Re: kernel/1804: Networking Panic in 2.9

[Erik Fichtner <emf@servervault.com>]

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

On Tue, May 01, 2001 at 04:17:06PM +0200, Camiel Dobbelaar wrote:
> I got the same thing on a very low traffic firewall box just now.
> 
> I don't know assembly, but it may be worthwhile to doublecheck this
> change by Niklas:
> http://www.openbsd.org/cgi-bin/cvsweb/src/sys/arch/i386/i386/in_cksum.s.diff?r1=1.1&r2=1.1.16.1&f=h


Nah, that's not it, man.   we only get to that part of the code (which is the
right way to do it anyway) by the little test up in in_cksum1:

in_cksum1:      orl     %edi, %edi              # if (%edi == 0)
                je      in_cksum47              #   goto in_cksum47

                orl     %ebp, %ebp              # if (%ebp == NULL)
                je      in_cksum49              #   panic()


EBP contains our mbuf pointer, and it's gone away or been stepped on somewhere.
More ipf tomfoolery, I imagine, but in_cksum gets called all over the place...

- -- 
Erik Fichtner
Security Administrator, ServerVault, Inc.
703-333-5900
-----BEGIN PGP SIGNATURE-----
Version: GnuPG v1.0.5 (FreeBSD)
Comment: For info see http://www.gnupg.org

iD8DBQE67soxQ7EzrewLMS0RAtJXAKDdVt1LREqbDAIO+p0UMNYNw/WtzwCfcqFG
fkdRmRnU9RYcOdx19nLQotQ=
=zfyq
-----END PGP SIGNATURE-----