From mboxrd@z Thu Jan 1 00:00:00 1970 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 4C944CCA47F for ; Mon, 27 Jun 2022 12:03:21 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S240092AbiF0MCk (ORCPT ); Mon, 27 Jun 2022 08:02:40 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:34148 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S239937AbiF0L6c (ORCPT ); Mon, 27 Jun 2022 07:58:32 -0400 Received: from galois.linutronix.de (Galois.linutronix.de [193.142.43.55]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id C7720D70; Mon, 27 Jun 2022 04:56:49 -0700 (PDT) Date: Mon, 27 Jun 2022 11:56:46 -0000 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020; t=1656331007; h=from:from:sender:sender:reply-to:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=L2XgszQKvEbaLdcqls7lV8ulDwLB55pFeXxpt610mQk=; b=h6/Qua7LTjWFlDChFsG/Xk9DxssagixgCxTT/lP4+CWhJl6V58iL/47+NbD0emi/8omOez s9GUu+z/ZPm74TmzEnYsRmE/yYE348U3Ki4TC0lC49f/i393/3PlaJ6hMwV3w9mcjVZZ28 GvQTpeWx0oSRUFD8fN3hUGFkKoMe79KdeFlXqPsbLJ/MoGW/2Q5HTNPsLCH3TAUpbFLKb+ ZNg3+yfqCh+0/M3KcOcZYWylxHBxjjlb4NWFgtlOzJw0NtRIeApEVaLPqK+YdA3C5/4gm/ +pm7HGi/5mHIklFnAydw62r/gw2N6P9KgYU2ss/ybALswDocIfeMjgJy5bCAZA== DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020e; t=1656331007; h=from:from:sender:sender:reply-to:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=L2XgszQKvEbaLdcqls7lV8ulDwLB55pFeXxpt610mQk=; b=ZrIIVsuWpY9uUvHvuFqVOkGavC/YOVQfhwX2Yzh4Oo3sbz9gtX/04PrT8b8IG/ouuQ9xmA WM1bJVSWzLOi5JCQ== From: "tip-bot2 for Jonathan McDowell" Sender: tip-bot2@linutronix.de Reply-to: linux-kernel@vger.kernel.org To: linux-tip-commits@vger.kernel.org Subject: [tip: x86/kdump] x86/kexec: Carry forward IMA measurement log on kexec Cc: Jonathan McDowell , Borislav Petkov , Mimi Zohar , Baoquan He , x86@kernel.org, linux-kernel@vger.kernel.org In-Reply-To: References: MIME-Version: 1.0 Message-ID: <165633100606.4207.1855356270638972270.tip-bot2@tip-bot2> Robot-ID: Robot-Unsubscribe: Contact to get blacklisted from these emails Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org The following commit has been merged into the x86/kdump branch of tip: Commit-ID: 69243968bd526641e549ed231c750ce92e3eeb35 Gitweb: https://git.kernel.org/tip/69243968bd526641e549ed231c750ce92e3eeb35 Author: Jonathan McDowell AuthorDate: Thu, 16 Jun 2022 15:30:11 Committer: Borislav Petkov CommitterDate: Sun, 26 Jun 2022 17:20:11 +02:00 x86/kexec: Carry forward IMA measurement log on kexec On kexec file load, the Integrity Measurement Architecture (IMA) subsystem may verify the IMA signature of the kernel and initramfs, and measure it. The command line parameters passed to the kernel in the kexec call may also be measured by IMA. A remote attestation service can verify a TPM quote based on the TPM event log, the IMA measurement list and the TPM PCR data. This can be achieved only if the IMA measurement log is carried over from the current kernel to the next kernel across the kexec call. PowerPC and ARM64 both achieve this using device tree with a "linux,ima-kexec-buffer" node. x86 platforms generally don't make use of device tree, so use the setup_data mechanism