[patch 15/40] kill sig -1 must only apply to callers namespace

[Greg KH]

2.6.27-stable review patch.  If anyone has any objections, please let us know.

------------------

From: Sukadev Bhattiprolu <sukadev@xxxxxxxxxxxxxxxxxx>

commit d25141a818383b3c3b09f065698c544a7a0ec6e7 upstream.

Currently "kill <sig> -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 <sukadev@xxxxxxxxxxxxxxxxxx>
Acked-by: Eric W. Biederman <ebiederm@xxxxxxxxxxxx>
Tested-by: Daniel Hokka Zakrisson <daniel@xxxxxxxxx>
Signed-off-by: Oleg Nesterov <oleg@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxx>

---
 kernel/signal.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

--- a/kernel/signal.c
+++ b/kernel/signal.c
@@ -1141,7 +1141,8 @@ static int kill_something_info(int sig, 
 		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)

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/