On Tue, Dec 14, 2021 at 04:58:32PM +1100, Balbir Singh wrote:

On Wed, Dec 08, 2021 at 04:33:17PM +0800, Leo Yan wrote:

quoted

This patch replaces open code with task_is_in_init_pid_ns() to check if
a task is in root PID namespace.

Signed-off-by: Leo Yan <redacted>
---
 drivers/connector/cn_proc.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/connector/cn_proc.c b/drivers/connector/cn_proc.c
index 646ad385e490..ccac1c453080 100644
--- a/drivers/connector/cn_proc.c
+++ b/drivers/connector/cn_proc.c

@@ -358,7 +358,7 @@ static void cn_proc_mcast_ctl(struct cn_msg *msg,
 	 * other namespaces.
 	 */
 	if ((current_user_ns() != &init_user_ns) ||
-	    (task_active_pid_ns(current) != &init_pid_ns))
+	    !task_is_in_init_pid_ns(current))
 		return;

Sounds like there might scope for other wrappers - is_current_in_user_init_ns()

Indeed, for new wrapper is_current_in_user_init_ns(), I searched kernel
and located there have multiple places use open code.  If no one works
on this refactoring, I will send a new patchset for it separately.

Acked-by: Balbir Singh <bsingharora@gmail.com>

Thank you for review, Balbir!  Also thanks review from Leon and
Suzuki.

Leo