syzkaller-repros/linux/86a8e2ab50527d5a5eb4fad2fc15df609f22d86a.c

// WARNING: kobject bug in netdev_queue_update_kobjects
// https://syzkaller.appspot.com/bug?id=86a8e2ab50527d5a5eb4fad2fc15df609f22d86a
// status:fixed
// autogenerated by syzkaller (http://github.com/google/syzkaller)

#define _GNU_SOURCE
#include <endian.h>
#include <errno.h>
#include <fcntl.h>
#include <fcntl.h>
#include <stdarg.h>
#include <stdbool.h>
#include <stdio.h>
#include <stdio.h>
#include <string.h>
#include <sys/stat.h>
#include <sys/stat.h>
#include <sys/syscall.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 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 uintptr_t syz_open_dev(uintptr_t a0, uintptr_t a1, uintptr_t a2)
{
  if (a0 == 0xc || a0 == 0xb) {
    char buf[128];
    sprintf(buf, "/dev/%s/%d:%d", a0 == 0xc ? "char" : "block", (uint8_t)a1,
            (uint8_t)a2);
    return open(buf, O_RDWR, 0);
  } else {
    char buf[1024];
    char* hash;
    strncpy(buf, (char*)a0, sizeof(buf));
    buf[sizeof(buf) - 1] = 0;
    while ((hash = strchr(buf, '#'))) {
      *hash = '0' + (char)(a1 % 10);
      a1 /= 10;
    }
    return open(buf, a2, 0);
  }
}

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) {
    close(fd);
    return false;
  }
  close(fd);
  return true;
}

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;
}

static void test();

void loop()
{
  while (1) {
    test();
  }
}

uint64_t r[2] = {0xffffffffffffffff, 0xffffffffffffffff};
void test()
{
  long res;
  memcpy((void*)0x20000100, "/dev/net/tun", 13);
  res = syz_open_dev(0x20000100, 0, 0);
  if (res != -1)
    r[0] = res;
  memcpy((void*)0x200000c0,
         "\xd2\x02\xb9\x99\xcf\x85\x00\x00\x00\x00\x00\x88\xf3\x01\xe7\x10",
         16);
  *(uint16_t*)0x200000d0 = 0x102;
  syscall(__NR_ioctl, r[0], 0x400454ca, 0x200000c0);
  memcpy((void*)0x20000140,
         "\x76\x68\x61\x6e\x30\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00",
         16);
  *(uint16_t*)0x20000150 = 0x400;
  syscall(__NR_ioctl, r[0], 0x400454d9, 0x20000140);
  memcpy((void*)0x20000280, "/dev/net/tun", 13);
  res = syz_open_dev(0x20000280, 0, 0);
  if (res != -1)
    r[1] = res;
  memcpy((void*)0x200000c0,
         "\xd2\x02\xb9\x99\xcf\x85\x00\x00\x00\x00\x00\x88\xf3\x01\xe7\x10",
         16);
  *(uint16_t*)0x200000d0 = 0x102;
  syscall(__NR_ioctl, r[1], 0x400454ca, 0x200000c0);
  memcpy((void*)0x20000200,
         "\x05\x00\x00\x00\x00\xe7\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00",
         16);
  *(uint16_t*)0x20000210 = 0x200;
  write_file("/sys/kernel/debug/failslab/ignore-gfp-wait", "N");
  write_file("/sys/kernel/debug/fail_futex/ignore-private", "N");
  inject_fault(1);
  syscall(__NR_ioctl, r[0], 0x400454d9, 0x20000200);
}

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