// https://syzkaller.appspot.com/bug?id=f9b01630f485f7543062ce8c950599021f8b84d1
// autogenerated by syzkaller (https://github.com/google/syzkaller)

#define _GNU_SOURCE

#include <endian.h>
#include <signal.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/ioctl.h>
#include <sys/mount.h>
#include <sys/syscall.h>
#include <sys/types.h>
#include <unistd.h>

#include <linux/fs.h>
#include <linux/types.h>

#define SIZEOF_IO_URING_SQE 64
#define SIZEOF_IO_URING_CQE 16

#define IORING_SETUP_SQE128 (1U << 10)
#define IORING_SETUP_CQE32 (1U << 11)

struct io_sqring_offsets {
  uint32_t head;
  uint32_t tail;
  uint32_t ring_mask;
  uint32_t ring_entries;
  uint32_t flags;
  uint32_t dropped;
  uint32_t array;
  uint32_t resv1;
  uint64_t user_addr;
};

struct io_cqring_offsets {
  uint32_t head;
  uint32_t tail;
  uint32_t ring_mask;
  uint32_t ring_entries;
  uint32_t overflow;
  uint32_t cqes;
  uint32_t flags;
  uint32_t resv1;
  uint64_t user_addr;
};

struct io_uring_params {
  uint32_t sq_entries;
  uint32_t cq_entries;
  uint32_t flags;
  uint32_t sq_thread_cpu;
  uint32_t sq_thread_idle;
  uint32_t features;
  uint32_t resv[4];
  struct io_sqring_offsets sq_off;
  struct io_cqring_offsets cq_off;
};

static long io_uring_sqe_size(struct io_uring_params* params)
{
  return SIZEOF_IO_URING_SQE << !!(params->flags & IORING_SETUP_SQE128);
}

static long syz_io_uring_submit(volatile long a0, volatile long a1,
                                volatile long a2, volatile long a3)
{
  struct io_uring_params* params = (struct io_uring_params*)a0;
  char* ring_ptr = (char*)a1;
  char* sqes_ptr = (char*)a2;
  char* sqe = (char*)a3;
  uint32_t sq_ring_mask = *(uint32_t*)(ring_ptr + params->sq_off.ring_mask);
  uint32_t* sq_tail_ptr = (uint32_t*)(ring_ptr + params->sq_off.tail);
  uint32_t sq_tail = *sq_tail_ptr & sq_ring_mask;
  uint32_t sqe_size = io_uring_sqe_size(params);
  char* sqe_dest = sqes_ptr + sq_tail * sqe_size;
  memcpy(sqe_dest, sqe, sqe_size);
  uint32_t sq_tail_next = *sq_tail_ptr + 1;
  __atomic_store_n(sq_tail_ptr, sq_tail_next, __ATOMIC_RELEASE);
  return 0;
}

#define UBLK_F_USER_COPY (1UL << 7)

#define UBLK_IO_RES_OK 0
#define UBLK_IO_RES_NEED_GET_DATA 1

#define UBLK_IO_COMMIT_AND_FETCH_REQ 0x21
#define UBLK_IO_NEED_GET_DATA 0x22

#define UBLK_U_IO_COMMIT_AND_FETCH_REQ                                         \
  _IOWR('u', UBLK_IO_COMMIT_AND_FETCH_REQ, struct ublksrv_io_cmd)
#define UBLK_U_IO_NEED_GET_DATA                                                \
  _IOWR('u', UBLK_IO_NEED_GET_DATA, struct ublksrv_io_cmd)

struct ublksrv_ctrl_cmd {
  __u32 dev_id;
  __u16 queue_id;
  __u16 len;
  __u64 addr;
  __u64 data[1];
  __u16 dev_path_len;
  __u16 pad;
  __u32 reserved;
};

struct ublksrv_ctrl_dev_info {
  __u16 nr_hw_queues;
  __u16 queue_depth;
  __u16 state;
  __u16 pad0;
  __u32 max_io_buf_bytes;
  __u32 dev_id;
  __s32 ublksrv_pid;
  __u32 pad1;
  __u64 flags;
  __u64 ublksrv_flags;
  __u32 owner_uid;
  __u32 owner_gid;
  __u64 reserved1;
  __u64 reserved2;
};

