[PATCH v4 23/26] arm64: head: remap the kernel text/inittext region read-only

[Kees Cook]

On Mon, Jun 13, 2022 at 04:45:47PM +0200, Ard Biesheuvel wrote:
> In order to be able to run with WXN from boot (which could potentially
> be under a hypervisor regime that mandates this), update the temporary
> kernel page tables with read-only attributes for the text regions before
> attempting to execute from them.
> 
> This is rather straight-forward for 16k and 64k granule configurations,
> as the split between executable and writable regions is guaranteed to be
> aligned to the granule used for the early kernel page tables. For 4k, it
> involves installing a single table entry and populating it accordingly.
> 
> Signed-off-by: Ard Biesheuvel <ardb at kernel.org>

Reviewed-by: Kees Cook <keescook at chromium.org>

-- 
Kees Cook