** Description changed:
[Impact]
- * update-rc.d, in sysv-rc-2.88dsf-41ubuntu6.3 is broken in trusty.
+ * update-rc.d, in sysv-rc-2.88dsf-41ubuntu6.3 is broken in trusty.
- * update-rc.d incorrectly modifies symlinks when enabling or disabling
services
- which are started on the "S" runlevel.
+ * update-rc.d incorrectly modifies symlinks when enabling or disabling
+ services which are started on the "S" runlevel.
- * This can lead to services being changed from S runlevel from where they
would
- be started on boot, to "0" runlevel, and are run on halt, which is
incorrect.
+ * This can lead to services being changed from S runlevel from where they
+ would be started on boot, to "0" runlevel, and are run on halt, which is
+ incorrect.
- * The bug is caused by trying to use the runlevel to index into an integer
- array of runlevels. When the runlevel in question is "S", an error is
printed
-
- Argument "S" isn't numeric in array element at /usr/sbin/update-rc.d line
232.
+ * The bug is caused by trying to use the runlevel to index into an integer
+ array of runlevels. When the runlevel in question is "S", an error is
+ printed
- Perl then sets the index to default to 0, which changes the runlevel.
+ Argument "S" isn't numeric in array element at /usr/sbin/update-rc.d line
+ 232.
- * The fix is to check if the runlevel is "S", and if it is, set the index to
99
- which conforms with other expected usages for the "S" runlevel in the
script.
- See the "startstop" and "makelinks" subroutines.
+ Perl then sets the index to default to 0, which changes the runlevel.
+
+ * The fix is to check if the runlevel is "S", and if it is, set the index to
+ 99 which conforms with other expected usages for the "S" runlevel in the
+ script. See the "startstop" and "makelinks" subroutines.
[Test Case]
- * You can reproduce this with any service that is started on the "S" runlevel.
- We will use open-iscsi for an example.
+ * You can reproduce this with any service that is started on the "S"
+ runlevel. We will use open-iscsi for an example.
1) Install open-iscsi
$ sudo apt install open-iscsi
2) Check to see symlinks for init.d scripts are set to defaults:
root@trusty-openiscsi:/etc# ls -l /etc/rc[0123456S].d/*iscsi*
- lrwxrwxrwx 1 root root 24 Apr 29 20:56 /etc/rc0.d/K80umountiscsi.sh ->
../init.d/umountiscsi.sh
- lrwxrwxrwx 1 root root 20 Apr 29 20:56 /etc/rc0.d/K81open-iscsi ->
../init.d/open-iscsi
- lrwxrwxrwx 1 root root 24 Apr 29 20:56 /etc/rc1.d/K80umountiscsi.sh ->
../init.d/umountiscsi.sh
- lrwxrwxrwx 1 root root 20 Apr 29 20:56 /etc/rc1.d/K81open-iscsi ->
../init.d/open-iscsi
- lrwxrwxrwx 1 root root 24 Apr 29 20:56 /etc/rc6.d/K80umountiscsi.sh ->
../init.d/umountiscsi.sh
- lrwxrwxrwx 1 root root 20 Apr 29 20:56 /etc/rc6.d/K81open-iscsi ->
../init.d/open-iscsi
- lrwxrwxrwx 1 root root 20 Apr 29 20:56 /etc/rcS.d/S45open-iscsi ->
../init.d/open-iscsi
+ /etc/rc0.d/K80umountiscsi.sh -> ../init.d/umountiscsi.sh
+ /etc/rc0.d/K81open-iscsi -> ../init.d/open-iscsi
+ /etc/rc1.d/K80umountiscsi.sh -> ../init.d/umountiscsi.sh
+ /etc/rc1.d/K81open-iscsi -> ../init.d/open-iscsi
+ /etc/rc6.d/K80umountiscsi.sh -> ../init.d/umountiscsi.sh
+ /etc/rc6.d/K81open-iscsi -> ../init.d/open-iscsi
+ /etc/rcS.d/S45open-iscsi -> ../init.d/open-iscsi
3) Use update-rc.d to enable open-iscsi service
root@trusty-openiscsi:/etc# update-rc.d open-iscsi enable
update-rc.d: warning: start runlevel arguments (none) do not match open-iscsi
Default-Start values (S)
update-rc.d: warning: stop runlevel arguments (none) do not match open-iscsi
Default-Stop values (0 1 6)
Argument "S" isn't numeric in array element at /usr/sbin/update-rc.d line 232.
