From owner-svn-src-stable@freebsd.org Mon Jan 28 02:12:49 2019 Return-Path: Delivered-To: svn-src-stable@mailman.ysv.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1]) by mailman.ysv.freebsd.org (Postfix) with ESMTP id DED2B14C5653; Mon, 28 Jan 2019 02:12:48 +0000 (UTC) (envelope-from pfg@FreeBSD.org) Received: from mxrelay.nyi.freebsd.org (mxrelay.nyi.freebsd.org [IPv6:2610:1c1:1:606c::19:3]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) server-signature RSA-PSS (4096 bits) client-signature RSA-PSS (4096 bits) client-digest SHA256) (Client CN "mxrelay.nyi.freebsd.org", Issuer "Let's Encrypt Authority X3" (verified OK)) by mx1.freebsd.org (Postfix) with ESMTPS id 845626A6D7; Mon, 28 Jan 2019 02:12:48 +0000 (UTC) (envelope-from pfg@FreeBSD.org) Received: from repo.freebsd.org (repo.freebsd.org [IPv6:2610:1c1:1:6068::e6a:0]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client did not present a certificate) by mxrelay.nyi.freebsd.org (Postfix) with ESMTPS id 7AF0618F3E; Mon, 28 Jan 2019 02:12:48 +0000 (UTC) (envelope-from pfg@FreeBSD.org) Received: from repo.freebsd.org ([127.0.1.37]) by repo.freebsd.org (8.15.2/8.15.2) with ESMTP id x0S2Cmf4016741; Mon, 28 Jan 2019 02:12:48 GMT (envelope-from pfg@FreeBSD.org) Received: (from pfg@localhost) by repo.freebsd.org (8.15.2/8.15.2/Submit) id x0S2CmJ2016740; Mon, 28 Jan 2019 02:12:48 GMT (envelope-from pfg@FreeBSD.org) Message-Id: <201901280212.x0S2CmJ2016740@repo.freebsd.org> X-Authentication-Warning: repo.freebsd.org: pfg set sender to pfg@FreeBSD.org using -f From: "Pedro F. Giffuni" Date: Mon, 28 Jan 2019 02:12:48 +0000 (UTC) To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-stable@freebsd.org, svn-src-stable-11@freebsd.org Subject: svn commit: r343517 - stable/11/sys/fs/ext2fs X-SVN-Group: stable-11 X-SVN-Commit-Author: pfg X-SVN-Commit-Paths: stable/11/sys/fs/ext2fs X-SVN-Commit-Revision: 343517 X-SVN-Commit-Repository: base MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-Rspamd-Queue-Id: 845626A6D7 X-Spamd-Bar: -- Authentication-Results: mx1.freebsd.org X-Spamd-Result: default: False [-2.94 / 15.00]; local_wl_from(0.00)[FreeBSD.org]; NEURAL_HAM_MEDIUM(-1.00)[-0.998,0]; NEURAL_HAM_LONG(-1.00)[-0.999,0]; NEURAL_HAM_SHORT(-0.94)[-0.945,0]; ASN(0.00)[asn:11403, ipnet:2610:1c1:1::/48, country:US] X-BeenThere: svn-src-stable@freebsd.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: SVN commit messages for all the -stable branches of the src tree List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 28 Jan 2019 02:12:49 -0000 Author: pfg Date: Mon Jan 28 02:12:48 2019 New Revision: 343517 URL: https://svnweb.freebsd.org/changeset/base/343517 Log: MFC r343459: (parcial) ext2fs: Add some extra consistency checks for the superblock. Maliciously formed, or badly corrupted, filesystems can cause kernel panics. In general, such acts of foot-shooting can only be accomplished by root, but in a world with VM images that is moving towards automated mounts it is important to have some form of prevention. Reported by: Christopher Krah, Thomas Barabosch, and Jan-Niclas Hilgert of Fraunhofer FKIE. Incidentaly this should also fix a memory corruption issue reported by Dr Silvio Cesare of InfoSect. Huge thanks to all reseachers for making us aware of the issue. Note: for the MFC to stable/11 several changes had to made. admbug: 872, 891 Reviewed by: fsu Obtained from: NetBSD (with changes) Modified: stable/11/sys/fs/ext2fs/ext2_vfsops.c Directory Properties: stable/11/ (props changed) Modified: stable/11/sys/fs/ext2fs/ext2_vfsops.c ============================================================================== --- stable/11/sys/fs/ext2fs/ext2_vfsops.c Mon Jan 28 02:00:39 2019 (r343516) +++ stable/11/sys/fs/ext2fs/ext2_vfsops.c Mon Jan 28 02:12:48 2019 (r343517) @@ -369,8 +369,27 @@ compute_sb_data(struct vnode *devvp, struct ext2fs *es es->e3fs_desc_size); return (EINVAL); } + /* Check for block size = 1K|2K|4K */ + if (es->e2fs_log_bsize > 2) { + printf("ext2fs: bad block size: %d\n", es->e2fs_log_bsize); + return (EINVAL); + } + /* Check for group size */ + if (fs->e2fs_bpg == 0) { + printf("ext2fs: zero blocks per group\n"); + return (EINVAL); + } + if (fs->e2fs_bpg != fs->e2fs_bsize * 8) { + printf("ext2fs: non-standard group size unsupported %d\n", + fs->e2fs_bpg); + return (EINVAL); + } fs->e2fs_ipb = fs->e2fs_bsize / EXT2_INODE_SIZE(fs); + if (fs->e2fs_ipg == 0) { + printf("ext2fs: zero inodes per group\n"); + return (EINVAL); + } fs->e2fs_itpg = fs->e2fs_ipg / fs->e2fs_ipb; /* s_resuid / s_resgid ? */ fs->e2fs_gcount = howmany(es->e2fs_bcount - es->e2fs_first_dblock,