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hfuzz-cc.c
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hfuzz-cc.c
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#include <errno.h>
#include <fcntl.h>
#include <inttypes.h>
#include <libgen.h>
#include <limits.h>
#include <stdbool.h>
#include <stddef.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <unistd.h>
#include "honggfuzz.h"
#include "libhfcommon/common.h"
#include "libhfcommon/files.h"
#include "libhfcommon/log.h"
#include "libhfcommon/util.h"
#define ARGS_MAX 4096
static bool isCXX = false;
static bool isGCC = false;
static bool usePCGuard = true;
static bool hasCmdLineFSanitizeFuzzer = false;
/* Embed libhf/.a inside this binary */
__asm__("\n"
#if !defined(_HF_ARCH_DARWIN) && !defined(__APPLE__)
" .section .rodata\n"
#endif /* _HF_ARCH_DARWIN */
" .global lhfuzz_start\n"
" .global lhfuzz_end\n"
"lhfuzz_start:\n"
" .incbin \"libhfuzz/libhfuzz.a\"\n"
"lhfuzz_end:\n"
"\n"
" .global lhfnetdriver_start\n"
" .global lhfnetdriver_end\n"
"lhfnetdriver_start:\n"
" .incbin \"libhfnetdriver/libhfnetdriver.a\"\n"
"lhfnetdriver_end:\n"
"\n"
" .global lhfcommon_start\n"
" .global lhfcommon_end\n"
"lhfcommon_start:\n"
" .incbin \"libhfcommon/libhfcommon.a\"\n"
"lhfcommon_end:\n"
"\n");
static const char* _basename(const char* path) {
static __thread char fname[PATH_MAX];
/* basename() can modify the argument (sic!) */
snprintf(fname, sizeof(fname), "%s", path);
return basename(fname);
}
static bool useASAN() {
if (getenv("HFUZZ_CC_ASAN")) {
return true;
}
return false;
}
static bool useMSAN() {
if (getenv("HFUZZ_CC_MSAN")) {
return true;
}
return false;
}
static bool useUBSAN() {
if (getenv("HFUZZ_CC_UBSAN")) {
return true;
}
return false;
}
static bool useM32() {
if (getenv("HFUZZ_FORCE_M32")) {
return true;
}
return false;
}
static bool useBelowGCC8() {
if (getenv("HFUZZ_CC_USE_GCC_BELOW_8")) {
return true;
}
return false;
}
static bool isVersionMode(int argc, char** argv) {
for (int i = 1; i < argc; i++) {
if (strcmp(argv[i], "--version") == 0) {
return true;
}
if (strcmp(argv[i], "--target-help") == 0) {
return true;
}
if (strcmp(argv[i], "--help") == 0) {
return true;
}
}
return false;
}
static bool isLDMode(int argc, char** argv) {
for (int i = 1; i < argc; i++) {
if (strcmp(argv[i], "--version") == 0) {
return false;
}
if (strcmp(argv[i], "--target-help") == 0) {
return false;
}
if (strcmp(argv[i], "-c") == 0) {
return false;
}
if (strcmp(argv[i], "-E") == 0) {
return false;
}
if (strcmp(argv[i], "-S") == 0) {
return false;
}
}
return true;
}
static bool hasFSanitizeFuzzer(int argc, char** argv) {
for (int i = 1; i < argc; i++) {
if (util_strStartsWith(argv[i], "-fsanitize=") && strstr(argv[i], "fuzzer")) {
return true;
}
}
return false;
}
static int hf_execvp(const char* file, char** argv) {
argv[0] = (char*)file;
return execvp(file, argv);
}
static int execCC(int argc, char** argv) {
if (useASAN()) {
argv[argc++] = "-fsanitize=address";
}
