From: Florian Weimer <fweimer@redhat.com>
To: rms@gnu.org
Cc: Eli Zaretskii <eliz@gnu.org>,
libc-alpha@sourceware.org, monnier@iro.umontreal.ca,
emacs-devel@gnu.org
Subject: Re: Removal of unexec support from glibc malloc
Date: Tue, 26 Jan 2016 23:17:35 +0100 [thread overview]
Message-ID: <56A7F07F.9000109@redhat.com> (raw)
In-Reply-To: <E1aN72k-00024K-Ep@fencepost.gnu.org>
On 01/23/2016 11:52 PM, Richard Stallman wrote:
[realloc/free of a dumped heap object]
> It may be a pain to fix them if they happen inside libraries.
I think the dump-and-reload cycle resets global variables defined in
libraries as long as they are not referenced by the main program. This
means libraries have difficulties to retain references to objects
allocated before the dump.
If Emacs retains such references and passes them to a library, such
boundary-crossing heap operations could still happen. But some
libraries will get very confused if they are handed an object while
their internal state says they have not created any objects yet. (Which
is how we got __malloc_get_state and __malloc_set_state, I assume.)
Has it already happened that an innocent-looking library change causes
existing Emacs binaries to break? Apart from when glibc tried to fix
the incorrect object alignment on 32-bit PowerPC?
Florian
next prev parent reply other threads:[~2016-01-26 22:17 UTC|newest]
Thread overview: 77+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-01-18 12:33 Removal of unexec support from glibc malloc Florian Weimer
2016-01-18 19:20 ` John Wiegley
2016-01-18 20:27 ` Florian Weimer
2016-01-19 13:52 ` Should Glibc API be changed? Richard Stallman
2016-01-19 16:40 ` Florian Weimer
2016-01-20 2:56 ` Richard Stallman
2016-01-20 17:07 ` Florian Weimer
2016-01-23 5:56 ` Removal of unexec support from glibc malloc Stefan Monnier
2016-01-26 22:08 ` Florian Weimer
2016-01-18 22:45 ` Ali Bahrami
2016-01-18 23:45 ` John Wiegley
2016-01-19 0:45 ` Wolfgang Jenkner
2016-01-19 0:56 ` Ali Bahrami
2016-01-19 1:14 ` Dmitry Gutov
2016-01-19 1:44 ` Ken Raeburn
2016-01-19 1:59 ` Dmitry Gutov
2016-01-19 3:10 ` Ken Raeburn
2016-01-19 3:17 ` Dmitry Gutov
2016-01-19 7:03 ` Florian Weimer
2016-01-19 8:36 ` Ken Raeburn
2016-01-19 16:42 ` Eli Zaretskii
2016-01-19 1:45 ` Ali Bahrami
2016-01-19 2:03 ` Dmitry Gutov
2016-01-19 16:04 ` Eli Zaretskii
2016-01-20 2:57 ` Richard Stallman
2016-01-20 7:43 ` David Caldwell
2016-01-20 9:35 ` Eli Zaretskii
2016-01-21 3:01 ` Richard Stallman
2016-01-21 3:00 ` Richard Stallman
2016-01-19 15:58 ` Eli Zaretskii
2016-01-19 20:37 ` Fabrice Popineau
2016-01-20 2:56 ` Richard Stallman
2016-01-23 13:51 ` Michael Sperber
2016-01-23 20:36 ` Marcus Crestani
2016-01-19 23:53 ` Sam Steingold
2016-01-18 19:24 ` Paul Eggert
2016-01-18 19:30 ` John Wiegley
2016-01-18 19:47 ` Daniel Colascione
2016-01-18 19:54 ` Zack Weinberg
2016-01-18 19:55 ` Daniel Colascione
2016-01-18 22:27 ` Joseph Myers
2016-01-18 23:16 ` Florian Weimer
2016-01-18 19:50 ` Paul Eggert
2016-01-18 19:54 ` Daniel Colascione
2016-01-18 20:02 ` Eli Zaretskii
2016-01-18 20:05 ` Daniel Colascione
2016-01-18 22:10 ` Philipp Stephani
2016-01-18 22:12 ` Daniel Colascione
2016-01-18 22:36 ` Óscar Fuentes
2016-01-23 5:50 ` Stefan Monnier
2016-01-18 20:24 ` Wolfgang Jenkner
2016-01-18 20:29 ` Eli Zaretskii
2016-01-18 20:36 ` Wolfgang Jenkner
2016-01-18 22:42 ` Paul Eggert
2016-01-18 23:23 ` Florian Weimer
2016-01-19 6:31 ` Paul Eggert
2016-01-19 9:27 ` Florian Weimer
2016-01-19 10:14 ` Florian Weimer
2016-01-19 13:27 ` Wolfgang Jenkner
2016-01-19 16:58 ` Eli Zaretskii
2016-01-30 9:38 ` Paul Eggert
2016-01-18 22:44 ` Florian Weimer
2016-01-19 3:48 ` Eli Zaretskii
2016-01-23 5:49 ` Stefan Monnier
2016-01-23 7:00 ` Eli Zaretskii
2016-01-23 15:29 ` Stefan Monnier
2016-01-23 15:50 ` Eli Zaretskii
2016-01-23 22:19 ` Stefan Monnier
2016-01-23 22:52 ` Richard Stallman
2016-01-26 22:17 ` Florian Weimer [this message]
2016-01-27 1:32 ` Stefan Monnier
2016-01-27 3:38 ` Eli Zaretskii
2016-01-27 9:04 ` Florian Weimer
2016-01-27 16:02 ` Eli Zaretskii
2016-01-27 22:54 ` Richard Stallman
2016-01-27 22:52 ` Richard Stallman
2016-01-18 23:15 ` Florian Weimer
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