[CVE artful/linux trusty/linux] CVE-2018-6927 -- futex dos

[Andy Whitcroft]

CVE-2018-6927
	It was discovered that an integer overflow error existed
	in the futex implementation in the Linux kernel. A local
	attacker could use this to cause a denial of service
	(system crash).

Simple backports of the upstream fix follow this email.  Patches are
provided for artful and trusty.  Other series have already recieved this
via upstream or stable.

Proposing for SRU to artful/linux and trusty/linux.

-apw