[PATCH] arm64: Implement branch predictor hardening for Falkor

Shanker Donthineni shankerd at codeaurora.org
Mon Jan 8 13:44:24 PST 2018

Hi Will/Catalin,

Please drop https://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git/commit/?h=kpti&id=79ad24ef6c260efa0614896b15e67f4829448e32 in which you've removed FALKOR MIDR change. I've posted
v2 patch series including typo fix & FALKOR MIDR patch which is already available in upstream v4.15-rc7
branch. Please merge v2 patch.

On 01/08/2018 01:10 PM, Shanker Donthineni wrote:
> Hi Will,
> On 01/08/2018 12:44 PM, Will Deacon wrote:
>> On Mon, Jan 08, 2018 at 05:09:33PM +0000, Will Deacon wrote:
>>> On Fri, Jan 05, 2018 at 02:28:59PM -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.
>>> Thanks, Shanker. I'll pick this up (fixing the typo pointed out by Drew).
>> Note that MIDR_FALKOR doesn't exist in mainline, so I had to drop those
>> changes too. See the kpti branch for details.
> The FALKOR MIDR patch is already available in the upstream kernel v4.15-rc7
>     https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/arch/arm64?h=v4.15-rc7&id=c622cc013cece073722592cff1ac6643a33b1622
> If you want I can resend the above patch in v2 series including typo fix.
>> If you'd like anything else done here, please send additional patches to me
>> and Catalin that we can apply on top of what we currently have. Note that
>> I'm in the air tomorrow, so won't be picking up email.
>> Cheers,
>> Will
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Shanker Donthineni
Qualcomm Datacenter Technologies, Inc. as an affiliate of Qualcomm Technologies, Inc.
Qualcomm Technologies, Inc. is a member of the Code Aurora Forum, a Linux Foundation Collaborative Project.

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