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afl-compiler-rt.o.c
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/*
american fuzzy lop++ - instrumentation bootstrap
------------------------------------------------
Copyright 2015, 2016 Google Inc. All rights reserved.
Copyright 2019-2024 AFLplusplus Project. All rights reserved.
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at:
https://www.apache.org/licenses/LICENSE-2.0
*/
#ifdef __AFL_CODE_COVERAGE
#ifndef _GNU_SOURCE
#define _GNU_SOURCE
#endif
#ifndef __USE_GNU
#define __USE_GNU
#endif
#include <dlfcn.h>
__attribute__((weak)) void __sanitizer_symbolize_pc(void *, const char *fmt,
char *out_buf,
size_t out_buf_size);
#endif
#ifdef __ANDROID__
#include "android-ashmem.h"
#endif
#include "config.h"
#include "types.h"
#include "cmplog.h"
#include "llvm-alternative-coverage.h"
#define XXH_INLINE_ALL
#include "xxhash.h"
#undef XXH_INLINE_ALL
#include <stdio.h>
#include <stdlib.h>
#include <signal.h>
#include <unistd.h>
#include <string.h>
#include <assert.h>
#include <stdint.h>
#include <stddef.h>
#include <limits.h>
#include <errno.h>
#include <sys/mman.h>
#if !defined(__HAIKU__) && !defined(__OpenBSD__)
#include <sys/syscall.h>
#endif
#ifndef USEMMAP
#include <sys/shm.h>
#endif
#include <sys/wait.h>
#include <sys/types.h>
#if !__GNUC__
#include "llvm/Config/llvm-config.h"
#endif
#ifdef __linux__
#include "snapshot-inl.h"
#endif
/* This is a somewhat ugly hack for the experimental 'trace-pc-guard' mode.
Basically, we need to make sure that the forkserver is initialized after
the LLVM-generated runtime initialization pass, not before. */
#ifndef MAP_FIXED_NOREPLACE
#ifdef MAP_EXCL
#define MAP_FIXED_NOREPLACE MAP_EXCL | MAP_FIXED
#else
#define MAP_FIXED_NOREPLACE MAP_FIXED
#endif
#endif
#define CTOR_PRIO 3
#define EARLY_FS_PRIO 5
#include <sys/mman.h>
#include <fcntl.h>
/* Globals needed by the injected instrumentation. The __afl_area_initial region
is used for instrumentation output before __afl_map_shm() has a chance to
run. It will end up as .comm, so it shouldn't be too wasteful. */
#if defined(__HAIKU__)
extern ssize_t _kern_write(int fd, off_t pos, const void *buffer,
size_t bufferSize);
#endif // HAIKU
char *strcasestr(const char *haystack, const char *needle);
static u8 __afl_area_initial[MAP_INITIAL_SIZE];
static u8 *__afl_area_ptr_dummy = __afl_area_initial;
static u8 *__afl_area_ptr_backup = __afl_area_initial;
u8 *__afl_area_ptr = __afl_area_initial;
u8 *__afl_dictionary;
u8 *__afl_fuzz_ptr;
static u32 __afl_fuzz_len_dummy;
u32 *__afl_fuzz_len = &__afl_fuzz_len_dummy;
int __afl_sharedmem_fuzzing __attribute__((weak));
u32 __afl_final_loc;
u32 __afl_map_size = MAP_SIZE;
u32 __afl_dictionary_len;
u64 __afl_map_addr;
u32 __afl_first_final_loc;
#ifdef __AFL_CODE_COVERAGE
typedef struct afl_module_info_t afl_module_info_t;
struct afl_module_info_t {
// A unique id starting with 0
u32 id;
// Name and base address of the module
char *name;
uintptr_t base_address;
// PC Guard start/stop
u32 *start;
u32 *stop;
// PC Table begin/end
const uintptr_t *pcs_beg;
const uintptr_t *pcs_end;
u8 mapped;
afl_module_info_t *next;
};
