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https://bugs.launchpad.net/bugs/1755250

Title:
  backport statx syscall whitelist fix

Status in docker.io package in Ubuntu:
  Invalid
Status in libseccomp package in Ubuntu:
  Fix Released
Status in docker.io source package in Bionic:
  Invalid
Status in libseccomp source package in Bionic:
  Fix Committed
Status in docker.io source package in Cosmic:
  Invalid
Status in libseccomp source package in Cosmic:
  Fix Released

Bug description:
  [Impact]

   * Some newer workloads fail due to libseccomp as in Bionic lacking
  statx support

   * This backports the syscall definitions for statx to Bionic to allow
  to manage those

  [Test Case]

  # Note: I took a KVM image of Bionic to not spoil my system with Docker 
config for this test too much
  $ sudo apt install docker.io
  $ sudo usermod -a -G docker ubuntu
  $ cat > test-statx/Dockerfile << EOF
  FROM ubuntu:18.04
  RUN apt-get update && apt-get install -y wget gcc
  WORKDIR /tmp
  RUN wget -q 
https://raw.githubusercontent.com/torvalds/linux/master/samples/statx/test-statx.c
  RUN gcc test-statx.c -o test-statx
  RUN touch test-file
  RUN chmod +x ./test-statx
  RUN ./test-statx test-file
  EOF
  $ docker build test-statx

  With the bug and current docker 18.06.1-0ubuntu1~18.04.1 in Bionic
  that yields

  [...]
  Step 8/8 : RUN ./test-statx test-file
   ---> Running in 6e60a82409e6
  test-file: Operation not permitted
  statx(test-file) = -1
  The command '/bin/sh -c ./test-statx test-file' returned a non-zero code: 1

  With the fix applied it would work and look like:
  Step 8/8 : RUN ./test-statx test-file
   ---> Running in a83bc043e7bd
  statx(test-file) = 0
  results=fff
    Size: 0               Blocks: 0          IO Block: 4096    regular file
  Device: 00:32           Inode: 261994      Links: 1    
  Access: (0644/-rw-r--r--)  Uid:     0   Gid:     0
  Access: 2019-02-08 07:57:42.000000000+0000
  Modify: 2019-02-08 07:57:42.000000000+0000
  Change: 2019-02-08 07:57:43.076507007+0000
   Birth: 2019-02-08 07:57:43.076507007+0000
  Attributes: 0000000000000000 (........ ........ ........ ........ ........ 
........ ....-... .---.-..)
  Removing intermediate container a83bc043e7bd
   ---> d428d14cbc57
  Successfully built d428d14cbc57

  
  [Regression Potential] 

   * This "only" defines a new syscall number for all the architectures.
  It does not make any other changes, thereby it should be rather safe.
  If anything software could now manage statx through libseccomp and
  behavior that was formerly failing (like the reported docker case)
  would not succeed and due to that be a change in behavior - but I
  think it is a wanted change.

  [Other Info]
   
   * n/a

  ---

  
  Hello maintainer,

  The docker version 17.03 (bionic) in ubuntu doesn't allow the statx syscall 
which is needed to build qt >=5.10 applications:
  https://github.com/docker/for-linux/issues/208#issuecomment-372400859

  Could this fix be backported in the ubuntu package ?
  https://github.com/moby/moby/pull/36417

  regards,
  xan.

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