From patchwork Tue Mar 14 10:13:41 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Evgeniy Baskov X-Patchwork-Id: 13173990 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 68CA2C7618A for ; Tue, 14 Mar 2023 10:20:24 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229830AbjCNKUW (ORCPT ); Tue, 14 Mar 2023 06:20:22 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:40704 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229797AbjCNKTo (ORCPT ); Tue, 14 Mar 2023 06:19:44 -0400 Received: from mail.ispras.ru (mail.ispras.ru [83.149.199.84]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 38C617A917; Tue, 14 Mar 2023 03:19:11 -0700 (PDT) Received: from localhost.localdomain (unknown [83.149.199.65]) by mail.ispras.ru (Postfix) with ESMTPSA id 8ECE84076B4A; Tue, 14 Mar 2023 10:18:03 +0000 (UTC) DKIM-Filter: OpenDKIM Filter v2.11.0 mail.ispras.ru 8ECE84076B4A DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=ispras.ru; s=default; t=1678789083; bh=NKickpgUaD8tibH5xFyKu4KWqgRZ3RSyVuaxOysglBg=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=g8pvNCk0uqZzZtzis6YvdDA3h/SybG5FqttFB2cDzZ8n7y+I+4h2KKoi6qLNozpMM nQg1uWUEfe/aeRF52UJYsae2i/yAgoh9PEHWMyHu+lu7/kKWlIMEjZ7oL4DNh30xPK pUywr4pkZPzRswBts1U8wIBzyPiFaW21Cm3srcSg= 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 , Gerd Hoffmann , "Limonciello, Mario" , joeyli , lvc-project@linuxtesting.org, x86@kernel.org, linux-efi@vger.kernel.org, linux-kernel@vger.kernel.org, linux-hardening@vger.kernel.org Subject: [PATCH v5 14/27] x86/boot: Add EFI kernel extraction interface Date: Tue, 14 Mar 2023 13:13:41 +0300 Message-Id: X-Mailer: git-send-email 2.39.2 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. Tested-by: Mario Limonciello 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 | 100 +++++++++++++++++--------- arch/x86/boot/compressed/misc.h | 1 + arch/x86/include/asm/shared/extract.h | 26 +++++++ 5 files changed, 96 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 987ae727cf9f..15545781ea48 100644 --- a/arch/x86/boot/compressed/head_32.S +++ b/arch/x86/boot/compressed/head_32.S @@ -213,8 +213,7 @@ SYM_DATA_END_LABEL(gdt, SYM_L_LOCAL, gdt_end) */ .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 7774daf90a19..8af7835de3b1 100644 --- a/arch/x86/boot/compressed/head_64.S +++ b/arch/x86/boot/compressed/head_64.S @@ -747,7 +747,7 @@ SYM_DATA_END_LABEL(boot_idt, SYM_L_GLOBAL, boot_idt_end) */ .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 74f028cf2dfd..925774d0288f 100644 --- a/arch/x86/boot/compressed/misc.c +++ b/arch/x86/boot/compressed/misc.c @@ -310,11 +310,11 @@ static 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; @@ -329,26 +329,6 @@ 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 @@ -356,11 +336,6 @@ 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 @@ -418,12 +393,12 @@ 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 @@ -440,12 +415,71 @@ asmlinkage __visible void *extract_kernel(void *rmode, memptr heap, debug_puthex(entry_offset); debug_putstr(").\n"); + return output + entry_offset; +} + +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 + entry_offset; + return entry; } +void *efi_extract_kernel(struct boot_params *rmode, + struct efi_extract_callbacks *cb, + unsigned char *input_data, + unsigned long input_len, + 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, (void *)LOAD_PHYSICAL_ADDR, 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 fe201b45b038..6c67152c862d 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..46bf56348a86 --- /dev/null +++ b/arch/x86/include/asm/shared/extract.h @@ -0,0 +1,26 @@ +/* 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 long output_len); + +#endif /* ASM_SHARED_EXTRACT_H */