Re: [Qemu-devel] [PATCH v7 1.0] configure: build position independent executables on x86 hosts

[Avi Kivity]

On 11/15/2011 04:57 PM, Anthony Liguori wrote:
> On 11/15/2011 05:25 AM, Peter Maydell wrote:
>> On 15 November 2011 09:34, Avi Kivity<address@hidden>  wrote:
>>> Change the default on x86 hosts to building PIE (position independent
>>> executables); instead of restricting the option to user-only targets,
>>> apply it to all targets.
>>>
>>> In addition, set the relocation sections to read-only (relro) when
>>> available;
>>> this reduces the attack surface by disallowing changes to relocation
>>> tables
>>> at runtime.
>>>
>>> While PIE reduces performance and relro increases load time, it greatly
>>> improves security, with the potential to reduce a code execution
>>> vulnerability
>>> to a self denial of service.
>>>
>>> Non-x86 are not changed, as they require TCG changes.
>>>
>>> Signed-off-by: Avi Kivity<address@hidden>
>>
>> Reviewed-by: Peter Maydell<address@hidden>
>>
>> ...as far as the technical content of the patch is concerned.
>> I'm still rather dubious about the merits of putting this patch
>> in this late in the release cycle.
>
> How about we limit this to be enabled by default on x86 Linux hosts?
>
> That would make me a lot more comfortable for 1.0 since I expect we
> can test that exhaustively.

It certainly suits me.  v8 coming up.

-- 
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