** Changed in: linux (Ubuntu Xenial)
Status: In Progress => Fix Committed
** Changed in: linux (Ubuntu Bionic)
Status: In Progress => Fix Committed
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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-aws package in Ubuntu:
Fix Released
Status in linux source package in Xenial:
Fix Committed
Status in linux-aws source package in Xenial:
New
Status in linux source package in Bionic:
Fix Committed
Status in linux-aws source package in Bionic:
New
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)
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