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Date:   Thu, 23 Nov 2017 20:30:59 +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 09/18] x86/asm: Move SYSENTER_stack to the beginning
 of struct tss_struct

On Tue, 21 Nov 2017, Andy Lutomirski wrote:

> I want SYSENTER_stack to have reliable overflow detection, which
> means that it needs to be at the bottom of a page, not the top.
> Move it to the beginning of struct tss_struct and page-align it.
> Also add an assertion to make sure that the fixed hardware TSS
> doesn't cross a page boundary.
> Signed-off-by: Andy Lutomirski <>

Reviewed-by: Thomas Gleixner <>

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