syzkaller-repros/linux/3acd1155d48a5acc5d76711568b04926945a6885.c

// KASAN: slab-out-of-bounds Read in bacpy
// https://syzkaller.appspot.com/bug?id=3acd1155d48a5acc5d76711568b04926945a6885
// 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 <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 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();
}

#define SYZ_HAVE_RESET_TEST 1
static void reset_test()
{
  int fd;
  for (fd = 3; fd < 30; fd++)
    close(fd);
}

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();
      reset_test();
      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*)0x200000c0, "/dev/vhci\x00", 10);
  res = syscall(__NR_openat, 0xffffffffffffff9c, 0x200000c0, 0x8401, 0);
  if (res != -1)
    r[0] = res;
  *(uint8_t*)0x20000100 = -1;
  *(uint8_t*)0x20000101 = 0;
  syscall(__NR_write, r[0], 0x20000100, 2);
  *(uint8_t*)0x20000240 = 4;
  memcpy((void*)0x20000241,
         "\x22\x55\xe5\x14\xac\x7d\xc0\x19\xce\x06\x64\x51\x0d\x4c\x3c\x5d\x09"
         "\x1a\xc4\x10\x17\x62\x04\xc2\x01\x50\x81\xac\x70\x7d\x4e\x36\xb8\x7a"
         "\x60\xce\x7a\x4c\x0e\xb0\xcf\x82\xf4\x08\x74\xa4\x69\xed\x08\x0a\xc6"
         "\xba\x10\x17\x3d\xf3\x87\x6e\x0d\xfd\x0e\x16\x3f\xc2\xb7\x7d\x8f\x42"
         "\xb8\xfb\x15\xc0\xd4\x89\x58\xf3\x18\x3b\x6b\xd5\xf6\x7e\x1f\x26\xbf"
         "\x1d\x3a\x2f\xab\x54\x48\xdf\x30\x60\xa6\x70\x34\x6c\x0b",
         99);
  syscall(__NR_write, r[0], 0x20000240, 0x64);
}
int main(void)
{
  syscall(__NR_mmap, 0x20000000, 0x1000000, 3, 0x32, -1, 0);
  loop();
  return 0;
}