granicus.if.org Git - strace/blob - nsfs.c

   1 /*
   2  * Support for decoding of NS_* ioctl commands.
   3  *
   4  * Copyright (c) 2017 Nikolay Marchuk <marchuk.nikolay.a@gmail.com>
   5  * Copyright (c) 2017-2018 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 "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                 tprints(", ");
  32                 if (!umove_or_printaddr(tcp, arg, &uid)) {
  33                         printuid("[", uid);
  34                         tprints("]");
  35                 }
  36                 return RVAL_IOCTL_DECODED;
  37         default:
  38                 return RVAL_DECODED;
  39         }
  40 }