Re: [PATCH] usercopy: Skip HIGHMEM page checking

[Kees Cook]

On Tue, Sep 17, 2019 at 09:36:06AM -0700, Matthew Wilcox wrote:
> If the copy has the correct bounds, the 'wholly within one base page'
> check will pass and it'll return.  If the copy does span a page,
> the virt_to_head_page(end) call will return something bogus, then the
> PageReserved and CMA test will cause the usercopy_abort() test to fail.
> 
> So I think your first patch is the right patch.

Okay, good points. I'll respin...

-- 
Kees Cook