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SubjectRe: [PATCH] mpls, nospec: Sanitize array index in mpls_label_ok()
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From: Dan Williams <dan.j.williams@intel.com>
Date: Wed, 07 Feb 2018 22:34:24 -0800

> mpls_label_ok() validates that the 'platform_label' array index from a
> userspace netlink message payload is valid. Under speculation the
> mpls_label_ok() result may not resolve in the CPU pipeline until after
> the index is used to access an array element. Sanitize the index to zero
> to prevent userspace-controlled arbitrary out-of-bounds speculation, a
> precursor for a speculative execution side channel vulnerability.
>
> Cc: <stable@vger.kernel.org>
> Cc: "David S. Miller" <davem@davemloft.net>
> Cc: Eric W. Biederman <ebiederm@xmission.com>
> Signed-off-by: Dan Williams <dan.j.williams@intel.com>

Applied, thank you.

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