[linux-yocto] v4.12.x - stable updates comprising v4.12.19

[Paul Gortmaker]

Bruce, Yocto kernel folks:

Here is the 5th 4.12.x stable update "extension" primarily created for
the Yocto project, continuing on top of the previous v4.12.18 kernel.

As indicated in the previous release, the 4.13 source that was being
used as a reference for commits we'd want here has been depleted.

So in this case, I've selected some commits in mainline that are found
to be used in the 4.14.x releases, plus some commits that are specific
to various CVE issues.

Note that there is only about 65 commits here.  These are all single
stand-alone commits that each solve one issue.  I thought it would be
good to "clear the plate" so to speak, and draw a line in the sand
before putting more complex fixes that span multiple commits into the
queue for the next 4.12.x release.

As usual, I've put this 4.12.x queue through the various testing that I
figured made sense, which includes but is not limited to:

-x86-64 sanity boot test + workloads of defconfig on COTS Core2 box.
-build MIPS, PPC, ARM, ARM64 with defconfig
-build x86-64 allmodconfig/allyesconfig
-build i386 allmodconfig/allyesconfig

I bumped the 4.12 Makefile and did the signed tag just as per the previously
released 4.12.x versions.

Please find a signed v4.12.19 tag using this key:

http://pgp.mit.edu/pks/lookup?op=vindex&search=0xEBCE84042C07D1D6

in the repo in my kernel.org directory here:

   https://git.kernel.org/cgit/linux/kernel/git/paulg/linux-4.12.y.git/
   git://git.kernel.org/pub/scm/linux/kernel/git/paulg/linux-4.12.y.git

for merge to standard/base in linux-yocto-4.12 and then out from there
into the other base and BSP branches.

For those who are interested, the evolution of the commits is here:

   https://git.kernel.org/cgit/linux/kernel/git/paulg/longterm-queue-4.12.git/

This repo isn't needed for anything; it just exists for transparency and
so people can see the raw commits that were used to create this 4.12.x
release, similar to Greg's stable queue:

   https://git.kernel.org/pub/scm/linux/kernel/git/stable/stable-queue.git/

Paul.
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