sysdeps/unix/sysv/linux/ptrace.c

   1 /* Copyright (C) 1995,1996,1997,1998,2000,2003 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3
   4    The GNU C Library is free software; you can redistribute it and/or
   5    modify it under the terms of the GNU Lesser General Public
   6    License as published by the Free Software Foundation; either
   7    version 2.1 of the License, or (at your option) any later version.
   8
   9    The GNU C Library is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12    Lesser General Public License for more details.
  13
  14    You should have received a copy of the GNU Lesser General Public
  15    License along with the GNU C Library; if not, write to the Free
  16    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  17    02111-1307 USA.  */
  18
  19 #include <errno.h>
  20 #include <sys/types.h>
  21 #include <sys/ptrace.h>
  22 #include <sys/user.h>
  23 #include <stdarg.h>
  24
  25 #include <sysdep.h>
  26 #include <sys/syscall.h>
  27 #include <bp-checks.h>
  28
  29 long int
  30 ptrace (enum __ptrace_request request, ...)
  31 {
  32   long int res, ret;
  33   va_list ap;
  34   pid_t pid;
  35   void *addr, *data;
  36
  37   va_start (ap, request);
  38   pid = va_arg (ap, pid_t);
  39   addr = va_arg (ap, void *);
  40   data = va_arg (ap, void *);
  41   va_end (ap);
  42
  43   if (request > 0 && request < 4)
  44     data = &ret;
  45
  46 #if __BOUNDED_POINTERS__
  47   switch (request)
  48     {
  49     case PTRACE_PEEKTEXT:
  50     case PTRACE_PEEKDATA:
  51     case PTRACE_PEEKUSER:
  52     case PTRACE_POKETEXT:
  53     case PTRACE_POKEDATA:
  54     case PTRACE_POKEUSER:
  55       (void) CHECK_1 ((int *) addr);
  56       (void) CHECK_1 ((int *) data);
  57       break;
  58
  59     case PTRACE_GETREGS:
  60     case PTRACE_SETREGS:
  61 #ifdef __i386__
  62       (void) CHECK_1 ((struct user_regs_struct *) data);
  63 #else
  64       /* We don't know the size of data, so the best we can do is ensure
  65          that `data' is valid for at least one word.  */
  66       (void) CHECK_1 ((int *) data);
  67 #endif
  68       break;
  69
  70     case PTRACE_GETFPREGS:
  71     case PTRACE_SETFPREGS:
  72 #ifdef __i386__
  73       (void) CHECK_1 ((struct user_fpregs_struct *) data);
  74 #else
  75       /* We don't know the size of data, so the best we can do is ensure
  76          that `data' is valid for at least one word.  */
  77       (void) CHECK_1 ((int *) data);
  78 #endif
  79       break;
  80
  81     case PTRACE_GETFPXREGS:
  82     case PTRACE_SETFPXREGS:
  83 #ifdef __i386__
  84       (void) CHECK_1 ((struct user_fpxregs_struct *) data);
  85 #else
  86       /* We don't know the size of data, so the best we can do is ensure
  87          that `data' is valid for at least one word.  */
  88       (void) CHECK_1 ((int *) data);
  89 #endif
  90       break;
  91
  92     case PTRACE_TRACEME:
  93     case PTRACE_CONT:
  94     case PTRACE_KILL:
  95     case PTRACE_SINGLESTEP:
  96     case PTRACE_ATTACH:
  97     case PTRACE_DETACH:
  98     case PTRACE_SYSCALL:
  99       /* Neither `data' nor `addr' needs any checks.  */
 100       break;
 101     };
 102 #endif
 103
 104   res = INLINE_SYSCALL (ptrace, 4, request, pid,
 105                         __ptrvalue (addr), __ptrvalue (data));
 106   if (res >= 0 && request > 0 && request < 4)
 107     {
 108       __set_errno (0);
 109       return ret;
 110     }
 111
 112   return res;
 113 }