Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754027AbXJIXt0 (ORCPT ); Tue, 9 Oct 2007 19:49:26 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1751409AbXJIXtS (ORCPT ); Tue, 9 Oct 2007 19:49:18 -0400 Received: from balanced.mail.policyd.dreamhost.com ([208.97.132.119]:53203 "EHLO jankymail-a5.dreamhost.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1751300AbXJIXtS convert rfc822-to-8bit (ORCPT ); Tue, 9 Oct 2007 19:49:18 -0400 X-Greylist: delayed 34144 seconds by postgrey-1.27 at vger.kernel.org; Tue, 09 Oct 2007 19:49:17 EDT Date: Tue, 9 Oct 2007 19:48:20 -0400 From: Gustavo Chain To: linux-kernel@vger.kernel.org Subject: [PATCH] Reserve N process to root Message-ID: <20071009194820.6c8d6e8d@0xff.cl> X-Mailer: Claws Mail 3.0.1 (GTK+ 2.10.14; i686-pc-linux-gnu) Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8BIT Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1083 Lines: 39 I think it's necessary to reserve some pids to the super user. 5 must be sufficient. Signed-off-by: Gustavo Chain --- kernel/fork.c | 6 ++++++ 1 files changed, 6 insertions(+), 0 deletions(-) diff --git a/kernel/fork.c b/kernel/fork.c index 33f12f4..db23cb3 100644 --- a/kernel/fork.c +++ b/kernel/fork.c @@ -1367,11 +1367,17 @@ long do_fork(unsigned long clone_flags, int __user *parent_tidptr, int __user *child_tidptr) { +#define RESERVED_PIDS 5 + struct task_struct *p; int trace = 0; struct pid *pid = alloc_pid(); long nr; + if (!capable(CAP_SYS_ADMIN) && nr_threads >= max_threads - RESERVED_PIDS) { + return -EAGAIN; + } + if (!pid) return -EAGAIN; nr = pid->nr; -- Gustavo Chaín Dumit - 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/