From patchwork Thu Feb 16 19:25:14 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jarkko Sakkinen X-Patchwork-Id: 9578177 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 9D8A3600C5 for ; Thu, 16 Feb 2017 19:25:57 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 91AF028665 for ; Thu, 16 Feb 2017 19:25:57 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 853B628669; Thu, 16 Feb 2017 19:25:57 +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=-6.9 required=2.0 tests=BAYES_00,RCVD_IN_DNSWL_HI autolearn=unavailable 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 438BC28665 for ; Thu, 16 Feb 2017 19:25:56 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932699AbdBPTZn (ORCPT ); Thu, 16 Feb 2017 14:25:43 -0500 Received: from mga04.intel.com ([192.55.52.120]:27546 "EHLO mga04.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932586AbdBPTZk (ORCPT ); Thu, 16 Feb 2017 14:25:40 -0500 Received: from orsmga001.jf.intel.com ([10.7.209.18]) by fmsmga104.fm.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 16 Feb 2017 11:25:39 -0800 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.35,169,1484035200"; d="scan'208";a="1096542100" Received: from mvesteri-mobl1.ger.corp.intel.com (HELO localhost) ([10.252.27.48]) by orsmga001.jf.intel.com with ESMTP; 16 Feb 2017 11:25:35 -0800 From: Jarkko Sakkinen To: tpmdd-devel@lists.sourceforge.net Cc: linux-security-module@vger.kernel.org, James.Bottomley@HansenPartnership.com, dhowells@redhat.com, Jarkko Sakkinen , Peter Huewe , Marcel Selhorst , Jason Gunthorpe , linux-kernel@vger.kernel.org (open list) Subject: [PATCH v2 1/7] tpm: move length validation to tpm_transmit() Date: Thu, 16 Feb 2017 21:25:14 +0200 Message-Id: <20170216192529.25467-2-jarkko.sakkinen@linux.intel.com> X-Mailer: git-send-email 2.9.3 In-Reply-To: <20170216192529.25467-1-jarkko.sakkinen@linux.intel.com> References: <20170216192529.25467-1-jarkko.sakkinen@linux.intel.com> Sender: owner-linux-security-module@vger.kernel.org Precedence: bulk List-ID: X-Virus-Scanned: ClamAV using ClamSMTP Check that the length matches the length reported by the response header already in tpm_transmit() to improve validation. Signed-off-by: Jarkko Sakkinen --- drivers/char/tpm/tpm-interface.c | 20 ++++++++++++-------- 1 file changed, 12 insertions(+), 8 deletions(-) diff --git a/drivers/char/tpm/tpm-interface.c b/drivers/char/tpm/tpm-interface.c index bd2128e..708d356 100644 --- a/drivers/char/tpm/tpm-interface.c +++ b/drivers/char/tpm/tpm-interface.c @@ -343,6 +343,7 @@ EXPORT_SYMBOL_GPL(tpm_calc_ordinal_duration); ssize_t tpm_transmit(struct tpm_chip *chip, const u8 *buf, size_t bufsiz, unsigned int flags) { + const struct tpm_output_header *header = (void *)buf; ssize_t rc; u32 count, ordinal; unsigned long stop; @@ -406,9 +407,18 @@ ssize_t tpm_transmit(struct tpm_chip *chip, const u8 *buf, size_t bufsiz, out_recv: rc = chip->ops->recv(chip, (u8 *) buf, bufsiz); - if (rc < 0) + if (rc < 0) { dev_err(&chip->dev, "tpm_transmit: tpm_recv: error %zd\n", rc); + goto out; + } else if (rc < TPM_HEADER_SIZE) { + rc = -EFAULT; + goto out; + } + + if (rc != be32_to_cpu(header->length)) + goto out; + out: if (chip->dev.parent) pm_runtime_put_sync(chip->dev.parent); @@ -438,19 +448,13 @@ ssize_t tpm_transmit_cmd(struct tpm_chip *chip, const void *buf, size_t bufsiz, size_t min_rsp_body_length, unsigned int flags, const char *desc) { - const struct tpm_output_header *header; + const struct tpm_output_header *header = buf; int err; ssize_t len; len = tpm_transmit(chip, (const u8 *)buf, bufsiz, flags); if (len < 0) return len; - else if (len < TPM_HEADER_SIZE) - return -EFAULT; - - header = buf; - if (len != be32_to_cpu(header->length)) - return -EFAULT; err = be32_to_cpu(header->return_code); if (err != 0 && desc)