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