| Date | Thu, 04 Apr 2013 13:21:29 -0700 | From | "H. Peter Anvin" <> | Subject | Re: [PATCH 3/3] x86: kernel base offset ASLR |
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I have to admit to being somewhat skeptical toward KASLR with only 8 bits of randomness. There are at least two potential ways of dramatically increasing the available randomness:
1. actually compose the kernel of multiple independently relocatable pieces (maybe chunk it on 2M boundaries or something.)
2. compile the kernel as one of the memory models which can be executed anywhere in the 64-bit address space. The cost of this would have to be quantified, of course.
The latter is particularly something that should be considered for the LPF JIT, to defend against JIT spray attacks.
-hpa
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