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Date:   Wed, 29 Aug 2018 12:06:54 -0400
From:   Rik van Riel <>
To:     Andy Lutomirski <>,,
        Nadav Amit <>
Cc:     Borislav Petkov <>, Jann Horn <>,
        LKML <>,,
        Peter Zijlstra <>
Subject: Re: [PATCH v2] x86/nmi: Fix some races in NMI uaccess

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:
> Cc: Peter Zijlstra <>
> Cc: Nadav Amit <>
> Signed-off-by: Andy Lutomirski <>

Reviewed-by: Rik van Riel <>

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