From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754221AbcLYDNb (ORCPT ); Sat, 24 Dec 2016 22:13:31 -0500 Received: from mail.kernel.org ([198.145.29.136]:43480 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752117AbcLYDNa (ORCPT ); Sat, 24 Dec 2016 22:13:30 -0500 Date: Sun, 25 Dec 2016 12:13:20 +0900 From: Masami Hiramatsu To: Josh Poimboeuf Cc: linux-kernel@vger.kernel.org, x86@kernel.org Subject: Re: Detecting kprobes generated code addresses Message-Id: <20161225121320.b1ee82377e744805ffe47f7f@kernel.org> In-Reply-To: <20161222064219.2urtfm426rv3vtqb@treble> References: <20161222064219.2urtfm426rv3vtqb@treble> X-Mailer: Sylpheed 3.5.0 (GTK+ 2.24.31; x86_64-redhat-linux-gnu) Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Thu, 22 Dec 2016 00:42:19 -0600 Josh Poimboeuf wrote: > Hi Masami, > > I would like to make __kernel_text_address() be able to detect whether > an address belongs to code which was generated by kprobes. As far as I > can tell, that information seems to be in the 'pages' lists of > kprobe_insn_slots and kprobe_optinsn_slots. But they seem to be > protected by mutexes. Right. It is currently under mutex because it may kick page allocation. But I think it is easy to fix that :) > Do you know if there's a sleep-free way to access > that information? Hmm, no, I couldn't find that yet. Thanks, -- Masami Hiramatsu