linux-kernel - Re: Out of tree module using LSM

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Message-ID: <20071129173601.34273083@the-village.bc.nu>
Date:	Thu, 29 Nov 2007 17:36:01 +0000
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	tvrtko.ursulin@...hos.com
Cc:	Al Viro <viro@....linux.org.uk>,
	Casey Schaufler <casey@...aufler-ca.com>,
	Christoph Hellwig <hch@...radead.org>,
	linux-kernel@...r.kernel.org, Valdis.Kletnieks@...edu
Subject: Re: Out of tree module using LSM

> closed. But more importantly further access to it can be blocked until 
> appropriate actions are taken which also applies with your example, no? Is 

That bit is hard- very hard.

> it possible to open for execute and have dirty mappings (or open for 
> write) on a file at the same time?

If I want I can have 16 threads executing code in a shared object being
written to by ten other programs at once and shared over a network while
we are at it. Its probably not a good idea but I can do it if I have
reason to.

Unix and Linux likewise take the basic view that locking is a problem for
the user, while file permissions prevent it being made a problem for
other users.
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