Re: [PATCH 5/6] objtool: Add UACCESS validation

[Peter Zijlstra]

On Wed, Feb 27, 2019 at 08:18:21AM -0800, Linus Torvalds wrote:

> So the whole "run with AC on" thing isn't a big deal, apart from the
> scheduling case.
> 
> And we know how to fix the scheduling case by just doing the
> save/restore thing..

Right, but I was hoping to avoid having to do that; and I think we can
do that if we push all of kasan_report into an exception, like that
'patch' I just posted.

If I'm not mistaken the regular kasan house-keeping crud just prods at
the shadow memory with simple code and should be perfectly safe.