netdev - [PATCH net v4] af_unix: selftest: Fix the size of the parameter to connect()

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Date:   Sat, 7 Jan 2023 04:40:20 +0100 (CET)
From:   Mirsad Goran Todorovac <mirsad.todorovac@....hr>
To:     Jakub Kicinski <kuba@...nel.org>,
        Mirsad Goran Todorovac <mirsad.todorovac@....unizg.hr>
cc:     Kuniyuki Iwashima <kuniyu@...zon.com>, davem@...emloft.net,
        edumazet@...gle.com, fw@...len.de, kuniyu@...zon.co.jp,
        linux-kernel@...r.kernel.org, linux-kselftest@...r.kernel.org,
        netdev@...r.kernel.org, pabeni@...hat.com, shuah@...nel.org
Subject: [PATCH net v4] af_unix: selftest: Fix the size of the parameter to
 connect()


From: Mirsad Goran Todorovac <mirsad.todorovac@....unizg.hr>

Adjust size parameter in connect() to match the type of the parameter, to
fix "No such file or directory" error in selftests/net/af_unix/
test_oob_unix.c:127.

The existing code happens to work provided that the autogenerated pathname
is shorter than sizeof (struct sockaddr), which is why it hasn't been
noticed earlier.

Visible from the trace excerpt:

bind(3, {sa_family=AF_UNIX, sun_path="unix_oob_453059"}, 110) = 0
clone(child_stack=NULL, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD, child_tidptr=0x7fa6a6577a10) = 453060
[pid <child>] connect(6, {sa_family=AF_UNIX, sun_path="unix_oob_45305"}, 16) = -1 ENOENT (No such file or directory)

BUG: The filename is trimmed to sizeof (struct sockaddr).

Cc: "David S. Miller" <davem@...emloft.net>
Cc: Eric Dumazet <edumazet@...gle.com>
Cc: Jakub Kicinski <kuba@...nel.org>
Cc: Paolo Abeni <pabeni@...hat.com>
Cc: Shuah Khan <shuah@...nel.org>
Cc: Kuniyuki Iwashima <kuniyu@...zon.co.jp>
Cc: Florian Westphal <fw@...len.de>
Reviewed-by: Florian Westphal <fw@...len.de>
Fixes: 314001f0bf92 ("af_unix: Add OOB support")
Signed-off-by: Mirsad Goran Todorovac <mirsad.todorovac@....unizg.hr>
---

The patch is generated against the "vanilla" Torvalds mainline tree 6.2-rc2.
(Tested and applies against the net.git tree.)


 tools/testing/selftests/net/af_unix/test_unix_oob.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/testing/selftests/net/af_unix/test_unix_oob.c b/tools/testing/selftests/net/af_unix/test_unix_oob.c
index b57e91e1c3f2..532459a15067 100644
--- a/tools/testing/selftests/net/af_unix/test_unix_oob.c
+++ b/tools/testing/selftests/net/af_unix/test_unix_oob.c
@@ -124,7 +124,7 @@ void producer(struct sockaddr_un *consumer_addr)
 
 	wait_for_signal(pipefd[0]);
 	if (connect(cfd, (struct sockaddr *)consumer_addr,
-		     sizeof(struct sockaddr)) != 0) {
+		     sizeof(*consumer_addr)) != 0) {
 		perror("Connect failed");
 		kill(0, SIGTERM);
 		exit(1);

--
Mirsad Goran Todorovac
Sistem inženjer
Grafički fakultet | Akademija likovnih umjetnosti
Sveučilište u Zagrebu

System engineer
Faculty of Graphic Arts | Academy of Fine Arts
University of Zagreb, Republic of Croatia
The European Union