// https://syzkaller.appspot.com/bug?id=311e3c9687f028b7c83a7f327936f38313dd2529
// autogenerated by syzkaller (http://github.com/google/syzkaller)

#define _GNU_SOURCE
#include <endian.h>
#include <errno.h>
#include <fcntl.h>
#include <linux/loop.h>
#include <stdio.h>
#include <sys/ioctl.h>
#include <sys/mount.h>
#include <sys/stat.h>
#include <sys/syscall.h>
#include <sys/types.h>
#include <unistd.h>

__attribute__((noreturn)) static void doexit(int status)
{
  volatile unsigned i;
  syscall(__NR_exit_group, status);
  for (i = 0;; i++) {
  }
}
#include <setjmp.h>
#include <signal.h>
#include <stdint.h>
#include <string.h>
#include <string.h>

static __thread int skip_segv;
static __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)) {
    _longjmp(segv_env, 1);
  }
  doexit(sig);
}

static void install_segv_handler()
{
  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);                       \
  }

extern unsigned long long procid;

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

#define IMAGE_MAX_SEGMENTS 4096
#define IMAGE_MAX_SIZE (32 << 20)

#define SYZ_memfd_create 319

static uintptr_t syz_mount_image(uintptr_t fs, uintptr_t dir, uintptr_t size,
                                 uintptr_t nsegs, uintptr_t segments,
                                 uintptr_t flags, uintptr_t opts)
{
  char loopname[64];
  int loopfd, err = 0, res = -1;
  uintptr_t 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;
  int memfd = syscall(SYZ_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++) {
    if (pwrite(memfd, segs[i].data, segs[i].size, segs[i].offset) < 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);
  NONFAILING(if (strcmp((char*)fs, "iso9660") == 0) flags |= MS_RDONLY);
  if (mount(loopname, (char*)dir, (char*)fs, flags, (char*)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;
}

