From patchwork Fri May 20 14:26:04 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Thore Sommer X-Patchwork-Id: 12856870 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.133.124]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id DC9C7C433EF for ; Fri, 20 May 2022 14:26:34 +0000 (UTC) Received: from mimecast-mx02.redhat.com (mimecast-mx02.redhat.com [66.187.233.88]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id us-mta-584-YkEQ6rtOOVKgvuOrBxeR1w-1; Fri, 20 May 2022 10:26:32 -0400 X-MC-Unique: YkEQ6rtOOVKgvuOrBxeR1w-1 Received: from smtp.corp.redhat.com (int-mx03.intmail.prod.int.rdu2.redhat.com [10.11.54.3]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id A51C0100B8CB; Fri, 20 May 2022 14:26:30 +0000 (UTC) Received: from mm-prod-listman-01.mail-001.prod.us-east-1.aws.redhat.com (unknown [10.30.29.100]) by smtp.corp.redhat.com (Postfix) with ESMTP id 93F3E1121319; Fri, 20 May 2022 14:26:30 +0000 (UTC) Received: from mm-prod-listman-01.mail-001.prod.us-east-1.aws.redhat.com (localhost [IPv6:::1]) by mm-prod-listman-01.mail-001.prod.us-east-1.aws.redhat.com (Postfix) with ESMTP id 728E4194705A; Fri, 20 May 2022 14:26:30 +0000 (UTC) Received: from smtp.corp.redhat.com (int-mx06.intmail.prod.int.rdu2.redhat.com [10.11.54.6]) by mm-prod-listman-01.mail-001.prod.us-east-1.aws.redhat.com (Postfix) with ESMTP id 493F0194975B for ; Fri, 20 May 2022 14:26:27 +0000 (UTC) Received: by smtp.corp.redhat.com (Postfix) id 3B5E82166B2F; Fri, 20 May 2022 14:26:27 +0000 (UTC) Received: from mimecast-mx02.redhat.com (mimecast05.extmail.prod.ext.rdu2.redhat.com [10.11.55.21]) by smtp.corp.redhat.com (Postfix) with ESMTPS id 377662166B25 for ; Fri, 20 May 2022 14:26:27 +0000 (UTC) Received: from us-smtp-1.mimecast.com (us-smtp-delivery-1.mimecast.com [205.139.110.120]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id 1C6E180A0B9 for ; Fri, 20 May 2022 14:26:27 +0000 (UTC) Received: from mo4-p01-ob.smtp.rzone.de (mo4-p01-ob.smtp.rzone.de [85.215.255.53]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id us-mta-172-ZxpMs9HcNU-fvalJmycC1w-1; Fri, 20 May 2022 10:26:25 -0400 X-MC-Unique: ZxpMs9HcNU-fvalJmycC1w-1 X-RZG-AUTH: ":PHkGeUmrW+uCZmxs998QJRUX30nOwJd7nOD9sw/xoauycprg5uef7cgCEpy7sPc=" X-RZG-CLASS-ID: mo00 Received: from USER-PC.fritz.box by smtp.strato.de (RZmta 47.42.2 DYNA|AUTH) with ESMTPSA id Y03eaey4KEQHQD6 (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256 bits)) (Client did not present a certificate); Fri, 20 May 2022 16:26:17 +0200 (CEST) From: Thore Sommer To: dm-devel@redhat.com, agk@redhat.com, snitzer@redhat.com, nramas@linux.microsoft.com Date: Fri, 20 May 2022 16:26:04 +0200 Message-Id: <20220520142605.270625-3-public@thson.de> In-Reply-To: <20220520142605.270625-1-public@thson.de> References: <20220520142605.270625-1-public@thson.de> MIME-Version: 1.0 X-Mimecast-Impersonation-Protect: Policy=CLT - Impersonation Protection Definition; Similar Internal Domain=false; Similar Monitored External Domain=false; Custom External Domain=false; Mimecast External Domain=false; Newly Observed Domain=false; Internal User Name=false; Custom Display Name List=false; Reply-to Address Mismatch=false; Targeted Threat Dictionary=false; Mimecast Threat Dictionary=false; Custom Threat Dictionary=false X-Scanned-By: MIMEDefang 2.78 on 10.11.54.6 Subject: [dm-devel] [PATCH 2/3] dm verity: add support for IMA target update event X-BeenThere: dm-devel@redhat.com X-Mailman-Version: 2.1.29 Precedence: list List-Id: device-mapper development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: linux-integrity@vger.kernel.org, Thore Sommer Errors-To: dm-devel-bounces@redhat.com Sender: "dm-devel" X-Scanned-By: MIMEDefang 2.78 on 10.11.54.3 Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=CUSA124A263 smtp.mailfrom=dm-devel-bounces@redhat.com X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com On first corruption the verity targets triggers a "dm_target_update" event. This allows other systems to detect the corruption via IMA instead of manually querying the table. The corruption cannot be detected using the other IMA measurements because "dm_table_load" only measures the table content during target creation. Using the new "dm_target_update" remeasures the target table entries during runtime. The event is only triggered if the target was not corrupted before because verity_handle_err(..) is still called when the target is corrupted and the IMA log should only contain an entry when the table changed. Signed-off-by: Thore Sommer --- - v1: rewrite check to not use an extra variable drivers/md/dm-verity-target.c | 10 ++++++++-- 1 file changed, 8 insertions(+), 2 deletions(-) diff --git a/drivers/md/dm-verity-target.c b/drivers/md/dm-verity-target.c index 80133aae0db3..5133c2274057 100644 --- a/drivers/md/dm-verity-target.c +++ b/drivers/md/dm-verity-target.c @@ -16,6 +16,7 @@ #include "dm-verity.h" #include "dm-verity-fec.h" #include "dm-verity-verify-sig.h" +#include "dm-ima.h" #include #include #include @@ -219,8 +220,13 @@ static int verity_handle_err(struct dm_verity *v, enum verity_block_type type, const char *type_str = ""; struct mapped_device *md = dm_table_get_md(v->ti->table); - /* Corruption should be visible in device status in all modes */ - v->hash_failed = 1; + /* Only change and measure change if not already corrupted */ + if (!v->hash_failed) { + /* Corruption should be visible in device status in all modes */ + v->hash_failed = 1; + /* After the state has changed remeasure target table */ + dm_ima_measure_on_target_update(v->ti); + } if (v->corrupted_errs >= DM_VERITY_MAX_CORRUPTED_ERRS) goto out;