syzkaller-repros/linux/20461e24e6d47cb591e04bed283907f38ee50633.c

// kernel BUG at fs/super.c:LINE!
// https://syzkaller.appspot.com/bug?id=20461e24e6d47cb591e04bed283907f38ee50633
// status:invalid
// autogenerated by syzkaller (http://github.com/google/syzkaller)

#define _GNU_SOURCE
#include <endian.h>
#include <errno.h>
#include <errno.h>
#include <errno.h>
#include <fcntl.h>
#include <fcntl.h>
#include <sched.h>
#include <signal.h>
#include <stdarg.h>
#include <stdarg.h>
#include <stdbool.h>
#include <stdbool.h>
#include <stdio.h>
#include <stdio.h>
#include <sys/prctl.h>
#include <sys/resource.h>
#include <sys/stat.h>
#include <sys/stat.h>
#include <sys/syscall.h>
#include <sys/time.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <unistd.h>

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

const int kFailStatus = 67;
const int kRetryStatus = 69;

static void fail(const char* msg, ...)
{
  int e = errno;
  va_list args;
  va_start(args, msg);
  vfprintf(stderr, msg, args);
  va_end(args);
  fprintf(stderr, " (errno %d)\n", e);
  doexit((e == ENOMEM || e == EAGAIN) ? kRetryStatus : kFailStatus);
}

static void exitf(const char* msg, ...)
{
  int e = errno;
  va_list args;
  va_start(args, msg);
  vfprintf(stderr, msg, args);
  va_end(args);
  fprintf(stderr, " (errno %d)\n", e);
  doexit(kRetryStatus);
}

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 void loop();

static void sandbox_common()
{
  prctl(PR_SET_PDEATHSIG, SIGKILL, 0, 0, 0);
  setpgrp();
  setsid();

  struct rlimit rlim;
  rlim.rlim_cur = rlim.rlim_max = 160 << 20;
  setrlimit(RLIMIT_AS, &rlim);
  rlim.rlim_cur = rlim.rlim_max = 8 << 20;
  setrlimit(RLIMIT_MEMLOCK, &rlim);
  rlim.rlim_cur = rlim.rlim_max = 136 << 20;
  setrlimit(RLIMIT_FSIZE, &rlim);
  rlim.rlim_cur = rlim.rlim_max = 1 << 20;
  setrlimit(RLIMIT_STACK, &rlim);
  rlim.rlim_cur = rlim.rlim_max = 0;
  setrlimit(RLIMIT_CORE, &rlim);

  if (unshare(CLONE_NEWNS)) {
  }
  if (unshare(CLONE_NEWIPC)) {
  }
  if (unshare(0x02000000)) {
  }
  if (unshare(CLONE_NEWUTS)) {
  }
  if (unshare(CLONE_SYSVSEM)) {
  }
}

int wait_for_loop(int pid)
{
  if (pid < 0)
    fail("sandbox fork failed");
  int status = 0;
  while (waitpid(-1, &status, __WALL) != pid) {
  }
  return WEXITSTATUS(status);
}

static int do_sandbox_none(void)
{
  if (unshare(CLONE_NEWPID)) {
  }
  int pid = fork();
  if (pid != 0)
    return wait_for_loop(pid);

  sandbox_common();
  if (unshare(CLONE_NEWNET)) {
  }
  loop();
  doexit(1);
}

static int inject_fault(int nth)
{
  int fd;
  char buf[16];

  fd = open("/proc/thread-self/fail-nth", O_RDWR);
  if (fd == -1)
    exitf("failed to open /proc/thread-self/fail-nth");
  sprintf(buf, "%d", nth + 1);
  if (write(fd, buf, strlen(buf)) != (ssize_t)strlen(buf))
    exitf("failed to write /proc/thread-self/fail-nth");
  return fd;
}

