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=-4.0 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS autolearn=no 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 EEEBFC433E0 for ; Wed, 12 Aug 2020 12:05:57 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id D4663207F7 for ; Wed, 12 Aug 2020 12:05:57 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727858AbgHLMFz (ORCPT ); Wed, 12 Aug 2020 08:05:55 -0400 Received: from pegase1.c-s.fr ([93.17.236.30]:57716 "EHLO pegase1.c-s.fr" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726829AbgHLMFz (ORCPT ); Wed, 12 Aug 2020 08:05:55 -0400 Received: from localhost (mailhub1-int [192.168.12.234]) by localhost (Postfix) with ESMTP id 4BRT1V4tXSzB09ZR; Wed, 12 Aug 2020 14:05:50 +0200 (CEST) X-Virus-Scanned: Debian amavisd-new at c-s.fr Received: from pegase1.c-s.fr ([192.168.12.234]) by localhost (pegase1.c-s.fr [192.168.12.234]) (amavisd-new, port 10024) with ESMTP id Il1RUyWvlQLG; Wed, 12 Aug 2020 14:05:50 +0200 (CEST) Received: from messagerie.si.c-s.fr (messagerie.si.c-s.fr [192.168.25.192]) by pegase1.c-s.fr (Postfix) with ESMTP id 4BRT1V3xygzB09ZQ; Wed, 12 Aug 2020 14:05:50 +0200 (CEST) Received: from localhost (localhost [127.0.0.1]) by messagerie.si.c-s.fr (Postfix) with ESMTP id E5BB58B826; Wed, 12 Aug 2020 14:05:51 +0200 (CEST) X-Virus-Scanned: amavisd-new at c-s.fr Received: from messagerie.si.c-s.fr ([127.0.0.1]) by localhost (messagerie.si.c-s.fr [127.0.0.1]) (amavisd-new, port 10023) with ESMTP id m3Yep6ZUFDWt; Wed, 12 Aug 2020 14:05:51 +0200 (CEST) Received: from po17688vm.idsi0.si.c-s.fr (unknown [192.168.4.90]) by messagerie.si.c-s.fr (Postfix) with ESMTP id B06B18B7FC; Wed, 12 Aug 2020 14:05:51 +0200 (CEST) Received: by po17688vm.idsi0.si.c-s.fr (Postfix, from userid 0) id 74A6A65C34; Wed, 12 Aug 2020 12:05:51 +0000 (UTC) Message-Id: From: Christophe Leroy Subject: [RFC PATCH v1 00/19] powerpc: Switch signal 32 to using user_access_begin() and friends To: Benjamin Herrenschmidt , Paul Mackerras , Michael Ellerman , ldv@altlinux.org, viro@zeniv.linux.org.uk Cc: linux-kernel@vger.kernel.org, linuxppc-dev@lists.ozlabs.org Date: Wed, 12 Aug 2020 12:05:51 +0000 (UTC) Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org This series replaces copies to users by unsafe_put_user() and friends with user_write_access_begin() dance in signal32. The advantages are: - No KUAP unlock/lock at every copy - More readable code. - Better generated code. Copying Al Viro who did it on x86 and may have suggestions, and Dmitry V. Levin who introduced put_compat_sigset() Christophe Leroy (19): powerpc/signal: Move inline functions in signal.h powerpc/ptrace: Move declaration of ptrace_get_reg() and ptrace_set_reg() powerpc/ptrace: Consolidate reg index calculation powerpc/ptrace: Create ptrace_get_fpr() and ptrace_put_fpr() powerpc/signal: Don't manage floating point regs when no FPU powerpc/32s: Allow deselecting CONFIG_PPC_FPU on mpc832x powerpc/signal: Move access_ok() out of get_sigframe() powerpc/signal: Remove get_clean_sp() powerpc/signal: Call get_tm_stackpointer() from get_sigframe() powerpc/signal: Refactor bad frame logging powerpc/signal32: Simplify logging in handle_rt_signal32() powerpc/signal32: Regroup copies in save_user_regs() and save_tm_user_regs() powerpc/signal32: Create 'unsafe' versions of copy_[ck][fpr/vsx]_to_user() powerpc/signal32: Switch save_user_regs() and save_tm_user_regs() to user_access_begin() logic powerpc/signal32: Switch handle_signal32() to user_access_begin() logic powerpc/signal32: Switch handle_rt_signal32() to user_access_begin() logic signal: Add unsafe_put_compat_sigset() powerpc/signal32: Add and use unsafe_put_sigset_t() powerpc/signal32: Switch swap_context() to user_access_begin() logic arch/powerpc/Kconfig | 1 + arch/powerpc/include/asm/processor.h | 16 +- arch/powerpc/include/asm/ptrace.h | 6 - arch/powerpc/kernel/asm-offsets.c | 2 + arch/powerpc/kernel/process.c | 4 + arch/powerpc/kernel/ptrace/Makefile | 3 +- arch/powerpc/kernel/ptrace/ptrace-decl.h | 21 ++ arch/powerpc/kernel/ptrace/ptrace-fpu.c | 40 +++ arch/powerpc/kernel/ptrace/ptrace-view.c | 2 + arch/powerpc/kernel/ptrace/ptrace.c | 54 +--- arch/powerpc/kernel/signal.c | 59 ++-- arch/powerpc/kernel/signal.h | 109 ++++++- arch/powerpc/kernel/signal_32.c | 386 ++++++++++++----------- arch/powerpc/kernel/signal_64.c | 19 +- arch/powerpc/kernel/traps.c | 2 + arch/powerpc/platforms/Kconfig.cputype | 15 +- include/linux/compat.h | 32 ++ 17 files changed, 462 insertions(+), 309 deletions(-) create mode 100644 arch/powerpc/kernel/ptrace/ptrace-fpu.c -- 2.25.0