Enabling system startup links for /etc/init.d/open-iscsi ...
Removing any system startup links for /etc/init.d/open-iscsi ...
/etc/rc0.d/K81open-iscsi
/etc/rc1.d/K81open-iscsi
/etc/rc6.d/K81open-iscsi
/etc/rcS.d/S45open-iscsi
Adding system startup for /etc/init.d/open-iscsi ...
/etc/rc0.d/K81open-iscsi -> ../init.d/open-iscsi
/etc/rc1.d/K81open-iscsi -> ../init.d/open-iscsi
/etc/rc6.d/K81open-iscsi -> ../init.d/open-iscsi
/etc/rc0.d/S45open-iscsi -> ../init.d/open-iscsi
- * The problem is the "/etc/rcS.d/S45open-iscsi" symlink is incorrectly
changed to
- "/etc/rc0.d/S45open-iscsi".
+ * The problem is the "/etc/rcS.d/S45open-iscsi" symlink is incorrectly
+ changed to "/etc/rc0.d/S45open-iscsi".
- * Instead, the correct behaviour is to keep the symlink in /etc/rcS.d/
- intact:
+ * Instead, the correct behaviour is to keep the symlink in /etc/rcS.d/
+ intact:
root@trusty-openiscsi:/etc# update-rc.d open-iscsi enable
update-rc.d: warning: start runlevel arguments (none) do not match open-iscsi
Default-Start values (S)
update-rc.d: warning: stop runlevel arguments (none) do not match open-iscsi
Default-Stop values (0 1 6)
Enabling system startup links for /etc/init.d/open-iscsi ...
Removing any system startup links for /etc/init.d/open-iscsi ...
/etc/rc0.d/K81open-iscsi
/etc/rc1.d/K81open-iscsi
/etc/rc6.d/K81open-iscsi
/etc/rcS.d/S45open-iscsi
Adding system startup for /etc/init.d/open-iscsi ...
/etc/rc0.d/K81open-iscsi -> ../init.d/open-iscsi
/etc/rc1.d/K81open-iscsi -> ../init.d/open-iscsi
/etc/rc6.d/K81open-iscsi -> ../init.d/open-iscsi
/etc/rcS.d/S45open-iscsi -> ../init.d/open-iscsi
-
[Regression Potential]
- * There is only one file modified, which is the update-rc.d perl script.
Worst
- case scenario is that users cannot enable or disable their services, or a
- symlink is changed such that a service is started / stopped on an incorrect
- runlevel.
+ * There is only one file modified, which is the update-rc.d perl script.
+ Worst case scenario is that users cannot enable or disable their services,
+ or a symlink is changed such that a service is started / stopped on an
+ incorrect runlevel.
- * If a regression happens, any damage should be easily spotted by a sysadmin,
- and can be manually repaired by making manual symlinks with "ln -s".
+ * If a regression happens, any damage should be easily spotted by a
+ sysadmin and can be manually repaired by making manual symlinks with
+ "ln -s".
[Other Info]
- * trusty is the last Ubuntu release to use sysvinit, and this bug is not
present
- in newer versions since they use systemd, and the code in question is
removed
- from update-rc.d.
+ * trusty is the last Ubuntu release to use sysvinit, and this bug is not
+ present in newer versions since they use systemd, and the code in question
+ is removed from update-rc.d.
- * The bug exists in debian squeeze, which is now unsupported, and the code
in
- question is not in any newer versions.
+ * The bug exists in debian squeeze, which is now unsupported, and the code
+ in question is not in any newer versions.
- * The bug was introduced in 2009-06-29 and somehow evaded anyone
- noticing it.
+ * The bug was introduced in 2009-06-29 and somehow evaded anyone noticing
+ it.
** Changed in: sysvinit (Ubuntu Trusty)
Status: New => In Progress
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https://bugs.launchpad.net/bugs/1827172
Title:
update-rc.d: enabling or disabling S runlevel services incorrectly
modifies runlevel
Status in sysvinit package in Ubuntu:
New
Status in sysvinit source package in Trusty:
In Progress
Bug description:
[Impact]
* update-rc.d, in sysv-rc-2.88dsf-41ubuntu6.3 is broken in trusty.
* update-rc.d incorrectly modifies symlinks when enabling or disabling
services which are started on the "S" runlevel.
* This can lead to services being changed from S runlevel from where they
would be started on boot, to "0" runlevel, and are run on halt, which is
incorrect.
