linux-kernel - Re: [PATCH v2 2/2] arm64: Implement branch predictor hardening for Falkor

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Date:   Tue, 9 Jan 2018 10:04:27 +0000
From:   Will Deacon <will.deacon@....com>
To:     Shanker Donthineni <shankerd@...eaurora.org>
Cc:     Marc Zyngier <marc.zyngier@....com>,
        Christoffer Dall <christoffer.dall@...aro.org>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
        kvmarm <kvmarm@...ts.cs.columbia.edu>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Catalin Marinas <catalin.marinas@....com>,
        James Morse <james.morse@....com>,
        Vikram Sethi <vikrams@...eaurora.org>,
        Sean Campbell <scampbel@...eaurora.org>,
        Thomas Speier <tspeier@...eaurora.org>
Subject: Re: [PATCH v2 2/2] arm64: Implement branch predictor hardening for
 Falkor

On Mon, Jan 08, 2018 at 03:31:08PM -0600, Shanker Donthineni wrote:
> Falkor is susceptible to branch predictor aliasing and can
> theoretically be attacked by malicious code. This patch
> implements a mitigation for these attacks, preventing any
> malicious entries from affecting other victim contexts.
> 
> Signed-off-by: Shanker Donthineni <shankerd@...eaurora.org>
> ---
> Changes since v1:
>   Corrected typo to fix the compilation errors if HARDEN_BRANCH_PREDICTOR=n
> 
> This patch requires FALKOR MIDR which is available in upstream v4.15-rc7
>   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/arch/arm64?h=v4.15-rc7&id=c622cc013cece073722592cff1ac6643a33b1622 ans also
>   attached this v2 patch series.

Please resend this as a fixup on top of for-next/core. It might make the
most sense to queue that at -rc1, after the MIDR change has already landed
in mainline.

Will