syzkaller-repros/linux/b443d21f7f64a6aeefd046bae43d1be8803e8810.c

// general protection fault in sg_remove_scat
// https://syzkaller.appspot.com/bug?id=b443d21f7f64a6aeefd046bae43d1be8803e8810
// status:fixed
// autogenerated by syzkaller (http://github.com/google/syzkaller)

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

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 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[3] = {0xffffffffffffffff, 0x0, 0xffffffffffffffff};
unsigned long long procid;
void execute_call(int call)
{
  long res;
  switch (call) {
  case 0:
    *(uint64_t*)0x20000000 = 0x20ffc000;
    *(uint64_t*)0x20000008 = 0;
    *(uint32_t*)0x20000010 = 0;
    *(uint32_t*)0x20000014 = 0;
    *(uint64_t*)0x20000018 = 0x20fff000;
    *(uint32_t*)0x20000020 = 0;
    syscall(__NR_ioctl, -1, 0x4028641b, 0x20000000);
    break;
  case 1:
    memcpy((void*)0x20000040, "/dev/keychord", 14);
    res = syscall(__NR_openat, 0xffffffffffffff9c, 0x20000040, 0x40, 0);
    if (res != -1)
      r[0] = res;
    break;
  case 2:
    *(uint64_t*)0x20001780 = 0;
    *(uint32_t*)0x20001788 = 0;
    *(uint64_t*)0x20001790 = 0x200016c0;
    *(uint64_t*)0x200016c0 = 0x20000280;
    *(uint64_t*)0x200016c8 = 0x2e;
    *(uint64_t*)0x200016d0 = 0x20000340;
    *(uint64_t*)0x200016d8 = 0xe0;
    *(uint64_t*)0x200016e0 = 0x20000440;
    *(uint64_t*)0x200016e8 = 0xee;
    *(uint64_t*)0x200016f0 = 0x20000540;
    *(uint64_t*)0x200016f8 = 0x1000;
    *(uint64_t*)0x20001700 = 0x20001540;
    *(uint64_t*)0x20001708 = 0xaa;
    *(uint64_t*)0x20001710 = 0x20001600;
    *(uint64_t*)0x20001718 = 0x88;
    *(uint64_t*)0x20001798 = 6;
    *(uint64_t*)0x200017a0 = 0x20001740;
    *(uint64_t*)0x200017a8 = 0x26;
    *(uint32_t*)0x200017b0 = 0x1000;
    syscall(__NR_recvmsg, r[0], 0x20001780, 0x10020);
    break;
  case 3:
    *(uint32_t*)0x20001b40 = 0xe8;
    res = syscall(__NR_getsockopt, r[0], 0x29, 0x23, 0x20001a40, 0x20001b40);
    if (res != -1)
      r[1] = *(uint32_t*)0x20001a74;
    break;
  case 4:
    *(uint64_t*)0x20001cc0 = 0x20001a00;
    *(uint16_t*)0x20001a00 = 0x10;
    *(uint16_t*)0x20001a02 = 0;
    *(uint32_t*)0x20001a04 = 0;
    *(uint32_t*)0x20001a08 = 0x90000;
    *(uint32_t*)0x20001cc8 = 0xc;
    *(uint64_t*)0x20001cd0 = 0x20001c80;
    *(uint64_t*)0x20001c80 = 0x20001b80;
    *(uint32_t*)0x20001b80 = 0xf8;
    *(uint16_t*)0x20001b84 = 0x24;
    *(uint16_t*)0x20001b86 = 4;
    *(uint32_t*)0x20001b88 = 0x70bd26;
    *(uint32_t*)0x20001b8c = 0x25dfdbff;
    *(uint32_t*)0x20001b90 = 3;
    *(uint16_t*)0x20001b94 = 0xe4;
    *(uint16_t*)0x20001b96 = 6;
    *(uint8_t*)0x20001b98 = 0;
    *(uint8_t*)0x20001b99 = 0;
    *(uint8_t*)0x20001b9a = 0;
    *(uint8_t*)0x20001b9b = 0;
    *(uint8_t*)0x20001b9c = 0;
    *(uint8_t*)0x20001b9d = 0;
    *(uint8_t*)0x20001b9e = 0;
    *(uint8_t*)0x20001b9f = 0;
    *(uint8_t*)0x20001ba0 = 0;
    *(uint8_t*)0x20001ba1 = 0;
    *(uint8_t*)0x20001ba2 = -1;
    *(uint8_t*)0x20001ba3 = -1;
    *(uint32_t*)0x20001ba4 = htobe32(-1);
    *(uint8_t*)0x20001ba8 = 0;
    *(uint8_t*)0x20001ba9 = 0;
    *(uint8_t*)0x20001baa = 0;
    *(uint8_t*)0x20001bab = 0;
