From patchwork Tue Feb 9 18:21:58 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Lakshmi Ramasubramanian X-Patchwork-Id: 12078851 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=-26.3 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER, INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT, USER_IN_DEF_DKIM_WL autolearn=unavailable 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 DE4E4C433DB for ; Tue, 9 Feb 2021 18:42:03 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 93B0464E7C for ; Tue, 9 Feb 2021 18:42:03 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233570AbhBISlW (ORCPT ); Tue, 9 Feb 2021 13:41:22 -0500 Received: from linux.microsoft.com ([13.77.154.182]:58428 "EHLO linux.microsoft.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233421AbhBIS2F (ORCPT ); Tue, 9 Feb 2021 13:28:05 -0500 Received: from localhost.localdomain (c-73-42-176-67.hsd1.wa.comcast.net [73.42.176.67]) by linux.microsoft.com (Postfix) with ESMTPSA id 4D95C20B57A6; Tue, 9 Feb 2021 10:22:34 -0800 (PST) DKIM-Filter: OpenDKIM Filter v2.11.0 linux.microsoft.com 4D95C20B57A6 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux.microsoft.com; s=default; t=1612894954; bh=JLtKdep8ljX0R5HJlVcxKOGy6sWLOe65FEwvEma/Tow=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=PBD7RXYsF8q0LZAzmADiN7/ouC8eUXPAzLUM05ZQ6i1VYiQNuC+r/YCxt1nKOk1f5 rCeNY0xD+383Qk5t1gRfsIBsy5bPSbaGG9xtfejxVbWqX37Fvgu7la2cpXm0SZaEJN 1DZIiFMdApEwIY0nvoaKKjQmCCCFHAks4YQngC+k= From: Lakshmi Ramasubramanian To: zohar@linux.ibm.com, bauerman@linux.ibm.com, robh@kernel.org, takahiro.akashi@linaro.org, gregkh@linuxfoundation.org, will@kernel.org, joe@perches.com, catalin.marinas@arm.com, mpe@ellerman.id.au Cc: james.morse@arm.com, sashal@kernel.org, benh@kernel.crashing.org, paulus@samba.org, frowand.list@gmail.com, vincenzo.frascino@arm.com, mark.rutland@arm.com, dmitry.kasatkin@gmail.com, jmorris@namei.org, serge@hallyn.com, pasha.tatashin@soleen.com, allison@lohutok.net, masahiroy@kernel.org, mbrugger@suse.com, hsinyi@chromium.org, tao.li@vivo.com, christophe.leroy@c-s.fr, prsriva@linux.microsoft.com, balajib@linux.microsoft.com, linux-integrity@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, devicetree@vger.kernel.org, linuxppc-dev@lists.ozlabs.org Subject: [PATCH v17 08/10] kexec: Use fdt_appendprop_addrrange() to add ima buffer to FDT Date: Tue, 9 Feb 2021 10:21:58 -0800 Message-Id: <20210209182200.30606-9-nramas@linux.microsoft.com> X-Mailer: git-send-email 2.30.0 In-Reply-To: <20210209182200.30606-1-nramas@linux.microsoft.com> References: <20210209182200.30606-1-nramas@linux.microsoft.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-integrity@vger.kernel.org fdt_appendprop_addrrange() function adds a property, with the given name, to the device tree at the given node offset, and also sets the address and size of the property. This function should be used to add "linux,ima-kexec-buffer" property to the device tree and set the address and size of the IMA measurement buffer, instead of using custom function. Use fdt_appendprop_addrrange() to add "linux,ima-kexec-buffer" property to the device tree. This property holds the address and size of the IMA measurement buffer that needs to be passed from the current kernel to the next kernel across kexec system call. Remove custom code that is used in setup_ima_buffer() to add "linux,ima-kexec-buffer" property to the device tree. Co-developed-by: Prakhar Srivastava Signed-off-by: Prakhar Srivastava Signed-off-by: Lakshmi Ramasubramanian Reviewed-by: Thiago Jung Bauermann --- drivers/of/kexec.c | 57 ++++------------------------------------------ 1 file changed, 5 insertions(+), 52 deletions(-) diff --git a/drivers/of/kexec.c b/drivers/of/kexec.c index c601b5af4a88..c53746b9b168 100644 --- a/drivers/of/kexec.c +++ b/drivers/of/kexec.c @@ -232,36 +232,6 @@ int of_ima_add_kexec_buffer(struct kimage *image, return 0; } -/** - * write_number - Convert number to big-endian format - * - * @p: Buffer to write the number to - * @value: Number to convert - * @cells: Number of cells - * - * Return: 0 on success, or negative errno on error. - */ -static int write_number(void *p, u64 value, int cells) -{ - if (cells == 1) { - u32 tmp; - - if (value > U32_MAX) - return -EINVAL; - - tmp = cpu_to_be32(value); - memcpy(p, &tmp, sizeof(tmp)); - } else if (cells == 2) { - u64 tmp; - - tmp = cpu_to_be64(value); - memcpy(p, &tmp, sizeof(tmp)); - } else - return -EINVAL; - - return 0; -} - /** * setup_ima_buffer - add IMA buffer information to the fdt * @image: kexec image being loaded. @@ -273,32 +243,15 @@ static int write_number(void *p, u64 value, int cells) static int setup_ima_buffer(const struct kimage *image, void *fdt, int chosen_node) { - int ret, addr_cells, size_cells, entry_size; - u8 value[16]; + int ret; if (!image->ima_buffer_size) return 0; - ret = get_addr_size_cells(&addr_cells, &size_cells); - if (ret) - return ret; - - entry_size = 4 * (addr_cells + size_cells); - - if (entry_size > sizeof(value)) - return -EINVAL; - - ret = write_number(value, image->ima_buffer_addr, addr_cells); - if (ret) - return ret; - - ret = write_number(value + 4 * addr_cells, image->ima_buffer_size, - size_cells); - if (ret) - return ret; - - ret = fdt_setprop(fdt, chosen_node, "linux,ima-kexec-buffer", value, - entry_size); + ret = fdt_appendprop_addrrange(fdt, 0, chosen_node, + "linux,ima-kexec-buffer", + image->ima_buffer_addr, + image->ima_buffer_size); if (ret < 0) return -EINVAL;