cassanova updated this revision to Diff 443768.
cassanova added a comment.
Shows top-of-tree changes, however CMake generation fails that the
ProtobufMutator target already exists for clang-fuzzer:
CMake Error at
/opt/homebrew/Cellar/cmake/3.23.1_1/share/cmake/Modules/ExternalProject.cmake:3453
(add_custom_target):
add_custom_target cannot create target "protobuf_mutator" because another
target with the same name already exists. The existing target is a custom
target created in source directory
"/Users/chelseacassanova/code/llvm-project/clang/tools/clang-fuzzer".
Repository:
rG LLVM Github Monorepo
CHANGES SINCE LAST ACTION
https://reviews.llvm.org/D129377/new/
https://reviews.llvm.org/D129377
Files:
clang/tools/clang-fuzzer/handle-cxx/CMakeLists.txt
clang/tools/clang-fuzzer/proto-to-cxx/CMakeLists.txt
lldb/tools/lldb-fuzzer/CMakeLists.txt
lldb/tools/lldb-fuzzer/lldb-expression-fuzzer/CMakeLists.txt
lldb/tools/lldb-fuzzer/lldb-expression-fuzzer/cxx_proto.proto
lldb/tools/lldb-fuzzer/lldb-expression-fuzzer/lldb-expression-fuzzer.cpp
Index: lldb/tools/lldb-fuzzer/lldb-expression-fuzzer/lldb-expression-fuzzer.cpp
===================================================================
--- /dev/null
+++ lldb/tools/lldb-fuzzer/lldb-expression-fuzzer/lldb-expression-fuzzer.cpp
@@ -0,0 +1,73 @@
+//===-- lldb-expression-fuzzer.cpp ---------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===---------------------------------------------------------------------===//
+//
+// \file
+// This file is a fuzzer for LLDB's expression evaluator. It uses protobufs
+// and the libprotobuf-mutator to create valid C-like inputs for the
+// expression evaluator.
+//
+//===---------------------------------------------------------------------===//
+
+#include <string>
+
+#include "cxx_proto.pb.h"
+#include "handle-cxx/handle_cxx.h"
+#include "lldb/API/SBBreakpoint.h"
+#include "lldb/API/SBDebugger.h"
+#include "lldb/API/SBError.h"
+#include "lldb/API/SBLaunchInfo.h"
+#include "lldb/API/SBProcess.h"
+#include "lldb/API/SBTarget.h"
+#include "proto-to-cxx/proto_to_cxx.h"
+#include "src/libfuzzer/libfuzzer_macro.h"
+#include "llvm/ADT/StringRef.h"
+#include "llvm/Support/Error.h"
+
+using namespace lldb;
+using namespace llvm;
+using namespace clang_fuzzer;
+
+char **originalargv;
+
+extern "C" int LLVMFuzzerInitialize(int *argc, char ***argv) {
+ SBDebugger::Initialize();
+
+ // The path for a simple compiled program is needed to create a
+ // target for the debugger and that path is passed in through argv
+ originalargv = *argv;
+ return 0;
+}
+
+DEFINE_BINARY_PROTO_FUZZER(const clang_fuzzer::Function &input) {
+ auto S = clang_fuzzer::FunctionToString(input);
+
+ // Get the second argument from argv and strip the '--' from it.
+ // This will be used as the path for the object file to create a target from
+ std::string rawpath = originalargv[2];
+ StringRef objpath = rawpath.erase(0, 2);
+
+ // Create a debugger and a target
+ SBDebugger debugger = SBDebugger::Create(false);
+ SBTarget target = debugger.CreateTarget(objpath.str().c_str());
+
+ // Create a breakpoint on the only line in the program
+ SBBreakpoint bp = target.BreakpointCreateByLocation(objpath.str().c_str(), 1);
+
+ // Create launch info and error for launching the process
+ SBLaunchInfo li = target.GetLaunchInfo();
+ SBError error;
+
+ // Launch the process and evaluate the fuzzer's input data
+ // as an expression
+ SBProcess process = target.Launch(li, error);
+ target.EvaluateExpression(S.c_str());
+
+ debugger.DeleteTarget(target);
+ SBDebugger::Destroy(debugger);
+ SBModule::GarbageCollectAllocatedModules();
+}
Index: lldb/tools/lldb-fuzzer/lldb-expression-fuzzer/cxx_proto.proto
===================================================================
--- /dev/null
+++ lldb/tools/lldb-fuzzer/lldb-expression-fuzzer/cxx_proto.proto
@@ -0,0 +1,92 @@
+//===-- cxx_proto.proto - Protobuf description of C++ ---------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+///
+/// \file
+/// This file describes a subset of C++ as a protobuf. It is used to
+/// more easily find interesting inputs for fuzzing Clang.