if (useMSAN()) {
argv[argc++] = "-fsanitize=memory";
}
if (useUBSAN()) {
argv[argc++] = "-fsanitize=undefined";
argv[argc++] = "-fno-sanitize-recover=undefined";
}
argv[argc] = NULL;
if (isCXX) {
const char* cxx_path = getenv("HFUZZ_CXX_PATH");
if (cxx_path != NULL) {
hf_execvp(cxx_path, argv);
PLOG_E("execvp('%s')", cxx_path);
return EXIT_FAILURE;
}
} else {
const char* cc_path = getenv("HFUZZ_CC_PATH");
if (cc_path != NULL) {
hf_execvp(cc_path, argv);
PLOG_E("execvp('%s')", cc_path);
return EXIT_FAILURE;
}
}
if (isGCC) {
if (isCXX) {
hf_execvp("g++", argv);
hf_execvp("gcc", argv);
} else {
hf_execvp("gcc", argv);
}
} else {
if (isCXX) {
/* Try the default one, then the newest ones (hopefully) in order */
hf_execvp("clang++", argv);
hf_execvp("clang++-18.0", argv);
hf_execvp("clang++-18", argv);
hf_execvp("clang++-17.0", argv);
hf_execvp("clang++-17", argv);
hf_execvp("clang++-16.0", argv);
hf_execvp("clang++-16", argv);
hf_execvp("clang++-15.0", argv);
hf_execvp("clang++-15", argv);
hf_execvp("clang++-14.0", argv);
hf_execvp("clang++-14", argv);
hf_execvp("clang++-13.0", argv);
hf_execvp("clang++-13", argv);
hf_execvp("clang++-12.0", argv);
hf_execvp("clang++-12", argv);
hf_execvp("clang++12", argv);
hf_execvp("clang++-11.0", argv);
hf_execvp("clang++-11", argv);
hf_execvp("clang++11", argv);
hf_execvp("clang++-10.0", argv);
hf_execvp("clang++-10", argv);
hf_execvp("clang++10", argv);
hf_execvp("clang++-9.0", argv);
hf_execvp("clang++-9", argv);
hf_execvp("clang++9", argv);
hf_execvp("clang++-8.0", argv);
hf_execvp("clang++-8", argv);
hf_execvp("clang++8", argv);
hf_execvp("clang++-7.0", argv);
hf_execvp("clang++-7", argv);
hf_execvp("clang++7", argv);
hf_execvp("clang", argv);
hf_execvp("clang++", argv);
} else {
/* Try the default one, then the newest ones (hopefully) in order */
hf_execvp("clang", argv);
hf_execvp("clang-18.0", argv);
hf_execvp("clang-18", argv);
hf_execvp("clang-17.0", argv);
hf_execvp("clang-17", argv);
hf_execvp("clang-16.0", argv);
hf_execvp("clang-16", argv);
hf_execvp("clang-15.0", argv);
hf_execvp("clang-15", argv);
hf_execvp("clang-14.0", argv);
hf_execvp("clang-14", argv);
hf_execvp("clang-13.0", argv);
hf_execvp("clang-13", argv);
hf_execvp("clang-12.0", argv);
hf_execvp("clang-12", argv);
hf_execvp("clang12", argv);
hf_execvp("clang-11.0", argv);
hf_execvp("clang-11", argv);
hf_execvp("clang11", argv);
hf_execvp("clang-10.0", argv);
hf_execvp("clang-10", argv);
hf_execvp("clang10", argv);
hf_execvp("clang-9.0", argv);
hf_execvp("clang-9", argv);
hf_execvp("clang9", argv);
hf_execvp("clang-8.0", argv);
hf_execvp("clang-8", argv);
hf_execvp("clang8", argv);
hf_execvp("clang-7.0", argv);
hf_execvp("clang-7", argv);
hf_execvp("clang7", argv);
hf_execvp("clang", argv);
}
}
PLOG_F("execvp('%s')", argv[0]);
return EXIT_FAILURE;
}
/* It'll point back to the libhfuzz's source tree */
char* getIncPaths(void) {
#if !defined(_HFUZZ_INC_PATH)
#error \
