linux-kernel - Re: powerpc: Fix Text randomization

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Message-ID: <CAOpNGcu5UDP93FSoKSKJZJYBL_dK7i3KHn3OGzORR67odGjgzA@mail.gmail.com>
Date:	Fri, 14 Nov 2014 14:18:06 +0530
From:	Vineeth Vijayan <vvijayan@...sta.com>
To:	Michael Ellerman <mpe@...erman.id.au>
Cc:	benh@...nel.crashing.org, linuxppc-dev@...ts.ozlabs.org,
	linux-kernel@...r.kernel.org
Subject: Re: powerpc: Fix Text randomization

On Fri, Nov 14, 2014 at 11:50 AM, Michael Ellerman <mpe@...erman.id.au> wrote:
> On Fri, 2014-11-14 at 11:03 +0530, Vineeth Vijayan wrote:
>> ping !
>>
>> any update on this ? As i understand, only powerpc and s390 uses the
>> randomize_et_dyn call; for all other architecture this is an obsolete
>> function call.
>
> I asked:
>
>> >> I'm not clear on what has changed to break this?
>

Disabling PIE randomization was added in the commit
a3defbe5c337dbc6da911f8cc49ae3cc3b49b453
(binfmt_elf: fix PIE execution with randomization disabled). The
randomization is decided as
per the randomize_va_space sysctl flag.

As i understand, the randomization of the base address is implemented
at elf_map and not from the
arch/<>/include/asm/elf.h

Now, for powerpc, there's no support to disable the PIE randomization,
even after we disable the
same form randomize_va_space sysctl.This patch gives the support to
disable PIE randomization in
case it is disabled from this sysctl.

> And you didn't tell me.
>
>> this call for another patch where randomize_et_dyn is removed.
>
> Patches welcome :)
>

i will follow up with the patch.

> cheers
>
>
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