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=-26.3 required=3.0 tests=BAYES_00,DKIMWL_WL_MED, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER,INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, URIBL_BLOCKED,USER_AGENT_GIT,USER_IN_DEF_DKIM_WL 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 CC5BCC1B0D8 for ; Thu, 17 Dec 2020 00:42:03 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 908B12376E for ; Thu, 17 Dec 2020 00:42:03 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726573AbgLQAls (ORCPT ); Wed, 16 Dec 2020 19:41:48 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:50194 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725871AbgLQAlr (ORCPT ); Wed, 16 Dec 2020 19:41:47 -0500 Received: from mail-yb1-xb49.google.com (mail-yb1-xb49.google.com [IPv6:2607:f8b0:4864:20::b49]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id EA8E6C0617A6 for ; Wed, 16 Dec 2020 16:41:06 -0800 (PST) Received: by mail-yb1-xb49.google.com with SMTP id z62so32540522yba.23 for ; Wed, 16 Dec 2020 16:41:06 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20161025; h=sender:date:in-reply-to:message-id:mime-version:references:subject :from:to:cc:content-transfer-encoding; bh=nQgcH8JHZsnhKqD6NfgVnumKz059kSgcZknDGcmmB+s=; b=EPE7cvqG1CwG1U3Og2cZeOASwzVU7A+l3tQlQ2Q1Qj+umQaGHp3C5Fzz5bGK0Crd04 /n0YTZKkbnJr55TZON2xRNoUuFq97eIpqlag40vlkNDS9th2edu7BRoJnTUF+LPOl8rU 5QaH44QM+D7Kwn3CKIxtIUPM9XYOv/kqIUwu885gR114fRktV2zSCPew4FsWlE4Rnrqj Sef/7Zkk91vRjq1xBxnjAM/t8D+kC9wSde//oqYHh2BBIY2f/0vJh1lY1ypqnmuM7/Hi +/2Bf97sUoUrVjttz+wvnStPfEKtpMxMUPz5lBve+Tqg6wmZ2Ta5IY6wJaVGLQbdGFHN YyZQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:sender:date:in-reply-to:message-id:mime-version :references:subject:from:to:cc:content-transfer-encoding; bh=nQgcH8JHZsnhKqD6NfgVnumKz059kSgcZknDGcmmB+s=; b=A59oayArtaTLEWiOUH3Rz8sHJojJIXB2XW9F/8XffF/tHlGM8jqAmUDlYcBdTlnTqV kk4BQj2vjKcRpRZUVcZu5d3y7FedewH1hEfrhlM/gNoulCaA9GFqCeTv0+ZlT6PqUxLt ESd2XQmKX60daOOX+49SIsgQjLTKruqn/MbLfRr44boUByAyuSq+vLYl4LQymvmUIqAa VwGvy3O3BLk0cnhnfeELY2zuZqAsMIIkH9penhKyVC4UkdH74vzykYKxYHbL81kFl+4g /MCEVKfG1Ma8YaiKUqQr+9bKLQaCukuYQW3HoEI12nxfbLoT6RjzA4gv78y7xlZIanZQ UlWg== X-Gm-Message-State: AOAM533l6NOM13GghF96e6p6HXFkKuU3p2VyCvkUOmIpNwNoj/X5BZrx Te25k3f/fvUjwrqlf6B9N1Ce4CgU3EJnfalOYK4= X-Google-Smtp-Source: ABdhPJzDCsUbB7yanWIFRkse1AcPCUp2lzaL4KZ94TktWtsEANgAnit5Tri5D+L2KDcRYZoHWgMFew1sqgzoawDx0kU= Sender: "ndesaulniers via sendgmr" X-Received: