// https://syzkaller.appspot.com/bug?id=54982c35eb2e9ab56deba591c75b9f41dfcaa291
// autogenerated by syzkaller (https://github.com/google/syzkaller)

#define _GNU_SOURCE

#include <dirent.h>
#include <endian.h>
#include <errno.h>
#include <fcntl.h>
#include <signal.h>
#include <stdarg.h>
#include <stdbool.h>
#include <stddef.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/ioctl.h>
#include <sys/mman.h>
#include <sys/mount.h>
#include <sys/prctl.h>
#include <sys/stat.h>
#include <sys/syscall.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <time.h>
#include <unistd.h>

#include <linux/kvm.h>

#ifndef __NR_ioctl
#define __NR_ioctl 29
#endif
#ifndef __NR_mmap
#define __NR_mmap 222
#endif
#ifndef __NR_openat
#define __NR_openat 56
#endif

static void sleep_ms(uint64_t ms)
{
  usleep(ms * 1000);
}

static uint64_t current_time_ms(void)
{
  struct timespec ts;
  if (clock_gettime(CLOCK_MONOTONIC, &ts))
    exit(1);
  return (uint64_t)ts.tv_sec * 1000 + (uint64_t)ts.tv_nsec / 1000000;
}

static void use_temporary_dir(void)
{
  char tmpdir_template[] = "./syzkaller.XXXXXX";
  char* tmpdir = mkdtemp(tmpdir_template);
  if (!tmpdir)
    exit(1);
  if (chmod(tmpdir, 0777))
    exit(1);
  if (chdir(tmpdir))
    exit(1);
}

static bool write_file(const char* file, const char* what, ...)
{
  char buf[1024];
  va_list args;
  va_start(args, what);
  vsnprintf(buf, sizeof(buf), what, args);
  va_end(args);
  buf[sizeof(buf) - 1] = 0;
  int len = strlen(buf);
  int fd = open(file, O_WRONLY | O_CLOEXEC);
  if (fd == -1)
    return false;
  if (write(fd, buf, len) != len) {
    int err = errno;
    close(fd);
    errno = err;
    return false;
  }
  close(fd);
  return true;
}

#define noinline __attribute__((noinline))
#define always_inline __attribute__((always_inline)) inline
#define __no_stack_protector
#define __addrspace_guest
#define __optnone
#define GUEST_CODE                                                             \
  __attribute__((section("guest"))) __no_stack_protector __addrspace_guest
extern char *__start_guest, *__stop_guest;

#define KVM_MAX_VCPU 4
#define KVM_MAX_L2_VMS 4
#define KVM_PAGE_SIZE (1 << 12)
#define KVM_GUEST_PAGES 1024
#define KVM_GUEST_MEM_SIZE (KVM_GUEST_PAGES * KVM_PAGE_SIZE)
#define SZ_4K 0x00001000
#define SZ_64K 0x00010000
#define GENMASK_ULL(h, l)                                                      \
  (((~0ULL) - (1ULL << (l)) + 1ULL) & (~0ULL >> (63 - (h))))
#define ARM64_ADDR_GICD_BASE 0x08000000
#define ARM64_ADDR_GITS_BASE 0x08080000
#define ARM64_ADDR_GICR_BASE 0x080a0000
#define ARM64_ADDR_ITS_TABLES 0xc0000000
#define ARM64_ADDR_EXIT 0xdddd0000
#define ARM64_ADDR_UEXIT (ARM64_ADDR_EXIT + 256)
#define ARM64_ADDR_DIRTY_PAGES 0xdddd1000
#define ARM64_ADDR_USER_CODE 0xeeee0000
#define SYZOS_ADDR_EXECUTOR_CODE 0xeeee8000
#define ARM64_ADDR_SCRATCH_CODE 0xeeef0000
#define ARM64_ADDR_EL1_STACK_BOTTOM 0xffff1000
#define ITS_MAX_DEVICES 16
#define ARM64_ADDR_ITS_DEVICE_TABLE (ARM64_ADDR_ITS_TABLES)
#define ARM64_ADDR_ITS_COLL_TABLE (ARM64_ADDR_ITS_DEVICE_TABLE + SZ_64K)
#define ARM64_ADDR_ITS_CMDQ_BASE (ARM64_ADDR_ITS_COLL_TABLE + SZ_64K)
#define ARM64_ADDR_ITS_ITT_TABLES (ARM64_ADDR_ITS_CMDQ_BASE + SZ_64K)
#define ARM64_ADDR_ITS_PROP_TABLE                                              \
  (ARM64_ADDR_ITS_ITT_TABLES + SZ_64K * ITS_MAX_DEVICES)
#define ARM64_ADDR_ITS_PEND_TABLES (ARM64_ADDR_ITS_PROP_TABLE + SZ_64K)

