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=-14.8 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, MENTIONS_GIT_HOSTING,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED, USER_AGENT_GIT 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 974A3C76191 for ; Wed, 24 Jul 2019 20:02:30 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 6DA7A2147A for ; Wed, 24 Jul 2019 20:02:30 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1563998550; bh=W+A3HzL8frahF/4NuTWlyBvv3yQCjtHeV+jsA0nVNHg=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=P5EebJu8E12iIobq3b4DcxRggxtkyMb4KxpfJk+Dt5hVd44BwuPyPXIFlTggpx/gX 9S+RWUWfaAWoyRnaPvsza/ztR3J8iwcil5AmOWG94CKCA/zhKf9xkOfl6P1Wp9iy7c QE8ZOIT8ErBbrVWT3YCb68rdcYEXdN5Oz2CmsU+A= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2405235AbfGXUC3 (ORCPT ); Wed, 24 Jul 2019 16:02:29 -0400 Received: from mail.kernel.org ([198.145.29.99]:52110 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2392243AbfGXUCY (ORCPT ); Wed, 24 Jul 2019 16:02:24 -0400 Received: from localhost (83-86-89-107.cable.dynamic.v4.ziggo.nl [83.86.89.107]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id CA4CB206BA; Wed, 24 Jul 2019 20:02:22 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1563998543; bh=W+A3HzL8frahF/4NuTWlyBvv3yQCjtHeV+jsA0nVNHg=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=yWP18rkb9N4gb/iOe0jPgbN5qGtfnqeq8nzBsbEFIeZct0pi5f5QA8AH7ONNOboeJ CMuSPZpSnZJYDqf5+5SJ6qz1LzokX3f26+HU1dL1wkaLuIBWhhLRkXyFsjyctb8vQf Tdvc6dLtrB8+BjA5Gq/KiHeXqTEAkY9g8+6Fujcc= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Ard Biesheuvel , Fangrui Song , Nathan Chancellor , Will Deacon , Sasha Levin , Peter Smith Subject: [PATCH 4.19 003/271] arm64/efi: Mark __efistub_stext_offset as an absolute symbol explicitly Date: Wed, 24 Jul 2019 21:17:52 +0200 Message-Id: <20190724191655.533901343@linuxfoundation.org> X-Mailer: git-send-email 2.22.0 In-Reply-To: <20190724191655.268628197@linuxfoundation.org> References: <20190724191655.268628197@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org [ Upstream commit aa69fb62bea15126e744af2e02acc0d6cf3ed4da ] After r363059 and r363928 in LLVM, a build using ld.lld as the linker with CONFIG_RANDOMIZE_BASE enabled fails like so: ld.lld: error: relocation R_AARCH64_ABS32 cannot be used against symbol __efistub_stext_offset; recompile with -fPIC Fangrui and Peter figured out that ld.lld is incorrectly considering __efistub_stext_offset as a relative symbol because of the order in which symbols are evaluated. _text is treated as an absolute symbol and stext is a relative symbol, making __efistub_stext_offset a relative symbol. Adding ABSOLUTE will force ld.lld to evalute this expression in the right context and does not change ld.bfd's behavior. ld.lld will need to be fixed but the developers do not see a quick or simple fix without some research (see the linked issue for further explanation). Add this simple workaround so that ld.lld can continue to link kernels. Link: https://github.com/ClangBuiltLinux/linux/issues/561 Link: https://github.com/llvm/llvm-project/commit/025a815d75d2356f2944136269aa5874721ec236 Link: https://github.com/llvm/llvm-project/commit/249fde85832c33f8b06c6b4ac65d1c4b96d23b83 Acked-by: Ard Biesheuvel Debugged-by: Fangrui Song Debugged-by: Peter Smith Suggested-by: Fangrui Song Signed-off-by: Nathan Chancellor [will: add comment] Signed-off-by: Will Deacon Signed-off-by: Sasha Levin --- arch/arm64/kernel/image.h | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-) diff --git a/arch/arm64/kernel/image.h b/arch/arm64/kernel/image.h index 8da289dc843a..eff6a564ab80 100644 --- a/arch/arm64/kernel/image.h +++ b/arch/arm64/kernel/image.h @@ -73,7 +73,11 @@ #ifdef CONFIG_EFI -__efistub_stext_offset = stext - _text; +/* + * Use ABSOLUTE() to avoid ld.lld treating this as a relative symbol: + * https://github.com/ClangBuiltLinux/linux/issues/561 + */ +__efistub_stext_offset = ABSOLUTE(stext - _text); /* * The EFI stub has its own symbol namespace prefixed by __efistub_, to -- 2.20.1