linux-kernel - Re: [PATCH][RESEND] PIE randomization

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Date:	Thu, 05 Jul 2007 16:53:14 -0400
From:	Chuck Ebbert <cebbert@...hat.com>
To:	Jiri Kosina <jkosina@...e.cz>
CC:	Jakub Jelinek <jakub@...hat.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Jan Kratochvil <honza@...os.cz>, Ingo Molnar <mingo@...e.hu>,
	Rik van Riel <riel@...hat.com>, linux-kernel@...r.kernel.org,
	Ernie Petrides <petrides@...hat.com>
Subject: Re: [PATCH][RESEND] PIE randomization

On 07/04/2007 01:35 PM, Jiri Kosina wrote:
> On Wed, 4 Jul 2007, Jakub Jelinek wrote:
> 
>> The above highlighted changes are the cause of random segfaults of PIE 
>> binaries.  See 
>> https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=246623 
> 
> Thanks a lot for pointing this out. Andrew, could this be folded into 
> pie-randomization.patch please?
> 
> 
> From: Jiri Kosina <jkosina@...e.cz>
> 
> pie randomization: fix BAD_ADDR macro
> 
> pie-randomization.patch makes the load_addr in load_elf_interp() the load 
> bias of ld.so (difference between the actual load base address and first 
> PT_LOAD segment's p_vaddr). If the difference equals (on x86) to 
> 0xfffff000 (which is valid [1]), SIGSEGV is incorrectly sent.
> 
> This patch changes the BAD_ADDR so that it catches the mappings to the 
> error-area properly.

But what about this patch that made the opposite change:

http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commitdiff;h=ce51059be56f63762089412b3ece348067afda85

There was a reason for that change...

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