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Message #152862
[Bug 1445664] Re: kernel 3.16 breaks POSIX extended ACLs over NFS
Nelson Elhage, thank you for reporting this and helping make Ubuntu
better.
Please execute the following command only once, as it will automatically gather debugging information, in a terminal:
apport-collect 1445664
When reporting bugs in the future please use apport by using 'ubuntu-
bug' and the name of the package affected. You can learn more about this
functionality at https://wiki.ubuntu.com/ReportingBugs.
** Tags added: regression-release utopic
** No longer affects: linux-lts-vivid (Ubuntu)
** Package changed: linux-lts-utopic (Ubuntu) => linux (Ubuntu)
** Changed in: linux (Ubuntu)
Importance: Undecided => Medium
** Changed in: linux (Ubuntu)
Status: Confirmed => Incomplete
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https://bugs.launchpad.net/bugs/1445664
Title:
kernel 3.16 breaks POSIX extended ACLs over NFS
Status in linux package in Ubuntu:
Incomplete
Bug description:
I have a development environment that uses Vagrant with NFS shares to
a Trusty development VM from OS X laptops.
After the upgrade to the HWE kernel 3.16, installing Ruby gems into
the NFS mount inside the VM failed because of install(1) failing with
permission errors. Debugging revealed that it's trying to set POSIX
extended ACLs using setxattr(); On 3.13 this operation failed with
EOPNOTSUPP (the server does not support extended ACLs), but on 3.16 it
fails with EPERM, even if the NFS mount is explicitly mounted with
"noacl".
Debugging with ftrace and source diving suggests that kernel 3.16
refactored the POSIX extended ACL code so that before the call even
hits the NFS layer, it passes through a generic permission-check
layer. It appears that that layer is not aware of NFS UID remapping,
and so fails the call regardless of what the server would have done.
A simple test case is `install -c -m 0755 <some file> <some path in an
NFS mount>`, which will succeed on 3.13 and fail on 3.16.
The broken system is:
vagrant@packer-vmware-iso:~$ lsb_release -a; uname -a
No LSB modules are available.
Distributor ID: Ubuntu
Description: Ubuntu 14.04.2 LTS
Release: 14.04
Codename: trusty
Linux packer-vmware-iso 3.16.0-34-generic #47~14.04.1-Ubuntu SMP Fri Apr 10 17:49:16 UTC 2015 x86_64 x86_64 x86_64 GNU/Linux
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References