syzkaller-repros/linux/ba55d69152d4549df2ba6ce6bf8da25d8881598b.c

// DATA RACE in shm.(*Registry).findByKey
// https://syzkaller.appspot.com/bug?id=ba55d69152d4549df2ba6ce6bf8da25d8881598b
// status:fixed
// autogenerated by syzkaller (http://github.com/google/syzkaller)

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

__attribute__((noreturn)) static void doexit(int status)
{
  volatile unsigned i;
  syscall(__NR_exit_group, status);
  for (i = 0;; i++) {
  }
}
#include <setjmp.h>
#include <signal.h>
#include <stdint.h>
#include <string.h>
#include <string.h>

static __thread int skip_segv;
static __thread jmp_buf segv_env;

static void segv_handler(int sig, siginfo_t* info, void* uctx)
{
  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);
  }
  doexit(sig);
}

static void install_segv_handler()
{
  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 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 int collide;

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);
        if (collide && call % 2)
          break;
        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, 0x0};
unsigned long long procid;
void execute_call(int call)
{
  long res;
  switch (call) {
  case 0:
    syscall(__NR_munmap, 0x20000000, 0x2000);
    break;
  case 1:
    res = syscall(__NR_socketpair, 1, 2, 0, 0x200024c0);
    if (res != -1)
      NONFAILING(r[0] = *(uint32_t*)0x200024c0);
    break;
  case 2:
    NONFAILING(*(uint64_t*)0x20005c00 = 0x20000080);
    NONFAILING(*(uint32_t*)0x20005c08 = 0x80);
    NONFAILING(*(uint64_t*)0x20005c10 = 0x20000300);
    NONFAILING(*(uint64_t*)0x20000300 = 0x20000100);
    NONFAILING(*(uint64_t*)0x20000308 = 0x15);
    NONFAILING(*(uint64_t*)0x20000310 = 0x20000140);
    NONFAILING(*(uint64_t*)0x20000318 = 0xae);
    NONFAILING(*(uint64_t*)0x20000320 = 0x20000200);
    NONFAILING(*(uint64_t*)0x20000328 = 0x64);
    NONFAILING(*(uint64_t*)0x20000330 = 0x20000280);
    NONFAILING(*(uint64_t*)0x20000338 = 0x67);
    NONFAILING(*(uint64_t*)0x20005c18 = 4);
    NONFAILING(*(uint64_t*)0x20005c20 = 0x20000340);
    NONFAILING(*(uint64_t*)0x20005c28 = 0x80);
    NONFAILING(*(uint32_t*)0x20005c30 = 0xd6);
    NONFAILING(*(uint32_t*)0x20005c38 = 0x1f);
    NONFAILING(*(uint64_t*)0x20005c40 = 0);
    NONFAILING(*(uint32_t*)0x20005c48 = 0);
    NONFAILING(*(uint64_t*)0x20005c50 = 0x20000700);
    NONFAILING(*(uint64_t*)0x20000700 = 0x200003c0);
    NONFAILING(*(uint64_t*)0x20000708 = 0xbd);
    NONFAILING(*(uint64_t*)0x20000710 = 0x20000480);
    NONFAILING(*(uint64_t*)0x20000718 = 0xc3);
    NONFAILING(*(uint64_t*)0x20000720 = 0x20000580);
    NONFAILING(*(uint64_t*)0x20000728 = 0x6c);
    NONFAILING(*(uint64_t*)0x20000730 = 0x20000600);
    NONFAILING(*(uint64_t*)0x20000738 = 0xdf);
    NONFAILING(*(uint64_t*)0x20005c58 = 4);
