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From: David Miller <davem@davemloft.net>
To: gustavo@embeddedor.com
Cc: 3chas3@gmail.com, linux-atm-general@lists.sourceforge.net,
	netdev@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH] atm: zatm: Fix potential Spectre v1
Date: Sat, 30 Jun 2018 21:25:04 +0900 (KST)	[thread overview]
Message-ID: <20180630.212504.1792494967898031162.davem@davemloft.net> (raw)
In-Reply-To: <20180629182807.GA26287@embeddedor.com>

From: "Gustavo A. R. Silva" <gustavo@embeddedor.com>
Date: Fri, 29 Jun 2018 13:28:07 -0500

> pool 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/atm/zatm.c:1491 zatm_ioctl() warn: potential spectre issue
> 'zatm_dev->pool_info' (local cap)
> 
> Fix this by sanitizing pool before using it to index
> zatm_dev->pool_info
> 
> 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
> 
> Signed-off-by: Gustavo A. R. Silva <gustavo@embeddedor.com>

Applied.

  reply	other threads:[~2018-06-30 12:25 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-06-29 18:28 Gustavo A. R. Silva
2018-06-30 12:25 ` David Miller [this message]
  -- strict thread matches above, loose matches on Subject: below --
2018-05-03 18:17 Gustavo A. R. Silva
2018-05-03 19:09 ` Randy Dunlap
2018-05-03 19:25   ` David Miller
2018-05-04 16:54 ` David Miller

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