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

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Message-ID: <CAMe9rOqAV5_+H97XSnrOHxcruouC=hCjDuEkiiyM8UM0BH5CWw@mail.gmail.com>
Date:	Mon, 9 Dec 2013 14:03:24 -0800
From:	"H.J. Lu" <hjl.tools@...il.com>
To:	"H. Peter Anvin" <hpa@...or.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 Mon, Dec 9, 2013 at 2:01 PM, H. Peter Anvin <hpa@...or.com> wrote:
> 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.)
>

Kernel can consider PIE with non-zero vaddr isn't real PIE.

-- 
H.J.
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