    *(uint8_t*)0x20001bac = 0;
    *(uint8_t*)0x20001bad = 0;
    *(uint8_t*)0x20001bae = 0;
    *(uint8_t*)0x20001baf = 0;
    *(uint8_t*)0x20001bb0 = 0;
    *(uint8_t*)0x20001bb1 = 0;
    *(uint8_t*)0x20001bb2 = 0;
    *(uint8_t*)0x20001bb3 = 0;
    *(uint8_t*)0x20001bb4 = 0;
    *(uint8_t*)0x20001bb5 = 0;
    *(uint8_t*)0x20001bb6 = 0;
    *(uint8_t*)0x20001bb7 = 0;
    *(uint16_t*)0x20001bb8 = htobe16(0x4e20);
    *(uint16_t*)0x20001bba = htobe16(0);
    *(uint16_t*)0x20001bbc = htobe16(0x4e20);
    *(uint16_t*)0x20001bbe = htobe16(0);
    *(uint16_t*)0x20001bc0 = 0xa;
    *(uint8_t*)0x20001bc2 = 0x20;
    *(uint8_t*)0x20001bc3 = 0x80;
    *(uint8_t*)0x20001bc4 = 6;
    *(uint32_t*)0x20001bc8 = 0;
    *(uint32_t*)0x20001bcc = r[1];
    *(uint8_t*)0x20001bd0 = 0xac;
    *(uint8_t*)0x20001bd1 = 0x14;
    *(uint8_t*)0x20001bd2 = 0x14;
    *(uint8_t*)0x20001bd3 = 0xaa;
    *(uint32_t*)0x20001be0 = htobe32(0x4d2);
    *(uint8_t*)0x20001be4 = -1;
    *(uint8_t*)0x20001be8 = 0xac;
    *(uint8_t*)0x20001be9 = 0x14;
    *(uint8_t*)0x20001bea = 0x14;
    *(uint8_t*)0x20001beb = 0xbb;
    *(uint64_t*)0x20001bf8 = 2;
    *(uint64_t*)0x20001c00 = 2;
    *(uint64_t*)0x20001c08 = 0x3ff;
    *(uint64_t*)0x20001c10 = 0x69;
    *(uint64_t*)0x20001c18 = 0x42;
    *(uint64_t*)0x20001c20 = 6;
    *(uint64_t*)0x20001c28 = 0xfffffffffffffbff;
    *(uint64_t*)0x20001c30 = 3;
    *(uint64_t*)0x20001c38 = 6;
    *(uint64_t*)0x20001c40 = 5;
    *(uint64_t*)0x20001c48 = 1;
    *(uint64_t*)0x20001c50 = 4;
    *(uint32_t*)0x20001c58 = 0xfff;
    *(uint32_t*)0x20001c5c = 0x804;
    *(uint32_t*)0x20001c60 = 0x2c;
    *(uint32_t*)0x20001c64 = 0x70bd2c;
    *(uint32_t*)0x20001c68 = 0x3505;
    *(uint16_t*)0x20001c6c = 0xa;
    *(uint8_t*)0x20001c6e = 4;
    *(uint8_t*)0x20001c6f = 1;
    *(uint8_t*)0x20001c70 = 0;
    *(uint64_t*)0x20001c88 = 0xf8;
    *(uint64_t*)0x20001cd8 = 1;
    *(uint64_t*)0x20001ce0 = 0;
    *(uint64_t*)0x20001ce8 = 0;
    *(uint32_t*)0x20001cf0 = 0x24004040;
    syscall(__NR_sendmsg, r[0], 0x20001cc0, 0x80);
    break;
  case 5:
    *(uint64_t*)0x20000240 = 0x200017c0;
    *(uint64_t*)0x20000248 = 0;
    *(uint64_t*)0x20000250 = 0x20001880;
    *(uint64_t*)0x20000258 = 0;
    *(uint64_t*)0x20000260 = 0x20000140;
    *(uint64_t*)0x20000268 = 0;
    *(uint64_t*)0x20000270 = 0x200002c0;
    *(uint64_t*)0x20000278 = 0;
    syscall(__NR_pwritev, r[0], 0x20000240, 4, 0);
    break;
  case 6:
    memcpy((void*)0x20797ff7, "/dev/sg#", 9);
    res = syz_open_dev(0x20797ff7, 0, 0);
    if (res != -1)
      r[2] = res;
    break;
  case 7:
    *(uint32_t*)0x200000c0 = 0;
    *(uint32_t*)0x200000c4 = 0;
    *(uint32_t*)0x20000100 = 8;
    syscall(__NR_getsockopt, r[2], 0x84, 0x7b, 0x200000c0, 0x20000100);
    break;
  case 8:
    *(uint32_t*)0x20000200 = 0x10;
    syscall(__NR_getsockname, -1, 0x200001c0, 0x20000200);
    break;
  case 9:
    syscall(__NR_ioctl, r[2], 0x20000000002285, 0x20000000);
    break;
  case 10:
    syscall(__NR_read, r[2], 0x20001940, 0x8f);
    break;
  }
}

void execute_one()
{
  execute(11);
  collide = 1;
  execute(11);
}

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;
}