elf/tst-_dl_addr_inside_object.c

   1 /* Unit test for _dl_addr_inside_object.
   2    Copyright (C) 2016-2022 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    <https://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 _dl_addr_inside_object (struct link_map *l, const ElfW(Addr) addr);
  26
  27 static int
  28 do_test (void)
  29 {
  30   int ret, err = 0;
  31   ElfW(Addr) addr;
  32   struct link_map map;
  33   ElfW(Phdr) header;
  34   map.l_phdr = &header;
  35   map.l_phnum = 1;
  36   map.l_addr = 0x0;
  37   /* Segment spans 0x2000 -> 0x4000.  */
  38   header.p_vaddr = 0x2000;
  39   header.p_memsz = 0x2000;
  40   header.p_type = PT_LOAD;
  41   /* Address is above the segment e.g. > 0x4000.  */
  42   addr = 0x5000;
  43   ret = _dl_addr_inside_object (&map, addr);
  44   switch (ret)
  45     {
  46       case 0:
  47         printf ("PASS: Above: Address is detected as outside the segment.\n");
  48         break;
  49       case 1:
  50         printf ("FAIL: Above: Address is detected as inside the segment.\n");
  51         err++;
  52         break;
  53       default:
  54         printf ("FAIL: Above: Invalid return value.\n");
  55         exit (1);
  56     }
  57   /* Address is inside the segment e.g. 0x2000 < addr < 0x4000.  */
  58   addr = 0x3000;
  59   ret = _dl_addr_inside_object (&map, addr);
  60   switch (ret)
  61     {
  62       case 0:
  63         printf ("FAIL: Inside: Address is detected as outside the segment.\n");
  64         err++;
  65         break;
  66       case 1:
  67         printf ("PASS: Inside: Address is detected as inside the segment.\n");
  68         break;
  69       default:
  70         printf ("FAIL: Inside: Invalid return value.\n");
  71         exit (1);
  72     }
  73   /* Address is below the segment e.g. < 0x2000.  */
  74   addr = 0x1000;
  75   ret = _dl_addr_inside_object (&map, addr);
  76   switch (ret)
  77     {
  78       case 0:
  79         printf ("PASS: Below: Address is detected as outside the segment.\n");
  80         break;
  81       case 1:
  82         printf ("FAIL: Below: Address is detected as inside the segment.\n");
  83         err++;
  84         break;
  85       default:
  86         printf ("FAIL: Below: Invalid return value.\n");
  87         exit (1);
  88     }
  89   /* Address is in the segment and addr == p_vaddr.  */
  90   addr = 0x2000;
  91   ret = _dl_addr_inside_object (&map, addr);
  92   switch (ret)
  93     {
  94       case 0:
  95         printf ("FAIL: At p_vaddr: Address is detected as outside the segment.\n");
  96         err++;
  97         break;
  98       case 1:
  99         printf ("PASS: At p_vaddr: Address is detected as inside the segment.\n");
 100         break;
 101       default:
 102         printf ("FAIL: At p_vaddr: Invalid return value.\n");
 103         exit (1);
 104     }
 105   /* Address is in the segment and addr == p_vaddr + p_memsz - 1.  */
 106   addr = 0x2000 + 0x2000 - 0x1;
 107   ret = _dl_addr_inside_object (&map, addr);
 108   switch (ret)
 109     {
 110       case 0:
 111         printf ("FAIL: At p_memsz-1: Address is detected as outside the segment.\n");
 112         err++;
 113         break;
 114       case 1:
 115         printf ("PASS: At p_memsz-1: Address is detected as inside the segment.\n");
 116         break;
 117       default:
 118         printf ("FAIL: At p_memsz-1: Invalid return value.\n");
 119         exit (1);
 120     }
 121   /* Address is outside the segment and addr == p_vaddr + p_memsz.  */
 122   addr = 0x2000 + 0x2000;
 123   ret = _dl_addr_inside_object (&map, addr);
 124   switch (ret)
 125     {
 126       case 0:
 127         printf ("PASS: At p_memsz: Address is detected as outside the segment.\n");
 128         break;
 129       case 1:
 130         printf ("FAIL: At p_memsz: Address is detected as inside the segment.\n");
 131         err++;
 132         break;
 133       default:
 134         printf ("FAIL: At p_memsz: Invalid return value.\n");
 135         exit (1);
 136     }
 137   /* Address is outside the segment and p_vaddr at maximum address.  */
 138   addr = 0x0 - 0x2;
 139   header.p_vaddr = 0x0 - 0x1;
 140   header.p_memsz = 0x1;
 141   ret = _dl_addr_inside_object (&map, addr);
 142   switch (ret)
 143     {
 144       case 0:
 145         printf ("PASS: At max: Address is detected as outside the segment.\n");
 146         break;
 147       case 1:
 148         printf ("FAIL: At max: Address is detected as inside the segment.\n");
 149         err++;
 150         break;
 151       default:
 152         printf ("FAIL: At max: Invalid return value.\n");
 153         exit (1);
 154     }
 155   /* Address is outside the segment and p_vaddr at minimum address.  */
 156   addr = 0x1;
 157   header.p_vaddr = 0x0;
 158   header.p_memsz = 0x1;
 159   ret = _dl_addr_inside_object (&map, addr);
 160   switch (ret)
 161     {
 162       case 0:
 163         printf ("PASS: At min: Address is detected as outside the segment.\n");
 164         break;
 165       case 1:
 166         printf ("FAIL: At min: Address is detected as inside the segment.\n");
 167         err++;
 168         break;
 169       default:
 170         printf ("FAIL: At min: Invalid return value.\n");
 171         exit (1);
 172     }
 173   /* Address is always inside the segment with p_memsz at max.  */
 174   addr = 0x0;
 175   header.p_vaddr = 0x0;
 176   header.p_memsz = 0x0 - 0x1;
 177   ret = _dl_addr_inside_object (&map, addr);
 178   switch (ret)
 179     {
 180       case 0:
 181         printf ("FAIL: At maxmem: Address is detected as outside the segment.\n");
 182         err++;
 183         break;
 184       case 1:
 185         printf ("PASS: At maxmem: Address is detected as inside the segment.\n");
 186         break;
 187       default:
 188         printf ("FAIL: At maxmem: Invalid return value.\n");
 189         exit (1);
 190     }
 191   /* Attempt to wrap addr into the segment.
 192      Pick a load address in the middle of the address space.
 193      Place the test address at 0x0 so it wraps to the middle again.  */
 194   map.l_addr = 0x0 - 0x1;
 195   map.l_addr = map.l_addr / 2;
 196   addr = 0;
 197   /* Setup a segment covering 1/2 the address space.  */
 198   header.p_vaddr = 0x0;
 199   header.p_memsz = 0x0 - 0x1 - map.l_addr;
 200   /* No matter where you place addr everything is shifted modulo l_addr
 201      and even with this underflow you're always 1 byte away from being
 202      in the range.  */
 203   ret = _dl_addr_inside_object (&map, addr);
 204   switch (ret)
 205     {
 206       case 0:
 207         printf ("PASS: Underflow: Address is detected as outside the segment.\n");
 208         break;
 209       case 1:
 210         printf ("FAIL: Underflow: Address is detected as inside the segment.\n");
 211         err++;
 212         break;
 213       default:
 214         printf ("FAIL: Underflow: Invalid return value.\n");
 215         exit (1);
 216     }
 217
 218   return err;
 219 }
 220
 221 #include <support/test-driver.c>