Re: [PATCH 3/3] x86: kernel base offset ASLR

[H. Peter Anvin]

Not if we do it right, but there is a huge potential boot time penalty.

Ingo Molnar <mingo@xxxxxxxxxx> wrote:

>
>* H. Peter Anvin <hpa@xxxxxxxxx> wrote:
>
>> On 04/05/2013 01:04 AM, Ingo Molnar wrote:
>> > 
>> > Random runtime shuffling of the kernel image - is that possible
>with 
>> > existing toolchains?
>> > 
>> 
>> Yes... the question is how much work we'd be willing to go through to
>make it 
>> happen.
>> 
>> One approach: the kernel already contains a linker -- used for
>modules -- and 
>> the bulk of the kernel could actually be composed to a "pile of
>modules" that 
>> gets linked on boot.  This would provide very large amounts of
>randomness.
>
>Is there no code generation / micro-performance disadvantage to that?
>
>Thanks,
>
>	Ingo

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