// https://syzkaller.appspot.com/bug?id=f33cca98586021331cba23944d6d124937f6fa94
// autogenerated by syzkaller (https://github.com/google/syzkaller)

#define _GNU_SOURCE

#include <endian.h>
#include <fcntl.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/stat.h>
#include <sys/syscall.h>
#include <sys/types.h>
#include <unistd.h>

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

#ifndef __NR_fsconfig
#define __NR_fsconfig 431
#endif
#ifndef __NR_mkdir
#define __NR_mkdir 39
#endif
#ifndef __NR_mmap
#define __NR_mmap 192
#endif
#ifndef __NR_mount
#define __NR_mount 21
#endif
#ifndef __NR_openat
#define __NR_openat 295
#endif
#ifndef __NR_readv
#define __NR_readv 145
#endif
#undef __NR_mmap
#define __NR_mmap __NR_mmap2

#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;
}

static long syz_open_procfs(volatile long a0, volatile long a1)
{
  char buf[128];
  memset(buf, 0, sizeof(buf));
  if (a0 == 0) {
    snprintf(buf, sizeof(buf), "/proc/self/%s", (char*)a1);
  } else if (a0 == -1) {
    snprintf(buf, sizeof(buf), "/proc/thread-self/%s", (char*)a1);
  } else {
    snprintf(buf, sizeof(buf), "/proc/self/task/%d/%s", (int)a0, (char*)a1);
  }
  int fd = open(buf, O_RDWR);
  if (fd == -1)
    fd = open(buf, O_RDONLY);
  return fd;
}

