1  /*
       2   * Support for decoding of NS_* ioctl commands.
       3   *
       4   * Copyright (c) 2017 Nikolay Marchuk <marchuk.nikolay.a@gmail.com>
       5   * Copyright (c) 2017-2021 The strace developers.
       6   * All rights reserved.
       7   *
       8   * SPDX-License-Identifier: LGPL-2.1-or-later
       9   */
      10  
      11  #include "defs.h"
      12  #include <linux/nsfs.h>
      13  
      14  int
      15  nsfs_ioctl(struct tcb *tcp, unsigned int code, kernel_ulong_t arg)
      16  {
      17  	unsigned int uid;
      18  	switch (code) {
      19  	case NS_GET_USERNS:
      20  	case NS_GET_PARENT:
      21  		return RVAL_IOCTL_DECODED | RVAL_FD;
      22  	case NS_GET_NSTYPE:
      23  		if (entering(tcp))
      24  			return 0;
      25  		if (!syserror(tcp))
      26  			tcp->auxstr = xlookup(setns_types, tcp->u_rval);
      27  		return RVAL_IOCTL_DECODED | RVAL_STR;
      28  	case NS_GET_OWNER_UID:
      29  		if (entering(tcp))
      30  			return 0;
      31  		tprint_arg_next();
      32  		if (!umove_or_printaddr(tcp, arg, &uid)) {
      33  			tprint_indirect_begin();
      34  			printuid(uid);
      35  			tprint_indirect_end();
      36  		}
      37  		return RVAL_IOCTL_DECODED;
      38  	default:
      39  		return RVAL_DECODED;
      40  	}
      41  }