struct ublksrv_io_desc {
  __u32 op_flags;
  union {
    __u32 nr_sectors;
    __u32 nr_zones;
  };
  __u64 start_sector;
  __u64 addr;
};

struct ublksrv_io_cmd {
  __u16 q_id;
  __u16 tag;
  __s32 result;
  union {
    __u64 addr;
    __u64 zone_append_lba;
  };
};

struct io_uring_sqe {
  __u8 opcode;
  __u8 flags;
  __u16 ioprio;
  __s32 fd;
  union {
    __u64 off;
    __u64 addr2;
    struct {
      __u32 cmd_op;
      __u32 __pad1;
    };
  };
  union {
    __u64 addr;
    __u64 splice_off_in;
    struct {
      __u32 level;
      __u32 optname;
    };
  };
  __u32 len;
  union {
    __kernel_rwf_t rw_flags;
    __u32 fsync_flags;
    __u16 poll_events;
    __u32 poll32_events;
    __u32 sync_range_flags;
    __u32 msg_flags;
    __u32 timeout_flags;
    __u32 accept_flags;
    __u32 cancel_flags;
    __u32 open_flags;
    __u32 statx_flags;
    __u32 fadvise_advice;
    __u32 splice_flags;
    __u32 rename_flags;
    __u32 unlink_flags;
    __u32 hardlink_flags;
    __u32 xattr_flags;
    __u32 msg_ring_flags;
    __u32 uring_cmd_flags;
    __u32 waitid_flags;
    __u32 futex_flags;
    __u32 install_fd_flags;
    __u32 nop_flags;
    __u32 pipe_flags;
  };
  __u64 user_data;
  union {
    __u16 buf_index;
    __u16 buf_group;
  } __attribute__((packed));
  __u16 personality;
  union {
    __s32 splice_fd_in;
    __u32 file_index;
    __u32 zcrx_ifq_idx;
    __u32 optlen;
    struct {
      __u16 addr_len;
      __u16 __pad3[1];
    };
  };
  union {
    struct {
      __u64 addr3;
      __u64 __pad2[1];
    };
    struct {
      __u64 attr_ptr;
      __u64 attr_type_mask;
    };
    __u64 optval;
    __u8 cmd[0];
  };
};

static long syz_ublk_add_dev(volatile long a0, volatile long a1,
                             volatile long a2, volatile long a3,
                             volatile long a4, volatile long a5)
{
  __u32 ring_fd = (__u32)a0;
  struct io_uring_params* params = (struct io_uring_params*)a1;
  char* ring_ptr = (char*)a2;
  char* sqes_ptr = (char*)a3;
  struct io_uring_sqe* sqe = (struct io_uring_sqe*)a4;
  void** dev_info_ptr_out = (void**)a5;
  struct ublksrv_ctrl_cmd* cmd = (struct ublksrv_ctrl_cmd*)(sqe->cmd);
  struct ublksrv_ctrl_dev_info* dev_info =
      (struct ublksrv_ctrl_dev_info*)(unsigned long)(cmd->addr);
  dev_info->flags |= UBLK_F_USER_COPY;
  int ret = syz_io_uring_submit((long)params, (long)ring_ptr, (long)sqes_ptr,
                                (long)sqe);
  if (ret < 0)
    return (long)ret;
  syscall(__NR_io_uring_enter, ring_fd, 1, 1, 1, NULL, _NSIG / 8);
  *dev_info_ptr_out = (void*)dev_info;
  return dev_info->dev_id;
}

uint64_t r[3] = {0xffffffffffffffff, 0xffffffffffffffff, 0xffffffffffffffff};

