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Message-ID: <20071107224523.GA8223@infradead.org>
Date: Wed, 7 Nov 2007 22:45:23 +0000
From: Christoph Hellwig <hch@...radead.org>
To: Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>
Cc: hch@...radead.org, linux-security-module@...r.kernel.org,
linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
crispin@...spincowan.com
Subject: Re: Problem with accessing namespace_sem from LSM.
On Thu, Nov 08, 2007 at 07:04:23AM +0900, Tetsuo Handa wrote:
> The reason why I want to access namespace_sem inside security_inode_create() is that
> it doesn't receive "struct vfsmount" parameter.
> If "struct vfsmount" *were* passed to security_inode_create(),
> I have no need to access namespace_sem.
Same argument as with the AA folks: it does not have any business looking
at the vfsmount. If you create a file it can and in many setups will
show up in multiple vfsmounts, so making decisions based on the particular
one this creat happens through is wrong and actually dangerous.
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