"You need to define _HFUZZ_INC_PATH to a directory with the directory called 'includes', containing honggfuzz's lib* includes. Typically it'd be the build/sources dir"
#endif
static char path[PATH_MAX];
snprintf(path, sizeof(path), "-I%s/includes/", HF_XSTR(_HFUZZ_INC_PATH));
return path;
}
static bool getLibPath(
const char* name, const char* env, const uint8_t* start, const uint8_t* end, char* path) {
const char* libEnvLoc = getenv(env);
if (libEnvLoc) {
snprintf(path, PATH_MAX, "%s", libEnvLoc);
return true;
}
ptrdiff_t len = (uintptr_t)end - (uintptr_t)start;
uint64_t crc64 = util_CRC64(start, len);
snprintf(path, PATH_MAX, "/tmp/%s.%d.%" PRIx64 ".a", name, geteuid(), crc64);
/* Does the library exist, belongs to the user, and is of expected size? */
struct stat st;
if (stat(path, &st) != -1 && st.st_size == len && st.st_uid == geteuid()) {
return true;
}
/* If not, create it with atomic rename() */
char template[] = "/tmp/lib.honggfuzz.a.XXXXXX";
int fd = TEMP_FAILURE_RETRY(mkostemp(template, O_CLOEXEC));
if (fd == -1) {
PLOG_E("mkostemp('%s')", template);
return false;
}
defer {
close(fd);
};
if (!files_writeToFd(fd, start, len)) {
PLOG_E("Couldn't write to '%s'", template);
unlink(template);
return false;
}
if (TEMP_FAILURE_RETRY(rename(template, path)) == -1) {
PLOG_E("Couldn't rename('%s', '%s')", template, path);
unlink(template);
return false;
}
return true;
}
static char* getLibHFuzzPath() {
extern uint8_t lhfuzz_start __asm__("lhfuzz_start");
extern uint8_t lhfuzz_end __asm__("lhfuzz_end");
static char path[PATH_MAX] = {};
if (path[0]) {
return path;
}
if (!getLibPath("libhfuzz", "HFUZZ_LHFUZZ_PATH", &lhfuzz_start, &lhfuzz_end, path)) {
LOG_F("Couldn't create the temporary libhfuzz.a");
}
return path;
}
static char* getLibHFNetDriverPath() {
extern uint8_t lhfnetdriver_start __asm__("lhfnetdriver_start");
extern uint8_t lhfnetdriver_end __asm__("lhfnetdriver_end");
static char path[PATH_MAX] = {};
if (path[0]) {
return path;
}
if (!getLibPath("libhfnetdriver", "HFUZZ_LHFNETDRIVER_PATH", &lhfnetdriver_start,
&lhfnetdriver_end, path)) {
LOG_F("Couldn't create the temporary libhfnetdriver.a");
}
return path;
}
static char* getLibHFCommonPath() {
extern uint8_t lhfcommon_start __asm__("lhfcommon_start");
extern uint8_t lhfcommon_end __asm__("lhfcommon_end");
static char path[PATH_MAX] = {};
if (path[0]) {
return path;
}
if (!getLibPath(
"libhfcommon", "HFUZZ_LHFCOMMON_PATH", &lhfcommon_start, &lhfcommon_end, path)) {
LOG_F("Couldn't create the temporary libhcommon.a");
}
return path;
}
static void commonPreOpts(int* j, char** args) {
args[(*j)++] = getIncPaths();
if (!isGCC) {
args[(*j)++] = "-Wno-unused-command-line-argument";
}
/*
* Make the execution flow more explicit, allowing for more code blocks
* (and better code coverage estimates)
*/
if (isGCC) {
args[(*j)++] = "-finline-limit=1000";
} else {
args[(*j)++] = "-mllvm";
args[(*j)++] = "-inline-threshold=1000";
}
args[(*j)++] = "-fno-builtin";
args[(*j)++] = "-fno-omit-frame-pointer";