typedef struct {
uintptr_t PC, PCFlags;
} PCTableEntry;
afl_module_info_t *__afl_module_info = NULL;
u32 __afl_pcmap_size = 0;
uintptr_t *__afl_pcmap_ptr = NULL;
typedef struct {
uintptr_t start;
u32 len;
} FilterPCEntry;
u32 __afl_filter_pcs_size = 0;
FilterPCEntry *__afl_filter_pcs = NULL;
u8 *__afl_filter_pcs_module = NULL;
#endif // __AFL_CODE_COVERAGE
/* 1 if we are running in afl, and the forkserver was started, else 0 */
u32 __afl_connected = 0;
// for the __AFL_COVERAGE_ON/__AFL_COVERAGE_OFF features to work:
int __afl_selective_coverage __attribute__((weak));
int __afl_selective_coverage_start_off __attribute__((weak));
static int __afl_selective_coverage_temp = 1;
#if defined(__ANDROID__) || defined(__HAIKU__) || defined(NO_TLS)
PREV_LOC_T __afl_prev_loc[NGRAM_SIZE_MAX];
PREV_LOC_T __afl_prev_caller[CTX_MAX_K];
u32 __afl_prev_ctx;
#else
__thread PREV_LOC_T __afl_prev_loc[NGRAM_SIZE_MAX];
__thread PREV_LOC_T __afl_prev_caller[CTX_MAX_K];
__thread u32 __afl_prev_ctx;
#endif
struct cmp_map *__afl_cmp_map;
struct cmp_map *__afl_cmp_map_backup;
/* Child pid? */
static s32 child_pid;
static void (*old_sigterm_handler)(int) = 0;
/* Running in persistent mode? */
static u8 is_persistent;
/* Are we in sancov mode? */
static u8 _is_sancov;
/* Debug? */
/*static*/ u32 __afl_debug;
/* Already initialized markers */
u32 __afl_already_initialized_shm;
u32 __afl_already_initialized_forkserver;
u32 __afl_already_initialized_first;
u32 __afl_already_initialized_second;
u32 __afl_already_initialized_early;
u32 __afl_already_initialized_init;
/* Dummy pipe for area_is_valid() */
static int __afl_dummy_fd[2] = {2, 2};
/* ensure we kill the child on termination */
static void at_exit(int signal) {
if (unlikely(child_pid > 0)) {
kill(child_pid, SIGKILL);
waitpid(child_pid, NULL, 0);
child_pid = -1;
}
_exit(0);
}
#define default_hash(a, b) XXH3_64bits(a, b)
/* Uninspired gcc plugin instrumentation */
void __afl_trace(const u32 x) {
PREV_LOC_T prev = __afl_prev_loc[0];
__afl_prev_loc[0] = (x >> 1);
u8 *p = &__afl_area_ptr[prev ^ x];
#if 1 /* enable for neverZero feature. */
#if __GNUC__
u8 c = __builtin_add_overflow(*p, 1, p);
*p += c;
#else
*p += 1 + ((u8)(1 + *p) == 0);
#endif
#else
++*p;
#endif
return;
}
/* Error reporting to forkserver controller */
static void send_forkserver_error(int error) {
u32 status;
if (!error || error > 0xffff) return;
status = (FS_OPT_ERROR | FS_OPT_SET_ERROR(error));
if (write(FORKSRV_FD + 1, (char *)&status, 4) != 4) { return; }
}
/* SHM fuzzing setup. */
static void __afl_map_shm_fuzz() {
char *id_str = getenv(SHM_FUZZ_ENV_VAR);
if (__afl_debug) {
fprintf(stderr, "DEBUG: fuzzcase shmem %s\n", id_str ? id_str : "none");
}
if (id_str) {
u8 *map = NULL;
#ifdef USEMMAP
const char *shm_file_path = id_str;
int shm_fd = -1;
/* create the shared memory segment as if it was a file */
shm_fd = shm_open(shm_file_path, O_RDWR, DEFAULT_PERMISSION);
if (shm_fd == -1) {
fprintf(stderr, "shm_open() failed for fuzz\n");
send_forkserver_error(FS_ERROR_SHM_OPEN);
exit(1);
}
map =
(u8 *)mmap(0, MAX_FILE + sizeof(u32), PROT_READ, MAP_SHARED, shm_fd, 0);
#else
u32 shm_id = atoi(id_str);
