On Wed, Jul 11, 2018 at 4:29 AM, Joerg Roedel <j...@8bytes.org> wrote:
> From: Joerg Roedel <jroe...@suse.de>
> Mapping the kernel text area to user-space makes only sense
> if it has the same permissions as in the kernel page-table.
> If permissions are different this will cause a TLB reload
> when using the kernel page-table, which is as good as not
> mapping it at all.
> On 64-bit kernels this patch makes no difference, as the
> whole range cloned by pti_clone_kernel_text() is mapped RO
> anyway. On 32 bit there are writeable mappings in the range,
> so just keep the permissions as they are.
Reviewed-by: Andy Lutomirski <l...@kernel.org>