From patchwork Fri Oct 21 02:44:53 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Thiago Jung Bauermann X-Patchwork-Id: 9387889 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id 24B9160487 for ; Fri, 21 Oct 2016 02:46:08 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 1376C29D4A for ; Fri, 21 Oct 2016 02:46:08 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 07E4B29D51; Fri, 21 Oct 2016 02:46:08 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-6.9 required=2.0 tests=BAYES_00,RCVD_IN_DNSWL_HI autolearn=ham version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id E046729D4A for ; Fri, 21 Oct 2016 02:46:06 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754978AbcJUCpy (ORCPT ); Thu, 20 Oct 2016 22:45:54 -0400 Received: from mx0a-001b2d01.pphosted.com ([148.163.156.1]:51142 "EHLO mx0a-001b2d01.pphosted.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754954AbcJUCpx (ORCPT ); Thu, 20 Oct 2016 22:45:53 -0400 Received: from pps.filterd (m0098409.ppops.net [127.0.0.1]) by mx0a-001b2d01.pphosted.com (8.16.0.17/8.16.0.17) with SMTP id u9L2hsvJ002388 for ; Thu, 20 Oct 2016 22:45:52 -0400 Received: from e24smtp02.br.ibm.com (e24smtp02.br.ibm.com [32.104.18.86]) by mx0a-001b2d01.pphosted.com with ESMTP id 2675yh0vh2-1 (version=TLSv1.2 cipher=AES256-SHA bits=256 verify=NOT) for ; Thu, 20 Oct 2016 22:45:51 -0400 Received: from localhost by e24smtp02.br.ibm.com with IBM ESMTP SMTP Gateway: Authorized Use Only! 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Violators will be prosecuted; Fri, 21 Oct 2016 00:45:46 -0200 Received: from d24relay02.br.ibm.com (d24relay02.br.ibm.com [9.13.184.26]) by d24dlp01.br.ibm.com (Postfix) with ESMTP id 0A444352005F; Thu, 20 Oct 2016 22:45:19 -0400 (EDT) Received: from d24av05.br.ibm.com (d24av05.br.ibm.com [9.18.232.44]) by d24relay02.br.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id u9L2jjvu29360606; Fri, 21 Oct 2016 00:45:45 -0200 Received: from d24av05.br.ibm.com (localhost [127.0.0.1]) by d24av05.br.ibm.com (8.14.4/8.14.4/NCO v10.0 AVout) with ESMTP id u9L2jidh004858; Fri, 21 Oct 2016 00:45:45 -0200 Received: from morokweng.ibm.com ([9.85.156.190]) by d24av05.br.ibm.com (8.14.4/8.14.4/NCO v10.0 AVin) with ESMTP id u9L2j1Re003697; Fri, 21 Oct 2016 00:45:36 -0200 From: Thiago Jung Bauermann To: linux-security-module Cc: Mimi Zohar , "Eric W. Biederman" , linux-ima-devel@lists.sourceforge.net, Dave Young , kexec@lists.infradead.org, linuxppc-dev@lists.ozlabs.org, linux-kernel@vger.kernel.org, Andrew Morton , Thiago Jung Bauermann Subject: [PATCH v6 05/10] powerpc: ima: Send the kexec buffer to the next kernel Date: Fri, 21 Oct 2016 00:44:53 -0200 X-Mailer: git-send-email 2.7.4 In-Reply-To: <1477017898-10375-1-git-send-email-bauerman@linux.vnet.ibm.com> References: <1477017898-10375-1-git-send-email-bauerman@linux.vnet.ibm.com> X-TM-AS-MML: disable X-Content-Scanned: Fidelis XPS MAILER x-cbid: 16102102-0020-0000-0000-00000254426F X-IBM-AV-DETECTION: SAVI=unused REMOTE=unused XFE=unused x-cbparentid: 16102102-0021-0000-0000-0000305D908A Message-Id: <1477017898-10375-6-git-send-email-bauerman@linux.vnet.ibm.com> X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10432:, , definitions=2016-10-21_01:, , signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 spamscore=0 suspectscore=2 malwarescore=0 phishscore=0 adultscore=0 bulkscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1609300000 definitions=main-1610210048 Sender: owner-linux-security-module@vger.kernel.org Precedence: bulk List-ID: X-Virus-Scanned: