syzkaller-repros/linux/ac6955dae93e824d682bb5112d4e8fee21020e1a.c

// general protection fault in loopback_pos_update
// https://syzkaller.appspot.com/bug?id=ac6955dae93e824d682bb5112d4e8fee21020e1a
// status:fixed
// autogenerated by syzkaller (http://github.com/google/syzkaller)

#define _GNU_SOURCE
#include <endian.h>
#include <errno.h>
#include <fcntl.h>
#include <linux/futex.h>
#include <pthread.h>
#include <signal.h>
#include <stdarg.h>
#include <stdio.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/prctl.h>
#include <sys/stat.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 uintptr_t syz_open_dev(uintptr_t a0, uintptr_t a1, uintptr_t a2)
{
  if (a0 == 0xc || a0 == 0xb) {
    char buf[128];
    sprintf(buf, "/dev/%s/%d:%d", a0 == 0xc ? "char" : "block", (uint8_t)a1,
            (uint8_t)a2);
    return open(buf, O_RDWR, 0);
  } else {
    char buf[1024];
    char* hash;
    strncpy(buf, (char*)a0, sizeof(buf));
    buf[sizeof(buf) - 1] = 0;
    while ((hash = strchr(buf, '#'))) {
      *hash = '0' + (char)(a1 % 10);
      a1 /= 10;
    }
    return open(buf, a2, 0);
  }
}

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;
      }
    }
  }
}

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;
      }
    }
  }
}

#ifndef __NR_ioctl
#define __NR_ioctl 54
#endif
#ifndef __NR_write
#define __NR_write 4
#endif
#ifndef __NR_writev
#define __NR_writev 146
#endif
#ifndef __NR_fcntl
#define __NR_fcntl 55
#endif
#ifndef __NR_readv
#define __NR_readv 145
#endif
#ifndef __NR_mmap
#define __NR_mmap 192
#endif
#ifndef __NR_getsockopt
#define __NR_getsockopt 365
#endif
#ifndef __NR_sendmmsg
#define __NR_sendmmsg 345
#endif
#ifndef __NR_setsockopt
#define __NR_setsockopt 366
#endif
#ifndef __NR_prctl
#define __NR_prctl 172
#endif
#ifndef __NR_read
#define __NR_read 3
#endif
#undef __NR_mmap
#define __NR_mmap __NR_mmap2

