add oss-fuzz client
This commit is contained in:
Daniel Marjamäki
parent
b5a285319c
commit
cd924821de
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@ -0,0 +1,32 @@
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# Cppcheck fuzzer
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#
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# Example compile command when using AFL:
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# make CXX=../afl/afl-clang++ CXXFLAGS="-static -O1"
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#
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# Example compile command when using LibFuzzer:
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# make CXX=clang++-6.0 CXXFLAGS="-O1 -fsanitize=address,fuzzer -DNO_MAIN"
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#
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# Standalone LibFuzzer tool
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# make CXX=clang++-6.0 CXXFLAGS="-O1 -fsanitize=address,fuzzer-no-link"
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TARGET_NAME=cppcheck-fuzzing-client
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CPPCHECK_DIR=../cppcheck
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INCLUDE_DIR=-I ${CPPCHECK_DIR}/lib -I ${CPPCHECK_DIR}/externals/simplecpp -I ${CPPCHECK_DIR}/externals/tinyxml
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SRC_FILES=main.cpp ${CPPCHECK_DIR}/externals/simplecpp/simplecpp.cpp ${CPPCHECK_DIR}/externals/tinyxml/tinyxml2.cpp ${CPPCHECK_DIR}/lib/*.cpp
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OBJ_FILES=main.cpp ${CPPCHECK_DIR}/externals/simplecpp/simplecpp.o ${CPPCHECK_DIR}/externals/tinyxml/tinyxml2.o ${CPPCHECK_DIR}/lib/*.o
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all: ${TARGET_NAME}
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${TARGET_NAME}: main.cpp
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${CXX} -std=c++11 -g ${CXXFLAGS} -o ${TARGET_NAME} ${INCLUDE_DIR} ${SRC_FILES}
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oss-fuzz-client:
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${CXX} -std=c++11 -g -DNO_MAIN ${CXXFLAGS} -o oss-fuzz-client ${INCLUDE_DIR} ${SRC_FILES} -lFuzzingEngine
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fast-build: main.cpp
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${CXX} -std=c++11 -g ${CXXFLAGS} -o ${TARGET_NAME} ${INCLUDE_DIR} ${OBJ_FILES}
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clean:
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rm -f ${TARGET_NAME}
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@ -0,0 +1,346 @@
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#include <fstream>
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#include <iostream>
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#include <sstream>
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#include <cstring>
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#include "cppcheck.h"
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#ifdef NOMAIN
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constexpr int type = 2;
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constexpr bool execCppcheck = true;
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#else
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int type = 0;
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bool execCppcheck = true;
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#endif
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// Type 2 constants:
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constexpr int TYPE2_BITS_VARNR = 2; // 4 local variables
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class CppcheckExecutor : public ErrorLogger {
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private:
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CppCheck cppcheck;
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public:
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CppcheckExecutor()
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: ErrorLogger()
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, cppcheck(*this, false) {
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cppcheck.settings().addEnabled("all");
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cppcheck.settings().inconclusive = true;
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}
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void run(const std::string &code) {
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cppcheck.check("test.cpp", code);
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}
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void reportOut(const std::string &outmsg) { }
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void reportErr(const ErrorLogger::ErrorMessage &msg) {}
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void reportProgress(const std::string& filename,
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const char stage[],
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const unsigned int value) {}
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};
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static const char * const data0[] = {
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"(", ")", "{", "}", "[", "]",
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"<", "<=", "==", "!=", ">=", ">",
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"+", "-", "*", "/", "%", "~", "&", "|", "^", "&&", "||", "++", "--", "=", "?", ":"
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"name1", "name2", "name3", "name4", "name5", "name6",
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"const", "void", "char", "int", "enum", "if", "else", "while", "for", "switch", "case", "default", "return", "continue", "break", "struct", "typedef",
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";", ",",
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"1", "0.1", "0xff", "-5", "\"abc\"", "'x'",
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};
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static const char * const data1[] = {
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"(", ")", "[", "]", "{", "}",
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"<", "<=", "==", "!=", ">=", ">",
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"+", "-", "*", "/", "%", "~", "&", "|", "^", "&&", "||", "++", "--", "=", "?", ":",
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"name1", "name2", "name3", "name4", "name5", "name6",
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"const", "void", "char", "int", "enum", "if", "else", "while", "for", "switch", "case", "default", "return", "continue", "break", "struct", "typedef",
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",", ";", "#", "##", ".", "->", "...",
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"1", "0.1", "0xff", "-5", "\"abc\"", "'x'"
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};
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#define NUM(data) (sizeof(data)/sizeof(*data))
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static void writeCode(std::ostream &ostr, int type, unsigned int *value, unsigned int *ones, const unsigned int min) {
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static char par[20] = {' ',0};
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static char parindex = 0;
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const unsigned int num = (type == 0) ? NUM(data0) : NUM(data1);
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const char * const * const data = (type == 0) ? data0 : data1;
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while (*ones > min) {
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unsigned char i = *value % num;
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*value = *value / num;
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*ones = *ones / num;
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if (parindex < (sizeof(par)-1) && std::strchr("([{", *data[i]))
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par[++parindex] = *data[i+1];
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else if (std::strchr(")]}", *data[i])) {
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while (parindex > 0 && par[parindex] != *data[i])
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ostr << par[parindex--];
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if (parindex > 0)
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parindex--;
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else
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ostr << *data[i-1];
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}
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ostr << ' ' << data[i];
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}
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if (min == 0) {
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while (parindex > 0)
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ostr << par[parindex--];
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}
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}
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int getValue(const uint8_t *data, size_t dataSize, uint8_t maxValue, bool *done = nullptr) {
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static size_t pos; // current "data" position
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static int dataValue; // value extracted from data
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static int ones; // ones. This variable tracks if we need to add more stuff in "dataValue".
