Installer try to exec scripts under /tmp

[EricDHH]

Ubuntu 12.04, i386 on thinkpad x41

Got the new resolvconf package by update today, but the update did not install cleanly.

Vorkonfiguration der Pakete ...
Can't exec "/tmp/resolvconf.config.31971": Keine Berechtigung at /usr/share/perl/5.14/IPC/Open3.pm line 186.
open2: exec of /tmp/resolvconf.config.31971 configure 1.63ubuntu15 failed at /usr/share/perl5/Debconf/ConfModule.pm line 59

The /tmp is mounted as nonexec like described in linux security guides, so the way to exec programs there is a bit ugly.

/etc/fstab
tmpfs /var/tmp tmpfs noexec,defaults,noatime 0 0

ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: resolvconf 1.63ubuntu16
ProcVersionSignature: Ubuntu 3.2.0-23.36-generic-pae 3.2.14
Uname: Linux 3.2.0-23-generic-pae i686
ApportVersion: 2.0.1-0ubuntu13
Architecture: i386
Date: Sun Sep 9 08:18:58 2012
EcryptfsInUse: Yes
PackageArchitecture: all
ProcEnviron:
 TERM=xterm
 PATH=(custom, no user)
 LANG=de_DE.UTF-8
 SHELL=/bin/bash
SourcePackage: resolvconf
UpgradeStatus: No upgrade log present (probably fresh install)

[Steve Langasek (vorlon)]

> The /tmp is mounted as nonexec like described in linux security
> guides,

This is not a supported configuration in Ubuntu. You might want to find a better security guide.

The exec is being done as part of pre-configuration of debconf. You can change this behavior by editing /etc/apt/apt.conf.d/70debconf, but it's not advisable.