+///
+//===----------------------------------------------------------------------===//
+
+syntax = "proto2";
+
+message VarRef {
+ required int32 varnum = 1;
+}
+
+message Lvalue {
+ required VarRef varref = 1;
+}
+
+message Const {
+ required int32 val = 1;
+}
+
+message BinaryOp {
+ enum Op {
+ PLUS = 0;
+ MINUS = 1;
+ MUL = 2;
+ DIV = 3;
+ MOD = 4;
+ XOR = 5;
+ AND = 6;
+ OR = 7;
+ EQ = 8;
+ NE = 9;
+ LE = 10;
+ GE = 11;
+ LT = 12;
+ GT = 13;
+ };
+ required Op op = 1;
+ required Rvalue left = 2;
+ required Rvalue right = 3;
+}
+
+message Rvalue {
+ oneof rvalue_oneof {
+ VarRef varref = 1;
+ Const cons = 2;
+ BinaryOp binop = 3;
+ }
+}
+
+message AssignmentStatement {
+ required Lvalue lvalue = 1;
+ required Rvalue rvalue = 2;
+}
+
+
+message IfElse {
+ required Rvalue cond = 1;
+ required StatementSeq if_body = 2;
+ required StatementSeq else_body = 3;
+}
+
+message While {
+ required Rvalue cond = 1;
+ required StatementSeq body = 2;
+}
+
+message Statement {
+ oneof stmt_oneof {
+ AssignmentStatement assignment = 1;
+ IfElse ifelse = 2;
+ While while_loop = 3;
+ }
+}
+
+message StatementSeq {
+ repeated Statement statements = 1;
+}
+
+message Function {
+ required StatementSeq statements = 1;
+}
+
+package clang_fuzzer;
Index: lldb/tools/lldb-fuzzer/lldb-expression-fuzzer/CMakeLists.txt
===================================================================
--- /dev/null
+++ lldb/tools/lldb-fuzzer/lldb-expression-fuzzer/CMakeLists.txt
@@ -0,0 +1,50 @@
+if(CLANG_ENABLE_PROTO_FUZZER)
+ set(LLVM_LINK_COMPONENTS
+ Support
+ )
+
+ add_llvm_fuzzer(lldb-expression-fuzzer
+ EXCLUDE_FROM_ALL
+ lldb-expression-fuzzer.cpp
+ )
+
+ if(TARGET lldb-expression-fuzzer)
+ target_include_directories(lldb-expression-fuzzer PRIVATE ..)
+
+ set(CLANG_CMAKE_MODULE_PATH
+ ${CMAKE_CURRENT_SOURCE_DIR}/../../../../clang/cmake/modules)
+
+ set(CMAKE_MODULE_PATH
+ ${CMAKE_MODULE_PATH}
+ ${CLANG_CMAKE_MODULE_PATH})
+
+ include(ProtobufMutator)
+ include_directories(${ProtobufMutator_INCLUDE_DIRS})
+
+ target_link_libraries(lldb-expression-fuzzer
+ PRIVATE
+ ${ProtobufMutator_LIBRARIES}
+ ${LLVM_LIB_FUZZING_ENGINE}
+ clangHandleCXX
+ clangCXXProto
+ clangProtoToCXX
+ liblldb
+ )
+
+ add_custom_command(TARGET lldb-expression-fuzzer PRE_BUILD
+ # Create and compile a simple C program using the command line. This is
+ # needed because LLDB's expression evaluator needs a legitmate target
+ # instead of a dummy target
+ COMMAND echo 'int main (int argc, char** argv) { return 0\; }' | clang -o main.out -xc -
+ )
+
+ # Create a directory for storing the fuzzer's artifacts and run the fuzzer with arguments that will
+ # not attempt to reduce the size of the inputs being generated
+ add_custom_target(fuzz-lldb-expression
+ COMMENT "Running the LLDB expression evaluator fuzzer..."
+ WORKING_DIRECTORY ${CMAKE_BINARY_DIR}/fuzzer-artifacts/expression-artifacts
+ COMMAND $<TARGET_FILE:lldb-expression-fuzzer> -artifact_prefix=expression- -reduce_inputs=0
+ USES_TERMINAL
+ )
+ endif()
+endif()
Index: lldb/tools/lldb-fuzzer/CMakeLists.txt
===================================================================
--- lldb/tools/lldb-fuzzer/CMakeLists.txt
+++ lldb/tools/lldb-fuzzer/CMakeLists.txt
@@ -1,3 +1,4 @@
add_subdirectory(lldb-commandinterpreter-fuzzer)
+add_subdirectory(lldb-expression-fuzzer)
add_subdirectory(lldb-target-fuzzer)
add_subdirectory(utils)
Index: clang/tools/clang-fuzzer/proto-to-cxx/CMakeLists.txt
===================================================================
--- clang/tools/clang-fuzzer/proto-to-cxx/CMakeLists.txt
+++ clang/tools/clang-fuzzer/proto-to-cxx/CMakeLists.txt
@@ -14,6 +14,8 @@
DEPENDS clangCXXLoopProto
LINK_LIBS clangCXXLoopProto ${PROTOBUF_LIBRARIES}
)
+target_include_directories(clangProtoToCXX PUBLIC .)
+target_include_directories(clangLoopProtoToCXX PUBLIC .)
add_clang_executable(clang-proto-to-cxx proto_to_cxx_main.cpp)
add_clang_executable(clang-loop-proto-to-cxx loop_proto_to_cxx_main.cpp)
Index: clang/tools/clang-fuzzer/handle-cxx/CMakeLists.txt
===================================================================
--- clang/tools/clang-fuzzer/handle-cxx/CMakeLists.txt
+++ clang/tools/clang-fuzzer/handle-cxx/CMakeLists.txt
@@ -11,3 +11,5 @@
clangSerialization
clangTooling
)
+
+target_include_directories(clangHandleCXX PUBLIC .)
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