Received-SPF: pass (google.com: domain of linux-kernel+bounces-183308-linux.lists.archive=gmail.com@vger.kernel.org designates 2604:1380:4601:e00::3 as permitted sender) client-ip=2604:1380:4601:e00::3;
From: Jarkko Sakkinen <jarkko@kernel.org>
To: linux-integrity@vger.kernel.org
Cc: keyrings@vger.kernel.org,
	James.Bottomley@HansenPartnership.com,
	Jarkko Sakkinen <jarkko@kernel.org>,
	Vitor Soares <ivitro@gmail.com>,
	Peter Huewe <peterhuewe@gmx.de>,
	Jason Gunthorpe <jgg@ziepe.ca>,
	Mimi Zohar <zohar@linux.ibm.com>,
	David Howells <dhowells@redhat.com>,
	Paul Moore <paul@paul-moore.com>,
	James Morris <jmorris@namei.org>,
	"Serge E. Hallyn" <serge@hallyn.com>,
	linux-kernel@vger.kernel.org,
	linux-security-module@vger.kernel.org
Subject: [PATCH 1/3] tpm: Disable TCG_TPM2_HMAC by default
Date: Mon, 20 May 2024 02:51:19 +0300
Message-ID: <20240519235122.3380-2-jarkko@kernel.org>
In-Reply-To: <20240519235122.3380-1-jarkko@kernel.org>
References: <20240519235122.3380-1-jarkko@kernel.org>
Precedence: bulk
MIME-Version: 1.0
Content-Transfer-Encoding: 8bit

Causes performance drop in initialization so needs to be opt-in.
Distributors are capable of opt-in enabling this. Could be also handled by
kernel-command line in the future.

Reported-by: Vitor Soares <ivitro@gmail.com>
Closes: https://lore.kernel.org/linux-integrity/bf67346ef623ff3c452c4f968b7d900911e250c3.camel@gmail.com/#t
Fixes: d2add27cf2b8 ("tpm: Add NULL primary creation")
Signed-off-by: Jarkko Sakkinen <jarkko@kernel.org>
---
 drivers/char/tpm/Kconfig | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/char/tpm/Kconfig b/drivers/char/tpm/Kconfig
index e63a6a17793c..db41301e63f2 100644
--- a/drivers/char/tpm/Kconfig
+++ b/drivers/char/tpm/Kconfig
@@ -29,7 +29,7 @@ if TCG_TPM
 
 config TCG_TPM2_HMAC
 	bool "Use HMAC and encrypted transactions on the TPM bus"
-	default y
+	default n
 	select CRYPTO_ECDH
 	select CRYPTO_LIB_AESCFB
 	select CRYPTO_LIB_SHA256
-- 
2.45.1