// https://syzkaller.appspot.com/bug?id=3febc54950dcb8dc02d9b9fc24e4f0dfbda8e77f
// autogenerated by syzkaller (https://github.com/google/syzkaller)

#define _GNU_SOURCE

#include <endian.h>
#include <errno.h>
#include <fcntl.h>
#include <sched.h>
#include <setjmp.h>
#include <signal.h>
#include <stdarg.h>
#include <stdbool.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/mount.h>
#include <sys/prctl.h>
#include <sys/resource.h>
#include <sys/stat.h>
#include <sys/syscall.h>
#include <sys/time.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <unistd.h>

static __thread int skip_segv;
static __thread jmp_buf segv_env;

static void segv_handler(int sig, siginfo_t* info, void* ctx)
{
  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)) {
    _longjmp(segv_env, 1);
  }
  exit(sig);
}

static void install_segv_handler(void)
{
  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);
  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(bf_off, bf_len) (((1ull << (bf_len)) - 1) << (bf_off))
#define STORE_BY_BITMASK(type, htobe, addr, val, bf_off, bf_len)               \
  *(type*)(addr) =                                                             \
      htobe((htobe(*(type*)(addr)) & ~BITMASK((bf_off), (bf_len))) |           \
            (((type)(val) << (bf_off)) & BITMASK((bf_off), (bf_len))))

static bool write_file(const char* file, const char* what, ...)
{
  char buf[1024];
  va_list args;
  va_start(args, what);
  vsnprintf(buf, sizeof(buf), what, args);
  va_end(args);
  buf[sizeof(buf) - 1] = 0;
  int len = strlen(buf);
  int fd = open(file, O_WRONLY | O_CLOEXEC);
  if (fd == -1)
    return false;
  if (write(fd, buf, len) != len) {
    int err = errno;
    close(fd);
    errno = err;
    return false;
  }
  close(fd);
  return true;
}

static void setup_common()
{
  if (mount(0, "/sys/fs/fuse/connections", "fusectl", 0, 0)) {
  }
}

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 = (200 << 20);
  setrlimit(RLIMIT_AS, &rlim);
  rlim.rlim_cur = rlim.rlim_max = 32 << 20;
  setrlimit(RLIMIT_MEMLOCK, &rlim);
  rlim.rlim_cur = rlim.rlim_max = 136 << 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);
  rlim.rlim_cur = rlim.rlim_max = 256;
  setrlimit(RLIMIT_NOFILE, &rlim);
  if (unshare(CLONE_NEWNS)) {
  }
  if (unshare(CLONE_NEWIPC)) {
  }
  if (unshare(0x02000000)) {
  }
  if (unshare(CLONE_NEWUTS)) {
  }
  if (unshare(CLONE_SYSVSEM)) {
  }
  typedef struct {
    const char* name;
    const char* value;
  } sysctl_t;
  static const sysctl_t sysctls[] = {
      {"/proc/sys/kernel/shmmax", "16777216"},
      {"/proc/sys/kernel/shmall", "536870912"},
      {"/proc/sys/kernel/shmmni", "1024"},
      {"/proc/sys/kernel/msgmax", "8192"},
      {"/proc/sys/kernel/msgmni", "1024"},
      {"/proc/sys/kernel/msgmnb", "1024"},
      {"/proc/sys/kernel/sem", "1024 1048576 500 1024"},
  };
  unsigned i;
  for (i = 0; i < sizeof(sysctls) / sizeof(sysctls[0]); i++)
    write_file(sysctls[i].name, sysctls[i].value);
}

int wait_for_loop(int pid)
{
  if (pid < 0)
    exit(1);
  int status = 0;
  while (waitpid(-1, &status, __WALL) != pid) {
  }
  return WEXITSTATUS(status);
}

static int do_sandbox_none(void)
{
  if (unshare(CLONE_NEWPID)) {
  }
  int pid = fork();
  if (pid != 0)
    return wait_for_loop(pid);
  setup_common();
  sandbox_common();
  if (unshare(CLONE_NEWNET)) {
  }
  loop();
  exit(1);
}

#ifndef __NR_bpf
#define __NR_bpf 321
#endif

uint64_t r[1] = {0xffffffffffffffff};

