From patchwork Tue Oct 25 14:12:39 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Evgeniy Baskov X-Patchwork-Id: 13019322 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 6EDADC38A2D for ; Tue, 25 Oct 2022 14:13:22 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232954AbiJYONV (ORCPT ); Tue, 25 Oct 2022 10:13:21 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:45726 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232627AbiJYONU (ORCPT ); Tue, 25 Oct 2022 10:13:20 -0400 Received: from mail.ispras.ru (mail.ispras.ru [83.149.199.84]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 664F79C2EE; Tue, 25 Oct 2022 07:13:19 -0700 (PDT) Received: from localhost.localdomain (unknown [83.149.199.65]) by mail.ispras.ru (Postfix) with ESMTPSA id DF7AD419E9C1; Tue, 25 Oct 2022 14:13:15 +0000 (UTC) DKIM-Filter: OpenDKIM Filter v2.11.0 mail.ispras.ru DF7AD419E9C1 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=ispras.ru; s=default; t=1666707196; bh=Q9fnWgrDqNAEfbyyDhr1NF2k/eQWdzIJiBg8GZcJcfM=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=YQzgIw4H4258IJy13u2s453qRvWd3gEaFSmUfhIfBnTcPR02DI6f4rRjsryOmM992 bcEZElVn4CDB4tHTuSGZ2yjgnk32eHiZDlNZ37tmt0Y/qZ9ZouwvnnBAupdnDxiumv vEgb/WsHxuTS6TtCOpexu8QvN95m+L1RsHO4mbOM= 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 01/23] x86/boot: Align vmlinuz sections on page size Date: Tue, 25 Oct 2022 17:12:39 +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 protect sections on page table level each section needs to be aligned on page size (4KB). Set sections alignment in linker script. Add _compressed/_ecompressed symbols to access '.rodata..compressed' section content in the same way other sections are accessed. This is useful when applying memory attributes of the section. Signed-off-by: Evgeniy Baskov --- arch/x86/boot/compressed/vmlinux.lds.S | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/arch/x86/boot/compressed/vmlinux.lds.S b/arch/x86/boot/compressed/vmlinux.lds.S index 112b2375d021..6be90f1a1198 100644 --- a/arch/x86/boot/compressed/vmlinux.lds.S +++ b/arch/x86/boot/compressed/vmlinux.lds.S @@ -27,21 +27,27 @@ SECTIONS HEAD_TEXT _ehead = . ; } + . = ALIGN(PAGE_SIZE); .rodata..compressed : { + _compressed = .; *(.rodata..compressed) + _ecompressed = .; } + . = ALIGN(PAGE_SIZE); .text : { _text = .; /* Text */ *(.text) *(.text.*) _etext = . ; } + . = ALIGN(PAGE_SIZE); .rodata : { _rodata = . ; *(.rodata) /* read-only data */ *(.rodata.*) _erodata = . ; } + . = ALIGN(PAGE_SIZE); .data : { _data = . ; *(.data)