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#include <errno.h>
#include <fcntl.h>
#include <inttypes.h>
#include <limits.h>
#include <signal.h>
#include <stdbool.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/mman.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 "libhfuzz/fetch.h"
#include "libhfuzz/instrument.h"
#include "libhfuzz/libhfuzz.h"
#include "libhfuzz/performance.h"
__attribute__((weak)) int LLVMFuzzerInitialize(
int* argc HF_ATTR_UNUSED, char*** argv HF_ATTR_UNUSED) {
return 1;
}
__attribute__((weak)) size_t LLVMFuzzerMutate(
uint8_t* Data HF_ATTR_UNUSED, size_t Size HF_ATTR_UNUSED, size_t MaxSize HF_ATTR_UNUSED) {
LOG_F("LLVMFuzzerMutate() is not supported in honggfuzz yet");
return 0;
}
__attribute__((weak)) int LLVMFuzzerTestOneInput(
const uint8_t* buf HF_ATTR_UNUSED, size_t len HF_ATTR_UNUSED) {
LOG_F("Define 'int LLVMFuzzerTestOneInput(uint8_t * buf, size_t len)' in your "
"code to make it work");
return 0;
}
static const uint8_t* inputFile = NULL;
__attribute__((constructor)) static void initializePersistent(void) {
if (fcntl(_HF_INPUT_FD, F_GETFD) == -1 && errno == EBADF) {
return;
}
int mflags = files_getTmpMapFlags(MAP_SHARED, /* nocore= */ false);
if ((inputFile = mmap(NULL, _HF_INPUT_MAX_SIZE, PROT_READ, mflags, _HF_INPUT_FD, 0)) ==
MAP_FAILED) {
PLOG_F("mmap(fd=%d, size=%zu) of the input file failed", _HF_INPUT_FD,
(size_t)_HF_INPUT_MAX_SIZE);
}
}
void HF_ITER(const uint8_t** buf_ptr, size_t* len_ptr) {
HonggfuzzFetchData(buf_ptr, len_ptr);
}
extern const char* const LIBHFUZZ_module_memorycmp;
extern const char* const LIBHFUZZ_module_instrument;
static void HonggfuzzRunOneInput(const uint8_t* buf, size_t len) {
instrumentResetLocalCovFeedback();
int ret = LLVMFuzzerTestOneInput(buf, len);
if (ret != 0) {
LOG_D("Dereferenced: %s, %s", LIBHFUZZ_module_memorycmp, LIBHFUZZ_module_instrument);
LOG_F("LLVMFuzzerTestOneInput() returned '%d' instead of '0'", ret);
}
instrument8BitCountersCount();
}
static void HonggfuzzPersistentLoop(void) {
for (;;) {
size_t len;
const uint8_t* buf;
/* Check whether the current benchmark is fast enough, or maybe we should restart it */
performanceCheck();
HonggfuzzFetchData(&buf, &len);
HonggfuzzRunOneInput(buf, len);
}
}
static int HonggfuzzRunFromFile(int argc, char** argv) {
int in_fd = STDIN_FILENO;
const char* fname = "[STDIN]";
if (argc > 1) {
fname = argv[argc - 1];
if ((in_fd = TEMP_FAILURE_RETRY(open(argv[argc - 1], O_RDONLY))) == -1) {
PLOG_W("Cannot open '%s' as input, using stdin", argv[argc - 1]);
in_fd = STDIN_FILENO;
fname = "[STDIN]";
}
}
LOG_I("Accepting input from '%s'", fname);
LOG_I("Usage for fuzzing: honggfuzz -P [flags] -- %s", argv[0]);
uint8_t* buf = (uint8_t*)util_Calloc(_HF_INPUT_MAX_SIZE);
ssize_t len = files_readFromFd(in_fd, buf, _HF_INPUT_MAX_SIZE);
if (len < 0) {
LOG_E("Couldn't read data from stdin: %s", strerror(errno));
free(buf);
return -1;
}
HonggfuzzRunOneInput(buf, len);
free(buf);
return 0;
}
int HonggfuzzMain(int argc, char** argv) {
LLVMFuzzerInitialize(&argc, &argv);
instrumentClearNewCov();
if (!fetchIsInputAvailable()) {
return HonggfuzzRunFromFile(argc, argv);
}
HonggfuzzPersistentLoop();
return 0;
}
/*
* Declare it 'weak', so it can be safely linked with regular binaries which
* implement their own main()
*/
#if !defined(__CYGWIN__)
__attribute__((weak))
#endif /* !defined(__CYGWIN__) */
int main(int argc, char** argv) {
return HonggfuzzMain(argc, argv);
}
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