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: [email protected] > Cc: Peter Zijlstra <[email protected]> > Cc: Nadav Amit <[email protected]> > Signed-off-by: Andy Lutomirski <[email protected]>
Reviewed-by: Rik van Riel <[email protected]> -- All Rights Reversed.
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