Bug 167670 - when invoked as root, kcron creates crontabs for all users, including NIS domain users who have never logged in, when saving any change
when invoked as root, kcron creates crontabs for all users, including NIS dom...
Product: Red Hat Enterprise Linux 4
Classification: Red Hat
Component: kdeadmin (Show other bugs)
All Linux
medium Severity low
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Assigned To: Ngo Than
Depends On:
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Reported: 2005-09-06 16:13 EDT by Chris Snook
Modified: 2008-08-22 08:19 EDT (History)
1 user (show)

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Doc Type: Bug Fix
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Last Closed: 2008-08-22 08:19:47 EDT
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Description Chris Snook 2005-09-06 16:13:32 EDT
From Bugzilla Helper:
User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.7.5) Gecko/20041215 Firefox/1.0 Red Hat/1.0-12.EL4

Description of problem:
When invoked as root, the kcron utility checks for crontabs for all users who could hypothetically ever log into the system, even non-local users who would not be permitted to actually run crontab.  This includes the entire NIS domain, if there is one.  This is by itself annoying.  If a change is made to any user, and saved, crontabs are created for all users, whether or not they are allowed to actually run crontab, have anything in their crontab, or have ever done anything at all on the system.

Version-Release number of selected component (if applicable):

How reproducible:

Steps to Reproduce:
1. Run kcron as root
2. change any crontab
3. save
4. note that you now have a number of crontabs under /var/spool/cron equal to (ypcat passwd | wc -l) + (wc -l /etc/passwd), plus possibly other databases or directories as well, if applicable

Actual Results:  It modified the one crontab I was changing, and created ((ypcat passwd | wc -l) + (wc -l /etc/passwd) - 1) new, empty crontabs.

Expected Results:  kcron should have only shown local users, and should only have saved crontabs that were modified, without creating anything for users with no crontab.  Perhaps a configuration option could override this, but the default behavior is not sane.

Additional info:

kcron as a non-root user shows only that user's crontab.
Comment 1 Phil Knirsch 2008-08-22 08:19:47 EDT
This request was evaluated by Red Hat Engineering for inclusion in a Red
Hat Enterprise Linux maintenance release.

Red Hat does not currently plan to provide this change in a Red Hat Enterprise
Linux update release for currently deployed products.

With the goal of minimizing risk of change for deployed systems, and in
response to customer and partner requirements, Red Hat takes a conservative
approach when evaluating enhancements for inclusion in maintenance updates
for currently deployed products. The primary objectives of update releases
are to enable new hardware platform support and to resolve critical

However, Red Hat will further review this request for potential inclusion
in future major releases of Red Hat Enterprise Linux.

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