On 07/09/2016 02:27 PM, Andy Lutomirski wrote: > is_prefetch in arch/x86/mm/fault.c can be called on a user address > that's not readable due to PKRU. This could break it. You might need > to add a get_user_exec or similar.
Thanks for the heads-up. I think I'll just need a version that does something along the lines of stac/clac, but with PKRU. I think I can do it with an "_exec" variant of probe_kernel_address(), but it's a bit messy.
