netdev - [PATCH selftest/net/af_unix 1/1] Fix size of parameter to connect()

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Message-ID: <bd7ff00a-6892-fd56-b3ca-4b3feb6121d8@alu.unizg.hr>
Date:   Fri, 6 Jan 2023 18:18:58 +0100
From:   Mirsad Goran Todorovac <mirsad.todorovac@....unizg.hr>
To:     netdev@...r.kernel.org
Cc:     "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>, Shuah Khan <shuah@...nel.org>,
        Kuniyuki Iwashima <kuniyu@...zon.co.jp>,
        linux-kselftest@...r.kernel.org, linux-kernel@...r.kernel.org,
        Florian Westphal <fw@...len.de>
Subject: [PATCH selftest/net/af_unix 1/1] Fix size of 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).

The patch is generated against the "vanilla" torvalds mainline tree 6.2-rc2.

Thanks and regards,
Mirsad Todorovac

Reported-by: Mirsad Goran Todorovac <mirsad.todorovac@....unizg.hr>
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>

---
  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