From b796632fc83c8f9e0d97443f4f389ef9dddadb11 Mon Sep 17 00:00:00 2001 From: Michal Luczaj Date: Sun, 23 Nov 2025 22:43:59 +0100 Subject: [PATCH] vsock/test: Extend transport change null-ptr-deref test syzkaller reported a lockdep lock order inversion warning[1] due to commit 687aa0c5581b ("vsock: Fix transport_* TOCTOU"). This was fixed in commit f7c877e75352 ("vsock: fix lock inversion in vsock_assign_transport()"). Redo syzkaller's repro by piggybacking on a somewhat related test implemented in commit 3a764d93385c ("vsock/test: Add test for null ptr deref when transport changes"). [1]: https://lore.kernel.org/netdev/68f6cdb0.a70a0220.205af.0039.GAE@google.com/ Signed-off-by: Michal Luczaj Reviewed-by: Stefano Garzarella Link: https://patch.msgid.link/20251123-vsock_test-linger-lockdep-warn-v1-1-4b1edf9d8cdc@rbox.co Signed-off-by: Jakub Kicinski --- tools/testing/vsock/vsock_test.c | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-) diff --git a/tools/testing/vsock/vsock_test.c b/tools/testing/vsock/vsock_test.c index d4517386e551..9e1250790f33 100644 --- a/tools/testing/vsock/vsock_test.c +++ b/tools/testing/vsock/vsock_test.c @@ -2015,6 +2015,11 @@ static void test_stream_transport_change_client(const struct test_opts *opts) exit(EXIT_FAILURE); } + /* Although setting SO_LINGER does not affect the original test + * for null-ptr-deref, it may trigger a lockdep warning. + */ + enable_so_linger(s, 1); + ret = connect(s, (struct sockaddr *)&sa, sizeof(sa)); /* The connect can fail due to signals coming from the thread, * or because the receiver connection queue is full. @@ -2352,7 +2357,7 @@ static struct test_case test_cases[] = { .run_server = test_stream_nolinger_server, }, { - .name = "SOCK_STREAM transport change null-ptr-deref", + .name = "SOCK_STREAM transport change null-ptr-deref, lockdep warn", .run_client = test_stream_transport_change_client, .run_server = test_stream_transport_change_server, },