On Wed, 2018-08-29 at 08:47 -0700, Andy Lutomirski wrote: > In NMI context, we might be in the middle of context switching or in > the middle of switch_mm_irqs_off(). In either case, CR3 might not > match current->mm, which could cause copy_from_user_nmi() and > friends to read the wrong memory. > > Fix it by adding a new nmi_uaccess_okay() helper and checking it in > copy_from_user_nmi() and in __copy_from_user_nmi()'s callers. > > Cc: sta...@vger.kernel.org > Cc: Peter Zijlstra <pet...@infradead.org> > Cc: Nadav Amit <nadav.a...@gmail.com> > Signed-off-by: Andy Lutomirski <l...@kernel.org>
Reviewed-by: Rik van Riel <r...@surriel.com> -- All Rights Reversed.
signature.asc
Description: This is a digitally signed message part