ClamAV using ClamSMTP The IMA kexec buffer allows the currently running kernel to pass the measurement list via a kexec segment to the kernel that will be kexec'd. This is the architecture-specific part of setting up the IMA kexec buffer for the next kernel. It will be used in the next patch. Changelog v5: - New patch in this version. This code was previously in the kexec buffer handover patch series. Changelog relative to kexec handover patches v5: - Moved code to arch/powerpc/kernel/ima_kexec.c. - Renamed functions and struct members to variations of ima_kexec_buffer instead of variations of kexec_handover_buffer. - Use a single property /chosen/linux,ima-kexec-buffer containing the buffer address and length, instead of /chosen/linux,kexec-handover-buffer-{start,end}. - Use #address-cells and #size-cells to write the DT property. - Use size_t instead of unsigned long for size arguments. - Use CONFIG_IMA_KEXEC to build this code only when necessary. Signed-off-by: Thiago Jung Bauermann Acked-by: "Eric W. Biederman" --- arch/powerpc/include/asm/ima.h | 16 +++++ arch/powerpc/include/asm/kexec.h | 14 ++++- arch/powerpc/kernel/ima_kexec.c | 91 +++++++++++++++++++++++++++++ arch/powerpc/kernel/kexec_elf_64.c | 2 +- arch/powerpc/kernel/machine_kexec_file_64.c | 12 +++- 5 files changed, 129 insertions(+), 6 deletions(-) diff --git a/arch/powerpc/include/asm/ima.h b/arch/powerpc/include/asm/ima.h index d5a72dd9b499..2313bdface34 100644 --- a/arch/powerpc/include/asm/ima.h +++ b/arch/powerpc/include/asm/ima.h @@ -1,6 +1,8 @@ #ifndef _ASM_POWERPC_IMA_H #define _ASM_POWERPC_IMA_H +struct kimage; + int ima_get_kexec_buffer(void **addr, size_t *size); int ima_free_kexec_buffer(void); @@ -10,4 +12,18 @@ void remove_ima_buffer(void *fdt, int chosen_node); static inline void remove_ima_buffer(void *fdt, int chosen_node) {} #endif +#ifdef CONFIG_IMA_KEXEC +int arch_ima_add_kexec_buffer(struct kimage *image, unsigned long load_addr, + size_t size); + +int setup_ima_buffer(const struct kimage *image, void *fdt, int chosen_node); +#else +static inline int setup_ima_buffer(const struct kimage *image, void *fdt, + int chosen_node) +{ + remove_ima_buffer(fdt, chosen_node); + return 0; +} +#endif /* CONFIG_IMA_KEXEC */ + #endif /* _ASM_POWERPC_IMA_H */ diff --git a/arch/powerpc/include/asm/kexec.h b/arch/powerpc/include/asm/kexec.h index 23056d2dc330..a49cab287acb 100644 --- a/arch/powerpc/include/asm/kexec.h +++ b/arch/powerpc/include/asm/kexec.h @@ -94,12 +94,22 @@ static inline bool kdump_in_progress(void) #ifdef CONFIG_KEXEC_FILE extern struct kexec_file_ops kexec_elf64_ops; +#ifdef CONFIG_IMA_KEXEC +#define ARCH_HAS_KIMAGE_ARCH + +struct kimage_arch { + phys_addr_t ima_buffer_addr; + size_t ima_buffer_size; +}; +#endif + int setup_purgatory(struct kimage *image, const void *slave_code, const void *fdt, unsigned long kernel_load_addr, unsigned long fdt_load_addr, unsigned long stack_top, int debug); -int setup_new_fdt(void *fdt, unsigned long initrd_load_addr, - unsigned long initrd_len, const char *cmdline); +int setup_new_fdt(const struct kimage *image, void *fdt, + unsigned long initrd_load_addr, unsigned long initrd_len, + const char *cmdline); bool find_debug_console(const void *fdt); int delete_fdt_mem_rsv(void *fdt, unsigned long start, unsigned long size); #endif /* CONFIG_KEXEC_FILE */ diff --git a/arch/powerpc/kernel/ima_kexec.c b/arch/powerpc/kernel/ima_kexec.c index 36e5a5df3804..5ea42c937ca9 100644 --- a/arch/powerpc/kernel/ima_kexec.c +++ b/arch/powerpc/kernel/ima_kexec.c @@ -130,3 +130,94 @@ void remove_ima_buffer(void *fdt, int chosen_node) if (!ret) pr_debug("Removed old IMA buffer reservation.