syzkaller-repros/linux/4712504ef4bb053d06e34bb53eb22e237cdc5da8.c

// KASAN: slab-out-of-bounds Read in hci_event_packet
// https://syzkaller.appspot.com/bug?id=4712504ef4bb053d06e34bb53eb22e237cdc5da8
// status:open
// autogenerated by syzkaller (https://github.com/google/syzkaller)

#define _GNU_SOURCE

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

static void sleep_ms(uint64_t ms)
{
  usleep(ms * 1000);
}

static uint64_t current_time_ms(void)
{
  struct timespec ts;
  if (clock_gettime(CLOCK_MONOTONIC, &ts))
    exit(1);
  return (uint64_t)ts.tv_sec * 1000 + (uint64_t)ts.tv_nsec / 1000000;
}

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 kill_and_wait(int pid, int* status)
{
  kill(-pid, SIGKILL);
  kill(pid, SIGKILL);
  int i;
  for (i = 0; i < 100; i++) {
    if (waitpid(-1, status, WNOHANG | __WALL) == pid)
      return;
    usleep(1000);
  }
  DIR* dir = opendir("/sys/fs/fuse/connections");
  if (dir) {
    for (;;) {
      struct dirent* ent = readdir(dir);
      if (!ent)
        break;
      if (strcmp(ent->d_name, ".") == 0 || strcmp(ent->d_name, "..") == 0)
        continue;
      char abort[300];
      snprintf(abort, sizeof(abort), "/sys/fs/fuse/connections/%s/abort",
               ent->d_name);
      int fd = open(abort, O_WRONLY);
      if (fd == -1) {
        continue;
      }
      if (write(fd, abort, 1) < 0) {
      }
      close(fd);
    }
    closedir(dir);
  } else {
  }
  while (waitpid(-1, status, __WALL) != pid) {
  }
}

#define SYZ_HAVE_SETUP_TEST 1
static void setup_test()
{
  prctl(PR_SET_PDEATHSIG, SIGKILL, 0, 0, 0);
  setpgrp();
  write_file("/proc/self/oom_score_adj", "1000");
}

static void execute_one(void);

#define WAIT_FLAGS __WALL

static void loop(void)
{
  int iter;
  for (iter = 0;; iter++) {
    int pid = fork();
    if (pid < 0)
      exit(1);
    if (pid == 0) {
      setup_test();
      execute_one();
      exit(0);
    }
    int status = 0;
    uint64_t start = current_time_ms();
    for (;;) {
      if (waitpid(-1, &status, WNOHANG | WAIT_FLAGS) == pid)
        break;
      sleep_ms(1);
      if (current_time_ms() - start < 5 * 1000)
        continue;
      kill_and_wait(pid, &status);
      break;
    }
  }
}

uint64_t r[1] = {0xffffffffffffffff};

void execute_one(void)
{
  long res = 0;
  memcpy((void*)0x20000000, "/dev/vhci\000", 10);
  res = syscall(__NR_openat, 0xffffffffffffff9c, 0x20000000, 2, 0);
  if (res != -1)
    r[0] = res;
  *(uint8_t*)0x20000200 = -1;
  *(uint8_t*)0x20000201 = 0;
  syscall(__NR_write, r[0], 0x20000200, 2);
  *(uint8_t*)0x20000180 = 4;
  memcpy((void*)0x20000181,
         "\x22\x78\xa6\x70\x8f\xbc\x5d\xe9\xed\xf7\x43\x40\x67\x90\x8f\x77\x55"
         "\xae\xc4\x03\x42\xc7\x89\x25\x72\x80\x3f\x83\xb8\xaf\x48\xc8\x6f\xdc"
         "\xb1\x8e\x87\x23\x48\x80\xe1\xa3\x76\x1a\xf2\xde\x2a\x7c\xb8\xe1\xbe"
         "\x2b\x72\xb4\x78\x7a\x5c\x4a\xca\xcf\x16\xe0\x16\xe6\xd9\x02\x5b\x6c"
         "\x57\xb1\xa1\x6f\xae\x5d\x71\x3f\x87\x1e\xec\x42\x66\xf0\xfc\xc6\x44"
         "\xb7\xcd\xee\x65\x6d\xe1\x33\x23",
         93);
  syscall(__NR_write, r[0], 0x20000180, 0x5e);
}
int main(void)
{
  syscall(__NR_mmap, 0x20000000, 0x1000000, 3, 0x32, -1, 0);
  loop();
  return 0;
}