blob: 3bf9de757fea61b1ef97c89c837dbd9f8266e628 [file] [log] [blame]
/*
*
* honggfuzz - routines dealing with subprocesses
* -----------------------------------------
*
* Author:
* Robert Swiecki <swiecki@google.com>
* Felix Gröbert <groebert@google.com>
*
* Copyright 2010-2015 by Google Inc. 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
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
* implied. See the License for the specific language governing
* permissions and limitations under the License.
*
*/
#include "common.h"
#include "subproc.h"
#include <fcntl.h>
#include <inttypes.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/resource.h>
#include <sys/socket.h>
#include <sys/time.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <unistd.h>
#include "arch.h"
#include "files.h"
#include "log.h"
#include "sancov.h"
#include "util.h"
extern char **environ;
const char *subproc_StatusToStr(int status, char *str, size_t len)
{
if (WIFEXITED(status)) {
snprintf(str, len, "EXITED, exit code: %d", WEXITSTATUS(status));
return str;
}
if (WIFSIGNALED(status)) {
snprintf(str, len, "SIGNALED, signal: %d (%s)", WTERMSIG(status),
strsignal(WTERMSIG(status)));
return str;
}
if (WIFCONTINUED(status)) {
snprintf(str, len, "CONTINUED");
return str;
}
if (!WIFSTOPPED(status)) {
snprintf(str, len, "UNKNOWN STATUS: %d", status);
return str;
}
/* Must be in a stopped state */
if (WSTOPSIG(status) == (SIGTRAP | 0x80)) {
snprintf(str, len, "STOPPED (linux syscall): %d (%s)", WSTOPSIG(status),
strsignal(WSTOPSIG(status)));
return str;
}
#if defined(PTRACE_EVENT_STOP)
#define __LINUX_WPTRACEEVENT(x) ((x & 0xff0000) >> 16)
if (WSTOPSIG(status) == SIGTRAP && __LINUX_WPTRACEEVENT(status) != 0) {
switch (__LINUX_WPTRACEEVENT(status)) {
case PTRACE_EVENT_FORK:
snprintf(str, len, "EVENT (Linux) - fork - with signal: %d (%s)", WSTOPSIG(status),
strsignal(WSTOPSIG(status)));
return str;
case PTRACE_EVENT_VFORK:
snprintf(str, len, "EVENT (Linux) - vfork - with signal: %d (%s)", WSTOPSIG(status),
strsignal(WSTOPSIG(status)));
return str;
case PTRACE_EVENT_CLONE:
snprintf(str, len, "EVENT (Linux) - clone - with signal: %d (%s)", WSTOPSIG(status),
strsignal(WSTOPSIG(status)));
return str;
case PTRACE_EVENT_EXEC:
snprintf(str, len, "EVENT (Linux) - exec - with signal: %d (%s)", WSTOPSIG(status),
strsignal(WSTOPSIG(status)));
return str;
case PTRACE_EVENT_VFORK_DONE:
snprintf(str, len, "EVENT (Linux) - vfork_done - with signal: %d (%s)",
WSTOPSIG(status), strsignal(WSTOPSIG(status)));
return str;
case PTRACE_EVENT_EXIT:
snprintf(str, len, "EVENT (Linux) - exit - with signal: %d (%s)", WSTOPSIG(status),
strsignal(WSTOPSIG(status)));
return str;
case PTRACE_EVENT_SECCOMP:
snprintf(str, len, "EVENT (Linux) - seccomp - with signal: %d (%s)", WSTOPSIG(status),
strsignal(WSTOPSIG(status)));
return str;
case PTRACE_EVENT_STOP:
snprintf(str, len, "EVENT (Linux) - stop - with signal: %d (%s)", WSTOPSIG(status),
strsignal(WSTOPSIG(status)));
return str;
default:
snprintf(str, len, "EVENT (Linux) UNKNOWN (%d): with signal: %d (%s)",
__LINUX_WPTRACEEVENT(status), WSTOPSIG(status), strsignal(WSTOPSIG(status)));
return str;
}
}
#endif /* defined(PTRACE_EVENT_STOP) */
snprintf(str, len, "STOPPED with signal: %d (%s)", WSTOPSIG(status),
strsignal(WSTOPSIG(status)));
return str;
}
bool subproc_PrepareExecv(honggfuzz_t * hfuzz, fuzzer_t * fuzzer, const char *fileName)
{
/*
* The address space limit. If big enough - roughly the size of RAM used
*/
if (hfuzz->asLimit) {
struct rlimit rl = {
.rlim_cur = hfuzz->asLimit * 1024ULL * 1024ULL,
.rlim_max = hfuzz->asLimit * 1024ULL * 1024ULL,
};
if (setrlimit(RLIMIT_AS, &rl) == -1) {
PLOG_D("Couldn't enforce the RLIMIT_AS resource limit, ignoring");
}
}
if (hfuzz->nullifyStdio) {
util_nullifyStdio();
}
if (hfuzz->fuzzStdin) {
/*
* Uglyyyyyy ;)
*/
if (!util_redirectStdin(fileName)) {
return false;
}
}
if (hfuzz->clearEnv) {
environ = NULL;
}