int main(void)
{
  syscall(__NR_mmap, /*addr=*/0x1ffffffff000ul, /*len=*/0x1000, /*prot=*/0ul,
          /*flags=MAP_FIXED|MAP_ANONYMOUS|MAP_PRIVATE*/ 0x32ul,
          /*fd=*/(intptr_t)-1, /*offset=*/0ul);
  syscall(__NR_mmap, /*addr=*/0x200000000000ul, /*len=*/0x1000000,
          /*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=*/0x200001000000ul, /*len=*/0x1000, /*prot=*/0ul,
          /*flags=MAP_FIXED|MAP_ANONYMOUS|MAP_PRIVATE*/ 0x32ul,
          /*fd=*/(intptr_t)-1, /*offset=*/0ul);
  const char* reason;
  (void)reason;
  intptr_t res = 0;
  if (write(1, "executing program\n", sizeof("executing program\n") - 1)) {
  }
  //  sendmsg$inet arguments: [
  //    fd: sock (resource)
  //    msg: ptr[in, msghdr_inet] {
  //      msghdr_inet {
  //        msg_name: nil
  //        msg_namelen: len = 0x0 (4 bytes)
  //        pad = 0x0 (4 bytes)
  //        msg_iov: nil
  //        msg_iovlen: len = 0x0 (8 bytes)
  //        msg_control: ptr[inout, array[ANYUNION]] {
  //          array[ANYUNION] {
  //            union ANYUNION {
  //              ANYBLOB: buffer: {28 01 00 00 00 00 00 00 01 00 00 00 01}
  //              (length 0xd)
  //            }
  //          }
  //        }
  //        msg_controllen: bytesize = 0x128 (8 bytes)
  //        msg_flags: const = 0x0 (4 bytes)
  //        pad = 0x0 (4 bytes)
  //      }
  //    }
  //    f: send_flags = 0x4004000 (8 bytes)
  //  ]
  *(uint64_t*)0x200000001b00 = 0;
  *(uint32_t*)0x200000001b08 = 0;
  *(uint64_t*)0x200000001b10 = 0;
  *(uint64_t*)0x200000001b18 = 0;
  *(uint64_t*)0x200000001b20 = 0x200000001d80;
  memcpy((void*)0x200000001d80,
         "\x28\x01\x00\x00\x00\x00\x00\x00\x01\x00\x00\x00\x01", 13);
  *(uint64_t*)0x200000001b28 = 0x128;
  *(uint32_t*)0x200000001b30 = 0;
  syscall(__NR_sendmsg, /*fd=*/(intptr_t)-1, /*msg=*/0x200000001b00ul,
          /*f=MSG_ZEROCOPY|MSG_NOSIGNAL*/ 0x4004000ul);
  //  socket$inet_tcp arguments: [
  //    domain: const = 0x2 (8 bytes)
  //    type: const = 0x1 (8 bytes)
  //    proto: const = 0x0 (4 bytes)
  //  ]
  //  returns sock_tcp
  syscall(__NR_socket, /*domain=*/2ul, /*type=*/1ul, /*proto=*/0);
  //  socketpair$unix arguments: [
  //    domain: const = 0x1 (8 bytes)
  //    type: unix_socket_type = 0x2 (8 bytes)
  //    proto: const = 0x0 (4 bytes)
  //    fds: ptr[out, unix_pair] {
  //      unix_pair {
  //        fd0: sock_unix (resource)
  //        fd1: sock_unix (resource)
  //      }
  //    }
  //  ]
  res = syscall(__NR_socketpair, /*domain=*/1ul, /*type=SOCK_DGRAM*/ 2ul,
                /*proto=*/0, /*fds=*/0x200000000100ul);
  if (res != -1) {
    r[0] = *(uint32_t*)0x200000000100;
    r[1] = *(uint32_t*)0x200000000104;
  }
  //  sendmsg$inet arguments: [
  //    fd: sock (resource)
  //    msg: ptr[in, msghdr_inet] {
  //      msghdr_inet {
  //        msg_name: nil
  //        msg_namelen: len = 0x0 (4 bytes)
  //        pad = 0x0 (4 bytes)
  //        msg_iov: nil
  //        msg_iovlen: len = 0x0 (8 bytes)
  //        msg_control: ptr[inout, array[ANYUNION]] {