from ndesaulniers1.mtv.corp.google.com ([2620:15c:211:202:f693:9fff:fef4:4d25]) (user=ndesaulniers job=sendgmr) by 2002:a25:ed7:: with SMTP id 206mr50304845ybo.136.1608165666117; Wed, 16 Dec 2020 16:41:06 -0800 (PST) Date: Wed, 16 Dec 2020 16:40:51 -0800 In-Reply-To: Message-Id: <20201217004051.1247544-1-ndesaulniers@google.com> Mime-Version: 1.0 References: X-Mailer: git-send-email 2.29.2.684.gfbc64c5ab5-goog Subject: [PATCH] arm64: link with -z norelro for LLD or aarch64-elf From: Nick Desaulniers To: Catalin Marinas , Will Deacon Cc: kernel-team , Peter Smith , clang-built-linux , stable , Ard Biesheuvel , "=?UTF-8?q?F=C4=81ng-ru=C3=AC=20S=C3=B2ng?=" , Quentin Perret , Alan Modra , Nick Desaulniers , "kernelci . org bot" , linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org With newer GNU binutils, 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 relocation types, 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=3Darm64 kernel prefers -maarch64elf, but may fall back to -maarch64linux based on the toolchain configuration. LLD will always create RELRO relocation types 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: Ard Biesheuvel Cc: F=C4=81ng-ru=C3=AC S=C3=B2ng Fixes: 3b92fa7485eb ("arm64: link with -z norelro regardless of CONFIG_RELO= CATABLE") Reported-by: kernelci.org bot Reported-by: Quentin Perret Signed-off-by: Nick Desaulniers --- 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 =20 -LDFLAGS_vmlinux :=3D--no-undefined -X -z norelro +LDFLAGS_vmlinux :=3D--no-undefined -X =20 ifeq ($(CONFIG_RELOCATABLE), y) # Pass --no-apply-dynamic-relocs to restore pre-binutils-2.27 behaviour @@ -115,16 +115,20 @@ KBUILD_CPPFLAGS +=3D -mbig-endian CHECKFLAGS +=3D -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 +=3D -EB $(call ld-option, -maarch64elfb, -maarch64linuxb) +KBUILD_LDFLAGS +=3D -EB $(call ld-option, -maarch64elfb, -maarch64linuxb -= z norelro) UTS_MACHINE :=3D aarch64_be else KBUILD_CPPFLAGS +=3D -mlittle-endian CHECKFLAGS +=3D -D__AARCH64EL__ # Same as above, prefer ELF but fall back to linux target if needed. -KBUILD_LDFLAGS +=3D -EL $(call ld-option, -maarch64elf, -maarch64linux) +KBUILD_LDFLAGS +=3D -EL $(call ld-option, -maarch64elf, -maarch64linux -z = norelro) UTS_MACHINE :=3D aarch64 endif =20 +ifeq ($(CONFIG_LD_IS_LLD), y) +KBUILD_LDFLAGS +=3D -z norelro +endif + CHECKFLAGS +=3D -D__aarch64__ =20 ifeq ($(CONFIG_DYNAMIC_FTRACE_WITH_REGS),y) --=20 