linux-kernel - [PATCH] tpm: Disable TCG_TPM2

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Date: Sat, 18 May 2024 14:34:24 +0300
From: Jarkko Sakkinen <jarkko@...nel.org>
To: linux-integrity@...r.kernel.org
Cc: keyrings@...r.kernel.org,
	Jarkko Sakkinen <jarkko@...nel.org>,
	Vitor Soares <ivitro@...il.com>,
	Peter Huewe <peterhuewe@....de>,
	Jason Gunthorpe <jgg@...pe.ca>,
	James Bottomley <James.Bottomley@...senPartnership.com>,
	linux-kernel@...r.kernel.org (open list)
Subject: [PATCH] tpm: Disable TCG_TPM2_HMAC by default

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@...il.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@...nel.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
-- 
2.45.0