1 /* 2 * Copyright (c) 2012 The Chromium OS Authors. 3 * Copyright (c) 2012-2018 The strace developers. 4 * Written by Mike Frysinger <vapier (at) gentoo.org>. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 3. The name of the author may not be used to endorse or promote products 15 * derived from this software without specific prior written permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 18 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 19 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 20 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 21 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 22 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 27 */ 28 29 #include "defs.h" 30 #include <linux/ioctl.h> 31 #include <linux/loop.h> 32 33 typedef struct loop_info struct_loop_info; 34 35 #include DEF_MPERS_TYPE(struct_loop_info) 36 37 #include MPERS_DEFS 38 39 #include "print_fields.h" 40 #include "xlat/loop_cmds.h" 41 #include "xlat/loop_flags_options.h" 42 #include "xlat/loop_crypt_type_options.h" 43 44 static void 45 decode_loop_info(struct tcb *const tcp, const kernel_ulong_t addr) 46 { 47 struct_loop_info info; 48 49 tprints(", "); 50 if (umove_or_printaddr(tcp, addr, &info)) 51 return; 52 53 tprintf("{lo_number=%d", info.lo_number); 54 55 if (!abbrev(tcp)) { 56 PRINT_FIELD_DEV(", ", info, lo_device); 57 tprintf(", lo_inode=%" PRI_klu, (kernel_ulong_t) info.lo_inode); 58 PRINT_FIELD_DEV(", ", 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 PRINT_FIELD_CSTRING(", ", info, lo_name); 79 80 if (!abbrev(tcp) || info.lo_encrypt_type != LO_CRYPT_NONE) { 81 const unsigned int lo_encrypt_key_size = 82 MIN((unsigned) info.lo_encrypt_key_size, LO_KEY_SIZE); 83 PRINT_FIELD_STRING(", ", info, lo_encrypt_key, 84 lo_encrypt_key_size, 0); 85 } 86 87 if (!abbrev(tcp)) 88 tprintf(", lo_init=[%#" PRI_klx ", %#" PRI_klx "]" 89 ", reserved=[%#hhx, %#hhx, %#hhx, %#hhx]}", 90 (kernel_ulong_t) info.lo_init[0], 91 (kernel_ulong_t) info.lo_init[1], 92 info.reserved[0], info.reserved[1], 93 info.reserved[2], info.reserved[3]); 94 else 95 tprints(", ...}"); 96 } 97 98 static void 99 decode_loop_info64(struct tcb *const tcp, const kernel_ulong_t addr) 100 { 101 struct loop_info64 info64; 102 103 tprints(", "); 104 if (umove_or_printaddr(tcp, addr, &info64)) 105 return; 106 107 if (!abbrev(tcp)) { 108 PRINT_FIELD_DEV("{", info64, lo_device); 109 tprintf(", lo_inode=%" PRIu64, (uint64_t) info64.lo_inode); 110 PRINT_FIELD_DEV(", ", info64, lo_rdevice); 111 tprintf(", lo_offset=%#" PRIx64 ", lo_sizelimit=%" PRIu64 112 ", lo_number=%" PRIu32, 113 (uint64_t) info64.lo_offset, 114 (uint64_t) info64.lo_sizelimit, 115 (uint32_t) info64.lo_number); 116 } else { 117 tprintf("{lo_offset=%#" PRIx64 ", lo_number=%" PRIu32, 118 (uint64_t) info64.lo_offset, 119 (uint32_t) info64.lo_number); 120 } 121 122 if (!abbrev(tcp) || info64.lo_encrypt_type != LO_CRYPT_NONE) { 123 tprints(", lo_encrypt_type="); 124 printxval(loop_crypt_type_options, info64.lo_encrypt_type, 125 "LO_CRYPT_???"); 126 tprintf(", lo_encrypt_key_size=%" PRIu32, 127 info64.lo_encrypt_key_size); 128 } 129 130 tprints(", lo_flags="); 131 printflags(loop_flags_options, info64.lo_flags, "LO_FLAGS_???"); 132 133 PRINT_FIELD_CSTRING(", ", info64, lo_file_name); 134 135 if (!abbrev(tcp) || info64.lo_encrypt_type != LO_CRYPT_NONE) { 136 PRINT_FIELD_CSTRING(", ", info64, lo_crypt_name); 137 const unsigned int lo_encrypt_key_size = 138 MIN((unsigned) info64.lo_encrypt_key_size, LO_KEY_SIZE); 139 PRINT_FIELD_STRING(", ", info64, lo_encrypt_key, 140 lo_encrypt_key_size, 0); 141 } 142 143 if (!abbrev(tcp)) 144 tprintf(", lo_init=[%#" PRIx64 ", %#" PRIx64 "]}", 145 (uint64_t) info64.lo_init[0], 146 (uint64_t) info64.lo_init[1]); 147 else 148 tprints(", ...}"); 149 } 150 151 MPERS_PRINTER_DECL(int, loop_ioctl, 152 struct tcb *tcp, const unsigned int code, 153 const kernel_ulong_t arg) 154 { 155 switch (code) { 156 case LOOP_GET_STATUS: 157 if (entering(tcp)) 158 return 0; 159 ATTRIBUTE_FALLTHROUGH; 160 case LOOP_SET_STATUS: 161 decode_loop_info(tcp, arg); 162 break; 163 164 case LOOP_GET_STATUS64: 165 if (entering(tcp)) 166 return 0; 167 ATTRIBUTE_FALLTHROUGH; 168 case LOOP_SET_STATUS64: 169 decode_loop_info64(tcp, arg); 170 break; 171 172 case LOOP_CLR_FD: 173 case LOOP_SET_CAPACITY: 174 /* newer loop-control stuff */ 175 case LOOP_CTL_GET_FREE: 176 /* Takes no arguments */ 177 break; 178 179 case LOOP_SET_FD: 180 case LOOP_CHANGE_FD: 181 tprints(", "); 182 printfd(tcp, arg); 183 break; 184 185 /* newer loop-control stuff */ 186 case LOOP_CTL_ADD: 187 case LOOP_CTL_REMOVE: 188 tprintf(", %d", (int) arg); 189 break; 190 191 case LOOP_SET_DIRECT_IO: 192 case LOOP_SET_BLOCK_SIZE: 193 tprintf(", %" PRI_klu, arg); 194 break; 195 196 default: 197 return RVAL_DECODED; 198 } 199 200 return RVAL_IOCTL_DECODED; 201 } 202
