From patchwork Tue Apr 18 13:49:48 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Ard Biesheuvel X-Patchwork-Id: 676730 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 B37F8C6FD18 for ; Tue, 18 Apr 2023 13:50:13 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229756AbjDRNuN (ORCPT ); Tue, 18 Apr 2023 09:50:13 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:36734 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232278AbjDRNuL (ORCPT ); Tue, 18 Apr 2023 09:50:11 -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 22BD1468D for ; Tue, 18 Apr 2023 06:50:09 -0700 (PDT) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by dfw.source.kernel.org (Postfix) with ESMTPS id AF6BE62845 for ; Tue, 18 Apr 2023 13:50:08 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 9F3F3C4339B; Tue, 18 Apr 2023 13:50:06 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1681825808; bh=vgDh/RZI17YIdpHDLz/KRWWk764g3EIBUUFAxv5YzVY=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=DjaOReOAdZGeGHfxZlUhOHHsPy/K40b0p957rR7qmufsekHIceGm9DiCdFpaDWn3U GyW6eTF9g96Khb8x/X3T45ZO4ODFF48d8io40wRQW7a1mG/58SFcjCWPokvAQjcP4S vAaPmIGX74jX9ROoVi1LdZkinHN3yPi2UAqMgKTH3ly2VXvosz59rmXzE7gfPB4vYe dOA7G+uryhtdbu4psJ1LtX+ScXIWEv4BTHCl7jYR6LdZDs/TtkqJEbHsBIGDyjDUDc JHipOiJR1kSzc9z9r7kiJv/b2HC3L0j/YsvzegayqXk6DORFU7ohIffFYDixTxLnrb tguR221kfyjSQ== From: Ard Biesheuvel To: linux-efi@vger.kernel.org Cc: linux-arm-kernel@lists.infradead.org, mark.rutland@arm.com, broonie@kernel.org, will@kernel.org, catalin.marinas@arm.com, Ard Biesheuvel Subject: [PATCH v2 2/6] arm64: efi: Enable BTI codegen and add PE/COFF annotation Date: Tue, 18 Apr 2023 15:49:48 +0200 Message-Id: <20230418134952.1170141-3-ardb@kernel.org> X-Mailer: git-send-email 2.39.2 In-Reply-To: <20230418134952.1170141-1-ardb@kernel.org> References: <20230418134952.1170141-1-ardb@kernel.org> MIME-Version: 1.0 X-Developer-Signature: v=1; a=openpgp-sha256; l=4886; i=ardb@kernel.org; h=from:subject; bh=vgDh/RZI17YIdpHDLz/KRWWk764g3EIBUUFAxv5YzVY=; b=owGbwMvMwCFmkMcZplerG8N4Wi2JIcVu/i+rTjZ2fvm168X+STC+zlI+WBnLU6Yw22vGqSTNZ pE7XEIdpSwMYhwMsmKKLAKz/77beXqiVK3zLFmYOaxMIEMYuDgFYCLxpxn+igc9f/OO023a1yM9 0v/X7DKxZHXpNP33aAF/3cYFk9wrxBkZJrmkcAYpZz9sM/quc4axbUJc/4U1x6tcBNo6Kuf6Fzf wAwA= X-Developer-Key: i=ardb@kernel.org; a=openpgp; fpr=F43D03328115A198C90016883D200E9CA6329909 Precedence: bulk List-ID: X-Mailing-List: linux-efi@vger.kernel.org UEFI heavily relies on so-called protocols, which are essentially tables populated with pointers to executable code, and these are invoked indirectly using BR or BLR instructions. This makes the EFI execution context vulnerable to attacks on forward edge control flow, and so it would help if we could enable hardware enforcement (BTI) on CPUs that implement it. So let's no longer disable BTI codegen for the EFI stub, and set the newly introduced PE/COFF header flag when the kernel is built with BTI landing pads. Signed-off-by: Ard Biesheuvel Reviewed-by: Mark Brown --- arch/arm64/kernel/efi-header.S | 71 ++++++++++++-------- drivers/firmware/efi/libstub/Makefile | 3 +- 2 files changed, 44 insertions(+), 30 deletions(-) diff --git a/arch/arm64/kernel/efi-header.S b/arch/arm64/kernel/efi-header.S index d731b4655df8eb27..11d7f7de202d0ed2 100644 --- a/arch/arm64/kernel/efi-header.S +++ b/arch/arm64/kernel/efi-header.S @@ -81,9 +81,47 @@ .quad 0 // CertificationTable .quad 0 // BaseRelocationTable -#ifdef CONFIG_DEBUG_EFI +#if