linux-kernel - [PATCH v1 2/2] evm: remove TCG

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Date:	Mon, 29 Aug 2011 10:48:33 -0400
From:	Mimi Zohar <zohar@...ux.vnet.ibm.com>
To:	linux-security-module@...r.kernel.org
Cc:	Mimi Zohar <zohar@...ux.vnet.ibm.com>,
	James Morris <jmorris@...ei.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Randy Dunlap <rdunlap@...otime.net>,
	Arnaud Lacombe <lacombar@...il.com>,
	Stephen Rothwell <sfr@...b.auug.org.au>,
	David Safford <safford@...son.ibm.com>,
	Mimi Zohar <zohar@...ibm.com>
Subject: [PATCH v1 2/2] evm: remove TCG_TPM dependency

All tristates selected by EVM(boolean) are forced to be builtin, except
in the TCG_TPM(tristate) dependency case. Arnaud Lacombe summarizes the
Kconfig bug as, "So it would seem direct dependency state influence the
state of reverse dependencies.."  For a detailed explanation, refer to
Arnaud Lacombe's posting http://lkml.org/lkml/2011/8/23/498.

With the "encrypted-keys: remove trusted-keys dependency" patch, EVM
can now be built without a dependency on TCG_TPM.  The trusted-keys
dependency requires trusted-keys to either be builtin or not selected.
This dependency will prevent the boolean/tristate mismatch from
occuring.

Reported-by: Stephen Rothwell <sfr@...b.auug.org.au>,
             Randy Dunlap <rdunlap@...otimenet>
Signed-off-by: Mimi Zohar <zohar@...ibm.com>
---
 security/integrity/evm/Kconfig |    3 +--
 1 files changed, 1 insertions(+), 2 deletions(-)

diff --git a/security/integrity/evm/Kconfig b/security/integrity/evm/Kconfig
index 884617d..afbb59d 100644
--- a/security/integrity/evm/Kconfig
+++ b/security/integrity/evm/Kconfig
@@ -1,11 +1,10 @@
 config EVM
 	boolean "EVM support"
-	depends on SECURITY && KEYS && TCG_TPM
+	depends on SECURITY && KEYS && (TRUSTED_KEYS=y || TRUSTED_KEYS=n)
 	select CRYPTO_HMAC
 	select CRYPTO_MD5
 	select CRYPTO_SHA1
 	select ENCRYPTED_KEYS
-	select TRUSTED_KEYS
 	default n
 	help
 	  EVM protects a file's security extended attributes against
-- 
1.7.3.4

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