netdev - Re: [PATCH] netlink: Fix spectre v1 gadget in netlink

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Message-Id: <20180801.095135.79911181296177212.davem@davemloft.net>
Date:   Wed, 01 Aug 2018 09:51:35 -0700 (PDT)
From:   David Miller <davem@...emloft.net>
To:     jcline@...hat.com
Cc:     netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        jpoimboe@...hat.com
Subject: Re: [PATCH] netlink: Fix spectre v1 gadget in netlink_create()

From: Jeremy Cline <jcline@...hat.com>
Date: Tue, 31 Jul 2018 21:13:16 +0000

> 'protocol' is a user-controlled value, so sanitize it after the bounds
> check to avoid using it for speculative out-of-bounds access to arrays
> indexed by it.
> 
> This addresses the following accesses detected with the help of smatch:
> 
> * net/netlink/af_netlink.c:654 __netlink_create() warn: potential
>   spectre issue 'nlk_cb_mutex_keys' [w]
> 
> * net/netlink/af_netlink.c:654 __netlink_create() warn: potential
>   spectre issue 'nlk_cb_mutex_key_strings' [w]
> 
> * net/netlink/af_netlink.c:685 netlink_create() warn: potential spectre
>   issue 'nl_table' [w] (local cap)
> 
> Cc: Josh Poimboeuf <jpoimboe@...hat.com>
> Signed-off-by: Jeremy Cline <jcline@...hat.com>

Applied and queued up for -stable, thanks.