// https://syzkaller.appspot.com/bug?id=d6476e0883629cee499ab7e2d21a785fb8287898
// autogenerated by syzkaller (https://github.com/google/syzkaller)

#define _GNU_SOURCE

#include <endian.h>
#include <errno.h>
#include <fcntl.h>
#include <setjmp.h>
#include <signal.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/ioctl.h>
#include <sys/mount.h>
#include <sys/stat.h>
#include <sys/syscall.h>
#include <sys/types.h>
#include <unistd.h>

#include <linux/loop.h>

unsigned long long procid;

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))))

struct fs_image_segment {
  void* data;
  uintptr_t size;
  uintptr_t offset;
};

#define IMAGE_MAX_SEGMENTS 4096
#define IMAGE_MAX_SIZE (129 << 20)

#define sys_memfd_create 319

static unsigned long fs_image_segment_check(unsigned long size,
                                            unsigned long nsegs, long segments)
{
  unsigned long i;
  struct fs_image_segment* segs = (struct fs_image_segment*)segments;
  if (nsegs > IMAGE_MAX_SEGMENTS)
    nsegs = IMAGE_MAX_SEGMENTS;
  for (i = 0; i < nsegs; i++) {
    if (segs[i].size > IMAGE_MAX_SIZE)
      segs[i].size = IMAGE_MAX_SIZE;
    segs[i].offset %= IMAGE_MAX_SIZE;
    if (segs[i].offset > IMAGE_MAX_SIZE - segs[i].size)
      segs[i].offset = IMAGE_MAX_SIZE - segs[i].size;
    if (size < segs[i].offset + segs[i].offset)
      size = segs[i].offset + segs[i].offset;
  }
  if (size > IMAGE_MAX_SIZE)
    size = IMAGE_MAX_SIZE;
  return size;
}

static long syz_mount_image(volatile long fsarg, volatile long dir,
                            volatile unsigned long size,
                            volatile unsigned long nsegs,
                            volatile long segments, volatile long flags,
                            volatile long optsarg)
{
  char loopname[64], fs[32], opts[256];
  int loopfd, err = 0, res = -1;
  unsigned long i;
  NONFAILING(size = fs_image_segment_check(size, nsegs, segments));
  int memfd = syscall(sys_memfd_create, "syz_mount_image", 0);
  if (memfd == -1) {
    err = errno;
    goto error;
  }
  if (ftruncate(memfd, size)) {
    err = errno;
    goto error_close_memfd;
  }
  for (i = 0; i < nsegs; i++) {
    struct fs_image_segment* segs = (struct fs_image_segment*)segments;
    int res1 = 0;
    NONFAILING(res1 =
                   pwrite(memfd, segs[i].data, segs[i].size, segs[i].offset));
    if (res1 < 0) {
    }
  }
  snprintf(loopname, sizeof(loopname), "/dev/loop%llu", procid);
  loopfd = open(loopname, O_RDWR);
  if (loopfd == -1) {
    err = errno;
    goto error_close_memfd;
  }
  if (ioctl(loopfd, LOOP_SET_FD, memfd)) {
    if (errno != EBUSY) {
      err = errno;
      goto error_close_loop;
    }
    ioctl(loopfd, LOOP_CLR_FD, 0);
    usleep(1000);
    if (ioctl(loopfd, LOOP_SET_FD, memfd)) {
      err = errno;
      goto error_close_loop;
    }
  }
  mkdir((char*)dir, 0777);
  memset(fs, 0, sizeof(fs));
  NONFAILING(strncpy(fs, (char*)fsarg, sizeof(fs) - 1));
  memset(opts, 0, sizeof(opts));
  NONFAILING(strncpy(opts, (char*)optsarg, sizeof(opts) - 32));
  if (strcmp(fs, "iso9660") == 0) {
    flags |= MS_RDONLY;
  } else if (strncmp(fs, "ext", 3) == 0) {
    if (strstr(opts, "errors=panic") || strstr(opts, "errors=remount-ro") == 0)
      strcat(opts, ",errors=continue");
  } else if (strcmp(fs, "xfs") == 0) {
    strcat(opts, ",nouuid");
  }
  if (mount(loopname, (char*)dir, fs, flags, opts)) {
    err = errno;
    goto error_clear_loop;
  }
  res = 0;
error_clear_loop:
  ioctl(loopfd, LOOP_CLR_FD, 0);
error_close_loop:
  close(loopfd);
error_close_memfd:
  close(memfd);
error:
  errno = err;
  return res;
}