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=-16.8 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_ADSP_CUSTOM_MED,DKIM_SIGNED,DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER,INCLUDES_PATCH,MAILING_LIST_MULTI,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 F1A13C4361B for ; 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Wed, 16 Dec 2020 16:41:06 -0800 (PST) Date: Wed, 16 Dec 2020 16:40:51 -0800 In-Reply-To: Message-Id: <20201217004051.1247544-1-ndesaulniers@google.com> Mime-Version: 1.0 References: X-Mailer: git-send-email 2.29.2.684.gfbc64c5ab5-goog Subject: [PATCH] arm64: link with -z norelro for LLD or aarch64-elf From: Nick Desaulniers To: Catalin Marinas , Will Deacon X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20201216_194109_529487_415D2E59 X-CRM114-Status: GOOD ( 11.34 ) 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?q?F=C4=81ng-ru=C3=AC=20S=C3=B2ng?= , Quentin Perret , Alan Modra , Nick Desaulniers , 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; charset="utf-8" Content-Transfer-Encoding: base64 Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org V2l0aCBuZXdlciBHTlUgYmludXRpbHMsIGxpbmtpbmcgd2l0aCBCRkQgcHJvZHVjZXMgd2Fybmlu Z3MgZm9yIHZtbGludXg6CmFhcmNoNjQtbGludXgtZ251LWxkOiB3YXJuaW5nOiAteiBub3JlbHJv IGlnbm9yZWQKCkJGRCBjYW4gcHJvZHVjZSB0aGlzIHdhcm5pbmcgd2hlbiB0aGUgdGFyZ2V0IGVt dWxhdGlvbiBtb2RlIGRvZXMgbm90CnN1cHBvcnQgUkVMUk8gcmVsb2NhdGlvbiB0eXBlcywgYW5k IC16IHJlbHJvIG9yIC16IG5vcmVscm8gaXMgcGFzc2VkLgoKQWxhbiBNb2RyYSBjbGFyaWZpZXM6 CiAgVGhlIGRlZmF1bHQgbGlua2VyIGVtdWxhdGlvbiBmb3IgYW4gYWFyY2g2NC1saW51eCBsZC5i ZmQgaXMKICAtbWFhcmNoNjRsaW51eCwgdGhlIGRlZmF1bHQgZm9yIGFuIGFhcmNoNjQtZWxmIGxp bmtlciBpcwogIC1tYWFyY2g2NGVsZi4gIFRoZXkgYXJlIG5vdCBlcXVpdmFsZW50LiAgSWYgeW91 IGNob29zZSAtbWFhcmNoNjRlbGYKICB5b3UgZ2V0IGFuIGVtdWxhdGlvbiB0aGF0IGRvZXNuJ3Qg c3VwcG9ydCAteiByZWxyby4KClRoZSBBUkNIPWFybTY0IGtlcm5lbCBwcmVmZXJzIC1tYWFyY2g2 NGVsZiwgYnV0IG1heSBmYWxsIGJhY2sgdG8KLW1hYXJjaDY0bGludXggYmFzZWQgb24gdGhlIHRv b2xjaGFpbiBjb25maWd1cmF0aW9uLgoKTExEIHdpbGwgYWx3YXlzIGNyZWF0ZSBSRUxSTyByZWxv Y2F0aW9uIHR5cGVzIHJlZ2FyZGxlc3Mgb2YgdGFyZ2V0CmVtdWxhdGlvbi4KClRvIGF2b2lkIHRo ZSBhYm92ZSB3YXJuaW5nIHdoZW4gbGlua2luZyB3aXRoIEJGRCwgcGFzcyAteiBub3JlbHJvIG9u bHkKd2hlbiBsaW5raW5nIHdpdGggTExEIG9yIHdpdGggLW1hYXJjaDY0bGludXguCgpDYzogQWxh biBNb2RyYSA8YW1vZHJhQGdtYWlsLmNvbT4KQ2M6IEFyZCBCaWVzaGV1dmVsIDxhcmRiQGtlcm5l bC5vcmc+CkNjOiBGxIFuZy1ydcOsIFPDsm5nIDxtYXNrcmF5QGdvb2dsZS5jb20+CkZpeGVzOiAz