#ifndef __NR_mmap
#define __NR_mmap 9
#endif
#ifndef __NR_socket
#define __NR_socket 41
#endif
#ifndef __NR_bind
#define __NR_bind 49
#endif
#ifndef __NR_setsockopt
#define __NR_setsockopt 54
#endif
#ifndef __NR_dup2
#define __NR_dup2 33
#endif
#ifndef __NR_sendto
#define __NR_sendto 44
#endif
#ifndef __NR_sendmsg
#define __NR_sendmsg 46
#endif

#define __STDC_VERSION__ 201112L

#define _GNU_SOURCE 

#include <sys/ioctl.h>
#include <sys/mman.h>
#include <sys/mount.h>
#include <sys/prctl.h>
#include <sys/resource.h>
#include <sys/socket.h>
#include <sys/stat.h>
#include <sys/syscall.h>
#include <sys/time.h>
#include <sys/types.h>
#include <sys/wait.h>

#include <linux/capability.h>
#include <linux/if.h>
#include <linux/if_tun.h>
#include <linux/kvm.h>
#include <linux/sched.h>
#include <net/if_arp.h>

#include <assert.h>
#include <dirent.h>
#include <errno.h>
#include <fcntl.h>
#include <grp.h>
#include <pthread.h>
#include <setjmp.h>
#include <signal.h>
#include <stdarg.h>
#include <stdbool.h>
#include <stddef.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>

const int kFailStatus = 67;
const int kErrorStatus = 68;
const int kRetryStatus = 69;

__attribute__((noreturn)) void doexit(int status)
{
	volatile unsigned i;
	syscall(__NR_exit_group, status);
	for (i = 0;; i++) {
	}
}

__attribute__((noreturn)) void fail(const char* msg, ...)
{
	int e = errno;
	fflush(stdout);
	va_list args;
	va_start(args, msg);
	vfprintf(stderr, msg, args);
	va_end(args);
	fprintf(stderr, " (errno %d)\n", e);
	doexit(e == ENOMEM ? kRetryStatus : kFailStatus);
}

__attribute__((noreturn)) void exitf(const char* msg, ...)
{
	int e = errno;
	fflush(stdout);
	va_list args;
	va_start(args, msg);
	vfprintf(stderr, msg, args);
	va_end(args);
	fprintf(stderr, " (errno %d)\n", e);
	doexit(kRetryStatus);
}

static int flag_debug;

void debug(const char* msg, ...)
{
	if (!flag_debug)
		return;
	va_list args;
	va_start(args, msg);
	vfprintf(stdout, msg, args);
	va_end(args);
	fflush(stdout);
}

__thread int skip_segv;
__thread jmp_buf segv_env;

static void segv_handler(int sig, siginfo_t* info, void* uctx)
{
	uintptr_t addr = (uintptr_t)info->si_addr;
	const uintptr_t prog_start = 1 << 20;
	const uintptr_t prog_end = 100 << 20;
	if (__atomic_load_n(&skip_segv, __ATOMIC_RELAXED) && (addr < prog_start || addr > prog_end)) {
		debug("SIGSEGV on %p, skipping\n", addr);
		_longjmp(segv_env, 1);
	}
	debug("SIGSEGV on %p, exiting\n", addr);
	doexit(sig);
	for (;;) {
	}
}

static void install_segv_handler()
{
	struct sigaction sa;
	memset(&sa, 0, sizeof(sa));
	sa.sa_sigaction = segv_handler;
	sa.sa_flags = SA_NODEFER | SA_SIGINFO;
	sigaction(SIGSEGV, &sa, NULL);
	sigaction(SIGBUS, &sa, NULL);
}

#define NONFAILING(...) { __atomic_fetch_add(&skip_segv, 1, __ATOMIC_SEQ_CST); if (_setjmp(segv_env) == 0) { __VA_ARGS__; } __atomic_fetch_sub(&skip_segv, 1, __ATOMIC_SEQ_CST); }

#define BITMASK_LEN(type,bf_len) (type)((1ull << (bf_len)) - 1)

#define BITMASK_LEN_OFF(type,bf_off,bf_len) (type)(BITMASK_LEN(type, (bf_len)) << (bf_off))