void loop(void)
{
  intptr_t res = 0;
  NONFAILING(*(uint32_t*)0x20000180 = 0xc);
  NONFAILING(*(uint32_t*)0x20000184 = 4);
  NONFAILING(*(uint64_t*)0x20000188 = 0x20000000);
  NONFAILING(*(uint8_t*)0x20000000 = 0x18);
  NONFAILING(STORE_BY_BITMASK(uint8_t, , 0x20000001, 0, 0, 4));
  NONFAILING(STORE_BY_BITMASK(uint8_t, , 0x20000001, 0, 4, 4));
  NONFAILING(*(uint16_t*)0x20000002 = 0);
  NONFAILING(*(uint32_t*)0x20000004 = 0);
  NONFAILING(*(uint8_t*)0x20000008 = 0);
  NONFAILING(*(uint8_t*)0x20000009 = 0);
  NONFAILING(*(uint16_t*)0x2000000a = 0);
  NONFAILING(*(uint32_t*)0x2000000c = 0);
  NONFAILING(*(uint8_t*)0x20000010 = 0x61);
  NONFAILING(*(uint8_t*)0x20000011 = 0x11);
  NONFAILING(*(uint16_t*)0x20000012 = 0xa4);
  NONFAILING(*(uint32_t*)0x20000014 = 0);
  NONFAILING(*(uint8_t*)0x20000018 = 0x95);
  NONFAILING(*(uint8_t*)0x20000019 = 0);
  NONFAILING(*(uint16_t*)0x2000001a = 0);
  NONFAILING(*(uint32_t*)0x2000001c = 0);
  NONFAILING(*(uint64_t*)0x20000190 = 0x200000c0);
  NONFAILING(memcpy((void*)0x200000c0, "GPL\000", 4));
  NONFAILING(*(uint32_t*)0x20000198 = 4);
  NONFAILING(*(uint32_t*)0x2000019c = 0x1000);
  NONFAILING(*(uint64_t*)0x200001a0 = 0x20000200);
  NONFAILING(*(uint32_t*)0x200001a8 = 0);
  NONFAILING(*(uint32_t*)0x200001ac = 0);
  NONFAILING(*(uint8_t*)0x200001b0 = 0);
  NONFAILING(*(uint8_t*)0x200001b1 = 0);
  NONFAILING(*(uint8_t*)0x200001b2 = 0);
  NONFAILING(*(uint8_t*)0x200001b3 = 0);
  NONFAILING(*(uint8_t*)0x200001b4 = 0);
  NONFAILING(*(uint8_t*)0x200001b5 = 0);
  NONFAILING(*(uint8_t*)0x200001b6 = 0);
  NONFAILING(*(uint8_t*)0x200001b7 = 0);
  NONFAILING(*(uint8_t*)0x200001b8 = 0);
  NONFAILING(*(uint8_t*)0x200001b9 = 0);
  NONFAILING(*(uint8_t*)0x200001ba = 0);
  NONFAILING(*(uint8_t*)0x200001bb = 0);
  NONFAILING(*(uint8_t*)0x200001bc = 0);
  NONFAILING(*(uint8_t*)0x200001bd = 0);
  NONFAILING(*(uint8_t*)0x200001be = 0);
  NONFAILING(*(uint8_t*)0x200001bf = 0);
  NONFAILING(*(uint32_t*)0x200001c0 = 0);
  NONFAILING(*(uint32_t*)0x200001c4 = 0);
  NONFAILING(*(uint32_t*)0x200001c8 = -1);
  NONFAILING(*(uint32_t*)0x200001cc = 8);
  NONFAILING(*(uint64_t*)0x200001d0 = 0);
  NONFAILING(*(uint32_t*)0x200001d8 = 0);
  NONFAILING(*(uint32_t*)0x200001dc = 0x10);
  NONFAILING(*(uint64_t*)0x200001e0 = 0);
  NONFAILING(*(uint32_t*)0x200001e8 = 0);
  res = syscall(__NR_bpf, 5, 0x20000180, 0x70);
  if (res != -1)
    r[0] = res;
  NONFAILING(*(uint32_t*)0x20000040 = r[0]);
  NONFAILING(*(uint32_t*)0x20000044 = 0);
  NONFAILING(*(uint32_t*)0x20000048 = 0x8f);
  NONFAILING(*(uint32_t*)0x2000004c = 0);
  NONFAILING(*(uint64_t*)0x20000050 = 0x20001200);
  NONFAILING(memcpy(
      (void*)0x20001200,
      "\x75\x9a\x33\x2a\x4d\xc0\xc2\x49\x99\xc0\x99\x3f\x9b\x29\x01\xe9\x95\x6d"
      "\xad\x4a\x4c\xdd\x48\x0f\x7b\x27\x0d\x99\x56\x8b\x8d\x3b\x33\x0f\xad\x73"
      "\xb4\x47\xd6\x6a\x16\x48\x78\xac\xf9\x95\xe8\x0a\x93\x8e\x25\xda\x88\x3d"
      "\x8f\x66\xa9\x4f\x5b\x84\x29\x40\x50\xc1\x42\xe1\xd5\x93\x72\x40\xa2\x19"
      "\xa1\x30\xec\xde\xb0\xce\x16\xb5\x27\x1a\xe8\x0a\xf2\x0e\x15\x23\x8e\x42"
      "\x63\xea\xaf\x4a\x76\x63\x1c\x70\xf7\xc6\xea\x07\x3f\x8f\x97\x45\xeb\x61"
      "\xfb\x6d\x35\x3e\x23\x14\xf6\xca\x7e\x6f\x4e\x6a\xe1\xa1\x5b\x45\x64\xbb"
      "\x6a\x31\x13\xfe\xa3\xbf\xe6\xd3\x81\x89\xdf\xf3\x0c\xa5\x0c\xc1\x78",
      143));
  NONFAILING(*(uint64_t*)0x20000058 = 0);
  NONFAILING(*(uint32_t*)0x20000060 = 0);
  NONFAILING(*(uint32_t*)0x20000064 = 0);
  syscall(__NR_bpf, 0xa, 0x20000040, 0x28);
}
int main(void)
{
  syscall(__NR_mmap, 0x20000000, 0x1000000, 3, 0x32, -1, 0);
  install_segv_handler();
  do_sandbox_none();
  return 0;
}