syzkaller-repros/linux/24bc7f3022b8fd1d99c48aec3e0bcac1628968e9.c

// INFO: task hung in lock_sock_nested
// https://syzkaller.appspot.com/bug?id=24bc7f3022b8fd1d99c48aec3e0bcac1628968e9
// status:dup
// autogenerated by syzkaller (https://github.com/google/syzkaller)

#define _GNU_SOURCE

#include <dirent.h>
#include <endian.h>
#include <errno.h>
#include <fcntl.h>
#include <pthread.h>
#include <setjmp.h>
#include <signal.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/ioctl.h>
#include <sys/mount.h>
#include <sys/prctl.h>
#include <sys/socket.h>
#include <sys/stat.h>
#include <sys/syscall.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <time.h>
#include <unistd.h>

#include <linux/futex.h>
#include <linux/genetlink.h>
#include <linux/netlink.h>

unsigned long long procid;

static __thread int skip_segv;
static __thread jmp_buf segv_env;

static void segv_handler(int sig, siginfo_t* info, void* ctx)
{
  uintptr_t addr = (uintptr_t)info->si_addr;
  const uintptr_t prog_start = 1 << 20;
  const uintptr_t prog_end = 100 << 20;
  if (__atomic_load_n(&skip_segv, __ATOMIC_RELAXED) &&
      (addr < prog_start || addr > prog_end)) {
    _longjmp(segv_env, 1);
  }
  exit(sig);
}

static void install_segv_handler(void)
{
  struct sigaction sa;
  memset(&sa, 0, sizeof(sa));
  sa.sa_handler = SIG_IGN;
  syscall(SYS_rt_sigaction, 0x20, &sa, NULL, 8);
  syscall(SYS_rt_sigaction, 0x21, &sa, NULL, 8);
  memset(&sa, 0, sizeof(sa));
  sa.sa_sigaction = segv_handler;
  sa.sa_flags = SA_NODEFER | SA_SIGINFO;
  sigaction(SIGSEGV, &sa, NULL);
  sigaction(SIGBUS, &sa, NULL);
}

#define NONFAILING(...)                                                        \
  {                                                                            \
    __atomic_fetch_add(&skip_segv, 1, __ATOMIC_SEQ_CST);                       \
    if (_setjmp(segv_env) == 0) {                                              \
      __VA_ARGS__;                                                             \
    }                                                                          \
    __atomic_fetch_sub(&skip_segv, 1, __ATOMIC_SEQ_CST);                       \
  }

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 use_temporary_dir(void)
{
  char tmpdir_template[] = "./syzkaller.XXXXXX";
  char* tmpdir = mkdtemp(tmpdir_template);
  if (!tmpdir)
    exit(1);
  if (chmod(tmpdir, 0777))
    exit(1);
  if (chdir(tmpdir))
    exit(1);
}

static void thread_start(void* (*fn)(void*), void* arg)
{
  pthread_t th;
  pthread_attr_t attr;
  pthread_attr_init(&attr);
  pthread_attr_setstacksize(&attr, 128 << 10);
  if (pthread_create(&th, &attr, fn, arg))
    exit(1);
  pthread_attr_destroy(&attr);
}

typedef struct {
  int state;
} event_t;

static void event_init(event_t* ev)
{
  ev->state = 0;
}

static void event_reset(event_t* ev)
{
  ev->state = 0;
}

static void event_set(event_t* ev)
{
  if (ev->state)
    exit(1);
  __atomic_store_n(&ev->state, 1, __ATOMIC_RELEASE);
  syscall(SYS_futex, &ev->state, FUTEX_WAKE | FUTEX_PRIVATE_FLAG);
}

static void event_wait(event_t* ev)
{
  while (!__atomic_load_n(&ev->state, __ATOMIC_ACQUIRE))
    syscall(SYS_futex, &ev->state, FUTEX_WAIT | FUTEX_PRIVATE_FLAG, 0, 0);
}

static int event_isset(event_t* ev)
{
  return __atomic_load_n(&ev->state, __ATOMIC_ACQUIRE);
}

static int event_timedwait(event_t* ev, uint64_t timeout)
{
  uint64_t start = current_time_ms();
  uint64_t now = start;
  for (;;) {
    uint64_t remain = timeout - (now - start);
    struct timespec ts;
    ts.tv_sec = remain / 1000;
    ts.tv_nsec = (remain % 1000) * 1000 * 1000;
    syscall(SYS_futex, &ev->state, FUTEX_WAIT | FUTEX_PRIVATE_FLAG, 0, &ts);
    if (__atomic_load_n(&ev->state, __ATOMIC_RELAXED))
      return 1;
    now = current_time_ms();
    if (now - start > timeout)
      return 0;
  }
}

