From: Paul Eggert <eggert@cs.ucla.edu>
To: Ulrich Mueller <ulm@gentoo.org>, 32083@debbugs.gnu.org
Cc: Tobias Klausmann <klausman@gentoo.org>
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 [thread overview]
Message-ID: <75b469a6-1b85-61e5-9f37-de76c59754e3@cs.ucla.edu> (raw)
In-Reply-To: <23360.58595.802485.895922@a1i15.kph.uni-mainz.de>
[-- Attachment #1: Type: text/plain, Size: 421 bytes --]
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).
[-- Attachment #2: 0001-Fix-bootstrap-infloop-in-GNU-Linux-alpha.patch --]
[-- Type: text/x-patch, Size: 1035 bytes --]
From 13726cbac681e442649de1dfd73fcc7f889e87d9 Mon Sep 17 00:00:00 2001
From: Paul Eggert <eggert@cs.ucla.edu>
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
next prev parent reply other threads:[~2018-07-07 18:03 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-07-07 15:28 bug#32083: 26.1.50; temacs bootstrap execs itself forever on alpha-unknown-linux-gnu Ulrich Mueller
2018-07-07 16:05 ` Ulrich Mueller
2018-07-07 18:03 ` Paul Eggert [this message]
2018-07-07 22:30 ` Ulrich Mueller
2018-07-08 16:05 ` Paul Eggert
2018-07-08 18:51 ` Paul Eggert
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