netdev - RE: TCP_COOKIE_TRANSACTIONS synack data

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]

Message-ID: <2BC93087D531FF4A98881820AFE8AE7B74C409E1D6@jklmail01.ixonos.local>
Date:	Mon, 8 Mar 2010 18:33:28 +0200
From:	Penttilä Mika <mika.penttila@...nos.com>
To:	Eric Dumazet <eric.dumazet@...il.com>
CC:	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	William Allen Simpson <william.allen.simpson@...il.com>
Subject: RE: TCP_COOKIE_TRANSACTIONS synack data


> 
> Le lundi 08 mars 2010 à 16:27 +0200, Penttilä Mika a écrit :
> > The TCP_COOKIE_TRANSACTIONS synack data seems pretty unsafe atm.
> > >From tcp_make_synack():
> >
> >
> > 	u8 *buf = skb_put(skb, cvp->s_data_desired);
> >
> > 	/* copy data directly from the listening socket. */
> >     	memcpy(buf, cvp->s_data_payload, cvp->s_data_desired);
> >
> >
> > The skb here is allocated for MAX_TCP_HEADER + 15 and synack data
> could be as long as TCP_MSS_DEFAULT, panic():ing at the skb_put().
> >
> 
> Indeed, since start of december 2009.
> 
> Do you plan to provide a patch do you prefer someone else take care of
> it ?
> 

I'm not planning to provide a patch at least very soon so I think someone else can provide a quicker fix.


> Thanks
> 
>