linux-kernel - [PATCH 3/3] security/keys: make BIG

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Date:   Wed, 26 Oct 2016 15:02:09 +0100
From:   David Howells <dhowells@...hat.com>
To:     jmorris@...ei.org
Cc:     Stephan Mueller <smueller@...onox.de>,
        Artem Savkov <asavkov@...hat.com>,
        linux-kernel@...r.kernel.org, stable@...r.kernel.org,
        dhowells@...hat.com, linux-security-module@...r.kernel.org,
        keyrings@...r.kernel.org,
        Kirill Marinushkin <k.marinushkin@...il.com>
Subject: [PATCH 3/3] security/keys: make BIG_KEYS dependent on stdrng.

From: Artem Savkov <asavkov@...hat.com>

Since BIG_KEYS can't be compiled as module it requires one of the "stdrng"
providers to be compiled into kernel. Otherwise big_key_crypto_init() fails
on crypto_alloc_rng step and next dereference of big_key_skcipher (e.g. in
big_key_preparse()) results in a NULL pointer dereference.

Fixes: 13100a72f40f5748a04017e0ab3df4cf27c809ef ('Security: Keys: Big keys stored encrypted')
Signed-off-by: Artem Savkov <asavkov@...hat.com>
Signed-off-by: David Howells <dhowells@...hat.com>
cc: Stephan Mueller <smueller@...onox.de>
cc: Kirill Marinushkin <k.marinushkin@...il.com>
cc: stable@...r.kernel.org
---

 security/keys/Kconfig |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/security/keys/Kconfig b/security/keys/Kconfig
index f826e8739023..d942c7c2bc0a 100644
--- a/security/keys/Kconfig
+++ b/security/keys/Kconfig
@@ -41,7 +41,7 @@ config BIG_KEYS
 	bool "Large payload keys"
 	depends on KEYS
 	depends on TMPFS
-	select CRYPTO
+	depends on (CRYPTO_ANSI_CPRNG = y || CRYPTO_DRBG = y)
 	select CRYPTO_AES
 	select CRYPTO_ECB
 	select CRYPTO_RNG