uint64_t r[2] = {0xffffffffffffffff, 0xffffffffffffffff};
unsigned long long procid;
void loop()
{
  long res = 0;
  NONFAILING(memcpy((void*)0x20000080, "./file0", 8));
  syscall(__NR_mknod, 0x20000080, 0, 0);
  NONFAILING(memcpy((void*)0x20000000, "ext2", 5));
  NONFAILING(memcpy((void*)0x20000040, "./file0", 8));
  NONFAILING(*(uint8_t*)0x20002840 = 0);
  syz_mount_image(0x20000000, 0x20000040, 0, 0, 0x200027c0, 0x1008, 0x20002840);
  NONFAILING(memcpy((void*)0x20712ff8, "./file0", 8));
  NONFAILING(memcpy((void*)0x20faffe7, "security.capability", 20));
  NONFAILING(memcpy((void*)0x202b2fec, "\x00\x00\x00\x02\x01\x00\x00\x00\x00"
                                       "\x00\x00\x01\x04\x00\x00\x00\x00\x00"
                                       "\x00\x00",
                    20));
  syscall(__NR_lsetxattr, 0x20712ff8, 0x20faffe7, 0x202b2fec, 0x14, 0);
  NONFAILING(memcpy((void*)0x20000000, "./bus", 6));
  syscall(__NR_open, 0x20000000, 0x100000141842, 0);
  NONFAILING(memcpy((void*)0x20000440, "ntfs", 5));
  NONFAILING(memcpy((void*)0x20000480, "./bus", 6));
  syz_mount_image(0x20000440, 0x20000480, 0, 0, 0x200006c0, 0x1000, 0x20000740);
  NONFAILING(memcpy((void*)0x20002000, "./bus", 6));
  res = syscall(__NR_open, 0x20002000, 0x141042, 0);
  if (res != -1)
    r[0] = res;
  NONFAILING(memcpy((void*)0x20000080, "hfs", 4));
  NONFAILING(memcpy((void*)0x20000100, "./bus", 6));
  NONFAILING(*(uint64_t*)0x20000340 = 0x20000140);
  NONFAILING(*(uint64_t*)0x20000348 = 0);
  NONFAILING(*(uint64_t*)0x20000350 = 0x55c3);
  syz_mount_image(0x20000080, 0x20000100, 0, 1, 0x20000340, 0, 0x20000780);
  res = syscall(__NR_dup, r[0]);
  if (res != -1)
    r[1] = res;
  NONFAILING(*(uint8_t*)0x200004c0 = 0x7f);
  NONFAILING(*(uint8_t*)0x200004c1 = 0x45);
  NONFAILING(*(uint8_t*)0x200004c2 = 0x4c);
  NONFAILING(*(uint8_t*)0x200004c3 = 0x46);
  NONFAILING(*(uint8_t*)0x200004c4 = 0);
  NONFAILING(*(uint8_t*)0x200004c5 = 0);
  NONFAILING(*(uint8_t*)0x200004c6 = 0);
  NONFAILING(*(uint8_t*)0x200004c7 = 0);
  NONFAILING(*(uint64_t*)0x200004c8 = 0);
  NONFAILING(*(uint16_t*)0x200004d0 = 0);
  NONFAILING(*(uint16_t*)0x200004d2 = 0);
  NONFAILING(*(uint32_t*)0x200004d4 = 0);
  NONFAILING(*(uint32_t*)0x200004d8 = 0);
  NONFAILING(*(uint32_t*)0x200004dc = 0x38);
  NONFAILING(*(uint32_t*)0x200004e0 = 0);
  NONFAILING(*(uint32_t*)0x200004e4 = 0);
  NONFAILING(*(uint16_t*)0x200004e8 = 0);
  NONFAILING(*(uint16_t*)0x200004ea = 0x20);
  NONFAILING(*(uint16_t*)0x200004ec = 0);
  NONFAILING(*(uint16_t*)0x200004ee = 0);
  NONFAILING(*(uint16_t*)0x200004f0 = 0);
  NONFAILING(*(uint16_t*)0x200004f2 = 0);
  NONFAILING(*(uint32_t*)0x200004f8 = 0);
  NONFAILING(*(uint32_t*)0x200004fc = 0);
  NONFAILING(*(uint32_t*)0x20000500 = 0);
  NONFAILING(*(uint32_t*)0x20000504 = 0);
  NONFAILING(*(uint32_t*)0x20000508 = 0);
  NONFAILING(*(uint32_t*)0x2000050c = 0);
  NONFAILING(*(uint32_t*)0x20000510 = 0);
  NONFAILING(*(uint32_t*)0x20000514 = 0);
  NONFAILING(*(uint64_t*)0x20000518 = 0);
  NONFAILING(*(uint64_t*)0x20000520 = 0);
  NONFAILING(*(uint64_t*)0x20000528 = 0);
  NONFAILING(*(uint64_t*)0x20000530 = 0);
  NONFAILING(*(uint64_t*)0x20000538 = 0);
  NONFAILING(*(uint64_t*)0x20000540 = 0);
  NONFAILING(*(uint64_t*)0x20000548 = 0);
  NONFAILING(*(uint64_t*)0x20000550 = 0);
  NONFAILING(*(uint64_t*)0x20000558 = 0);
  NONFAILING(*(uint64_t*)0x20000560 = 0);
  NONFAILING(*(uint64_t*)0x20000568 = 0);
  NONFAILING(*(uint64_t*)0x20000570 = 0);
  NONFAILING(*(uint64_t*)0x20000578 = 0);
  NONFAILING(*(uint64_t*)0x20000580 = 0);
  NONFAILING(*(uint64_t*)0x20000588 = 0);
  NONFAILING(*(uint64_t*)0x20000590 = 0);
  NONFAILING(*(uint64_t*)0x20000598 = 0);
  NONFAILING(*(uint64_t*)0x200005a0 = 0);
  NONFAILING(*(uint64_t*)0x200005a8 = 0);
  NONFAILING(*(uint64_t*)0x200005b0 = 0);
  NONFAILING(*(uint64_t*)0x200005b8 = 0);
  NONFAILING(*(uint64_t*)0x200005c0 = 0);
  NONFAILING(*(uint64_t*)0x200005c8 = 0);
  NONFAILING(*(uint64_t*)0x200005d0 = 0);
  NONFAILING(*(uint64_t*)0x200005d8 = 0);
  NONFAILING(*(uint64_t*)0x200005e0 = 0);
  NONFAILING(*(uint64_t*)0x200005e8 = 0);
  NONFAILING(*(uint64_t*)0x200005f0 = 0);
  NONFAILING(*(uint64_t*)0x200005f8 = 0);
  NONFAILING(*(uint64_t*)0x20000600 = 0);
  NONFAILING(*(uint64_t*)0x20000608 = 0);
  NONFAILING(*(uint64_t*)0x20000610 = 0);
  syscall(__NR_write, r[1], 0x200004c0, 0x158);
}

int main()
{
  syscall(__NR_mmap, 0x20000000, 0x1000000, 3, 0x32, -1, 0);
  install_segv_handler();
  loop();
  return 0;
}