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Date: Tue, 17 Jan 2012 20:40:02 +0000 From: David Howells <dhowells@...hat.com> To: jmorris@...ei.org Cc: keyrings@...ux-nfs.org, linux-security-module@...r.kernel.org, linux-kernel@...r.kernel.org, stable@...nel.org, Mimi Zohar <zohar@...ibm.com>, David Howells <dhowells@...hat.com> Subject: [PATCH 3/3] encrypted-keys: fix rcu and sparse messages From: Mimi Zohar <zohar@...ux.vnet.ibm.com> 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 <dmitry.kasatkin@...el.com> Signed-off-by: Mimi Zohar <zohar@...ibm.com> Signed-off-by: David Howells <dhowells@...hat.com> --- 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: -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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