defined(CONFIG_DEBUG_EFI) || defined(CONFIG_ARM64_BTI_KERNEL) .long .Lefi_debug_table - .L_head // DebugTable .long .Lefi_debug_table_size + + /* + * The debug table is referenced via its Relative Virtual Address (RVA), + * which is only defined for those parts of the image that are covered + * by a section declaration. Since this header is not covered by any + * section, the debug table must be emitted elsewhere. So stick it in + * the .init.rodata section instead. + * + * Note that the payloads themselves are permitted to have zero RVAs, + * which means we can simply put those right after the section headers. + */ + __INITRODATA + + .align 2 +.Lefi_debug_table: +#ifdef CONFIG_DEBUG_EFI + // EFI_IMAGE_DEBUG_DIRECTORY_ENTRY + .long 0 // Characteristics + .long 0 // TimeDateStamp + .short 0 // MajorVersion + .short 0 // MinorVersion + .long IMAGE_DEBUG_TYPE_CODEVIEW // Type + .long .Lefi_debug_entry_size // SizeOfData + .long 0 // RVA + .long .Lefi_debug_entry - .L_head // FileOffset +#endif +#ifdef CONFIG_ARM64_BTI_KERNEL + .long 0 // Characteristics + .long 0 // TimeDateStamp + .short 0 // MajorVersion + .short 0 // MinorVersion + .long IMAGE_DEBUG_TYPE_EX_DLLCHARACTERISTICS // Type + .long 4 // SizeOfData + .long 0 // RVA + .long .Lefi_dll_characteristics_ex - .L_head // FileOffset +#endif + .set .Lefi_debug_table_size, . - .Lefi_debug_table + .previous #endif // Section table @@ -119,33 +157,6 @@ .set .Lsection_count, (. - .Lsection_table) / 40 #ifdef CONFIG_DEBUG_EFI - /* - * The debug table is referenced via its Relative Virtual Address (RVA), - * which is only defined for those parts of the image that are covered - * by a section declaration. Since this header is not covered by any - * section, the debug table must be emitted elsewhere. So stick it in - * the .init.rodata section instead. - * - * Note that the EFI debug entry itself may legally have a zero RVA, - * which means we can simply put it right after the section headers. - */ - __INITRODATA - - .align 2 -.Lefi_debug_table: - // EFI_IMAGE_DEBUG_DIRECTORY_ENTRY - .long 0 // Characteristics - .long 0 // TimeDateStamp - .short 0 // MajorVersion - .short 0 // MinorVersion - .long IMAGE_DEBUG_TYPE_CODEVIEW // Type - .long .Lefi_debug_entry_size // SizeOfData - .long 0 // RVA - .long .Lefi_debug_entry - .L_head // FileOffset - - .set .Lefi_debug_table_size, . - .Lefi_debug_table - .previous - .Lefi_debug_entry: // EFI_IMAGE_DEBUG_CODEVIEW_NB10_ENTRY .ascii "NB10" // Signature @@ -157,6 +168,10 @@ .set .Lefi_debug_entry_size, . - .Lefi_debug_entry #endif +#ifdef CONFIG_ARM64_BTI_KERNEL +.Lefi_dll_characteristics_ex: + .long IMAGE_DLLCHARACTERISTICS_EX_FORWARD_CFI_COMPAT +#endif .balign SEGMENT_ALIGN .Lefi_header_end: diff --git a/drivers/firmware/efi/libstub/Makefile b/drivers/firmware/efi/libstub/Makefile index 80d85a5169fb2c72..3abb2b357482a416 100644 --- a/drivers/firmware/efi/libstub/Makefile +++ b/drivers/firmware/efi/libstub/Makefile @@ -23,8 +23,7 @@ cflags-$(CONFIG_X86) += -m$(BITS) -D__KERNEL__ \ # arm64 uses the full KBUILD_CFLAGS so it's necessary to explicitly # disable the stackleak plugin cflags-$(CONFIG_ARM64) += -fpie $(DISABLE_STACKLEAK_PLUGIN) \ - -fno-unwind-tables -fno-asynchronous-unwind-tables \ - $(call cc-option,-mbranch-protection=none) + -fno-unwind-tables -fno-asynchronous-unwind-tables cflags-$(CONFIG_ARM) += -DEFI_HAVE_STRLEN -DEFI_HAVE_STRNLEN \ -DEFI_HAVE_MEMCHR -DEFI_HAVE_STRRCHR \ -DEFI_HAVE_STRCMP -fno-builtin -fpic \