post)
@@ -2173,8 +2180,12 @@ static void kcryptd_async_done(struct crypto_async_request *async_req, if (error == -EBADMSG) { char b[BDEVNAME_SIZE]; - DMERR_LIMIT("%s: INTEGRITY AEAD ERROR, sector %llu", bio_devname(ctx->bio_in, b), - (unsigned long long)le64_to_cpu(*org_sector_of_dmreq(cc, dmreq))); + sector_t s = le64_to_cpu(*org_sector_of_dmreq(cc, dmreq)); + + DMERR_LIMIT("%s: INTEGRITY AEAD ERROR, sector %llu", + bio_devname(ctx->bio_in, b), s); + dm_audit_log_bio(DM_MSG_PREFIX, "integrity-aead", + ctx->bio_in, s, 0); io->error = BLK_STS_PROTECTION; } else if (error < 0) io->error = BLK_STS_IOERR;
@@ -2729,6 +2740,8 @@ static void crypt_dtr(struct dm_target *ti) dm_crypt_clients_n--; crypt_calculate_pages_per_client(); spin_unlock(&dm_crypt_clients_lock); + + dm_audit_log_target(DM_MSG_PREFIX, "dtr", ti, 1); } static int crypt_ctr_ivmode(struct dm_target *ti, const char *ivmode)
@@ -3357,9 +3370,11 @@ static int crypt_ctr(struct dm_target *ti, unsigned int argc, char **argv) ti->num_flush_bios = 1; ti->limit_swap_bios = true; + dm_audit_log_target(DM_MSG_PREFIX, "ctr", ti, 1); return 0; bad: + dm_audit_log_target(DM_MSG_PREFIX, "ctr", ti, 0); crypt_dtr(ti); return ret; }
--
2.20.1