From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.io!.POSTED.blaine.gmane.org!not-for-mail From: Eli Zaretskii Newsgroups: gmane.emacs.bugs Subject: bug#45198: 28.0.50; Sandbox mode Date: Sun, 18 Apr 2021 12:23:20 +0300 Message-ID: <83tuo4t08n.fsf@gnu.org> References: <5818DFAA-3A9C-4335-BAAF-1227A02C290A@acm.org> <19511709-E42B-4ABD-9823-39EA08A79B1F@gmail.com> <83v98kvr7y.fsf@gnu.org> <9A5BCDF3-6543-46C0-AB56-2311392FC549@gmail.com> <83tuo4vqet.fsf@gnu.org> <83r1j8vpku.fsf@gnu.org> <83fszovhox.fsf@gnu.org> <8491CEA9-E230-48E4-9AB3-71DF0B4D8A2B@gmail.com> <83czusun95.fsf@gnu.org> Mime-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 8bit Injection-Info: ciao.gmane.io; posting-host="blaine.gmane.org:116.202.254.214"; logging-data="23847"; mail-complaints-to="usenet@ciao.gmane.io" Cc: alan@idiocy.org, mattiase@acm.org, 45198@debbugs.gnu.org, stefankangas@gmail.com, joaotavora@gmail.com, monnier@iro.umontreal.ca To: Philipp Stephani Original-X-From: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane-mx.org@gnu.org Sun Apr 18 11:24:17 2021 Return-path: Envelope-to: geb-bug-gnu-emacs@m.gmane-mx.org Original-Received: from lists.gnu.org ([209.51.188.17]) by ciao.gmane.io with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.92) (envelope-from ) id 1lY3f6-00065Q-Rm for geb-bug-gnu-emacs@m.gmane-mx.org; Sun, 18 Apr 2021 11:24:16 +0200 Original-Received: from localhost ([::1]:35360 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1lY3f5-0008Uv-Nx for geb-bug-gnu-emacs@m.gmane-mx.org; Sun, 18 Apr 2021 05:24:15 -0400 Original-Received: from eggs.gnu.org ([2001:470:142:3::10]:36752) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1lY3es-0008Tm-9H for bug-gnu-emacs@gnu.org; Sun, 18 Apr 2021 05:24:02 -0400 Original-Received: from debbugs.gnu.org ([209.51.188.43]:33758) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.90_1) (envelope-from ) id 1lY3er-0005F9-Qk for bug-gnu-emacs@gnu.org; Sun, 18 Apr 2021 05:24:02 -0400 Original-Received: from Debian-debbugs by debbugs.gnu.org with local (Exim 4.84_2) (envelope-from ) id 1lY3er-0002HT-NT for bug-gnu-emacs@gnu.org; Sun, 18 Apr 2021 05:24:01 -0400 X-Loop: help-debbugs@gnu.org Resent-From: Eli Zaretskii Original-Sender: "Debbugs-submit" Resent-CC: bug-gnu-emacs@gnu.org Resent-Date: Sun, 18 Apr 2021 09:24:01 +0000 Resent-Message-ID: Resent-Sender: help-debbugs@gnu.org X-GNU-PR-Message: followup 45198 X-GNU-PR-Package: emacs X-GNU-PR-Keywords: patch Original-Received: via spool by 45198-submit@debbugs.gnu.org id=B45198.16187378298745 (code B ref 45198); Sun, 18 Apr 2021 09:24:01 +0000 Original-Received: (at 45198) by debbugs.gnu.org; 18 Apr 2021 09:23:49 +0000 Original-Received: from localhost ([127.0.0.1]:45304 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from ) id 1lY3ef-0002Gy-Dd for submit@debbugs.gnu.org; Sun, 18 Apr 2021 05:23:49 -0400 Original-Received: from eggs.gnu.org ([209.51.188.92]:52340) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from ) id 1lY3ee-0002Gm-DG for 45198@debbugs.gnu.org; Sun, 18 Apr 2021 05:23:48 -0400 Original-Received: from fencepost.gnu.org ([2001:470:142:3::e]:48517) by eggs.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1lY3eY-00051t-2T; Sun, 18 Apr 2021 05:23:42 -0400 Original-Received: from 84.94.185.95.cable.012.net.il ([84.94.185.95]:2379 helo=home-c4e4a596f7) by fencepost.gnu.org with esmtpsa (TLS1.2:RSA_AES_256_CBC_SHA1:256) (Exim 4.82) (envelope-from ) id 1lY3eV-0001GV-Ec; Sun, 18 Apr 2021 05:23:40 -0400 In-Reply-To: (message from Philipp Stephani on Sun, 18 Apr 2021 11:11:28 +0200) X-BeenThere: debbugs-submit@debbugs.gnu.org X-Mailman-Version: 2.1.18 Precedence: list X-BeenThere: bug-gnu-emacs@gnu.org List-Id: "Bug reports for GNU Emacs, the Swiss army knife of text editors" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane-mx.org@gnu.org Original-Sender: "bug-gnu-emacs" Xref: news.gmane.io gmane.emacs.bugs:204315 Archived-At: > From: Philipp Stephani > Date: Sun, 18 Apr 2021 11:11:28 +0200 > Cc: Mattias Engdegård , > João Távora , > 45198@debbugs.gnu.org, Stefan Kangas , > Stefan Monnier , Alan Third > > > > > And what about users who make local changes > > > > in their Emacs? > > > > > > They can provide their own Seccomp policies or modify the ones included in Emacs. > > > > What does providing a policy entail? can you describe the procedure of > > tailoring a policy to changes in the Emacs code? > > 1. Run the Emacs sandbox with the code you want to run. > 2. Emacs will crash with SIGSYS if it hits a forbidden/unknown > syscall. Ensure that this generates a coredump. > 3. Check the backtrace for the coredump (e.g. coredumpctl debug) > and/or the Seccomp audit logs (ausearch) for the syscall that > triggered the signal. > 4. Add a rule for the syscall and its arguments to the BPF generation > program, e.g. lib-src/seccom-filter.c. > 5. Regenerate the BPF rule file. Sounds complicated, and requires non-trivial low-level knowledge and tools.