From patchwork Tue Jan 10 14:18:15 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Stefan Berger X-Patchwork-Id: 713277 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Received: from lists.sourceforge.net (lists.sourceforge.net [216.34.181.88]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by ozlabs.org (Postfix) with ESMTPS id 3tyYzg6r03z9t0X for ; Wed, 11 Jan 2017 01:18:55 +1100 (AEDT) Received: from localhost ([127.0.0.1] helo=sfs-ml-2.v29.ch3.sourceforge.com) by sfs-ml-2.v29.ch3.sourceforge.com with esmtp (Exim 4.76) (envelope-from ) id 1cQxGI-00053p-7Q; Tue, 10 Jan 2017 14:18:54 +0000 Received: from sog-mx-2.v43.ch3.sourceforge.com ([172.29.43.192] helo=mx.sourceforge.net) by sfs-ml-2.v29.ch3.sourceforge.com with esmtp (Exim 4.76) (envelope-from ) id 1cQxGG-00053f-J8 for tpmdd-devel@lists.sourceforge.net; Tue, 10 Jan 2017 14:18:52 +0000 X-ACL-Warn: Received: from mx0a-001b2d01.pphosted.com ([148.163.156.1]) by sog-mx-2.v43.ch3.sourceforge.com with esmtps (TLSv1:AES256-SHA:256) (Exim 4.76) id 1cQxGF-00086n-QI for tpmdd-devel@lists.sourceforge.net; Tue, 10 Jan 2017 14:18:52 +0000 Received: from pps.filterd (m0098399.ppops.net [127.0.0.1]) by mx0a-001b2d01.pphosted.com (8.16.0.17/8.16.0.17) with SMTP id v0AEEGtW146109 for ; Tue, 10 Jan 2017 09:18:46 -0500 Received: from e36.co.us.ibm.com (e36.co.us.ibm.com [32.97.110.154]) by mx0a-001b2d01.pphosted.com with ESMTP id 27vvby4nt2-1 (version=TLSv1.2 cipher=AES256-SHA bits=256 verify=NOT) for ; Tue, 10 Jan 2017 09:18:46 -0500 Received: from localhost by e36.co.us.ibm.com with IBM ESMTP SMTP Gateway: Authorized Use Only! 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See http://spamassassin.org/tag/ for more details. -0.3 AWL AWL: Adjusted score from AWL reputation of From: address X-Headers-End: 1cQxGF-00086n-QI Cc: linux-security-module@vger.kernel.org Subject: [tpmdd-devel] [PATCH 05/10] tpm: tpm2_seal_trusted: check size of response before accessing data X-BeenThere: tpmdd-devel@lists.sourceforge.net X-Mailman-Version: 2.1.9 Precedence: list List-Id: Tpm Device Driver maintainance List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , MIME-Version: 1.0 Errors-To: tpmdd-devel-bounces@lists.sourceforge.net Check the size of the response before accessing data in the response packet. This is to avoid accessing data beyond the end of the response. Signed-off-by: Stefan Berger --- drivers/char/tpm/tpm2-cmd.c | 12 +++++++++++- 1 file changed, 11 insertions(+), 1 deletion(-) diff --git a/drivers/char/tpm/tpm2-cmd.c b/drivers/char/tpm/tpm2-cmd.c index 1e704a1..57bb774 100644 --- a/drivers/char/tpm/tpm2-cmd.c +++ b/drivers/char/tpm/tpm2-cmd.c @@ -464,7 +464,7 @@ int tpm2_seal_trusted(struct tpm_chip *chip, { unsigned int blob_len; struct tpm_buf buf; - u32 hash; + u32 hash, rlength; int i; int rc; @@ -533,11 +533,21 @@ int tpm2_seal_trusted(struct tpm_chip *chip, if (rc) goto out; + rlength = be32_to_cpu(((struct tpm2_cmd*)&buf)->header.out.length); + if (rlength < TPM_HEADER_SIZE + 4) { + rc = -EFAULT; + goto out; + } + blob_len = be32_to_cpup((__be32 *) &buf.data[TPM_HEADER_SIZE]); if (blob_len > MAX_BLOB_SIZE) { rc = -E2BIG; goto out; } + if (rlength < TPM_HEADER_SIZE + 4 + blob_len) { + rc = -EFAULT; + goto out; + } memcpy(payload->blob, &buf.data[TPM_HEADER_SIZE + 4], blob_len); payload->blob_len = blob_len;