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

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Date:   Wed, 3 Jan 2018 16:15:01 -0800
From:   Andi Kleen <andi@...stfloor.org>
To:     Thomas Gleixner <tglx@...utronix.de>
Cc:     Andi Kleen <andi@...stfloor.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Greg Kroah-Hartman <gregkh@...ux-foundation.org>,
        dwmw@...zon.co.uk, Tim Chen <tim.c.chen@...ux.intel.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Dave Hansen <dave.hansen@...el.com>
Subject: Re: Avoid speculative indirect calls in kernel

> It should be a CPU_BUG bit as we have for the other mess. And that can be
> used for patching.

It has to be done at compile time because it requires a compiler option.

Most of the indirect calls are in C code.

So it cannot just patched in, only partially out.

-Andi