map = (u8 *)shmat(shm_id, NULL, 0);
#endif
/* Whooooops. */
if (!map || map == (void *)-1) {
perror("Could not access fuzzing shared memory");
send_forkserver_error(FS_ERROR_SHM_OPEN);
exit(1);
}
__afl_fuzz_len = (u32 *)map;
__afl_fuzz_ptr = map + sizeof(u32);
if (__afl_debug) {
fprintf(stderr, "DEBUG: successfully got fuzzing shared memory\n");
}
} else {
fprintf(stderr, "Error: variable for fuzzing shared memory is not set\n");
send_forkserver_error(FS_ERROR_SHM_OPEN);
exit(1);
}
}
/* SHM setup. */
static void __afl_map_shm(void) {
if (__afl_already_initialized_shm) return;
__afl_already_initialized_shm = 1;
// if we are not running in afl ensure the map exists
if (!__afl_area_ptr) { __afl_area_ptr = __afl_area_ptr_dummy; }
char *id_str = getenv(SHM_ENV_VAR);
if (__afl_final_loc) {
__afl_map_size = ++__afl_final_loc; // as we count starting 0
if (getenv("AFL_DUMP_MAP_SIZE")) {
printf("%u\n", __afl_map_size);
exit(-1);
}
if (__afl_final_loc > MAP_SIZE) {
char *ptr;
u32 val = 0;
if ((ptr = getenv("AFL_MAP_SIZE")) != NULL) { val = atoi(ptr); }
if (val < __afl_final_loc) {
if (__afl_final_loc > FS_OPT_MAX_MAPSIZE) {
if (!getenv("AFL_QUIET"))
fprintf(stderr,
"Error: AFL++ tools *require* to set AFL_MAP_SIZE to %u "
"to be able to run this instrumented program!\n",
__afl_final_loc);
if (id_str) {
send_forkserver_error(FS_ERROR_MAP_SIZE);
exit(-1);
}
} else {
if (__afl_final_loc > MAP_INITIAL_SIZE && !getenv("AFL_QUIET")) {
fprintf(stderr,
"Warning: AFL++ tools might need to set AFL_MAP_SIZE to %u "
"to be able to run this instrumented program if this "
"crashes!\n",
__afl_final_loc);
}
}
}
}
} else {
if (getenv("AFL_DUMP_MAP_SIZE")) {
printf("%u\n", MAP_SIZE);
exit(-1);
}
}
if (__afl_sharedmem_fuzzing && (!id_str || !getenv(SHM_FUZZ_ENV_VAR) ||
fcntl(FORKSRV_FD, F_GETFD) == -1 ||
fcntl(FORKSRV_FD + 1, F_GETFD) == -1)) {
if (__afl_debug) {
fprintf(stderr,
"DEBUG: running not inside afl-fuzz, disabling shared memory "
"testcases\n");
}
__afl_sharedmem_fuzzing = 0;
}
if (!id_str) {
u32 val = 0;
u8 *ptr;
if ((ptr = getenv("AFL_MAP_SIZE")) != NULL) { val = atoi(ptr); }
if (val > MAP_INITIAL_SIZE) {
__afl_map_size = val;
} else {
if (__afl_first_final_loc > MAP_INITIAL_SIZE) {
// done in second stage constructor
__afl_map_size = __afl_first_final_loc;
} else {
__afl_map_size = MAP_INITIAL_SIZE;
}
}
if (__afl_map_size > MAP_INITIAL_SIZE && __afl_final_loc < __afl_map_size) {
__afl_final_loc = __afl_map_size;
}
if (__afl_debug) {
fprintf(stderr, "DEBUG: (0) init map size is %u to %p\n", __afl_map_size,
__afl_area_ptr_dummy);
}
}
/* If we're running under AFL, attach to the appropriate region, replacing the
early-stage __afl_area_initial region that is needed to allow some really
hacky .init code to work correctly in projects such as OpenSSL. */
if (__afl_debug) {
fprintf(
stderr,
"DEBUG: (1) id_str %s, __afl_area_ptr %p, __afl_area_initial %p, "
"__afl_area_ptr_dummy %p, __afl_map_addr 0x%llx, MAP_SIZE %u, "
"__afl_final_loc %u, __afl_map_size %u, max_size_forkserver %u/0x%x\n",
id_str == NULL ? "<null>" : id_str, __afl_area_ptr, __afl_area_initial,
__afl_area_ptr_dummy, __afl_map_addr, MAP_SIZE, __afl_final_loc,
__afl_map_size, FS_OPT_MAX_MAPSIZE, FS_OPT_MAX_MAPSIZE);
}
