From patchwork Wed Oct 4 22:09:38 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Fan Wu X-Patchwork-Id: 13409519 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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id EE565E936F6 for ; Wed, 4 Oct 2023 22:09:57 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S234604AbjJDWJ7 (ORCPT ); Wed, 4 Oct 2023 18:09:59 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:36282 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233516AbjJDWJ5 (ORCPT ); Wed, 4 Oct 2023 18:09:57 -0400 Received: from linux.microsoft.com (linux.microsoft.com [13.77.154.182]) by lindbergh.monkeyblade.net (Postfix) with ESMTP id 80E98DC; Wed, 4 Oct 2023 15:09:54 -0700 (PDT) Received: by linux.microsoft.com (Postfix, from userid 1052) id C517A20B74D6; Wed, 4 Oct 2023 15:09:50 -0700 (PDT) DKIM-Filter: OpenDKIM Filter v2.11.0 linux.microsoft.com C517A20B74D6 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux.microsoft.com; s=default; t=1696457390; bh=cW99n8OXkptGYBwo2lvuMipxJldHT9R48ujQFfMBHAE=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=HlbE3xQQD91xPZObjg/CgUE2QU0zJNs+fz69nDWpG2Pro/oeWXN/aaXplO/MMdwnC flp9VyW+sc5xtgwh7Sv8472Td4ThXyh32Q2LzLtm/FCK7mFyD2as88RP80K0dMVIxo bet1LExMUHKfFUO1fcNWYtbZGl7LrIidZ5H9/AcQ= From: Fan Wu To: corbet@lwn.net, zohar@linux.ibm.com, jmorris@namei.org, serge@hallyn.com, tytso@mit.edu, ebiggers@kernel.org, axboe@kernel.dk, agk@redhat.com, snitzer@kernel.org, eparis@redhat.com, paul@paul-moore.com Cc: linux-doc@vger.kernel.org, linux-integrity@vger.kernel.org, linux-security-module@vger.kernel.org, linux-fscrypt@vger.kernel.org, linux-block@vger.kernel.org, dm-devel@redhat.com, audit@vger.kernel.org, roberto.sassu@huawei.com, linux-kernel@vger.kernel.org, Fan Wu Subject: [RFC PATCH v11 11/19] dm verity: set DM_TARGET_SINGLETON feature flag Date: Wed, 4 Oct 2023 15:09:38 -0700 Message-Id: <1696457386-3010-12-git-send-email-wufan@linux.microsoft.com> X-Mailer: git-send-email 1.8.3.1 In-Reply-To: <1696457386-3010-1-git-send-email-wufan@linux.microsoft.com> References: <1696457386-3010-1-git-send-email-wufan@linux.microsoft.com> Precedence: bulk List-ID: X-Mailing-List: linux-block@vger.kernel.org The device-mapper has a flag to mark targets as singleton, which is a required flag for immutable targets. Without this flag, multiple dm-verity targets can be added to a mapped device, which has no practical use cases and will let dm_table_get_immutable_target return NULL. This patch adds the missing flag, restricting only one dm-verity target per mapped device. Signed-off-by: Fan Wu --- v1-v10: + Not present --- drivers/md/dm-verity-target.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/md/dm-verity-target.c b/drivers/md/dm-verity-target.c index 26adcfea0302..80673b66c194 100644 --- a/drivers/md/dm-verity-target.c +++ b/drivers/md/dm-verity-target.c @@ -1503,7 +1503,7 @@ int dm_verity_get_root_digest(struct dm_target *ti, u8 **root_digest, unsigned i static struct target_type verity_target = { .name = "verity", - .features = DM_TARGET_IMMUTABLE, + .features = DM_TARGET_SINGLETON | DM_TARGET_IMMUTABLE, .version = {1, 9, 0}, .module = THIS_MODULE, .ctr = verity_ctr,