args[(*j)++] = "-D__NO_STRING_INLINES";
/* Make it possible to use the libhfnetdriver */
args[(*j)++] = "-DHFND_FUZZING_ENTRY_FUNCTION_CXX(x,y)="
"extern const char* LIBHFNETDRIVER_module_netdriver;"
"const char** LIBHFNETDRIVER_tmp1 = &LIBHFNETDRIVER_module_netdriver;"
"extern \"C\" int HonggfuzzNetDriver_main(x,y);"
"int HonggfuzzNetDriver_main(x,y)";
args[(*j)++] = "-DHFND_FUZZING_ENTRY_FUNCTION(x,y)="
"extern const char* LIBHFNETDRIVER_module_netdriver;"
"const char** LIBHFNETDRIVER_tmp1 = &LIBHFNETDRIVER_module_netdriver;"
"int HonggfuzzNetDriver_main(x,y);"
"int HonggfuzzNetDriver_main(x,y)";
if (useM32()) {
args[(*j)++] = "-m32";
}
}
static void commonPostOpts(int* j, char** args) {
if (isGCC) {
if (useBelowGCC8()) {
/* trace-pc is the best that gcc-6/7 currently offers */
args[(*j)++] = "-fsanitize-coverage=trace-pc";
} else {
/* gcc-8+ offers trace-cmp as well, but it's not that widely used yet */
args[(*j)++] = "-fsanitize-coverage=trace-pc,trace-cmp";
}
} else {
if (usePCGuard) {
if (hasCmdLineFSanitizeFuzzer) {
args[(*j)++] = "-fno-sanitize=fuzzer";
args[(*j)++] = "-fno-sanitize=fuzzer-no-link";
}
args[(*j)++] = "-fsanitize-coverage=trace-pc-guard,trace-cmp,trace-div,indirect-calls";
} else {
args[(*j)++] = "-fno-sanitize-coverage=trace-pc-guard";
args[(*j)++] = "-fno-sanitize=fuzzer";
args[(*j)++] = "-fsanitize=fuzzer-no-link";
args[(*j)++] = "-fsanitize-coverage=trace-cmp,trace-div,indirect-calls";
}
}
}
static int ccMode(int argc, char** argv) {
char* args[ARGS_MAX];
int j = 0;
if (isCXX) {
args[j++] = "c++";
} else {
args[j++] = "cc";
}
commonPreOpts(&j, args);
for (int i = 1; i < argc; i++) {
args[j++] = argv[i];
}
commonPostOpts(&j, args);
return execCC(j, args);
}
static int ldMode(int argc, char** argv) {
char* args[ARGS_MAX];
int j = 0;
if (isCXX) {
args[j++] = "c++";
} else {
args[j++] = "cc";
}
commonPreOpts(&j, args);
/* MacOS X linker doesn't like those */
#ifndef _HF_ARCH_DARWIN
/* Intercept common *cmp functions */
args[j++] = "-Wl,--wrap=strcmp";
args[j++] = "-Wl,--wrap=strcasecmp";
args[j++] = "-Wl,--wrap=stricmp";
args[j++] = "-Wl,--wrap=strncmp";
args[j++] = "-Wl,--wrap=strncasecmp";
args[j++] = "-Wl,--wrap=strnicmp";
args[j++] = "-Wl,--wrap=strstr";
args[j++] = "-Wl,--wrap=strcasestr";
args[j++] = "-Wl,--wrap=memcmp";
args[j++] = "-Wl,--wrap=bcmp";
args[j++] = "-Wl,--wrap=memmem";
args[j++] = "-Wl,--wrap=strcpy";
args[j++] = "-Wl,--wrap=strlcpy";
/* Apache httpd */
args[j++] = "-Wl,--wrap=ap_cstr_casecmp";
args[j++] = "-Wl,--wrap=ap_cstr_casecmpn";
args[j++] = "-Wl,--wrap=ap_strcasestr";
args[j++] = "-Wl,--wrap=apr_cstr_casecmp";
args[j++] = "-Wl,--wrap=apr_cstr_casecmpn";
/* *SSL */
args[j++] = "-Wl,--wrap=CRYPTO_memcmp";
args[j++] = "-Wl,--wrap=OPENSSL_memcmp";
args[j++] = "-Wl,--wrap=OPENSSL_strcasecmp";
args[j++] = "-Wl,--wrap=OPENSSL_strncasecmp";
args[j++] = "-Wl,--wrap=memcmpct";
/* libXML2 */
args[j++] = "-Wl,--wrap=xmlStrncmp";
args[j++] = "-Wl,--wrap=xmlStrcmp";
args[j++] = "-Wl,--wrap=xmlStrEqual";
