[Bug 1051262] Re: nfs-common < 1.2.6 idmapd.conf parsing errors

[JiriHorky]

Hi,

I could not resist to say that pointing at a quite common bug in a C 
program (non terminating string with a 0 character) together with a link 
to the fix should be enough in my opinion. As the exact result of the 
idmapd behavior with this bug depends on a way glibc/kernel allocates 
the memory, it may be hard to hit a problem reproducibly, but it does 
not mean it is not there. I mainly writes it because the way I have hit 
the problem may say too non-standard.

I came across this problem with the idmapd.conf file below with a Static 
mapping plugin (that is only available in a git of libnfsidmapd that I 
used via LD_LIBRARY_PATH). The problem observed was:

root at elvys:~# LD_LIBRARY_PATH=~/libnfsidmap/.libs/ rpc.idmapd -f -vvv
rpc.idmapd: libnfsidmap: Unable to determine the NFSv4 domain; Using 
'localdomain' as the NFSv4 domain which means UIDs will be mapped to the 
'Nobody-User' user defined in /etc/idmapd.conf

root at elvys:~# cat /etc/idmapd.conf
[General]

Verbosity = 0
Pipefs-Directory = /run/rpc_pipefs
# set your own domain here, if id differs from FQDN minus hostname
Domain = EINFRA

[Mapping]

Nobody-User = nobody
Nobody-Group = nogroup

[Translation]
Method = static, nsswitch

[Static]

uzivatel at EINFRA = lokalniuzivatel
uzivatel2 at EINFRA = jinylokalniuzivatel
storage at EINFRA = users

Regards,
Jiri Horky

On 09/18/2012 09:00 AM, Steve Langasek wrote:
> Jiri,
>
> Could you provide a reproducible test case demonstrating the problem?
>
> ** Changed in: nfs-utils (Ubuntu)
>         Status: New =>  Fix Released
>
> ** Also affects: nfs-utils (Ubuntu Precise)
>     Importance: Undecided
>         Status: New
>
> ** Changed in: nfs-utils (Ubuntu Precise)
>         Status: New =>  Triaged
>
> ** Changed in: nfs-utils (Ubuntu Precise)
>     Importance: Undecided =>  High
>

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https://bugs.launchpad.net/bugs/1051262

Title:
  nfs-common < 1.2.6 idmapd.conf parsing errors

Status in “nfs-utils” package in Ubuntu:
  Fix Released
Status in “nfs-utils” source package in Precise:
  Triaged

Bug description:
  Hi,

  in Ubuntu 12.04, the version 1:1.2.5-3ubuntu3 of nfs-common (nfs-
  utils) suffers from the bug already reported upstream:

  https://bugzilla.linux-nfs.org/show_bug.cgi?id=205

  This causes failures when parsing idmapd.conf.  The fix is pretty
  simple and is already explained in the linked ticket. The bug is fixed
  in upstream nfs-utils v1.2.6,

  Cheers
  Jiri Horky

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