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

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Message-ID: <CAMe9rOqEO271PUUkPAQu5hnZFyTX2viUXg8R0hpwDky0B-seyg@mail.gmail.com>
Date:	Mon, 9 Dec 2013 13:52:25 -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 1:49 PM, H. Peter Anvin <hpa@...or.com> wrote:
>>
>>> PT_LOAD being non-zero causing randomization to be turned off seems like
>>> quite unexpected behavior to me, with a great potential to cause a lot of
>>> confusion.
>>
>> There should be no difference between dynamic executable and PIE
>> with non-zero vaddr when choosing where to load them.
>>
>
> Why is that?  It would seem to be a big difference between a relocatable
> binary (PIE) and one with a load address fixed at link time.
>

PIE with non-zero vaddr should be loaded at non-zero
vaddr.  Otherwise, PIE may not work as expected.


-- 
H.J.
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