linux-kernel - Re: [PATCH] binfmt_elf: fix PIE load with randomization disabled

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Message-ID: <52A63DCF.2060504@zytor.com>
Date:	Mon, 09 Dec 2013 14:01:51 -0800
From:	"H. Peter Anvin" <hpa@...or.com>
To:	"H.J. Lu" <hjl.tools@...il.com>
CC:	Jiri Kosina <jkosina@...e.cz>, LKML <linux-kernel@...r.kernel.org>,
	Josh Boyer <jwboyer@...hat.com>
Subject: Re: [PATCH] binfmt_elf: fix PIE load with randomization disabled

On 12/09/2013 01:59 PM, H.J. Lu wrote:
> 
> A Linux/x86-64 user came to me at the end of 2008.  He needed
> to load an executable above 4GB.  I added -Ttext-segment option
> to linker:
> 
> https://sourceware.org/ml/binutils/2009-01/msg00173.html
> 
> so that he could load his program compiled as PIE above 4GB.
> If kernel is changed not to honor it, his program won't work any more.
> In normal case, PIE has zero vaddr and this doesn't apply.
> 

That doesn't seem to be PIE at all, and if it is PIE, then it should be
relocatable (I agree btw with randomizing upward from the selected address.)

	-hpa

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