From patchwork Thu Feb 29 00:54:54 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Fan Wu X-Patchwork-Id: 13576237 Received: from linux.microsoft.com (linux.microsoft.com [13.77.154.182]) by smtp.subspace.kernel.org (Postfix) with ESMTP id C370F36AEE; Thu, 29 Feb 2024 00:55:23 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=13.77.154.182 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1709168127; cv=none; b=Yk4IoxQ1rKt3KigAyuehdhsgHTo5PXZEOr/MuAD56PrrsGznX79LZ33MM4PuP+ZHsJlEQPKXXrrjk7eeJ2rQH3eaZbPDUccar9s7k2/BdyXT0R2QLAvQEFme4TP5ivQRbDfWJPtDROfgTSkLGDlEpSa6cBo/MpIdz2o1H8ylLZg= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1709168127; c=relaxed/simple; bh=nLFXtzeBcjiMKyMP6dpEwHa6q1zR5t7lNC5xVrWtFS8=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References; b=A/LF5O+REb+/XkdOTY32Zl85PjlNq0m8+Ylf/d9EfrjCxq+2tWZsfflPgwYY17gA5sDkXuszHV6mqF/UvUrGOLlWX/vDxWoKgmLMvGSniQFhNpmZZjBgBWTRI9PxRgeUdiGtI0T/x6Wzw7aXtAWBW76W9eSiEPBDQw8uRXY274M= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.microsoft.com; spf=pass smtp.mailfrom=linux.microsoft.com; dkim=pass (1024-bit key) header.d=linux.microsoft.com header.i=@linux.microsoft.com header.b=akULg1jo; arc=none smtp.client-ip=13.77.154.182 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.microsoft.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=linux.microsoft.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linux.microsoft.com header.i=@linux.microsoft.com header.b="akULg1jo" Received: by linux.microsoft.com (Postfix, from userid 1052) id 1564520B74D7; Wed, 28 Feb 2024 16:55:18 -0800 (PST) DKIM-Filter: OpenDKIM Filter v2.11.0 linux.microsoft.com 1564520B74D7 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux.microsoft.com; s=default; t=1709168119; bh=XBFNFhZO2C2cRsijb6fK7ukrFdTouoAgBmyOuq/elfU=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=akULg1jo9HtuVSFYgZ5rHE30PjIwlaYO8eGr0+bgCMSgRzruoP0iDYZkNCxbB1/3W DAGe4s+Ugn5lUI1avwC6PBE/UyWsljIXqa5zo/+Y8UtoCKpTqdkn1b8KKXCHz9zxBj 267R6svgGCoUuVJERRazmMIXQZZFdBEkp6nWYNpE= 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@lists.linux.dev, audit@vger.kernel.org, linux-kernel@vger.kernel.org, Fan Wu Subject: [RFC PATCH v13 12/20] dm verity: set DM_TARGET_SINGLETON feature flag Date: Wed, 28 Feb 2024 16:54:54 -0800 Message-Id: <1709168102-7677-13-git-send-email-wufan@linux.microsoft.com> X-Mailer: git-send-email 1.8.3.1 In-Reply-To: <1709168102-7677-1-git-send-email-wufan@linux.microsoft.com> References: <1709168102-7677-1-git-send-email-wufan@linux.microsoft.com> Precedence: bulk X-Mailing-List: linux-fscrypt@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: 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. Also from dm_table_get_immutable_target(), it documented that "Immutable target is implicitly a singleton". This patch adds the missing flag, restricting only one dm-verity target per mapped device. Signed-off-by: Fan Wu --- v1-v10: + Not present v11: + Introduced v12: + No changes v13: + No changes --- 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 1b591bfa90d5..a99ef30e45ca 100644 --- a/drivers/md/dm-verity-target.c +++ b/drivers/md/dm-verity-target.c @@ -1559,7 +1559,7 @@ 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, 10, 0}, .module = THIS_MODULE, .ctr = verity_ctr,