From patchwork Mon Dec 14 19:18:48 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: nramas X-Patchwork-Id: 343623 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=-26.2 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 918B1C2BB48 for ; Mon, 14 Dec 2020 19:26:30 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 396D0224B0 for ; Mon, 14 Dec 2020 19:26:30 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2441003AbgLNTZh (ORCPT ); Mon, 14 Dec 2020 14:25:37 -0500 Received: from linux.microsoft.com ([13.77.154.182]:58122 "EHLO linux.microsoft.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2408896AbgLNTTt (ORCPT ); Mon, 14 Dec 2020 14:19:49 -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 EA49720B7185; Mon, 14 Dec 2020 11:19:07 -0800 (PST) DKIM-Filter: OpenDKIM Filter v2.11.0 linux.microsoft.com EA49720B7185 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux.microsoft.com; s=default; t=1607973548; bh=13oyFSjeebmBVRsX5qnb18X54SDtFubLxPq4ZGVsI8w=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=hCB9lgLh1jdL2MRlI/RAaPjwafQihv0aFHamvmZqwq223axDuTS3j3n/u3uOG6jO6 Rkpwen20NvQWotHMD8yISBOliqfm0W3jV06XA6pzzNh12hdmEbnZo6dhFlo444+OiY 9GYDdbyrvgdQMkPwPR9R13ibaD8W7RFXHbdxwBNU= 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, 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, bhsharma@redhat.com, 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 Subject: [PATCH v11 2/8] powerpc: Move ima buffer functions to drivers/of/kexec.c Date: Mon, 14 Dec 2020 11:18:48 -0800 Message-Id: <20201214191854.9050-3-nramas@linux.microsoft.com> X-Mailer: git-send-email 2.29.2 In-Reply-To: <20201214191854.9050-1-nramas@linux.microsoft.com> References: <20201214191854.9050-1-nramas@linux.microsoft.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: devicetree@vger.kernel.org The functions do_get_kexec_buffer() and get_addr_size_cells(), defined in arch/powerpc/kexec/ima.c, retrieve the address and size of the given property from the device tree blob. These functions do not have architecture specific code, but are currently limited to powerpc. do_get_kexec_buffer() correctly handles a device tree property that is a child node of the root node, but not anything other than the immediate root child nodes. Move architecture independent functions get_ima_kexec_buffer() and get_root_addr_size_cells() to "drivers/of/kexec.c". These functions retrieve the chosen node "linux,ima-kexec-buffer" from the device tree, and return the address and size of the buffer used for carrying forward the IMA measurement log across kexec system call. Co-developed-by: Prakhar Srivastava Signed-off-by: Prakhar Srivastava Signed-off-by: Lakshmi Ramasubramanian --- drivers/of/kexec.c | 68 ++++++++++++++++++++++++++++++++++++++++++++++ include/linux/of.h | 3 ++ 2 files changed, 71 insertions(+) diff --git a/drivers/of/kexec.c b/drivers/of/kexec.c index 66787be081fe..9af5371340b1 100644 --- a/drivers/of/kexec.c +++ b/drivers/of/kexec.c @@ -30,6 +30,10 @@ /** * fdt_find_and_del_mem_rsv - delete memory reservation with given address and size * + * @fdt: Flattened Device Tree to update + * @start: Starting address of the reservation to delete + * @size: Size of the reservation to delete + * * Return: 0 on success, or negative errno on error. */ static int fdt_find_and_del_mem_rsv(void *fdt, unsigned long start, unsigned long size) @@ -226,3 +230,67 @@ int of_kexec_setup_new_fdt(const struct kimage *image, void *fdt, return 0; } + +/** + * get_root_addr_size_cells - Get address and size of root node + * + * @addr_cells: Return address of the root node + * @size_cells: Return size of the root node + * + * Return: 0 on success, or negative errno on error. + */ +int get_root_addr_size_cells(int *addr_cells, int *size_cells) +{ + struct device_node *root; + + root = of_find_node_by_path("/"); + if (!root) + return -EINVAL; + + *addr_cells = of_n_addr_cells(root); + *size_cells = of_n_size_cells(root); + + of_node_put(root); + + return 0; +} + +/** + * get_ima_kexec_buffer - Get address and size of IMA kexec buffer + * + * @fdt: Flattened Device Tree + * @chosen_node: Offset of chosen node in the FDT + * @addr: Return address of the node + * @size: Return size of the node + * + * Return: 0 on success, or negative errno on error. + */ +int get_ima_kexec_buffer(void *fdt, int chosen_node, + unsigned long *addr, size_t *size) +{ + const void *prop; + int addr_cells, size_cells, prop_len; + int rc; + + rc = get_root_addr_size_cells(&addr_cells, &size_cells); + if (rc) + return rc; + + if (fdt) + prop = fdt_getprop(fdt, chosen_node, + "linux,ima-kexec-buffer", &prop_len); + else + prop = of_get_property(of_chosen, + "linux,ima-kexec-buffer", &prop_len); + + if (!prop) + return -ENOENT; + + if (prop_len < 4 * (addr_cells + size_cells)) + return -EINVAL; + + *addr = of_read_number(prop, addr_cells); + *size = of_read_number(prop + 4 * addr_cells, size_cells); + + return 0; +} diff --git a/include/linux/of.h b/include/linux/of.h index 3375f5295875..fb2ef274135d 100644 --- a/include/linux/of.h +++ b/include/linux/of.h @@ -562,6 +562,9 @@ struct kimage; int of_kexec_setup_new_fdt(const struct kimage *image, void *fdt, unsigned long initrd_load_addr, unsigned long initrd_len, const char *cmdline); +int get_root_addr_size_cells(int *addr_cells, int *size_cells); +int get_ima_kexec_buffer(void *fdt, int chosen_node, + unsigned long *addr, size_t *size); #else /* CONFIG_OF */ From patchwork Mon Dec 14 19:18:49 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: nramas X-Patchwork-Id: 343626 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=-26.2 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=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 D1C24C2BB40 for ; Mon, 14 Dec 2020 19:20:19 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 92B17225A9 for ; Mon, 14 Dec 2020 19:20:19 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2408946AbgLNTUC (ORCPT ); Mon, 14 Dec 2020 14:20:02 -0500 Received: from linux.microsoft.com ([13.77.154.182]:58182 "EHLO linux.microsoft.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2408917AbgLNTTu (ORCPT ); Mon, 14 Dec 2020 14:19:50 -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 9C02020B7187; Mon, 14 Dec 2020 11:19:08 -0800 (PST) DKIM-Filter: OpenDKIM Filter v2.11.0 linux.microsoft.com 9C02020B7187 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux.microsoft.com; s=default; t=1607973549; bh=hH4snP6KJu6Jo7DP/DJho2Glu0NJzsjpS7vkhVQL4/w=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=Fk8l0daeh4RAAw/wr7q+F326CBds8RLznKZLiFAnOZ+lTV+UKGx9zObme/uKCPUcE p0ZnmrfMyTQtsE4/vd2dW0dOVBCqAT749w5Jm4Zq4R9FWAtvqjbNd9JM4Z1+VSgQjI 4fmIEXormdxY7UeCcV7weiyBsZIOztvFpSlfPi6s= 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, 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, bhsharma@redhat.com, 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 Subject: [PATCH v11 3/8] powerpc: Use ima kexec node functions Date: Mon, 14 Dec 2020 11:18:49 -0800 Message-Id: <20201214191854.9050-4-nramas@linux.microsoft.com> X-Mailer: git-send-email 2.29.2 In-Reply-To: <20201214191854.9050-1-nramas@linux.microsoft.com> References: <20201214191854.9050-1-nramas@linux.microsoft.