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

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Message-Id: <20250424-work-pidfs-net-v1-4-0dc97227d854@kernel.org>
Date: Thu, 24 Apr 2025 14:24:37 +0200
From: Christian Brauner <brauner@...nel.org>
To: Oleg Nesterov <oleg@...hat.com>, Kuniyuki Iwashima <kuniyu@...zon.com>, 
 "David S. Miller" <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>, 
 Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>, 
 Simon Horman <horms@...nel.org>
Cc: linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org, 
 netdev@...r.kernel.org, David Rheinsberg <david@...dahead.eu>, 
 Jan Kara <jack@...e.cz>, Alexander Mikhalitsyn <alexander@...alicyn.com>, 
 Luca Boccassi <bluca@...ian.org>, 
 Lennart Poettering <lennart@...ttering.net>, 
 Daan De Meyer <daan.j.demeyer@...il.com>, Mike Yuan <me@...dnzj.com>, 
 Christian Brauner <brauner@...nel.org>
Subject: [PATCH RFC 4/4] net, pidfs: enable handing out pidfds for reaped
 sk->sk_peer_pid

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

Signed-off-by: Christian Brauner <brauner@...nel.org>
---
 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