static int kvm_set_device_attr(int dev_fd, uint32_t group, uint64_t attr,
                               void* val)
{
  struct kvm_device_attr kvmattr = {
      .flags = 0,
      .group = group,
      .attr = attr,
      .addr = (uintptr_t)val,
  };
  return ioctl(dev_fd, KVM_SET_DEVICE_ATTR, &kvmattr);
}

static int kvm_create_device(int vm_fd, int type)
{
  struct kvm_create_device create_dev = {
      .type = (uint32_t)type,
      .fd = (uint32_t)-1,
      .flags = 0,
  };
  if (ioctl(vm_fd, KVM_CREATE_DEVICE, &create_dev) != -1)
    return create_dev.fd;
  else
    return -1;
}

#define REDIST_REGION_ATTR_ADDR(count, base, flags, index)                     \
  (((uint64_t)(count) << 52) | ((uint64_t)((base) >> 16) << 16) |              \
   ((uint64_t)(flags) << 12) | index)
static long syz_kvm_vgic_v3_setup(volatile long a0, volatile long a1,
                                  volatile long a2)
{
  const int vm_fd = a0;
  const int nr_vcpus = a1;
  const int want_nr_irq = a2;
  int vgic_fd = kvm_create_device(vm_fd, KVM_DEV_TYPE_ARM_VGIC_V3);
  if (vgic_fd == -1)
    return -1;
  uint32_t nr_irq = want_nr_irq;
  int ret =
      kvm_set_device_attr(vgic_fd, KVM_DEV_ARM_VGIC_GRP_NR_IRQS, 0, &nr_irq);
  if (ret == -1) {
    close(vgic_fd);
    return -1;
  }
  uint64_t gicd_base_gpa = ARM64_ADDR_GICD_BASE;
  ret = kvm_set_device_attr(vgic_fd, KVM_DEV_ARM_VGIC_GRP_ADDR,
                            KVM_VGIC_V3_ADDR_TYPE_DIST, &gicd_base_gpa);
  if (ret == -1) {
    close(vgic_fd);
    return -1;
  }
  uint64_t redist_attr =
      REDIST_REGION_ATTR_ADDR(nr_vcpus, ARM64_ADDR_GICR_BASE, 0, 0);
  ret = kvm_set_device_attr(vgic_fd, KVM_DEV_ARM_VGIC_GRP_ADDR,
                            KVM_VGIC_V3_ADDR_TYPE_REDIST_REGION, &redist_attr);
  if (ret == -1) {
    close(vgic_fd);
    return -1;
  }
  ret = kvm_set_device_attr(vgic_fd, KVM_DEV_ARM_VGIC_GRP_CTRL,
                            KVM_DEV_ARM_VGIC_CTRL_INIT, NULL);
  if (ret == -1) {
    close(vgic_fd);
    return -1;
  }
  return vgic_fd;
}

#define FS_IOC_SETFLAGS _IOW('f', 2, long)
static void remove_dir(const char* dir)
{
  int iter = 0;
  DIR* dp = 0;
  const int umount_flags = MNT_FORCE | UMOUNT_NOFOLLOW;