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: devicetree@vger.kernel.org do_get_kexec_buffer() and get_addr_size_cells() are called by ima_get_kexec_buffer(), ima_free_kexec_buffer, and remove_ima_buffer() to retrieve the address and size of the buffer used for carrying forward the IMA measurement log across kexec system call. These functions correctly handle a device tree property that is a child node of the root node, but not anything other than the immediate root child nodes. Use the architecture independent functions get_ima_kexec_buffer() and get_root_addr_size_cells() defined in "drivers/of/kexec.c", to get the address and size of the IMA measurement log buffer from the device tree. Remove do_get_kexec_buffer() and get_addr_size_cells() since they are not used anymore. Co-developed-by: Prakhar Srivastava Signed-off-by: Prakhar Srivastava Signed-off-by: Lakshmi Ramasubramanian --- arch/powerpc/kexec/ima.c | 58 +++++----------------------------------- 1 file changed, 7 insertions(+), 51 deletions(-) diff --git a/arch/powerpc/kexec/ima.c b/arch/powerpc/kexec/ima.c index a36c39db4b1a..906e8212435d 100644 --- a/arch/powerpc/kexec/ima.c +++ b/arch/powerpc/kexec/ima.c @@ -13,40 +13,6 @@ #include #include -static int get_addr_size_cells(int *addr_cells, int *size_cells) -{ - struct device_node *root; - - root = of_find_node_by_path("/"); - if (!root) - return -EINVAL; - - *addr_cells = of_n_addr_cells(root); - *size_cells = of_n_size_cells(root); - - of_node_put(root); - - return 0; -} - -static int do_get_kexec_buffer(const void *prop, int len, unsigned long *addr, - size_t *size) -{ - int ret, addr_cells, size_cells; - - ret = get_addr_size_cells(&addr_cells, &size_cells); - if (ret) - return ret; - - if (len < 4 * (addr_cells + size_cells)) - return -ENOENT; - - *addr = of_read_number(prop, addr_cells); - *size = of_read_number(prop + 4 * addr_cells, size_cells); - - return 0; -} - /** * ima_get_kexec_buffer - get IMA buffer from the previous kernel * @addr: On successful return, set to point to the buffer contents. @@ -56,16 +22,11 @@ static int do_get_kexec_buffer(const void *prop, int len, unsigned long *addr, */ int ima_get_kexec_buffer(void **addr, size_t *size) { - int ret, len; + int ret; unsigned long tmp_addr; size_t tmp_size; - const void *prop; - prop = of_get_property(of_chosen, "linux,ima-kexec-buffer", &len); - if (!prop) - return -ENOENT; - - ret = do_get_kexec_buffer(prop, len, &tmp_addr, &tmp_size); + ret = get_ima_kexec_buffer(NULL, 0, &tmp_addr, &tmp_size); if (ret) return ret; @@ -89,7 +50,7 @@ int ima_free_kexec_buffer(void) if (!prop) return -ENOENT; - ret = do_get_kexec_buffer(prop->value, prop->length, &addr, &size); + ret = get_ima_kexec_buffer(NULL, 0, &addr, &size); if (ret) return ret; @@ -98,7 +59,6 @@ int ima_free_kexec_buffer(void) return ret; return memblock_free(addr, size); - } /** @@ -112,19 +72,15 @@ int ima_free_kexec_buffer(void) */ void remove_ima_buffer(void *fdt, int chosen_node) { - int ret, len; + int ret; unsigned long addr; size_t size; - const void *prop; - prop = fdt_getprop(fdt, chosen_node, "linux,ima-kexec-buffer", &len); - if (!prop) + ret = get_ima_kexec_buffer(fdt, chosen_node, &addr, &size); + if (ret) return; - ret = do_get_kexec_buffer(prop, len, &addr, &size); fdt_delprop(fdt, chosen_node, "linux,ima-kexec-buffer"); - if (ret) - return; ret = delete_fdt_mem_rsv(fdt, addr, size); if (!ret) @@ -191,7 +147,7 @@ int setup_ima_buffer(const struct kimage *image, void *fdt, int chosen_node) if (!image->arch.ima_buffer_size) return 0; - ret = get_addr_size_cells(&addr_cells, &size_cells); + ret = get_root_addr_size_cells(&addr_cells, &size_cells); if (ret) return ret; From patchwork Mon Dec 14 19:18:51 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: nramas X-Patchwork-Id: 343625 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=-26.2 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 2D9E8C4361B for ; Mon, 14 Dec 2020 19:23:53 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id D7C55224B0 for ; Mon, 14 Dec 2020 19:23:52 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2501965AbgLNTUp (ORCPT ); Mon, 14 Dec 2020 14:20:45 -0500 Received: from linux.microsoft.com ([13.77.154.182]:58466 "EHLO linux.microsoft.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2440884AbgLNTUg (ORCPT ); Mon, 14 Dec 2020 14:20:36 -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 0560320B718A; Mon, 14 Dec 2020 11:19:10 -0800 (PST) DKIM-Filter: OpenDKIM Filter v2.11.0 linux.microsoft.com 0560320B718A DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux.microsoft.com; s=default; t=1607973550; bh=wRDctihRsmviTPy9E5NQPqpLOD2WoC6cSXwR/EfWCQU=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=jvoE5zUbjq370aqAJLu0S1P/+To2Db1y926vIwGxyX6Vl87UAZeT9Xy5Yq6a+yH2L uWHUAB07L0v4zwni/eSwdZ5cBCaQgaGLy4spB4RzC/RKETGwN+6uW2m0aT9Ywn2FXz uVtMqVNogsV5LDJJkz7MWvgFqYKUbibyo5BeVbvY= 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, 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, bhsharma@redhat.com, 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 Subject: [PATCH v11 5/8] powerpc: Move ima_get_kexec_buffer() and ima_free_kexec_buffer() to ima Date: Mon, 14 Dec 2020 11:18:51 -0800 Message-Id: <20201214191854.9050-6-nramas@linux.microsoft.com> X-Mailer: git-send-email 2.29.2 In-Reply-To: <20201214191854.9050-1-nramas@linux.microsoft.com> References: <20201214191854.9050-1-nramas@linux.microsoft.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: devicetree@vger.kernel.org ima_get_kexec_buffer() retrieves the address and size of the buffer used for carrying forward the IMA measurement logs on kexec from the device tree. ima_free_kexec_buffer() removes the chosen node "linux,ima-kexec-buffer" from the device tree, and frees the buffer used for carrying forward the IMA measurement logs on kexec. These functions do not have architecture specific code, but are currently limited to powerpc. Move ima_get_kexec_buffer() and ima_free_kexec_buffer() to ima_kexec.c in IMA so that they are accessible for other architectures as well. With the above change the functions in arch/powerpc/kexec/ima.c are defined only when the kernel config CONFIG_IMA_KEXEC is enabled. Update the Makefile to build arch/powerpc/kexec/ima.c only when CONFIG_IMA_KEXEC is enabled and remove "#ifdef CONFIG_IMA_KEXEC" in arch/powerpc/kexec/ima.c. Co-developed-by: Prakhar Srivastava Signed-off-by: Prakhar Srivastava Signed-off-by: Lakshmi Ramasubramanian --- arch/powerpc/include/asm/ima.h | 3 -- arch/powerpc/kexec/Makefile | 7 +--- arch/powerpc/kexec/ima.c | 51 ----------------------------- security/integrity/ima/ima_kexec.c | 52 ++++++++++++++++++++++++++++++ 4 files changed, 53 insertions(+), 60 deletions(-) diff --git a/arch/powerpc/include/asm/ima.h b/arch/powerpc/include/asm/ima.h index fbc0c866b6bc..3875c9334d64 100644 --- a/arch/powerpc/include/asm/ima.h +++ b/arch/powerpc/include/asm/ima.h @@ -4,9 +4,6 @@ #include -int ima_get_kexec_buffer(void **addr, size_t *size); -int ima_free_kexec_buffer(void); - #ifdef CONFIG_IMA_KEXEC int arch_ima_add_kexec_buffer(struct kimage *image, unsigned long load_addr, size_t size); diff --git