elf/tst-_dl_addr_inside_object.c

   1 /* Unit test for _dl_addr_inside_object.
   2    Copyright (C) 2016-2017 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Lesser General Public
   7    License as published by the Free Software Foundation; either
   8    version 2.1 of the License, or (at your option) any later version.
   9
  10    The GNU C Library is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public
  16    License along with the GNU C Library; if not, see
  17    <http://www.gnu.org/licenses/>.  */
  18
  19 #include <stdio.h>
  20 #include <stdlib.h>
  21 #include <link.h>
  22 #include <elf.h>
  23 #include <libc-symbols.h>
  24
  25 extern int internal_function _dl_addr_inside_object (struct link_map *l,
  26                                                      const ElfW(Addr) addr);
  27
  28 static int
  29 do_test (void)
  30 {
  31   int ret, err = 0;
  32   ElfW(Addr) addr;
  33   struct link_map map;
  34   ElfW(Phdr) header;
  35   map.l_phdr = &header;
  36   map.l_phnum = 1;
  37   map.l_addr = 0x0;
  38   /* Segment spans 0x2000 -> 0x4000.  */
  39   header.p_vaddr = 0x2000;
  40   header.p_memsz = 0x2000;
  41   header.p_type = PT_LOAD;
  42   /* Address is above the segment e.g. > 0x4000.  */
  43   addr = 0x5000;
  44   ret = _dl_addr_inside_object (&map, addr);
  45   switch (ret)
  46     {
  47       case 0:
  48         printf ("PASS: Above: Address is detected as outside the segment.\n");
  49         break;
  50       case 1:
  51         printf ("FAIL: Above: Address is detected as inside the segment.\n");
  52         err++;
  53         break;
  54       default:
  55         printf ("FAIL: Above: Invalid return value.\n");
  56         exit (1);
  57     }
  58   /* Address is inside the segment e.g. 0x2000 < addr < 0x4000.  */
  59   addr = 0x3000;
  60   ret = _dl_addr_inside_object (&map, addr);
  61   switch (ret)
  62     {
  63       case 0:
  64         printf ("FAIL: Inside: Address is detected as outside the segment.\n");
  65         err++;
  66         break;
  67       case 1:
  68         printf ("PASS: Inside: Address is detected as inside the segment.\n");
  69         break;
  70       default:
  71         printf ("FAIL: Inside: Invalid return value.\n");
  72         exit (1);
  73     }
  74   /* Address is below the segment e.g. < 0x2000.  */
  75   addr = 0x1000;
  76   ret = _dl_addr_inside_object (&map, addr);
  77   switch (ret)
  78     {
  79       case 0:
  80         printf ("PASS: Below: Address is detected as outside the segment.\n");
  81         break;
  82       case 1:
  83         printf ("FAIL: Below: Address is detected as inside the segment.\n");
  84         err++;
  85         break;
  86       default:
  87         printf ("FAIL: Below: Invalid return value.\n");
  88         exit (1);
  89     }
  90   /* Address is in the segment and addr == p_vaddr.  */
  91   addr = 0x2000;
  92   ret = _dl_addr_inside_object (&map, addr);
  93   switch (ret)
  94     {
  95       case 0:
  96         printf ("FAIL: At p_vaddr: Address is detected as outside the segment.\n");
  97         err++;
  98         break;
  99       case 1:
 100         printf ("PASS: At p_vaddr: Address is detected as inside the segment.\n");
 101         break;
 102       default:
 103         printf ("FAIL: At p_vaddr: Invalid return value.\n");
 104         exit (1);
 105     }
 106   /* Address is in the segment and addr == p_vaddr + p_memsz - 1.  */
 107   addr = 0x2000 + 0x2000 - 0x1;
 108   ret = _dl_addr_inside_object (&map, addr);
 109   switch (ret)
 110     {
 111       case 0:
 112         printf ("FAIL: At p_memsz-1: Address is detected as outside the segment.\n");
 113         err++;
 114         break;
 115       case 1:
