Bugtraq: Re: ping -R causes kernel panic on a forwarding machine ( 2.2.5 a nd 2 .2.10)

[atodosic () UBISOFT QC CA (Andrej Todosic)]

Correction:

this happens only when going through the NAt code.

I just tested and only time when it crashes is when one of the ends is in
NAT
( i haven tested with both endss in NAT but thats rare to find anyways )

so to resume:

kernel 2.2.10
ip utility
ipchains
one of the networks is NAT-ed

ping -R a NAT ed ip from a real ip ( it has to go through the fw )
or ping -R  a real ip from a NATed one
fw has to be below hop 9 on this road otherwise it doesnt work.

Result: complete kernel panic

my ip nat rules are rather simple .
so i belive anyone should be able to reproduce the problem.

comments ?
fixes ?

-----Original Message-----
From: Andrej Todosic [mailto:atodosic () ubisoft qc ca]
Sent: Thursday, July 22, 1999 10:04 AM
To: linux-kernel () vger rutgers edu
Subject: ping -R causes kernel panic on a forwarding machine ( 2.2.5 and
2 .2.10)

hello ,

i belive this is an old problem since this is not the first time i heard
about it.

ping ing with ping -R from through a firewall machine make the firewall go
into kernel panic
tried to kill idle task
not syncing

etc. etc.

does anyone know a fix for the problem ?

or a set of rules that will fix the problem ?

i believe ping -R works only on about nine hops... what bothers me
is that nine hops can be a lot of subnets :(

Thanks for any help

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