#define STORE_BY_BITMASK(type,addr,val,bf_off,bf_len) if ((bf_off) == 0 && (bf_len) == 0) { *(type*)(addr) = (type)(val); } else { type new_val = *(type*)(addr); new_val &= ~BITMASK_LEN_OFF(type, (bf_off), (bf_len)); new_val |= ((type)(val)&BITMASK_LEN(type, (bf_len))) << (bf_off); *(type*)(addr) = new_val; }

static uintptr_t execute_syscall(int nr, uintptr_t a0, uintptr_t a1, uintptr_t a2, uintptr_t a3, uintptr_t a4, uintptr_t a5, uintptr_t a6, uintptr_t a7, uintptr_t a8)
{
	switch (nr) {
	default:
		return syscall(nr, a0, a1, a2, a3, a4, a5);
	}
}

static void setup_main_process()
{
	struct sigaction sa;
	memset(&sa, 0, sizeof(sa));
	sa.sa_handler = SIG_IGN;
	syscall(SYS_rt_sigaction, 0x20, &sa, NULL, 8);
	syscall(SYS_rt_sigaction, 0x21, &sa, NULL, 8);
	install_segv_handler();

	char tmpdir_template[] = "./syzkaller.XXXXXX";
	char* tmpdir = mkdtemp(tmpdir_template);
	if (!tmpdir)
		fail("failed to mkdtemp");
	if (chmod(tmpdir, 0777))
		fail("failed to chmod");
	if (chdir(tmpdir))
		fail("failed to chdir");
}

static void loop();

static void sandbox_common()
{
	prctl(PR_SET_PDEATHSIG, SIGKILL, 0, 0, 0);
	setpgrp();
	setsid();

	struct rlimit rlim;
	rlim.rlim_cur = rlim.rlim_max = 128 << 20;
	setrlimit(RLIMIT_AS, &rlim);
	rlim.rlim_cur = rlim.rlim_max = 1 << 20;
	setrlimit(RLIMIT_FSIZE, &rlim);
	rlim.rlim_cur = rlim.rlim_max = 1 << 20;
	setrlimit(RLIMIT_STACK, &rlim);
	rlim.rlim_cur = rlim.rlim_max = 0;
	setrlimit(RLIMIT_CORE, &rlim);

	unshare(CLONE_NEWNS);
	unshare(CLONE_NEWIPC);
	unshare(CLONE_IO);
}

static int do_sandbox_setuid(int executor_pid, bool enable_tun)
{
	int pid = fork();
	if (pid)
		return pid;

	sandbox_common();

	const int nobody = 65534;
	if (setgroups(0, NULL))
		fail("failed to setgroups");
	if (syscall(SYS_setresgid, nobody, nobody, nobody))
		fail("failed to setresgid");
	if (syscall(SYS_setresuid, nobody, nobody, nobody))
		fail("failed to setresuid");

	loop();
	doexit(1);
}

static void remove_dir(const char* dir)
{
	DIR* dp;
	struct dirent* ep;
	int iter = 0;
retry:
	dp = opendir(dir);
	if (dp == NULL) {
		if (errno == EMFILE) {
			exitf("opendir(%s) failed due to NOFILE, exiting");
		}
		exitf("opendir(%s) failed", dir);
	}
	while ((ep = readdir(dp))) {
		if (strcmp(ep->d_name, ".") == 0 || strcmp(ep->d_name, "..") == 0)
			continue;
		char filename[FILENAME_MAX];
		snprintf(filename, sizeof(filename), "%s/%s", dir, ep->d_name);
		struct stat st;
		if (lstat(filename, &st))
			exitf("lstat(%s) failed", filename);
		if (S_ISDIR(st.st_mode)) {
			remove_dir(filename);
			continue;
		}
		int i;
		for (i = 0;; i++) {
			debug("unlink(%s)\n", filename);
			if (unlink(filename) == 0)
				break;
			if (errno == EROFS) {
				debug("ignoring EROFS\n");
				break;
			}
			if (errno != EBUSY || i > 100)
				exitf("unlink(%s) failed", filename);
			debug("umount(%s)\n", filename);
			if (umount2(filename, MNT_DETACH))
				exitf("umount(%s) failed", filename);
		}
	}
	closedir(dp);
	int i;
	for (i = 0;; i++) {
		debug("rmdir(%s)\n", dir);
		if (rmdir(dir) == 0)
			break;
		if (i < 100) {
			if (errno == EROFS) {
				debug("ignoring EROFS\n");
				break;
			}
			if (errno == EBUSY) {
				debug("umount(%s)\n", dir);
				if (umount2(dir, MNT_DETACH))
					exitf("umount(%s) failed", dir);
				continue;
			}
			if (errno == ENOTEMPTY) {
				if (iter < 100) {
					iter++;
					goto retry;
				}
			}
		}
		exitf("rmdir(%s) failed", dir);
	}
}

