mirror of
https://github.com/AFLplusplus/AFLplusplus.git
synced 2025-06-08 00:01:33 +00:00
335 lines
6.8 KiB
C
335 lines
6.8 KiB
C
#define _GNU_SOURCE
|
|
#include <stdio.h>
|
|
#include <stdint.h>
|
|
#include <stdlib.h>
|
|
#include <string.h>
|
|
#include <unistd.h>
|
|
#include <fcntl.h>
|
|
#include "config.h"
|
|
#include "debug.h"
|
|
#include "afl-fuzz.h"
|
|
#include "common.h"
|
|
|
|
afl_state_t *afl_struct;
|
|
|
|
#ifdef DEBUG
|
|
#define DBG(x...) fprintf(stderr, x)
|
|
#else
|
|
#define DBG(x...) \
|
|
{}
|
|
#endif
|
|
|
|
typedef struct my_mutator {
|
|
|
|
afl_state_t *afl;
|
|
u8 *mutator_buf;
|
|
u8 *out_dir;
|
|
u8 *tmp_dir;
|
|
u8 *target;
|
|
uint32_t seed;
|
|
|
|
} my_mutator_t;
|
|
|
|
my_mutator_t *afl_custom_init(afl_state_t *afl, unsigned int seed) {
|
|
|
|
if (getenv("AFL_CUSTOM_MUTATOR_ONLY"))
|
|
FATAL("the symcc module cannot be used with AFL_CUSTOM_MUTATOR_ONLY.");
|
|
|
|
my_mutator_t *data = calloc(1, sizeof(my_mutator_t));
|
|
if (!data) {
|
|
|
|
perror("afl_custom_init alloc");
|
|
return NULL;
|
|
|
|
}
|
|
|
|
if ((data->mutator_buf = malloc(MAX_FILE)) == NULL) {
|
|
|
|
free(data);
|
|
perror("mutator_buf alloc");
|
|
return NULL;
|
|
|
|
}
|
|
|
|
if (!(data->target = getenv("SYMCC_TARGET")))
|
|
FATAL(
|
|
"SYMCC_TARGET not defined, this should point to the full path of the "
|
|
"symcc compiled binary.");
|
|
|
|
if (!(data->out_dir = getenv("SYMCC_OUTPUT_DIR"))) {
|
|
|
|
data->out_dir = alloc_printf("%s/symcc", afl->out_dir);
|
|
|
|
}
|
|
|
|
data->tmp_dir = alloc_printf("%s/tmp", data->out_dir);
|
|
setenv("SYMCC_OUTPUT_DIR", data->tmp_dir, 1);
|
|
int pid = fork();
|
|
|
|
if (pid == -1) return NULL;
|
|
|
|
if (pid) pid = waitpid(pid, NULL, 0);
|
|
|
|
if (pid == 0) {
|
|
|
|
char *args[4];
|
|
args[0] = "/bin/rm";
|
|
args[1] = "-rf";
|
|
args[2] = data->out_dir;
|
|
args[3] = NULL;
|
|
execvp(args[0], args);
|
|
DBG("exec:FAIL\n");
|
|
exit(-1);
|
|
|
|
}
|
|
|
|
data->afl = afl;
|
|
data->seed = seed;
|
|
afl_struct = afl;
|
|
|
|
if (mkdir(data->out_dir, 0755))
|
|
PFATAL("Could not create directory %s", data->out_dir);
|
|
|
|
if (mkdir(data->tmp_dir, 0755))
|
|
PFATAL("Could not create directory %s", data->tmp_dir);
|
|
|
|
DBG("out_dir=%s, target=%s\n", data->out_dir, data->target);
|
|
|
|
return data;
|
|
|
|
}
|
|
|
|
/* When a new queue entry is added we run this input with the symcc
|
|
instrumented binary */
|
|
uint8_t afl_custom_queue_new_entry(my_mutator_t *data,
|
|
const uint8_t *filename_new_queue,
|
|
const uint8_t *filename_orig_queue) {
|
|
|
|
int pipefd[2];
|
|
struct stat st;
|
|
ACTF("Queueing to symcc: %s", filename_new_queue);
|
|
u8 *fn = alloc_printf("%s", filename_new_queue);
|
|
if (!(stat(fn, &st) == 0 && S_ISREG(st.st_mode) && st.st_size)) {
|
|
|
|
ck_free(fn);
|
|
PFATAL("Couldn't find enqueued file: %s", fn);
|
|
|
|
}
|
|
|
|
if (afl_struct->fsrv.use_stdin) {
|
|
|
|
if (pipe(pipefd) == -1) {
|
|
|
|
ck_free(fn);
|
|
PFATAL("Couldn't create a pipe for interacting with symcc child process");
|
|
|
|
}
|
|
|
|
}
|
|
|
|
int pid = fork();
|
|
|
|
if (pid == -1) return 0;
|
|
|
|
if (pid) {
|
|
|
|
if (afl_struct->fsrv.use_stdin) {
|
|
|
|
close(pipefd[0]);
|
|
int fd = open(fn, O_RDONLY);
|
|
|
|
if (fd >= 0) {
|
|
|
|
ssize_t r = read(fd, data->mutator_buf, MAX_FILE);
|
|
DBG("fn=%s, fd=%d, size=%ld\n", fn, fd, r);
|
|
ck_free(fn);
|
|
close(fd);
|
|
if (r <= 0) {
|
|
|
|
close(pipefd[1]);
|
|
return 0;
|
|
|
|
}
|
|
|
|
if (r > fcntl(pipefd[1], F_GETPIPE_SZ))
|
|
fcntl(pipefd[1], F_SETPIPE_SZ, MAX_FILE);
|
|
ck_write(pipefd[1], data->mutator_buf, r, filename_new_queue);
