Re: [PATCH v3] mm: Add SLUB free list pointer obfuscation
From: Christoph Lameter
Date: Fri Jul 07 2017 - 13:07:07 EST
On Fri, 7 Jul 2017, Kees Cook wrote:
> If we also added a >0 offset, that would make things even less
> deterministic. Though I wonder if it would make the performance impact
> higher. The XOR patch right now is very light.
There would be barely any performance impact if you keep the offset within
a cacheline since most objects start on a cacheline boundary. The
processor has to fetch the cacheline anyways.