linux-kernel - [PATCH 1/4] pid: make __task_pid_nr_ns(ns => NULL) safe for zombie callers

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Message-ID: <20250810173604.GA19991@redhat.com>
Date: Sun, 10 Aug 2025 19:36:04 +0200
From: Oleg Nesterov <oleg@...hat.com>
To: Andrew Morton <akpm@...ux-foundation.org>,
	Christian Brauner <brauner@...nel.org>,
	高翔 <gaoxiang17@...omi.com>
Cc: Al Viro <viro@...iv.linux.org.uk>, Mateusz Guzik <mjguzik@...il.com>,
	Xiang Gao <gxxa03070307@...il.com>, linux-kernel@...r.kernel.org
Subject: [PATCH 1/4] pid: make __task_pid_nr_ns(ns => NULL) safe for zombie
 callers

task_pid_vnr(another_task) will crash if the caller was already reaped.
The pid_alive(current) check can't really help, the parent/debugger can
call release_task() right after this check.

This also means that even task_ppid_nr_ns(current, NULL) is not safe,
pid_alive() only ensures that it is safe to dereference ->real_parent.

Change __task_pid_nr_ns() to ensure ns != NULL.

Originally-by: 高翔 <gaoxiang17@...omi.com>
Link: https://lore.kernel.org/all/20250802022123.3536934-1-gxxa03070307@gmail.com/
Signed-off-by: Oleg Nesterov <oleg@...hat.com>
---
 kernel/pid.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/kernel/pid.c b/kernel/pid.c
index 8317bcbc7cf7..58d97a78f07e 100644
--- a/kernel/pid.c
+++ b/kernel/pid.c
@@ -514,7 +514,8 @@ pid_t __task_pid_nr_ns(struct task_struct *task, enum pid_type type,
 	rcu_read_lock();
 	if (!ns)
 		ns = task_active_pid_ns(current);
-	nr = pid_nr_ns(rcu_dereference(*task_pid_ptr(task, type)), ns);
+	if (ns)
+		nr = pid_nr_ns(rcu_dereference(*task_pid_ptr(task, type)), ns);
 	rcu_read_unlock();
 
 	return nr;
-- 
2.25.1.362.g51ebf55