static long syz_genetlink_get_family_id(long name)
{
  char buf[512] = {0};
  struct nlmsghdr* hdr = (struct nlmsghdr*)buf;
  struct genlmsghdr* genlhdr = (struct genlmsghdr*)NLMSG_DATA(hdr);
  struct nlattr* attr = (struct nlattr*)(genlhdr + 1);
  hdr->nlmsg_len =
      sizeof(*hdr) + sizeof(*genlhdr) + sizeof(*attr) + GENL_NAMSIZ;
  hdr->nlmsg_type = GENL_ID_CTRL;
  hdr->nlmsg_flags = NLM_F_REQUEST | NLM_F_ACK;
  genlhdr->cmd = CTRL_CMD_GETFAMILY;
  attr->nla_type = CTRL_ATTR_FAMILY_NAME;
  attr->nla_len = sizeof(*attr) + GENL_NAMSIZ;
  NONFAILING(strncpy((char*)(attr + 1), (char*)name, GENL_NAMSIZ));
  struct iovec iov = {hdr, hdr->nlmsg_len};
  struct sockaddr_nl addr = {0};
  addr.nl_family = AF_NETLINK;
  int fd = socket(AF_NETLINK, SOCK_RAW, NETLINK_GENERIC);
  if (fd == -1) {
    return -1;
  }
  struct msghdr msg = {&addr, sizeof(addr), &iov, 1, NULL, 0, 0};
  if (sendmsg(fd, &msg, 0) == -1) {
    close(fd);
    return -1;
  }
  ssize_t n = recv(fd, buf, sizeof(buf), 0);
  close(fd);
  if (n <= 0) {
    return -1;
  }
  if (hdr->nlmsg_type != GENL_ID_CTRL) {
    return -1;
  }
  for (; (char*)attr < buf + n;
       attr = (struct nlattr*)((char*)attr + NLMSG_ALIGN(attr->nla_len))) {
    if (attr->nla_type == CTRL_ATTR_FAMILY_ID)
      return *(uint16_t*)(attr + 1);
  }
  return -1;
}

#define FS_IOC_SETFLAGS _IOW('f', 2, long)
static void remove_dir(const char* dir)
{
  DIR* dp;
  struct dirent* ep;
  int iter = 0;
retry:
  while (umount2(dir, MNT_DETACH) == 0) {
  }
  dp = opendir(dir);
  if (dp == NULL) {
    if (errno == EMFILE) {
      exit(1);
    }
    exit(1);
  }
  while ((ep = readdir(dp))) {
    if (strcmp(ep->d_name, ".") == 0 || strcmp(ep->d_name, "..") == 0)
      continue;
    char filename[FILENAME_MAX];
    snprintf(filename, sizeof(filename), "%s/%s", dir, ep->d_name);
    while (umount2(filename, MNT_DETACH) == 0) {
    }
    struct stat st;
    if (lstat(filename, &st))
      exit(1);
    if (S_ISDIR(st.st_mode)) {
      remove_dir(filename);
      continue;
    }
    int i;
    for (i = 0;; i++) {
      if (unlink(filename) == 0)
        break;
      if (errno == EPERM) {
        int fd = open(filename, O_RDONLY);
        if (fd != -1) {
          long flags = 0;
          if (ioctl(fd, FS_IOC_SETFLAGS, &flags) == 0)
            close(fd);
          continue;
        }
      }
      if (errno == EROFS) {
        break;
      }
      if (errno != EBUSY || i > 100)
        exit(1);
      if (umount2(filename, MNT_DETACH))
        exit(1);
    }
  }
  closedir(dp);
  int i;
  for (i = 0;; i++) {
    if (rmdir(dir) == 0)
      break;
    if (i < 100) {
      if (errno == EPERM) {
        int fd = open(dir, O_RDONLY);
        if (fd != -1) {
          long flags = 0;
          if (ioctl(fd, FS_IOC_SETFLAGS, &flags) == 0)
            close(fd);
          continue;
        }
      }
      if (errno == EROFS) {
        break;
      }
      if (errno == EBUSY) {
        if (umount2(dir, MNT_DETACH))
          exit(1);
        continue;
      }
      if (errno == ENOTEMPTY) {
        if (iter < 100) {
          iter++;
          goto retry;
        }
      }
    }
    exit(1);
  }
}

