Red Hat Bugzilla – Bug 478912
rsyslog doesn not enforce logging limits
Last modified: 2016-09-20 00:49:09 EDT
Apparently rsyslog does not enforce limits on the frequency of messages. It needs to do that however to make sure it cannot be forced into a DoS by filling up /var with nonsense. Even good ol' sysklogd limited the frequency of messages.
The simple line:
while true ; do echo fuck | logger ; done
will make /var be filled up sooner or later. With a lot of identical nonsensical messages. Triggered by something called as normal user. Good ol' sysklogf would only create two entries: the message itself and every minute or so "Last message repeated %u times.". That's the least rsyslog needs to do. (of course, it needs to limit non-identical messages, too)
Hmm, and unrelated to that looking at the code of rsyslog makes me feel really really unwell, ... threads, polish notation, uaaah! That's more appropriate on Windows than on free operating systems. Makes me wonder why Fedora picked rsyslog in the first place...
This bug appears to have been reported against 'rawhide' during the Fedora 11 development cycle.
Changing version to '11'.
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