    NONFAILING(*(uint64_t*)0x20005c60 = 0x20000740);
    NONFAILING(*(uint64_t*)0x20005c68 = 0xa7);
    NONFAILING(*(uint32_t*)0x20005c70 = 0x401);
    NONFAILING(*(uint32_t*)0x20005c78 = 6);
    NONFAILING(*(uint64_t*)0x20005c80 = 0x20000800);
    NONFAILING(*(uint32_t*)0x20005c88 = 0x80);
    NONFAILING(*(uint64_t*)0x20005c90 = 0x20001a00);
    NONFAILING(*(uint64_t*)0x20001a00 = 0x20000880);
    NONFAILING(*(uint64_t*)0x20001a08 = 0x26);
    NONFAILING(*(uint64_t*)0x20001a10 = 0x200008c0);
    NONFAILING(*(uint64_t*)0x20001a18 = 0x1000);
    NONFAILING(*(uint64_t*)0x20001a20 = 0x20002500);
    NONFAILING(*(uint64_t*)0x20001a28 = 0x1000);
    NONFAILING(*(uint64_t*)0x20001a30 = 0x200018c0);
    NONFAILING(*(uint64_t*)0x20001a38 = 0xd1);
    NONFAILING(*(uint64_t*)0x20001a40 = 0x200019c0);
    NONFAILING(*(uint64_t*)0x20001a48 = 7);
    NONFAILING(*(uint64_t*)0x20005c98 = 5);
    NONFAILING(*(uint64_t*)0x20005ca0 = 0x20001a80);
    NONFAILING(*(uint64_t*)0x20005ca8 = 0x68);
    NONFAILING(*(uint32_t*)0x20005cb0 = 2);
    NONFAILING(*(uint32_t*)0x20005cb8 = 7);
    NONFAILING(*(uint64_t*)0x20005cc0 = 0x20001b00);
    NONFAILING(*(uint32_t*)0x20005cc8 = 0x80);
    NONFAILING(*(uint64_t*)0x20005cd0 = 0x20001f00);
    NONFAILING(*(uint64_t*)0x20001f00 = 0x20001b80);
    NONFAILING(*(uint64_t*)0x20001f08 = 0x8d);
    NONFAILING(*(uint64_t*)0x20001f10 = 0x20003500);
    NONFAILING(*(uint64_t*)0x20001f18 = 0x1000);
    NONFAILING(*(uint64_t*)0x20001f20 = 0x20001c40);
    NONFAILING(*(uint64_t*)0x20001f28 = 0x8e);
    NONFAILING(*(uint64_t*)0x20001f30 = 0x20001d00);
    NONFAILING(*(uint64_t*)0x20001f38 = 0xca);
    NONFAILING(*(uint64_t*)0x20001f40 = 0x20001e00);
    NONFAILING(*(uint64_t*)0x20001f48 = 0xa3);
    NONFAILING(*(uint64_t*)0x20001f50 = 0x20001ec0);
    NONFAILING(*(uint64_t*)0x20001f58 = 0xc);
    NONFAILING(*(uint64_t*)0x20005cd8 = 6);
    NONFAILING(*(uint64_t*)0x20005ce0 = 0x20001f80);
    NONFAILING(*(uint64_t*)0x20005ce8 = 0xcf);
    NONFAILING(*(uint32_t*)0x20005cf0 = 9);
    NONFAILING(*(uint32_t*)0x20005cf8 = 2);
    NONFAILING(*(uint64_t*)0x20005d00 = 0x20002080);
    NONFAILING(*(uint32_t*)0x20005d08 = 0x80);
    NONFAILING(*(uint64_t*)0x20005d10 = 0x200023c0);
    NONFAILING(*(uint64_t*)0x200023c0 = 0x20002100);
    NONFAILING(*(uint64_t*)0x200023c8 = 0xda);
    NONFAILING(*(uint64_t*)0x200023d0 = 0x20002200);
    NONFAILING(*(uint64_t*)0x200023d8 = 0xdc);
    NONFAILING(*(uint64_t*)0x200023e0 = 0x20002300);
    NONFAILING(*(uint64_t*)0x200023e8 = 0xa8);
    NONFAILING(*(uint64_t*)0x20005d18 = 3);
    NONFAILING(*(uint64_t*)0x20005d20 = 0x20002400);
    NONFAILING(*(uint64_t*)0x20005d28 = 0xac);
    NONFAILING(*(uint32_t*)0x20005d30 = 0xfffffff8);
    NONFAILING(*(uint32_t*)0x20005d38 = 4);
    NONFAILING(*(uint64_t*)0x20005d40 = 0x20004500);
