From patchwork Tue May 28 09:54:33 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jarkko Sakkinen X-Patchwork-Id: 13676412 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 84E53157E61; Tue, 28 May 2024 09:54:43 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1716890083; cv=none; b=Ty/4t54QUciC8eksyMA5bd2SuPSopF3WiOMwj6kaEBUefy0KJkvr90+t1ALj03lN8dwHADceewLtz8B8ET3cvlqhM/RYkxkCAFkjb3MdbraN7j83gn2Y9vLwKTgECHwp1NYhBfPKkiPJiikmHz49yotVMzzAXQw3+3xB7uoLwT0= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1716890083; c=relaxed/simple; bh=UoqEy8pe0oo6Q6KLGXA6s4y3pv5XRjR1eEUiP0TzPYg=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version; b=gDkgQ+kdEKzPqbJeknaqtvme2W0+Tucp0tE24aKBq2jpLu4VNM7xBd7PZROyxRqO5aX8eKvdCzdbZBQ4SaOOpKYE2UxMUwtwgaZxRHM4eleZMU0vaHYwhe/bk2FOJN71X+oA1hN2er18zy3YUjFs1G3CLYKjLzpF5bFEkmzYzqM= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=P8W/XxLB; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="P8W/XxLB" Received: by smtp.kernel.org (Postfix) with ESMTPSA id AE1F5C32782; Tue, 28 May 2024 09:54:42 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1716890083; bh=UoqEy8pe0oo6Q6KLGXA6s4y3pv5XRjR1eEUiP0TzPYg=; h=From:To:Cc:Subject:Date:From; b=P8W/XxLBNi4IcCSCy0bmbc+Yvf1q2uC+2oqptIgkXrnrcwgqFvc1xRMe4U0/ksgd7 dkHSXB2n8Op0lDnHD8Mb31OW/KMRIw12HHPEIYOnECPF3tByo9rfcQj9nUjh7p3JDe 4f4iI2MF4rNisJWRGntg+URtETUlcA/FIJqERgjLTJN5FBfaftgxctUI61V5wm0Bq8 aP1YA6eB0dV6I9wu3NoGuewBnjZps65c6T0hJ9B07w1IynPY5ags4cfMsOP9uYV4IZ byIrItxkQt0m0JiYDmVmA7X6TVVVqouROYS4rrFDXK2vSKFjC12JDkK9EPRSSQcVcV zqz4sFaMBx46A== From: Jarkko Sakkinen To: linux-integrity@vger.kernel.org Cc: keyrings@vger.kernel.org, James.Bottomley@HansenPartnership.com, Jarkko Sakkinen , Peter Huewe , Jason Gunthorpe , Stefan Berger , Ard Biesheuvel , Mario Limonciello , linux-kernel@vger.kernel.org Subject: [PATCH v2] tpm: Rename TPM2_OA_TMPL to TPM2_OA_NULL_KEY and make it local Date: Tue, 28 May 2024 12:54:33 +0300 Message-ID: <20240528095438.1857-1-jarkko@kernel.org> X-Mailer: git-send-email 2.45.1 Precedence: bulk X-Mailing-List: keyrings@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Rename and document TPM2_OA_TMPL, as originally requested in the patch set review, but left unaddressed without any appropriate reasoning. The new name is TPM2_OA_NULL_KEY, has a documentation and is local only to tpm2-sessions.c. Link: https://lore.kernel.org/linux-integrity/ddbeb8111f48a8ddb0b8fca248dff6cc9d7079b2.camel@HansenPartnership.com/ Link: https://lore.kernel.org/linux-integrity/CZCKTWU6ZCC9.2UTEQPEVICYHL@suppilovahvero/ Signed-off-by: Jarkko Sakkinen --- v2: - linux/tpm.h is not a place for AES_* constants. Move them also to drivers/char/tpm/tpm2-sessions.c. - Remove the comment related to TPM2_OA_TMPL as "key tcg documents" is not a legit xerf, and thus only adds obfuscation. --- drivers/char/tpm/tpm2-sessions.c | 21 +++++++++++++++++++-- include/linux/tpm.h | 15 --------------- 2 files changed, 19 insertions(+), 17 deletions(-) diff --git a/drivers/char/tpm/tpm2-sessions.c b/drivers/char/tpm/tpm2-sessions.c index ea8860661876..907ac9956a78 100644 --- a/drivers/char/tpm/tpm2-sessions.c +++ b/drivers/char/tpm/tpm2-sessions.c @@ -80,6 +80,9 @@ /* maximum number of names the TPM must remember for authorization */ #define AUTH_MAX_NAMES 3 +#define AES_KEY_BYTES AES_KEYSIZE_128 +#define AES_KEY_BITS (AES_KEY_BYTES*8) + static int tpm2_create_primary(struct tpm_chip *chip, u32 hierarchy, u32 *handle, u8 *name); @@ -954,6 +957,20 @@ int tpm2_start_auth_session(struct tpm_chip *chip) } EXPORT_SYMBOL(tpm2_start_auth_session); +/* + * A mask containing the object attributes for the kernel held null primary key + * used in HMAC encryption. For more information on specific attributes look up + * to "8.3 TPMA_OBJECT (Object Attributes)". + */ +#define TPM2_OA_NULL_KEY ( \ + TPM2_OA_NO_DA | \ + TPM2_OA_FIXED_TPM | \ + TPM2_OA_FIXED_PARENT | \ + TPM2_OA_SENSITIVE_DATA_ORIGIN | \ + TPM2_OA_USER_WITH_AUTH | \ + TPM2_OA_DECRYPT | \ + TPM2_OA_RESTRICTED) + /** * tpm2_parse_create_primary() - parse the data returned from TPM_CC_CREATE_PRIMARY * @@ -1018,7 +1035,7 @@ static int tpm2_parse_create_primary(struct tpm_chip *chip, struct tpm_buf *buf, val = tpm_buf_read_u32(buf, &offset_t); /* object properties */ - if (val != TPM2_OA_TMPL) + if (val != TPM2_OA_NULL_KEY) return -EINVAL; /* auth policy (empty) */ @@ -1178,7 +1195,7 @@ static int tpm2_create_primary(struct tpm_chip *chip, u32 hierarchy, tpm_buf_append_u16(&template, TPM_ALG_SHA256); /* object properties */ - tpm_buf_append_u32(&template, TPM2_OA_TMPL); + tpm_buf_append_u32(&template, TPM2_OA_NULL_KEY); /* sauth policy (empty) */ tpm_buf_append_u16(&template, 0); diff --git a/include/linux/tpm.h b/include/linux/tpm.h index b3217200df28..21a67dc9efe8 100644 --- a/include/linux/tpm.h +++ b/include/linux/tpm.h @@ -394,21 +394,6 @@ enum tpm2_object_attributes { TPM2_OA_SIGN = BIT(18), }; -/* - * definitions for the canonical template. These are mandated - * by the TCG key template documents - */ - -#define AES_KEY_BYTES AES_KEYSIZE_128 -#define AES_KEY_BITS (AES_KEY_BYTES*8) -#define TPM2_OA_TMPL (TPM2_OA_NO_DA | \ - TPM2_OA_FIXED_TPM | \ - TPM2_OA_FIXED_PARENT | \ - TPM2_OA_SENSITIVE_DATA_ORIGIN | \ - TPM2_OA_USER_WITH_AUTH | \ - TPM2_OA_DECRYPT | \ - TPM2_OA_RESTRICTED) - enum tpm2_session_attributes { TPM2_SA_CONTINUE_SESSION = BIT(0), TPM2_SA_AUDIT_EXCLUSIVE = BIT(1),