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=-12.8 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH, MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED, USER_AGENT_GIT autolearn=ham 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 A6FB9C55178 for ; Tue, 27 Oct 2020 16:32:02 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 64FF020829 for ; Tue, 27 Oct 2020 16:32:02 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1603816322; bh=j0LIKN0AGws6i/FKT7AeuxpkYYH9yjFN2mAKrtet9CE=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=l+6GCeiDa9PWwv03QtBMzRRXDdljc7g1cKH2YqEuOp4utk/CYDu//Tt5lOvg9tUAN qZ/oicAUcXNkny1tZOXPICIpVH4cQ6rphGvOiHm8Ce1N5j5ea+I1mfJqrkWGcRcLAu hktAjd4CkvQzJER/yfKTratN/TBMVeHKmwWvFfb4= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1780330AbgJ0QcA (ORCPT ); Tue, 27 Oct 2020 12:32:00 -0400 Received: from mail.kernel.org ([198.145.29.99]:51292 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1802549AbgJ0PuA (ORCPT ); Tue, 27 Oct 2020 11:50:00 -0400 Received: from localhost (83-86-74-64.cable.dynamic.v4.ziggo.nl [83.86.74.64]) (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 6DA592065C; Tue, 27 Oct 2020 15:49:59 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1603813800; bh=j0LIKN0AGws6i/FKT7AeuxpkYYH9yjFN2mAKrtet9CE=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=c4fj5hX+ceJQig7FU7q0m5t3SK2kJr6Ed94MhSyjkF8C/5C8T+2+Cbq0VMqkeXquv lAffkytlVLGJ3XBUDSISa6pEAOL4VNmbnawdqOoysSv3L2X/AV8Tb0pIN3Vj/qmLn/ 7x6b1v5AA8OwL3J6MVFpPgu+SPGlmG3OSPBsg9kM= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, syzbot+aed06913f36eff9b544e@syzkaller.appspotmail.com, Rustam Kovhaev , Andrew Morton , Anton Altaparmakov , Linus Torvalds , Sasha Levin Subject: [PATCH 5.9 673/757] ntfs: add check for mft record size in superblock Date: Tue, 27 Oct 2020 14:55:23 +0100 Message-Id: <20201027135522.096590308@linuxfoundation.org> X-Mailer: git-send-email 2.29.1 In-Reply-To: <20201027135450.497324313@linuxfoundation.org> References: <20201027135450.497324313@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Rustam Kovhaev [ Upstream commit 4f8c94022f0bc3babd0a124c0a7dcdd7547bd94e ] Number of bytes allocated for mft record should be equal to the mft record size stored in ntfs superblock as reported by syzbot, userspace might trigger out-of-bounds read by dereferencing ctx->attr in ntfs_attr_find() Reported-by: syzbot+aed06913f36eff9b544e@syzkaller.appspotmail.com Signed-off-by: Rustam Kovhaev Signed-off-by: Andrew Morton Tested-by: syzbot+aed06913f36eff9b544e@syzkaller.appspotmail.com Acked-by: Anton Altaparmakov Link: https://syzkaller.appspot.com/bug?extid=aed06913f36eff9b544e Link: https://lkml.kernel.org/r/20200824022804.226242-1-rkovhaev@gmail.com Signed-off-by: Linus Torvalds Signed-off-by: Sasha Levin --- fs/ntfs/inode.c | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/fs/ntfs/inode.c b/fs/ntfs/inode.c index 9bb9f0952b186..caf563981532b 100644 --- a/fs/ntfs/inode.c +++ b/fs/ntfs/inode.c @@ -1810,6 +1810,12 @@ int ntfs_read_inode_mount(struct inode *vi) brelse(bh); } + if (le32_to_cpu(m->bytes_allocated) != vol->mft_record_size) { + ntfs_error(sb, "Incorrect mft record size %u in superblock, should be %u.", + le32_to_cpu(m->bytes_allocated), vol->mft_record_size); + goto err_out; + } + /* Apply the mst fixups. */ if (post_read_mst_fixup((NTFS_RECORD*)m, vol->mft_record_size)) { /* FIXME: Try to use the $MFTMirr now. */ -- 2.25.1