From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755863Ab2AQUkb (ORCPT ); Tue, 17 Jan 2012 15:40:31 -0500 Received: from mx1.redhat.com ([209.132.183.28]:39661 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755820Ab2AQUkT (ORCPT ); Tue, 17 Jan 2012 15:40:19 -0500 Organization: Red Hat UK Ltd. Registered Address: Red Hat UK Ltd, Amberley Place, 107-111 Peascod Street, Windsor, Berkshire, SI4 1TE, United Kingdom. Registered in England and Wales under Company Registration No. 3798903 From: David Howells Subject: [PATCH 3/3] encrypted-keys: fix rcu and sparse messages To: jmorris@namei.org Cc: keyrings@linux-nfs.org, linux-security-module@vger.kernel.org, linux-kernel@vger.kernel.org, stable@kernel.org, Mimi Zohar , David Howells Date: Tue, 17 Jan 2012 20:40:02 +0000 Message-ID: <20120117204002.14882.4097.stgit@warthog.procyon.org.uk> In-Reply-To: <20120117203940.14882.56709.stgit@warthog.procyon.org.uk> References: <20120117203940.14882.56709.stgit@warthog.procyon.org.uk> User-Agent: StGIT/0.14.3 MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Mimi Zohar Enabling CONFIG_PROVE_RCU and CONFIG_SPARSE_RCU_POINTER resulted in "suspicious rcu_dereference_check() usage!" and "incompatible types in comparison expression (different address spaces)" messages. Access the masterkey directly when holding the rwsem. Changelog v1: - Use either rcu_read_lock()/rcu_derefence_key()/rcu_read_unlock() or remove the unnecessary rcu_derefence() - David Howells Reported-by: Dmitry Kasatkin Signed-off-by: Mimi Zohar Signed-off-by: David Howells --- security/keys/encrypted-keys/encrypted.c | 2 +- security/keys/encrypted-keys/masterkey_trusted.c | 2 +- 2 files changed, 2 insertions(+), 2 deletions(-) diff --git a/security/keys/encrypted-keys/encrypted.c b/security/keys/encrypted-keys/encrypted.c index d91efb6..2d1bb8a 100644 --- a/security/keys/encrypted-keys/encrypted.c +++ b/security/keys/encrypted-keys/encrypted.c @@ -314,7 +314,7 @@ static struct key *request_user_key(const char *master_desc, u8 **master_key, goto error; down_read(&ukey->sem); - upayload = rcu_dereference(ukey->payload.data); + upayload = ukey->payload.data; *master_key = upayload->data; *master_keylen = upayload->datalen; error: diff --git a/security/keys/encrypted-keys/masterkey_trusted.c b/security/keys/encrypted-keys/masterkey_trusted.c index 8c16c3e..013f7e5 100644 --- a/security/keys/encrypted-keys/masterkey_trusted.c +++ b/security/keys/encrypted-keys/masterkey_trusted.c @@ -39,7 +39,7 @@ struct key *request_trusted_key(const char *trusted_desc, goto error; down_read(&tkey->sem); - tpayload = rcu_dereference(tkey->payload.data); + tpayload = tkey->payload.data; *master_key = tpayload->key; *master_keylen = tpayload->key_len; error: