Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932653AbXINO5x (ORCPT ); Fri, 14 Sep 2007 10:57:53 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1751923AbXINO5p (ORCPT ); Fri, 14 Sep 2007 10:57:45 -0400 Received: from mailhub.sw.ru ([195.214.233.200]:24888 "EHLO relay.sw.ru" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751398AbXINO5p (ORCPT ); Fri, 14 Sep 2007 10:57:45 -0400 Date: Fri, 14 Sep 2007 18:57:30 +0400 From: Alexey Dobriyan To: akpm@osdl.org Cc: linux-kernel@vger.kernel.org, devel@openvz.org Subject: [PATCH] Fix UTS corruption during clone(CLONE_NEWUTS) Message-ID: <20070914145730.GB27986@localhost.sw.ru> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline User-Agent: Mutt/1.5.11 Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1351 Lines: 49 struct utsname is copied from master one without any exclusion. Here is sample output from one proggie doing sethostname("aaaaaaaaaaaaaaaaaaaaaaaaaaaaaa"); sethostname("bbbbbbbbbbbbbbbbbbbbbbbbbbbbbb"); and another clone(,, CLONE_NEWUTS, ...) uname() hostname = 'aaaaaaaaaaaaaaaaaaaaaaaaabbbbb' hostname = 'bbbaaaaaaaaaaaaaaaaaaaaaaaaaaa' hostname = 'aaaaaaaabbbbbbbbbbbbbbbbbbbbbb' hostname = 'aaaaaaaaaaaaaaaaaaaaaaaaaabbbb' hostname = 'aaaaaaaaaaaaaaaaaaaaaaaaaaaabb' hostname = 'aaabbbbbbbbbbbbbbbbbbbbbbbbbbb' hostname = 'bbbbbbbbbbbbbbbbaaaaaaaaaaaaaa' Hostname is sometimes corrupted. Yes, even _the_ simplest namespace activity had bug in it. :-( Signed-off-by: Alexey Dobriyan --- kernel/utsname.c | 2 ++ 1 file changed, 2 insertions(+) --- a/kernel/utsname.c +++ b/kernel/utsname.c @@ -28,7 +28,9 @@ static struct uts_namespace *clone_uts_ns(struct uts_namespace *old_ns) if (!ns) return ERR_PTR(-ENOMEM); + down_read(&uts_sem); memcpy(&ns->name, &old_ns->name, sizeof(ns->name)); + up_read(&uts_sem); kref_init(&ns->kref); return ns; } - 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/