This bug is awaiting verification that the kernel in -proposed solves
the problem. Please test the kernel and update this bug with the
results. If the problem is solved, change the tag 'verification-needed-
bionic' to 'verification-done-bionic'. If the problem still exists,
change the tag 'verification-needed-bionic' to 'verification-failed-
bionic'.

If verification is not done by 5 working days from today, this fix will
be dropped from the source code, and this bug will be closed.

See https://wiki.ubuntu.com/Testing/EnableProposed for documentation how
to enable and use -proposed. Thank you!


** Tags added: verification-needed-bionic

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https://bugs.launchpad.net/bugs/1769696

Title:
  [SRU][Bionic/Artful] fix false positives in W+X checking

Status in linux package in Ubuntu:
  Confirmed
Status in linux source package in Xenial:
  Fix Committed
Status in linux source package in Artful:
  Fix Committed
Status in linux source package in Bionic:
  Fix Committed

Bug description:
  [Impact]
  on ARM64 servers we observe call trace "arm64/mm: Found insecure W+X mapping 
at address 0000000000a99000/0xa99000" while booting. These messages are a false 
positive and triggered at random.

  [Test]
  There is no reliable way to reproduce these warnings, they are triggered at 
random. But these messages can appear on any ARM64 server Cavium, Qualcomm etc. 
A test kernel is available in
  ppa:manjo/lp1769696 and the kernel was boot tested on a QDF2400 system and 
Cavium Thunderx.

  ubuntu@awrep2:~$ uname -a
  Linux awrep2 4.15.0-21-generic #22~lp1769696+build.1-Ubuntu SMP Mon May 7 
16:04:39 UTC 2018 aarch64 aarch64 aarch64 GNU/Linux

  ubuntu@boomer:~$ uname -a 
  Linux boomer 4.15.0-21-generic #22~lp1769696+build.1-Ubuntu SMP Mon May 7 
16:04:39 UTC 2018 aarch64 aarch64 aarch64 GNU/Linux
  ubuntu@boomer:~$ 

  
  [Fix]
  Upstream fix is available in linux-next

  65d313ee1a7d init: fix false positives in W+X checking

  [Regression Potential]
  potential for any regression is low.

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