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From: Pavel Machek <pavel@ucw.cz>
To: Arjan van de Ven <arjan@infradead.org>
Cc: Hugh Dickins <hugh@veritas.com>, Jiri Kosina <jkosina@suse.cz>,
	kernel list <linux-kernel@vger.kernel.org>,
	Ingo Molnar <mingo@elte.hu>,
	Abel Bernabeu <abel.bernabeu@gmail.com>
Subject: Re: brk randomization breaks columns
Date: Tue, 5 Feb 2008 18:33:58 +0100	[thread overview]
Message-ID: <20080205173358.GG24331@elf.ucw.cz> (raw)
In-Reply-To: <20080205085841.51713a5d@laptopd505.fenrus.org>

On Tue 2008-02-05 08:58:41, Arjan van de Ven wrote:
> On Tue, 5 Feb 2008 16:46:48 +0100
> Pavel Machek <pavel@ucw.cz> wrote:
> 
> > Hi!
> > 
> > > > In my usual dither, I'm rather hoping Arjan will have a clear
> > > > answer.
> > > 
> > > 
> > > setarch works. If the apps come in source form they need fixing
> > > anyway (since I'd not be surprised of current gcc reorders
> > > variables), if not.. we only have 2 cases, the other case was the
> > > build process of emacs (which got fixed 5 years ago).
> > 
> > uemacs ... broken with randomization
> > colums, sss ... local programs, broken with randomization
> > procinfo ... broken, randomization makes it die sooner.
> > mikmod ... broken with randomization
> > bsdsed ... broken with randomization
> > ...
> > Should I test few more?
> 
> ok throw that idea out of the window then
> 
> the combo of a config option + sysctl sounds the right way forward then ;(
> 
> Unless there's a way we can make sys_brk() detect this kind of behavior somehow...
> we could track per process if brk(0) was called, and if not, do something fancy to work around stuff?

That behaviour is indeed easy to detect. If someone does sys_brk()
with value lower than heap_start, it means it is old binary (but I'd
call that a hack).

But... older binaries call sys_personality(). Maybe it is cleaner not
to base check on that?
									Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html

  reply	other threads:[~2008-02-05 17:34 UTC|newest]

Thread overview: 39+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2008-02-04 12:28 Pavel Machek
2008-02-04 13:01 ` Ingo Molnar
2008-02-04 13:28   ` Pavel Machek
2008-02-04 14:55     ` Jiri Kosina
2008-02-04 20:25       ` Pavel Machek
2008-02-04 14:33   ` Jiri Kosina
2008-02-04 16:12     ` Jiri Kosina
     [not found]       ` <15577be70802041016m97cddbfk43b9073408bcbce9@mail.gmail.com>
     [not found]         ` <15577be70802041029o2975ba6do34589bbdc81d1652@mail.gmail.com>
2008-02-04 19:52           ` Fwd: " Pavel Machek
2008-02-04 21:54             ` Abel Bernabeu
2008-02-04 22:48               ` Jiri Kosina
2008-02-04 23:13                 ` Abel Bernabeu
2008-02-04 23:39                   ` Pavel Machek
2008-02-04 20:31       ` Pavel Machek
2008-02-05  1:57 ` Jiri Kosina
2008-02-05 11:06   ` [regression] " Pavel Machek
2008-02-05 12:50     ` Jiri Kosina
2008-02-05 12:54       ` Ingo Molnar
2008-02-05 13:05         ` Jakub Jelinek
2008-02-05 16:18           ` Pavel Machek
2008-02-05 16:37             ` Ingo Molnar
2008-02-05 16:12       ` Pavel Machek
2008-02-05 13:08   ` Hugh Dickins
2008-02-05 15:00     ` Arjan van de Ven
2008-02-05 15:46       ` Pavel Machek
2008-02-05 15:49         ` Jiri Kosina
2008-02-05 15:55           ` Pavel Machek
2008-02-05 15:49         ` Ingo Molnar
2008-02-05 15:59           ` Pavel Machek
2008-02-05 16:06             ` Ingo Molnar
2008-02-05 22:03               ` Pavel Machek
2008-02-05 16:58         ` Arjan van de Ven
2008-02-05 17:33           ` Pavel Machek [this message]
2008-02-05 22:35           ` Jiri Kosina
2008-02-06  3:24             ` Randy Dunlap
2008-02-05 16:02   ` Pavel Machek
2008-02-05 16:09     ` Ingo Molnar
2008-02-05 22:04       ` Pavel Machek
2008-02-05 18:05   ` Pavel Machek
2008-02-05 20:42     ` Jiri Kosina

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