From owner-dev-commits-src-branches@freebsd.org Fri Apr 9 05:08:48 2021 Return-Path: Delivered-To: dev-commits-src-branches@mailman.nyi.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1]) by mailman.nyi.freebsd.org (Postfix) with ESMTP id 14C535CB783; Fri, 9 Apr 2021 05:08:48 +0000 (UTC) (envelope-from git@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) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256 client-signature RSA-PSS (4096 bits) client-digest SHA256) (Client CN "mxrelay.nyi.freebsd.org", Issuer "R3" (verified OK)) by mx1.freebsd.org (Postfix) with ESMTPS id 4FGmPW6Rjcz3nr8; Fri, 9 Apr 2021 05:08:47 +0000 (UTC) (envelope-from git@FreeBSD.org) Received: from gitrepo.freebsd.org (gitrepo.freebsd.org [IPv6:2610:1c1:1:6068::e6a:5]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256) (Client did not present a certificate) by mxrelay.nyi.freebsd.org (Postfix) with ESMTPS id B4B0717CFC; Fri, 9 Apr 2021 05:08:47 +0000 (UTC) (envelope-from git@FreeBSD.org) Received: from gitrepo.freebsd.org ([127.0.1.44]) by gitrepo.freebsd.org (8.16.1/8.16.1) with ESMTP id 13958lTf015891; Fri, 9 Apr 2021 05:08:47 GMT (envelope-from git@gitrepo.freebsd.org) Received: (from git@localhost) by gitrepo.freebsd.org (8.16.1/8.16.1/Submit) id 13958lCl015890; Fri, 9 Apr 2021 05:08:47 GMT (envelope-from git) Date: Fri, 9 Apr 2021 05:08:47 GMT Message-Id: <202104090508.13958lCl015890@gitrepo.freebsd.org> To: src-committers@FreeBSD.org, dev-commits-src-all@FreeBSD.org, dev-commits-src-branches@FreeBSD.org From: Konstantin Belousov Subject: git: ecc571a85858 - stable/12 - nullfs: protect against user creating inconsistent state MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 8bit X-Git-Committer: kib X-Git-Repository: src X-Git-Refname: refs/heads/stable/12 X-Git-Reftype: branch X-Git-Commit: ecc571a858586e7b62cae3794c0f6250a91a483b Auto-Submitted: auto-generated X-BeenThere: dev-commits-src-branches@freebsd.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: Commits to the stable branches of the FreeBSD src repository List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 09 Apr 2021 05:08:48 -0000 The branch stable/12 has been updated by kib: URL: https://cgit.FreeBSD.org/src/commit/?id=ecc571a858586e7b62cae3794c0f6250a91a483b commit ecc571a858586e7b62cae3794c0f6250a91a483b Author: Konstantin Belousov AuthorDate: 2021-04-01 17:42:14 +0000 Commit: Konstantin Belousov CommitDate: 2021-04-09 04:57:37 +0000 nullfs: protect against user creating inconsistent state PR: 253593 (cherry picked from commit 76b1b5ce6d81f66b09be8a20aecd064b65fd6b50) --- sys/fs/nullfs/null_vnops.c | 19 +++++++++++++++---- 1 file changed, 15 insertions(+), 4 deletions(-) diff --git a/sys/fs/nullfs/null_vnops.c b/sys/fs/nullfs/null_vnops.c index b663d8d718d3..62351cd9d832 100644 --- a/sys/fs/nullfs/null_vnops.c +++ b/sys/fs/nullfs/null_vnops.c @@ -376,10 +376,21 @@ null_lookup(struct vop_lookup_args *ap) */ ldvp = NULLVPTOLOWERVP(dvp); vp = lvp = NULL; - KASSERT((ldvp->v_vflag & VV_ROOT) == 0 || - ((dvp->v_vflag & VV_ROOT) != 0 && (flags & ISDOTDOT) == 0), - ("ldvp %p fl %#x dvp %p fl %#x flags %#x", ldvp, ldvp->v_vflag, - dvp, dvp->v_vflag, flags)); + + /* + * Renames in the lower mounts might create an inconsistent + * configuration where lower vnode is moved out of the + * directory tree remounted by our null mount. Do not try to + * handle it fancy, just avoid VOP_LOOKUP() with DOTDOT name + * which cannot be handled by VOP, at least passing over lower + * root. + */ + if ((ldvp->v_vflag & VV_ROOT) != 0 && (flags & ISDOTDOT) != 0) { + KASSERT((dvp->v_vflag & VV_ROOT) == 0, + ("ldvp %p fl %#x dvp %p fl %#x flags %#x", + ldvp, ldvp->v_vflag, dvp, dvp->v_vflag, flags)); + return (ENOENT); + } /* * Hold ldvp. The reference on it, owned by dvp, is lost in