From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-6.6 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id E55BFC43441 for ; Sun, 11 Nov 2018 23:55:19 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id AEB6F20839 for ; Sun, 11 Nov 2018 23:55:19 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=kernel.org header.i=@kernel.org header.b="FIWJ8XMU" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org AEB6F20839 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=linuxfoundation.org Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1732987AbeKLJpj (ORCPT ); Mon, 12 Nov 2018 04:45:39 -0500 Received: from mail.kernel.org ([198.145.29.99]:37238 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1732619AbeKLIST (ORCPT ); Mon, 12 Nov 2018 03:18:19 -0500 Received: from localhost (unknown [206.108.79.134]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id DDCEB215EA; Sun, 11 Nov 2018 22:28:23 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1541975303; bh=OxqoB3U0UqRa9EepOiuIIJg50XpkAyFB1Vz90F3aV+M=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=FIWJ8XMUUELe1sewVNaMjsVQUeGuWlw/ZNaWKjSdckDTI2b04LFwugVq7/0jaCvYy XtVBGe207a3AmgKvpSjFwRd8CFn6go9Vhz2N8QhenZxR484T7vCtc9N6L6ipzibbBW FMpc027YDXMMN41ZDYukLYxwU1XdbMySmz9U3XPg= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Jarkko Sakkinen Subject: [PATCH 4.19 268/361] tpm: fix response size validation in tpm_get_random() Date: Sun, 11 Nov 2018 14:20:15 -0800 Message-Id: <20181111221654.813027669@linuxfoundation.org> X-Mailer: git-send-email 2.19.1 In-Reply-To: <20181111221619.915519183@linuxfoundation.org> References: <20181111221619.915519183@linuxfoundation.org> User-Agent: quilt/0.65 X-stable: review MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 4.19-stable review patch. If anyone has any objections, please let me know. ------------------ From: Jarkko Sakkinen commit 84b59f6487d82d3ab4247a099aba66d4d17e8b08 upstream. When checking whether the response is large enough to be able to contain the received random bytes in tpm_get_random() and tpm2_get_random(), they fail to take account the header size, which should be added to the minimum size. This commit fixes this issue. Cc: stable@vger.kernel.org Fixes: c659af78eb7b ("tpm: Check size of response before accessing data") Signed-off-by: Jarkko Sakkinen Signed-off-by: Greg Kroah-Hartman --- drivers/char/tpm/tpm-interface.c | 3 ++- drivers/char/tpm/tpm2-cmd.c | 4 +++- 2 files changed, 5 insertions(+), 2 deletions(-) --- a/drivers/char/tpm/tpm-interface.c +++ b/drivers/char/tpm/tpm-interface.c @@ -1322,7 +1322,8 @@ int tpm_get_random(struct tpm_chip *chip } rlength = be32_to_cpu(tpm_cmd.header.out.length); - if (rlength < offsetof(struct tpm_getrandom_out, rng_data) + + if (rlength < TPM_HEADER_SIZE + + offsetof(struct tpm_getrandom_out, rng_data) + recd) { total = -EFAULT; break; --- a/drivers/char/tpm/tpm2-cmd.c +++ b/drivers/char/tpm/tpm2-cmd.c @@ -329,7 +329,9 @@ int tpm2_get_random(struct tpm_chip *chi &buf.data[TPM_HEADER_SIZE]; recd = min_t(u32, be16_to_cpu(out->size), num_bytes); if (tpm_buf_length(&buf) < - offsetof(struct tpm2_get_random_out, buffer) + recd) { + TPM_HEADER_SIZE + + offsetof(struct tpm2_get_random_out, buffer) + + recd) { err = -EFAULT; goto out; }