// https://syzkaller.appspot.com/bug?id=b53d789b93ee44038efb6c5619d323e9ea8df76a
// autogenerated by syzkaller (https://github.com/google/syzkaller)

#define _GNU_SOURCE

#include <endian.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>

static __thread int clone_ongoing;
static __thread int skip_segv;
static __thread jmp_buf segv_env;

static void segv_handler(int sig, siginfo_t* info, void* ctx)
{
  if (__atomic_load_n(&clone_ongoing, __ATOMIC_RELAXED) != 0) {
    exit(sig);
  }
  uintptr_t addr = (uintptr_t)info->si_addr;
  const uintptr_t prog_start = 1 << 20;
  const uintptr_t prog_end = 100 << 20;
  int skip = __atomic_load_n(&skip_segv, __ATOMIC_RELAXED) != 0;
  int valid = addr < prog_start || addr > prog_end;
  if (skip && valid) {
    _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(...)                                                        \
  ({                                                                           \
    int ok = 1;                                                                \
    __atomic_fetch_add(&skip_segv, 1, __ATOMIC_SEQ_CST);                       \
    if (_setjmp(segv_env) == 0) {                                              \
      __VA_ARGS__;                                                             \
    } else                                                                     \
      ok = 0;                                                                  \
    __atomic_fetch_sub(&skip_segv, 1, __ATOMIC_SEQ_CST);                       \
    ok;                                                                        \
  })

const int kInitNetNsFd = 201;

static long syz_open_pts(volatile long a0, volatile long a1)
{
  int ptyno = 0;
  if (ioctl(a0, TIOCGPTN, &ptyno))
    return -1;
  char buf[128];
  sprintf(buf, "/dev/pts/%d", ptyno);
  return open(buf, a1, 0);
}

static long syz_init_net_socket(volatile long domain, volatile long type,
                                volatile long proto)
{
  return syscall(__NR_socket, domain, type, proto);
}

uint64_t r[3] = {0xffffffffffffffff, 0xffffffffffffffff, 0xffffffffffffffff};

int main(void)
{
  syscall(__NR_mmap, /*addr=*/0x1ffffffff000ul, /*len=*/0x1000, /*prot=*/0ul,
          /*flags=MAP_FIXED|MAP_ANONYMOUS|MAP_PRIVATE*/ 0x32ul,
          /*fd=*/(intptr_t)-1, /*offset=*/0ul);
  syscall(__NR_mmap, /*addr=*/0x200000000000ul, /*len=*/0x1000000,
          /*prot=PROT_WRITE|PROT_READ|PROT_EXEC*/ 7ul,
          /*flags=MAP_FIXED|MAP_ANONYMOUS|MAP_PRIVATE*/ 0x32ul,
          /*fd=*/(intptr_t)-1, /*offset=*/0ul);
  syscall(__NR_mmap, /*addr=*/0x200001000000ul, /*len=*/0x1000, /*prot=*/0ul,
          /*flags=MAP_FIXED|MAP_ANONYMOUS|MAP_PRIVATE*/ 0x32ul,
          /*fd=*/(intptr_t)-1, /*offset=*/0ul);
  const char* reason;
  (void)reason;
  install_segv_handler();
  intptr_t res = 0;
  if (write(1, "executing program\n", sizeof("executing program\n") - 1)) {
  }
  //  openat$ptmx arguments: [
  //    fd: const = 0xffffffffffffff9c (8 bytes)
  //    file: ptr[in, buffer] {
  //      buffer: {2f 64 65 76 2f 70 74 6d 78 00} (length 0xa)
  //    }
  //    flags: open_flags = 0x2 (4 bytes)
  //    mode: const = 0x0 (2 bytes)
  //  ]
  //  returns fd_tty
  NONFAILING(memcpy((void*)0x200000000040, "/dev/ptmx\000", 10));
  res = syscall(__NR_openat, /*fd=*/0xffffffffffffff9cul,
                /*file=*/0x200000000040ul, /*flags=O_RDWR*/ 2, /*mode=*/0);
  if (res != -1)
    r[0] = res;
  //  ioctl$TIOCSPTLCK arguments: [
  //    fd: fd_tty (resource)
  //    cmd: const = 0x40045431 (4 bytes)
  //    arg: ptr[in, int32] {
  //      int32 = 0x0 (4 bytes)
  //    }
  //  ]
  NONFAILING(*(uint32_t*)0x200000000080 = 0);
  syscall(__NR_ioctl, /*fd=*/r[0], /*cmd=*/0x40045431,
          /*arg=*/0x200000000080ul);
  //  syz_open_pts arguments: [
  //    fd: fd_tty (resource)
  //    flags: open_flags = 0x2 (8 bytes)
  //  ]
  //  returns fd_tty
  res = -1;
  NONFAILING(res = syz_open_pts(/*fd=*/r[0], /*flags=O_RDWR*/ 2));
  if (res != -1)
    r[1] = res;
  //  ioctl$TIOCSETD arguments: [
  //    fd: fd_tty (resource)
  //    cmd: const = 0x5423 (4 bytes)
  //    arg: ptr[in, int32] {
  //      int32 = 0x11 (4 bytes)
  //    }
  //  ]
  NONFAILING(*(uint32_t*)0x200000000100 = 0x11);
  syscall(__NR_ioctl, /*fd=*/r[1], /*cmd=*/0x5423, /*arg=*/0x200000000100ul);
  //  syz_init_net_socket$llc arguments: [
  //    domain: const = 0x1a (8 bytes)
  //    type: llc_socket_type = 0x2 (8 bytes)
  //    proto: const = 0x0 (8 bytes)
  //  ]
  //  returns sock_llc
  res = -1;
  NONFAILING(res = syz_init_net_socket(/*domain=*/0x1a, /*type=SOCK_DGRAM*/ 2,
                                       /*proto=*/0));
  if (res != -1)
    r[2] = res;
  //  ioctl arguments: [
  //    fd: fd (resource)
  //    cmd: int32 = 0x8914 (4 bytes)
  //    arg: ptr[in, buffer] {
  //      buffer: {63 61 6e 30 00 00 00 00 00 00 00 00 00 00 00 00 01 00 00 00
  //      00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00} (length
  //      0x28)
  //    }
  //  ]
  NONFAILING(memcpy((void*)0x200000000200,
                    "\x63\x61\x6e\x30\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
                    "\x00\x00\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
                    "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00",
                    40));
  syscall(__NR_ioctl, /*fd=*/r[2], /*cmd=*/0x8914, /*arg=*/0x200000000200ul);
  //  write arguments: [
  //    fd: fd (resource)
  //    buf: ptr[in, buffer] {
  //      buffer: {65 31 61 0d} (length 0x4)
  //    }
  //    count: len = 0x4 (8 bytes)
  //  ]
  NONFAILING(memcpy((void*)0x200000000300, "e1a\r", 4));
  syscall(__NR_write, /*fd=*/r[0], /*buf=*/0x200000000300ul, /*count=*/4ul);
  return 0;
}