to pass the IMA buffer to the new kernel. [ bp: Touchups. ] Signed-off-by: Jonathan McDowell Signed-off-by: Borislav Petkov Reviewed-by: Mimi Zohar # IMA function definitions Reviewed-by: Baoquan He Link: https://lore.kernel.org/r/YmKyvlF3my1yWTvK@noodles-fedora-PC23Y6EG --- arch/x86/Kconfig | 1 +- arch/x86/include/uapi/asm/bootparam.h | 9 ++++- arch/x86/kernel/e820.c | 6 +- arch/x86/kernel/kexec-bzimage64.c | 42 ++++++++++++++++- arch/x86/kernel/setup.c | 63 ++++++++++++++++++++++++++- drivers/of/kexec.c | 9 +--- include/linux/ima.h | 5 ++- include/linux/of.h | 2 +- security/integrity/ima/ima_kexec.c | 2 +- 9 files changed, 125 insertions(+), 14 deletions(-) diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig index be0b95e..670e0ed 100644 --- a/arch/x86/Kconfig +++ b/arch/x86/Kconfig @@ -2033,6 +2033,7 @@ config KEXEC_FILE bool "kexec file based system call" select KEXEC_CORE select BUILD_BIN2C + select HAVE_IMA_KEXEC if IMA depends on X86_64 depends on CRYPTO=y depends on CRYPTO_SHA256=y diff --git a/arch/x86/include/uapi/asm/bootparam.h b/arch/x86/include/uapi/asm/bootparam.h index bea5cdc..ca0796a 100644 --- a/arch/x86/include/uapi/asm/bootparam.h +++ b/arch/x86/include/uapi/asm/bootparam.h @@ -11,6 +11,7 @@ #define SETUP_APPLE_PROPERTIES 5 #define SETUP_JAILHOUSE 6 #define SETUP_CC_BLOB 7 +#define SETUP_IMA 8 #define SETUP_INDIRECT (1<<31) @@ -172,6 +173,14 @@ struct jailhouse_setup_data { } __attribute__((packed)) v2; } __attribute__((packed)); +/* + * IMA buffer setup data information from the previous kernel during kexec + */ +struct ima_setup_data { + __u64 addr; + __u64 size; +} __attribute__((packed)); + /* The so-called "zeropage" */ struct boot_params { struct screen_info screen_info; /* 0x000 */ diff --git a/arch/x86/kernel/e820.c b/arch/x86/kernel/e820.c index f267205..9dac246 100644 --- a/arch/x86/kernel/e820.c +++ b/arch/x86/kernel/e820.c @@ -1017,10 +1017,10 @@ void __init e820__reserve_setup_data(void) e820__range_update(pa_data, sizeof(*data)+data->len, E820_TYPE_RAM, E820_TYPE_RESERVED_KERN); /* - * SETUP_EFI is supplied by kexec and does not need to be - * reserved. + * SETUP_EFI and SETUP_IMA are supplied by kexec and do not need + * to be reserved. */ - if (data->type != SETUP_EFI) + if (data->type != SETUP_EFI && data->type != SETUP_IMA) e820__range_update_kexec(pa_data, sizeof(*data) + data->len, E820_TYPE_RAM, E820_TYPE_RESERVED_KERN); diff --git a/arch/x86/kernel/kexec-bzimage64.c b/arch/x86/kernel/kexec-bzimage64.c index 170d0fd..c63974e 100644 --- a/arch/x86/kernel/kexec-bzimage64.c +++ b/arch/x86/kernel/kexec-bzimage64.c @@ -186,11 +186,38 @@ setup_efi_state(struct boot_params *params, unsigned long params_load_addr, } #endif /* CONFIG_EFI */ +static void +setup_ima_state(const struct kimage *image, struct boot_params *params, + unsigned long params_load_addr, + unsigned int ima_setup_data_offset) +{ +#ifdef CONFIG_IMA_KEXEC + struct setup_data *sd = (void *)params + ima_setup_data_offset; + unsigned long setup_data_phys; + struct ima_setup_data *ima; + + if (!image->ima_buffer_size) + return; + + sd->type = SETUP_IMA; + sd->len = sizeof(*ima); + + ima = (void *)sd + sizeof(struct setup_data); + ima->addr = image->ima_buffer_addr; + ima->size = image->ima_buffer_size; + + /* Add setup data */ + setup_data_phys = params_load_addr + ima_setup_data_offset; + sd->next = params->hdr.setup_data; + params->hdr.setup_data = setup_data_phys; +#endif /* CONFIG_IMA_KEXEC */ +} + static int setup_boot_parameters(struct kimage *image, struct boot_params *params, unsigned long params_load_addr, unsigned int efi_map_offset, unsigned int efi_map_sz, - unsigned int efi_setup_data_offset) + unsigned int setup_data_offset) { unsigned int nr_e820_entries; unsigned long long mem_k, start, end; @@ -245,8 +272,15 @@ setup_boot_parameters(struct kimage *image, struct boot_params *params, #ifdef CONFIG_EFI /* Setup EFI state */ setup_efi_state(params, params_load_addr, efi_map_offset, efi_map_sz, - efi_setup_data_offset); + setup_data_offset); + setup_data_offset += sizeof(struct setup_data) + + sizeof(struct efi_setup_data); #endif + + /* Setup IMA log buffer state */ + setup_ima_state(image, params, params_load_addr, + setup_data_offset); + /* Setup EDD info */ memcpy(params->eddbuf, boot_params.eddbuf, EDDMAXNR * sizeof(struct edd_info)); @@ -403,6 +437,10 @@ static void *bzImage64_load(struct kimage *image, char *kernel, sizeof(struct setup_data) + sizeof(struct efi_setup_data); + if (IS_ENABLED(CONFIG_IMA_KEXEC)) + kbuf.bufsz += sizeof(struct setup_data) + + sizeof(struct ima_setup_data); + params = kzalloc(kbuf.bufsz, GFP_KERNEL); if (!params) return ERR_PTR(-ENOMEM); diff --git a/arch/x86/kernel/setup.c b/arch/x86/kernel/setup.c index bd6c6fd..482f470 100644 --- a/arch/x86/kernel/setup.c +++ b/arch/x86/kernel/setup.c @@ -11,6 +11,7 @@ #include #include #include +#include #include #include #include @@ -140,6 +141,11 @@ __visible unsigned long mmu_cr4_features __ro_after_init; __visible unsigned long mmu_cr4_features __ro_after_init = X86_CR4_PAE; #endif +#ifdef CONFIG_IMA +static phys_addr_t ima_kexec_buffer_phys; +static size_t ima_kexec_buffer_size; +#endif + /* Boot loader ID and version as integers, for the benefit of proc_dointvec */ int bootloader_type, bootloader_version; @@ -330,6 +336,60 @@ static void __init reserve_initrd(void) } #endif /* CONFIG_BLK_DEV_INITRD */ +static void __init add_early_ima_buffer(u64 phys_addr) +{ +#ifdef CONFIG_IMA + struct ima_setup_data *data; + + data = early_memremap(phys_addr + sizeof(struct setup_data), sizeof(*data)); + if (!data) { + pr_warn("setup: failed to memremap ima_setup_data entry\n"); + return; + } + + if (data->size) { + memblock_reserve(data->addr, data->size); + ima_kexec_buffer_phys = data->addr; + ima_kexec_buffer_size = data->size; + } + + early_memunmap(data, sizeof(*data)); +#else + pr_warn("Passed IMA kexec data, but CONFIG_IMA not set. Ignoring.