From nobody Tue Nov 26 08:39:55 2024 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 CBE741CF7B1; Mon, 21 Oct 2024 05:39:55 +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=1729489195; cv=none; b=jQPjkfdjb+SkXkNWgFuQYWzZl+6r32bIUuz6UoDPgw3p6RPYHDC0OEGUtHp/xvk4sSCriUtKxKdi0A24zb2JxV3Uh1g2YckwPcXEUBrNhWk0OTUNVzJCZkploPyXdOTJ00xb8Kv57svjhjPbLDwoDpo8iQU+6XqZcTN4YfTncBM= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1729489195; c=relaxed/simple; bh=EKbaumhrez1Xq9qGRGrCO5GSCxZW2UvHqIoq1v904RI=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=VQ0gb/OZi0AJfn05t8rM7ZrMqyzdhvsLNWKHhjyXE0Joc1nolsGHwhIoZRv+LHr+zbcAK+V6kGjmWec4MjO/BJgojHODz1OSIGqseFrd2l2afz8PLbZy7/lEp2fsNq2AnWwKHd4nfml20/HoAl9bIbR+FTMFvNRp7bhQyEnrqnc= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=MV++9lG2; 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="MV++9lG2" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 3470CC4CEC3; Mon, 21 Oct 2024 05:39:55 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1729489195; bh=EKbaumhrez1Xq9qGRGrCO5GSCxZW2UvHqIoq1v904RI=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=MV++9lG2tpZXVhTx+hx83+MRldld4SqTTvJ480HZ+28/awqvvh3LIV7oEA7i2DeiY g6b0ynx2otMSxNuzNvSLcqSU6ZtRit1kZM3QOcJFEASOdsZFj1N5T8qENfJu6Lc7Al TLMNDrhQFJKJZowpSXLxQAOYai2ulpzh0D16ZcT7CQQq5mQbqDcxIprBVuraznXO0n q7rdJh+9Wv2b+QAbOyGlSTuk9NTEWNRgk1JSzTer831U/b/8FiL+ftumHd3MXZ13d4 h/EX091bYWGqJJt0YR5c/nmCVOpza0tcDjexGPS9JbUTpHLqSGNSSydgDK0ZjfTNiG 9E3EfrXP58a1w== From: Jarkko Sakkinen To: linux-integrity@vger.kernel.org, Peter Huewe , Jarkko Sakkinen , Jason Gunthorpe Cc: David Howells , James Bottomley , Mimi Zohar , Roberto Sassu , Stefan Berger , linux-kernel@vger.kernel.org, Pengyu Ma , stable@vger.kernel.org Subject: [PATCH v7 5/5] tpm: flush the auth session only when /dev/tpm0 is open Date: Mon, 21 Oct 2024 08:39:19 +0300 Message-ID: <20241021053921.33274-6-jarkko@kernel.org> X-Mailer: git-send-email 2.47.0 In-Reply-To: <20241021053921.33274-1-jarkko@kernel.org> References: <20241021053921.33274-1-jarkko@kernel.org> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Instead of flushing and reloading the auth session for every single transaction, keep the session open unless /dev/tpm0 is used. In practice this means applying TPM2_SA_CONTINUE_SESSION to the session attributes. Flush the session always when /dev/tpm0 is written. Reported-by: Pengyu Ma Closes: https://bugzilla.kernel.org/show_bug.cgi?id=3D219229 Cc: stable@vger.kernel.org # v6.10+ Fixes: 7ca110f2679b ("tpm: Address !chip->auth in tpm_buf_append_hmac_sessi= on*()") Tested-by: Pengyu Ma Signed-off-by: Jarkko Sakkinen --- v5: - No changes. v4: - Changed as bug. v3: - Refined the commit message. - Removed the conditional for applying TPM2_SA_CONTINUE_SESSION only when /dev/tpm0 is open. It is not required as the auth session is flushed, not saved. v2: - A new patch. --- drivers/char/tpm/tpm-chip.c | 1 + drivers/char/tpm/tpm-dev-common.c | 1 + drivers/char/tpm/tpm-interface.c | 1 + drivers/char/tpm/tpm2-sessions.c | 3 +++ 4 files changed, 6 insertions(+) diff --git a/drivers/char/tpm/tpm-chip.c b/drivers/char/tpm/tpm-chip.c index 0ea00e32f575..7a6bb30d1f32 100644 --- a/drivers/char/tpm/tpm-chip.c +++ b/drivers/char/tpm/tpm-chip.c @@ -680,6 +680,7 @@ void tpm_chip_unregister(struct tpm_chip *chip) rc =3D tpm_try_get_ops(chip); if (!rc) { if (chip->flags & TPM_CHIP_FLAG_TPM2) { + tpm2_end_auth_session(chip); tpm2_flush_context(chip, chip->null_key); chip->null_key =3D 0; } diff --git a/drivers/char/tpm/tpm-dev-common.c b/drivers/char/tpm/tpm-dev-c= ommon.c index 4eaa8e05c291..a3ed7a99a394 100644 --- a/drivers/char/tpm/tpm-dev-common.c +++ b/drivers/char/tpm/tpm-dev-common.c @@ -29,6 +29,7 @@ static ssize_t tpm_dev_transmit(struct tpm_chip *chip, st= ruct tpm_space *space, =20 #ifdef CONFIG_TCG_TPM2_HMAC if (chip->flags & TPM_CHIP_FLAG_TPM2) { + tpm2_end_auth_session(chip); tpm2_flush_context(chip, chip->null_key); chip->null_key =3D 0; } diff --git a/drivers/char/tpm/tpm-interface.c b/drivers/char/tpm/tpm-interf= ace.c index bfa47d48b0f2..2363018fa8fb 100644 --- a/drivers/char/tpm/tpm-interface.c +++ b/drivers/char/tpm/tpm-interface.c @@ -381,6 +381,7 @@ int tpm_pm_suspend(struct device *dev) if (!rc) { if (chip->flags & TPM_CHIP_FLAG_TPM2) { #ifdef CONFIG_TCG_TPM2_HMAC + tpm2_end_auth_session(chip); tpm2_flush_context(chip, chip->null_key); chip->null_key =3D 0; #endif diff --git a/drivers/char/tpm/tpm2-sessions.c b/drivers/char/tpm/tpm2-sessi= ons.c index 6e52785de9fd..a7079c7ec6d1 100644 --- a/drivers/char/tpm/tpm2-sessions.c +++ b/drivers/char/tpm/tpm2-sessions.c @@ -333,6 +333,9 @@ void tpm_buf_append_hmac_session(struct tpm_chip *chip,= struct tpm_buf *buf, } =20 #ifdef CONFIG_TCG_TPM2_HMAC + /* The first write to /dev/tpm{rm0} will flush the session. */ + attributes |=3D TPM2_SA_CONTINUE_SESSION; + /* * The Architecture Guide requires us to strip trailing zeros * before computing the HMAC --=20 2.47.0