From patchwork Fri Dec 2 06:05:20 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Ping-Ke Shih X-Patchwork-Id: 630621 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 11395C47088 for ; Fri, 2 Dec 2022 06:06:39 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232214AbiLBGGh (ORCPT ); Fri, 2 Dec 2022 01:06:37 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:59332 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231195AbiLBGGf (ORCPT ); Fri, 2 Dec 2022 01:06:35 -0500 Received: from rtits2.realtek.com.tw (rtits2.realtek.com [211.75.126.72]) by lindbergh.monkeyblade.net (Postfix) with ESMTP id 30F9EDC858 for ; Thu, 1 Dec 2022 22:06:31 -0800 (PST) Authenticated-By: X-SpamFilter-By: ArmorX SpamTrap 5.77 with qID 2B265cH52001505, This message is accepted by code: ctloc85258 Received: from mail.realtek.com (rtexh36506.realtek.com.tw[172.21.6.27]) by rtits2.realtek.com.tw (8.15.2/2.81/5.90) with ESMTPS id 2B265cH52001505 (version=TLSv1.2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128 verify=FAIL); Fri, 2 Dec 2022 14:05:38 +0800 Received: from RTEXMBS04.realtek.com.tw (172.21.6.97) by RTEXH36506.realtek.com.tw (172.21.6.27) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2507.9; Fri, 2 Dec 2022 14:06:24 +0800 Received: from localhost (172.21.69.188) by RTEXMBS04.realtek.com.tw (172.21.6.97) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2375.7; Fri, 2 Dec 2022 14:06:23 +0800 From: Ping-Ke Shih To: CC: , Subject: [PATCH 1/2] wifi: rtw89: don't request partial firmware if SECURITY_LOADPIN_ENFORCE Date: Fri, 2 Dec 2022 14:05:20 +0800 Message-ID: <20221202060521.501512-2-pkshih@realtek.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20221202060521.501512-1-pkshih@realtek.com> References: <20221202060521.501512-1-pkshih@realtek.com> MIME-Version: 1.0 X-Originating-IP: [172.21.69.188] X-ClientProxiedBy: RTEXMBS02.realtek.com.tw (172.21.6.95) To RTEXMBS04.realtek.com.tw (172.21.6.97) X-KSE-ServerInfo: RTEXMBS04.realtek.com.tw, 9 X-KSE-AntiSpam-Interceptor-Info: trusted connection X-KSE-Antiphishing-Info: Clean X-KSE-Antiphishing-ScanningType: Deterministic X-KSE-Antiphishing-Method: None X-KSE-Antiphishing-Bases: 12/02/2022 05:46:00 X-KSE-AttachmentFiltering-Interceptor-Info: no applicable attachment filtering rules found X-KSE-Antivirus-Interceptor-Info: scan successful X-KSE-Antivirus-Info: =?big5_tw?b?Q2xlYW4sIGJhc2VzOiAyMDIyLzEyLzIgpFekyCAwMToy?= =?big5_tw?b?MDowMA==?= X-KSE-BulkMessagesFiltering-Scan-Result: protection disabled Precedence: bulk List-ID: X-Mailing-List: linux-wireless@vger.kernel.org From: Zong-Zhe Yang Kernel logs on platform enabling SECURITY_LOADPIN_ENFORCE ------ ``` LoadPin: firmware old-api-denied obj= pid=810 cmdline="modprobe -q -- rtw89_8852ce" rtw89_8852ce 0000:01:00.0: loading /lib/firmware/rtw89/rtw8852c_fw.bin failed with error -1 rtw89_8852ce 0000:01:00.0: Direct firmware load for rtw89/rtw8852c_fw.bin failed with error -1 rtw89_8852ce 0000:01:00.0: failed to early request firmware: -1 ``` Trace ------ ``` request_partial_firmware_into_buf() > _request_firmware() >> fw_get_filesystem_firmware() >>> kernel_read_file_from_path_initns() >>>> kernel_read_file() >>>>> security_kernel_read_file() // It