a/arch/powerpc/kexec/Makefile b/arch/powerpc/kexec/Makefile index 4aff6846c772..f54a9dbff4c8 100644 --- a/arch/powerpc/kexec/Makefile +++ b/arch/powerpc/kexec/Makefile @@ -9,12 +9,7 @@ obj-$(CONFIG_PPC32) += relocate_32.o obj-$(CONFIG_KEXEC_FILE) += file_load.o ranges.o file_load_$(BITS).o elf_$(BITS).o -ifdef CONFIG_HAVE_IMA_KEXEC -ifdef CONFIG_IMA -obj-y += ima.o -endif -endif - +obj-$(CONFIG_IMA_KEXEC) += ima.o # Disable GCOV, KCOV & sanitizers in odd or sensitive code GCOV_PROFILE_core_$(BITS).o := n diff --git a/arch/powerpc/kexec/ima.c b/arch/powerpc/kexec/ima.c index 68017123b07d..82730c13a4df 100644 --- a/arch/powerpc/kexec/ima.c +++ b/arch/powerpc/kexec/ima.c @@ -9,59 +9,9 @@ #include #include #include -#include #include #include -/** - * ima_get_kexec_buffer - get IMA buffer from the previous kernel - * @addr: On successful return, set to point to the buffer contents. - * @size: On successful return, set to the buffer size. - * - * Return: 0 on success, negative errno on error. - */ -int ima_get_kexec_buffer(void **addr, size_t *size) -{ - int ret; - unsigned long tmp_addr; - size_t tmp_size; - - ret = get_ima_kexec_buffer(NULL, 0, &tmp_addr, &tmp_size); - if (ret) - return ret; - - *addr = __va(tmp_addr); - *size = tmp_size; - - return 0; -} - -/** - * ima_free_kexec_buffer - free memory used by the IMA buffer - */ -int ima_free_kexec_buffer(void) -{ - int ret; - unsigned long addr; - size_t size; - struct property *prop; - - prop = of_find_property(of_chosen, "linux,ima-kexec-buffer", NULL); - if (!prop) - return -ENOENT; - - ret = get_ima_kexec_buffer(NULL, 0, &addr, &size); - if (ret) - return ret; - - ret = of_remove_property(of_chosen, prop); - if (ret) - return ret; - - return memblock_free(addr, size); -} - -#ifdef CONFIG_IMA_KEXEC /** * arch_ima_add_kexec_buffer - do arch-specific steps to add the IMA buffer * @@ -154,4 +104,3 @@ int setup_ima_buffer(const struct kimage *image, void *fdt, int chosen_node) return 0; } -#endif /* CONFIG_IMA_KEXEC */ diff --git a/security/integrity/ima/ima_kexec.c b/security/integrity/ima/ima_kexec.c index 121de3e04af2..9527118939b8 100644 --- a/security/integrity/ima/ima_kexec.c +++ b/security/integrity/ima/ima_kexec.c @@ -9,7 +9,11 @@ #include #include +#include +#include #include +#include + #include "ima.h" #ifdef CONFIG_IMA_KEXEC @@ -133,6 +137,54 @@ void ima_add_kexec_buffer(struct kimage *image) } #endif /* IMA_KEXEC */ +/** + * ima_get_kexec_buffer - get IMA buffer from the previous kernel + * @addr: On successful return, set to point to the buffer contents. + * @size: On successful return, set to the buffer size. + * + * Return: 0 on success, negative errno on error. + */ +static int ima_get_kexec_buffer(void **addr, size_t *size) +{ + int ret; + unsigned long tmp_addr; + size_t tmp_size; + + ret = get_ima_kexec_buffer(NULL, 0, &tmp_addr, &tmp_size); + if (ret) + return ret; + + *addr = __va(tmp_addr); + *size = tmp_size; + + return 0; +} + +/** + * ima_free_kexec_buffer - free memory used by the IMA buffer + */ +static int ima_free_kexec_buffer(void) +{ + int ret; + unsigned long addr; + size_t size; + struct property *prop; + + prop = of_find_property(of_chosen, "linux,ima-kexec-buffer", NULL); + if (!prop) + return -ENOENT; + + ret = get_ima_kexec_buffer(NULL, 0, &addr, &size); + if (ret) + return ret; + + ret = of_remove_property(of_chosen, prop); + if (ret) + return ret; + + return memblock_free(addr, size); +} + /* * Restore the measurement list from the previous kernel. */ From patchwork Mon Dec 14 19:18:54 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: nramas X-Patchwork-Id: 343624 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=-26.2 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 4C74FC4361B for ; Mon, 14 Dec 2020 19:25:16 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id F2441224B0 for ; Mon, 14 Dec 2020 19:25:15 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2441014AbgLNTYD (ORCPT ); Mon, 14 Dec 2020 14:24:03 -0500 Received: from linux.microsoft.com ([13.77.154.182]:58452 "EHLO linux.microsoft.