retry:
  while (umount2(dir, umount_flags) == 0) {
  }
  dp = opendir(dir);
  if (dp == NULL) {
    if (errno == EMFILE) {
      exit(1);
    }
    exit(1);
  }
  struct dirent* ep = 0;
  while ((ep = readdir(dp))) {
    if (strcmp(ep->d_name, ".") == 0 || strcmp(ep->d_name, "..") == 0)
      continue;
    char filename[FILENAME_MAX];
    snprintf(filename, sizeof(filename), "%s/%s", dir, ep->d_name);
    while (umount2(filename, umount_flags) == 0) {
    }
    struct stat st;
    if (lstat(filename, &st))
      exit(1);
    if (S_ISDIR(st.st_mode)) {
      remove_dir(filename);
      continue;
    }
    int i;
    for (i = 0;; i++) {
      if (unlink(filename) == 0)
        break;
      if (errno == EPERM) {
        int fd = open(filename, O_RDONLY);
        if (fd != -1) {
          long flags = 0;
          if (ioctl(fd, FS_IOC_SETFLAGS, &flags) == 0) {
          }
          close(fd);
          continue;
        }
      }
      if (errno == EROFS) {
        break;
      }
      if (errno != EBUSY || i > 100)
        exit(1);
      if (umount2(filename, umount_flags))
        exit(1);
    }
  }
  closedir(dp);
  for (int i = 0;; i++) {
    if (rmdir(dir) == 0)
      break;
    if (i < 100) {
      if (errno == EPERM) {
        int fd = open(dir, O_RDONLY);
        if (fd != -1) {
          long flags = 0;
          if (ioctl(fd, FS_IOC_SETFLAGS, &flags) == 0) {
          }
          close(fd);
          continue;
        }
      }
      if (errno == EROFS) {
        break;
      }
      if (errno == EBUSY) {
        if (umount2(dir, umount_flags))
          exit(1);
        continue;
      }
      if (errno == ENOTEMPTY) {
        if (iter < 100) {
          iter++;
          goto retry;
        }
      }
    }
    exit(1);
  }
}

static int inject_fault(int nth)
{
  int fd;
  fd = open("/proc/thread-self/fail-nth", O_RDWR);
  if (fd == -1)
    exit(1);
  char buf[16];
  sprintf(buf, "%d", nth);
  if (write(fd, buf, strlen(buf)) != (ssize_t)strlen(buf))
    exit(1);
  return fd;
}

static void kill_and_wait(int pid, int* status)
{
  kill(-pid, SIGKILL);
  kill(pid, SIGKILL);
  for (int i = 0; i < 100; i++) {
    if (waitpid(-1, status, WNOHANG | __WALL) == pid)
      return;
    usleep(1000);
  }
  DIR* dir = opendir("/sys/fs/fuse/connections");
  if (dir) {
    for (;;) {
      struct dirent* ent = readdir(dir);
      if (!ent)
        break;
      if (strcmp(ent->d_name, ".") == 0 || strcmp(ent->d_name, "..") == 0)
        continue;
      char abort[300];
      snprintf(abort, sizeof(abort), "/sys/fs/fuse/connections/%s/abort",
               ent->d_name);
      int fd = open(abort, O_WRONLY);
      if (fd == -1) {
        continue;
      }
      if (write(fd, abort, 1) < 0) {
      }
      close(fd);
    }
    closedir(dir);
  } else {
  }
  while (waitpid(-1, status, __WALL) != pid) {
  }
}

static void setup_test()
{
  prctl(PR_SET_PDEATHSIG, SIGKILL, 0, 0, 0);
  setpgrp();
  write_file("/proc/self/oom_score_adj", "1000");
  if (symlink("/dev/binderfs", "./binderfs")) {
  }
}

static const char* setup_fault()
{
  int fd = open("/proc/self/make-it-fail", O_WRONLY);
  if (fd == -1)
    return "CONFIG_FAULT_INJECTION is not enabled";
  close(fd);
  fd = open("/proc/thread-self/fail-nth", O_WRONLY);
  if (fd == -1)
    return "kernel does not have systematic fault injection support";
  close(fd);
  static struct {
    const char* file;
    const char* val;
    bool fatal;
  } files[] = {
      {"/sys/kernel/debug/failslab/ignore-gfp-wait", "N", true},
      {"/sys/kernel/debug/fail_futex/ignore-private", "N", false},
      {"/sys/kernel/debug/fail_page_alloc/ignore-gfp-highmem", "N", false},
      {"/sys/kernel/debug/fail_page_alloc/ignore-gfp-wait", "N", false},
      {"/sys/kernel/debug/fail_page_alloc/min-order", "0", false},
  };
  unsigned i;
  for (i = 0; i < sizeof(files) / sizeof(files[0]); i++) {
    if (!write_file(files[i].file, files[i].val)) {
      if (files[i].fatal)
        return "failed to write fault injection file";
    }
  }
  return NULL;
}

static void execute_one(void);

