Messages in this thread | | | Date | Fri, 05 Apr 2013 15:08:32 -0700 | From | "H. Peter Anvin" <> | Subject | Re: [PATCH 3/3] x86: kernel base offset ASLR |
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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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