syzkaller-repros/linux/9198c791f35f64dbe61a21856fe70bede729b9e6.c

// KASAN: stack-out-of-bounds Read in strnlen
// https://syzkaller.appspot.com/bug?id=9198c791f35f64dbe61a21856fe70bede729b9e6
// status:open
// autogenerated by syzkaller (http://github.com/google/syzkaller)

#define _GNU_SOURCE

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

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

#include <stdint.h>
#include <string.h>

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

static void fail(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((e == ENOMEM || e == EAGAIN) ? kRetryStatus : kFailStatus);
}

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("loop fork 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[1];
void* thr(void* arg)
{
  switch ((long)arg) {
  case 0:
    syscall(__NR_mmap, 0x20000000ul, 0x3000ul, 0x3ul, 0x32ul,
            0xfffffffffffffffful, 0x0ul);
    break;
  case 1:
    r[0] = syscall(__NR_socket, 0x2ul, 0x2ul, 0x0ul);
    break;
  case 2:
    memcpy((void*)0x20000000,
           "\x97\xb3\x7e\x40\xec\x2c\xc1\xed\xde\x9e\xe7\xb9\x1f\x3a"
           "\xd4\xe6\x90\xb0\x1c\x00\x80\x00\x56\x9c\xa3\x3a\x5c\x00"
           "\x00\x00\x00\x80\x00\x00\x01\x41\x05\x1a\x91\xb5\x57\x69"
           "\xd7\x46\x7c\x3b\x19\x43\x96\x5c\xb5\xf7\x75\x22\x8d\xa1"
           "\xd4\xfe\xb3\x85\x00\x1e\x0b\x5d\x03\xc3\xa5\xb3",
           68);
    syscall(__NR_setsockopt, r[0], 0x0ul, 0x489ul, 0x20000000ul,
            0x44ul);
    break;
  case 3:
    *(uint32_t*)0x20000000 = (uint32_t)0x0;
    *(uint32_t*)0x20000004 = (uint32_t)0x72;
    memcpy((void*)0x20000008,
           "\x20\xeb\x74\x07\xcc\x00\x53\x2c\xc3\xd5\x6e\x7a\x27\x05"
           "\xfa\x0b\x87\x9b\x36\x77\xa8\x40\x5e\xf8\x4f\x71\x37\xe9"
           "\x20\x93\x18\xad\xe8\x81\xa1\x63\xb2\x9a\xba\x9b\xf8\xcc"
           "\x3c\x1e\xc6\x22\x60\xcb\xa3\x5b\x54\xc3\x55\x4c\x5c\x64"
           "\x8f\x2a\x57\xc9\x3a\x42\xa0\x47\x7c\x03\x9a\xd1\x04\x3b"
           "\xd5\xc3\x89\x79\x2b\x22\x5a\x24\xc3\x3e\xce\xd7\x25\x34"
           "\x7e\xae\x27\xa4\x46\x1d\x6d\x67\x60\xd7\x0c\xb8\x87\x18"
           "\xa2\xfb\x8a\x4a\x56\xea\x7f\xa9\x26\x14\xa6\xc0\x1f\xdd"
           "\xc6\x77",
           114);
    *(uint32_t*)0x20000ffc = (uint32_t)0x7a;
    syscall(__NR_getsockopt, 0xffffffffffffff9cul, 0x84ul, 0x1bul,
            0x20000000ul, 0x20000ffcul);
    break;
  }
  return 0;
}

void test()
{
  long i;
  pthread_t th[8];

  memset(r, -1, sizeof(r));
  srand(getpid());
  for (i = 0; i < 4; i++) {
    pthread_create(&th[i], 0, thr, (void*)i);
    usleep(rand() % 10000);
  }
  for (i = 0; i < 4; i++) {
    pthread_create(&th[4 + i], 0, thr, (void*)i);
    if (rand() % 2)
      usleep(rand() % 10000);
  }
  usleep(rand() % 100000);
}

int main()
{
  loop();
  return 0;
}