linux-kernel - Re: [PATCH] RDMA/ucma: Fix Spectre v1 vulnerability

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Date:   Tue, 16 Oct 2018 12:49:43 -0400
From:   Doug Ledford <dledford@...hat.com>
To:     "Gustavo A. R. Silva" <gustavo@...eddedor.com>,
        Jason Gunthorpe <jgg@...pe.ca>
Cc:     linux-rdma@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] RDMA/ucma: Fix Spectre v1 vulnerability

On Tue, 2018-10-16 at 16:59 +0200, Gustavo A. R. Silva wrote:
> hdr.cmd can be indirectly controlled by user-space, hence leading to
> a potential exploitation of the Spectre variant 1 vulnerability.
> 
> This issue was detected with the help of Smatch:
> 
> drivers/infiniband/core/ucma.c:1686 ucma_write() warn: potential
> spectre issue 'ucma_cmd_table' [r] (local cap)
> 
> Fix this by sanitizing hdr.cmd before using it to index
> ucm_cmd_table.
> 
> 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://marc.info/?l=linux-kernel&m=152449131114778&w=2
> 
> 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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