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Date:   Fri, 24 Nov 2017 14:46:14 +0100 (CET)
From:   Thomas Gleixner <>
To:     Ingo Molnar <>
        Dave Hansen <>,
        Andy Lutomirski <>,
        "H . Peter Anvin" <>,
        Peter Zijlstra <>,
        Borislav Petkov <>,
        Linus Torvalds <>
Subject: Re: [PATCH 14/43] x86/entry/64: Return to userspace from the trampoline

On Fri, 24 Nov 2017, Ingo Molnar wrote:

> From: Andy Lutomirski <>
> By itself, this is useless.  It gives us the ability to run some final
> code before exit that cannnot run on the kernel stack.  This could
> include a CR3 switch a la KAISER or some kernel stack erasing, for
> example.  (Or even weird things like *changing* which kernel stack
> gets used as an ASLR-strengthening mechanism.)
> The SYSRET32 path is not covered yet.  It could be in the future or
> we could just ignore it and force the slow path if needed.
> Signed-off-by: Andy Lutomirski <>

Reviewed-by: Thomas Gleixner <>

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