if (id_str) {
if (__afl_area_ptr && __afl_area_ptr != __afl_area_initial &&
__afl_area_ptr != __afl_area_ptr_dummy) {
if (__afl_map_addr) {
munmap((void *)__afl_map_addr, __afl_final_loc);
} else {
free(__afl_area_ptr);
}
__afl_area_ptr = __afl_area_ptr_dummy;
}
#ifdef USEMMAP
const char *shm_file_path = id_str;
int shm_fd = -1;
unsigned char *shm_base = NULL;
/* create the shared memory segment as if it was a file */
shm_fd = shm_open(shm_file_path, O_RDWR, DEFAULT_PERMISSION);
if (shm_fd == -1) {
fprintf(stderr, "shm_open() failed\n");
send_forkserver_error(FS_ERROR_SHM_OPEN);
exit(1);
}
/* map the shared memory segment to the address space of the process */
if (__afl_map_addr) {
shm_base =
mmap((void *)__afl_map_addr, __afl_map_size, PROT_READ | PROT_WRITE,
MAP_FIXED_NOREPLACE | MAP_SHARED, shm_fd, 0);
} else {
shm_base = mmap(0, __afl_map_size, PROT_READ | PROT_WRITE, MAP_SHARED,
shm_fd, 0);
}
close(shm_fd);
shm_fd = -1;
if (shm_base == MAP_FAILED) {
fprintf(stderr, "mmap() failed\n");
perror("mmap for map");
if (__afl_map_addr)
send_forkserver_error(FS_ERROR_MAP_ADDR);
else
send_forkserver_error(FS_ERROR_MMAP);
exit(2);
}
__afl_area_ptr = shm_base;
#else
u32 shm_id = atoi(id_str);
if (__afl_map_size && __afl_map_size > MAP_SIZE) {
u8 *map_env = (u8 *)getenv("AFL_MAP_SIZE");
if (!map_env || atoi((char *)map_env) < MAP_SIZE) {
fprintf(stderr, "FS_ERROR_MAP_SIZE\n");
send_forkserver_error(FS_ERROR_MAP_SIZE);
_exit(1);
}
}
__afl_area_ptr = (u8 *)shmat(shm_id, (void *)__afl_map_addr, 0);
/* Whooooops. */
if (!__afl_area_ptr || __afl_area_ptr == (void *)-1) {
if (__afl_map_addr)
send_forkserver_error(FS_ERROR_MAP_ADDR);
else
send_forkserver_error(FS_ERROR_SHMAT);
perror("shmat for map");
_exit(1);
}
#endif
/* Write something into the bitmap so that even with low AFL_INST_RATIO,
our parent doesn't give up on us. */
__afl_area_ptr[0] = 1;
} else if ((!__afl_area_ptr || __afl_area_ptr == __afl_area_initial) &&
__afl_map_addr) {
__afl_area_ptr = (u8 *)mmap(
(void *)__afl_map_addr, __afl_map_size, PROT_READ | PROT_WRITE,
MAP_FIXED_NOREPLACE | MAP_SHARED | MAP_ANONYMOUS, -1, 0);
if (__afl_area_ptr == MAP_FAILED) {
fprintf(stderr, "can not acquire mmap for address %p\n",
(void *)__afl_map_addr);
send_forkserver_error(FS_ERROR_SHM_OPEN);
exit(1);
}
} else if (__afl_final_loc > MAP_INITIAL_SIZE &&
__afl_final_loc > __afl_first_final_loc) {
if (__afl_area_initial != __afl_area_ptr_dummy) {
free(__afl_area_ptr_dummy);
}
__afl_area_ptr_dummy = (u8 *)malloc(__afl_final_loc);
__afl_area_ptr = __afl_area_ptr_dummy;
__afl_map_size = __afl_final_loc;
if (!__afl_area_ptr_dummy) {
fprintf(stderr,
"Error: AFL++ could not acquire %u bytes of memory, exiting!\n",
__afl_final_loc);
exit(-1);
}
} // else: nothing to be done
__afl_area_ptr_backup = __afl_area_ptr;
if (__afl_debug) {
fprintf(stderr,
"DEBUG: (2) id_str %s, __afl_area_ptr %p, __afl_area_initial %p, "
"__afl_area_ptr_dummy %p, __afl_map_addr 0x%llx, MAP_SIZE "
"%u, __afl_final_loc %u, __afl_map_size %u, "
"max_size_forkserver %u/0x%x\n",
id_str == NULL ? "<null>" : id_str, __afl_area_ptr,
