Security fixes for 4.9

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I've backported a number of fixes for security issues affecting 4.9-
stable.  All of these are already fixed in 4.14-stable and 4.19-stable.

Most of the issues involve filesystem validation, and I tested with the
reproducers where available.

For the BPF fix, I verified that the self-tests (taken from 4.14)
didn't regress and temporarily added logging to check that the
mitigation is applied when needed.

Ben.

-- 
Ben Hutchings, Software Developer                         Codethink Ltd
https://www.codethink.co.uk/                 Dale House, 35 Dale Street
                                     Manchester, M1 2HF, United Kingdom

Attachment: security-4.9.mbox
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