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

   1 /*
   2  * Copyright (c) 1991, 1992 Paul Kranenburg <pk@cs.few.eur.nl>
   3  * Copyright (c) 1993 Branko Lankester <branko@hacktic.nl>
   4  * Copyright (c) 1993, 1994, 1995, 1996 Rick Sladkey <jrs@world.std.com>
   5  * Copyright (c) 1996-1999 Wichert Akkerman <wichert@cistron.nl>
   6  * Copyright (c) 1999 IBM Deutschland Entwicklung GmbH, IBM Corporation
   7  *                     Linux for s390 port by D.J. Barrow
   8  *                    <barrow_dj@mail.yahoo.com,djbarrow@de.ibm.com>
   9  * Copyright (c) 2000 PocketPenguins Inc.  Linux for Hitachi SuperH
  10  *                    port by Greg Banks <gbanks@pocketpenguins.com>
  11  * Copyright (c) 1999-2018 The strace developers.
  12  *
  13  * All rights reserved.
  14  *
  15  * Redistribution and use in source and binary forms, with or without
  16  * modification, are permitted provided that the following conditions
  17  * are met:
  18  * 1. Redistributions of source code must retain the above copyright
  19  *    notice, this list of conditions and the following disclaimer.
  20  * 2. Redistributions in binary form must reproduce the above copyright
  21  *    notice, this list of conditions and the following disclaimer in the
  22  *    documentation and/or other materials provided with the distribution.
  23  * 3. The name of the author may not be used to endorse or promote products
  24  *    derived from this software without specific prior written permission.
  25  *
  26  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  27  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  28  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  29  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  30  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  31  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  32  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  33  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  34  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  35  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  36  */
  37
  38 #include "defs.h"
  39
  40 #ifdef HAVE_ELF_H
  41 # include <elf.h>
  42 #endif
  43
  44 #include "ptrace.h"
  45 #include "regs.h"
  46
  47 #include "xlat/nt_descriptor_types.h"
  48 #include "xlat/ptrace_cmds.h"
  49 #include "xlat/ptrace_setoptions_flags.h"
  50 #include "xlat/ptrace_peeksiginfo_flags.h"
  51
  52 #define uoff(member)    offsetof(struct user, member)
  53 #define XLAT_UOFF(member)       { uoff(member), "offsetof(struct user, " #member ")" }
  54
  55 static const struct xlat struct_user_offsets[] = {
  56 #include "userent.h"
  57         XLAT_END
  58 };
  59
  60 static void
  61 print_user_offset_addr(const kernel_ulong_t addr)
  62 {
  63         const struct xlat *x;
  64
  65         for (x = struct_user_offsets; x->str; ++x) {
  66                 if (x->val >= addr)
  67                         break;
  68         }
  69
  70         if (!x->str) {
  71                 printaddr(addr);
  72         } else if (x->val > addr) {
  73                 if (x == struct_user_offsets) {
  74                         printaddr(addr);
  75                 } else {
  76                         --x;
  77                         tprintf("%s + %" PRI_klu,
  78                                 x->str, addr - (kernel_ulong_t) x->val);
  79                 }
  80         } else {
  81                 tprints(x->str);
  82         }
  83 }
  84
  85 SYS_FUNC(ptrace)
  86 {
  87         const kernel_ulong_t request = tcp->u_arg[0];
  88         const int pid = tcp->u_arg[1];
  89         const kernel_ulong_t addr = tcp->u_arg[2];
  90         const kernel_ulong_t data = tcp->u_arg[3];
  91
  92         if (entering(tcp)) {
  93                 /* request */
  94                 printxval64(ptrace_cmds, request, "PTRACE_???");
  95
  96                 if (request == PTRACE_TRACEME) {
  97                         /* pid, addr, and data are ignored. */
  98                         return RVAL_DECODED;
  99                 }
 100
 101                 /* pid */
 102                 tprintf(", %d", pid);
 103
 104                 /* addr */
