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Date:   Thu, 23 Nov 2017 20:36:22 +0100 (CET)
From:   Thomas Gleixner <>
To:     Andy Lutomirski <>
cc:     X86 ML <>, Borislav Petkov <>,
        "" <>,
        Brian Gerst <>,
        Dave Hansen <>,
        Linus Torvalds <>,
        Josh Poimboeuf <>
Subject: Re: [PATCH v2 12/18] x86/espfix/64: Stop assuming that pt_regs is
 on the entry stack

On Tue, 21 Nov 2017, Andy Lutomirski wrote:

> When we start using an entry trampoline, a #GP from userspace will
> be delivered on the entry stack, not on the task stack.  Fix the
> espfix64 #DF fixup to set up #GP according to TSS.SP0, rather than
> assuming that pt_regs + 1 == SP0.  This won't change anything
> without an entry stack, but it will make the code continue to work
> when an entry stack is added.
> Signed-off-by: Andy Lutomirski <>

Reviewed-by: Thomas Gleixner <>

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