From owner-svn-src-all@freebsd.org Wed Mar 6 22:56:50 2019 Return-Path: Delivered-To: svn-src-all@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 373D4152A37A; Wed, 6 Mar 2019 22:56:50 +0000 (UTC) (envelope-from cem@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 C15957539F; Wed, 6 Mar 2019 22:56:49 +0000 (UTC) (envelope-from cem@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 ACD2FA50A; Wed, 6 Mar 2019 22:56:49 +0000 (UTC) (envelope-from cem@FreeBSD.org) Received: from repo.freebsd.org ([127.0.1.37]) by repo.freebsd.org (8.15.2/8.15.2) with ESMTP id x26MunL5054949; Wed, 6 Mar 2019 22:56:49 GMT (envelope-from cem@FreeBSD.org) Received: (from cem@localhost) by repo.freebsd.org (8.15.2/8.15.2/Submit) id x26Munf3054948; Wed, 6 Mar 2019 22:56:49 GMT (envelope-from cem@FreeBSD.org) Message-Id: <201903062256.x26Munf3054948@repo.freebsd.org> X-Authentication-Warning: repo.freebsd.org: cem set sender to cem@FreeBSD.org using -f From: Conrad Meyer Date: Wed, 6 Mar 2019 22:56:49 +0000 (UTC) To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r344857 - head/sys/fs/fuse X-SVN-Group: head X-SVN-Commit-Author: cem X-SVN-Commit-Paths: head/sys/fs/fuse X-SVN-Commit-Revision: 344857 X-SVN-Commit-Repository: base MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-Rspamd-Queue-Id: C15957539F X-Spamd-Bar: -- Authentication-Results: mx1.freebsd.org X-Spamd-Result: default: False [-2.96 / 15.00]; local_wl_from(0.00)[FreeBSD.org]; NEURAL_HAM_MEDIUM(-1.00)[-0.999,0]; NEURAL_HAM_LONG(-1.00)[-1.000,0]; NEURAL_HAM_SHORT(-0.96)[-0.956,0]; ASN(0.00)[asn:11403, ipnet:2610:1c1:1::/48, country:US] X-BeenThere: svn-src-all@freebsd.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: "SVN commit messages for the entire src tree \(except for " user" and " projects" \)" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 06 Mar 2019 22:56:50 -0000 Author: cem Date: Wed Mar 6 22:56:49 2019 New Revision: 344857 URL: https://svnweb.freebsd.org/changeset/base/344857 Log: FUSE: Prevent trivial panic When open(2) was invoked against a FUSE filesystem with an unexpected flags value (no O_RDONLY / O_RDWR / O_WRONLY), an assertion fired, causing panic. For now, prevent the panic by rejecting such VOP_OPENs with EINVAL. This is not considered the correct long term fix, but does prevent an unprivileged denial-of-service. PR: 236329 Reported by: asomers Reviewed by: asomers Sponsored by: Dell EMC Isilon Modified: head/sys/fs/fuse/fuse_vnops.c Modified: head/sys/fs/fuse/fuse_vnops.c ============================================================================== --- head/sys/fs/fuse/fuse_vnops.c Wed Mar 6 22:13:53 2019 (r344856) +++ head/sys/fs/fuse/fuse_vnops.c Wed Mar 6 22:56:49 2019 (r344857) @@ -1174,6 +1174,9 @@ fuse_vnop_open(struct vop_open_args *ap) if (fuse_isdeadfs(vp)) { return ENXIO; } + if ((mode & (FREAD | FWRITE)) == 0) + return EINVAL; + fvdat = VTOFUD(vp); if (vnode_isdir(vp)) {