 105                 switch (request) {
 106                 case PTRACE_ATTACH:
 107                 case PTRACE_INTERRUPT:
 108                 case PTRACE_KILL:
 109                 case PTRACE_LISTEN:
 110                         /* addr and data are ignored */
 111                         return RVAL_DECODED;
 112                 case PTRACE_PEEKUSER:
 113                 case PTRACE_POKEUSER:
 114                         tprints(", ");
 115                         print_user_offset_addr(addr);
 116                         break;
 117                 case PTRACE_GETREGSET:
 118                 case PTRACE_SETREGSET:
 119                         tprints(", ");
 120                         printxval(nt_descriptor_types, addr, "NT_???");
 121                         break;
 122                 case PTRACE_GETSIGMASK:
 123                 case PTRACE_SETSIGMASK:
 124                 case PTRACE_SECCOMP_GET_FILTER:
 125                 case PTRACE_SECCOMP_GET_METADATA:
 126                         tprintf(", %" PRI_klu, addr);
 127                         break;
 128                 case PTRACE_PEEKSIGINFO: {
 129                         tprints(", ");
 130                         struct {
 131                                 uint64_t off;
 132                                 uint32_t flags;
 133                                 uint32_t nr;
 134                         } psi;
 135                         if (umove_or_printaddr(tcp, addr, &psi)) {
 136                                 tprints(", ");
 137                                 printaddr(data);
 138                                 return RVAL_DECODED;
 139                         }
 140                         tprintf("{off=%" PRIu64 ", flags=", psi.off);
 141                         printflags(ptrace_peeksiginfo_flags, psi.flags,
 142                                    "PTRACE_PEEKSIGINFO_???");
 143                         tprintf(", nr=%u}", psi.nr);
 144                         break;
 145                 }
 146                 default:
 147                         tprints(", ");
 148                         printaddr(addr);
 149                 }
 150
 151 # if defined IA64 || defined SPARC || defined SPARC64
 152                 switch (request) {
 153 #  ifdef IA64
 154                 case PTRACE_PEEKDATA:
 155                 case PTRACE_PEEKTEXT:
 156                 case PTRACE_PEEKUSER:
 157                         /* data is ignored */
 158                         return RVAL_DECODED | RVAL_HEX;
 159 #  endif /* IA64 */
 160 #  if defined SPARC || defined SPARC64
 161                 case PTRACE_GETREGS:
 162                 case PTRACE_SETREGS:
 163                 case PTRACE_GETFPREGS:
 164                 case PTRACE_SETFPREGS:
 165                         /* data is ignored */
 166                         return RVAL_DECODED;
 167 #  endif /* SPARC || SPARC64 */
 168                 }
 169 # endif /* IA64 || SPARC || SPARC64 */
 170
 171                 tprints(", ");
 172
 173                 /* data */
 174                 switch (request) {
 175                 case PTRACE_CONT:
 176                 case PTRACE_DETACH:
 177                 case PTRACE_SYSCALL:
 178 #ifdef PTRACE_SINGLESTEP
 179                 case PTRACE_SINGLESTEP:
 180 #endif
 181 #ifdef PTRACE_SINGLEBLOCK
 182                 case PTRACE_SINGLEBLOCK:
 183 #endif
 184 #ifdef PTRACE_SYSEMU
 185                 case PTRACE_SYSEMU:
 186 #endif
 187 #ifdef PTRACE_SYSEMU_SINGLESTEP
 188                 case PTRACE_SYSEMU_SINGLESTEP:
 189 #endif
 190                         printsignal(data);
 191                         break;
 192                 case PTRACE_SEIZE:
 193                 case PTRACE_SETOPTIONS:
 194 #ifdef PTRACE_OLDSETOPTIONS
 195                 case PTRACE_OLDSETOPTIONS:
 196 #endif
 197                         printflags64(ptrace_setoptions_flags, data, "PTRACE_O_???");
 198                         break;
 199                 case PTRACE_SETSIGINFO:
 200                         printsiginfo_at(tcp, data);
 201                         break;
 202                 case PTRACE_SETSIGMASK:
 203                         print_sigset_addr_len(tcp, data, addr);
 204                         break;
