From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-6.8 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id DE8AEC352BE for ; Thu, 16 Apr 2020 15:38:01 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id BBCC22223D for ; Thu, 16 Apr 2020 15:38:01 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1587051481; bh=cOdDWYDw+GJ+hRmAPg16sAWISZrCcsqiTeYFKrelNr8=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=mV3k0lGNJ1dWNLNiWZYO5lYa7lThQZPl+71f5GlEcJo09bs/nt1SaHxcj3hEUi9JM ebkbnQPTcMN8mg4piZ7D9ZDwwGZ1B+F+/BmEibib4qS1rkyo19eysGzQzWbRtWoiTR gTgaFAm0o/j+Lbwq+gZYcZuycadrH98Tu2SH2WKc= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2395335AbgDPPhx (ORCPT ); Thu, 16 Apr 2020 11:37:53 -0400 Received: from mail.kernel.org ([198.145.29.99]:51530 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2897838AbgDPNjI (ORCPT ); Thu, 16 Apr 2020 09:39:08 -0400 Received: from localhost (83-86-89-107.cable.dynamic.v4.ziggo.nl [83.86.89.107]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id D03E72222D; Thu, 16 Apr 2020 13:39:07 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1587044348; bh=cOdDWYDw+GJ+hRmAPg16sAWISZrCcsqiTeYFKrelNr8=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=yD865DWDkq3aceBvNd3q4956y1idnNkbC6WdrQ1lvXz0J0ZCCwfRMktzq9uRmb/dD RfntW486fgN047NZxiDVw14FcU1U0jle0nfsnFOOw516uF1saQfLqRD7a0wkXvkQ5y 3sBWAM7UUC20zIjzXokH7x96TETBmwTm7maNVXdo= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Mikulas Patocka , Mike Snitzer Subject: [PATCH 5.5 181/257] dm integrity: fix a crash with unusually large tag size Date: Thu, 16 Apr 2020 15:23:52 +0200 Message-Id: <20200416131348.987821940@linuxfoundation.org> X-Mailer: git-send-email 2.26.1 In-Reply-To: <20200416131325.891903893@linuxfoundation.org> References: <20200416131325.891903893@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Mikulas Patocka commit b93b6643e9b5a7f260b931e97f56ffa3fa65e26d upstream. If the user specifies tag size larger than HASH_MAX_DIGESTSIZE, there's a crash in integrity_metadata(). Cc: stable@vger.kernel.org Signed-off-by: Mikulas Patocka Signed-off-by: Mike Snitzer Signed-off-by: Greg Kroah-Hartman --- drivers/md/dm-integrity.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) --- a/drivers/md/dm-integrity.c +++ b/drivers/md/dm-integrity.c @@ -1519,7 +1519,7 @@ static void integrity_metadata(struct wo struct bio *bio = dm_bio_from_per_bio_data(dio, sizeof(struct dm_integrity_io)); char *checksums; unsigned extra_space = unlikely(digest_size > ic->tag_size) ? digest_size - ic->tag_size : 0; - char checksums_onstack[HASH_MAX_DIGESTSIZE]; + char checksums_onstack[max((size_t)HASH_MAX_DIGESTSIZE, MAX_TAG_SIZE)]; unsigned sectors_to_process = dio->range.n_sectors; sector_t sector = dio->range.logical_sector; @@ -1748,7 +1748,7 @@ retry_kmap: } while (++s < ic->sectors_per_block); #ifdef INTERNAL_VERIFY if (ic->internal_hash) { - char checksums_onstack[max(HASH_MAX_DIGESTSIZE, MAX_TAG_SIZE)]; + char checksums_onstack[max((size_t)HASH_MAX_DIGESTSIZE, MAX_TAG_SIZE)]; integrity_sector_checksum(ic, logical_sector, mem + bv.bv_offset, checksums_onstack); if (unlikely(memcmp(checksums_onstack, journal_entry_tag(ic, je), ic->tag_size))) {