selftests: tls: test skb copy under mem pressure and OOB

JIRA: https://issues.redhat.com/browse/RHEL-115640

commit 4c05c7e
Author: Jakub Kicinski <kuba@kernel.org>
Date:   Tue Sep 16 17:28:14 2025 -0700

    selftests: tls: test skb copy under mem pressure and OOB

    Add a test which triggers mem pressure via OOB writes.

    Reviewed-by: Sabrina Dubroca <sd@queasysnail.net>
    Signed-off-by: Jakub Kicinski <kuba@kernel.org>
    Link: https://patch.msgid.link/20250917002814.1743558-2-kuba@kernel.org
    Signed-off-by: Paolo Abeni <pabeni@redhat.com>

Signed-off-by: Sabrina Dubroca <sdubroca@redhat.com>

Author: Sabrina Dubroca

tools/testing/selftests/net/tls.c

@@ -2258,6 +2258,22 @@ TEST_F(tls_err, poll_partial_rec_async)
 	}
 }
 
+/* Use OOB+large send to trigger copy mode due to memory pressure.
+ * OOB causes a short read.
+ */
+TEST_F(tls_err, oob_pressure)
+{
+	char buf[1<<16];
+	int i;
+
+	memrnd(buf, sizeof(buf));
+
+	EXPECT_EQ(send(self->fd2, buf, 5, MSG_OOB), 5);
+	EXPECT_EQ(send(self->fd2, buf, sizeof(buf), 0), sizeof(buf));
+	for (i = 0; i < 64; i++)
+		EXPECT_EQ(send(self->fd2, buf, 5, MSG_OOB), 5);
+}
+
 TEST(non_established) {
 	struct tls12_crypto_info_aes_gcm_256 tls12;
 	struct sockaddr_in addr;