1 files changed, 108 insertions, 0 deletions
diff --git a/tests/sys/fs/fusefs/bad_server.cc b/tests/sys/fs/fusefs/bad_server.cc
new file mode 100644
index 000000000000..825523cac2bb
--- /dev/null
+++ b/tests/sys/fs/fusefs/bad_server.cc
@@ -0,0 +1,108 @@
+/*-
+ * SPDX-License-Identifier: BSD-2-Clause
+ *
+ * Copyright (c) 2023 Axcient
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+extern "C" {
+#include <fcntl.h>
+#include <unistd.h>
+}
+
+#include "mockfs.hh"
+#include "utils.hh"
+
+using namespace testing;
+
+class BadServer: public FuseTest {};
+
+/*
+ * If the server sends a response for an unknown request, the kernel should
+ * gracefully return EINVAL.
+ */
+TEST_F(BadServer, UnknownUnique)
+{
+	mockfs_buf_out out;
+
+	out.header.len = sizeof(out.header);
+	out.header.error = 0;
+	out.header.unique = 99999;		// Invalid!
+	out.expected_errno = EINVAL;
+	m_mock->write_response(out);
+}
+
+/*
+ * If the server sends less than a header's worth of data, the kernel should
+ * gracefully return EINVAL.
+ */
+TEST_F(BadServer, ShortWrite)
+{
+	mockfs_buf_out out;
+
+	out.header.len = sizeof(out.header) - 1;
+	out.header.error = 0;
+	out.header.unique = 0;			// Asynchronous notification
+	out.expected_errno = EINVAL;
+	/*
+	 * Tell the event loop to quit.  The kernel will disconnect us
+	 * because of the short write.
+	 */
+	m_mock->m_expect_unmount = true;
+	m_mock->write_response(out);
+}
+
+/*
+ * It is illegal to report an error, and also send back a payload.
+ */
+TEST_F(BadServer, ErrorWithPayload)
+{
+	const char FULLPATH[] = "mountpoint/some_file.txt";
+	const char RELPATH[] = "some_file.txt";
+
+	EXPECT_LOOKUP(FUSE_ROOT_ID, RELPATH)
+	.WillOnce(Invoke([&](auto in, auto &out) {
+		// First send an invalid response
+		std::unique_ptr<mockfs_buf_out> out0(new mockfs_buf_out);
+		out0->header.unique = in.header.unique;
+		out0->header.error = -ENOENT;
+		SET_OUT_HEADER_LEN(*out0, entry);	// Invalid!
+		out0->expected_errno = EINVAL;
+		out.push_back(std::move(out0));
+
+		// Then, respond to the lookup so we can complete the test
+		std::unique_ptr<mockfs_buf_out> out1(new mockfs_buf_out);
+		out1->header.unique = in.header.unique;
+		out1->header.error = -ENOENT;
+		out1->header.len = sizeof(out1->header);
+		out.push_back(std::move(out1));
+
+		// The kernel may disconnect us for bad behavior, so don't try
+		// to read or write any more.
+		m_mock->m_quit = true;
+	}));
+
+	EXPECT_NE(0, access(FULLPATH, F_OK));
+
+	EXPECT_EQ(ENOENT, errno);
+}