From patchwork Tue Jan 24 17:55:08 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: James Bottomley X-Patchwork-Id: 13114435 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id A815FC54EAA for ; Tue, 24 Jan 2023 17:56:39 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233724AbjAXR4h (ORCPT ); Tue, 24 Jan 2023 12:56:37 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:51536 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233699AbjAXR4g (ORCPT ); Tue, 24 Jan 2023 12:56:36 -0500 Received: from bedivere.hansenpartnership.com (bedivere.hansenpartnership.com [96.44.175.130]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 80E2E113F0; Tue, 24 Jan 2023 09:56:32 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=hansenpartnership.com; s=20151216; t=1674582992; bh=0fKM6teWgXFzLqKvbqCFfSsEagmzVudyiJTlD+LAY/0=; h=From:To:Subject:Date:Message-Id:In-Reply-To:References:From; b=F3aDW1/XCBgja65ZbxKZLye2j1vJy9DkrnL1De4FfbgPIl6n7TttHt0Hv386oSDn0 YUAaXrCCpxrWOYfhL9x+08Y929v9LxUVAzfenA2pc9wXJ4jCCzDEHxfx5KlafEnVob HV2kamCqi1VIzMV0eSEI0wOfMm3CbH6NRTj5ourg= Received: from localhost (localhost [127.0.0.1]) by bedivere.hansenpartnership.com (Postfix) with ESMTP id 37D9212861A7; Tue, 24 Jan 2023 12:56:32 -0500 (EST) Received: from bedivere.hansenpartnership.com ([127.0.0.1]) by localhost (bedivere.hansenpartnership.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id kWPJpHpIblPw; Tue, 24 Jan 2023 12:56:32 -0500 (EST) Received: from lingrow.int.hansenpartnership.com (unknown [153.66.160.227]) by bedivere.hansenpartnership.com (Postfix) with ESMTP id 9BB4B12818AC; Tue, 24 Jan 2023 12:56:31 -0500 (EST) From: James Bottomley To: linux-integrity@vger.kernel.org Cc: Jarkko Sakkinen , keyrings@vger.kernel.org, Ard Biesheuvel Subject: [PATCH v2 03/11] tpm: add cursor based buffer functions for response parsing Date: Tue, 24 Jan 2023 12:55:08 -0500 Message-Id: <20230124175516.5984-4-James.Bottomley@HansenPartnership.com> X-Mailer: git-send-email 2.35.3 In-Reply-To: <20230124175516.5984-1-James.Bottomley@HansenPartnership.com> References: <20230124175516.5984-1-James.Bottomley@HansenPartnership.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-integrity@vger.kernel.org Once we have encryption and authentication, marshalling and unmarshalling sessions becomes hugely complex. Add cursor based functions which update the current pointer to make response parsing easier. Signed-off-by: James Bottomley --- drivers/char/tpm/tpm-buf.c | 29 +++++++++++++++++++++++++++++ include/linux/tpm.h | 3 +++ 2 files changed, 32 insertions(+) diff --git a/drivers/char/tpm/tpm-buf.c b/drivers/char/tpm/tpm-buf.c index f1d48f22d4b4..046b00bf7a81 100644 --- a/drivers/char/tpm/tpm-buf.c +++ b/drivers/char/tpm/tpm-buf.c @@ -7,6 +7,8 @@ #include #include +#include + static int __tpm_buf_init(struct tpm_buf *buf) { buf->data = (u8 *)__get_free_page(GFP_KERNEL); @@ -155,3 +157,30 @@ void tpm_buf_append_2b(struct tpm_buf *buf, struct tpm_buf *tpm2b) tpm_buf_reset_int(tpm2b); } EXPORT_SYMBOL_GPL(tpm_buf_append_2b); + +/* functions for unmarshalling data and moving the cursor */ +u8 tpm_get_inc_u8(const u8 **ptr) +{ + return *((*ptr)++); +} +EXPORT_SYMBOL_GPL(tpm_get_inc_u8); + +u16 tpm_get_inc_u16(const u8 **ptr) +{ + u16 val; + + val = get_unaligned_be16(*ptr); + *ptr += sizeof(val); + return val; +} +EXPORT_SYMBOL_GPL(tpm_get_inc_u16); + +u32 tpm_get_inc_u32(const u8 **ptr) +{ + u32 val; + + val = get_unaligned_be32(*ptr); + *ptr += sizeof(val); + return val; +} +EXPORT_SYMBOL_GPL(tpm_get_inc_u32); diff --git a/include/linux/tpm.h b/include/linux/tpm.h index f2d4dab6d832..f7cff1d114b0 100644 --- a/include/linux/tpm.h +++ b/include/linux/tpm.h @@ -335,6 +335,9 @@ void tpm_buf_append_u8(struct tpm_buf *buf, const u8 value); void tpm_buf_append_u16(struct tpm_buf *buf, const u16 value); void tpm_buf_append_u32(struct tpm_buf *buf, const u32 value); void tpm_buf_append_2b(struct tpm_buf *buf, struct tpm_buf *tpm2b); +u8 tpm_get_inc_u8(const u8 **ptr); +u16 tpm_get_inc_u16(const u8 **ptr); +u32 tpm_get_inc_u32(const u8 **ptr); /* * Check if TPM device is in the firmware upgrade mode.