linux-kernel - Re: [PATCH] IB/hfi1: Fix Spectre v1 vulnerability

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Message-ID: <46095f6fd184092280401dc530f8a80478b5a1b0.camel@redhat.com>
Date:   Thu, 01 Aug 2019 12:14:58 -0400
From:   Doug Ledford <dledford@...hat.com>
To:     "Gustavo A. R. Silva" <gustavo@...eddedor.com>,
        Mike Marciniszyn <mike.marciniszyn@...el.com>,
        Dennis Dalessandro <dennis.dalessandro@...el.com>,
        Jason Gunthorpe <jgg@...pe.ca>, Ira Weiny <ira.weiny@...el.com>
Cc:     linux-rdma@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] IB/hfi1: Fix Spectre v1 vulnerability

On Wed, 2019-07-31 at 12:54 -0500, Gustavo A. R. Silva wrote:
> sl is controlled by user-space, hence leading to a potential
> exploitation of the Spectre variant 1 vulnerability.
> 
> Fix this by sanitizing sl before using it to index ibp->sl_to_sc.
> 
> Notice that given that speculation windows are large, the policy is
> to kill the speculation on the first load and not worry if it can be
> completed with a dependent load/store [1].
> 
> [1] 
> https://lore.kernel.org/lkml/20180423164740.GY17484@dhcp22.suse.cz/
> 
> Cc: stable@...r.kernel.org
> Signed-off-by: Gustavo A. R. Silva <gustavo@...eddedor.com>
> ---

Thanks, applied to for-rc.

-- 
Doug Ledford <dledford@...hat.com>
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