Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S261843AbVDKRVH (ORCPT ); Mon, 11 Apr 2005 13:21:07 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S261861AbVDKRVH (ORCPT ); Mon, 11 Apr 2005 13:21:07 -0400 Received: from webmail.topspin.com ([12.162.17.3]:7605 "EHLO exch-1.topspincom.com") by vger.kernel.org with ESMTP id S261852AbVDKRUw (ORCPT ); Mon, 11 Apr 2005 13:20:52 -0400 To: Troy Benjegerdes Cc: linux-kernel@vger.kernel.org, openib-general@openib.org Subject: Re: [PATCH][RFC][0/4] InfiniBand userspace verbs implementation X-Message-Flag: Warning: May contain useful information References: <200544159.Ahk9l0puXy39U6u6@topspin.com> <20050411142213.GC26127@kalmia.hozed.org> <52mzs51g5g.fsf@topspin.com> <20050411163342.GE26127@kalmia.hozed.org> From: Roland Dreier Date: Mon, 11 Apr 2005 09:56:53 -0700 In-Reply-To: <20050411163342.GE26127@kalmia.hozed.org> (Troy Benjegerdes's message of "Mon, 11 Apr 2005 11:33:42 -0500") Message-ID: <5264yt1cbu.fsf@topspin.com> User-Agent: Gnus/5.1006 (Gnus v5.10.6) XEmacs/21.4 (Jumbo Shrimp, linux) MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii X-OriginalArrivalTime: 11 Apr 2005 16:56:54.0078 (UTC) FILETIME=[76AAF5E0:01C53EB7] Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 744 Lines: 20 Troy> Is there a check in the kernel that the memory is actually Troy> mlock()ed? No. Troy> What if a malicious (or broken) application does Troy> ibv_reg_mr() but doesn't lock the memory? Does the IB card Troy> get a physical address for a page that might get swapped Troy> out? No, the kernel does get_user_pages(). So the pages that the HCA gets will not be swapped or used for anything else. The only thing a malicious userspace app can do is screw itself up. - R. - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/