Public bug reported:
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
** Affects: linux-lts-utopic (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1445664
Title:
kernel 3.16 breaks POSIX extended ACLs over NFS
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