static uint64_t current_time_ms()
{
	struct timespec ts;

	if (clock_gettime(CLOCK_MONOTONIC, &ts))
		fail("clock_gettime failed");
	return (uint64_t)ts.tv_sec * 1000 + (uint64_t)ts.tv_nsec / 1000000;
}

static void test();

void loop()
{
	int iter;
	for (iter = 0;; iter++) {
		char cwdbuf[256];
		sprintf(cwdbuf, "./%d", iter);
		if (mkdir(cwdbuf, 0777))
			fail("failed to mkdir");
		int pid = fork();
		if (pid < 0)
			fail("clone failed");
		if (pid == 0) {
			prctl(PR_SET_PDEATHSIG, SIGKILL, 0, 0, 0);
			setpgrp();
			if (chdir(cwdbuf))
				fail("failed to chdir");
			test();
			doexit(0);
		}
		int status = 0;
		uint64_t start = current_time_ms();
		for (;;) {
			int res = waitpid(-1, &status, __WALL | WNOHANG);
			if (res == pid)
				break;
			usleep(1000);
			if (current_time_ms() - start > 5 * 1000) {
				kill(-pid, SIGKILL);
				kill(pid, SIGKILL);
				while (waitpid(-1, &status, __WALL) != pid) {
				}
				break;
			}
		}
		remove_dir(cwdbuf);
	}
}

