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=-12.7 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED autolearn=unavailable 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 EB147C2BBCD for ; Fri, 18 Dec 2020 02:37:58 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id C11F023A74 for ; Fri, 18 Dec 2020 02:37:58 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1732298AbgLRChn (ORCPT ); Thu, 17 Dec 2020 21:37:43 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:35666 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728578AbgLRChm (ORCPT ); Thu, 17 Dec 2020 21:37:42 -0500 Received: from mail-qt1-x82d.google.com (mail-qt1-x82d.google.com [IPv6:2607:f8b0:4864:20::82d]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 4F703C0617A7; Thu, 17 Dec 2020 18:37:02 -0800 (PST) Received: by mail-qt1-x82d.google.com with SMTP id c14so422635qtn.0; Thu, 17 Dec 2020 18:37:02 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=date:from:to:cc:subject:message-id:references:mime-version :content-disposition:content-transfer-encoding:in-reply-to; bh=eLeNkTbh4DSc6M1hh6DNaHMv8Lj9zN6vPFWfAXZNwaY=; b=mmrDUgHBSjvMD2nn3XQbwAGrHQWS+6MZPQEb1oZn5xg62coWOgcnZ8haMtMJbuZU2e 4lkeS1JlJYnHvKo/FpldtZSEkvhrqx1w7O9qp7pL2tHUEls+Vt53Om///vYe5r6TnWLi 4SUdtI4z+MLe3It0idX+zdDtaCfFO9YMjndydd/zwk7rMX62kihdjXYQ0q1Ux5/euws9 O815K9q93NmfNp+z6AgrXpg04/eXgfMZHbAVN0IFEyUkGknFZChBQRK1/zTqhc5TwXyR HLhMUp3h9A6QEM50kA/2vUbvOrjwIGZB3RF/jpPyeo3jxU0/rBVo8puEx2XkhendX0lW 8STw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:date:from:to:cc:subject:message-id:references :mime-version:content-disposition:content-transfer-encoding :in-reply-to; bh=eLeNkTbh4DSc6M1hh6DNaHMv8Lj9zN6vPFWfAXZNwaY=; b=BzF4CdWaLmBxyARhvgWIvBRLe4NErPqk5xryHSIt8nqco9GfK2pmGrOgI0xMufKkbG Cqksd36kf8beQkMmoL8AiNAfjlisXrDJEb0sgh3BPfNduttobdUhZXlWDi+sOpQTU55g oWswm3z3tOICWQV+Us1g4r5MnA4kTliGz80up2apfDPO+yfapPawUayojGtxtrrXcNRD s4JeEdN+p8nJHrfDQ+s+EksD5EwNDlnddMVXqxAxAS50TPdq39ovpBDny7NJ4QIZPhGg 5JbthYWIGBZpx+pr8HRQbMc+ic6MlexgzhAcysmks/QeCMpdkV1flI7eZi7LVLiJdXH0 xkPA== X-Gm-Message-State: AOAM532GvAwKo5PQbuRZ1vFlseZSB7Uy9IdCXws1FF2Txn7Xw2Ae84FI PIQWwZMcgZK4Oa19vU8Hey4= X-Google-Smtp-Source: ABdhPJxGss/SAuvfMsh8jZ4y8fcmFs98NxJ4B2z3d6gxBRniMhY9u0UP6oGV6EvV+EuPh0kQG32O4Q== X-Received: by 2002:ac8:720c:: with SMTP id a12mr1981900qtp.42.1608259021374; Thu, 17 Dec 2020 18:37:01 -0800 (PST) Received: from ubuntu-m3-large-x86 ([2604:1380:45f1:1d00::1]) by smtp.gmail.com with ESMTPSA id b78sm214183qkg.29.2020.12.17.18.37.00 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 17 Dec 2020 18:37:00 -0800 (PST) Date: Thu, 17 Dec 2020 19:36:58 -0700 From: Nathan Chancellor To: Nick Desaulniers Cc: Catalin Marinas , Will Deacon , kernel-team , Peter Smith , clang-built-linux , stable , Ard Biesheuvel , =?utf-8?B?RsSBbmctcnXDrCBTw7JuZw==?= , Quentin Perret , Alan Modra , "kernelci . org bot" , linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH v2] arm64: link with -z norelro for LLD or aarch64-elf Message-ID: <20201218023658.GA577188@ubuntu-m3-large-x86> References: <20201218002432.788499-1-ndesaulniers@google.com> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: <20201218002432.788499-1-ndesaulniers@google.com> Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Thu, Dec 17, 2020 at 04:24:32PM -0800, 'Nick Desaulniers' via Clang Built Linux wrote: > With GNU binutils 2.35+, linking with BFD produces warnings for vmlinux: > aarch64-linux-gnu-ld: warning: -z norelro ignored > > BFD can produce this warning when the target emulation mode does not > support RELRO program headers, and -z relro or -z norelro is passed. > > Alan Modra clarifies: > The default linker emulation for an aarch64-linux ld.bfd is > -maarch64linux, the default for an aarch64-elf linker is > -maarch64elf. They are not equivalent. If you choose -maarch64elf > you get an emulation that doesn't support -z relro. > > The ARCH=arm64 kernel prefers -maarch64elf, but may fall back to > -maarch64linux based on the toolchain configuration. > > LLD will always create RELRO program header regardless of target > emulation. > > To avoid the above warning when linking with BFD, pass -z norelro only > when linking with LLD or with -maarch64linux. > > Cc: Alan Modra > Cc: Fāng-ruì Sòng > Fixes: 3b92fa7485eb ("arm64: link with -z norelro regardless of CONFIG_RELOCATABLE") > Reported-by: kernelci.org bot > Reported-by: Quentin Perret > Acked-by: Ard Biesheuvel > Signed-off-by: Nick Desaulniers Reviewed-by: Nathan Chancellor > --- > Changes V1 -> V2: > * s/relocation types/program headers/ > * s/newer GNU binutils/GNU binutils 2.35+/ > * Pick up Ard's Ack. > > Note: maintainers may want to pick up the following tag: > > Fixes: 3bbd3db86470 ("arm64: relocatable: fix inconsistencies in linker script and options") > > or drop the existing fixes tag (this patch is more so in response to > change to BFD to warn than fix a kernel regression, IMO, but I don't > care). Either way, it would be good to fix this for the newly minted > v5.10.y. Should probably have Cc: stable@vger.kernel.org then. > I'll probably be offline for the next two weeks for the holidays, so no > promises on quick replies. Happy holidays+new year! > > > arch/arm64/Makefile | 10 +++++++--- > 1 file changed, 7 insertions(+), 3 deletions(-) > > diff --git a/arch/arm64/Makefile b/arch/arm64/Makefile > index 6be9b3750250..90309208bb28 100644 > --- a/arch/arm64/Makefile > +++ b/arch/arm64/Makefile > @@ -10,7 +10,7 @@ > # > # Copyright (C) 1995-2001 by Russell King > > -LDFLAGS_vmlinux :=--no-undefined -X -z norelro > +LDFLAGS_vmlinux :=--no-undefined -X > > ifeq ($(CONFIG_RELOCATABLE), y) > # Pass --no-apply-dynamic-relocs to restore pre-binutils-2.27 behaviour > @@ -115,16 +115,20 @@ KBUILD_CPPFLAGS += -mbig-endian > CHECKFLAGS += -D__AARCH64EB__ > # Prefer the baremetal ELF build target, but not all toolchains include > # it so fall back to the standard linux version if needed. > -KBUILD_LDFLAGS += -EB $(call ld-option, -maarch64elfb, -maarch64linuxb) > +KBUILD_LDFLAGS += -EB $(call ld-option, -maarch64elfb, -maarch64linuxb -z norelro) > UTS_MACHINE := aarch64_be > else > KBUILD_CPPFLAGS += -mlittle-endian > CHECKFLAGS += -D__AARCH64EL__ > # Same as above, prefer ELF but fall back to linux target if needed. > -KBUILD_LDFLAGS += -EL $(call ld-option, -maarch64elf, -maarch64linux) > +KBUILD_LDFLAGS += -EL $(call ld-option, -maarch64elf, -maarch64linux -z norelro) > UTS_MACHINE := aarch64 > endif > > +ifeq ($(CONFIG_LD_IS_LLD), y) > +KBUILD_LDFLAGS += -z norelro > +endif > + > CHECKFLAGS += -D__aarch64__ > > ifeq ($(CONFIG_DYNAMIC_FTRACE_WITH_REGS),y) > -- > 2.29.2.684.gfbc64c5ab5-goog > 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=-10.7 required=3.0 tests=BAYES_00, DKIM_ADSP_CUSTOM_MED,DKIM_SIGNED,DKIM_VALID,FREEMAIL_FORGED_FROMDOMAIN, FREEMAIL_FROM,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER, INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org 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-0700 From: Nathan Chancellor To: Nick Desaulniers Subject: Re: [PATCH v2] arm64: link with -z norelro for LLD or aarch64-elf Message-ID: <20201218023658.GA577188@ubuntu-m3-large-x86> References: <20201218002432.788499-1-ndesaulniers@google.com> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <20201218002432.788499-1-ndesaulniers@google.com> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20201217_213706_131139_5572F415 X-CRM114-Status: GOOD ( 24.81 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: "kernelci . org bot" , =?utf-8?B?RsSBbmctcnXDrCBTw7JuZw==?= , Will Deacon , Quentin Perret , Catalin Marinas , Alan Modra , Peter Smith , stable , linux-kernel@vger.kernel.org, clang-built-linux , kernel-team , Ard Biesheuvel , linux-arm-kernel@lists.infradead.org Content-Type: text/plain; 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