Re: [GIT PULL] x86/mm changes for v4.21
From: Peter Zijlstra
Date: Thu Feb 07 2019 - 09:01:52 EST
On Thu, Feb 07, 2019 at 11:50:52AM +0000, Linus Torvalds wrote:
> If you re-generate the canonical address in __cpa_addr(), now we'll
> actually have the real virtual address around for a lot of code-paths
> (pte lookup etc), which was what people wanted to avoid in the first
> place.
Note that it's an 'unsigned long' address, not an actual pointer, and
(afaict) non of the code paths use it as a pointer. This _should_ avoid
the CPU from following said pointer and doing a deref on it.
But yes, I didn't go all the way down, maybe I missed some.