 116         printf ("PASS: At p_memsz-1: Address is detected as inside the segment.\n");
 117         break;
 118       default:
 119         printf ("FAIL: At p_memsz-1: Invalid return value.\n");
 120         exit (1);
 121     }
 122   /* Address is outside the segment and addr == p_vaddr + p_memsz.  */
 123   addr = 0x2000 + 0x2000;
 124   ret = _dl_addr_inside_object (&map, addr);
 125   switch (ret)
 126     {
 127       case 0:
 128         printf ("PASS: At p_memsz: Address is detected as outside the segment.\n");
 129         break;
 130       case 1:
 131         printf ("FAIL: At p_memsz: Address is detected as inside the segment.\n");
 132         err++;
 133         break;
 134       default:
 135         printf ("FAIL: At p_memsz: Invalid return value.\n");
 136         exit (1);
 137     }
 138   /* Address is outside the segment and p_vaddr at maximum address.  */
 139   addr = 0x0 - 0x2;
 140   header.p_vaddr = 0x0 - 0x1;
 141   header.p_memsz = 0x1;
 142   ret = _dl_addr_inside_object (&map, addr);
 143   switch (ret)
 144     {
 145       case 0:
 146         printf ("PASS: At max: Address is detected as outside the segment.\n");
 147         break;
 148       case 1:
 149         printf ("FAIL: At max: Address is detected as inside the segment.\n");
 150         err++;
 151         break;
 152       default:
 153         printf ("FAIL: At max: Invalid return value.\n");
 154         exit (1);
 155     }
 156   /* Address is outside the segment and p_vaddr at minimum address.  */
 157   addr = 0x1;
 158   header.p_vaddr = 0x0;
 159   header.p_memsz = 0x1;
 160   ret = _dl_addr_inside_object (&map, addr);
 161   switch (ret)
 162     {
 163       case 0:
 164         printf ("PASS: At min: Address is detected as outside the segment.\n");
 165         break;
 166       case 1:
 167         printf ("FAIL: At min: Address is detected as inside the segment.\n");
 168         err++;
 169         break;
 170       default:
 171         printf ("FAIL: At min: Invalid return value.\n");
 172         exit (1);
 173     }
 174   /* Address is always inside the segment with p_memsz at max.  */
 175   addr = 0x0;
 176   header.p_vaddr = 0x0;
 177   header.p_memsz = 0x0 - 0x1;
 178   ret = _dl_addr_inside_object (&map, addr);
 179   switch (ret)
 180     {
 181       case 0:
 182         printf ("FAIL: At maxmem: Address is detected as outside the segment.\n");
 183         err++;
 184         break;
 185       case 1:
 186         printf ("PASS: At maxmem: Address is detected as inside the segment.\n");
 187         break;
 188       default:
 189         printf ("FAIL: At maxmem: Invalid return value.\n");
 190         exit (1);
 191     }
 192   /* Attempt to wrap addr into the segment.
 193      Pick a load address in the middle of the address space.
 194      Place the test address at 0x0 so it wraps to the middle again.  */
 195   map.l_addr = 0x0 - 0x1;
 196   map.l_addr = map.l_addr / 2;
 197   addr = 0;
 198   /* Setup a segment covering 1/2 the address space.  */
 199   header.p_vaddr = 0x0;
 200   header.p_memsz = 0x0 - 0x1 - map.l_addr;
 201   /* No matter where you place addr everything is shifted modulo l_addr
 202      and even with this underflow you're always 1 byte away from being
 203      in the range.  */
 204   ret = _dl_addr_inside_object (&map, addr);
 205   switch (ret)
 206     {
 207       case 0:
 208         printf ("PASS: Underflow: Address is detected as outside the segment.\n");
 209         break;
 210       case 1:
 211         printf ("FAIL: Underflow: Address is detected as inside the segment.\n");
 212         err++;
 213         break;
 214       default:
 215         printf ("FAIL: Underflow: Invalid return value.\n");
 216         exit (1);
 217     }
 218
 219   return err;
 220 }
 221
 222 #include <support/test-driver.c>