pkg/kfuzztest: add pkg/kfuzztest

Add a new package, pkg/kfuzztest, that implements dynamic discovery of
KFuzzTest targets by parsing a vmlinux kernel binary.

Signed-off-by: Ethan Graham <ethangraham@google.com>

2 files changed, 31 insertions, 0 deletions

diff --git a/pkg/kfuzztest/testdata/1/desc.txt b/pkg/kfuzztest/testdata/1/desc.txt
new file mode 100644
index 000000000..71c4acb39
--- /dev/null
+++ b/pkg/kfuzztest/testdata/1/desc.txt
@@ -0,0 +1,7 @@
+# This description was automatically generated with tools/kfuzztest-gen
+pkcs7_parse_message_arg {
+	data	ptr[in, array[int8]]
+	datalen	len[data, int64]
+}
+
+syz_kfuzztest_run$test_pkcs7_parse_message(name ptr[in, string["test_pkcs7_parse_message"]], data ptr[in, pkcs7_parse_message_arg], len bytesize[data]) (kfuzz_test)
diff --git a/pkg/kfuzztest/testdata/1/prog.c b/pkg/kfuzztest/testdata/1/prog.c
new file mode 100644
index 000000000..b1940ba1f
--- /dev/null
+++ b/pkg/kfuzztest/testdata/1/prog.c
@@ -0,0 +1,24 @@
+// Copyright 2025 syzkaller project authors. All rights reserved.
+// Use of this source code is governed by Apache 2 LICENSE that can be found in the LICENSE file.
+#include "../common.h"
+
+#include <stdio.h>
+#include <stdlib.h>
+
+struct pkcs7_parse_message_arg {
+	const void* data;
+	size_t datalen;
+};
+
+DEFINE_FUZZ_TARGET(test_pkcs7_parse_message, struct pkcs7_parse_message_arg);
+/* Expect data != NULL. */
+DEFINE_CONSTRAINT(pkcs7_parse_message_arg, data, NULL, NULL, EXPECT_NE);
+/* Expect datalen == len(data). */
+DEFINE_ANNOTATION(pkcs7_parse_message_arg, datalen, data, ATTRIBUTE_LEN);
+/* Annotate data as an array. */
+DEFINE_ANNOTATION(pkcs7_parse_message_arg, data, , ATTRIBUTE_ARRAY);
+
+/* Define a main function, otherwise the compiler complains. */
+int main(void)
+{
+}