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=-10.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS 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 8F3A8C433E9 for ; Sun, 10 Jan 2021 11:54:56 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 6243D23B2F for ; Sun, 10 Jan 2021 11:54:56 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726377AbhAJLyk (ORCPT ); Sun, 10 Jan 2021 06:54:40 -0500 Received: from mail-40131.protonmail.ch ([185.70.40.131]:59169 "EHLO mail-40131.protonmail.ch" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726254AbhAJLyj (ORCPT ); Sun, 10 Jan 2021 06:54:39 -0500 Date: Sun, 10 Jan 2021 11:53:50 +0000 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=pm.me; s=protonmail; t=1610279636; bh=e+CceW4cTSMaSiEXVZcdatIqUeP8AJi4B5rdzKiTWXc=; h=Date:To:From:Cc:Reply-To:Subject:From; b=FBoH46m0JJOf+Mn9CgCEuL4rdSIL1n0YXYcAAVT69BLb+xDN7BH68mxBzUtgiOKXB OQYCCc7upTbzvRT4dBDL+Fa8nHH3kYn7rLN/xsyVFkxCTbPc75vWpN9NR9hd9nELkS V/rb0ZpHTYU1UUaqoXuC5diaIqiJHKxamOtdnWuNRWzV4bpI/8ttijqyRtJkDzl/xQ 1/srqKG6F0uvhzx7GsDS5/Xxq9Eqh82KAOlzKZkkx72DjPtCCRrG8jjFFFAgy6w7Oe BqFjT2VnsDtF6tWS88RcW+9j3Pq9Jlc5bLXnoyfNulvbq99PrEGA+qgw1M0W7S1ayl k3YYy74DVPnjw== To: Thomas Bogendoerfer From: Alexander Lobakin Cc: Arnd Bergmann , Nathan Chancellor , Nick Desaulniers , Huacai Chen , Pei Huang , Kees Cook , Alexander Lobakin , Fangrui Song , Jiaxun Yang , Ralf Baechle , Corey Minyard , linux-mips@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arch@vger.kernel.org, stable@vger.kernel.org, clang-built-linux@googlegroups.com Reply-To: Alexander Lobakin Subject: [PATCH v5 mips-next 0/9] MIPS: vmlinux.lds.S sections fixes & cleanup Message-ID: <20210110115245.30762-1-alobakin@pm.me> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org This series hunts the problems discovered after manual enabling of ARCH_WANT_LD_ORPHAN_WARN. Notably: - adds the missing PAGE_ALIGNED_DATA() section affecting VDSO placement (marked for stable); - stops blind catching of orphan text sections with .text.* directive; - properly stops .eh_frame section generation. Compile and runtime tested on MIPS32R2 CPS board with no issues using two different toolkits: - Binutils 2.35.1, GCC 10.2.1 (with Alpine patches); - LLVM stack: 11.0.0 and from latest Git snapshot. Since v4 [3]: - new: drop redundant .text.cps-vec creation and blind inclusion of orphan text sections via .text.* directive in vmlinux.lds.S; - don't assert SIZEOF(.rel.dyn) as it's reported that it may be not empty on certain machines and compilers (Thomas); - align GOT table like it's done for ARM64; - new: catch UBSAN's "unnamed data" sections in generic definitions when building with LD_DEAD_CODE_DATA_ELIMINATION; - collect Reviewed-bys (Kees, Nathan). Since v3 [2]: - fix the third patch as GNU stack emits .rel.dyn into VDSO for some reason if .cfi_sections is specified. Since v2 [1]: - stop discarding .eh_frame and just prevent it from generating (Kees); - drop redundant sections assertions (Fangrui); - place GOT table in .text instead of asserting as it's not empty when building with LLVM (Nathan); - catch compound literals in generic definitions when building with LD_DEAD_CODE_DATA_ELIMINATION (Kees); - collect two Reviewed-bys (Kees). Since v1 [0]: - catch .got entries too as LLD may produce it (Nathan); - check for unwanted sections to be zero-sized instead of discarding (Fangrui). [0] https://lore.kernel.org/linux-mips/20210104121729.46981-1-alobakin@pm.m= e [1] https://lore.kernel.org/linux-mips/20210106200713.31840-1-alobakin@pm.m= e [2] https://lore.kernel.org/linux-mips/20210107115120.281008-1-alobakin@pm.= me [3] https://lore.kernel.org/linux-mips/20210107123331.354075-1-alobakin@pm.= me Alexander Lobakin (9): MIPS: vmlinux.lds.S: add missing PAGE_ALIGNED_DATA() section MIPS: CPS: don't create redundant .text.cps-vec section MIPS: vmlinux.lds.S: add ".gnu.attributes" to DISCARDS MIPS: properly stop .eh_frame generation MIPS: vmlinux.lds.S: explicitly catch .rel.dyn symbols MIPS: vmlinux.lds.S: explicitly declare .got table vmlinux.lds.h: catch compound literals into data and BSS vmlinux.lds.h: catch UBSAN's "unnamed data" into data MIPS: select ARCH_WANT_LD_ORPHAN_WARN arch/mips/Kconfig | 1 + arch/mips/include/asm/asm.h | 18 ++++++++++++++++++ arch/mips/kernel/cps-vec.S | 1 - arch/mips/kernel/vmlinux.lds.S | 11 +++++++++-- include/asm-generic/vmlinux.lds.h | 6 +++--- 5 files changed, 31 insertions(+), 6 deletions(-) --=20 2.30.0