From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.org!.POSTED!not-for-mail From: Eli Zaretskii Newsgroups: gmane.emacs.bugs Subject: bug#27585: segfault when evaluating a file containing only backticks Date: Wed, 05 Jul 2017 21:41:45 +0300 Message-ID: <83van6n2ty.fsf@gnu.org> References: <1499235670.28433.1@ssh.steve.org.uk> Reply-To: Eli Zaretskii NNTP-Posting-Host: blaine.gmane.org X-Trace: blaine.gmane.org 1499280196 27103 195.159.176.226 (5 Jul 2017 18:43:16 GMT) X-Complaints-To: usenet@blaine.gmane.org NNTP-Posting-Date: Wed, 5 Jul 2017 18:43:16 +0000 (UTC) Cc: 27585@debbugs.gnu.org To: Steve Kemp Original-X-From: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane.org@gnu.org Wed Jul 05 20:43:11 2017 Return-path: Envelope-to: geb-bug-gnu-emacs@m.gmane.org Original-Received: from lists.gnu.org ([208.118.235.17]) by blaine.gmane.org with esmtp (Exim 4.84_2) (envelope-from ) id 1dSpGU-0006bK-0V for geb-bug-gnu-emacs@m.gmane.org; Wed, 05 Jul 2017 20:43:06 +0200 Original-Received: from localhost ([::1]:47634 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1dSpGZ-0007yc-Dj for geb-bug-gnu-emacs@m.gmane.org; Wed, 05 Jul 2017 14:43:11 -0400 Original-Received: from eggs.gnu.org ([2001:4830:134:3::10]:35848) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1dSpGT-0007yU-Jq for bug-gnu-emacs@gnu.org; Wed, 05 Jul 2017 14:43:06 -0400 Original-Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1dSpGQ-0005ZW-JX for bug-gnu-emacs@gnu.org; Wed, 05 Jul 2017 14:43:05 -0400 Original-Received: from debbugs.gnu.org ([208.118.235.43]:51022) by eggs.gnu.org with esmtps (TLS1.0:RSA_AES_128_CBC_SHA1:16) (Exim 4.71) (envelope-from ) id 1dSpGQ-0005ZN-Fc for bug-gnu-emacs@gnu.org; Wed, 05 Jul 2017 14:43:02 -0400 Original-Received: from Debian-debbugs by debbugs.gnu.org with local (Exim 4.84_2) (envelope-from ) id 1dSpGQ-0007LZ-4X for bug-gnu-emacs@gnu.org; Wed, 05 Jul 2017 14:43:02 -0400 X-Loop: help-debbugs@gnu.org Resent-From: Eli Zaretskii Original-Sender: "Debbugs-submit" Resent-CC: bug-gnu-emacs@gnu.org Resent-Date: Wed, 05 Jul 2017 18:43:02 +0000 Resent-Message-ID: Resent-Sender: help-debbugs@gnu.org X-GNU-PR-Message: followup 27585 X-GNU-PR-Package: emacs X-GNU-PR-Keywords: Original-Received: via spool by 27585-submit@debbugs.gnu.org id=B27585.149928013128184 (code B ref 27585); Wed, 05 Jul 2017 18:43:02 +0000 Original-Received: (at 27585) by debbugs.gnu.org; 5 Jul 2017 18:42:11 +0000 Original-Received: from localhost ([127.0.0.1]:53699 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from ) id 1dSpFb-0007KW-3x for submit@debbugs.gnu.org; Wed, 05 Jul 2017 14:42:11 -0400 Original-Received: from eggs.gnu.org ([208.118.235.92]:44731) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from ) id 1dSpFZ-0007KK-KP for 27585@debbugs.gnu.org; Wed, 05 Jul 2017 14:42:09 -0400 Original-Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1dSpFR-00059t-Ev for 27585@debbugs.gnu.org; Wed, 05 Jul 2017 14:42:04 -0400 Original-Received: from fencepost.gnu.org ([2001:4830:134:3::e]:37826) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1dSpFR-00059g-Bn; Wed, 05 Jul 2017 14:42:01 -0400 Original-Received: from 84.94.185.246.cable.012.net.il ([84.94.185.246]:3114 helo=home-c4e4a596f7) by fencepost.gnu.org with esmtpsa (TLS1.2:RSA_AES_256_CBC_SHA1:256) (Exim 4.82) (envelope-from ) id 1dSpFQ-0001R9-Os; Wed, 05 Jul 2017 14:42:01 -0400 In-reply-to: <1499235670.28433.1@ssh.steve.org.uk> (message from Steve Kemp on Wed, 05 Jul 2017 06:21:10 +0000) X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] X-BeenThere: debbugs-submit@debbugs.gnu.org X-Mailman-Version: 2.1.18 Precedence: list X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] X-Received-From: 208.118.235.43 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.org@gnu.org Original-Sender: "bug-gnu-emacs" Xref: news.gmane.org gmane.emacs.bugs:134217 Archived-At: > From: Steve Kemp > Date: Wed, 05 Jul 2017 06:21:10 +0000 > > > I've recently started fuzzing GNU Emacs, using the current git sources. > During the course of that work I stumbled upon this easily reproduced bug: > > deagol ~ $ perl -e 'print "`" x ( 1024 * 1024 * 12);' > t.el > deagol ~ $ /usr/bin/emacs --batch --script ./t.el > .. > Segmentation fault (core dumped) Here it says: Re-entering top level after C stack overflow and doesn't crash. > > Most likely just a stack overflow. > > Agreed, but still I think a segfault is unexpected and could be > prevented. See above: the machinery to try and prevent it exists, but it doesn't always succeed. And it really can't be 100% reliable. So I'm unsure what did you expect, and why. Emacs generally gives you enough rope to hang yourself; it's up to you not to be tempted to do so... IOW: why would someone want to run such a silly "program"?