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

[H. Peter Anvin]

On 04/05/2013 03:06 PM, Julien Tinnes wrote:
> 
> Speaking of IDT, and to capture some off-thread discussion here, we
> should remember that the "SGDT" and "SIDT" instructions aren't
> privileged on x86, so user-land can leak these out without any way for
> the kernel to intercept that.
> 
> Adding their own random offsets to these two tables would be very
> useful. This could be done in a later patchset of course.
> 

Yes, if the GDT or IDT position is at all correlated to the kernel
position this is pointless.

	-hpa


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