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Message #17795
[Bug 1332538] Re: No UID checks on rootfs updates
My syslog stopped growing, noted owner change:
phablet@ubuntu-phablet:~$ ls -l /var/log
total 129012
-rw-r--r-- 1 root root 0 Apr 30 06:25 alternatives.log
-rw-r--r-- 1 root root 346 Apr 29 14:55 alternatives.log.1
-rw-r--r-- 1 root root 1476 Feb 23 2014 alternatives.log.2.gz
-rw-r----- 1 root adm 0 Sep 15 10:17 apport.log
-rw-r----- 1 root adm 866 Sep 15 09:43 apport.log.1
-rw-r----- 1 root adm 449 Sep 12 10:04 apport.log.2.gz
-rw-r----- 1 root adm 548 Sep 11 19:02 apport.log.3.gz
-rw-r----- 1 root adm 308 Sep 10 09:12 apport.log.4.gz
-rw-r----- 1 root adm 83 Sep 9 16:32 apport.log.5.gz
-rw-r----- 1 root adm 473 Sep 8 17:41 apport.log.6.gz
-rw-r----- 1 root adm 515 Sep 8 09:47 apport.log.7.gz
drwxr-xr-x 2 root root 4096 Sep 1 00:19 apt
-rw-r----- 1 usermetrics adm 599137 Aug 20 09:04 auth.log
-rw-r----- 1 usermetrics adm 143042 Jul 27 06:49 auth.log.1
-rw-r----- 1 usermetrics adm 10891 Jul 21 06:27 auth.log.2.gz
-rw-r----- 1 usermetrics adm 7086 Jul 13 07:08 auth.log.3.gz
-rw-r----- 1 usermetrics adm 2968 Jul 6 06:26 auth.log.4.gz
-rw-r--r-- 1 root root 65466 Feb 23 2014 bootstrap.log
-rw-rw---- 1 root utmp 0 Sep 1 00:19 btmp
-rw-rw---- 1 root utmp 0 Aug 1 06:25 btmp.1
-rw-r----- 1 root adm 68038 Sep 15 14:52 dmesg
-rw-r----- 1 root adm 49406 Sep 15 14:50 dmesg.0
-rw-r----- 1 root adm 17487 Sep 15 09:45 dmesg.1.gz
-rw-r----- 1 root adm 16090 Sep 15 09:43 dmesg.2.gz
-rw-r----- 1 root adm 19710 Sep 12 12:41 dmesg.3.gz
-rw-r----- 1 root adm 15836 Sep 12 12:39 dmesg.4.gz
-rw-r--r-- 1 root root 13392 Sep 5 10:05 dpkg.log
-rw-r--r-- 1 root root 21400 Aug 29 08:56 dpkg.log.1
-rw-r--r-- 1 root root 4885 Jul 25 14:46 dpkg.log.2.gz
-rw-r--r-- 1 root root 1116 Jun 20 14:53 dpkg.log.3.gz
-rw-r--r-- 1 root root 642 Jun 2 17:50 dpkg.log.4.gz
-rw-r--r-- 1 root root 166 Apr 29 14:55 dpkg.log.5.gz
-rw-r--r-- 1 root root 382 Apr 15 16:29 dpkg.log.6.gz
-rw-r--r-- 1 root root 57849 Feb 23 2014 dpkg.log.7.gz
-rw-r--r-- 1 root root 768288 Feb 23 2014 faillog
-rw-r--r-- 1 root root 976 Feb 23 2014 fontconfig.log
drwxr-xr-x 2 root root 4096 Feb 24 2014 fsck
drwxr-xr-x 2 root root 4096 Feb 24 2014 installer
-rw-r----- 1 usermetrics adm 0 Jul 27 07:47 kern.log
-rw-r----- 1 usermetrics adm 61050880 Jul 23 16:01 kern.log.1
-rw-r----- 1 usermetrics adm 13139240 Jul 21 06:35 kern.log.2.gz
-rw-r----- 1 usermetrics adm 10502851 Jul 13 07:22 kern.log.3.gz
-rw-r----- 1 usermetrics adm 6091087 Jul 6 06:27 kern.log.4.gz
-rw-rw-r-- 1 root utmp 9347504 Sep 15 15:12 lastlog
drwxr-xr-x 2 root root 4096 Sep 15 14:53 lightdm
drwxr-xr-x 2 root root 4096 Apr 9 16:30 lxc
-rw-r--r-- 1 root root 53174 May 17 04:34 pm-powersave.log
-rw-r--r-- 1 root root 145082 Apr 30 17:16 pm-powersave.log.1
-rw-r--r-- 1 root root 1212 Apr 1 14:37 pm-powersave.log.2.gz
-rw-r--r-- 1 root root 569 Feb 28 2014 pm-powersave.log.3.gz
