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=-0.8 required=3.0 tests=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 6855DC35646 for ; Fri, 21 Feb 2020 15:41:42 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 462C5208E4 for ; Fri, 21 Feb 2020 15:41:42 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728643AbgBUPll convert rfc822-to-8bit (ORCPT ); Fri, 21 Feb 2020 10:41:41 -0500 Received: from eu-smtp-delivery-151.mimecast.com ([207.82.80.151]:21840 "EHLO eu-smtp-delivery-151.mimecast.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728249AbgBUPlk (ORCPT ); Fri, 21 Feb 2020 10:41:40 -0500 Received: from AcuMS.aculab.com (156.67.243.126 [156.67.243.126]) (Using TLS) by relay.mimecast.com with ESMTP id uk-mta-34-znG9C_rnOd---4JYyePm1w-1; Fri, 21 Feb 2020 15:41:36 +0000 X-MC-Unique: znG9C_rnOd---4JYyePm1w-1 Received: from AcuMS.Aculab.com (fd9f:af1c:a25b:0:43c:695e:880f:8750) by AcuMS.aculab.com (fd9f:af1c:a25b:0:43c:695e:880f:8750) with Microsoft SMTP Server (TLS) id 15.0.1347.2; Fri, 21 Feb 2020 15:41:35 +0000 Received: from AcuMS.Aculab.com ([fe80::43c:695e:880f:8750]) by AcuMS.aculab.com ([fe80::43c:695e:880f:8750%12]) with mapi id 15.00.1347.000; Fri, 21 Feb 2020 15:41:35 +0000 From: David Laight To: 'Will Deacon' , "linux-kernel@vger.kernel.org" CC: "kernel-team@android.com" , "akpm@linux-foundation.org" , "K . Prasad" , Thomas Gleixner , "Greg Kroah-Hartman" , Frederic Weisbecker , Christoph Hellwig , Quentin Perret , Alexei Starovoitov , Masami Hiramatsu Subject: RE: [PATCH 0/3] Unexport kallsyms_lookup_name() and kallsyms_on_each_symbol() Thread-Topic: [PATCH 0/3] Unexport kallsyms_lookup_name() and kallsyms_on_each_symbol() Thread-Index: AQHV6Kw/G1ZhChcu+kqJa3R2blwF06glyM6A Date: Fri, 21 Feb 2020 15:41:35 +0000 Message-ID: References: <20200221114404.14641-1-will@kernel.org> In-Reply-To: <20200221114404.14641-1-will@kernel.org> Accept-Language: en-GB, en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-ms-exchange-transport-fromentityheader: Hosted x-originating-ip: [10.202.205.107] MIME-Version: 1.0 X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: aculab.com 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 From: Will Deacon > Sent: 21 February 2020 11:44 > Hi folks, > > Despite having just a single modular in-tree user that I could spot, > kallsyms_lookup_name() is exported to modules and provides a mechanism > for out-of-tree modules to access and invoke arbitrary, non-exported > kernel symbols when kallsyms is enabled. Now where did I put that kernel code that opens /proc/kallsyms and then reads it to find the addresses of symbols ... David - Registered Address Lakeside, Bramley Road, Mount Farm, Milton Keynes, MK1 1PT, UK Registration No: 1397386 (Wales)