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// Shift more bits from "data" into "dataValue" if needed
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while (pos < dataSize && ones < 0xFFFF) {
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ones = (ones << 8) | 0xff;
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dataValue = (dataValue << 8) | data[pos];
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pos++;
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}
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if (done)
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*done = (ones == 0);
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if (maxValue == 0)
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return 0;
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// Shift out info from "dataValue" using % . Using & and >> would work but then we are limited to "power of 2" max value.
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const int ret = dataValue % maxValue;
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ones /= maxValue;
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dataValue /= maxValue;
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return ret;
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}
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static std::string generateExpression2_lvalue(const uint8_t *data, size_t dataSize) {
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return "var" + std::to_string(1 + getValue(data, dataSize, 5));
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}
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static std::string generateExpression2_Op(const uint8_t *data, size_t dataSize, int numberOfGlobalConstants) {
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std::ostringstream code;
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switch (getValue(data, dataSize, 3))
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{
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case 0:
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code << generateExpression2_lvalue(data, dataSize);
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break;
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case 1:
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code << "globalconstant" << (1 + getValue(data, dataSize, numberOfGlobalConstants));
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break;
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case 2:
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code << (getValue(data, dataSize, 0x80) * 0x80 + getValue(data, dataSize, 0x80));
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break;
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};
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return code.str();
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}
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static std::string generateExpression2_Expr(const uint8_t *data, size_t dataSize, int numberOfGlobalConstants, int depth=0) {
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++depth;
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const unsigned int type = (depth > 3) ? 0 : getValue(data, dataSize, 3);
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const char binop[] = "=<>+-*/%&|^";
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const char *unop[] = {"++","--","()","~"};
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switch (type) {
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case 0:
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return generateExpression2_Op(data, dataSize, numberOfGlobalConstants);
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case 1: {
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const char op = binop[getValue(data,dataSize,sizeof(binop)-1)];
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const std::string lhs = (op == '=') ?
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generateExpression2_lvalue(data, dataSize) :
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generateExpression2_Expr(data, dataSize, numberOfGlobalConstants, depth);
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const std::string rhs = generateExpression2_Expr(data, dataSize, numberOfGlobalConstants, depth);
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return lhs + op + rhs;
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}
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case 2: {
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const char *u = unop[getValue(data,dataSize,sizeof(unop)/sizeof(*unop))];
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if (u == std::string("()"))
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return "(" + generateExpression2_Expr(data, dataSize, numberOfGlobalConstants, depth) + ")";
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else if (u == std::string("++") || u == std::string("--"))
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return u + generateExpression2_lvalue(data, dataSize);
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return u + generateExpression2_Expr(data, dataSize, numberOfGlobalConstants, depth);
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}
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default:
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break;
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};
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return "0";
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}
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static std::string generateExpression2_Cond(const uint8_t *data, size_t dataSize, int numberOfGlobalConstants)
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{
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const char *comp[] = {"==", "!=", "<", "<=", ">", ">="};
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const int i = getValue(data, dataSize, 6);
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const std::string lhs = generateExpression2_Expr(data, dataSize, numberOfGlobalConstants);
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const std::string rhs = generateExpression2_Expr(data, dataSize, numberOfGlobalConstants);
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return lhs + comp[i] + rhs;
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}
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static std::string functionStart() {
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static int functionNumber;
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return "int f" + std::to_string(++functionNumber) + "()\n"
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"{\n";
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}
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static std::string generateExpression2_conditionalCode(const std::string &indent,
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const uint8_t *data,
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size_t dataSize,
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int numberOfGlobalConstants)
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{
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std::ostringstream code;
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if (indent.empty())
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code << functionStart();
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else
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code << indent << "{\n";
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for (int line = 0; line < 4 || indent.empty(); ++line)
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{
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bool done = false;
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const int type1 = getValue(data, dataSize, 8, &done);
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if (done)
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break;
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const int mostLikelyType = (line >= 2) ? 4 : 0; // should var assignment or return be more likely?
