zero file called 0 created in $HOME each time Ubuntu DVD is inserted

Bug #1400357 reported by zebul666 on 2014-12-08
This bug affects 1 person
Affects Status Importance Assigned to Milestone
update-notifier (Ubuntu)
Brian Murray

Bug Description

I noticed that weird file called 0 (zero), and empty, in my home directory.
I deleted it and it came back !

then i used auditd to find out what process was creating such a file, so I used
auditctl -w /home/zebul666/0 -p wa -k home-zero-file

and to make it permanent I added the line "-w /home/zebul666/0 -p wa -k home-zero-file" in /etc/audit/rules.d/audit.rules

and wait.

and I had a hit with ausearch -k home-zeo-file showed me

time->Sat Nov 22 23:42:41 2014
type=PROCTITLE msg=audit(1416696161.454:19183): proctitle=2F62696E2F7368002D65002F70726F632F73656C662F66642F39
type=PATH msg=audit(1416696161.454:19183): item=1 name="0" inode=11535138 dev=fc:01 mode=0100664 ouid=1000 ogid=1000 rdev=00:00 nametype=CREATE
type=PATH msg=audit(1416696161.454:19183): item=0 name="/home/zebul666" inode=11534337 dev=fc:01 mode=040700 ouid=1000 ogid=1000 rdev=00:00 nametype=PARENT
type=CWD msg=audit(1416696161.454:19183): cwd="/home/zebul666"
type=SYSCALL msg=audit(1416696161.454:19183): arch=c000003e syscall=2 success=yes exit=3 a0=7f0c68b8ab08 a1=241 a2=1b6 a3=0 items=2 ppid=22150 pid=28635 auid=4294967295 uid=1000 gid=1000 euid=1000 suid=1000 fsuid=1000 egid=1000 sgid=1000 fsgid=1000 tty=(none) ses=4294967295 comm="sh" exe="/bin/dash" key="home-zero-file"

the process with pid 28635 was gone but more interestingly I noticed that the PPID 22150 is the one for upstart !

so it's a script launched by upstart
and I noticed in my /var/log/syslog at the approx. same time

Nov 22 23:42:30 callisto udisksd[3502]: Mounted /dev/sr0 at /media/zebul666/Ubuntu 14.10 amd64 on behalf of uid 1000

I don't know which script is run by upstart at dvd insertion but there is a bug in it that creates a empty zero file in home when you insert a ubuntu DVD

running ubuntu 14.10 amd64

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tags: added: bot-comment
Brian Murray (brian-murray) wrote :

It's probably caused by this file /usr/share/upstart/sessions/update-notifier-cds.conf.

affects: ubuntu → update-notifier (Ubuntu)
Brian Murray (brian-murray) wrote :

Or more explicitly some called by that.

zebul666 (zebul666) wrote :

line 20 of /usr/share/upstart/sessions/update-notifier-cds.conf is
    if [ $CDTYPE > 0 ]

I don't know much about dash but for bash I would have written
    if [ $CDTYPE -gt 0 ]

also in dash man page:
s1 > s2 True if string s1 comes after s2 based on the ASCII value of their characters.
n1 -gt n2 True if the integer n1 is algebraically greater than the integer n2.

as CDTYPE is an integer it's the second form.

I tried changing ">" to "-gt" in the file /usr/share/upstart/sessions/update-notifier-cds.conf and
it fixed it ! no zero file anymore !

zebul666 (zebul666) wrote :

I don't if it's a bug in dash but even with string, whatever I try the syntax if [ s1 > s2 ] always gives a s2 file written on filesystem.

zebul666 (zebul666) wrote :

it's not a bug in dash, it should be used with quote like

if [ s1 ">" s2 ] ....

so in our example:

if [ $CDTYPE ">" 0 ]
will work too

Steve Langasek (vorlon) wrote :

The right fix is to use the -gt operator, not >.

It may be a bug on the part of dash to interpret this as shell redirection in between '[' and ']', but I'm not sure of that, and in any case the right operator is -gt.

Brian, could you fix this?

Changed in update-notifier (Ubuntu):
assignee: nobody → Brian Murray (brian-murray)
status: New → Triaged
Changed in update-notifier (Ubuntu):
importance: Undecided → Medium
status: Triaged → Fix Committed
Launchpad Janitor (janitor) wrote :

This bug was fixed in the package update-notifier - 3.158

update-notifier (3.158) vivid; urgency=medium

  * debian/update-notifier-cds.conf: use the correct comparison operator for
    checking the type of CD. (LP: #1400357)
 -- Brian Murray <email address hidden> Wed, 10 Dec 2014 12:41:49 -0800

Changed in update-notifier (Ubuntu):
status: Fix Committed → Fix Released
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