syzkaller-repros/linux/851b2e1240c041deebd364954dad4d67252ad013.c

// KASAN: use-after-free Read in __dev_remove_pack
// https://syzkaller.appspot.com/bug?id=851b2e1240c041deebd364954dad4d67252ad013
// status:invalid
// autogenerated by syzkaller (http://github.com/google/syzkaller)

#define _GNU_SOURCE

#include <errno.h>
#include <pthread.h>
#include <signal.h>
#include <stdarg.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/prctl.h>
#include <sys/syscall.h>
#include <sys/time.h>
#include <sys/wait.h>
#include <time.h>
#include <unistd.h>

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

__attribute__((noreturn)) static void doexit(int status)
{
  volatile unsigned i;
  syscall(__NR_exit_group, status);
  for (i = 0;; i++) {
  }
}

__attribute__((noreturn)) static void fail(const char* msg, ...)
{
  int e = errno;
  fflush(stdout);
  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);
}

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

static uint64_t current_time_ms()
{
  struct timespec ts;

  if (clock_gettime(CLOCK_MONOTONIC, &ts))
    fail("clock_gettime failed");
  return (uint64_t)ts.tv_sec * 1000 + (uint64_t)ts.tv_nsec / 1000000;
}

static void test();

void loop()
{
  int iter;
  for (iter = 0;; iter++) {
    int pid = fork();
    if (pid < 0)
      fail("clone failed");
    if (pid == 0) {
      prctl(PR_SET_PDEATHSIG, SIGKILL, 0, 0, 0);
      setpgrp();
      test();
      doexit(0);
    }
    int status = 0;
    uint64_t start = current_time_ms();
    for (;;) {
      int res = waitpid(-1, &status, __WALL | WNOHANG);
      if (res == pid)
        break;
      usleep(1000);
      if (current_time_ms() - start > 5 * 1000) {
        kill(-pid, SIGKILL);
        kill(pid, SIGKILL);
        while (waitpid(-1, &status, __WALL) != pid) {
        }
        break;
      }
    }
  }
}

long r[14];
void* thr(void* arg)
{
  switch ((long)arg) {
  case 0:
    r[0] = syscall(__NR_mmap, 0x20000000ul, 0xfff000ul, 0x3ul, 0x32ul,
                   0xfffffffffffffffful, 0x0ul);
    break;
  case 1:
    *(uint32_t*)0x20001000 = (uint32_t)0x10000;
    *(uint32_t*)0x20001004 = (uint32_t)0xc000800000000001;
    *(uint32_t*)0x20001008 = (uint32_t)0x10000;
    *(uint32_t*)0x2000100c = (uint32_t)0x1;
    r[5] = syscall(__NR_setsockopt, 0xfffffffffffffffful, 0x84ul, 0x0ul,
                   0x20001000ul, 0x10ul);
    break;
  case 2:
    r[6] = syscall(__NR_getrlimit, 0xbul, 0x203d3ff0ul);
    break;
  case 3:
    r[7] = syscall(__NR_socket, 0x11ul, 0x80003ul, 0x8ul);
    break;
  case 4:
    r[8] = syscall(__NR_semget, 0x0ul, 0x1ul, 0x41ul);
    break;
  case 5:
    *(uint16_t*)0x208e3000 = (uint16_t)0x0;
    *(uint8_t*)0x208e3002 = (uint8_t)0x4;
    *(uint8_t*)0x208e3003 = (uint8_t)0x8ffd;
    r[12] = syscall(__NR_setsockopt, r[7], 0x107ul, 0x12ul,
                    0x208e3000ul, 0x4ul);
    break;
  case 6:
    r[13] = syscall(__NR_setsockopt, r[7], 0x107ul, 0x5ul, 0x20001000ul,
                    0x47eul);
    break;
  }
  return 0;
}

void test()
{
  long i;
  pthread_t th[14];

  memset(r, -1, sizeof(r));
  srand(getpid());
  for (i = 0; i < 7; i++) {
    pthread_create(&th[i], 0, thr, (void*)i);
    usleep(rand() % 10000);
  }
  for (i = 0; i < 7; i++) {
    pthread_create(&th[7 + i], 0, thr, (void*)i);
    if (rand() % 2)
      usleep(rand() % 10000);
  }
  usleep(rand() % 100000);
}

int main()
{
  int i;
  for (i = 0; i < 8; i++) {
    if (fork() == 0) {
      loop();
      return 0;
    }
  }
  sleep(1000000);
  return 0;
}