  //          array[ANYUNION] {
  //          }
  //        }
  //        msg_controllen: bytesize = 0x128 (8 bytes)
  //        msg_flags: const = 0x0 (4 bytes)
  //        pad = 0x0 (4 bytes)
  //      }
  //    }
  //    f: send_flags = 0x0 (8 bytes)
  //  ]
  *(uint64_t*)0x200000001b00 = 0;
  *(uint32_t*)0x200000001b08 = 0;
  *(uint64_t*)0x200000001b10 = 0;
  *(uint64_t*)0x200000001b18 = 0;
  *(uint64_t*)0x200000001b20 = 0x200000001d80;
  *(uint64_t*)0x200000001b28 = 0x128;
  *(uint32_t*)0x200000001b30 = 0;
  syscall(__NR_sendmsg, /*fd=*/r[1], /*msg=*/0x200000001b00ul, /*f=*/0ul);
  //  socket$inet_tcp arguments: [
  //    domain: const = 0x2 (8 bytes)
  //    type: const = 0x1 (8 bytes)
  //    proto: const = 0x0 (4 bytes)
  //  ]
  //  returns sock_tcp
  syscall(__NR_socket, /*domain=*/2ul, /*type=*/1ul, /*proto=*/0);
  //  socket$inet6_tcp arguments: [
  //    domain: const = 0xa (8 bytes)
  //    type: const = 0x1 (8 bytes)
  //    proto: const = 0x0 (4 bytes)
  //  ]
  //  returns sock_tcp6
  syscall(__NR_socket, /*domain=*/0xaul, /*type=*/1ul, /*proto=*/0);
  //  recvmsg$unix arguments: [
  //    fd: sock_unix (resource)
  //    msg: ptr[inout, recv_msghdr_un] {
  //      recv_msghdr_un {
  //        addr: nil
  //        addrlen: len = 0x0 (4 bytes)
  //        pad = 0x0 (4 bytes)
  //        vec: nil
  //        vlen: len = 0x0 (8 bytes)
  //        ctrl: ptr[out, array[cmsghdr_un]] {
  //          array[cmsghdr_un] {
  //            union cmsghdr_un {
  //              cred: cmsghdr_t[SOL_SOCKET, SCM_CREDENTIALS, cmsg_un_cred] {
  //                unaligned: cmsghdr_unaligned[SOL_SOCKET, SCM_CREDENTIALS,
  //                cmsg_un_cred] {
  //                  cmsg_len: len = 0x1c (8 bytes)
  //                  cmsg_level: const = 0x1 (4 bytes)
  //                  cmsg_type: const = 0x2 (4 bytes)
  //                  data: cmsg_un_cred {
  //                    pid: pid (resource)
  //                    uid: uid (resource)
  //                    gid: gid (resource)
  //                  }
  //                }
  //                pad = 0x0 (4 bytes)
  //              }
  //            }
  //            union cmsghdr_un {
  //              rights: cmsghdr_t[SOL_SOCKET, SCM_RIGHTS, array[fd]] {
  //                unaligned: cmsghdr_unaligned[SOL_SOCKET, SCM_RIGHTS,
  //                array[fd]] {
  //                  cmsg_len: len = 0x10 (8 bytes)
  //                  cmsg_level: const = 0x1 (4 bytes)
  //                  cmsg_type: const = 0x1 (4 bytes)
  //                  data: array[fd] {
  //                  }
  //                }
  //              }
  //            }
  //            union cmsghdr_un {
  //              rights: cmsghdr_t[SOL_SOCKET, SCM_RIGHTS, array[fd]] {
  //                unaligned: cmsghdr_unaligned[SOL_SOCKET, SCM_RIGHTS,
  //                array[fd]] {
  //                  cmsg_len: len = 0x1c (8 bytes)
  //                  cmsg_level: const = 0x1 (4 bytes)
  //                  cmsg_type: const = 0x1 (4 bytes)
  //                  data: array[fd] {
