linux-kernel - Re: [BUG] A panic caused by null pointer dereference aftering updating to

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:	Mon, 14 Apr 2014 13:34:17 -0400 (EDT)
From:	David Miller <davem@...emloft.net>
To:	eric.dumazet@...il.com
Cc:	nasa4836@...il.com, jchapman@...alix.com, edumazet@...gle.com,
	joe@...ches.com, linux-kernel@...r.kernel.org,
	netdev@...r.kernel.org
Subject: Re: [BUG] A panic caused by null pointer dereference aftering
 updating to

From: Eric Dumazet <eric.dumazet@...il.com>
Date: Mon, 14 Apr 2014 10:12:29 -0700

> Hmm, it seems commit 31c70d5956fc l2tp: keep original skb ownership
> is the problem.
> 
> ip_queue_xmit() assumes the socket attached to skb is an inet socket.

This is similar to the "send over AF_PACKET" issue we were discussing
the other week.

It seems we need a real resolution to this issue.

To recap:

1) We want to charge memory to the top-level socket.

2) However during encapsulations etc. we can end up in IP stack
   which expects only IP sockets to be attached to skb->sk

I suspect that in the short term we may have to bit the bullet and
compromise #2, and do flow control via the tunnel's socket.
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/