args[j++] = "-Wl,--wrap=xmlStrcasecmp";
args[j++] = "-Wl,--wrap=xmlStrncasecmp";
args[j++] = "-Wl,--wrap=xmlStrstr";
args[j++] = "-Wl,--wrap=xmlStrcasestr";
/* Samba */
args[j++] = "-Wl,--wrap=memcmp_const_time";
args[j++] = "-Wl,--wrap=strcsequal";
/* LittleCMS */
args[j++] = "-Wl,--wrap=cmsstrcasecmp";
/* GLib */
args[j++] = "-Wl,--wrap=g_strcmp0";
args[j++] = "-Wl,--wrap=g_strcasecmp";
args[j++] = "-Wl,--wrap=g_strncasecmp";
args[j++] = "-Wl,--wrap=g_strstr_len";
args[j++] = "-Wl,--wrap=g_ascii_strcasecmp";
args[j++] = "-Wl,--wrap=g_ascii_strncasecmp";
args[j++] = "-Wl,--wrap=g_str_has_prefix";
args[j++] = "-Wl,--wrap=g_str_has_suffix";
/* CUrl */
args[j++] = "-Wl,--wrap=Curl_strcasecompare";
args[j++] = "-Wl,--wrap=curl_strequal";
args[j++] = "-Wl,--wrap=Curl_safe_strcasecompare";
args[j++] = "-Wl,--wrap=Curl_strncasecompare";
args[j++] = "-Wl,--wrap=curl_strnequal";
#endif /* _HF_ARCH_DARWIN */
/* Pull modules defining the following symbols (if they exist) */
#ifdef _HF_ARCH_DARWIN
args[j++] = "-Wl,-U,_HonggfuzzNetDriver_main";
args[j++] = "-Wl,-U,_LIBHFUZZ_module_instrument";
args[j++] = "-Wl,-U,_LIBHFUZZ_module_memorycmp";
#else /* _HF_ARCH_DARWIN */
args[j++] = "-Wl,-u,HonggfuzzNetDriver_main";
args[j++] = "-Wl,-u,LIBHFUZZ_module_instrument";
args[j++] = "-Wl,-u,LIBHFUZZ_module_memorycmp";
#endif /* _HF_ARCH_DARWIN */
for (int i = 1; i < argc; i++) {
args[j++] = argv[i];
}
/*
* Disable enforcement of the programming language, in case it had been enabled explicitly,
* e.g. via -xc
*/
args[j++] = "-xnone";
/* Reference standard honggfuzz libraries first (libhfuzz, libhfcommon and libhfnetdriver) */
args[j++] = getLibHFNetDriverPath();
args[j++] = getLibHFuzzPath();
args[j++] = getLibHFCommonPath();
/* Needed by libhfcommon */
args[j++] = "-pthread";
#if !defined(__NetBSD__)
args[j++] = "-ldl";
#endif /* !defined(__NetBSD__) */
#if !defined(_HF_ARCH_DARWIN) && !defined(__OpenBSD__)
args[j++] = "-lrt";
#endif /* !defined(_HF_ARCH_DARWIN) && !defined(__OpenBSD__) */
#if defined(__ANDROID__)
args[j++] = "-latomic";
#endif
commonPostOpts(&j, args);
return execCC(j, args);
}
static bool baseNameContains(const char* path, const char* str) {
if (strstr(_basename(path), str)) {
return true;
}
return false;
}
int main(int argc, char** argv) {
if (baseNameContains(argv[0], "++")) {
isCXX = true;
}
if (baseNameContains(argv[0], "-gcc")) {
isGCC = true;
}
if (baseNameContains(argv[0], "-g++")) {
isGCC = true;
}
if (baseNameContains(argv[0], "-pcguard-")) {
usePCGuard = true;
}
if (baseNameContains(argv[0], "-8bitcnt-")) {
usePCGuard = false;
}
hasCmdLineFSanitizeFuzzer = hasFSanitizeFuzzer(argc, argv);
if (argc <= 1) {
return execCC(argc, argv);
}
if (isVersionMode(argc, argv)) {
return execCC(argc, argv);
}
if (argc > (ARGS_MAX - 128)) {
LOG_F("'%s': Too many positional arguments: %d", argv[0], argc);
return EXIT_FAILURE;
}
if (isLDMode(argc, argv)) {
return ldMode(argc, argv);
}
return ccMode(argc, argv);
}