  //                    fd (resource)
  //                    fd (resource)
  //                    fd (resource)
  //                  }
  //                }
  //              }
  //            }
  //            union cmsghdr_un {
  //              rights: cmsghdr_t[SOL_SOCKET, SCM_RIGHTS, array[fd]] {
  //                unaligned: cmsghdr_unaligned[SOL_SOCKET, SCM_RIGHTS,
  //                array[fd]] {
  //                  cmsg_len: len = 0x10 (8 bytes)
  //                  cmsg_level: const = 0x1 (4 bytes)
  //                  cmsg_type: const = 0x1 (4 bytes)
  //                  data: array[fd] {
  //                  }
  //                }
  //              }
  //            }
  //            union cmsghdr_un {
  //              rights: cmsghdr_t[SOL_SOCKET, SCM_RIGHTS, array[fd]] {
  //                unaligned: cmsghdr_unaligned[SOL_SOCKET, SCM_RIGHTS,
  //                array[fd]] {
  //                  cmsg_len: len = 0x10 (8 bytes)
  //                  cmsg_level: const = 0x1 (4 bytes)
  //                  cmsg_type: const = 0x1 (4 bytes)
  //                  data: array[fd] {
  //                  }
  //                }
  //              }
  //            }
  //            union cmsghdr_un {
  //              cred: cmsghdr_t[SOL_SOCKET, SCM_CREDENTIALS, cmsg_un_cred] {
  //                unaligned: cmsghdr_unaligned[SOL_SOCKET, SCM_CREDENTIALS,
  //                cmsg_un_cred] {
  //                  cmsg_len: len = 0x1c (8 bytes)
  //                  cmsg_level: const = 0x1 (4 bytes)
  //                  cmsg_type: const = 0x2 (4 bytes)
  //                  data: cmsg_un_cred {
  //                    pid: pid (resource)
  //                    uid: uid (resource)
  //                    gid: gid (resource)
  //                  }
  //                }
  //                pad = 0x0 (4 bytes)
  //              }
  //            }
  //            union cmsghdr_un {
  //              rights: cmsghdr_t[SOL_SOCKET, SCM_RIGHTS, array[fd]] {
  //                unaligned: cmsghdr_unaligned[SOL_SOCKET, SCM_RIGHTS,
  //                array[fd]] {
  //                  cmsg_len: len = 0x14 (8 bytes)
  //                  cmsg_level: const = 0x1 (4 bytes)
  //                  cmsg_type: const = 0x1 (4 bytes)
  //                  data: array[fd] {
  //                    fd (resource)
  //                  }
  //                }
  //              }
  //            }
  //          }
  //        }
  //        ctrllen: bytesize = 0xa8 (8 bytes)
  //        f: const = 0x0 (4 bytes)
  //        pad = 0x0 (4 bytes)
  //      }
  //    }
  //    f: recv_flags = 0x80 (8 bytes)
  //  ]
  *(uint64_t*)0x200000000000 = 0;
  *(uint32_t*)0x200000000008 = 0;
  *(uint64_t*)0x200000000010 = 0;
  *(uint64_t*)0x200000000018 = 0;
  *(uint64_t*)0x200000000020 = 0x200000000340;
  *(uint64_t*)0x200000000028 = 0xa8;
  *(uint32_t*)0x200000000030 = 0;
  syscall(__NR_recvmsg, /*fd=*/r[0], /*msg=*/0x200000000000ul, /*f=*/0x80ul, 0);
  //  mmap$IORING_OFF_SQ_RING arguments: [