long r[103];
void *thr(void *arg)
{
	switch ((long)arg) {
	case 0:
		r[0] = execute_syscall(__NR_mmap, 0x20000000ul, 0x26000ul, 0x3ul, 0x32ul, 0xfffffffffffffffful, 0x0ul, 0, 0, 0);
		break;
	case 1:
		r[1] = execute_syscall(__NR_socket, 0x2ul, 0x1ul, 0x0ul, 0, 0, 0, 0, 0, 0);
		break;
	case 2:
		NONFAILING(*(uint16_t*)0x2000cff0 = (uint16_t)0x2);
		NONFAILING(*(uint16_t*)0x2000cff2 = (uint16_t)0x234e);
		NONFAILING(*(uint32_t*)0x2000cff4 = (uint32_t)0xffffffff);
		NONFAILING(*(uint8_t*)0x2000cff8 = (uint8_t)0x0);
		NONFAILING(*(uint8_t*)0x2000cff9 = (uint8_t)0x0);
		NONFAILING(*(uint8_t*)0x2000cffa = (uint8_t)0x0);
		NONFAILING(*(uint8_t*)0x2000cffb = (uint8_t)0x0);
		NONFAILING(*(uint8_t*)0x2000cffc = (uint8_t)0x0);
		NONFAILING(*(uint8_t*)0x2000cffd = (uint8_t)0x0);
		NONFAILING(*(uint8_t*)0x2000cffe = (uint8_t)0x0);
		NONFAILING(*(uint8_t*)0x2000cfff = (uint8_t)0x0);
		r[13] = execute_syscall(__NR_bind, r[1], 0x2000cff0ul, 0x10ul, 0, 0, 0, 0, 0, 0);
		break;
	case 3:
		NONFAILING(*(uint32_t*)0x20012000 = (uint32_t)0x0);
		r[15] = execute_syscall(__NR_setsockopt, r[1], 0x1ul, 0x8ul, 0x20012000ul, 0x4ul, 0, 0, 0, 0);
		break;
	case 4:
		r[16] = execute_syscall(__NR_dup2, r[1], r[1], 0, 0, 0, 0, 0, 0, 0);
		break;
	case 5:
		NONFAILING(*(uint16_t*)0x20012ff0 = (uint16_t)0x2);
		NONFAILING(*(uint16_t*)0x20012ff2 = (uint16_t)0x234e);
		NONFAILING(*(uint32_t*)0x20012ff4 = (uint32_t)0x0);
		NONFAILING(*(uint8_t*)0x20012ff8 = (uint8_t)0x0);
		NONFAILING(*(uint8_t*)0x20012ff9 = (uint8_t)0x0);
		NONFAILING(*(uint8_t*)0x20012ffa = (uint8_t)0x0);
		NONFAILING(*(uint8_t*)0x20012ffb = (uint8_t)0x0);
		NONFAILING(*(uint8_t*)0x20012ffc = (uint8_t)0x0);
		NONFAILING(*(uint8_t*)0x20012ffd = (uint8_t)0x0);
		NONFAILING(*(uint8_t*)0x20012ffe = (uint8_t)0x0);
		NONFAILING(*(uint8_t*)0x20012fff = (uint8_t)0x0);
		r[28] = execute_syscall(__NR_sendto, r[1], 0x2000afdful, 0x0ul, 0x2000c011ul, 0x20012ff0ul, 0x10ul, 0, 0, 0);
		break;
	case 6:
		NONFAILING(*(uint32_t*)0x2001fffc = (uint32_t)0xc38);
		r[30] = execute_syscall(__NR_setsockopt, r[1], 0x1ul, 0x7ul, 0x2001fffcul, 0x4ul, 0, 0, 0, 0);
		break;
	case 7:
		NONFAILING(memcpy((void*)0x2001b000, 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f\xa3\xee\xa4\x36\x1d\x53\x68\x08\xad\x8d\x96\xf3\x0b\xa9\x06\x00\x00\x00\x00\x00\x00\x00\x42\xb4\x93\xe2\xe6\x4d\x70\xa3\xe3\x1c\x8c\xac\x31\x1f\x8d\x3c\xdd\x88\xcc\x7f\x1d\x3a\xc5\x36\xc2\xba\x29\xd5\xaf\x1b\xe6\x7c\xcb\x2f\x51\x76\xae\x7e\xeb\xd1\xbf\x27\x6e\x8d\xf7\x00\x62\x2f\x29\x9a\xcf\xca\xeb\x9d\x7b\x42\xad\x7a\xe4\x8f\x27\x0f\x90\x80\x07\xa5\x52\x35", 3840));
		r[32] = execute_syscall(__NR_sendto, r[1], 0x2001b000ul, 0xf00ul, 0x40000ul, 0x2001b000ul, 0x0ul, 0, 0, 0);
		break;
	case 8:
		NONFAILING(*(uint64_t*)0x2001c000 = (uint64_t)0x20023ff4);
		NONFAILING(*(uint32_t*)0x2001c008 = (uint32_t)0xc);
		NONFAILING(*(uint64_t*)0x2001c010 = (uint64_t)0x20024000);
		NONFAILING(*(uint64_t*)0x2001c018 = (uint64_t)0x0);
		NONFAILING(*(uint64_t*)0x2001c020 = (uint64_t)0x20022ed0);
		NONFAILING(*(uint64_t*)0x2001c028 = (uint64_t)0x9);
		NONFAILING(*(uint32_t*)0x2001c030 = (uint32_t)0x1);
		NONFAILING(*(uint16_t*)0x20023ff4 = (uint16_t)0x0);
		NONFAILING(*(uint16_t*)0x20023ff6 = (uint16_t)0x0);
		NONFAILING(*(uint32_t*)0x20023ff8 = (uint32_t)0x20);
		NONFAILING(*(uint32_t*)0x20023ffc = (uint32_t)0x6);
		NONFAILING(*(uint64_t*)0x20022ed0 = (uint64_t)0x20);
		NONFAILING(*(uint32_t*)0x20022ed8 = (uint32_t)0x1);
		NONFAILING(*(uint32_t*)0x20022edc = (uint32_t)0x2);
		NONFAILING(*(uint32_t*)0x20022ee0 = (uint32_t)0x0);