* The bug is caused by trying to use the runlevel to index into an integer
array of runlevels. When the runlevel in question is "S", an error is
printed
Argument "S" isn't numeric in array element at /usr/sbin/update-rc.d line
232.
Perl then sets the index to default to 0, which changes the
runlevel.
* The fix is to check if the runlevel is "S", and if it is, set the index to
99 which conforms with other expected usages for the "S" runlevel in the
script. See the "startstop" and "makelinks" subroutines.
[Test Case]
* You can reproduce this with any service that is started on the "S"
runlevel. We will use open-iscsi for an example.
1) Install open-iscsi
$ sudo apt install open-iscsi
2) Check to see symlinks for init.d scripts are set to defaults:
root@trusty-openiscsi:/etc# ls -l /etc/rc[0123456S].d/*iscsi*
/etc/rc0.d/K80umountiscsi.sh -> ../init.d/umountiscsi.sh
/etc/rc0.d/K81open-iscsi -> ../init.d/open-iscsi
/etc/rc1.d/K80umountiscsi.sh -> ../init.d/umountiscsi.sh
/etc/rc1.d/K81open-iscsi -> ../init.d/open-iscsi
/etc/rc6.d/K80umountiscsi.sh -> ../init.d/umountiscsi.sh
/etc/rc6.d/K81open-iscsi -> ../init.d/open-iscsi
/etc/rcS.d/S45open-iscsi -> ../init.d/open-iscsi
3) Use update-rc.d to enable open-iscsi service
root@trusty-openiscsi:/etc# update-rc.d open-iscsi enable
update-rc.d: warning: start runlevel arguments (none) do not match open-iscsi
Default-Start values (S)
update-rc.d: warning: stop runlevel arguments (none) do not match open-iscsi
Default-Stop values (0 1 6)
Argument "S" isn't numeric in array element at /usr/sbin/update-rc.d line 232.
Enabling system startup links for /etc/init.d/open-iscsi ...
Removing any system startup links for /etc/init.d/open-iscsi ...
/etc/rc0.d/K81open-iscsi
/etc/rc1.d/K81open-iscsi
/etc/rc6.d/K81open-iscsi
/etc/rcS.d/S45open-iscsi
Adding system startup for /etc/init.d/open-iscsi ...
/etc/rc0.d/K81open-iscsi -> ../init.d/open-iscsi
/etc/rc1.d/K81open-iscsi -> ../init.d/open-iscsi
/etc/rc6.d/K81open-iscsi -> ../init.d/open-iscsi
/etc/rc0.d/S45open-iscsi -> ../init.d/open-iscsi
* The problem is the "/etc/rcS.d/S45open-iscsi" symlink is incorrectly
changed to "/etc/rc0.d/S45open-iscsi".
* Instead, the correct behaviour is to keep the symlink in /etc/rcS.d/
intact:
root@trusty-openiscsi:/etc# update-rc.d open-iscsi enable
update-rc.d: warning: start runlevel arguments (none) do not match open-iscsi
Default-Start values (S)
update-rc.d: warning: stop runlevel arguments (none) do not match open-iscsi
Default-Stop values (0 1 6)
Enabling system startup links for /etc/init.d/open-iscsi ...
Removing any system startup links for /etc/init.d/open-iscsi ...
/etc/rc0.d/K81open-iscsi
/etc/rc1.d/K81open-iscsi
/etc/rc6.d/K81open-iscsi
/etc/rcS.d/S45open-iscsi
Adding system startup for /etc/init.d/open-iscsi ...
/etc/rc0.d/K81open-iscsi -> ../init.d/open-iscsi
/etc/rc1.d/K81open-iscsi -> ../init.d/open-iscsi
/etc/rc6.d/K81open-iscsi -> ../init.d/open-iscsi
/etc/rcS.d/S45open-iscsi -> ../init.d/open-iscsi
[Regression Potential]
* There is only one file modified, which is the update-rc.d perl script.
Worst case scenario is that users cannot enable or disable their services,
or a symlink is changed such that a service is started / stopped on an
incorrect runlevel.
* If a regression happens, any damage should be easily spotted by a
sysadmin and can be manually repaired by making manual symlinks with
"ln -s".
[Other Info]
* trusty is the last Ubuntu release to use sysvinit, and this bug is not
present in newer versions since they use systemd, and the code in question
is removed from update-rc.d.
* The bug exists in debian squeeze, which is now unsupported, and the code
in question is not in any newer versions.
* The bug was introduced in 2009-06-29 and somehow evaded anyone noticing
it.
To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/sysvinit/+bug/1827172/+subscriptions
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