__afl_area_initial, __afl_area_ptr_dummy, __afl_map_addr, MAP_SIZE,
__afl_final_loc, __afl_map_size, FS_OPT_MAX_MAPSIZE,
FS_OPT_MAX_MAPSIZE);
}
if (__afl_selective_coverage) {
if (__afl_map_size > MAP_INITIAL_SIZE) {
__afl_area_ptr_dummy = (u8 *)malloc(__afl_map_size);
if (__afl_area_ptr_dummy) {
if (__afl_selective_coverage_start_off) {
__afl_area_ptr = __afl_area_ptr_dummy;
}
} else {
fprintf(stderr, "Error: __afl_selective_coverage failed!\n");
__afl_selective_coverage = 0;
// continue;
}
}
}
id_str = getenv(CMPLOG_SHM_ENV_VAR);
if (__afl_debug) {
fprintf(stderr, "DEBUG: cmplog id_str %s\n",
id_str == NULL ? "<null>" : id_str);
}
if (id_str) {
// /dev/null doesn't work so we use /dev/urandom
if ((__afl_dummy_fd[1] = open("/dev/urandom", O_WRONLY)) < 0) {
if (pipe(__afl_dummy_fd) < 0) { __afl_dummy_fd[1] = 1; }
}
#ifdef USEMMAP
const char *shm_file_path = id_str;
int shm_fd = -1;
struct cmp_map *shm_base = NULL;
/* create the shared memory segment as if it was a file */
shm_fd = shm_open(shm_file_path, O_RDWR, DEFAULT_PERMISSION);
if (shm_fd == -1) {
perror("shm_open() failed\n");
send_forkserver_error(FS_ERROR_SHM_OPEN);
exit(1);
}
/* map the shared memory segment to the address space of the process */
shm_base = mmap(0, sizeof(struct cmp_map), PROT_READ | PROT_WRITE,
MAP_SHARED, shm_fd, 0);
if (shm_base == MAP_FAILED) {
close(shm_fd);
shm_fd = -1;
fprintf(stderr, "mmap() failed\n");
send_forkserver_error(FS_ERROR_SHM_OPEN);
exit(2);
}
__afl_cmp_map = shm_base;
#else
u32 shm_id = atoi(id_str);
__afl_cmp_map = (struct cmp_map *)shmat(shm_id, NULL, 0);
#endif
__afl_cmp_map_backup = __afl_cmp_map;
if (!__afl_cmp_map || __afl_cmp_map == (void *)-1) {
perror("shmat for cmplog");
send_forkserver_error(FS_ERROR_SHM_OPEN);
_exit(1);
}
}
#ifdef __AFL_CODE_COVERAGE
char *pcmap_id_str = getenv("__AFL_PCMAP_SHM_ID");
if (pcmap_id_str) {
__afl_pcmap_size = __afl_map_size * sizeof(void *);
u32 shm_id = atoi(pcmap_id_str);
__afl_pcmap_ptr = (uintptr_t *)shmat(shm_id, NULL, 0);
if (__afl_debug) {
fprintf(stderr, "DEBUG: Received %p via shmat for pcmap\n",
__afl_pcmap_ptr);
}
}
#endif // __AFL_CODE_COVERAGE
}
/* unmap SHM. */
static void __afl_unmap_shm(void) {
if (!__afl_already_initialized_shm) return;
#ifdef __AFL_CODE_COVERAGE
if (__afl_pcmap_size) {
shmdt((void *)__afl_pcmap_ptr);
__afl_pcmap_ptr = NULL;
__afl_pcmap_size = 0;
}
#endif // __AFL_CODE_COVERAGE
char *id_str = getenv(SHM_ENV_VAR);
if (id_str) {
#ifdef USEMMAP
munmap((void *)__afl_area_ptr, __afl_map_size);
#else
shmdt((void *)__afl_area_ptr);
#endif
} else if ((!__afl_area_ptr || __afl_area_ptr == __afl_area_initial) &&
__afl_map_addr) {
munmap((void *)__afl_map_addr, __afl_map_size);
}
__afl_area_ptr = __afl_area_ptr_dummy;
id_str = getenv(CMPLOG_SHM_ENV_VAR);
if (id_str) {
#ifdef USEMMAP
munmap((void *)__afl_cmp_map, __afl_map_size);
#else
shmdt((void *)__afl_cmp_map);
#endif
__afl_cmp_map = NULL;
__afl_cmp_map_backup = NULL;
}
__afl_already_initialized_shm = 0;
}
#define write_error(text) write_error_with_location(text, __FILE__, __LINE__)
void write_error_with_location(char *text, char *filename, int linenumber) {
u8 *o = getenv("__AFL_OUT_DIR");
char *e = strerror(errno);
