From: Ulrich Mueller <ulm@gentoo.org>
To: Paul Eggert <eggert@cs.ucla.edu>
Cc: 32083@debbugs.gnu.org, Tobias Klausmann <klausman@gentoo.org>
Subject: bug#32083: 26.1.50; temacs bootstrap execs itself forever on alpha-unknown-linux-gnu
Date: Sun, 8 Jul 2018 00:30:28 +0200 [thread overview]
Message-ID: <23361.16132.326783.361714@a1i15.kph.uni-mainz.de> (raw)
In-Reply-To: <75b469a6-1b85-61e5-9f37-de76c59754e3@cs.ucla.edu>
>>>>> On Sat, 7 Jul 2018, Paul Eggert wrote:
> 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.
Thank you. The patch fixes the problem here.
> 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).
Indeed it is different. In Linux, the SET_PERSONALITY macro in
arch/alpha/include/asm/elf.h simply does:
set_personality(PER_LINUX)
whereas elsewhere (e.g., ppc) the same macro has additional masking
(with PER_MASK being the lowest 8 bits, so ADDR_NO_RANDOMIZE would be
preserved):
set_personality(PER_LINUX | (current->personality & (~PER_MASK)))
We'll investigate and report a bug to Linux upstream.
next prev parent reply other threads:[~2018-07-07 22:30 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
2018-07-07 22:30 ` Ulrich Mueller [this message]
2018-07-08 16:05 ` Paul Eggert
2018-07-08 18:51 ` Paul Eggert
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