From patchwork Mon Dec 26 18:45:37 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Masahiro Yamada X-Patchwork-Id: 13081926 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 092D3C4167B for ; Mon, 26 Dec 2022 18:47:29 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:MIME-Version:Message-Id:Date:Subject:Cc :To:From:Reply-To:Content-ID:Content-Description:Resent-Date:Resent-From: Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:In-Reply-To:References: List-Owner; bh=xd/S6EFNmYt1GIRbI2C1SLYkJdFakZ2KMhKEWx1wdzI=; b=Y5zgKrLVa1Ghvm Wos+ga4mG9retgUeQVxUB9hP+4q1xWqlBATy85czlImEdeJ6CiJsvclMYs/D4jHxNDy32B+kXBJG7 6UKXrV8KqY/SKU4Q2ACWGV0+IvCwT43V3hi4amV7MTXukQBZ95j7efNBR3ZG62dIXobYfqkkJ6w3C uh9TU9Ahgmb4tAVO2cMy/N1HIm7XR0X30y0btCq0EMVNjnDj5pr6hMG/w/nhxflm5Nn2M/9xUK52W fYgtrfpLIFW5+MTVc0ES6nKDSN0RucFdJp31q3EC/uea3jC6P0JEJwHvXdTzC0lxmprPeW7GEeSnE ZGqEfIKRz7qvCfiV7f8g==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.94.2 #2 (Red Hat Linux)) id 1p9sUH-006Qgo-I2; Mon, 26 Dec 2022 18:46:13 +0000 Received: from dfw.source.kernel.org ([139.178.84.217]) by bombadil.infradead.org with esmtps (Exim 4.94.2 #2 (Red Hat Linux)) id 1p9sU9-006Qds-0c; Mon, 26 Dec 2022 18:46:06 +0000 Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by dfw.source.kernel.org (Postfix) with ESMTPS id 320F560ECD; Mon, 26 Dec 2022 18:46:02 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 1C8DDC433EF; Mon, 26 Dec 2022 18:45:57 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1672080361; bh=11fqsHGDwlwZxXJ1I41qluVDDxZF3poiwCovlkcoHk8=; h=From:To:Cc:Subject:Date:From; b=FYKcKWr0aibziaNfZxLDzsqJAbxmWqPqNL9fzxTN/GiM2Es+IyAru6i78RMDQBZLE AJUFihUysrNIL0HrQ7zpLpvvkdPgE0VYc5vBp4fKBFnNNQlMhrbm00lvDfpgtSLKKg eim1FHPTBoPExSY3hwYvEfmjXyOtt1Dj67HK9QqTjVJo+p9qc5cgbAewgJVrZCOzT4 0tHVbx22psxKKIAqN+WZbenpOIcf+3onOeOwXutik0uK8+veuaP18Ac4NPX6bRlKWt SyA2x9mAeRdasCG3zdQ0tBnmM0ej0+jVoZ/9M/lHcope8kbXIpFPT6m44J+tUvdMjC F/6LEe+RzHNJg== From: Masahiro Yamada To: linux-arch@vger.kernel.org, linux-kbuild@vger.kernel.org Cc: linux-kernel@vger.kernel.org, Ard Biesheuvel , Thorsten Leemhuis , Catalin Marinas , Will Deacon , linux-arm-kernel@lists.infradead.org, linux-riscv@lists.infradead.org, Dennis Gilmore , Albert Ou , Arnd Bergmann , Jisheng Zhang , Nicolas Schier , Palmer Dabbelt , Paul Walmsley , Masahiro Yamada Subject: [PATCH v2] arch: fix broken BuildID for arm64 and riscv Date: Tue, 27 Dec 2022 03:45:37 +0900 Message-Id: <20221226184537.744960-1-masahiroy@kernel.org> X-Mailer: git-send-email 2.34.1 MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20221226_104605_139184_9149A7A1 X-CRM114-Status: GOOD ( 13.72 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org Dennis Gilmore reports that the BuildID is missing in the arm64 vmlinux since commit 994b7ac1697b ("arm64: remove special treatment for the link order of head.o"). The issue is that the type of .notes section, which contains the BuildID, changed from NOTES to PROGBITS. Ard Biesheuvel figured out that whichever object gets linked first gets to decide the type of a section. The PROGBITS type is the result of the compiler emitting .note.GNU-stack as PROGBITS rather than NOTE. While Ard provided a fix for arm64, I want to fix this globally because the same issue is happening on riscv since commit 2348e6bf4421 ("riscv: remove special treatment for the link order of head.o"). This problem will happen in general for other architectures if they start to drop unneeded entries from scripts/head-object-list.txt. Discard .note.GNU-stack in include/asm-generic/vmlinux.lds.h. Link: https://lore.kernel.org/lkml/CAABkxwuQoz1CTbyb57n0ZX65eSYiTonFCU8-LCQc=74D=xE=rA@mail.gmail.com/ Fixes: 994b7ac1697b ("arm64: remove special treatment for the link order of head.o") Fixes: 2348e6bf4421 ("riscv: remove special treatment for the link order of head.o") Reported-by: Dennis Gilmore Suggested-by: Ard Biesheuvel Signed-off-by: Masahiro Yamada Acked-by: Palmer Dabbelt --- Changes in v2: - discard .note.GNU-stack before .notes because many architectures call DISCARDS at the end of their linker scripts include/asm-generic/vmlinux.lds.h | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/include/asm-generic/vmlinux.lds.h b/include/asm-generic/vmlinux.lds.h index a94219e9916f..659bf3b31c91 100644 --- a/include/asm-generic/vmlinux.lds.h +++ b/include/asm-generic/vmlinux.lds.h @@ -891,7 +891,12 @@ #define PRINTK_INDEX #endif +/* + * Discard .note.GNU-stack, which is emitted as PROGBITS by the compiler. + * Otherwise, the type of .notes section would become PROGBITS instead of NOTES. + */ #define NOTES \ + /DISCARD/ : { *(.note.GNU-stack) } \ .notes : AT(ADDR(.notes) - LOAD_OFFSET) { \ BOUNDED_SECTION_BY(.note.*, _notes) \ } NOTES_HEADERS \