From patchwork Wed Jul 3 17:08:11 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jarkko Sakkinen X-Patchwork-Id: 13722607 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 392AA170836; Wed, 3 Jul 2024 17:08:30 +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=1720026511; cv=none; b=Q7M3BHYRMpEYwmFiTDHK5f5nwyahadcCeHCTa8qXa2tUyq7HDvexnrhiIgCwrUOYmhsT5QyTclCmlPCmvJRyZMS+aEvhWBpJDA9azCx0OBhh9lcEJPXohM0k7fzTXGT4HBRWtSjxWOH7cA5afjdERHZd4y+8vgoSTc46ClM6Ob4= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1720026511; c=relaxed/simple; bh=Bh1WZOoD8rKJfSE9pl8waPuK6bvUrIYjnIk14Lhl74Q=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=MJSe9NQ5iyvtgeEc83hzdmLLqsodeX5Ywv71umE8W7dd5E+GpCIUU21rCh26vxVj25kS+B+BzfhQZ1fBuzxQUQQddX5Gr5abkI4dcR90WLAkDtu4Nsb/e4MiT5Vfd5nNVqGDTxL5YaYHLj3xeTNN0wlcpZ1SrMQRXwGJw0+nyNI= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=iFpRZ89b; 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="iFpRZ89b" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 685BFC2BD10; Wed, 3 Jul 2024 17:08:30 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1720026510; bh=Bh1WZOoD8rKJfSE9pl8waPuK6bvUrIYjnIk14Lhl74Q=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=iFpRZ89b0KtwSS9waMgMXui/2fnOZZ9z3NItxY0ddnZwXlmeMZgST1I9v3aVuofs0 xvazMkI6nYVX9UpTDlhJARenBQ2LA63SzrLu8q8cSOA7ttA1tuLq7YDjwn6j+yiLjV TBxaLIKyTxqA4s2C9LCvrThwUwzHyFxoXEgysCz/gD8K7eaziOB+E8XsgIWWQol+lt II9ity4St4acMIpr54/iVktEPX8xXmACfsjiuIz/iXNiNyjxo0cT8eL8J+0rqZMIQ7 ncp0DlIF0qQfxBPmMOt/8dz5rAImuq1IvvrcKfY01gpPGEEhS0JSqkSh+as9OWZm1o qI/Dp2XzIJANQ== From: Jarkko Sakkinen To: linux-integrity@vger.kernel.org Cc: Jarkko Sakkinen , stable@vger.kernel.org, Stefan Berger , Peter Huewe , Jason Gunthorpe , James Bottomley , Mimi Zohar , David Howells , Paul Moore , James Morris , "Serge E. Hallyn" , Ard Biesheuvel , linux-kernel@vger.kernel.org, keyrings@vger.kernel.org, linux-security-module@vger.kernel.org Subject: [PATCH 1/3] tpm: Address !chip->auth in tpm2_*_auth_session() Date: Wed, 3 Jul 2024 20:08:11 +0300 Message-ID: <20240703170815.1494625-2-jarkko@kernel.org> X-Mailer: git-send-email 2.45.2 In-Reply-To: <20240703170815.1494625-1-jarkko@kernel.org> References: <20240703170815.1494625-1-jarkko@kernel.org> Precedence: bulk X-Mailing-List: keyrings@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Unless tpm_chip_bootstrap() was called by the driver, !chip->auth can cause a null derefence in tpm2_*_auth_session(). Thus, address !chip->auth in tpm2_*_auth_session(). Cc: stable@vger.kernel.org # v6.9+ Reported-by: Stefan Berger Closes: https://lore.kernel.org/linux-integrity/20240617193408.1234365-1-stefanb@linux.ibm.com/ Fixes: 699e3efd6c64 ("tpm: Add HMAC session start and end functions") Signed-off-by: Jarkko Sakkinen --- drivers/char/tpm/tpm2-sessions.c | 14 ++++++++++++-- 1 file changed, 12 insertions(+), 2 deletions(-) diff --git a/drivers/char/tpm/tpm2-sessions.c b/drivers/char/tpm/tpm2-sessions.c index 907ac9956a78..d94b14757452 100644 --- a/drivers/char/tpm/tpm2-sessions.c +++ b/drivers/char/tpm/tpm2-sessions.c @@ -824,8 +824,13 @@ EXPORT_SYMBOL(tpm_buf_check_hmac_response); */ void tpm2_end_auth_session(struct tpm_chip *chip) { - tpm2_flush_context(chip, chip->auth->handle); - memzero_explicit(chip->auth, sizeof(*chip->auth)); + struct tpm2_auth *auth = chip->auth; + + if (!auth) + return; + + tpm2_flush_context(chip, auth->handle); + memzero_explicit(auth, sizeof(*auth)); } EXPORT_SYMBOL(tpm2_end_auth_session); @@ -907,6 +912,11 @@ int tpm2_start_auth_session(struct tpm_chip *chip) int rc; u32 null_key; + if (!auth) { + pr_warn_once("%s: encryption is not active\n", __func__); + return 0; + } + rc = tpm2_load_null(chip, &null_key); if (rc) goto out;