From patchwork Fri Jun 22 06:50:00 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Ricardo Schwarzmeier X-Patchwork-Id: 10481371 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id A4CA360388 for ; Fri, 22 Jun 2018 06:56:44 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 95EDF28D8A for ; Fri, 22 Jun 2018 06:56:44 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 8A98628E13; Fri, 22 Jun 2018 06:56:44 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-7.8 required=2.0 tests=BAYES_00,DKIM_SIGNED, MAILING_LIST_MULTI, RCVD_IN_DNSWL_HI, T_DKIM_INVALID autolearn=ham version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 2DC2528D8A for ; Fri, 22 Jun 2018 06:56:44 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751235AbeFVG4n (ORCPT ); Fri, 22 Jun 2018 02:56:43 -0400 Received: from smtp2.infineon.com ([217.10.52.18]:7649 "EHLO smtp2.infineon.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751213AbeFVG4l (ORCPT ); Fri, 22 Jun 2018 02:56:41 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=simple/simple; d=infineon.com; i=@infineon.com; q=dns/txt; s=IFXMAIL; t=1529650601; x=1561186601; h=from:to:cc:subject:date:message-id:mime-version; bh=p6RZdkXjDcaaSLAxn5RUWGDMAirDy0CSHcG3vwY5WhQ=; b=hzF4VPwZWtwQyAUApUNyRibEX60t8+pV4/j8Zma+DoPKalM6aGyC39wf pvhTtcdTo4DurIUnunNUxSRWtEdqcFXrAD+WK9vnpP/TSNlmfAySoJFyx 0kX4Mi+AQL5OGl5Icgmg0NY1hDEXK3fazOC4+FuaMXmVcBLx4VVrtBMG+ E=; X-SBRS: None X-IronPort-AV: E=McAfee;i="5900,7806,8931"; a="69503222" X-IronPort-AV: E=Sophos;i="5.51,255,1526335200"; d="scan'208";a="69503222" Received: from unknown (HELO mucxv002.muc.infineon.com) ([172.23.11.17]) by smtp2.infineon.com with ESMTP/TLS/AES256-GCM-SHA384; 22 Jun 2018 08:56:40 +0200 Received: from MUCSE706.infineon.com (MUCSE706.infineon.com [172.23.7.80]) by mucxv002.muc.infineon.com (Postfix) with ESMTPS; Fri, 22 Jun 2018 08:56:40 +0200 (CEST) Received: from MUCSE716.infineon.com (172.23.7.67) by MUCSE706.infineon.com (172.23.7.80) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA384_P256) id 15.1.1466.3; Fri, 22 Jun 2018 08:56:39 +0200 Received: from schwaric-VirtualBox.agb.infineon.com (172.23.8.247) by MUCSE716.infineon.com (172.23.7.67) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA384_P256) id 15.1.1466.3; Fri, 22 Jun 2018 08:56:39 +0200 From: Ricardo Schwarzmeier To: CC: , , , , , , Ricardo Schwarzmeier Subject: [PATCH v4] tpm: Return the actual size when receiving an unsupported command Date: Fri, 22 Jun 2018 08:50:00 +0200 Message-ID: <20180622065000.31139-1-Ricardo.Schwarzmeier@infineon.com> X-Mailer: git-send-email 2.17.1 MIME-Version: 1.0 X-Originating-IP: [172.23.8.247] X-ClientProxiedBy: MUCSE705.infineon.com (172.23.7.79) To MUCSE716.infineon.com (172.23.7.67) Sender: linux-integrity-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-integrity@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP The userpace expects to read the number of bytes stated in the header. Returning the size of the buffer instead would be unexpected. Fixes: 095531f891e6 ("tpm: return a TPM_RC_COMMAND_CODE response if command is not implemented") Signed-off-by: Ricardo Schwarzmeier --- drivers/char/tpm/tpm-interface.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/char/tpm/tpm-interface.c b/drivers/char/tpm/tpm-interface.c index e32f6e85dc6d..7f2e2d54894d 100644 --- a/drivers/char/tpm/tpm-interface.c +++ b/drivers/char/tpm/tpm-interface.c @@ -423,7 +423,7 @@ static ssize_t tpm_try_transmit(struct tpm_chip *chip, header->tag = cpu_to_be16(TPM2_ST_NO_SESSIONS); header->return_code = cpu_to_be32(TPM2_RC_COMMAND_CODE | TSS2_RESMGR_TPM_RC_LAYER); - return bufsiz; + return sizeof(*header); } if (bufsiz > TPM_BUFSIZE)