YjkyZmE3NDg1ZWIgKCJhcm02NDogbGluayB3aXRoIC16IG5vcmVscm8gcmVnYXJkbGVzcyBvZiBD T05GSUdfUkVMT0NBVEFCTEUiKQpSZXBvcnRlZC1ieToga2VybmVsY2kub3JnIGJvdCA8Ym90QGtl cm5lbGNpLm9yZz4KUmVwb3J0ZWQtYnk6IFF1ZW50aW4gUGVycmV0IDxxcGVycmV0QGdvb2dsZS5j b20+ClNpZ25lZC1vZmYtYnk6IE5pY2sgRGVzYXVsbmllcnMgPG5kZXNhdWxuaWVyc0Bnb29nbGUu Y29tPgotLS0KIGFyY2gvYXJtNjQvTWFrZWZpbGUgfCAxMCArKysrKysrLS0tCiAxIGZpbGUgY2hh bmdlZCwgNyBpbnNlcnRpb25zKCspLCAzIGRlbGV0aW9ucygtKQoKZGlmZiAtLWdpdCBhL2FyY2gv YXJtNjQvTWFrZWZpbGUgYi9hcmNoL2FybTY0L01ha2VmaWxlCmluZGV4IDZiZTliMzc1MDI1MC4u OTAzMDkyMDhiYjI4IDEwMDY0NAotLS0gYS9hcmNoL2FybTY0L01ha2VmaWxlCisrKyBiL2FyY2gv YXJtNjQvTWFrZWZpbGUKQEAgLTEwLDcgKzEwLDcgQEAKICMKICMgQ29weXJpZ2h0IChDKSAxOTk1 LTIwMDEgYnkgUnVzc2VsbCBLaW5nCiAKLUxERkxBR1Nfdm1saW51eAk6PS0tbm8tdW5kZWZpbmVk IC1YIC16IG5vcmVscm8KK0xERkxBR1Nfdm1saW51eAk6PS0tbm8tdW5kZWZpbmVkIC1YCiAKIGlm ZXEgKCQoQ09ORklHX1JFTE9DQVRBQkxFKSwgeSkKICMgUGFzcyAtLW5vLWFwcGx5LWR5bmFtaWMt cmVsb2NzIHRvIHJlc3RvcmUgcHJlLWJpbnV0aWxzLTIuMjcgYmVoYXZpb3VyCkBAIC0xMTUsMTYg KzExNSwyMCBAQCBLQlVJTERfQ1BQRkxBR1MJKz0gLW1iaWctZW5kaWFuCiBDSEVDS0ZMQUdTCSs9 IC1EX19BQVJDSDY0RUJfXwogIyBQcmVmZXIgdGhlIGJhcmVtZXRhbCBFTEYgYnVpbGQgdGFyZ2V0 LCBidXQgbm90IGFsbCB0b29sY2hhaW5zIGluY2x1ZGUKICMgaXQgc28gZmFsbCBiYWNrIHRvIHRo ZSBzdGFuZGFyZCBsaW51eCB2ZXJzaW9uIGlmIG5lZWRlZC4KLUtCVUlMRF9MREZMQUdTCSs9IC1F QiAkKGNhbGwgbGQtb3B0aW9uLCAtbWFhcmNoNjRlbGZiLCAtbWFhcmNoNjRsaW51eGIpCitLQlVJ TERfTERGTEFHUwkrPSAtRUIgJChjYWxsIGxkLW9wdGlvbiwgLW1hYXJjaDY0ZWxmYiwgLW1hYXJj aDY0bGludXhiIC16IG5vcmVscm8pCiBVVFNfTUFDSElORQk6PSBhYXJjaDY0X2JlCiBlbHNlCiBL QlVJTERfQ1BQRkxBR1MJKz0gLW1saXR0bGUtZW5kaWFuCiBDSEVDS0ZMQUdTCSs9IC1EX19BQVJD SDY0RUxfXwogIyBTYW1lIGFzIGFib3ZlLCBwcmVmZXIgRUxGIGJ1dCBmYWxsIGJhY2sgdG8gbGlu dXggdGFyZ2V0IGlmIG5lZWRlZC4KLUtCVUlMRF9MREZMQUdTCSs9IC1FTCAkKGNhbGwgbGQtb3B0 aW9uLCAtbWFhcmNoNjRlbGYsIC1tYWFyY2g2NGxpbnV4KQorS0JVSUxEX0xERkxBR1MJKz0gLUVM ICQoY2FsbCBsZC1vcHRpb24sIC1tYWFyY2g2NGVsZiwgLW1hYXJjaDY0bGludXggLXogbm9yZWxy bykKIFVUU19NQUNISU5FCTo9IGFhcmNoNjQKIGVuZGlmCiAKK2lmZXEgKCQoQ09ORklHX0xEX0lT X0xMRCksIHkpCitLQlVJTERfTERGTEFHUwkrPSAteiBub3JlbHJvCitlbmRpZgorCiBDSEVDS0ZM QUdTCSs9IC1EX19hYXJjaDY0X18KIAogaWZlcSAoJChDT05GSUdfRFlOQU1JQ19GVFJBQ0VfV0lU SF9SRUdTKSx5KQotLSAKMi4yOS4yLjY4NC5nZmJjNjRjNWFiNS1nb29nCgoKX19fX19fX19fX19f X19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX18KbGludXgtYXJtLWtlcm5lbCBtYWls aW5nIGxpc3QKbGludXgtYXJtLWtlcm5lbEBsaXN0cy5pbmZyYWRlYWQub3JnCmh0dHA6Ly9saXN0 cy5pbmZyYWRlYWQub3JnL21haWxtYW4vbGlzdGluZm8vbGludXgtYXJtLWtlcm5lbAo=