linux-kernel - Re: [PATCH v2 09/18] x86/asm: Move SYSENTER_stack to the beginning of struct tss

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Message-ID: <alpine.DEB.2.20.1711232028000.2364@nanos>
Date:   Thu, 23 Nov 2017 20:30:59 +0100 (CET)
From:   Thomas Gleixner <tglx@...utronix.de>
To:     Andy Lutomirski <luto@...nel.org>
cc:     X86 ML <x86@...nel.org>, Borislav Petkov <bpetkov@...e.de>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Brian Gerst <brgerst@...il.com>,
        Dave Hansen <dave.hansen@...el.com>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Josh Poimboeuf <jpoimboe@...hat.com>
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 <luto@...nel.org>

Reviewed-by: Thomas Gleixner <tglx@...utronix.de>