From owner-svn-src-all@freebsd.org Tue Sep 22 21:54:30 2020 Return-Path: Delivered-To: svn-src-all@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 B76513E0E43; Tue, 22 Sep 2020 21:54:30 +0000 (UTC) (envelope-from kib@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 "Let's Encrypt Authority X3" (verified OK)) by mx1.freebsd.org (Postfix) with ESMTPS id 4Bww7p4V3rz3VJ1; Tue, 22 Sep 2020 21:54:30 +0000 (UTC) (envelope-from kib@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 7D8252613D; Tue, 22 Sep 2020 21:54:30 +0000 (UTC) (envelope-from kib@FreeBSD.org) Received: from repo.freebsd.org ([127.0.1.37]) by repo.freebsd.org (8.15.2/8.15.2) with ESMTP id 08MLsUNM035152; Tue, 22 Sep 2020 21:54:30 GMT (envelope-from kib@FreeBSD.org) Received: (from kib@localhost) by repo.freebsd.org (8.15.2/8.15.2/Submit) id 08MLsU5m035151; Tue, 22 Sep 2020 21:54:30 GMT (envelope-from kib@FreeBSD.org) Message-Id: <202009222154.08MLsU5m035151@repo.freebsd.org> X-Authentication-Warning: repo.freebsd.org: kib set sender to kib@FreeBSD.org using -f From: Konstantin Belousov Date: Tue, 22 Sep 2020 21:54:30 +0000 (UTC) To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r366015 - head/sys/kern X-SVN-Group: head X-SVN-Commit-Author: kib X-SVN-Commit-Paths: head/sys/kern X-SVN-Commit-Revision: 366015 X-SVN-Commit-Repository: base MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-BeenThere: svn-src-all@freebsd.org X-Mailman-Version: 2.1.33 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: Tue, 22 Sep 2020 21:54:30 -0000 Author: kib Date: Tue Sep 22 21:54:30 2020 New Revision: 366015 URL: https://svnweb.freebsd.org/changeset/base/366015 Log: Improve comment above nameicap_check_dotdot(). Explain why tracker is needed at all. Reviewed by: markj Tested by: pho Sponsored by: The FreeBSD Foundation MFC after: 1 week Differential revision: https://reviews.freebsd.org/D25886 Modified: head/sys/kern/vfs_lookup.c Modified: head/sys/kern/vfs_lookup.c ============================================================================== --- head/sys/kern/vfs_lookup.c Tue Sep 22 21:43:43 2020 (r366014) +++ head/sys/kern/vfs_lookup.c Tue Sep 22 21:54:30 2020 (r366015) @@ -215,7 +215,11 @@ nameicap_cleanup(struct nameidata *ndp, bool clean_lat /* * For dotdot lookups in capability mode, only allow the component * lookup to succeed if the resulting directory was already traversed - * during the operation. Also fail dotdot lookups for non-local + * during the operation. This catches situations where already + * traversed directory is moved to different parent, and then we walk + * over it with dotdots. + * + * Also allow to force failure of dotdot lookups for non-local * filesystems, where external agents might assist local lookups to * escape the compartment. */