[PATCH RFC 4/4] net, pidfs: enable handing out pidfds for reaped sk->sk_peer_pid

[Christian Brauner <brauner@xxxxxxxxxx>]

Now that all preconditions are met, allow handing out pidfs for reaped
sk->sk_peer_pids.

Signed-off-by: Christian Brauner <brauner@xxxxxxxxxx>
---
 net/core/sock.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/net/core/sock.c b/net/core/sock.c
index b969d2210656..017b02b69e8b 100644
--- a/net/core/sock.c
+++ b/net/core/sock.c
@@ -148,6 +148,8 @@
 
 #include <linux/ethtool.h>
 
+#include <uapi/linux/pidfd.h>
+
 #include "dev.h"
 
 static DEFINE_MUTEX(proto_list_mutex);
@@ -1891,7 +1893,7 @@ int sk_getsockopt(struct sock *sk, int level, int optname,
 		if (!peer_pid)
 			return -ENODATA;
 
-		pidfd = pidfd_prepare(peer_pid, 0, &pidfd_file);
+		pidfd = pidfd_prepare(peer_pid, PIDFD_STALE, &pidfd_file);
 		put_pid(peer_pid);
 		if (pidfd < 0) {
 			/*

-- 
2.47.2