 205                 case PTRACE_SETREGSET:
 206                         tprint_iov(tcp, /*len:*/ 1, data, IOV_DECODE_ADDR);
 207                         break;
 208                 case PTRACE_SECCOMP_GET_METADATA:
 209                         if (verbose(tcp)) {
 210                                 uint64_t filter_off;
 211                                 if (addr < sizeof(filter_off) ||
 212                                     umove(tcp, data, &filter_off)) {
 213                                         printaddr(data);
 214                                         return RVAL_DECODED;
 215                                 }
 216
 217                                 tprintf("{filter_off=%" PRIu64, filter_off);
 218                                 return 0;
 219                         }
 220
 221                         printaddr(data);
 222                         break;
 223 #ifndef IA64
 224                 case PTRACE_PEEKDATA:
 225                 case PTRACE_PEEKTEXT:
 226                 case PTRACE_PEEKUSER:
 227 #endif
 228                 case PTRACE_GETEVENTMSG:
 229                 case PTRACE_GETREGSET:
 230                 case PTRACE_GETSIGINFO:
 231                 case PTRACE_GETSIGMASK:
 232                 case PTRACE_PEEKSIGINFO:
 233                 case PTRACE_SECCOMP_GET_FILTER:
 234                         if (verbose(tcp)) {
 235                                 /* print data on exiting syscall */
 236                                 return 0;
 237                         }
 238                         ATTRIBUTE_FALLTHROUGH;
 239                 default:
 240                         printaddr(data);
 241                         break;
 242                 }
 243
 244                 return RVAL_DECODED;
 245         } else {
 246                 switch (request) {
 247 #ifndef IA64
 248                 case PTRACE_PEEKDATA:
 249                 case PTRACE_PEEKTEXT:
 250                 case PTRACE_PEEKUSER:
 251                         printnum_ptr(tcp, data);
 252                         break;
 253 #endif
 254                 case PTRACE_GETEVENTMSG:
 255                         printnum_ulong(tcp, data);
 256                         break;
 257                 case PTRACE_GETREGSET:
 258                         tprint_iov(tcp, /*len:*/ 1, data, IOV_DECODE_ADDR);
 259                         break;
 260                 case PTRACE_GETSIGINFO:
 261                         printsiginfo_at(tcp, data);
 262                         break;
 263                 case PTRACE_GETSIGMASK:
 264                         print_sigset_addr_len(tcp, data, addr);
 265                         break;
 266                 case PTRACE_PEEKSIGINFO:
 267                         print_siginfo_array(tcp, data, tcp->u_rval);
 268                         break;
 269                 case PTRACE_SECCOMP_GET_FILTER:
 270                         print_seccomp_fprog(tcp, data, tcp->u_rval);
 271                         break;
 272                 case PTRACE_SECCOMP_GET_METADATA: {
 273                         const size_t offset = sizeof(uint64_t);
 274                         uint64_t flags = 0;
 275                         size_t ret_size = MIN((kernel_ulong_t) tcp->u_rval,
 276                                               offset + sizeof(flags));
 277
 278                         if (syserror(tcp) || ret_size <= offset) {
 279                                 tprints("}");
 280                                 return 0;
 281                         }
 282
 283                         if (umoven(tcp, data + offset, ret_size - offset,
 284                                    &flags)) {
 285                                 tprints(", ...}");
 286                                 return 0;
 287                         }
 288
 289                         tprints(", flags=");
 290                         printflags64(seccomp_filter_flags, flags,
 291                                      "SECCOMP_FILTER_FLAG_???");
 292
 293                         if ((kernel_ulong_t) tcp->u_rval > ret_size)
 294                                 tprints(", ...");
 295
 296                         tprints("}");
 297                 }
 298                 }
 299         }
 300         return 0;
 301 }