From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.io!.POSTED.blaine.gmane.org!not-for-mail From: "Basil L. Contovounesios" Newsgroups: gmane.emacs.bugs Subject: bug#47708: 28.0.50; SIGSYS test failure with seccomp-filter.bpf Date: Sun, 11 Apr 2021 18:19:29 +0100 Message-ID: <875z0spwm6.fsf@tcd.ie> References: <87r1jharjy.fsf@tcd.ie> <87h7kcpww3.fsf@tcd.ie> Mime-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable Injection-Info: ciao.gmane.io; posting-host="blaine.gmane.org:116.202.254.214"; logging-data="34027"; mail-complaints-to="usenet@ciao.gmane.io" User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/28.0.50 (gnu/linux) Cc: 47708@debbugs.gnu.org To: Philipp Stephani Original-X-From: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane-mx.org@gnu.org Sun Apr 11 19:20:56 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 1lVdlY-0008in-0O for geb-bug-gnu-emacs@m.gmane-mx.org; Sun, 11 Apr 2021 19:20:56 +0200 Original-Received: from localhost ([::1]:32954 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1lVdlX-0008U7-1b for geb-bug-gnu-emacs@m.gmane-mx.org; Sun, 11 Apr 2021 13:20:55 -0400 Original-Received: from eggs.gnu.org ([2001:470:142:3::10]:40416) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1lVdkh-0008DU-Hz for bug-gnu-emacs@gnu.org; Sun, 11 Apr 2021 13:20:03 -0400 Original-Received: from debbugs.gnu.org ([209.51.188.43]:44273) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.90_1) (envelope-from ) id 1lVdkh-0006PP-Al for bug-gnu-emacs@gnu.org; Sun, 11 Apr 2021 13:20:03 -0400 Original-Received: from Debian-debbugs by debbugs.gnu.org with local (Exim 4.84_2) (envelope-from ) id 1lVdkh-0001yn-6e for bug-gnu-emacs@gnu.org; Sun, 11 Apr 2021 13:20:03 -0400 X-Loop: help-debbugs@gnu.org Resent-From: "Basil L. 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Contovounesios's message of "Sun, 11 Apr 2021 18:13:32 +0100") 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:203851 Archived-At: "Basil L. Contovounesios" writes: > Philipp Stephani writes: > >> Could you check which syscall exactly is failing, e.g. using >> journalctl -g SECCOMP -t audisp-syslog >> (assuming that system uses systemd and seccomp audit logging is enabled). > > After running: > > ./src/emacs -Q -batch -seccomp test/src/emacs-resources/seccomp-filter.= bpf > > the last audit in 'sudo journalctl -g SECCOMP' is: > > Apr 11 18:08:56 tia audit[25251]: SECCOMP auid=3D1000 uid=3D1000 gid=3D= 1000 > ses=3D3 subj=3D=3Dunconfined pid=3D25251 comm=3D"emacs" > exe=3D"/home/blc/.local/src/emacs/src/emacs" sig=3D31 arch=3Dc000003e > syscall=3D228 compat=3D0 ip=3D0x7fff7f1f7a7d code=3D0x80000000 > > Looking up syscall 228 online points to clock_gettime, just like in the > GDB log I attached in my previous message. I don't know whether this is relevant, but 'man 2 seccomp' has the following to say about clock_gettime: Caveats There are various subtleties to consider when applying seccomp filte= rs to a program, including the following: * Some traditional system calls have user-space implementations in t= he vdso(7) on many architectures. Notable examples include clock_ge= t=E2=80=90 time(2), gettimeofday(2), and time(2). On such architectures, se= c=E2=80=90 comp filtering for these system calls will have no effect. (Ho= w=E2=80=90 ever, there are cases where the vdso(7) implementations may fa= ll back to invoking the true system call, in which case seccomp filte= rs would see the system call.) --=20 Basil