group.of.nepali.translators team mailing list archive

[Po-Hsu Lin <po-hsu.lin@xxxxxxxxxxxxx>]

** No longer affects: linux-aws (Ubuntu)

** No longer affects: linux-aws (Ubuntu Xenial)

** No longer affects: linux-aws (Ubuntu Bionic)

-- 
You received this bug notification because you are a member of नेपाली
भाषा समायोजकहरुको समूह, which is subscribed to Xenial.
Matching subscriptions: Ubuntu 16.04 Bugs
https://bugs.launchpad.net/bugs/1786729

Title:
  execveat03 in ubuntu_ltp_syscalls failed on X/B

Status in ubuntu-kernel-tests:
  In Progress
Status in linux package in Ubuntu:
  Fix Released
Status in linux source package in Xenial:
  Fix Committed
Status in linux source package in Bionic:
  Fix Committed

Bug description:
  == Justification ==
  The code in cap_inode_getsecurity(), introduced by commit 8db6c34f1dbc
  ("Introduce v3 namespaced file capabilities"), should use
  d_find_any_alias() instead of d_find_alias() do handle unhashed dentry
  correctly. This is needed, for example, if execveat() is called with an
  open but unlinked overlayfs file, because overlayfs unhashes dentry on
  unlink.
  This is a regression of real life application, first reported at
  https://www.spinics.net/lists/linux-unionfs/msg05363.html

  With the execveat03 test in the LTP test suite on an affected kernel, it will fail with:
  <<<test_start>>>
  tag=execveat03 stime=1534135632
  cmdline="execveat03"
  contacts=""
  analysis=exit
  <<<test_output>>>
  incrementing stop
  tst_test.c:1017: INFO: Timeout per run is 0h 05m 00s
  execveat03.c:70: FAIL: execveat() returned unexpected errno: EINVAL

  Summary:
  passed   0
  failed   1
  skipped  0
  warnings 0

  == Fix ==
  355139a8 (cap_inode_getsecurity: use d_find_any_alias() instead of
   d_find_alias())

  It can be cherry-picked for Bionic, but it needs to be backported to
  Xenial along with the logic when we backport 8db6c34f1dbc (bug
  1778286).

  The test kernel for Xenial / Bionic could be found here:
  http://people.canonical.com/~phlin/kernel/lp-1786729-execveat03/

  This patch has already been cherry-picked into Cosmic and Unstable.

  == Regression Potential ==
  Low, this patch just uses a correct function to handle unhashed dentry, and it's been applied in both upstream and our newer kernel.

  == Test Case ==
  Run the reproducer in the commit message, or,
  run the execveat03 test in ubuntu_ltp_syscalls test suite. And it will pass with the patched kernel.

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: linux-image-4.4.0-1064-aws 4.4.0-1064.74
  ProcVersionSignature: User Name 4.4.0-1064.74-aws 4.4.140
  Uname: Linux 4.4.0-1064-aws x86_64
  ApportVersion: 2.20.1-0ubuntu2.18
  Architecture: amd64
  Date: Mon Aug 13 04:51:09 2018
  Ec2AMI: ami-529fb82a
  Ec2AMIManifest: (unknown)
  Ec2AvailabilityZone: us-west-2b
  Ec2InstanceType: x1e.xlarge
  Ec2Kernel: unavailable
  Ec2Ramdisk: unavailable
  SourcePackage: linux-aws
  UpgradeStatus: No upgrade log present (probably fresh install)

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu-kernel-tests/+bug/1786729/+subscriptions