// https://syzkaller.appspot.com/bug?id=227dacf4ecb82baa36f1bf342342ef1456d7b24c
// autogenerated by syzkaller (https://github.com/google/syzkaller)

#define _GNU_SOURCE

#include <endian.h>
#include <errno.h>
#include <fcntl.h>
#include <stdarg.h>
#include <stdbool.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/stat.h>
#include <sys/syscall.h>
#include <sys/types.h>
#include <unistd.h>

#ifndef __NR_bpf
#define __NR_bpf 321
#endif

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 int inject_fault(int nth)
{
  int fd;
  fd = open("/proc/thread-self/fail-nth", O_RDWR);
  if (fd == -1)
    exit(1);
  char buf[16];
  sprintf(buf, "%d", nth);
  if (write(fd, buf, strlen(buf)) != (ssize_t)strlen(buf))
    exit(1);
  return fd;
}

static const char* setup_fault()
{
  int fd = open("/proc/self/make-it-fail", O_WRONLY);
  if (fd == -1)
    return "CONFIG_FAULT_INJECTION is not enabled";
  close(fd);
  fd = open("/proc/thread-self/fail-nth", O_WRONLY);
  if (fd == -1)
    return "kernel does not have systematic fault injection support";
  close(fd);
  static struct {
    const char* file;
    const char* val;
    bool fatal;
  } files[] = {
      {"/sys/kernel/debug/failslab/ignore-gfp-wait", "N", true},
      {"/sys/kernel/debug/fail_futex/ignore-private", "N", false},
      {"/sys/kernel/debug/fail_page_alloc/ignore-gfp-highmem", "N", false},
      {"/sys/kernel/debug/fail_page_alloc/ignore-gfp-wait", "N", false},
      {"/sys/kernel/debug/fail_page_alloc/min-order", "0", false},
  };
  unsigned i;
  for (i = 0; i < sizeof(files) / sizeof(files[0]); i++) {
    if (!write_file(files[i].file, files[i].val)) {
      if (files[i].fatal)
        return "failed to write fault injection file";
    }
  }
  return NULL;
}

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

int main(void)
{
  syscall(__NR_mmap, /*addr=*/0x1ffff000ul, /*len=*/0x1000ul, /*prot=*/0ul,
          /*flags=MAP_FIXED|MAP_ANONYMOUS|MAP_PRIVATE*/ 0x32ul, /*fd=*/-1,
          /*offset=*/0ul);
  syscall(__NR_mmap, /*addr=*/0x20000000ul, /*len=*/0x1000000ul,
          /*prot=PROT_WRITE|PROT_READ|PROT_EXEC*/ 7ul,
          /*flags=MAP_FIXED|MAP_ANONYMOUS|MAP_PRIVATE*/ 0x32ul, /*fd=*/-1,
          /*offset=*/0ul);
  syscall(__NR_mmap, /*addr=*/0x21000000ul, /*len=*/0x1000ul, /*prot=*/0ul,
          /*flags=MAP_FIXED|MAP_ANONYMOUS|MAP_PRIVATE*/ 0x32ul, /*fd=*/-1,
          /*offset=*/0ul);
  const char* reason;
  (void)reason;
  if ((reason = setup_fault()))
    printf("the reproducer may not work as expected: fault injection setup "
           "failed: %s\n",
           reason);
  intptr_t res = 0;
  if (write(1, "executing program\n", sizeof("executing program\n") - 1)) {
  }
  memcpy((void*)0x20000140, "/dev/ptmx\000", 10);
  res = syscall(__NR_openat, /*fd=*/0xffffffffffffff9cul, /*file=*/0x20000140ul,
                /*flags=O_SYNC*/ 0x101000, /*mode=*/0);
  if (res != -1)
    r[0] = res;
  *(uint32_t*)0x20000080 = 3;
  syscall(__NR_ioctl, /*fd=*/r[0], /*cmd=*/0x5423, /*arg=*/0x20000080ul);
  *(uint32_t*)0x20000180 = 1;
  *(uint32_t*)0x20000184 = 0;
  *(uint64_t*)0x20000188 = 0;
  *(uint64_t*)0x20000190 = 0;
  *(uint32_t*)0x20000198 = 0;
  *(uint32_t*)0x2000019c = 0;
  *(uint64_t*)0x200001a0 = 0;
  *(uint32_t*)0x200001a8 = 0x40f00;
  *(uint32_t*)0x200001ac = 4;
  memset((void*)0x200001b0, 0, 16);
  *(uint32_t*)0x200001c0 = 0;
  *(uint32_t*)0x200001c4 = 0;
  *(uint32_t*)0x200001c8 = -1;
  *(uint32_t*)0x200001cc = 8;
  *(uint64_t*)0x200001d0 = 0;
  *(uint32_t*)0x200001d8 = 0;
  *(uint32_t*)0x200001dc = 0x10;
  *(uint64_t*)0x200001e0 = 0;
  *(uint32_t*)0x200001e8 = 0;
  *(uint32_t*)0x200001ec = -1;
  *(uint32_t*)0x200001f0 = -1;
  *(uint32_t*)0x200001f4 = 0;
  *(uint64_t*)0x200001f8 = 0;
  *(uint64_t*)0x20000200 = 0;
  *(uint32_t*)0x20000208 = 0x10;
  *(uint32_t*)0x2000020c = 0;
  *(uint32_t*)0x20000210 = 0;
  syscall(__NR_bpf, /*cmd=*/5ul, /*arg=*/0x20000180ul, /*size=*/0x90ul);
  memcpy((void*)0x20000040, "/dev/ppp\000", 9);
  res =
      syscall(__NR_openat, /*fd=*/0xffffffffffffff9cul, /*file=*/0x20000040ul,
              /*flags=O_TRUNC|O_NONBLOCK|O_WRONLY|0x1000*/ 0x1a01, /*mode=*/0);
  if (res != -1)
    r[1] = res;
  syscall(__NR_ioctl, /*fd=*/r[1], /*cmd=*/0x40047438, /*arg=*/0x20000180ul);
  res = syscall(__NR_dup, /*oldfd=*/r[1]);
  if (res != -1)
    r[2] = res;
  *(uint8_t*)0x200002c0 = 0;
  memcpy((void*)0x200002c1, "freezer", 7);
  *(uint8_t*)0x200002c8 = 0x20;
  inject_fault(4);
  syscall(__NR_write, /*fd=*/r[2], /*buf=*/0x200002c0ul, /*len=*/9ul);
  return 0;
}