\n"); } + +#ifdef CONFIG_IMA_KEXEC +/** + * arch_ima_add_kexec_buffer - do arch-specific steps to add the IMA buffer + * + * Architectures should use this function to pass on the IMA buffer + * information to the next kernel. + * + * Return: 0 on success, negative errno on error. + */ +int arch_ima_add_kexec_buffer(struct kimage *image, unsigned long load_addr, + size_t size) +{ + image->arch.ima_buffer_addr = load_addr; + image->arch.ima_buffer_size = size; + + return 0; +} + +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. + * @fdt: Flattened device tree for the next kernel. + * @chosen_node: Offset to the chosen node. + * + * Return: 0 on success, or negative errno on error. + */ +int setup_ima_buffer(const struct kimage *image, void *fdt, int chosen_node) +{ + int ret, addr_cells, size_cells, entry_size; + u8 value[16]; + + remove_ima_buffer(fdt, chosen_node); + if (!image->arch.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->arch.ima_buffer_addr, addr_cells); + if (ret) + return ret; + + ret = write_number(value + 4 * addr_cells, image->arch.ima_buffer_size, + size_cells); + if (ret) + return ret; + + ret = fdt_setprop(fdt, chosen_node, "linux,ima-kexec-buffer", value, + entry_size); + if (ret < 0) + return -EINVAL; + + ret = fdt_add_mem_rsv(fdt, image->arch.ima_buffer_addr, + image->arch.ima_buffer_size); + if (ret) + return -EINVAL; + + pr_debug("IMA buffer at 0x%llx, size = 0x%zx\n", + image->arch.ima_buffer_addr, image->arch.ima_buffer_size); + + return 0; +} +#endif /* CONFIG_IMA_KEXEC */ diff --git a/arch/powerpc/kernel/kexec_elf_64.c b/arch/powerpc/kernel/kexec_elf_64.c index dc29e0131b76..1bd1e9865835 100644 --- a/arch/powerpc/kernel/kexec_elf_64.c +++ b/arch/powerpc/kernel/kexec_elf_64.c @@ -206,7 +206,7 @@ static void *elf64_load(struct kimage *image, char *kernel_buf, goto out; } - ret = setup_new_fdt(fdt, initrd_load_addr, initrd_len, cmdline); + ret = setup_new_fdt(image, fdt, initrd_load_addr, initrd_len, cmdline); if (ret) goto out; diff --git a/arch/powerpc/kernel/machine_kexec_file_64.c b/arch/powerpc/kernel/machine_kexec_file_64.c index 7b13634f71bf..e4da26dabbaf 100644 --- a/arch/powerpc/kernel/machine_kexec_file_64.c +++ b/arch/powerpc/kernel/machine_kexec_file_64.c @@ -393,6 +393,7 @@ int delete_fdt_mem_rsv(void *fdt, unsigned long start, unsigned long size) /* * setup_new_fdt - modify /chosen and memory reservation for the next kernel + * @image: kexec image being loaded. * @fdt: Flattened device tree for the next kernel. * @initrd_load_addr: Address where the next initrd will be loaded. * @initrd_len: Size of the next initrd, or 0 if there will be none. @@ -401,8 +402,9 @@ int delete_fdt_mem_rsv(void *fdt, unsigned long start, unsigned long size) * * Return: 0 on success, or negative errno on error. */ -int setup_new_fdt(void *fdt, unsigned long initrd_load_addr, - unsigned long initrd_len, const char *cmdline) +int setup_new_fdt(const struct kimage *image, void *fdt, + unsigned long initrd_load_addr, unsigned long initrd_len, + const char *cmdline) { int ret, chosen_node; const void *prop; @@ -512,7 +514,11 @@ int setup_new_fdt(void *fdt, unsigned long initrd_load_addr, } } - remove_ima_buffer(fdt, chosen_node); + ret = setup_ima_buffer(image, fdt, chosen_node); + if (ret) { + pr_err("Error setting up the new device tree.\n"); + return ret; + } ret = fdt_setprop(fdt, chosen_node, "linux,booted-from-kexec", NULL, 0); if (ret) {