uint64_t r[1] = {0xffffffffffffffff};
void loop()
{
  long res = 0;
  memcpy((void*)0x20000000, "./file0", 8);
  syscall(__NR_mkdir, 0x20000000, 0);
  memcpy((void*)0x2000a000, "./file0", 8);
  memcpy((void*)0x20026ff8, "./file0", 8);
  memcpy((void*)0x20000300, "ramfs", 6);
  syscall(__NR_mount, 0x2000a000, 0x20026ff8, 0x20000300, 0, 0x200007c0);
  memcpy((void*)0x20d04000, "./file0", 8);
  memcpy((void*)0x20903000, "./file0", 8);
  memcpy((void*)0x20000340, "bdev", 5);
  syscall(__NR_mount, 0x20d04000, 0x20903000, 0x20000340, 0x100000, 0x200002c0);
  res = syscall(__NR_socket, 0xa, 0x1000000000002, 0);
  if (res != -1)
    r[0] = res;
  syscall(__NR_ioctl, r[0], 0x8912, 0x20000280);
  memcpy((void*)0x20000000, "./file0", 8);
  memcpy((void*)0x200000c0, ".", 1);
  memcpy((void*)0x20000140, "vxfs", 5);
  syscall(__NR_mount, 0x20000000, 0x200000c0, 0x20000140, 0x3080, 0x20000200);
  memcpy((void*)0x200008c0, ".", 1);
  memcpy((void*)0x20000080, ".", 1);
  memcpy((void*)0x20753000, "mslos", 6);
  syscall(__NR_mount, 0x200008c0, 0x20000080, 0x20753000, 0x5010, 0x20000ac0);
  memcpy((void*)0x20377ff8, ".", 1);
  memcpy((void*)0x20187ff8, ".", 1);
  memcpy((void*)0x20753000, "mslos", 6);
  syscall(__NR_mount, 0x20377ff8, 0x20187ff8, 0x20753000, 0x5010, 0x200e7000);
  memcpy((void*)0x20000000, "./file0", 8);
  memcpy((void*)0x200000c0, "./file0", 8);
  memcpy((void*)0x20000280,
         "\x73\x79\x73\x66\x73\x00\x2a\x86\x4f\x4b\xc0\x0b\xce\x1b\xdb\x20\x63"
         "\x72\x13\xb1\xe8\x94\xd1\x20\x71\x5f\x9d\xc1\x12\x5b\x04\x2c\x72\x26"
         "\xeb\x01\x36\xd9\x62\x4e\xa1\xd2\x33\x74\xa6\x60\xfe\x5a\xc1\x73\x72"
         "\x2f\xd3\x67\xad\x22\xe8\x55\x30\x25\xa2\xe8\xbe\x0b\xc5\x51\x43\x79"
         "\xaf\x72\x13\xd3\x2b\x8d\x5d\x06\xdc\x8f\xbf\x2c\x84\x9e\xd9\xcd\xef"
         "\xc7\x4b\x03\xdf\xa9\xcb\x5a\x90\xb2\x8b\x4b\x24\xd7\x86\x2c\x3d\x66"
         "\xfc\xa5\x31\x67\xd5\x42\x42\x35\x43\x5a\x3d\xbb\x76\xbc\x7d\x3c\x42"
         "\xfc\x2e\x9c\x69\x61\x14\xa6\xf8\x88\xf0\xda\x85\x27\x76\x83\xcf\xc1"
         "\xc4\xd2\xbf\x71\xc2\x55\xa3\x13\x4d\x64\xcc\x3f\xed\x8e\x97\x79\x8d"
         "\xeb\x86\x31\xcb\xf7\x68\x2c\x9f\xa2\xed\x03\x14\x65\xaa\x19\x1d\xf9"
         "\x22\xf7\x64\x29\x7c\xba\x22\xa8\x49\x9d\x17\x7f\x49\xfb\xa9\x40\xf5"
         "\x5b\xbc\x8b\x72\x3f\xd3\x74\xf1\xfe\xd7\x8c\x8a\xee\xc6\x81\x1d\x9b"
         "\x58\x79\x48\x73\x87\xd5\x65\x94\xa1\x4c\x25\x88\x27\x4d\xe8\x4f\xa2"
         "\x76\x10\x30\x2b\x3f\xb5\x41\x72\xa8\xc9\x10\xa0\x7e\x7c\x76\xea\x46"
         "\x5a\xa6\x84\x02",
         242);
  write_file("/sys/kernel/debug/failslab/ignore-gfp-wait", "N");
  write_file("/sys/kernel/debug/fail_futex/ignore-private", "N");
  inject_fault(9);
  syscall(__NR_mount, 0x20000000, 0x200000c0, 0x20000280, 0, 0x20000180);
}

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