Red Hat Bugzilla – Bug 231853
PPP causes a kernel crash
Last modified: 2007-11-30 17:11:59 EST
Description of problem:
We've found a replicable situation where pppd causes a kernel crash. First of
all a bit of framework.
We use pppd to provide remote support to some of our customers. Every customer
has a personal account to connect to our server using PPP. The firewall on
these accounts is configured so that we can connect back to their servers and
check for problems, but the remote server has basicly no access at all to our
Since few weeks one of these customers caught a virus or a dialer (it uses a
windows based server) which tries to connect to our server using the RAS entry
configured for remote support, probably thinking it is an Internet connection.
The RAS entry has the password saved, so that the virus is able to authenticate
against our server, even though it isn't able to do anything else because of
the configured firewall.
So far nothing wrong, by the way sometimes the virus is able to bring our
server down because of a kernel crash. I haven't been able to save the kernel
OOPS on screen but it clearly reported that the problem was caused by ppp. I
have a log of the debug PPP session as saved by pppd (see attachemnt). We will
further investigate to try to identify the virus or the dialer and may be catch
the kernel OOPS.
Version-Release number of selected component (if applicable): ppp 2.4.3-6.2.1,
kernel-smp 2.6.17 1.2157_FC5
How reproducible: difficult to reproduce
Steps to Reproduce: you need an infected windows pc, more info to be gathered
Actual results: kernel crash
Expected results: normal connection but no kernel crash and everything filtered
out by the firewall
Additional info: none
Sorry, duplicated by mistake. See bug 231850.
*** This bug has been marked as a duplicate of 231850 ***