\n"); +#endif +} + +#if defined(CONFIG_HAVE_IMA_KEXEC) && !defined(CONFIG_OF_FLATTREE) +int __meminit ima_free_kexec_buffer(void) +{ + int rc; + + if (!ima_kexec_buffer_size) + return -ENOENT; + + rc = memblock_phys_free(ima_kexec_buffer_phys, + ima_kexec_buffer_size); + if (rc) + return rc; + + ima_kexec_buffer_phys = 0; + ima_kexec_buffer_size = 0; + + return 0; +} + +int __init ima_get_kexec_buffer(void **addr, size_t *size) +{ + if (!ima_kexec_buffer_size) + return -ENOENT; + + *addr = __va(ima_kexec_buffer_phys); + *size = ima_kexec_buffer_size; + + return 0; +} +#endif + static void __init parse_setup_data(void) { struct setup_data *data; @@ -355,6 +415,9 @@ static void __init parse_setup_data(void) case SETUP_EFI: parse_efi_setup(pa_data, data_len); break; + case SETUP_IMA: + add_early_ima_buffer(pa_data); + break; default: break; } diff --git a/drivers/of/kexec.c b/drivers/of/kexec.c index 8d374cc..d3ec430 100644 --- a/drivers/of/kexec.c +++ b/drivers/of/kexec.c @@ -9,6 +9,7 @@ * Copyright (C) 2016 IBM Corporation */ +#include #include #include #include @@ -115,6 +116,7 @@ static int do_get_kexec_buffer(const void *prop, int len, unsigned long *addr, return 0; } +#ifdef CONFIG_HAVE_IMA_KEXEC /** * ima_get_kexec_buffer - get IMA buffer from the previous kernel * @addr: On successful return, set to point to the buffer contents. @@ -129,9 +131,6 @@ int ima_get_kexec_buffer(void **addr, size_t *size) size_t tmp_size; const void *prop; - if (!IS_ENABLED(CONFIG_HAVE_IMA_KEXEC)) - return -ENOTSUPP; - prop = of_get_property(of_chosen, "linux,ima-kexec-buffer", &len); if (!prop) return -ENOENT; @@ -156,9 +155,6 @@ int ima_free_kexec_buffer(void) size_t size; struct property *prop; - if (!IS_ENABLED(CONFIG_HAVE_IMA_KEXEC)) - return -ENOTSUPP; - prop = of_find_property(of_chosen, "linux,ima-kexec-buffer", NULL); if (!prop) return -ENOENT; @@ -173,6 +169,7 @@ int ima_free_kexec_buffer(void) return memblock_phys_free(addr, size); } +#endif /** * remove_ima_buffer - remove the IMA buffer property and reservation from @fdt diff --git a/include/linux/ima.h b/include/linux/ima.h index 426b174..ff4bd99 100644 --- a/include/linux/ima.h +++ b/include/linux/ima.h @@ -140,6 +140,11 @@ static inline int ima_measure_critical_data(const char *event_label, #endif /* CONFIG_IMA */ +#ifdef CONFIG_HAVE_IMA_KEXEC +int ima_free_kexec_buffer(void); +int ima_get_kexec_buffer(void **addr, size_t *size); +#endif + #ifdef CONFIG_IMA_SECURE_AND_OR_TRUSTED_BOOT extern bool arch_ima_get_secureboot(void); extern const char * const *arch_get_ima_policy(void); diff --git a/include/linux/of.h b/include/linux/of.h index f0a5d6b..20a4e7c 100644 --- a/include/linux/of.h +++ b/include/linux/of.h @@ -441,8 +441,6 @@ void *of_kexec_alloc_and_setup_fdt(const struct kimage *image, unsigned long initrd_load_addr, unsigned long initrd_len, const char *cmdline, size_t extra_fdt_size); -int ima_get_kexec_buffer(void **addr, size_t *size); -int ima_free_kexec_buffer(void); #else /* CONFIG_OF */ static inline void of_core_init(void) diff --git a/security/integrity/ima/ima_kexec.c b/security/integrity/ima/ima_kexec.c index 1375313..419dc40 100644 --- a/security/integrity/ima/ima_kexec.c +++ b/security/integrity/ima/ima_kexec.c @@ -137,7 +137,7 @@ void ima_add_kexec_buffer(struct kimage *image) /* * Restore the measurement list from the previous kernel. */ -void ima_load_kexec_buffer(void) +void __init ima_load_kexec_buffer(void) { void *kexec_buffer = NULL; size_t kexec_buffer_size = 0;