will iterate enabled LSMs' hooks for kernel_read_file. // With loadpin, it hooks loadpin_read_file. ``` If SECURITY_LOADPIN_ENFORCE is enabled, doing kernel_read_file() on partial files will be denied and return -EPERM (-1). Then, the outer API based on it, e.g. request_partial_firmware_into_buf(), will get the error. In the case, we cannot get the firmware stuffs right, even though there might be no error other than a permission issue on reading a partial file. So we have to request full firmware if SECURITY_LOADPIN_ENFORCE is enabled. It makes us still have a chance to do early firmware work on this kind of platforms. Signed-off-by: Zong-Zhe Yang Signed-off-by: Ping-Ke Shih --- drivers/net/wireless/realtek/rtw89/fw.c | 30 +++++++++++++++++-------- drivers/net/wireless/realtek/rtw89/fw.h | 15 +++++++++++++ 2 files changed, 36 insertions(+), 9 deletions(-) diff --git a/drivers/net/wireless/realtek/rtw89/fw.c b/drivers/net/wireless/realtek/rtw89/fw.c index 7e682709232d7..f5daea0d4f93c 100644 --- a/drivers/net/wireless/realtek/rtw89/fw.c +++ b/drivers/net/wireless/realtek/rtw89/fw.c @@ -277,25 +277,37 @@ void rtw89_early_fw_feature_recognize(struct device *device, const struct rtw89_chip_info *chip, u32 *early_feat_map) { - union { - struct rtw89_mfw_hdr mfw_hdr; - u8 fw_hdr[RTW89_FW_HDR_SIZE]; - } buf = {}; + union rtw89_compat_fw_hdr buf = {}; const struct firmware *firmware; + bool full_req = false; u32 ver_code; int ret; int i; - ret = request_partial_firmware_into_buf(&firmware, chip->fw_name, - device, &buf, sizeof(buf), 0); + /* If SECURITY_LOADPIN_ENFORCE is enabled, reading partial files will + * be denied (-EPERM). Then, we don't get right firmware things as + * expected. So, in this case, we have to request full firmware here. + */ + if (IS_ENABLED(CONFIG_SECURITY_LOADPIN_ENFORCE)) + full_req = true; + + if (full_req) + ret = request_firmware(&firmware, chip->fw_name, device); + else + ret = request_partial_firmware_into_buf(&firmware, chip->fw_name, + device, &buf, sizeof(buf), + 0); + if (ret) { dev_err(device, "failed to early request firmware: %d\n", ret); return; } - ver_code = buf.mfw_hdr.sig != RTW89_MFW_SIG ? - RTW89_FW_HDR_VER_CODE(&buf.fw_hdr) : - RTW89_MFW_HDR_VER_CODE(&buf.mfw_hdr); + if (full_req) + ver_code = rtw89_compat_fw_hdr_ver_code(firmware->data); + else + ver_code = rtw89_compat_fw_hdr_ver_code(&buf); + if (!ver_code) goto out; diff --git a/drivers/net/wireless/realtek/rtw89/fw.h b/drivers/net/wireless/realtek/rtw89/fw.h index 46d57414f24e2..5c4c7de1b4f5d 100644 --- a/drivers/net/wireless/realtek/rtw89/fw.h +++ b/drivers/net/wireless/realtek/rtw89/fw.h @@ -3291,6 +3291,21 @@ struct fwcmd_hdr { __le32 hdr1; }; +union rtw89_compat_fw_hdr { + struct rtw89_mfw_hdr mfw_hdr; + u8 fw_hdr[RTW89_FW_HDR_SIZE]; +}; + +static inline u32 rtw89_compat_fw_hdr_ver_code(const void *fw_buf) +{ + const union rtw89_compat_fw_hdr *compat = (typeof(compat))fw_buf; + + if (compat->mfw_hdr.sig == RTW89_MFW_SIG) + return RTW89_MFW_HDR_VER_CODE(&compat->mfw_hdr); + else + return RTW89_FW_HDR_VER_CODE(&compat->fw_hdr); +} + #define RTW89_H2C_RF_PAGE_SIZE 500 #define RTW89_H2C_RF_PAGE_NUM 3 struct rtw89_fw_h2c_rf_reg_info {