From patchwork Tue Oct 25 14:12:52 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Evgeniy Baskov X-Patchwork-Id: 13019335 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 3D5E3FA3743 for ; Tue, 25 Oct 2022 14:14:22 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233071AbiJYOOU (ORCPT ); Tue, 25 Oct 2022 10:14:20 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:46148 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233043AbiJYONw (ORCPT ); Tue, 25 Oct 2022 10:13:52 -0400 Received: from mail.ispras.ru (mail.ispras.ru [83.149.199.84]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 3B9D5A485F; Tue, 25 Oct 2022 07:13:50 -0700 (PDT) Received: from localhost.localdomain (unknown [83.149.199.65]) by mail.ispras.ru (Postfix) with ESMTPSA id AFC4B40737B0; Tue, 25 Oct 2022 14:13:48 +0000 (UTC) DKIM-Filter: OpenDKIM Filter v2.11.0 mail.ispras.ru AFC4B40737B0 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=ispras.ru; s=default; t=1666707228; bh=dTEKS+twdCc3BuOiQmL2rt+dm6JwiYtOXDBWNvRh+HU=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=XkHD8wpXOt/5CTGbck/z4PwKzDIiZUJm5+z1Lx0bO1CHeCyGFCSv5Do28Rtxedz/p sQ8B9k5qrRwu/Ggz3lFVujvAJNrVMzSXq7kkuzukYRDNZl4gBGCm1IcLudIx2gHuwk 4wIHz5lcPkXlBYEDD5Bb0KUDuQr3G3VRW1//vRkc= From: Evgeniy Baskov To: Ard Biesheuvel Cc: Evgeniy Baskov , Borislav Petkov , Andy Lutomirski , Dave Hansen , Ingo Molnar , Peter Zijlstra , Thomas Gleixner , Alexey Khoroshilov , Peter Jones , lvc-project@linuxtesting.org, x86@kernel.org, linux-efi@vger.kernel.org, linux-kernel@vger.kernel.org, linux-hardening@vger.kernel.org Subject: [PATCH v2 14/23] x86/boot: Add EFI kernel extraction interface Date: Tue, 25 Oct 2022 17:12:52 +0300 Message-Id: X-Mailer: git-send-email 2.37.4 In-Reply-To: References: MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-hardening@vger.kernel.org To enable extraction of kernel image from EFI stub code directly extraction code needs to have separate interface that avoid part of low level initialization logic, i.e. serial port setup. Add kernel extraction function callable from libstub as a part of preparation for extracting the kernel directly from EFI environment. Signed-off-by: Evgeniy Baskov --- arch/x86/boot/compressed/head_32.S | 3 +- arch/x86/boot/compressed/head_64.S | 2 +- arch/x86/boot/compressed/misc.c | 101 +++++++++++++++++--------- arch/x86/boot/compressed/misc.h | 1 + arch/x86/include/asm/shared/extract.h | 27 +++++++ 5 files changed, 98 insertions(+), 36 deletions(-) create mode 100644 arch/x86/include/asm/shared/extract.h diff --git a/arch/x86/boot/compressed/head_32.S b/arch/x86/boot/compressed/head_32.S index 3b354eb9516d..b46a1c4109cf 100644 --- a/arch/x86/boot/compressed/head_32.S +++ b/arch/x86/boot/compressed/head_32.S @@ -217,8 +217,7 @@ SYM_DATA(image_offset, .long 0) */ .bss .balign 4 -boot_heap: - .fill BOOT_HEAP_SIZE, 1, 0 +SYM_DATA(boot_heap, .fill BOOT_HEAP_SIZE, 1, 0) boot_stack: .fill BOOT_STACK_SIZE, 1, 0 boot_stack_end: diff --git a/arch/x86/boot/compressed/head_64.S b/arch/x86/boot/compressed/head_64.S index 73a2ac2b063d..6cfcdeb4531b 100644 --- a/arch/x86/boot/compressed/head_64.S +++ b/arch/x86/boot/compressed/head_64.S @@ -1006,7 +1006,7 @@ SYM_FUNC_END(startup32_check_sev_cbit) */ .bss .balign 4 -SYM_DATA_LOCAL(boot_heap, .fill BOOT_HEAP_SIZE, 1, 0) +SYM_DATA(boot_heap, .fill BOOT_HEAP_SIZE, 1, 0) SYM_DATA_START_LOCAL(boot_stack) .fill BOOT_STACK_SIZE, 1, 0 diff --git a/arch/x86/boot/compressed/misc.c b/arch/x86/boot/compressed/misc.c index c9c235d65d16..59264720e87e 100644 --- a/arch/x86/boot/compressed/misc.c +++ b/arch/x86/boot/compressed/misc.c @@ -308,11 +308,11 @@ static inline unsigned long kernel_add_identity_map_dummy(unsigned long start, * |-------uncompressed kernel image---------| * */ -asmlinkage __visible void *extract_kernel(void *rmode, memptr heap, - unsigned char *input_data, - unsigned long input_len, - unsigned char *output, - unsigned long output_len) +static void *do_extract_kernel(void *rmode, + unsigned char *input_data, + unsigned long input_len, + unsigned char *output, + unsigned long output_len) { const unsigned long kernel_total_size = VO__end - VO__text; unsigned long virt_addr = LOAD_PHYSICAL_ADDR; @@ -326,26 +326,6 @@ asmlinkage __visible void *extract_kernel(void *rmode, memptr heap, sanitize_boot_params(boot_params); - init_default_io_ops(); - - /* - * On 64-bit this pointer is set during page table uninitialization, - * but on 32-bit it remains uninitialized, since paging is disabled. - */ - if (IS_ENABLED(CONFIG_X86_32)) - kernel_add_identity_map = kernel_add_identity_map_dummy; - - - /* - * Detect TDX guest environment. - * - * It has to be done before console_init() in order to use - * paravirtualized port I/O operations if needed. - */ - early_tdx_detect(); - - init_bare_console(); - /* * Save RSDP address for later use. Have this after console_init() * so that early debugging output from the RSDP parsing code can be @@ -353,11 +333,6 @@ asmlinkage __visible void *extract_kernel(void *rmode, memptr heap, */ boot_params->acpi_rsdp_addr = get_rsdp_addr(); - debug_putstr("early console in extract_kernel\n"); - - free_mem_ptr = heap; /* Heap */ - free_mem_end_ptr = heap + BOOT_HEAP_SIZE; - /* * The memory hole needed for the kernel is the larger of either * the entire decompressed kernel plus relocation table, or the @@ -411,12 +386,12 @@ asmlinkage __visible void *extract_kernel(void *rmode, memptr heap, if (virt_addr & (MIN_KERNEL_ALIGN - 1)) error("Destination virtual address inappropriately aligned"); #ifdef CONFIG_X86_64 - if (heap > 0x3fffffffffffUL) + if (phys_addr > 0x3fffffffffffUL) error("Destination address too large"); if (virt_addr + max(output_len, kernel_total_size) > KERNEL_IMAGE_SIZE) error("Destination virtual address is beyond the kernel mapping area"); #else - if (heap > ((-__PAGE_OFFSET-(128<<20)-1) & 0x7fffffff)) + if (phys_addr > ((-__PAGE_OFFSET-(128<<20)-1) & 0x7fffffff)) error("Destination address too large"); #endif #ifndef CONFIG_RELOCATABLE @@ -430,12 +405,72 @@ asmlinkage __visible void *extract_kernel(void *rmode, memptr heap, parse_elf(output, output_len, virt_addr); debug_putstr("done.\nBooting the kernel.\n"); + return output; +} + +asmlinkage __visible void *extract_kernel(void *rmode, memptr heap, + unsigned char *input_data, + unsigned long input_len, + unsigned char *output, + unsigned long output_len) +{ + void *entry; + + init_default_io_ops(); + + /* + * On 64-bit this pointer is set during page table uninitialization, + * but on 32-bit it remains uninitialized, since paging is disabled. + */ + if (IS_ENABLED(CONFIG_X86_32)) + kernel_add_identity_map = kernel_add_identity_map_dummy; + + /* + * Detect TDX guest environment. + * + * It has to be done before console_init() in order to use + * paravirtualized port I/O operations if needed. + */ + early_tdx_detect(); + + init_bare_console(); + + debug_putstr("early console in extract_kernel\n"); + + free_mem_ptr = heap; /* Heap */ + free_mem_end_ptr = heap + BOOT_HEAP_SIZE; + + entry = do_extract_kernel(rmode, input_data, + input_len, output, output_len); + /* Disable exception handling before booting the kernel */ cleanup_exception_handling(); - return output; + return entry; } +void *efi_extract_kernel(struct boot_params *rmode, + struct efi_extract_callbacks *cb, + unsigned char *input_data, + unsigned long input_len, + unsigned char *output, + unsigned long output_len) +{ + extern char boot_heap[BOOT_HEAP_SIZE]; + + free_mem_ptr = (unsigned long)boot_heap; /* Heap */ + free_mem_end_ptr = (unsigned long)boot_heap + BOOT_HEAP_SIZE; + + init_console_func(cb->putstr, cb->puthex); + kernel_add_identity_map = cb->map_range; + + return do_extract_kernel(rmode, input_data, + input_len, output, output_len); +} + + + + void fortify_panic(const char *name) { error("detected buffer overflow"); diff --git a/arch/x86/boot/compressed/misc.h b/arch/x86/boot/compressed/misc.h index 0076b2845b4b..379c4a3ca7dd 100644 --- a/arch/x86/boot/compressed/misc.h +++ b/arch/x86/boot/compressed/misc.h @@ -26,6 +26,7 @@ #include #include #include +#include #include "tdx.h" diff --git a/arch/x86/include/asm/shared/extract.h b/arch/x86/include/asm/shared/extract.h new file mode 100644 index 000000000000..ebbc93333c74 --- /dev/null +++ b/arch/x86/include/asm/shared/extract.h @@ -0,0 +1,27 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#ifndef ASM_SHARED_EXTRACT_H +#define ASM_SHARED_EXTRACT_H + +#include + +#define MAP_WRITE 0x02 /* Writable memory */ +#define MAP_EXEC 0x04 /* Executable memory */ +#define MAP_ALLOC 0x10 /* Range needs to be allocated */ +#define MAP_PROTECT 0x20 /* Set exact memory attributes for memory range */ + +struct efi_extract_callbacks { + void (*putstr)(const char *msg); + void (*puthex)(unsigned long x); + unsigned long (*map_range)(unsigned long start, + unsigned long end, + unsigned int flags); +}; + +void *efi_extract_kernel(struct boot_params *rmode, + struct efi_extract_callbacks *cb, + unsigned char *input_data, + unsigned long input_len, + unsigned char *output, + unsigned long output_len); + +#endif /* ASM_SHARED_EXTRACT_H */