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

   1 /*
   2  * Copyright (c) 2012 The Chromium OS Authors.
   3  * Written by Mike Frysinger <vapier@gentoo.org>.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  * 3. The name of the author may not be used to endorse or promote products
  14  *    derived from this software without specific prior written permission.
  15  *
  16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  17  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  18  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  19  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  20  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  21  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  22  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  23  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  24  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  25  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  26  */
  27
  28 #include "defs.h"
  29 #include <linux/ioctl.h>
  30 #include <linux/loop.h>
  31
  32 typedef struct loop_info struct_loop_info;
  33
  34 #include DEF_MPERS_TYPE(struct_loop_info)
  35
  36 #include MPERS_DEFS
  37
  38 #include "xlat/loop_cmds.h"
  39 #include "xlat/loop_flags_options.h"
  40 #include "xlat/loop_crypt_type_options.h"
  41
  42 static void
  43 decode_loop_info(struct tcb *const tcp, const kernel_ulong_t addr)
  44 {
  45         struct_loop_info info;
  46
  47         tprints(", ");
  48         if (umove_or_printaddr(tcp, addr, &info))
  49                 return;
  50
  51         tprintf("{lo_number=%d", info.lo_number);
  52
  53         if (!abbrev(tcp)) {
  54                 tprints(", lo_device=");
  55                 print_dev_t(info.lo_device);
  56                 tprintf(", lo_inode=%" PRI_klu, (kernel_ulong_t) info.lo_inode);
  57                 tprints(", lo_rdevice=");
  58                 print_dev_t(info.lo_rdevice);
  59         }
  60
  61         tprintf(", lo_offset=%#x", info.lo_offset);
  62
  63         if (!abbrev(tcp) || info.lo_encrypt_type != LO_CRYPT_NONE) {
  64                 tprints(", lo_encrypt_type=");
  65                 printxval(loop_crypt_type_options, info.lo_encrypt_type,
  66                         "LO_CRYPT_???");
  67                 /*
  68                  * It is converted to unsigned before use in kernel, see
  69                  * loop_info64_from_old in drivers/block/loop.c
  70                  */
  71                 tprintf(", lo_encrypt_key_size=%" PRIu32,
  72                         (uint32_t) info.lo_encrypt_key_size);
  73         }
  74
  75         tprints(", lo_flags=");
  76         printflags(loop_flags_options, info.lo_flags, "LO_FLAGS_???");
  77
  78         tprints(", lo_name=");
  79         print_quoted_string(info.lo_name, LO_NAME_SIZE,
  80                             QUOTE_0_TERMINATED);
  81
  82         if (!abbrev(tcp) || info.lo_encrypt_type != LO_CRYPT_NONE) {
  83                 tprints(", lo_encrypt_key=");
  84                 print_quoted_string((void *) info.lo_encrypt_key,
  85                                     MIN((uint32_t) info.lo_encrypt_key_size,
  86                                     LO_KEY_SIZE), 0);
  87         }
  88
  89         if (!abbrev(tcp))
  90                 tprintf(", lo_init=[%#" PRI_klx ", %#" PRI_klx "]"
  91                         ", reserved=[%#hhx, %#hhx, %#hhx, %#hhx]}",
  92                         (kernel_ulong_t) info.lo_init[0],
  93                         (kernel_ulong_t) info.lo_init[1],
  94                         info.reserved[0], info.reserved[1],
  95                         info.reserved[2], info.reserved[3]);
  96         else
  97                 tprints(", ...}");
  98 }
  99
 100 static void
 101 decode_loop_info64(struct tcb *const tcp, const kernel_ulong_t addr)
 102 {
 103         struct loop_info64 info64;
 104
 105         tprints(", ");
 106         if (umove_or_printaddr(tcp, addr, &info64))
