From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-11.8 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, MENTIONS_GIT_HOSTING,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 24613C433E0 for ; Fri, 22 May 2020 12:40:43 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id EB895206BE for ; Fri, 22 May 2020 12:40:42 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729719AbgEVMkm (ORCPT ); Fri, 22 May 2020 08:40:42 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:36748 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728717AbgEVMkl (ORCPT ); Fri, 22 May 2020 08:40:41 -0400 Received: from Galois.linutronix.de (Galois.linutronix.de [IPv6:2a0a:51c0:0:12e:550::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 8F506C061A0E; Fri, 22 May 2020 05:40:41 -0700 (PDT) Received: from [5.158.153.53] (helo=tip-bot2.lab.linutronix.de) by Galois.linutronix.de with esmtpsa (TLS1.2:DHE_RSA_AES_256_CBC_SHA256:256) (Exim 4.80) (envelope-from ) id 1jc6yV-00046F-3h; Fri, 22 May 2020 14:40:31 +0200 Received: from [127.0.1.1] (localhost [IPv6:::1]) by tip-bot2.lab.linutronix.de (Postfix) with ESMTP id B42D31C0095; Fri, 22 May 2020 14:40:28 +0200 (CEST) Date: Fri, 22 May 2020 12:40:28 -0000 From: "tip-bot2 for Fangrui Song" Reply-to: linux-kernel@vger.kernel.org To: linux-tip-commits@vger.kernel.org Subject: [tip: x86/build] x86/boot: Discard .discard.unreachable for arch/x86/boot/compressed/vmlinux Cc: kbuild test robot , Fangrui Song , Borislav Petkov , Kees Cook , Arvind Sankar , Sedat Dilek , x86 , LKML In-Reply-To: <20200520182010.242489-1-maskray@google.com> References: <20200520182010.242489-1-maskray@google.com> MIME-Version: 1.0 Message-ID: <159015122855.17951.18280741242752343331.tip-bot2@tip-bot2> X-Mailer: tip-git-log-daemon Robot-ID: Robot-Unsubscribe: Contact to get blacklisted from these emails Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit X-Linutronix-Spam-Score: -1.0 X-Linutronix-Spam-Level: - X-Linutronix-Spam-Status: No , -1.0 points, 5.0 required, ALL_TRUSTED=-1,SHORTCIRCUIT=-0.0001 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org The following commit has been merged into the x86/build branch of tip: Commit-ID: d6ee6529436a15a0541aff6e1697989ee7dc2c44 Gitweb: https://git.kernel.org/tip/d6ee6529436a15a0541aff6e1697989ee7dc2c44 Author: Fangrui Song AuthorDate: Wed, 20 May 2020 11:20:10 -07:00 Committer: Borislav Petkov CommitterDate: Fri, 22 May 2020 12:42:07 +02:00 x86/boot: Discard .discard.unreachable for arch/x86/boot/compressed/vmlinux With commit ce5e3f909fc0 ("efi/printf: Add 64-bit and 8-bit integer support") arch/x86/boot/compressed/vmlinux may have an undesired .discard.unreachable section coming from drivers/firmware/efi/libstub/vsprintf.stub.o. That section gets generated from unreachable() annotations when CONFIG_STACK_VALIDATION is enabled. .discard.unreachable contains an R_X86_64_PC32 relocation which will be warned about by LLD: a non-SHF_ALLOC section (.discard.unreachable) is not part of the memory image, thus conceptually the distance between a non-SHF_ALLOC and a SHF_ALLOC is not a constant which can be resolved at link time: % ld.lld -m elf_x86_64 -T arch/x86/boot/compressed/vmlinux.lds ... -o arch/x86/boot/compressed/vmlinux ld.lld: warning: vsprintf.c:(.discard.unreachable+0x0): has non-ABS relocation R_X86_64_PC32 against symbol '' Reuse the DISCARDS macro which includes .discard.* to drop .discard.unreachable. [ bp: Massage and complete the commit message. ] Reported-by: kbuild test robot Signed-off-by: Fangrui Song Signed-off-by: Borislav Petkov Reviewed-by: Kees Cook Tested-by: Arvind Sankar Tested-by: Sedat Dilek Link: https://lkml.kernel.org/r/20200520182010.242489-1-maskray@google.com --- arch/x86/boot/compressed/vmlinux.lds.S | 2 ++ 1 file changed, 2 insertions(+) diff --git a/arch/x86/boot/compressed/vmlinux.lds.S b/arch/x86/boot/compressed/vmlinux.lds.S index 508cfa6..1031af1 100644 --- a/arch/x86/boot/compressed/vmlinux.lds.S +++ b/arch/x86/boot/compressed/vmlinux.lds.S @@ -73,4 +73,6 @@ SECTIONS #endif . = ALIGN(PAGE_SIZE); /* keep ZO size page aligned */ _end = .; + + DISCARDS }