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=-7.2 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,NICE_REPLY_A, SPF_HELO_NONE,SPF_PASS,USER_AGENT_SANE_1 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 2456DC433EF for ; Fri, 10 Sep 2021 03:19:11 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 0BF5A610CE for ; Fri, 10 Sep 2021 03:19:11 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229989AbhIJDUU (ORCPT ); Thu, 9 Sep 2021 23:20:20 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:49686 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229862AbhIJDUN (ORCPT ); Thu, 9 Sep 2021 23:20:13 -0400 Received: from mail-pj1-x102e.google.com (mail-pj1-x102e.google.com [IPv6:2607:f8b0:4864:20::102e]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id D936FC061574 for ; Thu, 9 Sep 2021 20:19:02 -0700 (PDT) Received: by mail-pj1-x102e.google.com with SMTP id k23so480613pji.0 for ; Thu, 09 Sep 2021 20:19:02 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=bytedance-com.20150623.gappssmtp.com; s=20150623; h=subject:to:cc:references:from:message-id:date:user-agent :mime-version:in-reply-to:content-transfer-encoding; bh=ZyJ5aJ688YFP5BdUD862ESctJBWAWrpF4LKhAWAYN2g=; b=BY+b79GknjxGwAAgpE5nAVSQyrNZGFlMCFaZG1JeQDak4ZakmRsTeAUTwdH80M2NAY pzQFK36SH1HJ+G1XciQIpWkdD5ueJ/SR1CGWB3/UYkDJfxFfZxpbTBCQgSC1tYsBbW3q SQrC7Id2an/nqfMJkYYuGzUhqX0VvSvdBoCD7P5TfAXuYmYaUz9j9WT9C0+YbpMJUNM/ m+kn6uMxVfJQwuMEFgP1g7xc3c480UmZ/8tJL+EzGgtn8H40DOgDk75W7uAgx3jEzzOH vF8BIWbRi1GfJSlTZMyetDl4cEnD+qwWBYA+CGCcV/Q/5IHtatHcf6+FNPTDQefyximK O5Ig== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:subject:to:cc:references:from:message-id:date :user-agent:mime-version:in-reply-to:content-transfer-encoding; bh=ZyJ5aJ688YFP5BdUD862ESctJBWAWrpF4LKhAWAYN2g=; b=oOUqQ4R8kFq4AamEHVJqvwst+K7QAnXqwi0CoSqYthqD8cV95ytgomgm1aQVzrSKK4 8XGZ9/VCBJxqTfrHUZwO1c40iUexZPhSMZTFghqfFEwQzOa7iNtIOyEUboP5aM31jq36 DAJKiwrZ6gtGY4ebbig0q21tDdXpWwlYi8489PFMLrAauaMEuFiatnffkWsnYq9TkvGs sA7Qe1hkMEBIhw7veiVnEMF1xZlXh0OTxXRxobbeRQyVJ8he73TajsS2TZDj7y4g73Tm PDMc8+NLnO9YrZ+N/x+K6C9PI/UnNQvFo9GZsFv82vM7WoPX1grYCWEMqt/qAUijlju4 +N/Q== X-Gm-Message-State: AOAM5304mkB9kBUzVpBARc75W+5rjpfl0EDrmi/4cFUvRXP2qd/VAXSR iBOcDbXmcdFs4+zKoCqVvjs1aQ== X-Google-Smtp-Source: ABdhPJzt6A1D9lv/BKeUU4b8iyy//L0XSDBEiURXKKdgF//bplhW5cU2qe7bzx0SFrImJHNiSUGGdg== X-Received: by 2002:a17:903:1251:b0:13a:1f5e:20da with SMTP id u17-20020a170903125100b0013a1f5e20damr5760041plh.75.1631243942405; Thu, 09 Sep 2021 20:19:02 -0700 (PDT) Received: from [10.86.116.180] ([139.177.225.230]) by smtp.gmail.com with ESMTPSA id q12sm3488773pfj.153.2021.09.09.20.18.58 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Thu, 09 Sep 2021 20:19:01 -0700 (PDT) Subject: Re: [External] Re: [patch 079/147] fs/proc/kcore.c: add mmap interface To: Linus Torvalds Cc: Andrew Morton , Alexey Dobriyan , chenying.kernel@bytedance.com, Linux-MM , mm-commits@vger.kernel.org, Mike Rapoport , Muchun Song , zhouchengming@bytedance.com, zhengqi.arch@bytedance.com References: <20210907195226.14b1d22a07c085b22968b933@linux-foundation.org> <20210908025730.S88ylmikU%akpm@linux-foundation.org> From: Feng Zhou Message-ID: Date: Fri, 10 Sep 2021 11:18:54 +0800 User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:78.0) Gecko/20100101 Thunderbird/78.14.0 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 8bit Precedence: bulk Reply-To: linux-kernel@vger.kernel.org List-ID: X-Mailing-List: mm-commits@vger.kernel.org 在 2021/9/10 上午1:34, Linus Torvalds 写道: > On Thu, Sep 9, 2021 at 10:32 AM Linus Torvalds > wrote: >> This is basically a very dangerous interface. The fact that it is >> read-only doesn't change that at all. > Just to clarify - we've done dangerous interfaces in the past. We > probably have tons of them still that I haven't even thought about, > and I think I can hear somebody sniggering from miles away about > various bugs that cause much more obvious security holes that I didn't > think of. > > But the fact that we might have other holes that can be misused, > doesn't mean we have to add new ones that seem to be almost designed > for misuse. > > Linus Ok, got it.