// https://syzkaller.appspot.com/bug?id=5bc370225e1d2a3e0e16ac6806a3d85110f05275
// 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>

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[1] = {0x0};

int main(void)
{
  syscall(__NR_mmap, /*addr=*/0x1ffffffff000ul, /*len=*/0x1000ul, /*prot=*/0ul,
          /*flags=MAP_FIXED|MAP_ANONYMOUS|MAP_PRIVATE*/ 0x32ul,
          /*fd=*/(intptr_t)-1, /*offset=*/0ul);
  syscall(__NR_mmap, /*addr=*/0x200000000000ul, /*len=*/0x1000000ul,
          /*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=*/0x1000ul, /*prot=*/0ul,
          /*flags=MAP_FIXED|MAP_ANONYMOUS|MAP_PRIVATE*/ 0x32ul,
          /*fd=*/(intptr_t)-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)) {
  }
  //  mmap arguments: [
  //    addr: VMA[0x200000]
  //    len: len = 0x200000 (8 bytes)
  //    prot: mmap_prot = 0x300000b (8 bytes)
  //    flags: mmap_flags = 0x204031 (8 bytes)
  //    fd: fd (resource)
  //    offset: intptr = 0xec776000 (8 bytes)
  //  ]
  syscall(__NR_mmap, /*addr=*/0x200000000000ul, /*len=*/0x200000ul,
          /*prot=PROT_GROWSUP|PROT_GROWSDOWN|PROT_SEM|PROT_WRITE|PROT_READ*/
          0x300000bul,
          /*flags=MAP_NORESERVE|MAP_FIXED|MAP_ANONYMOUS|MAP_SHARED|0x200000*/
          0x204031ul, /*fd=*/(intptr_t)-1, /*offset=*/0xec776000ul);
  //  shmget$private arguments: [
  //    key: const = 0x0 (8 bytes)
  //    size: len = 0x800000 (8 bytes)
  //    flags: shmget_flags = 0x54003f00 (8 bytes)
  //    unused: VMA[0x800000]
  //  ]
  //  returns ipc_shm
  res = syscall(
      __NR_shmget, /*key=*/0ul, /*size=*/0x800000ul,
      /*flags=SHM_NORESERVE|SHM_HUGE_2MB|SHM_HUGETLB|IPC_EXCL|IPC_CREAT|0x2100*/
      0x54003f00ul, /*unused=*/0x200000800000ul);
  if (res != -1)
    r[0] = res;
  //  shmat arguments: [
  //    shmid: ipc_shm (resource)
  //    addr: VMA[0x4000]
  //    flags: shmat_flags = 0xbbdccba4532b703b (8 bytes)
  //  ]
  //  returns shmaddr
  inject_fault(9);
  syscall(__NR_shmat, /*shmid=*/r[0], /*addr=*/0x200000000000ul,
          /*flags=SHM_REMAP|SHM_RDONLY|SHM_RND|0xbbdccba4532b003b*/
          0xbbdccba4532b703bul);
  return 0;
}