  //    addr: const = 0x0 (8 bytes)
  //    len: int32 = 0xc00000 (4 bytes)
  //    prot: mmap_prot = 0x2000007 (8 bytes)
  //    flags: mmap_flags = 0x401d031 (8 bytes)
  //    fd: fd_io_uring (resource)
  //    offset: const = 0x0 (8 bytes)
  //  ]
  //  returns ring_ptr
  syscall(
      __NR_mmap, /*addr=*/0ul, /*len=*/0xc00000,
      /*prot=PROT_GROWSUP|PROT_WRITE|PROT_READ|PROT_EXEC*/ 0x2000007ul,
      /*flags=MAP_UNINITIALIZED|MAP_POPULATE|MAP_NORESERVE|MAP_NONBLOCK|MAP_FIXED|0x1021*/
      0x401d031ul, /*fd=*/(intptr_t)-1, /*offset=*/0ul);
  //  socketpair$unix arguments: [
  //    domain: const = 0x1 (8 bytes)
  //    type: unix_socket_type = 0x0 (8 bytes)
  //    proto: const = 0x0 (4 bytes)
  //    fds: nil
  //  ]
  syscall(__NR_socketpair, /*domain=*/1ul, /*type=*/0ul, /*proto=*/0,
          /*fds=*/0ul);
  //  syz_ublk_add_dev arguments: [
  //    fd_io_uring: fd_io_uring (resource)
  //    ring_params_ptr: ring_params_ptr (resource)
  //    ring_ptr: ring_ptr (resource)
  //    sqes_ptr: sqes_ptr (resource)
  //    sqe: nil
  //    dev_info_ptr: ptr[out, dev_info_ptr] {
  //      dev_info_ptr (resource)
  //    }
  //  ]
  //  returns ublk_dev_id
  syz_ublk_add_dev(/*fd_io_uring=*/-1, /*ring_params_ptr=*/0, /*ring_ptr=*/0,
                   /*sqes_ptr=*/0, /*sqe=*/0, /*dev_info_ptr=*/0x200000000300);
  //  mkdirat arguments: [
  //    fd: fd_dir (resource)
  //    path: ptr[in, buffer] {
  //      buffer: {2e 2f 64 65 62 75 67 00} (length 0x8)
  //    }
  //    mode: open_mode = 0x1ff (8 bytes)
  //  ]
  memcpy((void*)0x200000000000, "./debug\000", 8);
  syscall(
      __NR_mkdirat, /*fd=*/0xffffff9c, /*path=*/0x200000000000ul,
      /*mode=S_IXOTH|S_IWOTH|S_IROTH|S_IXGRP|S_IWGRP|S_IRGRP|S_IXUSR|S_IWUSR|0x100*/
      0x1fful);
  //  mount arguments: [
  //    src: nil
  //    dst: ptr[in, buffer] {
  //      buffer: {2e 2f 64 65 62 75 67 00} (length 0x8)
  //    }
  //    type: ptr[in, buffer] {
  //      buffer: {64 65 62 75 67 66 73 00} (length 0x8)
  //    }
  //    flags: mount_flags = 0x0 (8 bytes)
  //    data: nil
  //  ]
  memcpy((void*)0x200000000200, "./debug\000", 8);
  memcpy((void*)0x200000000300, "debugfs\000", 8);
  syscall(__NR_mount, /*src=*/0ul, /*dst=*/0x200000000200ul,
          /*type=*/0x200000000300ul, /*flags=*/0ul, /*data=*/0ul);
  //  openat arguments: [
  //    fd: fd_dir (resource)
  //    file: ptr[in, buffer] {
  //      buffer: {2e 2f 64 65 62 75 67 2f 73 70 6c 69 74 5f 68 75 67 65 5f 70
  //      61 67 65 73 00} (length 0x19)
  //    }
  //    flags: open_flags = 0x1 (4 bytes)
  //    mode: open_mode = 0x0 (2 bytes)
  //  ]
  //  returns fd
  memcpy((void*)0x200000000400, "./debug/split_huge_pages\000", 25);
  res = syscall(__NR_openat, /*fd=*/0xffffff9c, /*file=*/0x200000000400ul,
                /*flags=O_WRONLY*/ 1, /*mode=*/0);
  if (res != -1)
    r[2] = res;
  //  write arguments: [
  //    fd: fd (resource)
  //    buf: nil
  //    count: len = 0x2f (8 bytes)
  //  ]
  syscall(__NR_write, /*fd=*/r[2], /*buf=*/0ul, /*count=*/0x2ful);
  return 0;
}