		NONFAILING(*(uint32_t*)0x20022ee4 = (uint32_t)0x0);
		NONFAILING(*(uint32_t*)0x20022ee8 = (uint32_t)0x0);
		NONFAILING(*(uint64_t*)0x20022ef0 = (uint64_t)0x28);
		NONFAILING(*(uint32_t*)0x20022ef8 = (uint32_t)0x1);
		NONFAILING(*(uint32_t*)0x20022efc = (uint32_t)0x1);
		NONFAILING(*(uint32_t*)0x20022f00 = r[16]);
		NONFAILING(*(uint32_t*)0x20022f04 = r[16]);
		NONFAILING(*(uint32_t*)0x20022f08 = r[16]);
		NONFAILING(*(uint32_t*)0x20022f0c = r[1]);
		NONFAILING(*(uint32_t*)0x20022f10 = r[1]);
		NONFAILING(*(uint64_t*)0x20022f18 = (uint64_t)0x30);
		NONFAILING(*(uint32_t*)0x20022f20 = (uint32_t)0x1);
		NONFAILING(*(uint32_t*)0x20022f24 = (uint32_t)0x1);
		NONFAILING(*(uint32_t*)0x20022f28 = r[16]);
		NONFAILING(*(uint32_t*)0x20022f2c = r[16]);
		NONFAILING(*(uint32_t*)0x20022f30 = r[1]);
		NONFAILING(*(uint32_t*)0x20022f34 = r[16]);
		NONFAILING(*(uint32_t*)0x20022f38 = r[1]);
		NONFAILING(*(uint32_t*)0x20022f3c = r[16]);
		NONFAILING(*(uint32_t*)0x20022f40 = r[16]);
		NONFAILING(*(uint64_t*)0x20022f48 = (uint64_t)0x20);
		NONFAILING(*(uint32_t*)0x20022f50 = (uint32_t)0x1);
		NONFAILING(*(uint32_t*)0x20022f54 = (uint32_t)0x2);
		NONFAILING(*(uint32_t*)0x20022f58 = (uint32_t)0x0);
		NONFAILING(*(uint32_t*)0x20022f5c = (uint32_t)0x0);
		NONFAILING(*(uint32_t*)0x20022f60 = (uint32_t)0x0);
		NONFAILING(*(uint64_t*)0x20022f68 = (uint64_t)0x20);
		NONFAILING(*(uint32_t*)0x20022f70 = (uint32_t)0x1);
		NONFAILING(*(uint32_t*)0x20022f74 = (uint32_t)0x2);
		NONFAILING(*(uint32_t*)0x20022f78 = (uint32_t)0x0);
		NONFAILING(*(uint32_t*)0x20022f7c = (uint32_t)0x0);
		NONFAILING(*(uint32_t*)0x20022f80 = (uint32_t)0x0);
		NONFAILING(*(uint64_t*)0x20022f88 = (uint64_t)0x18);
		NONFAILING(*(uint32_t*)0x20022f90 = (uint32_t)0x1);
		NONFAILING(*(uint32_t*)0x20022f94 = (uint32_t)0x1);
		NONFAILING(*(uint32_t*)0x20022f98 = r[1]);
		NONFAILING(*(uint64_t*)0x20022fa0 = (uint64_t)0x20);
		NONFAILING(*(uint32_t*)0x20022fa8 = (uint32_t)0x1);
		NONFAILING(*(uint32_t*)0x20022fac = (uint32_t)0x2);
		NONFAILING(*(uint32_t*)0x20022fb0 = (uint32_t)0x0);
		NONFAILING(*(uint32_t*)0x20022fb4 = (uint32_t)0x0);
		NONFAILING(*(uint32_t*)0x20022fb8 = (uint32_t)0x0);
		NONFAILING(*(uint64_t*)0x20022fc0 = (uint64_t)0x20);
		NONFAILING(*(uint32_t*)0x20022fc8 = (uint32_t)0x1);
		NONFAILING(*(uint32_t*)0x20022fcc = (uint32_t)0x2);
		NONFAILING(*(uint32_t*)0x20022fd0 = (uint32_t)0x0);
		NONFAILING(*(uint32_t*)0x20022fd4 = (uint32_t)0x0);
		NONFAILING(*(uint32_t*)0x20022fd8 = (uint32_t)0x0);
		NONFAILING(*(uint64_t*)0x20022fe0 = (uint64_t)0x20);
		NONFAILING(*(uint32_t*)0x20022fe8 = (uint32_t)0x1);
		NONFAILING(*(uint32_t*)0x20022fec = (uint32_t)0x2);
		NONFAILING(*(uint32_t*)0x20022ff0 = (uint32_t)0x0);
		NONFAILING(*(uint32_t*)0x20022ff4 = (uint32_t)0x0);
		NONFAILING(*(uint32_t*)0x20022ff8 = (uint32_t)0x0);
		r[102] = execute_syscall(__NR_sendmsg, r[16], 0x2001c000ul, 0x20000000ul, 0, 0, 0, 0, 0, 0);
		break;
	}
	return 0;
}

void test()
{
	long i;
	pthread_t th[18];

	syscall(SYS_write, 1, "executing program\n", strlen("executing program\n"));
	memset(r, -1, sizeof(r));
	srand(getpid());
	for (i = 0; i < 9; i++) {
		pthread_create(&th[i], 0, thr, (void*)i);
		usleep(10000);
	}
	for (i = 0; i < 9; i++) {
		pthread_create(&th[9+i], 0, thr, (void*)i);
		if (rand()%2)
			usleep(rand()%10000);
	}
	usleep(100000);
}

int main()
{
	int i;	for (i = 0; i < 4; i++) {
		if (fork() == 0) {
			setup_main_process();
			int pid = do_sandbox_setuid(i, false);
			int status = 0;
			while (waitpid(pid, &status, __WALL) != pid) {}
			return 0;
		}
	}
	sleep(1000000);
	return 0;
}