[linux-yocto] v4.18.x - stable updates comprising v4.18.45

[Paul Gortmaker]

Bruce, Yocto kernel folks:

Here is the *final* 4.18.x stable update "extension" primarily created
for the Yocto project, continuing from the previous v4.18.44 release.

This final release closes out a run of 25 releases and about 4600
backports since GregKH stopped maintenance at v4.18.20, just under a
year ago.  I hope people have found the update extentsions useful during
that period; both Yocto users and "vanilla" 4.18.x users alike.

I didn't send an announce for 4.18.44, since I wanted to finish this
4.18.x run with the addition of the recent spectre-v1 (swapgs) variant
fixes.  But I wanted to also keep them separate to ease testing and
evaluation for integrators.  So the 44 is "normal" content, and the 45
is specific to spectre-v1/swapgs content, basically.

More specifically, the 4.18.44 release contains about 235 mainline
commits based on what was found in 4.19.51 --> 4.19.55 stable content.

The 4.18.45 release contains the swapgs (CVE-2019-1125) content, plus a
couple powerpc CVE fixes that caught my eye.  The x86 users can check:

 # cat /sys/devices/system/cpu/vulnerabilities/spectre_v1
 Mitigation: usercopy/swapgs barriers and __user pointer sanitization

Check Documentation/admin-guide/hw-vuln/spectre.rst for more info.

I've put this *final* 4.18.45 queue through the usual testing; build
testing on x86-64/32, ARM-64/32, PPC and MIPS, plus some static analysis
and finally some sanity runtime tests on x86-64.  The 4.18.44 release
also got the same independent testing prior to starting 4.18.45.

I did the signed tag just as per the previously released versions.
Please find a signed v4.18.45 tag using this key:

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

in the repo in the kernel.org directory here:

  https://git.kernel.org/pub/scm/linux/kernel/git/paulg/linux-4.18.y.git/?h=linux-4.18.y
  git://git.kernel.org/pub/scm/linux/kernel/git/paulg/linux-4.18.y.git

for merge to standard/base in linux-yocto-4.18 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-4.18.git/

This repo isn't needed for anything; it just exists for transparency and
so people can see the evolution of the raw commits that were originally
selected to create this 4.18.x release.

Paul.