Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S263160AbUDAU7E (ORCPT ); Thu, 1 Apr 2004 15:59:04 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S263165AbUDAU7D (ORCPT ); Thu, 1 Apr 2004 15:59:03 -0500 Received: from e3.ny.us.ibm.com ([32.97.182.103]:50073 "EHLO e3.ny.us.ibm.com") by vger.kernel.org with ESMTP id S263160AbUDAU7B (ORCPT ); Thu, 1 Apr 2004 15:59:01 -0500 Date: Thu, 1 Apr 2004 12:58:50 -0800 (PST) From: Sridhar Samudrala X-X-Sender: sridhar@localhost.localdomain To: Christoph Hellwig cc: linux-kernel@vger.kernel.org Subject: Re: CONFIG_DEBUG_PAGEALLOC and virt_addr_valid() In-Reply-To: <20040401204407.A24608@infradead.org> Message-ID: References: <20040401204407.A24608@infradead.org> MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 961 Lines: 23 On Thu, 1 Apr 2004, Christoph Hellwig wrote: > On Thu, Apr 01, 2004 at 11:11:39AM -0800, Sridhar Samudrala wrote: > > When CONFIG_DEBUG_PAGEALLOC is enabled, i am noticing that virt_addr_valid() > > (called from sctp_is_valid_kaddr()) is returning true even for freed objects. > > Is this a bug or expected behavior? > > Generally every use of virt_addr_valid() is a bug. What are you trying to > do? We are trying to validate a kernel address that is passed by the user. Is there a better way to do that? When an SCTP association is established, the pointer to the association structure is passed to the user as an identifier of the association. This identifier is used in the later calls by the user. -Sridhar - 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/