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vsock/test: Add test for SO_LINGER null ptr deref

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Explicitly close() a TCP_ESTABLISHED (connectible) socket with SO_LINGER
enabled.

As for now, test does not verify if close() actually lingers.
On an unpatched machine, may trigger a null pointer dereference.

Tested-by: Luigi Leonardi <leonardi@redhat.com>
Reviewed-by: Luigi Leonardi <leonardi@redhat.com>
Reviewed-by: Stefano Garzarella <sgarzare@redhat.com>
Signed-off-by: Michal Luczaj <mhal@rbox.co>
Link: https://patch.msgid.link/20250210-vsock-linger-nullderef-v3-2-ef6244d02b54@rbox.co
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Michal Luczaj 2025-02-10 13:15:01 +01:00 • committed by Jakub Kicinski
parent 78dafe1cf3
commit 440c9d4887
1 changed files with 41 additions and 0 deletions
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41
tools/testing/vsock/vsock_test.c
View file

@ -1788,6 +1788,42 @@ static void test_stream_connect_retry_server(const struct test_opts *opts)
close(fd); close(fd);
} }
static void test_stream_linger_client(const struct test_opts *opts)
{
struct linger optval = {
.l_onoff = 1,
.l_linger = 1
};
int fd;
fd = vsock_stream_connect(opts->peer_cid, opts->peer_port);
if (fd < 0) {
perror("connect");
exit(EXIT_FAILURE);
}
if (setsockopt(fd, SOL_SOCKET, SO_LINGER, &optval, sizeof(optval))) {
perror("setsockopt(SO_LINGER)");
exit(EXIT_FAILURE);
}
close(fd);
}
static void test_stream_linger_server(const struct test_opts *opts)
{
int fd;
fd = vsock_stream_accept(VMADDR_CID_ANY, opts->peer_port, NULL);
if (fd < 0) {
perror("accept");
exit(EXIT_FAILURE);
}
vsock_wait_remote_close(fd);
close(fd);
}
static struct test_case test_cases[] = { static struct test_case test_cases[] = {
{ {
.name = "SOCK_STREAM connection reset", .name = "SOCK_STREAM connection reset",
@ -1943,6 +1979,11 @@ static struct test_case test_cases[] = {
.run_client = test_stream_connect_retry_client, .run_client = test_stream_connect_retry_client,
.run_server = test_stream_connect_retry_server, .run_server = test_stream_connect_retry_server,
}, },
{
.name = "SOCK_STREAM SO_LINGER null-ptr-deref",
.run_client = test_stream_linger_client,
.run_server = test_stream_linger_server,
},
{}, {},
}; };