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=-8.1 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,MAILING_LIST_MULTI,SPF_HELO_NONE, SPF_PASS,USER_AGENT_GIT 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 E13A6C433E1 for ; Thu, 27 Aug 2020 11:46:41 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id BC86D2177B for ; Thu, 27 Aug 2020 11:46:41 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1598528801; bh=dFaCtuuppbrD9PUodVjJhQzg/FVgaLSvUY9+chkC3vQ=; h=From:To:Cc:Subject:Date:List-ID:From; b=JxPpwrQyt4b6Kw35RT2Y6HwaYL/olW36ELB/Umi2GzmlI0o6zpd6juoUdCCJjfDG2 yU9s5Rhf+gZ/OMZ0dj8ig0ko1NjUDPvBbXOM/qzfLIg8u8AvL1h+93XwfQsmYhSKFB 4ujRPZWcahd5LajBLTvSjw9n5fElumOAN/f/DbuI= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728808AbgH0LqU (ORCPT ); Thu, 27 Aug 2020 07:46:20 -0400 Received: from mail.kernel.org ([198.145.29.99]:49376 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728508AbgH0LfY (ORCPT ); Thu, 27 Aug 2020 07:35:24 -0400 Received: from localhost.localdomain (NE2965lan1.rev.em-net.ne.jp [210.141.244.193]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 9FE0722B40; Thu, 27 Aug 2020 11:35:21 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1598528124; bh=dFaCtuuppbrD9PUodVjJhQzg/FVgaLSvUY9+chkC3vQ=; h=From:To:Cc:Subject:Date:From; b=0q/xqTUwqCBVTSHCGZC8EQaC9mJL1umNzRZIgiXqZYnwmOgkvSf8URXxItL3vG1PT oDgXHagGN6pPrkOP6fj/6UAdmWzpiAx+5gSnp0ZSj2gX4NdZgYEId+/rZYp4fAcS7A vRJItWmRmOaRpWDUI+2S6uqAM0L0aYuVNDTDaajg= From: Masami Hiramatsu To: linux-kernel@vger.kernel.org, Peter Zijlstra Cc: Eddy Wu , x86@kernel.org, "David S . Miller" , Steven Rostedt , Ingo Molnar , "Naveen N . Rao" , Anil S Keshavamurthy , linux-arch@vger.kernel.org Subject: [PATCH v2 00/15] kprobes: Unify kretprobe trampoline handlers Date: Thu, 27 Aug 2020 20:35:18 +0900 Message-Id: <159852811819.707944.12798182250041968537.stgit@devnote2> X-Mailer: git-send-email 2.25.1 User-Agent: StGit/0.19 MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi, Here is the 2nd version of the series to unify the kretprobe trampoline handler implementation across all architectures which are currently kprobes supported. Previous version is here; https://lkml.kernel.org/r/159844957216.510284.17683703701627367133.stgit@devnote2 This series removes the in_nmi() check from pre_kretprobe_handler() since we can avoid double-lock deadlock from NMI by kprobe_busy_begin/end(). In this version, I also add a patch to use kfree_rcu() for freeing kretprobe instance objects so that we don't call kfree() in NMI context directly. The unified generic kretprobe trampoline handler is based on x86 code, which already support frame-pointer checker. The checker is enabled on arm and arm64 too because I can test it. For other architecutres, currently the checker is not enabled. If someone wants to enable it, please set the correct frame pointer to ri->fp and pass it to kretprobe_trampoline_handler() as the 3rd parameter, instead of NULL. Thank you, --- Masami Hiramatsu (15): kprobes: Add generic kretprobe trampoline handler x86/kprobes: Use generic kretprobe trampoline handler arm: kprobes: Use generic kretprobe trampoline handler arm64: kprobes: Use generic kretprobe trampoline handler arc: kprobes: Use generic kretprobe trampoline handler csky: kprobes: Use generic kretprobe trampoline handler ia64: kprobes: Use generic kretprobe trampoline handler mips: kprobes: Use generic kretprobe trampoline handler parisc: kprobes: Use generic kretprobe trampoline handler powerpc: kprobes: Use generic kretprobe trampoline handler s390: kprobes: Use generic kretprobe trampoline handler sh: kprobes: Use generic kretprobe trampoline handler sparc: kprobes: Use generic kretprobe trampoline handler kprobes: Remove NMI context check kprobes: Free kretprobe_instance with rcu callback arch/arc/kernel/kprobes.c | 55 +--------------- arch/arm/probes/kprobes/core.c | 79 +---------------------- arch/arm64/kernel/probes/kprobes.c | 79 +---------------------- arch/csky/kernel/probes/kprobes.c | 78 +--------------------- arch/ia64/kernel/kprobes.c | 79 +---------------------- arch/mips/kernel/kprobes.c | 55 +--------------- arch/parisc/kernel/kprobes.c | 78 ++-------------------- arch/powerpc/kernel/kprobes.c | 55 +--------------- arch/s390/kernel/kprobes.c | 81 +---------------------- arch/sh/kernel/kprobes.c | 59 +---------------- arch/sparc/kernel/kprobes.c | 52 +-------------- arch/x86/kernel/kprobes/core.c | 109 +------------------------------ include/linux/kprobes.h | 35 +++++++++- kernel/kprobes.c | 126 +++++++++++++++++++++++++++++------- 14 files changed, 182 insertions(+), 838 deletions(-) -- Masami Hiramatsu (Linaro)