From mboxrd@z Thu Jan 1 00:00:00 1970 From: sukadev@linux.vnet.ibm.com Subject: [PATCH] 'kill sig -1' must only apply to caller's namespace Date: Thu, 23 Oct 2008 08:49:28 -0700 Message-ID: <20081023154928.GA1044@us.ibm.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Return-path: Content-Disposition: inline Sender: linux-kernel-owner@vger.kernel.org To: Andrew Morton Cc: Oleg Nesterov , "Eric W. Biederman" , daniel@hozac.com, Pavel Emelyanov , Containers , linux-kernel@vger.kernel.org List-Id: containers.vger.kernel.org From: Sukadev Bhattiprolu Subject: [PATCH] 'kill sig -1' must only apply to caller's namespace Currently "kill -1" kills processes in all namespaces and breaks the isolation of namespaces. Earlier attempt to fix this was discussed at: http://lkml.org/lkml/2008/7/23/148 As suggested by Oleg Nesterov in that thread, use "task_pid_vnr() > 1" check since task_pid_vnr() returns 0 if process is outside the caller's namespace. Signed-off-by: Sukadev Bhattiprolu Acked-by: Eric W. Biederman Tested-by: Daniel Hokka Zakrisson --- kernel/signal.c | 3 ++- 1 files changed, 2 insertions(+), 1 deletions(-) diff --git a/kernel/signal.c b/kernel/signal.c index 105217d..4530fc6 100644 --- a/kernel/signal.c +++ b/kernel/signal.c @@ -1144,7 +1144,8 @@ static int kill_something_info(int sig, struct siginfo *info, pid_t pid) struct task_struct * p; for_each_process(p) { - if (p->pid > 1 && !same_thread_group(p, current)) { + if (task_pid_vnr(p) > 1 && + !same_thread_group(p, current)) { int err = group_send_sig_info(sig, info, p); ++count; if (err != -EPERM) -- 1.5.2.5