long r[3];
uint64_t procid;
void execute_call(int call)
{
  switch (call) {
  case 0:
    syscall(__NR_mmap, 0x20000000, 0xfff000, 3, 0x32, -1, 0);
    break;
  case 1:
    memcpy((void*)0x20000000, "/dev/adsp#", 11);
    r[0] = syz_open_dev(0x20000000, 1, 0x80801);
    break;
  case 2:
    *(uint32_t*)0x20005ff0 = 0;
    *(uint32_t*)0x20005ff4 = 0x50;
    *(uint32_t*)0x20005ff8 = 3;
    *(uint32_t*)0x20005ffc = 2;
    *(uint32_t*)0x20000ffc = 0x10;
    if (syscall(__NR_getsockopt, r[0], 0x84, 0, 0x20005ff0, 0x20000ffc) != -1)
      r[1] = *(uint32_t*)0x20005ff0;
    break;
  case 3:
    *(uint32_t*)0x20006f90 = 0;
    *(uint32_t*)0x20006f94 = 0;
    *(uint32_t*)0x20006f98 = 0x20006000;
    *(uint32_t*)0x20006f9c = 5;
    *(uint32_t*)0x20006fa0 = 0x20006fe8;
    *(uint32_t*)0x20006fa4 = 0x10;
    *(uint32_t*)0x20006fa8 = 0x4011;
    *(uint32_t*)0x20006fac = 0;
    *(uint32_t*)0x20006fb0 = 0;
    *(uint32_t*)0x20006fb4 = 0x20004fd0;
    *(uint32_t*)0x20006fb8 = 3;
    *(uint32_t*)0x20006fbc = 0x20001f88;
    *(uint32_t*)0x20006fc0 = 0x50;
    *(uint32_t*)0x20006fc4 = 0xc844;
    *(uint32_t*)0x20006000 = 0x20006ff0;
    *(uint32_t*)0x20006004 = 0;
    *(uint32_t*)0x20006008 = 0x20006000;
    *(uint32_t*)0x2000600c = 0;
    *(uint32_t*)0x20006010 = 0x20006fdd;
    *(uint32_t*)0x20006014 = 0;
    *(uint32_t*)0x20006018 = 0x20006fe7;
    *(uint32_t*)0x2000601c = 0;
    *(uint32_t*)0x20006020 = 0x20006000;
    *(uint32_t*)0x20006024 = 0xc3;
    memcpy((void*)0x20006000,
           "\x5c\x0d\x30\x13\xc6\x75\xa3\xb7\xf4\x8e\x5e\x45\x11\x01\xdd\xe9"
           "\x93\xe2\x77\x33\xb6\x5b\x7f\x13\x57\x39\xf9\x8b\x26\x35\xf1\x6a"
           "\x83\x2c\x37\x70\xac\xe9\xd1\x7d\xde\xcd\x1d\x42\x25\x94\x4c\xbb"
           "\x53\x4c\x7d\x83\x2b\xb6\xab\xaf\xd5\x46\xfc\x9a\x5b\xac\xb0\xf9"
           "\xda\xf2\xf6\x55\x5c\x41\xf6\x1f\x90\xf7\xf3\xfc\x7a\xa0\x2d\x8e"
           "\xf1\xe1\xb6\xbd\xf5\x12\x64\xde\x45\x1d\x6e\x1b\xd3\x40\x9a\x04"
           "\xe7\x20\xff\xaf\xef\x68\xa4\x20\x1d\x0d\xe6\x67\x6b\x50\x1f\x7a"
           "\x08\x0d\x73\xfe\x8d\x8f\x42\x42\xbb\x31\x29\x84\x6f\x2a\x06\x1c"
           "\xd6\x17\xfd\xaf\x00\x9d\x89\x2a\x94\xb6\xaa\x09\x7c\x7f\x43\x3e"
           "\xf7\xc7\x3b\x5a\x14\x73\x9e\x17\x50\xc7\xc9\xe2\x17\xcb\xec\xf6"
           "\xeb\x30\x63\xa6\x4a\x2a\x58\x30\x84\x47\x55\x01\xac\x61\x1b\x25"
           "\xab\x59\x69\x7f\x4e\x81\xf0\xe8\x3b\x60\xe6\xb8\x26\x9b\x6d\x1c"
           "\x31\xd1\x35",
           195);
    *(uint32_t*)0x20006fe8 = 0x10;
    *(uint32_t*)0x20006fec = 0x117;
    *(uint32_t*)0x20006ff0 = 4;
    *(uint32_t*)0x20006ff4 = 0x332;
    *(uint32_t*)0x20004fd0 = 0x20006000;
    *(uint32_t*)0x20004fd4 = 0;
    *(uint32_t*)0x20004fd8 = 0x20005f98;
    *(uint32_t*)0x20004fdc = 0;
    *(uint32_t*)0x20004fe0 = 0x20006f80;
    *(uint32_t*)0x20004fe4 = 0;
    *(uint32_t*)0x20001f88 = 0x10;
    *(uint32_t*)0x20001f8c = 0x117;
    *(uint32_t*)0x20001f90 = 3;
    *(uint32_t*)0x20001f94 = 1;
    *(uint32_t*)0x20001f98 = 0x10;
    *(uint32_t*)0x20001f9c = 0x117;
    *(uint32_t*)0x20001fa0 = 4;
    *(uint32_t*)0x20001fa4 = 0x1ff;
    *(uint32_t*)0x20001fa8 = 0x10;
    *(uint32_t*)0x20001fac = 0x117;
    *(uint32_t*)0x20001fb0 = 3;
    *(uint32_t*)0x20001fb4 = 1;
    *(uint32_t*)0x20001fb8 = 0x10;
    *(uint32_t*)0x20001fbc = 0x117;
    *(uint32_t*)0x20001fc0 = 4;
    *(uint32_t*)0x20001fc4 = 9;
    *(uint32_t*)0x20001fc8 = 0x10;
    *(uint32_t*)0x20001fcc = 0x117;
    *(uint32_t*)0x20001fd0 = 4;
    *(uint32_t*)0x20001fd4 = 6;
    syscall(__NR_sendmmsg, r[0], 0x20006f90, 2, 1);
    break;
  case 4:
    *(uint32_t*)0x20004ffc = r[1];
    syscall(__NR_setsockopt, r[0], 0x84, 0xd, 0x20004ffc, 4);
    break;
  case 5:
    *(uint32_t*)0x20001ff4 = 0x6238;
    *(uint32_t*)0x20001ff8 = 4;
    *(uint32_t*)0x20001ffc = 6;
    syscall(__NR_ioctl, r[0], 0xc008551c, 0x20001ff4);
    break;
  case 6:
    *(uint16_t*)0x20000ff0 = 3;
    *(uint32_t*)0x20000ff4 = 0x20000000;
    *(uint16_t*)0x20000000 = 0;
    *(uint8_t*)0x20000002 = -1;
    *(uint8_t*)0x20000003 = 7;
    *(uint32_t*)0x20000004 = 7;
    *(uint16_t*)0x20000008 = 8;
    *(uint8_t*)0x2000000a = 1;
    *(uint8_t*)0x2000000b = 0x20;
    *(uint32_t*)0x2000000c = 2;
    *(uint16_t*)0x20000010 = 0xfffe;
    *(uint8_t*)0x20000012 = 1;
    *(uint8_t*)0x20000013 = 0x65;
    *(uint32_t*)0x20000014 = 0x8000;
    syscall(__NR_prctl, 0x16, 0, 0x20000ff0);
    break;
  case 7:
    syscall(__NR_writev, r[0], 0x20004fe0, 1);
    break;
  case 8:
    syscall(__NR_setsockopt, r[0], 0, 0x27, 0x20007fdc, 0);
    break;
  case 9:
    *(uint64_t*)0x20000ff8 = 0;
    syscall(__NR_write, r[0], 0x20000ff8, 0xffffffa1);
    break;
  case 10:
    *(uint64_t*)0x20003ff8 = 5;
    syscall(__NR_fcntl, r[0], 0x40c, 0x20003ff8);
    break;
  case 11:
    memcpy((void*)0x20008000, "/dev/dsp#", 10);
    r[2] = syz_open_dev(0x20008000, 1, 0);
    break;
  case 12:
    syscall(__NR_fcntl, r[2], 0xa, 0xc);
    break;
  case 13:
    *(uint32_t*)0x2054bff0 = 0x20006f07;
    *(uint32_t*)0x2054bff4 = 0xf9;
    syscall(__NR_readv, r[2], 0x2054bff0, 1);
    break;
  case 14:
    syscall(__NR_read, r[2], 0x20ec0000, 0);
    break;
  }
}

void test()
{
  memset(r, -1, sizeof(r));
  execute(15);
  collide = 1;
  execute(15);
}

int main()
{
  for (procid = 0; procid < 8; procid++) {
    if (fork() == 0) {
      for (;;) {
        loop();
      }
    }
  }
  sleep(1000000);
  return 0;
}