Package: dpkg Version: 1.16.0.3 Severity: normal start-stop-daemon is expected (as per man page) to set the supplemental groups of a user when called with option "-c user:group". This happens if the user is given in cleartext, not when passed as number. Both are legal based on the man page.
Behaviour verified on latest Debian stable 6.0.2 (vanilla live image) and on current Debian testing/unstable (dpkg 1.16.0.3). user@debian:~$ dpkg -s dpkg | grep Version Version: 1.15.8.11 user@debian:~$ grep "user" /etc/passwd user:x:1000:1000:Debian Live user,,,:/home/user:/bin/bash user@debian:~$ grep "user" /etc/group cdrom:x:24:user floppy:x:25:user audio:x:29:user dip:x:30:user video:x:44:user plugdev:x:46:user users:x:100: user:x:1000: user@debian:~$ sudo -i root@debian:~# start-stop-daemon -S -c user:dip -x /usr/bin/id uid=1000(user) gid=30(dip) groups=1000(user),24(cdrom),25(floppy),29(audio),30(dip),44(video),46(plugdev) root@debian:~# start-stop-daemon -S -c user:30 -x /usr/bin/id uid=1000(user) gid=30(dip) groups=1000(user),24(cdrom),25(floppy),29(audio),30(dip),44(video),46(plugdev) root@debian:~# start-stop-daemon -S -c 1000:dip -x /usr/bin/id uid=1000(user) gid=30(dip) groups=1000(user),30(dip) root@debian:~# start-stop-daemon -S -c 1000:30 -x /usr/bin/id uid=1000(user) gid=30(dip) groups=1000(user),30(dip) root@debian:~# Tracking it down in the source, the culprit is the call to initgroups(). It's defined as "int initgroups(const char *user, gid_t group)", but apparently only works with cleartext usernames, but not with an uid passed as text. In the latter two cases (-c 1000:whatever), the user is passed as string containing a number, i.e. "1000". Unfortunately, initgroups() still returns 0 for success in this case... -- System Information: Debian Release: wheezy/sid APT prefers testing APT policy: (990, 'testing'), (500, 'testing-proposed-updates'), (500, 'stable-updates'), (500, 'proposed-updates'), (500, 'unstable'), (500, 'stable') Architecture: i386 (i686) Kernel: Linux 2.6.39.2 (SMP w/4 CPU cores; PREEMPT) Locale: LANG=de_DE.UTF-8, LC_CTYPE=de_DE.UTF-8 (charmap=UTF-8) Shell: /bin/sh linked to /bin/bash Versions of packages dpkg depends on: ii coreutils 8.5-1 ii libbz2-1.0 1.0.5-6 ii libc6 2.13-18 ii libselinux1 2.1.0-1 ii xz-utils 5.1.1alpha+20110809-2 ii zlib1g 1:1.2.3.4.dfsg-3 dpkg recommends no packages. Versions of packages dpkg suggests: ii apt 0.8.15.6 -- no debconf information -- To UNSUBSCRIBE, email to [email protected] with a subject of "unsubscribe". Trouble? Contact [email protected]
