netdev - Re: [PATCH net-next v4 0/2] net: Introducing socket mark receive socket option

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, 02 Mar 2015 15:57:12 -0500 (EST)
From:	David Miller <davem@...emloft.net>
To:	eyal.birger@...il.com
Cc:	fw@...len.de, willemb@...gle.com, edumazet@...gle.com,
	shmulik.ladkani@...il.com, netdev@...r.kernel.org
Subject: Re: [PATCH net-next v4 0/2] net: Introducing socket mark receive
 socket option

From: Eyal Birger <eyal.birger@...il.com>
Date: Mon, 2 Mar 2015 22:38:50 +0200

> I can sum up the motivation for this feature as follows:
> 
> - skb->mark is set by user-space policy. It would make sense for
> user-space to be
>   able to query the resolution of that policy on a per packet basis -
> even if solely for the
>   purpose of debugging (e.g. fetching this meta-data on packet sockets
> on the xmit path
>   in order to debug tc behavior)

It is also set by routing, netfilter, classifier rules installed by the
administrator.

Therefore it is not universally true that it is safe to allow applications
to access this value.

I'm not applying this series, it's use case is at best dubious to me and
there are security/protection concerns as well.
--
To unsubscribe from this list: send the line "unsubscribe netdev" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html