#define WAIT_FLAGS __WALL

static void loop(void)
{
  int iter = 0;
  for (;; iter++) {
    char cwdbuf[32];
    sprintf(cwdbuf, "./%d", iter);
    if (mkdir(cwdbuf, 0777))
      exit(1);
    int pid = fork();
    if (pid < 0)
      exit(1);
    if (pid == 0) {
      if (chdir(cwdbuf))
        exit(1);
      setup_test();
      execute_one();
      exit(0);
    }
    int status = 0;
    uint64_t start = current_time_ms();
    for (;;) {
      sleep_ms(10);
      if (waitpid(-1, &status, WNOHANG | WAIT_FLAGS) == pid)
        break;
      if (current_time_ms() - start < 15000)
        continue;
      kill_and_wait(pid, &status);
      break;
    }
    remove_dir(cwdbuf);
  }
}

uint64_t r[2] = {0xffffffffffffffff, 0xffffffffffffffff};

void execute_one(void)
{
  intptr_t res = 0;
  if (write(1, "executing program\n", sizeof("executing program\n") - 1)) {
  }
  //  openat$kvm arguments: [
  //    fd: const = 0x0 (8 bytes)
  //    file: ptr[in, buffer] {
  //      buffer: {2f 64 65 76 2f 6b 76 6d 00} (length 0x9)
  //    }
  //    flags: open_flags = 0x103080 (4 bytes)
  //    mode: const = 0x0 (2 bytes)
  //  ]
  //  returns fd_kvm
  memcpy((void*)0x20000280, "/dev/kvm\000", 9);
  res = syscall(__NR_openat, /*fd=*/0ul, /*file=*/0x20000280ul,
                /*flags=O_SYNC|O_EXCL|FASYNC*/ 0x103080, /*mode=*/0);
  if (res != -1)
    r[0] = res;
  //  ioctl$KVM_CREATE_VM arguments: [
  //    fd: fd_kvm (resource)
  //    cmd: const = 0xae01 (4 bytes)
  //    type: intptr = 0x0 (8 bytes)
  //  ]
  //  returns fd_kvmvm
  res = syscall(__NR_ioctl, /*fd=*/r[0], /*cmd=*/0xae01, /*type=*/0ul);
  if (res != -1)
    r[1] = res;
  //  ioctl$KVM_CREATE_VCPU arguments: [
  //    fd: fd_kvmvm (resource)
  //    cmd: const = 0xae41 (4 bytes)
  //    id: intptr = 0x2 (8 bytes)
  //  ]
  //  returns fd_kvmcpu
  syscall(__NR_ioctl, /*fd=*/r[1], /*cmd=*/0xae41, /*id=*/2ul);
  //  syz_kvm_vgic_v3_setup arguments: [
  //    fd: fd_kvmvm (resource)
  //    ncpus: intptr = 0x1 (8 bytes)
  //    nirqs: kvm_num_irqs = 0x40 (8 bytes)
  //  ]
  //  returns fd_kvmdev
  inject_fault(5);
  syz_kvm_vgic_v3_setup(/*fd=*/r[1], /*ncpus=*/1, /*nirqs=*/0x40);
}
int main(void)
{
  syscall(__NR_mmap, /*addr=*/0x1ffff000ul, /*len=*/0x1000ul, /*prot=*/0ul,
          /*flags=MAP_FIXED|MAP_ANONYMOUS|MAP_PRIVATE*/ 0x32ul,
          /*fd=*/(intptr_t)-1, /*offset=*/0ul);
  syscall(__NR_mmap, /*addr=*/0x20000000ul, /*len=*/0x1000000ul,
          /*prot=PROT_WRITE|PROT_READ|PROT_EXEC*/ 7ul,
          /*flags=MAP_FIXED|MAP_ANONYMOUS|MAP_PRIVATE*/ 0x32ul,
          /*fd=*/(intptr_t)-1, /*offset=*/0ul);
  syscall(__NR_mmap, /*addr=*/0x21000000ul, /*len=*/0x1000ul, /*prot=*/0ul,
          /*flags=MAP_FIXED|MAP_ANONYMOUS|MAP_PRIVATE*/ 0x32ul,
          /*fd=*/(intptr_t)-1, /*offset=*/0ul);
  const char* reason;
  (void)reason;
  if ((reason = setup_fault()))
    printf("the reproducer may not work as expected: fault injection setup "
           "failed: %s\n",
           reason);
  use_temporary_dir();
  loop();
  return 0;
}