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[Ricardo Salveti <rsalveti@xxxxxxxxxxxx>]

** Changed in: snappy/15.04
       Status: Fix Committed => Fix Released

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https://bugs.launchpad.net/bugs/1450642

Title:
  seccomp missing many new syscalls

Status in Snappy Ubuntu:
  Fix Released
Status in Snappy 15.04 series:
  Fix Released
Status in libseccomp package in Ubuntu:
  Fix Released
Status in libseccomp source package in Vivid:
  Fix Released
Status in libseccomp source package in Wily:
  Fix Released

Bug description:
  [Impact]
  Several syscalls were discovered to be missing when using the launcher on snappy. These should be added so we may properly support seccomp filtering.

  [Test Case]
  seccomp itself has a comprehensive testsuite, and while it doesn't fail the build, regressions can be seen by looking at the build log. Eg:

  Regression Test Summary
  tests run: 6494
  tests skipped: 52
  tests passed: 6494
  tests failed: 0
  tests errored: 0

  
  Furthermore, on a snappy system, perform:
  $ sudo snappy install hello-world
  $ hello-world.env

  It should show the environment. On an arm system with 2.1.1-1 from the archive, this will fail due to a seccomp denial:
  audit: type=1326 audit(1430766107.122:16): auid=1000 uid=1000 gid=1000 ses=15 pid=1491 comm="env" exe="/bin/bash" sig=31 arch=40000028 syscall=983045 compat=0 ip=0xb6fb0bd6 code=0x0

  (note, snappy images have a ppa fix for this, see notes below).

  
  To test the segfault fix, do:
  $ scmp_sys_resolver 1024
  Segmentation fault

  It should return:
  $ scmp_sys_resolver 1024
  UNKNOWN

  
  For the new 3.19 syscalls:
  $ scmp_sys_resolver getrandom
  -1

  it should return something like (actual number depends on arch, this is on armhf):
  $ scmp_sys_resolver getrandom
  384


  autopkgtests for libseccomp have been added as part of this update to verify that the library recognizes all the syscalls from 3.19 and the private syscalls. These tests can be run like so (assuming you are in the unpacked source and the binaries are in ../binary):
  $ export REL=vivid
  $ adt-run `for i in ../binary/*.deb ; do echo -n "-B $i " ; done` --source ../source/*.dsc --log-file /tmp/adt.out --- adt-virt-schroot autopkgtest-$REL-amd64 || echo "** AUTOPKGTESTS FAILED"

  Alternatively, if you don't have autopkgtest setup, you can do:
  $ apt-get install dpkg-dev build-essential linux-libc-dev libseccomp-dev seccomp
  $ export ADTTMP=/tmp/foo ; mkdir -p "$ADTTMP" ; sh ./debian/tests/test-filter
  ...
  PASS
  $ export ADTTMP=/tmp/foo ; mkdir -p "$ADTTMP" ; sh ./debian/tests/test-scmp_sys_resolver
  ...
  PASS

  
  Lastly, seccomp is used by lxc. lxc can be tested by using the test case as outlined in step 4 of https://wiki.ubuntu.com/Process/Merges/TestPlans/AppArmor#Desktop_only.

  
  [Regression Potential]
  If the above tests, regression potential is considered low. Unknown syscalls will continue to be handled as before.


  Description of changes:
  add finit_module:
  https://github.com/seccomp/libseccomp/commit/64152018ffdf971efefd84466db4a92002bb8b15

  sync the syscall table entries - 3.16
  https://github.com/seccomp/libseccomp/commit/9186136be7696ed63a8ddc06c9b397057abc5c75
  https://github.com/seccomp/libseccomp/commit/3f319a9a5bc2e32f5a3c296fb0476c040b6f46c4
  https://github.com/seccomp/libseccomp/commit/689f19e7488535c775c1db415b8d9895905ef8dd
  https://github.com/seccomp/libseccomp/commit/ac6802b300922ef2ad3e95e2c80f89b575073aeb
  https://github.com/seccomp/libseccomp/commit/c6205d9600983aa3fa68ca952b7624f2fec86718
  https://github.com/seccomp/libseccomp/commit/76739812a3e23182504cde43403ddb9921e0e05a

  sync the syscall table entries - 3.17
  https://github.com/seccomp/libseccomp/commit/6354f8cab5ac82a8d567005e58a9e7ff9dd843a9

  sync the syscall table entries - 3.19
  https://github.com/seccomp/libseccomp/commit/7b80fb2fb683cafaf5dc9ff7692437ba86e598a3

  This should also be applied (fix a segfault for invalid syscall numbers):
  https://github.com/seccomp/libseccomp/commit/2d09a74c7f04d29ae740db1e2187ff1a1886b2c3

  In addition, add-missing-arm-private-syscalls.patch is add to add 5
  private ARM syscalls. These are absolutely required on snappy. This
  portion of the patch has been well tested and is included by default
  in stable snappy images via the snappy image PPA.

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