    NONFAILING(*(uint32_t*)0x20005d48 = 0x80);
    NONFAILING(*(uint64_t*)0x20005d50 = 0x20005b40);
    NONFAILING(*(uint64_t*)0x20005b40 = 0x20004580);
    NONFAILING(*(uint64_t*)0x20005b48 = 0x4d);
    NONFAILING(*(uint64_t*)0x20005b50 = 0x20004600);
    NONFAILING(*(uint64_t*)0x20005b58 = 0xcf);
    NONFAILING(*(uint64_t*)0x20005b60 = 0x20004700);
    NONFAILING(*(uint64_t*)0x20005b68 = 0xcb);
    NONFAILING(*(uint64_t*)0x20005b70 = 0x20004800);
    NONFAILING(*(uint64_t*)0x20005b78 = 0x37);
    NONFAILING(*(uint64_t*)0x20005b80 = 0x20004840);
    NONFAILING(*(uint64_t*)0x20005b88 = 0x1000);
    NONFAILING(*(uint64_t*)0x20005b90 = 0x20005840);
    NONFAILING(*(uint64_t*)0x20005b98 = 0xea);
    NONFAILING(*(uint64_t*)0x20005ba0 = 0x20005940);
    NONFAILING(*(uint64_t*)0x20005ba8 = 0x53);
    NONFAILING(*(uint64_t*)0x20005bb0 = 0x200059c0);
    NONFAILING(*(uint64_t*)0x20005bb8 = 7);
    NONFAILING(*(uint64_t*)0x20005bc0 = 0x20005a00);
    NONFAILING(*(uint64_t*)0x20005bc8 = 0x93);
    NONFAILING(*(uint64_t*)0x20005bd0 = 0x20005ac0);
    NONFAILING(*(uint64_t*)0x20005bd8 = 0x7b);
    NONFAILING(*(uint64_t*)0x20005d58 = 0xa);
    NONFAILING(*(uint64_t*)0x20005d60 = 0);
    NONFAILING(*(uint64_t*)0x20005d68 = 0);
    NONFAILING(*(uint32_t*)0x20005d70 = 6);
    NONFAILING(*(uint32_t*)0x20005d78 = 1);
    NONFAILING(*(uint64_t*)0x20005d80 = 0);
    NONFAILING(*(uint64_t*)0x20005d88 = 0x989680);
    syscall(__NR_recvmmsg, r[0], 0x20005c00, 6, 0x40000000, 0x20005d80);
    break;
  case 3:
    NONFAILING(memcpy(
        (void*)0x20000040,
        "\x73\x79\x7a\x6b\x61\x6c\x6c\x65\x72\x31\x00\x00\x00\x00\x00\x00",
        16));
    NONFAILING(*(uint16_t*)0x20000050 = 2);
    NONFAILING(*(uint16_t*)0x20000052 = htobe16(0x4e20));
    NONFAILING(*(uint32_t*)0x20000054 = htobe32(0x1f));
    NONFAILING(*(uint8_t*)0x20000058 = 0);
    NONFAILING(*(uint8_t*)0x20000059 = 0);
    NONFAILING(*(uint8_t*)0x2000005a = 0);
    NONFAILING(*(uint8_t*)0x2000005b = 0);
    NONFAILING(*(uint8_t*)0x2000005c = 0);
    NONFAILING(*(uint8_t*)0x2000005d = 0);
    NONFAILING(*(uint8_t*)0x2000005e = 0);
    NONFAILING(*(uint8_t*)0x2000005f = 0);
    syscall(__NR_ioctl, r[0], 0x8917, 0x20000040);
    break;
  case 4:
    res = syscall(__NR_shmget, 0, 0x1000, 0x230, 0x20002000);
    if (res != -1)
      r[1] = res;
    break;
  case 5:
    syscall(__NR_shmctl, r[1], 0);
    break;
  case 6:
    syscall(__NR_shmget, 0x798dd813 + procid * 4, 0x2000, 4, 0x20001000);
    break;
  }
}

void execute_one()
{
  execute(7);
  collide = 1;
  execute(7);
}

int main()
{
  syscall(__NR_mmap, 0x20000000, 0x1000000, 3, 0x32, -1, 0);
  for (procid = 0; procid < 4; procid++) {
    if (fork() == 0) {
      install_segv_handler();
      for (;;) {
        loop();
      }
    }
  }
  sleep(1000000);
  return 0;
}