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=-5.5 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, USER_AGENT_SANE_1 autolearn=no 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 3841AC433E1 for ; Sun, 12 Jul 2020 21:03:02 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 1B5B020674 for ; Sun, 12 Jul 2020 21:03:02 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729455AbgGLVCw (ORCPT ); Sun, 12 Jul 2020 17:02:52 -0400 Received: from jabberwock.ucw.cz ([46.255.230.98]:59304 "EHLO jabberwock.ucw.cz" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729020AbgGLVCw (ORCPT ); Sun, 12 Jul 2020 17:02:52 -0400 Received: by jabberwock.ucw.cz (Postfix, from userid 1017) id 100401C0BE0; Sun, 12 Jul 2020 23:02:50 +0200 (CEST) Date: Sun, 12 Jul 2020 23:02:43 +0200 From: Pavel Machek To: "Eric W. Biederman" Cc: linux-kernel@vger.kernel.org, David Miller , Greg Kroah-Hartman , Tetsuo Handa , Alexei Starovoitov , Kees Cook , Andrew Morton , Alexei Starovoitov , Al Viro , bpf , linux-fsdevel , Daniel Borkmann , Jakub Kicinski , Masahiro Yamada , Gary Lin , Bruno Meneguele , LSM List , Casey Schaufler , Luis Chamberlain , Linus Torvalds , Christian Brauner , Greg Kroah-Hartman Subject: Re: [PATCH v3 10/16] exec: Remove do_execve_file Message-ID: <20200712210243.GB983@bug> References: <87y2o1swee.fsf_-_@x220.int.ebiederm.org> <20200702164140.4468-10-ebiederm@xmission.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20200702164140.4468-10-ebiederm@xmission.com> User-Agent: Mutt/1.5.23 (2014-03-12) Sender: owner-linux-security-module@vger.kernel.org Precedence: bulk List-ID: On Thu 2020-07-02 11:41:34, Eric W. Biederman wrote: > Now that the last callser has been removed remove this code from exec. Typo "caller". > For anyone thinking of resurrecing do_execve_file please note that resurrecting? > the code was buggy in several fundamental ways. > > - It did not ensure the file it was passed was read-only and that > deny_write_access had been called on it. Which subtlely breaks > invaniants in exec. subtly, invariants? Pavel -- (english) http://www.livejournal.com/~pavelmachek (cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html