linux-kernel - Re: Avoid speculative indirect calls in kernel

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Message-ID: <20180108162240.zw2oe43unfihehcg@pd.tnic>
Date:   Mon, 8 Jan 2018 17:22:41 +0100
From:   Borislav Petkov <bp@...en8.de>
To:     Willy Tarreau <w@....eu>
Cc:     Dave Hansen <dave.hansen@...el.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Jon Masters <jcm@...hat.com>,
        "Woodhouse, David" <dwmw@...zon.co.uk>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Alan Cox <gnomes@...rguk.ukuu.org.uk>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Andi Kleen <andi@...stfloor.org>,
        Greg Kroah-Hartman <gregkh@...ux-foundation.org>,
        Tim Chen <tim.c.chen@...ux.intel.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Jeff Law <law@...hat.com>, Nick Clifton <nickc@...hat.com>
Subject: Re: Avoid speculative indirect calls in kernel

On Sun, Jan 07, 2018 at 11:10:38PM +0100, Willy Tarreau wrote:
>  I just want to be clear that the big drop some of us are facing is
> not an option *at all* for certain processes in certain environments
> and that we'll either continue to run with pti=off or with pti=on + a
> finer grained setting ASAP.

And that's all I'm saying: do pti=off in that case. The finer-grained
"solution" is just silly.

-- 
Regards/Gruss,
    Boris.

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