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=-4.1 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,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 86E8FC433E4 for ; Fri, 24 Jul 2020 19:59:56 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 5CC6C206F0 for ; Fri, 24 Jul 2020 19:59:56 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="SW92s/n0" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726676AbgGXT74 (ORCPT ); Fri, 24 Jul 2020 15:59:56 -0400 Received: from us-smtp-1.mimecast.com ([205.139.110.61]:27637 "EHLO us-smtp-delivery-1.mimecast.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1726652AbgGXT7z (ORCPT ); Fri, 24 Jul 2020 15:59:55 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1595620794; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: in-reply-to:in-reply-to:references:references; bh=5Y8DAU+5pPrSS4jiBjfZlFxrk4Ru03nSwBoI5HcfmaE=; b=SW92s/n04ZFXZGKc7YHSxEMQT/21vjCt5/CF+3nNHWEWGCWpSlvHuXmbnKliRpsIf8sN4O z2hHA0vkzmaeeJdLCCQWr81cbAwHSzKIFAJwx2ACnvPUSmqSHAs3rWv3DnLcUeuVln2mTv iHUfc24hcZLpRcHpnvvtFvll5jJ5TeY= Received: from mimecast-mx01.redhat.com (mimecast-mx01.redhat.com [209.132.183.4]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-192-vs8mvubXOWuU2pZDAJAw5A-1; Fri, 24 Jul 2020 15:59:51 -0400 X-MC-Unique: vs8mvubXOWuU2pZDAJAw5A-1 Received: from smtp.corp.redhat.com (int-mx03.intmail.prod.int.phx2.redhat.com [10.5.11.13]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id D9D88800688; Fri, 24 Jul 2020 19:59:48 +0000 (UTC) Received: from warthog.procyon.org.uk (ovpn-112-32.rdu2.redhat.com [10.10.112.32]) by smtp.corp.redhat.com (Postfix) with ESMTP id 37E9F76210; Fri, 24 Jul 2020 19:59:46 +0000 (UTC) Organization: Red Hat UK Ltd. Registered Address: Red Hat UK Ltd, Amberley Place, 107-111 Peascod Street, Windsor, Berkshire, SI4 1TE, United Kingdom. Registered in England and Wales under Company Registration No. 3798903 From: David Howells In-Reply-To: References: <159559628247.2141315.2107013106060144287.stgit@warthog.procyon.org.uk> <159559630912.2141315.16186899692832741137.stgit@warthog.procyon.org.uk> To: Linus Torvalds Cc: dhowells@redhat.com, Al Viro , Casey Schaufler , Stephen Smalley , Nicolas Dichtel , Ian Kent , Christian Brauner , Jeff Layton , Karel Zak , Miklos Szeredi , Linux API , linux-fsdevel , LSM List , Linux Kernel Mailing List Subject: Re: [PATCH 3/4] watch_queue: Implement mount topology and attribute change notifications MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-ID: <2189055.1595620785.1@warthog.procyon.org.uk> Date: Fri, 24 Jul 2020 20:59:45 +0100 Message-ID: <2189056.1595620785@warthog.procyon.org.uk> X-Scanned-By: MIMEDefang 2.79 on 10.5.11.13 Sender: owner-linux-security-module@vger.kernel.org Precedence: bulk List-ID: Linus Torvalds wrote: > So now you can basically allocate as much kernel memory as you want as > a regular user, as long as you have a mounted directory you can walk > (ie everybody). > > Is there any limiting of watches anywhere? I don't see it. That's a good point. Any suggestions on how to do it? An additional RLIMIT? Or should I do it like I did with keyrings and separately manage a quota for each user? David