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const int type2 = (indent.size() >= 12) ?
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mostLikelyType : // max indentation, no inner conditions
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((type1 >= 5) ? mostLikelyType : type1);
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if (type2 == 0) {
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code << indent << " var" << getValue(data, dataSize, 5) << "=" << generateExpression2_Expr(data, dataSize, numberOfGlobalConstants) << ";\n";
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} else if (type2 == 1) {
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code << indent << " if (" << generateExpression2_Cond(data, dataSize, numberOfGlobalConstants) << ")\n";
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code << generateExpression2_conditionalCode(indent + " ", data, dataSize, numberOfGlobalConstants);
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} else if (type2 == 2) {
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code << indent << " if (" << generateExpression2_Cond(data, dataSize, numberOfGlobalConstants) << ")\n";
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code << generateExpression2_conditionalCode(indent + " ", data, dataSize, numberOfGlobalConstants);
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code << indent << " else\n";
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code << generateExpression2_conditionalCode(indent + " ", data, dataSize, numberOfGlobalConstants);
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} else if (type2 == 3) {
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code << indent << " while (" << generateExpression2_Cond(data, dataSize, numberOfGlobalConstants) << ")\n";
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code << generateExpression2_conditionalCode(indent + " ", data, dataSize, numberOfGlobalConstants);
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} else if (type2 == 4) {
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code << indent << " return " << generateExpression2_Expr(data, dataSize, numberOfGlobalConstants) << ";\n";
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if (indent.empty())
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code << "}\n\n" << functionStart();
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else
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break;
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}
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}
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if (!indent.empty())
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code << indent << "}\n";
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else
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code << " return 0;\n}\n";
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return code.str();
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}
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static std::string generateCode2(const uint8_t *data, size_t dataSize) {
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std::ostringstream code;
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// create global constants
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constexpr int numberOfGlobalConstants = 0;
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/*
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const int numberOfGlobalConstants = getValue(data, dataSize, 5);
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for (int nr = 1; nr <= numberOfGlobalConstants; nr++) {
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const char *types[4] = {"char", "int", "long long", "float"};
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code << "const " << types[getValue(data, dataSize, 4)] << " globalconstant" << nr << " = " << generateExpression2_Expr(data, dataSize, nr - 1) << ";\n";
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}
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*/
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code << "int var1 = 1;\n"
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"int var2 = 0;\n"
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"int var3 = 1;\n"
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"int var4 = 0;\n"
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"int var5 = -1;\n\n";
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code << generateExpression2_conditionalCode("", data, dataSize, numberOfGlobalConstants);
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return code.str();
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}
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static std::string generateCode(const uint8_t *data, size_t dataSize) {
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if (type == 2)
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return generateCode2(data, dataSize);
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std::ostringstream ostr;
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unsigned int value = 0;
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unsigned int ones = 0;
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for (size_t i = 0; i < dataSize; ++i) {
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uint8_t c = data[i];
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value = (value << 8) | c;
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ones = (ones << 8) | 0xff;
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writeCode(ostr, type, &value, &ones, 0x100);
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}
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writeCode(ostr, type, &value, &ones, 0);
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std::string code;
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switch (type) {
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case 0:
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code = ostr.str();
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break;
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case 1:
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code = "void f() {\n x=" + ostr.str() + ";\n}";
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break;
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}
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return code;
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}
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extern "C" int LLVMFuzzerTestOneInput(const uint8_t *data, size_t dataSize) {
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CppcheckExecutor cppcheckExecutor;
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cppcheckExecutor.run(generateCode(data, dataSize));
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return 0;
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}
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#ifndef NO_MAIN
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int main(int argc, char **argv) {
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const char *filename = nullptr;
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bool execCppcheck = true;
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std::cout << "Command line:";
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for (int i = 0; i < argc; ++i)
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std::cout << " " << argv[i];
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std::cout << "\n";
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for (int i = 1; i < argc; ++i) {
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if (strcmp(argv[i],"--type1")==0)
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type = 1;
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else if (strcmp(argv[i],"--type2")==0)
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type = 2;
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else if (strcmp(argv[i],"--translate-input")==0)
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execCppcheck = false;
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else if (*argv[i] == '-') {
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std::cout << "Invalid option: " << argv[i] << std::endl;
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} else
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filename = argv[i];
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}
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if (!filename) {
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std::cout << "Invalid args, no filename\n";
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return 1;
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}
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std::ifstream f(filename);
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if (!f.is_open()) {
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std::cout << "failed to open file:" << filename << "\n";
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return 1;
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}
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std::string str((std::istreambuf_iterator<char>(f)),
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std::istreambuf_iterator<char>());
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if (execCppcheck)
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LLVMFuzzerTestOneInput((const uint8_t *)str.data(), str.size());
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else
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std::cout << generateCode((const uint8_t *)str.data(), str.size()) << std::endl;
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return 0;
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}
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#endif
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