From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754984AbZKEFjL (ORCPT ); Thu, 5 Nov 2009 00:39:11 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1754717AbZKEFjJ (ORCPT ); Thu, 5 Nov 2009 00:39:09 -0500 Received: from e1.ny.us.ibm.com ([32.97.182.141]:57958 "EHLO e1.ny.us.ibm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754676AbZKEFjG (ORCPT ); Thu, 5 Nov 2009 00:39:06 -0500 Date: Wed, 4 Nov 2009 21:40:02 -0800 From: Sukadev Bhattiprolu To: linux-kernel@vger.kernel.org Cc: arnd@arndb.de, Containers , "Eric W. Biederman" , hpa@zytor.com, Alexey Dobriyan , roland@redhat.com, Pavel Emelyanov , serue@us.ibm.com, Oren Laadan Subject: [v11][PATCH 6/9] Check invalid clone flags Message-ID: <20091105054002.GF16142@us.ibm.com> References: <20091105053053.GA11289@us.ibm.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20091105053053.GA11289@us.ibm.com> X-Operating-System: Linux 2.0.32 on an i486 User-Agent: Mutt/1.5.18 (2008-05-17) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Sukadev Bhattiprolu Subject: [v11][PATCH 6/9] Check invalid clone flags As pointed out by Oren Laadan, we want to ensure that unused bits in the clone-flags remain unused and available for future. To ensure this, define a mask of clone-flags and check the flags in the clone() system calls. Changelog[v9]: - Include the unused clone-flag (CLONE_UNUSED) to VALID_CLONE_FLAGS to avoid breaking any applications that may have set it. IOW, this patch/check only applies to clone-flags bits 33 and higher. Changelog[v8]: - New patch in set Signed-off-by: Sukadev Bhattiprolu Acked-by: Oren Laadan --- include/linux/sched.h | 12 ++++++++++++ kernel/fork.c | 3 +++ 2 files changed, 15 insertions(+), 0 deletions(-) diff --git a/include/linux/sched.h b/include/linux/sched.h index 75e6e60..6b319a0 100644 --- a/include/linux/sched.h +++ b/include/linux/sched.h @@ -29,6 +29,18 @@ #define CLONE_NEWNET 0x40000000 /* New network namespace */ #define CLONE_IO 0x80000000 /* Clone io context */ +#define CLONE_UNUSED 0x00001000 /* Can be reused ? */ + +#define VALID_CLONE_FLAGS (CSIGNAL | CLONE_VM | CLONE_FS | CLONE_FILES |\ + CLONE_SIGHAND | CLONE_UNUSED | CLONE_PTRACE |\ + CLONE_VFORK | CLONE_PARENT | CLONE_THREAD |\ + CLONE_NEWNS | CLONE_SYSVSEM | CLONE_SETTLS |\ + CLONE_PARENT_SETTID | CLONE_CHILD_CLEARTID |\ + CLONE_DETACHED | CLONE_UNTRACED |\ + CLONE_CHILD_SETTID | CLONE_STOPPED |\ + CLONE_NEWUTS | CLONE_NEWIPC | CLONE_NEWUSER |\ + CLONE_NEWPID | CLONE_NEWNET| CLONE_IO) + /* * Scheduling policies */ diff --git a/kernel/fork.c b/kernel/fork.c index c8a06de..11f77ed 100644 --- a/kernel/fork.c +++ b/kernel/fork.c @@ -982,6 +982,9 @@ static struct task_struct *copy_process(unsigned long clone_flags, struct task_struct *p; int cgroup_callbacks_done = 0; + if (clone_flags & ~VALID_CLONE_FLAGS) + return ERR_PTR(-EINVAL); + if ((clone_flags & (CLONE_NEWNS|CLONE_FS)) == (CLONE_NEWNS|CLONE_FS)) return ERR_PTR(-EINVAL); -- 1.6.0.4