syzkaller-repros/linux/406e8923b864c8454494e6a3d61c50dbd962d37c.c

// general protection fault in crypto_remove_spawns
// https://syzkaller.appspot.com/bug?id=406e8923b864c8454494e6a3d61c50dbd962d37c
// status:fixed
// 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("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;
      }
    }
  }
}

#ifndef __NR_mmap
#define __NR_mmap 192
#endif
#ifndef __NR_socket
#define __NR_socket 359
#endif
#ifndef __NR_bind
#define __NR_bind 361
#endif
#undef __NR_mmap
#define __NR_mmap __NR_mmap2

long r[15];
void* thr(void* arg)
{
  switch ((long)arg) {
  case 0:
    r[0] = syscall(__NR_mmap, 0x20000000ul, 0xfff000ul, 0x3ul, 0x32ul,
                   0xfffffffffffffffful, 0x0ul);
    break;
  case 1:
    r[1] = syscall(__NR_socket, 0x26ul, 0x5ul, 0x0ul);
    break;
  case 2:
    *(uint16_t*)0x20000000 = (uint16_t)0x26;
    memcpy((void*)0x20000002,
           "\x68\x61\x73\x68\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00",
           14);
    *(uint32_t*)0x20000010 = (uint32_t)0x20;
    *(uint32_t*)0x20000014 = (uint32_t)0xffffffffffffffff;
    memcpy((void*)0x20000018,
           "\x63\x6d\x61\x63\x28\x64\x65\x73\x33\x5f\x65\x64\x65\x29"
           "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
           "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
           "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
           "\x00\x00\x00\x00\x00\x00\x00\x00",
           64);
    r[7] = syscall(__NR_bind, r[1], 0x20000000ul, 0x58ul);
    break;
  case 3:
    r[8] = syscall(__NR_socket, 0x26ul, 0x5ul, 0x0ul);
    break;
  case 4:
    *(uint16_t*)0x20000fa8 = (uint16_t)0x26;
    memcpy((void*)0x20000faa,
           "\x61\x65\x61\x64\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00",
           14);
    *(uint32_t*)0x20000fb8 = (uint32_t)0x0;
    *(uint32_t*)0x20000fbc = (uint32_t)0x0;
    memcpy((void*)0x20000fc0,
           "\x61\x75\x74\x68\x65\x6e\x63\x28\x63\x6d\x61\x63\x28\x64"
           "\x65\x73\x33\x5f\x65\x64\x65\x2d\x61\x73\x6d\x29\x2c\x70"
           "\x63\x62\x63\x2d\x61\x65\x73\x2d\x61\x65\x73\x6e\x69\x29"
           "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
           "\x00\x00\x00\x00\x00\x00\x00\x00",
           64);
    r[14] = syscall(__NR_bind, r[8], 0x20000fa8ul, 0x58ul);
    break;
  }
  return 0;
}

void test()
{
  long i;
  pthread_t th[10];

  memset(r, -1, sizeof(r));
  srand(getpid());
  for (i = 0; i < 5; i++) {
    pthread_create(&th[i], 0, thr, (void*)i);
    usleep(rand() % 10000);
  }
  for (i = 0; i < 5; i++) {
    pthread_create(&th[5 + i], 0, thr, (void*)i);
    if (rand() % 2)
      usleep(rand() % 10000);
  }
  usleep(rand() % 100000);
}

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