From patchwork Mon Jun 14 10:27:35 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "gregkh@linuxfoundation.org" X-Patchwork-Id: 460398 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=-23.9 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER, INCLUDES_PATCH, MAILING_LIST_MULTI, MENTIONS_GIT_HOSTING, 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 32283C2B9F4 for ; Mon, 14 Jun 2021 10:44:38 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 0C2386188B for ; Mon, 14 Jun 2021 10:44:38 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233740AbhFNKqf (ORCPT ); Mon, 14 Jun 2021 06:46:35 -0400 Received: from mail.kernel.org ([198.145.29.99]:50672 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S234194AbhFNKoc (ORCPT ); Mon, 14 Jun 2021 06:44:32 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id DFCCC61244; Mon, 14 Jun 2021 10:36:19 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1623666980; bh=1l25weUlptaCXdQOOaYRvc5LIiHQ6ncwtcjRGSgx/tA=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=Uwx+Ywaefi+3G78fOhUcZE2n4CLfY4YZwDSBLYfwe2df3RoYfJPOMxCOrNPc85jlm Uep9BA5iog4ghTh7doflg4J59cC8RAhCNj+8zHveSfYhqxCbVCUPkicdoZQUTSjuzb L5alsGEHLO1kHVruhTgtejN46fWG6oxeEbM/rRLU= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, kernel test robot , Nathan Chancellor , Kees Cook , Nick Desaulniers Subject: [PATCH 4.19 52/67] vmlinux.lds.h: Avoid orphan section with !SMP Date: Mon, 14 Jun 2021 12:27:35 +0200 Message-Id: <20210614102645.531386842@linuxfoundation.org> X-Mailer: git-send-email 2.32.0 In-Reply-To: <20210614102643.797691914@linuxfoundation.org> References: <20210614102643.797691914@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Nathan Chancellor commit d4c6399900364facd84c9e35ce1540b6046c345f upstream. With x86_64_defconfig and the following configs, there is an orphan section warning: CONFIG_SMP=n CONFIG_AMD_MEM_ENCRYPT=y CONFIG_HYPERVISOR_GUEST=y CONFIG_KVM=y CONFIG_PARAVIRT=y ld: warning: orphan section `.data..decrypted' from `arch/x86/kernel/cpu/vmware.o' being placed in section `.data..decrypted' ld: warning: orphan section `.data..decrypted' from `arch/x86/kernel/kvm.o' being placed in section `.data..decrypted' These sections are created with DEFINE_PER_CPU_DECRYPTED, which ultimately turns into __PCPU_ATTRS, which in turn has a section attribute with a value of PER_CPU_BASE_SECTION + the section name. When CONFIG_SMP is not set, the base section is .data and that is not currently handled in any linker script. Add .data..decrypted to PERCPU_DECRYPTED_SECTION, which is included in PERCPU_INPUT -> PERCPU_SECTION, which is include in the x86 linker script when either CONFIG_X86_64 or CONFIG_SMP is unset, taking care of the warning. Fixes: ac26963a1175 ("percpu: Introduce DEFINE_PER_CPU_DECRYPTED") Link: https://github.com/ClangBuiltLinux/linux/issues/1360 Reported-by: kernel test robot Signed-off-by: Nathan Chancellor Tested-by: Nick Desaulniers # build Signed-off-by: Kees Cook Link: https://lore.kernel.org/r/20210506001410.1026691-1-nathan@kernel.org Signed-off-by: Greg Kroah-Hartman --- include/asm-generic/vmlinux.lds.h | 1 + 1 file changed, 1 insertion(+) --- a/include/asm-generic/vmlinux.lds.h +++ b/include/asm-generic/vmlinux.lds.h @@ -842,6 +842,7 @@ #ifdef CONFIG_AMD_MEM_ENCRYPT #define PERCPU_DECRYPTED_SECTION \ . = ALIGN(PAGE_SIZE); \ + *(.data..decrypted) \ *(.data..percpu..decrypted) \ . = ALIGN(PAGE_SIZE); #else