From: "Michael Weiß" <michael.weiss@aisec.fraunhofer.de>
To: michael.weiss@aisec.fraunhofer.de
Cc: Mike Snitzer <snitzer@redhat.com>,
linux-kernel@vger.kernel.org, Eric Paris <eparis@redhat.com>,
linux-raid@vger.kernel.org, Song Liu <song@kernel.org>,
dm-devel@redhat.com, linux-audit@redhat.com,
Alasdair Kergon <agk@redhat.com>
Subject: [PATCH 3/3] dm crypt: log aead integrity violations to audit subsystem
Date: Thu, 12 Aug 2021 16:57:44 +0200 [thread overview]
Message-ID: <20210812145748.4460-4-michael.weiss@aisec.fraunhofer.de> (raw)
In-Reply-To: <20210812145748.4460-1-michael.weiss@aisec.fraunhofer.de>
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 <michael.weiss@aisec.fraunhofer.de>
---
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
--
Linux-audit mailing list
Linux-audit@redhat.com
https://listman.redhat.com/mailman/listinfo/linux-audit
prev parent reply other threads:[~2021-08-12 15:16 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-08-12 14:57 [PATCH 0/3] dm: audit event logging Michael Weiß
2021-08-12 14:57 ` [PATCH 1/3] dm: introduce audit event module for device mapper Michael Weiß
2021-08-12 17:08 ` Casey Schaufler
2021-08-13 6:59 ` Weiß, Michael
2021-08-12 14:57 ` [PATCH 2/3] dm integrity: log audit events for dm-integrity target Michael Weiß
2021-08-12 17:20 ` kernel test robot
2021-08-12 14:57 ` Michael Weiß [this message]
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