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From: Jiri Kosina <jkosina@suse.cz>
To: Ingo Molnar <mingo@elte.hu>
Cc: Pavel Machek <pavel@ucw.cz>, kernel list <linux-kernel@vger.kernel.org>
Subject: Re: brk randomization breaks columns
Date: Mon, 4 Feb 2008 15:33:18 +0100 (CET)	[thread overview]
Message-ID: <Pine.LNX.4.64.0802041528470.30955@jikos.suse.cz> (raw)
In-Reply-To: <20080204130156.GA8730@elte.hu>

On Mon, 4 Feb 2008, Ingo Molnar wrote:

> hm, so it seems that it isnt even the randomization that causes the 
> problem - but somehow the randomization code itself is broken, right? 
> Would you be interested in figuring out how to unbreak this? [if not, 
> could you send me the binary?]

I still don't seem to fully understand what is happening here -- aparently 
this is triggerable only with old programs linked against libc.so.5, and I 
am not able to trigger it with my trivial program when I link it against 
old libc.so.5, which just basically does brk() and checks whether 
/proc/<pid>/maps are OK. Seems to me that (at least certain versions) of 
libc.so.5 (wrongly) assume that end of the bss is the start of the heap, 
but I will try to investigate it more.

Ingo, the code in commit c1d171a0029 is IMHO funcionalli identical to 
your exec-shield in fedora kernels, so even libc.so.5-linked binaries on 
any Fedora distro should trigger this bug ... (or you can use the binary 
that Pavel supplied). Haven't tried this yet.

Thanks,

-- 
Jiri Kosina

  parent reply	other threads:[~2008-02-04 14:34 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 [this message]
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
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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