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

int main(void)
{
  syscall(__NR_mmap, /*addr=*/0x7ffff000, /*len=*/0x1000, /*prot=*/0,
          /*flags=MAP_FIXED|MAP_ANONYMOUS|MAP_PRIVATE*/ 0x32,
          /*fd=*/(intptr_t)-1, /*offset=*/0);
  syscall(__NR_mmap, /*addr=*/0x80000000, /*len=*/0x1000000,
          /*prot=PROT_WRITE|PROT_READ|PROT_EXEC*/ 7,
          /*flags=MAP_FIXED|MAP_ANONYMOUS|MAP_PRIVATE*/ 0x32,
          /*fd=*/(intptr_t)-1, /*offset=*/0);
  syscall(__NR_mmap, /*addr=*/0x81000000, /*len=*/0x1000, /*prot=*/0,
          /*flags=MAP_FIXED|MAP_ANONYMOUS|MAP_PRIVATE*/ 0x32,
          /*fd=*/(intptr_t)-1, /*offset=*/0);
  const char* reason;
  (void)reason;
  intptr_t res = 0;
  if (write(1, "executing program\n", sizeof("executing program\n") - 1)) {
  }
  //  fsconfig$FSCONFIG_SET_BINARY arguments: [
  //    fd: fd_fscontext (resource)
  //    cmd: const = 0x2 (4 bytes)
  //    key: ptr[in, buffer] {
  //      buffer: {6d 65 6d 00 ff 45 65 76 f2 72 f1 18 1d b9 00 79 5f 68 75 67
  //      24 08 6f 2d 03 51 60 5d 6f 8c 72 9d 5f 65 74 6c f9 dd 07 ad 5c 48 e9
  //      34 08 2c 48 bf} (length 0x30)
  //    }
  //    value: nil
  //    aux: bytesize = 0x0 (4 bytes)
  //  ]
  memcpy((void*)0x80000040,
         "mem\000\377Eev\362r\361\030\035\271\000y_hug$\bo-\003Q`]o\214r\235_"
         "etl\371\335\a\255\\H\3514\b,H\277",
         48);
  syscall(__NR_fsconfig, /*fd=*/(intptr_t)-1, /*cmd=*/2, /*key=*/0x80000040,
          /*value=*/0, /*aux=*/0);
  //  syz_open_procfs arguments: [
  //    pid: pid (resource)
  //    file: ptr[in, buffer] {
  //      buffer: {} (length 0x0)
  //    }
  //  ]
  //  returns fd
  res = -1;
  res = syz_open_procfs(/*pid=*/0, /*file=*/0x80000040);
  if (res != -1)
    r[0] = res;
  //  mkdir arguments: [
  //    path: ptr[in, buffer] {
  //      buffer: {6d 79 5f 73 79 73 00} (length 0x7)
  //    }
  //    mode: open_mode = 0x1ff (4 bytes)
  //  ]
  memcpy((void*)0x80000000, "my_sys\000", 7);
  syscall(
      __NR_mkdir, /*path=*/0x80000000,
      /*mode=S_IXOTH|S_IWOTH|S_IROTH|S_IXGRP|S_IWGRP|S_IRGRP|S_IXUSR|S_IWUSR|0x100*/
      0x1ff);
  //  mount arguments: [
  //    src: nil
  //    dst: ptr[in, buffer] {
  //      buffer: {6d 79 5f 73 79 73 00} (length 0x7)
  //    }
  //    type: ptr[in, buffer] {
  //      buffer: {73 79 73 66 73 00} (length 0x6)
  //    }
  //    flags: mount_flags = 0x0 (4 bytes)
  //    data: nil
  //  ]
  memcpy((void*)0x80000200, "my_sys\000", 7);
  memcpy((void*)0x80000300, "sysfs\000", 6);
  syscall(__NR_mount, /*src=*/0, /*dst=*/0x80000200, /*type=*/0x80000300,
          /*flags=*/0, /*data=*/0);
  //  openat arguments: [
  //    fd: fd_dir (resource)
  //    file: ptr[in, buffer] {
  //      buffer: {6d 79 5f 73 79 73 2f 62 75 73 2f 70 63 69 2f 64 65 76 69 63
  //      65 73 2f 30 30 30 30 3a 30 30 3a 30 33 2e 30 2f 72 65 73 6f 75 72 63
  //      65 31 00} (length 0x2e)
  //    }
  //    flags: open_flags = 0x2 (4 bytes)
  //    mode: open_mode = 0x0 (2 bytes)
  //  ]
  //  returns fd
  memcpy((void*)0x80000500, "my_sys/bus/pci/devices/0000:00:03.0/resource1\000",
         46);
  res = syscall(__NR_openat, /*fd=*/0xffffff9c, /*file=*/0x80000500,
                /*flags=O_RDWR*/ 2, /*mode=*/0);
  if (res != -1)
    r[1] = res;
  //  mmap$IORING_OFF_SQ_RING arguments: [
  //    addr: const = 0x0 (4 bytes)
  //    len: int32 = 0x4 (4 bytes)
  //    prot: mmap_prot = 0x1000002 (4 bytes)
  //    flags: mmap_flags = 0x12 (4 bytes)
  //    fd: fd_io_uring (resource)
  //    offset: const = 0x0 (4 bytes)
  //  ]
  //  returns ring_ptr
  syscall(__NR_mmap, /*addr=*/0, /*len=*/4,
          /*prot=PROT_GROWSDOWN|PROT_WRITE*/ 0x1000002,
          /*flags=MAP_FIXED|MAP_PRIVATE*/ 0x12, /*fd=*/(intptr_t)r[1],
          /*offset=*/0);
  //  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: nil
  //  ]
  //  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=*/0);
  //  readv arguments: [
  //    fd: fd (resource)
  //    vec: ptr[in, array[iovec[out, array[int8]]]] {
  //      array[iovec[out, array[int8]]] {
  //        iovec[out, array[int8]] {
  //          addr: ptr[out, buffer] {
  //            buffer: (DirOut)
  //          }
  //          len: len = 0x1f (4 bytes)
  //        }
  //        iovec[out, array[int8]] {
  //          addr: nil
  //          len: len = 0x0 (4 bytes)
  //        }
  //      }
  //    }
  //    vlen: len = 0x2 (4 bytes)
  //  ]
  *(uint32_t*)0x80000100 = 0x80000000;
  *(uint32_t*)0x80000104 = 0x1f;
  *(uint32_t*)0x80000108 = 0;
  *(uint32_t*)0x8000010c = 0;
  syscall(__NR_readv, /*fd=*/(intptr_t)r[0], /*vec=*/0x80000100, /*vlen=*/2);
  return 0;
}