if (o) {
char buf[4096];
snprintf(buf, sizeof(buf), "%s/error.txt", o);
FILE *f = fopen(buf, "a");
if (f) {
fprintf(f, "File %s, line %d: Error(%s): %s\n", filename, linenumber,
text, e);
fclose(f);
}
}
fprintf(stderr, "File %s, line %d: Error(%s): %s\n", filename, linenumber,
text, e);
}
#ifdef __linux__
static void __afl_start_snapshots(void) {
static u8 tmp[4] = {0, 0, 0, 0};
u32 status = 0;
u32 already_read_first = 0;
u32 was_killed;
u8 child_stopped = 0;
void (*old_sigchld_handler)(int) = signal(SIGCHLD, SIG_DFL);
/* Phone home and tell the parent that we're OK. If parent isn't there,
assume we're not running in forkserver mode and just execute program. */
status |= (FS_OPT_ENABLED | FS_OPT_SNAPSHOT | FS_OPT_NEWCMPLOG);
if (__afl_sharedmem_fuzzing) { status |= FS_OPT_SHDMEM_FUZZ; }
if (__afl_map_size <= FS_OPT_MAX_MAPSIZE)
status |= (FS_OPT_SET_MAPSIZE(__afl_map_size) | FS_OPT_MAPSIZE);
if (__afl_dictionary_len && __afl_dictionary) { status |= FS_OPT_AUTODICT; }
memcpy(tmp, &status, 4);
if (write(FORKSRV_FD + 1, tmp, 4) != 4) { return; }
if (__afl_sharedmem_fuzzing || (__afl_dictionary_len && __afl_dictionary)) {
if (read(FORKSRV_FD, &was_killed, 4) != 4) {
write_error("read to afl-fuzz");
_exit(1);
}
if (__afl_debug) {
fprintf(stderr, "DEBUG: target forkserver recv: %08x\n", was_killed);
}
if ((was_killed & (FS_OPT_ENABLED | FS_OPT_SHDMEM_FUZZ)) ==
(FS_OPT_ENABLED | FS_OPT_SHDMEM_FUZZ)) {
__afl_map_shm_fuzz();
}
if ((was_killed & (FS_OPT_ENABLED | FS_OPT_AUTODICT)) ==
(FS_OPT_ENABLED | FS_OPT_AUTODICT) &&
__afl_dictionary_len && __afl_dictionary) {
// great lets pass the dictionary through the forkserver FD
u32 len = __afl_dictionary_len, offset = 0;
s32 ret;
if (write(FORKSRV_FD + 1, &len, 4) != 4) {
write(2, "Error: could not send dictionary len\n",
strlen("Error: could not send dictionary len\n"));
_exit(1);
}
while (len != 0) {
ret = write(FORKSRV_FD + 1, __afl_dictionary + offset, len);
if (ret < 1) {
write(2, "Error: could not send dictionary\n",
strlen("Error: could not send dictionary\n"));
_exit(1);
}
len -= ret;
offset += ret;
}
} else {
// uh this forkserver does not understand extended option passing
// or does not want the dictionary
if (!__afl_fuzz_ptr) already_read_first = 1;
}
}
while (1) {
int status;
if (already_read_first) {
already_read_first = 0;
} else {
/* Wait for parent by reading from the pipe. Abort if read fails. */
if (read(FORKSRV_FD, &was_killed, 4) != 4) {
write_error("reading from afl-fuzz");
_exit(1);
}
}
#ifdef _AFL_DOCUMENT_MUTATIONS
if (__afl_fuzz_ptr) {
static uint32_t counter = 0;
char fn[32];
sprintf(fn, "%09u:forkserver", counter);
s32 fd_doc = open(fn, O_WRONLY | O_CREAT | O_TRUNC, DEFAULT_PERMISSION);
if (fd_doc >= 0) {
if (write(fd_doc, __afl_fuzz_ptr, *__afl_fuzz_len) != *__afl_fuzz_len) {
fprintf(stderr, "write of mutation file failed: %s\n", fn);
unlink(fn);
}
close(fd_doc);
}
counter++;
}
#endif
/* If we stopped the child in persistent mode, but there was a race
condition and afl-fuzz already issued SIGKILL, write off the old
process. */
if (child_stopped && was_killed) {
child_stopped = 0;
if (waitpid(child_pid, &status, 0) < 0) {