|
|
|
|
} else {
|
|
|
|
ck_free(fn);
|
|
close(pipefd[1]);
|
|
PFATAL(
|
|
"Something happened to the enqueued file before sending its "
|
|
"contents to symcc binary");
|
|
|
|
}
|
|
|
|
close(pipefd[1]);
|
|
|
|
}
|
|
|
|
pid = waitpid(pid, NULL, 0);
|
|
|
|
// At this point we need to transfer files to output dir, since their names
|
|
// collide and symcc will just overwrite them
|
|
|
|
struct dirent **nl;
|
|
int32_t items = scandir(data->tmp_dir, &nl, NULL, NULL);
|
|
u8 *origin_name = basename(filename_new_queue);
|
|
int32_t i;
|
|
if (items > 0) {
|
|
|
|
for (i = 0; i < (u32)items; ++i) {
|
|
|
|
struct stat st;
|
|
u8 *source_name = alloc_printf("%s/%s", data->tmp_dir, nl[i]->d_name);
|
|
DBG("test=%s\n", fn);
|
|
if (stat(source_name, &st) == 0 && S_ISREG(st.st_mode) && st.st_size) {
|
|
|
|
u8 *destination_name = alloc_printf("%s/%s.%s", data->out_dir,
|
|
origin_name, nl[i]->d_name);
|
|
rename(source_name, destination_name);
|
|
ck_free(destination_name);
|
|
DBG("found=%s\n", source_name);
|
|
|
|
}
|
|
|
|
ck_free(source_name);
|
|
free(nl[i]);
|
|
|
|
}
|
|
|
|
free(nl);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
if (pid == 0) {
|
|
|
|
if (afl_struct->fsrv.use_stdin) {
|
|
|
|
unsetenv("SYMCC_INPUT_FILE");
|
|
close(pipefd[1]);
|
|
dup2(pipefd[0], 0);
|
|
|
|
} else {
|
|
|
|
setenv("SYMCC_INPUT_FILE", afl_struct->fsrv.out_file, 1);
|
|
|
|
}
|
|
|
|
DBG("exec=%s\n", data->target);
|
|
close(1);
|
|
close(2);
|
|
dup2(afl_struct->fsrv.dev_null_fd, 1);
|
|
dup2(afl_struct->fsrv.dev_null_fd, 2);
|
|
|
|
execvp(data->target, afl_struct->argv);
|
|
DBG("exec=FAIL\n");
|
|
exit(-1);
|
|
|
|
}
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
uint32_t afl_custom_fuzz_count(my_mutator_t *data, const u8 *buf,
|
|
size_t buf_size) {
|
|
|
|
uint32_t count = 0, i;
|
|
struct dirent **nl;
|
|
int32_t items = scandir(data->out_dir, &nl, NULL, NULL);
|
|
|
|
if (items > 0) {
|
|
|
|
for (i = 0; i < (u32)items; ++i) {
|
|
|
|
struct stat st;
|
|
u8 *fn = alloc_printf("%s/%s", data->out_dir, nl[i]->d_name);
|
|
DBG("test=%s\n", fn);
|
|
if (stat(fn, &st) == 0 && S_ISREG(st.st_mode) && st.st_size) {
|
|
|
|
DBG("found=%s\n", fn);
|
|
count++;
|
|
|
|
}
|
|
|
|
ck_free(fn);
|
|
free(nl[i]);
|
|
|
|
}
|
|
|
|
free(nl);
|
|
|
|
}
|
|
|
|
DBG("dir=%s, count=%u\n", data->out_dir, count);
|
|
return count;
|
|
|
|
}
|
|
|
|
/* here we actually just read the files generated from symcc */
|
|
size_t afl_custom_fuzz(my_mutator_t *data, uint8_t *buf, size_t buf_size,
|
|
u8 **out_buf, uint8_t *add_buf, size_t add_buf_size,
|
|
size_t max_size) {
|
|
|
|
struct dirent **nl;
|
|
int32_t i, done = 0, items = scandir(data->out_dir, &nl, NULL, NULL);
|
|
ssize_t size = 0;
|
|
|
|
if (items <= 0) return 0;
|
|
|
|
for (i = 0; i < (s32)items; ++i) {
|
|
|
|
if (!done) {
|
|
|
|
struct stat st;
|
|
u8 *fn = alloc_printf("%s/%s", data->out_dir, nl[i]->d_name);
|
|
|
|
if (stat(fn, &st) == 0 && S_ISREG(st.st_mode) && st.st_size) {
|
|
|
|
int fd = open(fn, O_RDONLY);
|
|
|
|
if (fd >= 0) {
|
|
|
|
size = read(fd, data->mutator_buf, max_size);
|
|
*out_buf = data->mutator_buf;
|
|
|
|
close(fd);
|
|
done = 1;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
unlink(fn);
|
|
ck_free(fn);
|
|
|
|
}
|
|
|
|
free(nl[i]);
|
|
|
|
}
|
|
|
|
free(nl);
|
|
DBG("FUZZ size=%lu\n", size);
|
|
return (uint32_t)size;
|
|
|
|
}
|
|
|
|
/**
|
|
* Deinitialize everything
|
|
*
|
|
* @param data The data ptr from afl_custom_init
|
|
*/
|
|
void afl_custom_deinit(my_mutator_t *data) {
|
|
|
|
free(data->mutator_buf);
|
|
free(data);
|
|
|
|
}
|
|
|