-rw-r----- 1 usermetrics adm 5834017 Aug 20 09:04 syslog
-rw-r----- 1 usermetrics adm 7914503 Aug 1 06:25 syslog.2
-rw-r----- 1 usermetrics adm 4069377 Jul 31 06:46 syslog.2.gz
-rw-r----- 1 usermetrics adm 4574517 Jul 30 06:56 syslog.3.gz
-rw-r----- 1 usermetrics adm 1963161 Jul 28 06:48 syslog.4.gz
-rw-r----- 1 usermetrics adm 2014220 Jul 27 06:57 syslog.5.gz
-rw-r----- 1 usermetrics adm 1852850 Jul 26 07:08 syslog.6.gz
-rw-r----- 1 usermetrics adm 796570 Jul 25 06:27 syslog.7.gz
drwxrws--- 2 root root 4096 Feb 24 2014 system-image
drwxr-xr-x 2 root root 32768 Sep 15 14:47 ubuntu-download-manager
drwxr-xr-x 2 root root 24576 Sep 15 15:08 ubuntu-location-service
-rw-r--r-- 1 root root 366680 Sep 15 14:49 udev
drwxr-xr-x 2 root root 4096 Feb 28 2014 unattended-upgrades
drwxr-xr-x 2 root root 20480 Sep 15 14:49 upstart
-rw-rw-r-- 1 root utmp 82176 Sep 15 15:12 wtmp
-rw-rw-r-- 1 root utmp 120576 Aug 29 22:39 wtmp.1
--
You received this bug notification because you are a member of Ubuntu
Touch seeded packages, which is subscribed to system-image in Ubuntu.
https://bugs.launchpad.net/bugs/1332538
Title:
No UID checks on rootfs updates
Status in “system-image” package in Ubuntu:
New
Bug description:
Hi,
system-image updates will currently happily deliver an updated
/etc/passwd with the list of UIDs reordered. This typically happens
when we seed new software that creates a new user upon install.
In a recent update, my /var/crash became owned by autopilot; most
likely the UID of whoopsie became the one of autopilot after the
update.
In the short-term, we could catch such UID insertions at rootfs
creation time, either before or after a rootfs hits the -proposed
channel.
In the mid-term, we need a strategy to cope with UID additions/removals/reorderings. One way to handle this would be to post-process UIDs by keeping a list of historical UIDs on the server side. For instance, on system-image.u.c systems we'd do this:
- for the first image, import /etc/passwd and keep a copy on system-image.u.c
- for updated images, compare /etc/passwd with the server copy; for each new UID, allocate a new system UIDs in the system-image.u.c master database
- remap UIDs from the rootfs tarball to the ones in the system-image.u.c master database
For instance, whoopsie would get a system UID allocated on system-
image.u.c the first time it's used in an image, say 120, then it keep
that 120 UID for all subsequent images. If a new image comes out of
livecd-rootfs with whoopsie as UID 121, we'd remap the UIDs to UID 120
and update /etc/passwd, /var/crash and any other file accordingly.
Perhaps there's a more clever way to deal with this; ideas welcome! I
fear that if we allow for UIDs to change in the distributed rootfs, we
will have trouble updating all the user owned files, including on
removable media, unmounted filesystems, in filesystem snapshots etc.
Cheers,
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