From 845c4a543c091f5951b5e5b2063531ad264da6d1 Mon Sep 17 00:00:00 2001
From: Yakov Olkhovskiy <yakov@clickhouse.com>
Date: Thu, 10 Oct 2024 18:59:48 +0000
Subject: [PATCH] add test for libfuzzer

---
 utils/CMakeLists.txt                                  |  4 ++++
 utils/libfuzzer-test/CMakeLists.txt                   |  1 +
 utils/libfuzzer-test/README.md                        |  1 +
 utils/libfuzzer-test/test_basic_fuzzer/CMakeLists.txt |  1 +
 utils/libfuzzer-test/test_basic_fuzzer/main.cpp       | 11 +++++++++++
 5 files changed, 18 insertions(+)
 create mode 100644 utils/libfuzzer-test/CMakeLists.txt
 create mode 100644 utils/libfuzzer-test/README.md
 create mode 100644 utils/libfuzzer-test/test_basic_fuzzer/CMakeLists.txt
 create mode 100644 utils/libfuzzer-test/test_basic_fuzzer/main.cpp

diff --git a/utils/CMakeLists.txt b/utils/CMakeLists.txt
index ec44a1e1de9..8c706ee6b67 100644
--- a/utils/CMakeLists.txt
+++ b/utils/CMakeLists.txt
@@ -23,3 +23,7 @@ if (ENABLE_UTILS)
     add_subdirectory (keeper-data-dumper)
     add_subdirectory (memcpy-bench)
 endif ()
+
+if (ENABLE_FUZZING)
+    add_subdirectory (libfuzzer-test)
+endif ()
diff --git a/utils/libfuzzer-test/CMakeLists.txt b/utils/libfuzzer-test/CMakeLists.txt
new file mode 100644
index 00000000000..8765787ff8a
--- /dev/null
+++ b/utils/libfuzzer-test/CMakeLists.txt
@@ -0,0 +1 @@
+add_subdirectory (test_basic_fuzzer)
diff --git a/utils/libfuzzer-test/README.md b/utils/libfuzzer-test/README.md
new file mode 100644
index 00000000000..5598cbdb961
--- /dev/null
+++ b/utils/libfuzzer-test/README.md
@@ -0,0 +1 @@
+This folder contains various stuff intended to test libfuzzer functionality.
diff --git a/utils/libfuzzer-test/test_basic_fuzzer/CMakeLists.txt b/utils/libfuzzer-test/test_basic_fuzzer/CMakeLists.txt
new file mode 100644
index 00000000000..dc927f35a4b
--- /dev/null
+++ b/utils/libfuzzer-test/test_basic_fuzzer/CMakeLists.txt
@@ -0,0 +1 @@
+add_executable (test_basic_fuzzer main.cpp)
diff --git a/utils/libfuzzer-test/test_basic_fuzzer/main.cpp b/utils/libfuzzer-test/test_basic_fuzzer/main.cpp
new file mode 100644
index 00000000000..7ccad63273d
--- /dev/null
+++ b/utils/libfuzzer-test/test_basic_fuzzer/main.cpp
@@ -0,0 +1,11 @@
+#include <stdint.h>
+#include <stddef.h>
+
+extern "C" int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size)
+{
+    if (size > 0 && data[0] == 'H')
+        if (size > 1 && data[1] == 'I')
+            if (size > 2 && data[2] == '!')
+                __builtin_trap();
+    return 0;
+}