linux-kernel - Re: [tpmdd-devel] [PATCH] TPM: Let the tpm char device be openable multiple times

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Message-ID: <6926.1257272068@turing-police.cc.vt.edu>
Date:	Tue, 03 Nov 2009 13:14:28 -0500
From:	Valdis.Kletnieks@...edu
To:	Hal Finney <hal.finney@...il.com>
Cc:	Jason Gunthorpe <jgunthorpe@...idianresearch.com>,
	tpmdd-devel@...ts.sourceforge.net, linux-kernel@...r.kernel.org,
	srajiv@...ux.vnet.ibm.com
Subject: Re: [tpmdd-devel] [PATCH] TPM: Let the tpm char device be openable multiple times

On Tue, 03 Nov 2009 09:31:55 PST, Hal Finney said:
> What if you don't want it accessible by user mode apps, you only want
> your middleware (ie tcs daemon, tcsd) to open it? Will this still
> allow that to be enforced, so nobody can interfere with tcsd's
> exclusive access to the device?

Couldn't tcsd just open the device with O_EXCL? Or am I missing something
subtle here?

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