linux-kernel - Re: [TOMOYO #5 18/18] LSM expansion for TOMOYO Linux.

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: <200711171810.00404.paul.moore@hp.com>
Date:	Sat, 17 Nov 2007 18:09:59 -0500
From:	Paul Moore <paul.moore@...com>
To:	Tetsuo Handa <penguin-kernel@...ove.sakura.ne.jp>
Cc:	akpm@...ux-foundation.org, linux-kernel@...r.kernel.org,
	linux-security-module@...r.kernel.org, takedakn@...data.co.jp
Subject: Re: [TOMOYO #5 18/18] LSM expansion for TOMOYO Linux.

On Friday 16 November 2007 10:45:32 pm Tetsuo Handa wrote:
> Paul Moore wrote:
> > I might be missing something here, but why do you need to do a skb_peek()
> > again?  You already have the skb and the sock, just do the unlink.
>
> The skb might be already dequeued by other thread while I slept inside
> security_post_recv_datagram().

Okay, well if that is the case I think you are going to have another problem 
in that you could end up throwing away skbs that haven't been through your 
security_post_recv_datagram() hook because you _always_ throw away the result 
of the second skb_peek().  Once again, if I'm wrong please correct me.

> > Second, why not move the 'no_peek' code to just before 'no_packet'?
>
> Oh, I didn't notice I can insert here. Now I can also move the rest code
> like
>
> |		error = security_post_recv_datagram(sk, skb, flags);
> |		if (error)
> |                       goto force_dequeue;
> |
> |         } while (!wait_for_packet(sk, err, &timeo));

Where did the 'if (skb) return skb;' code go?  Don't you need to do you LSM 
call before you return the skb?

-- 
paul moore
linux security @ hp
-
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/