From patchwork Sat Mar 26 23:53:18 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Masami Hiramatsu (Google)" X-Patchwork-Id: 12792696 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 26A8DC433F5 for ; Sat, 26 Mar 2022 23:53:34 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230192AbiCZXzJ (ORCPT ); Sat, 26 Mar 2022 19:55:09 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:55008 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230178AbiCZXzJ (ORCPT ); Sat, 26 Mar 2022 19:55:09 -0400 Received: from ams.source.kernel.org (ams.source.kernel.org [145.40.68.75]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id B9E3A2DD47; Sat, 26 Mar 2022 16:53:26 -0700 (PDT) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ams.source.kernel.org (Postfix) with ESMTPS id 08B2CB80B3F; Sat, 26 Mar 2022 23:53:25 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 65069C340F0; Sat, 26 Mar 2022 23:53:20 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1648338803; bh=SFAoQoDCZH9+H/cOjK0kYrO4Z6OtnYYL4lqW44mHkAk=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=Rgjq4kDTzv0x087ZZZGxYa4cBD9L/g/GyfOmArtVkaKzXAJHQJz/PeLS5URqDrhTO yhNQGANls19RviIlIqovJz9ZnNXOR0owPJHwmnBLl3Fh1AALz31XJSdbb5/2+P2ViR u1igf5ulkC5uW1Qjj1OVCgGeBFlM7T/BtlOk3EqrmWnbH6UEmopoqVjiw7Q1bsQhT2 a17zbuVzJ9mn5g1wsRMSbe9APw2+BNb+nh3/xhU60aW+Du9DmE6tRWoRBFCqa+/NdN dOn+tZJe4IqxpNkZBEwQq6k+6CzjyOf/Z7hNCS3t3jRUA3V3HLHiog92c7Dyc4zYPH 8yFs2zv8gYvCw== From: Masami Hiramatsu To: Steven Rostedt Cc: Masami Hiramatsu , Padmanabha Srinivasaiah , LKML , Jonathan Corbet , linux-doc@vger.kernel.org, Randy Dunlap , Nick Desaulniers , Sami Tolvanen , Nathan Chancellor , llvm@lists.linux.dev, Masahiro Yamada , Linux Kbuild mailing list Subject: [PATCH v4 1/3] bootconfig: Check the checksum before removing the bootconfig from initrd Date: Sun, 27 Mar 2022 08:53:18 +0900 Message-Id: <164833879781.2575750.8980132935605494939.stgit@devnote2> X-Mailer: git-send-email 2.25.1 In-Reply-To: <164833878595.2575750.1483106296151574233.stgit@devnote2> References: <164833878595.2575750.1483106296151574233.stgit@devnote2> User-Agent: StGit/0.19 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-kbuild@vger.kernel.org Check the bootconfig's checksum before removing the bootcinfig data from initrd to avoid modifying initrd by mistake. This will also simplifies the get_boot_config_from_initrd() interface. Signed-off-by: Masami Hiramatsu --- init/main.c | 22 ++++++++++------------ 1 file changed, 10 insertions(+), 12 deletions(-) diff --git a/init/main.c b/init/main.c index 560f45c27ffe..4f3ba3b84e34 100644 --- a/init/main.c +++ b/init/main.c @@ -265,7 +265,7 @@ static int __init loglevel(char *str) early_param("loglevel", loglevel); #ifdef CONFIG_BLK_DEV_INITRD -static void * __init get_boot_config_from_initrd(u32 *_size, u32 *_csum) +static void * __init get_boot_config_from_initrd(u32 *_size) { u32 size, csum; char *data; @@ -299,17 +299,20 @@ static void * __init get_boot_config_from_initrd(u32 *_size, u32 *_csum) return NULL; } + if (xbc_calc_checksum(data, size) != csum) { + pr_err("bootconfig checksum failed\n"); + return NULL; + } + /* Remove bootconfig from initramfs/initrd */ initrd_end = (unsigned long)data; if (_size) *_size = size; - if (_csum) - *_csum = csum; return data; } #else -static void * __init get_boot_config_from_initrd(u32 *_size, u32 *_csum) +static void * __init get_boot_config_from_initrd(u32 *_size) { return NULL; } @@ -408,12 +411,12 @@ static void __init setup_boot_config(void) static char tmp_cmdline[COMMAND_LINE_SIZE] __initdata; const char *msg; int pos; - u32 size, csum; + u32 size; char *data, *err; int ret; /* Cut out the bootconfig data even if we have no bootconfig option */ - data = get_boot_config_from_initrd(&size, &csum); + data = get_boot_config_from_initrd(&size); strlcpy(tmp_cmdline, boot_command_line, COMMAND_LINE_SIZE); err = parse_args("bootconfig", tmp_cmdline, NULL, 0, 0, 0, NULL, @@ -437,11 +440,6 @@ static void __init setup_boot_config(void) return; } - if (xbc_calc_checksum(data, size) != csum) { - pr_err("bootconfig checksum failed\n"); - return; - } - ret = xbc_init(data, size, &msg, &pos); if (ret < 0) { if (pos < 0) @@ -470,7 +468,7 @@ static void __init exit_boot_config(void) static void __init setup_boot_config(void) { /* Remove bootconfig data from initrd */ - get_boot_config_from_initrd(NULL, NULL); + get_boot_config_from_initrd(NULL); } static int __init warn_bootconfig(char *str)