From owner-freebsd-current@FreeBSD.ORG Sat Jan 19 15:42:42 2008 Return-Path: Delivered-To: freebsd-current@FreeBSD.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id 2A73616A41B; Sat, 19 Jan 2008 15:42:42 +0000 (UTC) (envelope-from rwatson@FreeBSD.org) Received: from cyrus.watson.org (cyrus.watson.org [209.31.154.42]) by mx1.freebsd.org (Postfix) with ESMTP id BE13913C458; Sat, 19 Jan 2008 15:42:41 +0000 (UTC) (envelope-from rwatson@FreeBSD.org) Received: from fledge.watson.org (fledge.watson.org [209.31.154.41]) by cyrus.watson.org (Postfix) with ESMTP id 5074E46D1E; Sat, 19 Jan 2008 10:42:41 -0500 (EST) Date: Sat, 19 Jan 2008 15:42:41 +0000 (GMT) From: Robert Watson X-X-Sender: robert@fledge.watson.org To: Alfred Perlstein In-Reply-To: <20080119122657.GN99258@elvis.mu.org> Message-ID: <20080119154147.E91115@fledge.watson.org> References: <200801181217.52788.jkim@FreeBSD.org> <20080119122657.GN99258@elvis.mu.org> MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII; format=flowed Cc: freebsd-current@FreeBSD.org, Jung-uk Kim , freebsd-arch@FreeBSD.org Subject: Re: [RFC] SysV SHM on 64-bit platforms X-BeenThere: freebsd-current@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Discussions about the use of FreeBSD-current List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sat, 19 Jan 2008 15:42:42 -0000 On Sat, 19 Jan 2008, Alfred Perlstein wrote: >> FYI, fixing ipc_perm is a lot more complicated and very intrusive. > > Why does ipc_perm need fixing? It is desparately broken due to using 16-bit types for uids and gids. Fixing it really tears up the ABI, unfortunately, and requires quite a bit of compat code writing. When there, there are some other types in ipc_perm that would also like to be fixed. Robert N M Watson Computer Laboratory University of Cambridge