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2440629AbgLNTUa (ORCPT ); Mon, 14 Dec 2020 14:20:30 -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 09A9520B7194; Mon, 14 Dec 2020 11:19:12 -0800 (PST) DKIM-Filter: OpenDKIM Filter v2.11.0 linux.microsoft.com 09A9520B7194 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux.microsoft.com; s=default; t=1607973552; bh=QkphXWzx5fz1WuzpPcHwgIcg3+cf9Tl76X22FiGdJLM=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=HFN1aRobory2qztTVo5zA69tHeZH8OzyDVaoijxqttpQv+req1IdIkjqo1YjR+wLV yi5jpKAV0UoMVYzBHSSVt7CQX18is1+P7DF3oMVrNFAV8KSl90eDdJWKWHBnwD870P ntHdzk6rW99/4eUZqa/u0dpAdQh6Ov/GViq4cFQc= 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, 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, bhsharma@redhat.com, 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 Subject: [PATCH v11 8/8] arm64: Add IMA log information in kimage used for kexec Date: Mon, 14 Dec 2020 11:18:54 -0800 Message-Id: <20201214191854.9050-9-nramas@linux.microsoft.com> X-Mailer: git-send-email 2.29.2 In-Reply-To: <20201214191854.9050-1-nramas@linux.microsoft.com> References: <20201214191854.9050-1-nramas@linux.microsoft.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: devicetree@vger.kernel.org Address and size of the buffer containing the IMA measurement log need to be passed from the current kernel to the next kernel on kexec. Any existing "linux,ima-kexec-buffer" property in the device tree needs to be removed and its corresponding memory reservation in the currently running kernel needs to be freed. The address and size of the current kernel's IMA measurement log need to be added to the device tree's IMA kexec buffer node and memory for the buffer needs to be reserved for the log to be carried over to the next kernel on the kexec call. Add address and size fields to "struct kimage_arch" for ARM64 platform to hold the address and size of the IMA measurement log buffer. Remove any existing "linux,ima-kexec-buffer" property in the device tree and free the corresponding memory reservation in the currently running kernel. Add "linux,ima-kexec-buffer" property to the device tree and reserve the memory for storing the IMA log that needs to be passed from the current kernel to the next one. Update CONFIG_KEXEC_FILE to select CONFIG_HAVE_IMA_KEXEC to indicate that the IMA measurement log information is present in the device tree for ARM64. Co-developed-by: Prakhar Srivastava Signed-off-by: Prakhar Srivastava Signed-off-by: Lakshmi Ramasubramanian --- arch/arm64/Kconfig | 1 + arch/arm64/include/asm/ima.h | 24 +++++++++++++ arch/arm64/include/asm/kexec.h | 5 +++ arch/arm64/kernel/Makefile | 1 + arch/arm64/kernel/ima.c | 49 ++++++++++++++++++++++++++ arch/arm64/kernel/machine_kexec_file.c | 8 +++++ 6 files changed, 88 insertions(+) create mode 100644 arch/arm64/include/asm/ima.h create mode 100644 arch/arm64/kernel/ima.c diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig index 1d466addb078..c85d18b1f2fd 100644 --- a/arch/arm64/Kconfig +++ b/arch/arm64/Kconfig @@ -1094,6 +1094,7 @@ config KEXEC config KEXEC_FILE bool "kexec file based system