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This commit is contained in:
Rumata888 2020-11-12 01:29:17 +03:00
parent 20a8a93fd1
commit bb218b330f
3 changed files with 81 additions and 51 deletions
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69
custom_mutators/symcc/symcc.c
View File

@ -98,60 +98,74 @@ void afl_custom_queue_new_entry(my_mutator_t * data,
const uint8_t *filename_new_queue,
const uint8_t *filename_orig_queue) {
int pipefd[2];
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)) {
PFATAL("Couldn't find enqueued file: %s",fn);
PFATAL("Couldn't find enqueued file: %s", fn);
}
if (afl_struct->fsrv.use_stdin){
if (pipe(pipefd)==-1)
{
exit(-1);
}
if (afl_struct->fsrv.use_stdin) {
if (pipe(pipefd) == -1) { exit(-1); }
}
int pid = fork();
if (pid == -1) return;
if (pid){
if (afl_struct->fsrv.use_stdin){
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);
if (r <= 0) return;
close(fd);
if (r>fcntl(pipefd[1],F_GETPIPE_SZ)) fcntl(pipefd[1],F_SETPIPE_SZ,MAX_FILE);
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 {
PFATAL("Something happened to the enqueued file before sending its contents to symcc binary");
PFATAL(
"Something happened to the enqueued file before sending its "
"contents to symcc binary");
}
close(pipefd[1]);
ck_free(fn);
}
pid = waitpid(pid,NULL, 0);
pid = waitpid(pid, NULL, 0);
}
if (pid == 0) {
if (afl_struct->fsrv.use_stdin) {
unsetenv("SYMCC_INPUT_FILE");
close(pipefd[1]);
dup2(pipefd[0],0);
}
else
{
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);
@ -208,8 +222,8 @@ size_t afl_custom_fuzz(my_mutator_t *data, uint8_t *buf, size_t buf_size,
struct dirent **nl;
int32_t i, done = 0, items = scandir(data->out_dir, &nl, NULL, NULL);
ssize_t size = 0;
ssize_t size = 0;
if (items <= 0) return 0;
for (i = 0; i < (u32)items; ++i) {
@ -224,6 +238,7 @@ size_t afl_custom_fuzz(my_mutator_t *data, uint8_t *buf, size_t buf_size,
int fd = open(fn, O_RDONLY);
if (fd >= 0) {
size = read(fd, data->mutator_buf, max_size);
*out_buf = data->mutator_buf;

27
custom_mutators/symcc/test_examples/file_test.c
View File

@ -4,24 +4,33 @@
#include <unistd.h>
#include <fcntl.h>
int main(int argc, char** argv){
if (argc<2){
int main(int argc, char **argv) {
if (argc < 2) {
printf("Need a file argument\n");
return 1;
}
int fd=open(argv[1],O_RDONLY);
if (fd<0){
int fd = open(argv[1], O_RDONLY);
if (fd < 0) {
printf("Couldn't open file\n");
return 1;
}
uint32_t value = 0;
read(fd,&value,sizeof(value));
read(fd, &value, sizeof(value));
close(fd);
value=value^0xffffffff;
if (value== 0x11223344) printf("Value one\n");
value = value ^ 0xffffffff;
if (value == 0x11223344) printf("Value one\n");
if (value == 0x44332211) printf("Value two\n");
if (value != 0x0) printf("Not zero\n");
return 0;
return 0;
}

36
custom_mutators/symcc/test_examples/stdin_test.c
View File

@ -3,20 +3,26 @@
#include <stdlib.h>
#include <unistd.h>
int main(int argc, char** argv)
{
char input_buffer[16];
uint32_t comparisonValue;
size_t bytesRead;
bytesRead=read(STDIN_FILENO,input_buffer, sizeof(input_buffer));
if (bytesRead < 0) exit(-1);
comparisonValue=*(uint32_t*)input_buffer;
comparisonValue=comparisonValue^0xff112233;
if (comparisonValue==0x66554493){
int main(int argc, char **argv) {
char input_buffer[16];
uint32_t comparisonValue;
size_t bytesRead;
bytesRead = read(STDIN_FILENO, input_buffer, sizeof(input_buffer));
if (bytesRead < 0) exit(-1);
comparisonValue = *(uint32_t *)input_buffer;
comparisonValue = comparisonValue ^ 0xff112233;
if (comparisonValue == 0x66554493) {
printf("First value\n");
}
else{
if (comparisonValue==0x84444415) printf("Second value\n");
}
return 0;
} else {
if (comparisonValue == 0x84444415) printf("Second value\n");
}
return 0;
}