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);
}

struct thread_t {
  int created, call;
  event_t ready, done;
};

static struct thread_t threads[16];
static void execute_call(int call);
static int running;

static void* thr(void* arg)
{
  struct thread_t* th = (struct thread_t*)arg;
  for (;;) {
    event_wait(&th->ready);
    event_reset(&th->ready);
    execute_call(th->call);
    __atomic_fetch_sub(&running, 1, __ATOMIC_RELAXED);
    event_set(&th->done);
  }
  return 0;
}

static void execute_one(void)
{
  int i, call, thread;
  int collide = 0;
again:
  for (call = 0; call < 17; call++) {
    for (thread = 0; thread < (int)(sizeof(threads) / sizeof(threads[0]));
         thread++) {
      struct thread_t* th = &threads[thread];
      if (!th->created) {
        th->created = 1;
        event_init(&th->ready);
        event_init(&th->done);
        event_set(&th->done);
        thread_start(thr, th);
      }
      if (!event_isset(&th->done))
        continue;
      event_reset(&th->done);
      th->call = call;
      __atomic_fetch_add(&running, 1, __ATOMIC_RELAXED);
      event_set(&th->ready);
      if (collide && (call % 2) == 0)
        break;
      event_timedwait(&th->done, 45);
      break;
    }
  }
  for (i = 0; i < 100 && __atomic_load_n(&running, __ATOMIC_RELAXED); i++)
    sleep_ms(1);
  if (!collide) {
    collide = 1;
    goto again;
  }
}

static void execute_one(void);

#define WAIT_FLAGS __WALL

static void loop(void)
{
  int iter;
  for (iter = 0;; iter++) {
    char cwdbuf[32];
    sprintf(cwdbuf, "./%d", iter);
    if (mkdir(cwdbuf, 0777))
      exit(1);
    int pid = fork();
    if (pid < 0)
      exit(1);
    if (pid == 0) {
      if (chdir(cwdbuf))
        exit(1);
      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;
    }
    remove_dir(cwdbuf);
  }
}

uint64_t r[2] = {0xffffffffffffffff, 0xffffffffffffffff};