 107                 return;
 108
 109         if (!abbrev(tcp)) {
 110                 tprints("{lo_device=");
 111                 print_dev_t(info64.lo_device);
 112                 tprintf(", lo_inode=%" PRIu64, (uint64_t) info64.lo_inode);
 113                 tprints(", lo_rdevice=");
 114                 print_dev_t(info64.lo_rdevice);
 115                 tprintf(", lo_offset=%#" PRIx64 ", lo_sizelimit=%" PRIu64
 116                         ", lo_number=%" PRIu32,
 117                         (uint64_t) info64.lo_offset,
 118                         (uint64_t) info64.lo_sizelimit,
 119                         (uint32_t) info64.lo_number);
 120         } else {
 121                 tprintf("{lo_offset=%#" PRIx64 ", lo_number=%" PRIu32,
 122                         (uint64_t) info64.lo_offset,
 123                         (uint32_t) info64.lo_number);
 124         }
 125
 126         if (!abbrev(tcp) || info64.lo_encrypt_type != LO_CRYPT_NONE) {
 127                 tprints(", lo_encrypt_type=");
 128                 printxval(loop_crypt_type_options, info64.lo_encrypt_type,
 129                         "LO_CRYPT_???");
 130                 tprintf(", lo_encrypt_key_size=%" PRIu32,
 131                         info64.lo_encrypt_key_size);
 132         }
 133
 134         tprints(", lo_flags=");
 135         printflags(loop_flags_options, info64.lo_flags, "LO_FLAGS_???");
 136
 137         tprints(", lo_file_name=");
 138         print_quoted_string((void *) info64.lo_file_name,
 139                             LO_NAME_SIZE, QUOTE_0_TERMINATED);
 140
 141         if (!abbrev(tcp) || info64.lo_encrypt_type != LO_CRYPT_NONE) {
 142                 tprints(", lo_crypt_name=");
 143                 print_quoted_string((void *) info64.lo_crypt_name,
 144                                     LO_NAME_SIZE, QUOTE_0_TERMINATED);
 145                 tprints(", lo_encrypt_key=");
 146                 print_quoted_string((void *) info64.lo_encrypt_key,
 147                                     MIN(info64.lo_encrypt_key_size,
 148                                     LO_KEY_SIZE), 0);
 149         }
 150
 151         if (!abbrev(tcp))
 152                 tprintf(", lo_init=[%#" PRIx64 ", %#" PRIx64 "]}",
 153                         (uint64_t) info64.lo_init[0],
 154                         (uint64_t) info64.lo_init[1]);
 155         else
 156                 tprints(", ...}");
 157 }
 158
 159 MPERS_PRINTER_DECL(int, loop_ioctl,
 160                    struct tcb *tcp, const unsigned int code,
 161                    const kernel_ulong_t arg)
 162 {
 163         switch (code) {
 164         case LOOP_GET_STATUS:
 165                 if (entering(tcp))
 166                         return 0;
 167                 /* fall through */
 168         case LOOP_SET_STATUS:
 169                 decode_loop_info(tcp, arg);
 170                 break;
 171
 172         case LOOP_GET_STATUS64:
 173                 if (entering(tcp))
 174                         return 0;
 175                 /* fall through */
 176         case LOOP_SET_STATUS64:
 177                 decode_loop_info64(tcp, arg);
 178                 break;
 179
 180         case LOOP_CLR_FD:
 181         case LOOP_SET_CAPACITY:
 182         /* newer loop-control stuff */
 183         case LOOP_CTL_GET_FREE:
 184                 /* Takes no arguments */
 185                 break;
 186
 187         case LOOP_SET_FD:
 188         case LOOP_CHANGE_FD:
 189                 tprints(", ");
 190                 printfd(tcp, arg);
 191                 break;
 192
 193         /* newer loop-control stuff */
 194         case LOOP_CTL_ADD:
 195         case LOOP_CTL_REMOVE:
 196                 tprintf(", %d", (int) arg);
 197                 break;
 198
 199         case LOOP_SET_DIRECT_IO:
 200                 tprintf(", %" PRI_klu, arg);
 201                 break;
 202
 203         default:
 204                 return RVAL_DECODED;
 205         }
 206
 207         return RVAL_DECODED | 1;
 208 }