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From: "Ahmed S. Darwish" <darwish.07@gmail.com>
To: "Al Viro" <viro@ftp.linux.org.uk>
Cc: "Casey Schaufler" <casey@schaufler-ca.com>,
	torvalds@osdl.org, akpm@osdl.org,
	linux-security-module@vger.kernel.org,
	linux-kernel@vger.kernel.org
Subject: Re: [PATCH] Version 8 (2.6.23) Smack: Simplified Mandatory Access Control Kernel
Date: Fri, 19 Oct 2007 14:39:48 +0200
Message-ID: <1865922a0710190539j4eec697dmffeb7c97b9601c63@mail.gmail.com> (raw)
In-Reply-To: <20071018051031.GN8181@ftp.linux.org.uk>

On 10/18/07, Al Viro <viro@ftp.linux.org.uk> wrote:
> On Thu, Oct 18, 2007 at 05:57:05AM +0100, Al Viro wrote:
> > On Tue, Oct 16, 2007 at 09:17:40PM -0700, Casey Schaufler wrote:
>
> > Think what happens if CPU1 adds to list and CPU2 sees write to smk_known
> > *before* it sees write to ->smk_next.  We see a single-element list and
> > we'll be lucky if that single entry won't be FUBAR.
>
> While we are at it, what protects smack_cipso_count?
> -

My fault. I sent to Casey a one-liner patch to make "smack_cipso_count++"
be protected by the smk_cipsolock spinlock.

We don't need a lock in the reading side since we don't do a write operation
depending on that read, right ?.

-- 
Ahmed S. Darwish
Homepage: http://darwish.07.googlepages.com
Blog: http://darwish-07.blogspot.com

  reply index

Thread overview: 8+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2007-10-17  4:17 Casey Schaufler
2007-10-18  4:57 ` Al Viro
2007-10-18  5:10   ` Al Viro
2007-10-19 12:39     ` Ahmed S. Darwish [this message]
2007-10-18 20:13   ` Casey Schaufler
2007-10-18 20:26     ` Al Viro
2007-10-21  1:40 ` [PATCH] Smackv8: Omit non-cipso labels in cipso_seq_start Ahmed S. Darwish
2007-10-21  2:25   ` [PATCH] Smackv8: Safe lockless {cipso,load} read operation Ahmed S. Darwish

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