void execute_call(int call)
{
  long res;
  switch (call) {
  case 0:
    NONFAILING(memcpy((void*)0x20000100, "/dev/qat_adf_ctl", 17));
    syscall(__NR_openat, 0xffffffffffffff9c, 0x20000100, 0x40000, 0);
    break;
  case 1:
    NONFAILING(memcpy((void*)0x20000240, "team", 5));
    syz_genetlink_get_family_id(0x20000240);
    break;
  case 2:
    NONFAILING(memcpy(
        (void*)0x20000740,
        "\x74\x65\x61\x6d\x30\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00",
        16));
    NONFAILING(*(uint32_t*)0x20000750 = 0);
    syscall(__NR_ioctl, 0xffffff9c, 0x8933, 0x20000740);
    break;
  case 3:
    NONFAILING(memcpy(
        (void*)0x20000780,
        "\x69\x72\x6c\x61\x6e\x30\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00",
        16));
    NONFAILING(*(uint32_t*)0x20000790 = 0);
    syscall(__NR_ioctl, 0xffffff9c, 0x8933, 0x20000780);
    break;
  case 4:
    NONFAILING(memcpy(
        (void*)0x200007c0,
        "\x74\x65\x61\x6d\x30\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00",
        16));
    NONFAILING(*(uint32_t*)0x200007d0 = 0);
    syscall(__NR_ioctl, 0xffffff9c, 0x8933, 0x200007c0);
    break;
  case 5:
    NONFAILING(*(uint32_t*)0x20000900 = 0xe8);
    syscall(__NR_getsockopt, -1, 0x29, 0x22, 0x20000800, 0x20000900);
    break;
  case 6:
    NONFAILING(*(uint32_t*)0x20001300 = 0x14);
    syscall(__NR_getpeername, 0xffffff9c, 0x200012c0, 0x20001300);
    break;
  case 7:
    NONFAILING(memcpy(
        (void*)0x20001440,
        "\x79\x61\x6d\x30\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00",
        16));
    NONFAILING(*(uint32_t*)0x20001450 = 0);
    syscall(__NR_ioctl, 0xffffff9c, 0x8933, 0x20001440);
    break;
  case 8:
    NONFAILING(*(uint32_t*)0x20001580 = 0xe8);
    syscall(__NR_getsockopt, -1, 0, 0x11, 0x20001480, 0x20001580);
    break;
  case 9:
    res = syscall(__NR_socket, 0xa, 1, 0x84);
    if (res != -1)
      r[0] = res;
    break;
  case 10:
    NONFAILING(*(uint16_t*)0x20ef8cfd = 0xa);
    NONFAILING(*(uint16_t*)0x20ef8cff = htobe16(0x4e23));
    NONFAILING(*(uint32_t*)0x20ef8d01 = 0);
    NONFAILING(*(uint64_t*)0x20ef8d05 = htobe64(0));
    NONFAILING(*(uint64_t*)0x20ef8d0d = htobe64(1));
    NONFAILING(*(uint32_t*)0x20ef8d15 = 0);
    syscall(__NR_bind, r[0], 0x20ef8cfd, 0x1c);
    break;
  case 11:
    syscall(__NR_listen, r[0], 7);
    break;
  case 12:
    res = syscall(__NR_socket, 0xa, 1, 0x84);
    if (res != -1)
      r[1] = res;
    break;
  case 13:
    NONFAILING(memcpy((void*)0x20000000, "\xf8", 1));
    NONFAILING(*(uint16_t*)0x2005ffe4 = 0xa);
    NONFAILING(*(uint16_t*)0x2005ffe6 = htobe16(0x4e23));
    NONFAILING(*(uint32_t*)0x2005ffe8 = 0);
    NONFAILING(*(uint64_t*)0x2005ffec = htobe64(0));
    NONFAILING(*(uint64_t*)0x2005fff4 = htobe64(1));
    NONFAILING(*(uint32_t*)0x2005fffc = 0);
    syscall(__NR_sendto, r[1], 0x20000000, 1, 0, 0x2005ffe4, 0x1c);
    break;
  case 14:
    NONFAILING(*(uint32_t*)0x20000140 = 0);
    NONFAILING(*(uint16_t*)0x20000144 = 0xa);
    NONFAILING(*(uint16_t*)0x20000146 = htobe16(0));
    NONFAILING(*(uint32_t*)0x20000148 = 0);
    NONFAILING(*(uint8_t*)0x2000014c = 0);
    NONFAILING(*(uint8_t*)0x2000014d = 0);
    NONFAILING(*(uint8_t*)0x2000014e = 0);
    NONFAILING(*(uint8_t*)0x2000014f = 0);
    NONFAILING(*(uint8_t*)0x20000150 = 0);
    NONFAILING(*(uint8_t*)0x20000151 = 0);
    NONFAILING(*(uint8_t*)0x20000152 = 0);
    NONFAILING(*(uint8_t*)0x20000153 = 0);
    NONFAILING(*(uint8_t*)0x20000154 = 0);
    NONFAILING(*(uint8_t*)0x20000155 = 0);
    NONFAILING(*(uint8_t*)0x20000156 = 0);
    NONFAILING(*(uint8_t*)0x20000157 = 0);
    NONFAILING(*(uint8_t*)0x20000158 = 0);
    NONFAILING(*(uint8_t*)0x20000159 = 0);
    NONFAILING(*(uint8_t*)0x2000015a = 0);
    NONFAILING(*(uint8_t*)0x2000015b = 0);
    NONFAILING(*(uint32_t*)0x2000015c = 0);
    NONFAILING(*(uint32_t*)0x200001c4 = 0);
    NONFAILING(*(uint16_t*)0x200001c8 = 0);
    NONFAILING(*(uint32_t*)0x200001ca = 0x8000);
    NONFAILING(*(uint32_t*)0x200001ce = 0);
    NONFAILING(*(uint32_t*)0x200001d2 = 0x11);
    syscall(__NR_setsockopt, r[1], 0x84, 9, 0x20000140, 0x98);
    break;
  case 15:
    syscall(__NR_setsockopt, r[0], 0x29, 0x2b, 0x20000040, 0);
    break;
  case 16:
    NONFAILING(memcpy((void*)0x200002c0,
                      "\x5b\xca\xe2\xdd\x88\x7c\xf0\x85\xbb\xd0\xf4\x5b\x01\x39"
                      "\xb0\x03\x7b\xc7\xf7\xb2\xc9\x57\x96\x3f\xcb\xca\x1c\xcf"
                      "\x9d\x0d\xc5\x89\x6c\x59\xbe\xfb\xb1\xcd\x9d\x25\x74\x89"
                      "\x55\x37\x04\x6c\xa1\x64\x16\x65\xf9\xef\xad\xdc\xee\x62"
                      "\x73\xaf\x61\x5b\xd2\x53\x29\x23\x1c\xc4\x04\x83",
                      68));
    syscall(__NR_write, r[1], 0x200002c0, 0x44);
    break;
  }
}
int main(void)
{
  syscall(__NR_mmap, 0x20000000, 0x1000000, 3, 0x32, -1, 0);
  install_segv_handler();
  for (procid = 0; procid < 6; procid++) {
    if (fork() == 0) {
      use_temporary_dir();
      loop();
    }
  }
  sleep(1000000);
  return 0;
}