netdev - [patch] unix.7: SO_PEERCRED: Mention listen(2)

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Message-ID: <CABPeg3Z5p2yapwEwPdHqDZiDL-W_gVgMc39A0Kdd95LNd+OwHA@mail.gmail.com>
Date: Wed, 20 Dec 2023 19:05:31 +0100
From: Alexey Tikhonov <atikhono@...hat.com>
To: Alejandro Colomar <alx@...nel.org>, linux-man@...r.kernel.org
Cc: libc-alpha@...rceware.org, netdev@...r.kernel.org, 
	Kuniyuki Iwashima <kuniyu@...zon.com>
Subject: [patch] unix.7: SO_PEERCRED: Mention listen(2)

>From c835c1c7c7047590263cf6c6d516092b165e013d Mon Sep 17 00:00:00 2001
From: Alexey Tikhonov <atikhono@...hat.com>
Date: Wed, 20 Dec 2023 18:28:34 +0100
Subject: [PATCH] unix.7: SO_PEERCRED: Mention listen(2)

In case of connected AF_UNIX stream sockets, server-side
credentials are set at the time of a call to listen(2),
not when client-side calls connect(2).

This is important if server side process changes UID/GID
after listen(2) and before connect(2).

Reproducer is available in https://bugzilla.redhat.com/show_bug.cgi?id=2247682

Behavior was confirmed in the email thread
https://lore.kernel.org/linux-man/CABPeg3a9L0142gmdZZ+0hoD+Q3Vgv0BQ21g8Z+gf2kznWouErA@mail.gmail.com/

Signed-off-by: Alexey Tikhonov <atikhono@...hat.com>
---
 man7/unix.7 | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/man7/unix.7 b/man7/unix.7
index e9edad467..71cdfc758 100644
--- a/man7/unix.7
+++ b/man7/unix.7
@@ -331,7 +331,8 @@ This read-only socket option returns the
 credentials of the peer process connected to this socket.
 The returned credentials are those that were in effect at the time
 of the call to
-.BR connect (2)
+.BR connect (2),
+.BR listen (2),
 or
 .BR socketpair (2).
 .IP
-- 
2.41.0

View attachment "0001-unix.7-SO_PEERCRED-Mention-listen-2.patch" of type "text/x-patch" (1220 bytes)