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) 1999-2017 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 "xlat/nt_descriptor_types.h"
  45
  46 #include "regs.h"
  47 #include "ptrace.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                         tprintf(", %" PRI_klu, addr);
 126                         break;
 127                 case PTRACE_PEEKSIGINFO: {
 128                         tprints(", ");
 129                         struct {
 130                                 uint64_t off;
 131                                 uint32_t flags;
 132                                 uint32_t nr;
 133                         } psi;
 134                         if (umove_or_printaddr(tcp, addr, &psi)) {
 135                                 tprints(", ");
 136                                 printaddr(data);
 137                                 return RVAL_DECODED;
 138                         }
 139                         tprintf("{off=%" PRIu64 ", flags=", psi.off);
 140                         printflags(ptrace_peeksiginfo_flags, psi.flags,
 141                                    "PTRACE_PEEKSIGINFO_???");
 142                         tprintf(", nr=%u}", psi.nr);
 143                         break;
 144                 }
 145                 default:
 146                         tprints(", ");
 147                         printaddr(addr);
 148                 }
 149
 150 # if defined IA64 || defined SPARC || defined SPARC64
 151                 switch (request) {
 152 #  ifdef IA64
 153                 case PTRACE_PEEKDATA:
 154                 case PTRACE_PEEKTEXT:
 155                 case PTRACE_PEEKUSER:
 156                         /* data is ignored */
 157                         return RVAL_DECODED | RVAL_HEX;
 158 #  endif /* IA64 */
 159 #  if defined SPARC || defined SPARC64
 160                 case PTRACE_GETREGS:
 161                 case PTRACE_SETREGS:
 162                 case PTRACE_GETFPREGS:
 163                 case PTRACE_SETFPREGS:
 164                         /* data is ignored */
 165                         return RVAL_DECODED;
 166 #  endif /* SPARC || SPARC64 */
 167                 }
 168 # endif /* IA64 || SPARC || SPARC64 */
 169
 170                 tprints(", ");
 171
 172                 /* data */
 173                 switch (request) {
 174                 case PTRACE_CONT:
 175                 case PTRACE_DETACH:
 176                 case PTRACE_SYSCALL:
 177 #ifdef PTRACE_SINGLESTEP
 178                 case PTRACE_SINGLESTEP:
 179 #endif
 180 #ifdef PTRACE_SINGLEBLOCK
 181                 case PTRACE_SINGLEBLOCK:
 182 #endif
 183 #ifdef PTRACE_SYSEMU
 184                 case PTRACE_SYSEMU:
 185 #endif
 186 #ifdef PTRACE_SYSEMU_SINGLESTEP
 187                 case PTRACE_SYSEMU_SINGLESTEP:
 188 #endif
 189                         printsignal(data);
 190                         break;
 191                 case PTRACE_SEIZE:
 192                 case PTRACE_SETOPTIONS:
 193 #ifdef PTRACE_OLDSETOPTIONS
 194                 case PTRACE_OLDSETOPTIONS:
 195 #endif
 196                         printflags64(ptrace_setoptions_flags, data, "PTRACE_O_???");
 197                         break;
 198                 case PTRACE_SETSIGINFO:
 199                         printsiginfo_at(tcp, data);
 200                         break;
 201                 case PTRACE_SETSIGMASK:
 202                         print_sigset_addr_len(tcp, data, addr);
 203                         break;
 204                 case PTRACE_SETREGSET:
 205                         tprint_iov(tcp, /*len:*/ 1, data, IOV_DECODE_ADDR);
 206                         break;
 207 #ifndef IA64
 208                 case PTRACE_PEEKDATA:
 209                 case PTRACE_PEEKTEXT:
 210                 case PTRACE_PEEKUSER:
 211 #endif
 212                 case PTRACE_GETEVENTMSG:
 213                 case PTRACE_GETREGSET:
 214                 case PTRACE_GETSIGINFO:
 215                 case PTRACE_GETSIGMASK:
 216                 case PTRACE_PEEKSIGINFO:
 217                 case PTRACE_SECCOMP_GET_FILTER:
 218                         if (verbose(tcp)) {
 219                                 /* print data on exiting syscall */
 220                                 return 0;
 221                         }
 222                         /* fall through */
 223                 default:
 224                         printaddr(data);
 225                         break;
 226                 }
 227
 228                 return RVAL_DECODED;
 229         } else {
 230                 switch (request) {
 231 #ifndef IA64
 232                 case PTRACE_PEEKDATA:
 233                 case PTRACE_PEEKTEXT:
 234                 case PTRACE_PEEKUSER:
 235                         printnum_ptr(tcp, data);
 236                         break;
 237 #endif
 238                 case PTRACE_GETEVENTMSG:
 239                         printnum_ulong(tcp, data);
 240                         break;
 241                 case PTRACE_GETREGSET:
 242                         tprint_iov(tcp, /*len:*/ 1, data, IOV_DECODE_ADDR);
 243                         break;
 244                 case PTRACE_GETSIGINFO:
 245                         printsiginfo_at(tcp, data);
 246                         break;
 247                 case PTRACE_GETSIGMASK:
 248                         print_sigset_addr_len(tcp, data, addr);
 249                         break;
 250                 case PTRACE_PEEKSIGINFO:
 251                         print_siginfo_array(tcp, data, tcp->u_rval);
 252                         break;
 253                 case PTRACE_SECCOMP_GET_FILTER:
 254                         print_seccomp_fprog(tcp, data, tcp->u_rval);
 255                         break;
 256                 }
 257         }
 258         return 0;
 259 }