From patchwork Mon Aug 7 16:27:17 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Ard Biesheuvel X-Patchwork-Id: 711713 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 C60F8C001DB for ; Mon, 7 Aug 2023 16:29:22 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231605AbjHGQ3V (ORCPT ); Mon, 7 Aug 2023 12:29:21 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:35590 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231728AbjHGQ3C (ORCPT ); Mon, 7 Aug 2023 12:29:02 -0400 Received: from dfw.source.kernel.org (dfw.source.kernel.org [IPv6:2604:1380:4641:c500::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id F2C411BF3; Mon, 7 Aug 2023 09:28:23 -0700 (PDT) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits)) (No client certificate requested) by dfw.source.kernel.org (Postfix) with ESMTPS id 989D561F1C; Mon, 7 Aug 2023 16:28:23 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 8036BC433BB; Mon, 7 Aug 2023 16:28:21 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1691425703; bh=35ydgYIIKoLxZL2vz2F8XVJhO0j9D3mjWHEuMrtQ7Ck=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=ssqE4t2IQ41OEktqZdVAF4gYDntvq/TfpZG5+4tT+PJasiKss/fje4B5BgpfsYF7n MaFyt4IqJr+ZxsWT6iSGlV17EZnLlhs3dsdIVfrHWTT1CNcy67APEFTMnbSq+Sizel XuSK6ZIytlOqjmyxGkNGFOPTYPQUMLOZGv1/yc+quuuc15EtrxgI0l8HUZGa+kwYH0 2DTkMi7EqFWOdL9iycADY2XsLvvRZBMuhnQP9M7UnLFgrl4sTyH9z1Y0sWunkL+I5x OqAtt2s6eygHtBSQ6JrrKZqUe3AkbPoWYKyMhB4553DzBU5aGjHVmUgu2HIPe3LRsn 0FGB7kJMfqHtQ== From: Ard Biesheuvel To: linux-efi@vger.kernel.org Cc: linux-kernel@vger.kernel.org, Ard Biesheuvel , Borislav Petkov , Dave Hansen , Ingo Molnar , Thomas Gleixner Subject: [PATCH v9 20/23] x86/decompressor: Factor out kernel decompression and relocation Date: Mon, 7 Aug 2023 18:27:17 +0200 Message-Id: <20230807162720.545787-21-ardb@kernel.org> X-Mailer: git-send-email 2.39.2 In-Reply-To: <20230807162720.545787-1-ardb@kernel.org> References: <20230807162720.545787-1-ardb@kernel.org> MIME-Version: 1.0 X-Developer-Signature: v=1; a=openpgp-sha256; l=2968; i=ardb@kernel.org; h=from:subject; bh=35ydgYIIKoLxZL2vz2F8XVJhO0j9D3mjWHEuMrtQ7Ck=; b=owGbwMvMwCFmkMcZplerG8N4Wi2JIeWidMqCOW4KNUnqByqPOCZ13eQrkfQ6c6z99LL6qz3rP l+M8PzUUcrCIMbBICumyCIw+++7nacnStU6z5KFmcPKBDKEgYtTACZyOIKR4cihX7sM/n+x1dhr 5FEZpFN5teWZrnqXveXiD4VrSl3iFzMyTL4/M9NERzP14xXZa7uYbwZsM17Yufj6dfsPvkkm/7v iGAE= X-Developer-Key: i=ardb@kernel.org; a=openpgp; fpr=F43D03328115A198C90016883D200E9CA6329909 Precedence: bulk List-ID: X-Mailing-List: linux-efi@vger.kernel.org Factor out the decompressor sequence that invokes the decompressor, parses the ELF and applies the relocations so that it can be called directly from the EFI stub. Signed-off-by: Ard Biesheuvel --- arch/x86/boot/compressed/misc.c | 28 ++++++++++++++++---- arch/x86/include/asm/boot.h | 8 ++++++ 2 files changed, 31 insertions(+), 5 deletions(-) diff --git a/arch/x86/boot/compressed/misc.c b/arch/x86/boot/compressed/misc.c index 2d91d56b59e1af93..f711f2a85862e9ef 100644 --- a/arch/x86/boot/compressed/misc.c +++ b/arch/x86/boot/compressed/misc.c @@ -330,11 +330,33 @@ static size_t parse_elf(void *output) return ehdr.e_entry - LOAD_PHYSICAL_ADDR; } +const unsigned long kernel_total_size = VO__end - VO__text; + static u8 boot_heap[BOOT_HEAP_SIZE] __aligned(4); extern unsigned char input_data[]; extern unsigned int input_len, output_len; +unsigned long decompress_kernel(unsigned char *outbuf, unsigned long virt_addr, + void (*error)(char *x)) +{ + unsigned long entry; + + if (!free_mem_ptr) { + free_mem_ptr = (unsigned long)boot_heap; + free_mem_end_ptr = (unsigned long)boot_heap + sizeof(boot_heap); + } + + if (__decompress(input_data, input_len, NULL, NULL, outbuf, output_len, + NULL, error) < 0) + return ULONG_MAX; + + entry = parse_elf(outbuf); + handle_relocations(outbuf, output_len, virt_addr); + + return entry; +} + /* * The compressed kernel image (ZO), has been moved so that its position * is against the end of the buffer used to hold the uncompressed kernel @@ -354,7 +376,6 @@ extern unsigned int input_len, output_len; */ asmlinkage __visible void *extract_kernel(void *rmode, unsigned char *output) { - const unsigned long kernel_total_size = VO__end - VO__text; unsigned long virt_addr = LOAD_PHYSICAL_ADDR; memptr heap = (memptr)boot_heap; unsigned long needed_size; @@ -463,10 +484,7 @@ asmlinkage __visible void *extract_kernel(void *rmode, unsigned char *output) accept_memory(__pa(output), __pa(output) + needed_size); } - __decompress(input_data, input_len, NULL, NULL, output, output_len, - NULL, error); - entry_offset = parse_elf(output); - handle_relocations(output, output_len, virt_addr); + entry_offset = decompress_kernel(output, virt_addr, error); debug_putstr("done.\nBooting the kernel (entry_offset: 0x"); debug_puthex(entry_offset); diff --git a/arch/x86/include/asm/boot.h b/arch/x86/include/asm/boot.h index 9191280d9ea3160d..4ae14339cb8cc72d 100644 --- a/arch/x86/include/asm/boot.h +++ b/arch/x86/include/asm/boot.h @@ -62,4 +62,12 @@ # define BOOT_STACK_SIZE 0x1000 #endif +#ifndef __ASSEMBLY__ +extern unsigned int output_len; +extern const unsigned long kernel_total_size; + +unsigned long decompress_kernel(unsigned char *outbuf, unsigned long virt_addr, + void (*error)(char *x)); +#endif + #endif /* _ASM_X86_BOOT_H */