linux-kernel - Re: [PATCH] x86/speculation: Use Indirect Branch Prediction Barrier in context switch

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Message-ID: <20180130215731.pszc5u4gcc32ds4v@pd.tnic>
Date:   Tue, 30 Jan 2018 22:57:31 +0100
From:   Borislav Petkov <bp@...en8.de>
To:     Tim Chen <tim.c.chen@...ux.intel.com>
Cc:     David Woodhouse <dwmw@...zon.co.uk>, arjan@...ux.intel.com,
        tglx@...utronix.de, karahmed@...zon.de, x86@...nel.org,
        linux-kernel@...r.kernel.org, peterz@...radead.org,
        pbonzini@...hat.com, ak@...ux.intel.com,
        torvalds@...ux-foundation.org, gregkh@...ux-foundation.org,
        mingo@...nel.org, luto@...nel.org, linux@...inikbrodowski.net
Subject: Re: [PATCH] x86/speculation: Use Indirect Branch Prediction Barrier
 in context switch

On Tue, Jan 30, 2018 at 01:03:20PM -0800, Tim Chen wrote:
> So it doesn't seem to be very practical attack if the victim has set
> itself to be non-dumpable.

Probably, but considering how cheap our fix is, we might just as well
plug that hole too.

-- 
Regards/Gruss,
    Boris.

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