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Date:   Tue, 16 Apr 2019 23:05:54 -0500
From:   "Gustavo A. R. Silva" <>
To:     David Miller <>
Subject: Re: [PATCH] net: atm: Fix potential Spectre v1 vulnerabilities

On 4/16/19 11:02 PM, David Miller wrote:
> From: "Gustavo A. R. Silva" <>
> Date: Mon, 15 Apr 2019 15:57:23 -0500
>> arg is 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:
>> net/atm/lec.c:715 lec_mcast_attach() warn: potential spectre issue 'dev_lec' [r] (local cap)
>> Fix this by sanitizing arg before using it to index dev_lec.
>> 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]
>> Signed-off-by: Gustavo A. R. Silva <>
> Applied and queued up for -stable.

Thank you, Dave.


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