call" select KEXEC_CORE + select HAVE_IMA_KEXEC help This is new version of kexec system call. This system call is file based and takes file descriptors as system call argument diff --git a/arch/arm64/include/asm/ima.h b/arch/arm64/include/asm/ima.h new file mode 100644 index 000000000000..8b105157e55f --- /dev/null +++ b/arch/arm64/include/asm/ima.h @@ -0,0 +1,24 @@ +/* SPDX-License-Identifier: GPL-2.0-or-later */ +/* + * Copyright (C) 2020 Microsoft Corporation + * + * Author: Lakshmi Ramasubramanian + * + */ +#ifndef _ASM_ARCH_IMA_H +#define _ASM_ARCH_IMA_H + +#include + +#ifdef CONFIG_IMA_KEXEC +int setup_ima_buffer(const struct kimage *image, void *dtb, int off); +#else +static inline int setup_ima_buffer(const struct kimage *image, void *dtb, + int off) +{ + remove_ima_buffer(dtb, off); + return 0; +} +#endif /* CONFIG_IMA_KEXEC */ + +#endif /* _ASM_ARCH_IMA_H */ diff --git a/arch/arm64/include/asm/kexec.h b/arch/arm64/include/asm/kexec.h index d24b527e8c00..2bd19ccb6c43 100644 --- a/arch/arm64/include/asm/kexec.h +++ b/arch/arm64/include/asm/kexec.h @@ -100,6 +100,11 @@ struct kimage_arch { void *elf_headers; unsigned long elf_headers_mem; unsigned long elf_headers_sz; + +#ifdef CONFIG_IMA_KEXEC + phys_addr_t ima_buffer_addr; + size_t ima_buffer_size; +#endif }; extern const struct kexec_file_ops kexec_image_ops; diff --git a/arch/arm64/kernel/Makefile b/arch/arm64/kernel/Makefile index bbaf0bc4ad60..da83f1b3367e 100644 --- a/arch/arm64/kernel/Makefile +++ b/arch/arm64/kernel/Makefile @@ -60,6 +60,7 @@ obj-$(CONFIG_ARM_SDE_INTERFACE) += sdei.o obj-$(CONFIG_ARM64_PTR_AUTH) += pointer_auth.o obj-$(CONFIG_SHADOW_CALL_STACK) += scs.o obj-$(CONFIG_ARM64_MTE) += mte.o +obj-$(CONFIG_IMA_KEXEC) += ima.o obj-y += vdso/ probes/ obj-$(CONFIG_COMPAT_VDSO) += vdso32/ diff --git a/arch/arm64/kernel/ima.c b/arch/arm64/kernel/ima.c new file mode 100644 index 000000000000..fa7a1dbae183 --- /dev/null +++ b/arch/arm64/kernel/ima.c @@ -0,0 +1,49 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * Copyright (C) 2020 Microsoft Corporation + * + * Author: Lakshmi Ramasubramanian + * + */ + +#include +#include +#include +#include + +/** + * setup_ima_buffer - add IMA buffer information to the fdt + * + * @image: kexec image being loaded. + * @dtb: Flattened device tree for the next kernel. + * @off: Offset to the chosen node. + * + * Return: 0 on success, or negative errno on error. + */ +int setup_ima_buffer(const struct kimage *image, void *dtb, int off) +{ + int ret = 0; + + remove_ima_buffer(dtb, off); + + /* add ima-kexec-buffer */ + if (image->arch.ima_buffer_size > 0) { + ret = fdt_appendprop_addrrange(dtb, 0, off, + "linux,ima-kexec-buffer", + image->arch.ima_buffer_addr, + image->arch.ima_buffer_size); + if (ret) { + ret = (ret == -FDT_ERR_NOSPACE ? -ENOMEM : -EINVAL); + goto out; + } + + ret = fdt_add_mem_rsv(dtb, image->arch.ima_buffer_addr, + image->arch.ima_buffer_size); + } + +out: + if (ret) + pr_err("Error setting up ima buffer in device tree.\n"); + + return ret; +} diff --git a/arch/arm64/kernel/machine_kexec_file.c b/arch/arm64/kernel/machine_kexec_file.c index 3e045cd62451..37a528aca780 100644 --- a/arch/arm64/kernel/machine_kexec_file.c +++ b/arch/arm64/kernel/machine_kexec_file.c @@ -21,6 +21,7 @@ #include #include #include +#include const struct kexec_file_ops * const kexec_file_loaders[] = { &kexec_image_ops, @@ -83,6 +84,13 @@ static int create_dtb(struct kimage *image, } } + ret = setup_ima_buffer(image, buf, + fdt_path_offset(buf, "/chosen")); + if (ret) { + vfree(buf); + return ret; + } + /* trim it */ fdt_pack(buf); *dtb = buf;