if (sancov_prepareExecve(hfuzz) == false) {
LOG_E("sancov_prepareExecve() failed");
return false;
}
for (size_t i = 0; i < ARRAYSIZE(hfuzz->envs) && hfuzz->envs[i]; i++) {
putenv(hfuzz->envs[i]);
}
char fuzzNo[128];
snprintf(fuzzNo, sizeof(fuzzNo), "%" PRId32, fuzzer->fuzzNo);
setenv(_HF_THREAD_NO_ENV, fuzzNo, 1);
setsid();
if (hfuzz->bbFd != -1) {
if (dup2(hfuzz->bbFd, _HF_BITMAP_FD) == -1) {
PLOG_F("dup2('%d', %d)", hfuzz->bbFd, _HF_BITMAP_FD);
}
close(hfuzz->bbFd);
}
return true;
}
bool subproc_New(honggfuzz_t * hfuzz, fuzzer_t * fuzzer)
{
fuzzer->pid = fuzzer->persistentPid;
if (fuzzer->pid != 0) {
return true;
}
int sv[2];
if (hfuzz->persistent) {
if (fuzzer->persistentSock != -1) {
close(fuzzer->persistentSock);
}
int sock_type = SOCK_STREAM;
#if defined(SOCK_CLOEXEC)
sock_type |= SOCK_CLOEXEC;
#endif
if (socketpair(AF_UNIX, sock_type, 0, sv) == -1) {
PLOG_W("socketpair(AF_UNIX, SOCK_STREAM, 0, sv)");
return false;
}
fuzzer->persistentSock = sv[0];
}
fuzzer->pid = arch_fork(hfuzz, fuzzer);
if (fuzzer->pid == -1) {
PLOG_F("Couldn't fork");
}
// Child
if (!fuzzer->pid) {
if (hfuzz->persistent) {
if (dup2(sv[1], _HF_PERSISTENT_FD) == -1) {
PLOG_F("dup2('%d', '%d')", sv[1], _HF_PERSISTENT_FD);
}
close(sv[0]);
close(sv[1]);
}
if (!subproc_PrepareExecv(hfuzz, fuzzer, fuzzer->fileName)) {
LOG_E("subproc_PrepareExecv() failed");
exit(EXIT_FAILURE);
}
if (!arch_launchChild(hfuzz, fuzzer->fileName)) {
LOG_E("Error launching child process");
exit(EXIT_FAILURE);
}
abort();
}
// Parent
LOG_D("Launched new process, pid: %d, (concurrency: %zd)", fuzzer->pid, hfuzz->threadsMax);
if (hfuzz->persistent) {
close(sv[1]);
LOG_I("Persistent mode: Launched new persistent PID: %d", (int)fuzzer->pid);
fuzzer->persistentPid = fuzzer->pid;
}
return true;
}
bool subproc_persistentModeRoundDone(honggfuzz_t * hfuzz, fuzzer_t * fuzzer)
{
if (hfuzz->persistent == false) {
return false;
}
char z;
if (recv(fuzzer->persistentSock, &z, sizeof(z), MSG_DONTWAIT) == sizeof(z)) {
LOG_D("Persistent mode round finished");
return true;
}
return false;
}
static bool subproc_persistentSendFile(fuzzer_t * fuzzer)
{
uint32_t len = (uint64_t) fuzzer->dynamicFileSz;
if (files_writeToFd(fuzzer->persistentSock, (uint8_t *) & len, sizeof(len)) == false) {
return false;
}
if (files_writeToFd(fuzzer->persistentSock, fuzzer->dynamicFile, fuzzer->dynamicFileSz) ==
false) {
return false;
}
return true;
}
void subproc_Run(honggfuzz_t * hfuzz, fuzzer_t * fuzzer)
{
arch_prepareChild(hfuzz, fuzzer);
if (hfuzz->persistent == true && subproc_persistentSendFile(fuzzer) == false) {
LOG_W("Could not send file contents to the persistent process");
}
arch_reapChild(hfuzz, fuzzer);
}
uint8_t subproc_System(const char *const argv[])
{
pid_t pid = fork();
if (pid == -1) {
PLOG_E("Couldn't fork");
return 255;
}
if (!pid) {
execv(argv[0], (char *const *)&argv[0]);
PLOG_F("Couldn't execute '%s'", argv[0]);
return 255;
}
int status;
int flags = 0;
#if defined(__WNOTHREAD)
flags |= __WNOTHREAD;
#endif /* defined(__WNOTHREAD) */
while (wait4(pid, &status, flags, NULL) != pid) ;
if (WIFSIGNALED(status)) {
LOG_E("Command '%s' terminated with signal: %d", argv[0], WTERMSIG(status));
return (100 + WTERMSIG(status));
}
if (!WIFEXITED(status)) {
LOG_F("Command '%s' terminated abnormally, status: %d", argv[0], status);
return 100;
}
LOG_D("Command '%s' exited with: %d", argv[0], WEXITSTATUS(status));
if (WEXITSTATUS(status)) {
LOG_W("Command '%s' exited with code: %d", argv[0], WEXITSTATUS(status));
return 1U;
}
return 0U;
}
void subproc_checkTimeLimit(honggfuzz_t * hfuzz, fuzzer_t * fuzzer)
{
if (hfuzz->tmOut == 0) {
return;
}
int64_t curMillis = util_timeNowMillis();
int64_t diffMillis = curMillis - fuzzer->timeStartedMillis;
if (diffMillis > (hfuzz->tmOut * 1000)) {
LOG_W("PID %d took too much time (limit %ld s). Sending SIGKILL",
fuzzer->pid, hfuzz->tmOut);
kill(fuzzer->pid, SIGKILL);
ATOMIC_POST_INC(hfuzz->timeoutedCnt);
}
}