netdev - Re: [PATCH 4.4-stable 6/6] bpf: prevent out-of-bounds speculation

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Date:   Fri, 12 Jan 2018 08:52:23 -0800
From:   Eric Dumazet <eric.dumazet@...il.com>
To:     Jiri Slaby <jslaby@...e.cz>, gregkh@...uxfoundation.org
Cc:     stable@...r.kernel.org, ast@...nel.org, netdev@...r.kernel.org,
        Daniel Borkmann <daniel@...earbox.net>
Subject: Re: [PATCH 4.4-stable 6/6] bpf: prevent out-of-bounds speculation

On Fri, 2018-01-12 at 17:17 +0100, Jiri Slaby wrote:
> From: Alexei Starovoitov <ast@...nel.org>
> 
> commit b2157399cc9898260d6031c5bfe45fe137c1fbe7 upstream.
> 
> Under speculation, CPUs may mis-predict branches in bounds checks. Thus,
> memory accesses under a bounds check may be speculated even if the
> bounds check fails, providing a primitive for building a side channel.
> 

Make sure to also backport

https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf.git/commit/?id=
bbeb6e4323dad9b5e0ee9f60c223dd532e2403b1