From patchwork Tue Jun 9 22:56:56 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Scott Branden X-Patchwork-Id: 208411 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=-9.8 required=3.0 tests=DKIMWL_WL_HIGH, DKIM_SIGNED, DKIM_VALID, DKIM_VALID_AU, HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH, MAILING_LIST_MULTI, SIGNED_OFF_BY, SPF_HELO_NONE, 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 E7809C433DF for ; Tue, 9 Jun 2020 22:58:21 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id C2A52206D5 for ; Tue, 9 Jun 2020 22:58:21 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=broadcom.com header.i=@broadcom.com header.b="ByJPGZ0f" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728193AbgFIW6U (ORCPT ); Tue, 9 Jun 2020 18:58:20 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:60790 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728645AbgFIW5q (ORCPT ); Tue, 9 Jun 2020 18:57:46 -0400 Received: from mail-pg1-x542.google.com (mail-pg1-x542.google.com [IPv6:2607:f8b0:4864:20::542]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 351F2C008745 for ; Tue, 9 Jun 2020 15:57:36 -0700 (PDT) Received: by mail-pg1-x542.google.com with SMTP id e18so79026pgn.7 for ; Tue, 09 Jun 2020 15:57:36 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=broadcom.com; s=google; h=from:to:cc:subject:date:message-id:in-reply-to:references; bh=cM+rCpZobNDrkDN9s+cJ/Q1XgGFeWXzm3UzYtFYpyy4=; b=ByJPGZ0fwC+pHYx4+jr86EPnUJT03kDN80FFAKD7I5rX+wsF2f7csCPEgbu0Vv5JXD ZyLWQTOAA/02+ZV08uuMrd6LxZHpZq8t+zpNoZQcJEL4vViRm5Z4Qrylf4XzyxMH9i+e 6RPwx+6tj/r3KDMiIgbqsv1cvcx5htVk6ttBo= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references; bh=cM+rCpZobNDrkDN9s+cJ/Q1XgGFeWXzm3UzYtFYpyy4=; b=DR9OJQo7M8pHaL62dckJ3CIw2X4Jtdb3zicCyxOcnJ+1BNjDX3BLm8hLTj7Z073kJX NWNJXEeQ6AoenOui5QdCBIJPJmU7vyKjdTf3gd2aiNYtryMgzU+ys7Glu0iB9S7gDVeX W27jzM5VWWWHVeqLeS7WMXQ0cpBJbgSKLS3vOZD3GTQacn8QnYzglaHl2mguHjV5bAZB IqzVW7o8Vkwbb5iwH60XEaTuNCzAFhGJMFy2KDkTd8ZP78gqBEdNn6P5Ml8VPvJYyMku LrIC0PunmeVc0HjdAfW86Cr1s927pzUPIU5iVB+YiO0mk5Zsr+DHOLurmBHmD4u3GTvQ //hQ== X-Gm-Message-State: AOAM533cjAW0bqBTOA71HKaqSuUaL580kaQPUzOObiy5W0nYCtOhyRNZ 5o0cdaA1A5JoAUtCz4VE7O1TTw== X-Google-Smtp-Source: ABdhPJzt2on8TT/VRipqTfFNR4O9ShRqcpSzbecmhCO8fd5EePg4uWMnzAa84LqTYB4Rh0Gh65kwjA== X-Received: by 2002:a63:145f:: with SMTP id 31mr212923pgu.383.1591743455670; Tue, 09 Jun 2020 15:57:35 -0700 (PDT) Received: from lbrmn-lnxub113.broadcom.net ([192.19.228.250]) by smtp.gmail.com with ESMTPSA id p8sm9104978pgs.29.2020.06.09.15.57.32 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 09 Jun 2020 15:57:34 -0700 (PDT) From: Scott Branden To: Luis Chamberlain , Wolfram Sang , Greg Kroah-Hartman , David Brown , Alexander Viro , Shuah Khan , bjorn.andersson@linaro.org, Shuah Khan , Arnd Bergmann Cc: Mimi Zohar , "Rafael J . Wysocki" , linux-kernel@vger.kernel.org, linux-arm-msm@vger.kernel.org, linux-fsdevel@vger.kernel.org, BCM Kernel Feedback , Olof Johansson , Andrew Morton , Dan Carpenter , Colin Ian King , Kees Cook , Takashi Iwai , linux-kselftest@vger.kernel.org, Andy Gross , linux-integrity@vger.kernel.org, linux-security-module@vger.kernel.org, Scott Branden Subject: [PATCH v8 8/8] ima: add FIRMWARE_PARTIAL_READ support Date: Tue, 9 Jun 2020 15:56:56 -0700 Message-Id: <20200609225656.18663-9-scott.branden@broadcom.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20200609225656.18663-1-scott.branden@broadcom.com> References: <20200609225656.18663-1-scott.branden@broadcom.com> Sender: linux-kselftest-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kselftest@vger.kernel.org Add FIRMWARE_PARTIAL_READ support for integrity measurement on partial reads of firmware files. Signed-off-by: Scott Branden --- security/integrity/ima/ima_main.c | 24 +++++++++++++++++++++++- 1 file changed, 23 insertions(+), 1 deletion(-) diff --git a/security/integrity/ima/ima_main.c b/security/integrity/ima/ima_main.c index 800fb3bba418..fc5134807acf 100644 --- a/security/integrity/ima/ima_main.c +++ b/security/integrity/ima/ima_main.c @@ -609,6 +609,9 @@ void ima_post_path_mknod(struct dentry *dentry) */ int ima_read_file(struct file *file, enum kernel_read_file_id read_id) { + enum ima_hooks func; + u32 secid; + /* * READING_FIRMWARE_PREALLOC_BUFFER * @@ -617,11 +620,27 @@ int ima_read_file(struct file *file, enum kernel_read_file_id read_id) * of IMA's signature verification any more than when using two * buffers? */ - return 0; + if (read_id != READING_FIRMWARE_PARTIAL_READ) + return 0; + + if (!file) { + if ((ima_appraise & IMA_APPRAISE_FIRMWARE) && + (ima_appraise & IMA_APPRAISE_ENFORCE)) { + pr_err("Prevent firmware loading_store.\n"); + return -EACCES; /* INTEGRITY_UNKNOWN */ + } + return 0; + } + + func = read_idmap[read_id] ?: FILE_CHECK; + security_task_getsecid(current, &secid); + return process_measurement(file, current_cred(), secid, NULL, + 0, MAY_READ, func); } const int read_idmap[READING_MAX_ID] = { [READING_FIRMWARE] = FIRMWARE_CHECK, + [READING_FIRMWARE_PARTIAL_READ] = FIRMWARE_CHECK, [READING_FIRMWARE_PREALLOC_BUFFER] = FIRMWARE_CHECK, [READING_MODULE] = MODULE_CHECK, [READING_KEXEC_IMAGE] = KEXEC_KERNEL_CHECK, @@ -648,6 +667,9 @@ int ima_post_read_file(struct file *file, void *buf, loff_t size, enum ima_hooks func; u32 secid; + if (read_id == READING_FIRMWARE_PARTIAL_READ) + return 0; + if (!file && read_id == READING_FIRMWARE) { if ((ima_appraise & IMA_APPRAISE_FIRMWARE) && (ima_appraise & IMA_APPRAISE_ENFORCE)) {