#ifndef __NR_sched_setattr
#define __NR_sched_setattr 314
#endif

int main(void)
{
  syscall(__NR_mmap, 0x20000000ul, 0x1000000ul, 3ul, 0x32ul, -1, 0);
  install_segv_handler();
  NONFAILING(*(uint64_t*)0x20000280 = 9);
  NONFAILING(*(uint64_t*)0x20000288 = 0x8d);
  syscall(__NR_prlimit64, 0, 0xeul, 0x20000280ul, 0ul);
  NONFAILING(*(uint32_t*)0x20000080 = 0x38);
  NONFAILING(*(uint32_t*)0x20000084 = 2);
  NONFAILING(*(uint64_t*)0x20000088 = 1);
  NONFAILING(*(uint32_t*)0x20000090 = 0);
  NONFAILING(*(uint32_t*)0x20000094 = 3);
  NONFAILING(*(uint64_t*)0x20000098 = 0);
  NONFAILING(*(uint64_t*)0x200000a0 = 0);
  NONFAILING(*(uint64_t*)0x200000a8 = 0);
  NONFAILING(*(uint32_t*)0x200000b0 = 0);
  NONFAILING(*(uint32_t*)0x200000b4 = 0);
  syscall(__NR_sched_setattr, 0, 0x20000080ul, 0ul);
  syscall(__NR_socket, 0x10ul, 0ul, 0);
  NONFAILING(*(uint32_t*)0x2001d000 = 1);
  NONFAILING(*(uint32_t*)0x2001d004 = 0x70);
  NONFAILING(*(uint8_t*)0x2001d008 = 0);
  NONFAILING(*(uint8_t*)0x2001d009 = 0);
  NONFAILING(*(uint8_t*)0x2001d00a = 0);
  NONFAILING(*(uint8_t*)0x2001d00b = 0);
  NONFAILING(*(uint32_t*)0x2001d00c = 0);
  NONFAILING(*(uint64_t*)0x2001d010 = 0x41c0);
  NONFAILING(*(uint64_t*)0x2001d018 = 0);
  NONFAILING(*(uint64_t*)0x2001d020 = 0);
  NONFAILING(STORE_BY_BITMASK(uint64_t, , 0x2001d028, 0, 0, 1));
  NONFAILING(STORE_BY_BITMASK(uint64_t, , 0x2001d028, 0, 1, 1));
  NONFAILING(STORE_BY_BITMASK(uint64_t, , 0x2001d028, 0, 2, 1));
  NONFAILING(STORE_BY_BITMASK(uint64_t, , 0x2001d028, 0, 3, 1));
  NONFAILING(STORE_BY_BITMASK(uint64_t, , 0x2001d028, 0, 4, 1));
  NONFAILING(STORE_BY_BITMASK(uint64_t, , 0x2001d028, 0, 5, 1));
  NONFAILING(STORE_BY_BITMASK(uint64_t, , 0x2001d028, 0, 6, 1));
  NONFAILING(STORE_BY_BITMASK(uint64_t, , 0x2001d028, 0, 7, 1));
  NONFAILING(STORE_BY_BITMASK(uint64_t, , 0x2001d028, 0, 8, 1));
  NONFAILING(STORE_BY_BITMASK(uint64_t, , 0x2001d028, 0, 9, 1));
  NONFAILING(STORE_BY_BITMASK(uint64_t, , 0x2001d028, 0, 10, 1));
  NONFAILING(STORE_BY_BITMASK(uint64_t, , 0x2001d028, 0, 11, 1));
  NONFAILING(STORE_BY_BITMASK(uint64_t, , 0x2001d028, 0, 12, 1));
  NONFAILING(STORE_BY_BITMASK(uint64_t, , 0x2001d028, 0, 13, 1));
  NONFAILING(STORE_BY_BITMASK(uint64_t, , 0x2001d028, 0, 14, 1));
  NONFAILING(STORE_BY_BITMASK(uint64_t, , 0x2001d028, 0, 15, 2));
  NONFAILING(STORE_BY_BITMASK(uint64_t, , 0x2001d028, 0, 17, 1));
  NONFAILING(STORE_BY_BITMASK(uint64_t, , 0x2001d028, 0, 18, 1));
  NONFAILING(STORE_BY_BITMASK(uint64_t, , 0x2001d028, 0, 19, 1));
  NONFAILING(STORE_BY_BITMASK(uint64_t, , 0x2001d028, 0, 20, 1));
  NONFAILING(STORE_BY_BITMASK(uint64_t, , 0x2001d028, 0, 21, 1));
  NONFAILING(STORE_BY_BITMASK(uint64_t, , 0x2001d028, 0, 22, 1));
  NONFAILING(STORE_BY_BITMASK(uint64_t, , 0x2001d028, 0, 23, 1));
  NONFAILING(STORE_BY_BITMASK(uint64_t, , 0x2001d028, 0, 24, 1));
  NONFAILING(STORE_BY_BITMASK(uint64_t, , 0x2001d028, 0, 25, 1));
  NONFAILING(STORE_BY_BITMASK(uint64_t, , 0x2001d028, 0, 26, 1));
  NONFAILING(STORE_BY_BITMASK(uint64_t, , 0x2001d028, 0, 27, 1));
  NONFAILING(STORE_BY_BITMASK(uint64_t, , 0x2001d028, 0, 28, 1));
  NONFAILING(STORE_BY_BITMASK(uint64_t, , 0x2001d028, 0, 29, 35));
  NONFAILING(*(uint32_t*)0x2001d030 = 0);
  NONFAILING(*(uint32_t*)0x2001d034 = 0);
  NONFAILING(*(uint64_t*)0x2001d038 = 0);
  NONFAILING(*(uint64_t*)0x2001d040 = 0);
  NONFAILING(*(uint64_t*)0x2001d048 = 0);
  NONFAILING(*(uint64_t*)0x2001d050 = 0);
  NONFAILING(*(uint32_t*)0x2001d058 = 0);
  NONFAILING(*(uint32_t*)0x2001d05c = 0);
  NONFAILING(*(uint64_t*)0x2001d060 = 0);
  NONFAILING(*(uint32_t*)0x2001d068 = 0);
  NONFAILING(*(uint16_t*)0x2001d06c = 0);
  NONFAILING(*(uint16_t*)0x2001d06e = 0);
  syscall(__NR_perf_event_open, 0x2001d000ul, 0, -1ul, -1, 0ul);
  NONFAILING(memcpy((void*)0x20000240, "vfat\000", 5));
  NONFAILING(memcpy((void*)0x20000280, "./file0\000", 8));
  syz_mount_image(0x20000240, 0x20000280, 0, 0xaaaaaaaaaaaab9c, 0x20000180, 0,
                  0);
  return 0;
}