// SPDX-License-Identifier: GPL-2.0-only
  #include <linux/fault-inject.h>
  #include <linux/fault-inject-usercopy.h>
  
  static struct {
  	struct fault_attr attr;
  } fail_usercopy = {
  	.attr = FAULT_ATTR_INITIALIZER,
  };
  
  static int __init setup_fail_usercopy(char *str)
  {
  	return setup_fault_attr(&fail_usercopy.attr, str);
  }
  __setup("fail_usercopy=", setup_fail_usercopy);
  
  #ifdef CONFIG_FAULT_INJECTION_DEBUG_FS
  
  static int __init fail_usercopy_debugfs(void)
  {
  	struct dentry *dir;
  
  	dir = fault_create_debugfs_attr("fail_usercopy", NULL,
  					&fail_usercopy.attr);
  	if (IS_ERR(dir))
  		return PTR_ERR(dir);
  
  	return 0;
  }
  
  late_initcall(fail_usercopy_debugfs);
  
  #endif /* CONFIG_FAULT_INJECTION_DEBUG_FS */
  
  bool should_fail_usercopy(void)
  {
  	return should_fail(&fail_usercopy.attr, 1);
  }
  EXPORT_SYMBOL_GPL(should_fail_usercopy);