From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.org!.POSTED!not-for-mail From: Paul Eggert Newsgroups: gmane.emacs.bugs Subject: bug#32083: 26.1.50; temacs bootstrap execs itself forever on alpha-unknown-linux-gnu Date: Sat, 7 Jul 2018 11:03:40 -0700 Organization: UCLA Computer Science Department Message-ID: <75b469a6-1b85-61e5-9f37-de76c59754e3@cs.ucla.edu> References: <23360.56342.941119.625335@a1i15.kph.uni-mainz.de> <23360.58595.802485.895922@a1i15.kph.uni-mainz.de> NNTP-Posting-Host: blaine.gmane.org Mime-Version: 1.0 Content-Type: multipart/mixed; boundary="------------6BA0D091AA030920DAF2FD3F" X-Trace: blaine.gmane.org 1530986530 2179 195.159.176.226 (7 Jul 2018 18:02:10 GMT) X-Complaints-To: usenet@blaine.gmane.org NNTP-Posting-Date: Sat, 7 Jul 2018 18:02:10 +0000 (UTC) User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.8.0 Cc: Tobias Klausmann To: Ulrich Mueller , 32083@debbugs.gnu.org Original-X-From: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane.org@gnu.org Sat Jul 07 20:02:05 2018 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 1fbrX3-0000Po-A3 for geb-bug-gnu-emacs@m.gmane.org; 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charset=utf-8; format=flowed Content-Transfer-Encoding: 7bit Thanks for the bug report. Please try the attached patch; if it works around the bug for you, I'll install it on the emacs-26 branch and it should appear in the next Emacs release. It would also be helpful to file a bug report with the Alpha Linux kernel folks, as there does seem to be a kernel bug here (or at least, an unexpected inconsistency with x86-64 with respect to how process personalities survive exec). --------------6BA0D091AA030920DAF2FD3F Content-Type: text/x-patch; name="0001-Fix-bootstrap-infloop-in-GNU-Linux-alpha.patch" Content-Transfer-Encoding: 7bit Content-Disposition: attachment; filename="0001-Fix-bootstrap-infloop-in-GNU-Linux-alpha.patch" >From 13726cbac681e442649de1dfd73fcc7f889e87d9 Mon Sep 17 00:00:00 2001 From: Paul Eggert Date: Sat, 7 Jul 2018 10:59:22 -0700 Subject: [PATCH] Fix bootstrap infloop in GNU/Linux alpha * src/emacs.c (main): Do not re-exec if EMACS_HEAP_EXEC is already set (Bug#32083). --- src/emacs.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) diff --git a/src/emacs.c b/src/emacs.c index 017c62308c..f5e47428ef 100644 --- a/src/emacs.c +++ b/src/emacs.c @@ -707,10 +707,12 @@ main (int argc, char **argv) bool disable_aslr = dumping; # endif - if (disable_aslr && disable_address_randomization ()) + if (disable_aslr && disable_address_randomization () + && !getenv ("EMACS_HEAP_EXEC")) { /* Set this so the personality will be reverted before execs - after this one. */ + after this one, and to work around an re-exec loop on buggy + kernels (Bug#32083). */ xputenv ("EMACS_HEAP_EXEC=true"); /* Address randomization was enabled, but is now disabled. -- 2.17.1 --------------6BA0D091AA030920DAF2FD3F--