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d61ef7352b
The function _dl_addr_inside_object is simplified by removing the conditional 'reladdr - l->l_phdr[n].p_vaddr >= 0' which is always true. The function is refactored into it's own object file and a unit test added to verify the correct behaviour of the function.
224 lines
6.3 KiB
C
224 lines
6.3 KiB
C
/* Unit test for _dl_addr_inside_object.
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Copyright (C) 2016 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<http://www.gnu.org/licenses/>. */
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#include <stdio.h>
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#include <stdlib.h>
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#include <link.h>
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#include <elf.h>
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#include <libc-symbols.h>
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extern int internal_function _dl_addr_inside_object (struct link_map *l,
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const ElfW(Addr) addr);
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static int
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do_test (void)
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{
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int ret, err = 0;
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ElfW(Addr) addr;
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struct link_map map;
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ElfW(Phdr) header;
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map.l_phdr = &header;
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map.l_phnum = 1;
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map.l_addr = 0x0;
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/* Segment spans 0x2000 -> 0x4000. */
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header.p_vaddr = 0x2000;
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header.p_memsz = 0x2000;
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header.p_type = PT_LOAD;
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/* Address is above the segment e.g. > 0x4000. */
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addr = 0x5000;
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ret = _dl_addr_inside_object (&map, addr);
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switch (ret)
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{
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case 0:
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printf ("PASS: Above: Address is detected as outside the segment.\n");
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break;
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case 1:
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printf ("FAIL: Above: Address is detected as inside the segment.\n");
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err++;
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break;
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default:
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printf ("FAIL: Above: Invalid return value.\n");
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exit (1);
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}
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/* Address is inside the segment e.g. 0x2000 < addr < 0x4000. */
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addr = 0x3000;
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ret = _dl_addr_inside_object (&map, addr);
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switch (ret)
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{
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case 0:
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printf ("FAIL: Inside: Address is detected as outside the segment.\n");
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err++;
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break;
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case 1:
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printf ("PASS: Inside: Address is detected as inside the segment.\n");
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break;
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default:
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printf ("FAIL: Inside: Invalid return value.\n");
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exit (1);
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}
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/* Address is below the segment e.g. < 0x2000. */
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addr = 0x1000;
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ret = _dl_addr_inside_object (&map, addr);
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switch (ret)
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{
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case 0:
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printf ("PASS: Below: Address is detected as outside the segment.\n");
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break;
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case 1:
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printf ("FAIL: Below: Address is detected as inside the segment.\n");
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err++;
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break;
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default:
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printf ("FAIL: Below: Invalid return value.\n");
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exit (1);
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}
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/* Address is in the segment and addr == p_vaddr. */
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addr = 0x2000;
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ret = _dl_addr_inside_object (&map, addr);
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switch (ret)
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{
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case 0:
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printf ("FAIL: At p_vaddr: Address is detected as outside the segment.\n");
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err++;
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break;
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case 1:
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printf ("PASS: At p_vaddr: Address is detected as inside the segment.\n");
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break;
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default:
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printf ("FAIL: At p_vaddr: Invalid return value.\n");
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exit (1);
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}
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/* Address is in the segment and addr == p_vaddr + p_memsz - 1. */
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addr = 0x2000 + 0x2000 - 0x1;
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ret = _dl_addr_inside_object (&map, addr);
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switch (ret)
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{
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case 0:
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printf ("FAIL: At p_memsz-1: Address is detected as outside the segment.\n");
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err++;
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break;
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case 1:
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printf ("PASS: At p_memsz-1: Address is detected as inside the segment.\n");
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break;
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default:
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printf ("FAIL: At p_memsz-1: Invalid return value.\n");
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exit (1);
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}
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/* Address is outside the segment and addr == p_vaddr + p_memsz. */
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addr = 0x2000 + 0x2000;
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ret = _dl_addr_inside_object (&map, addr);
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switch (ret)
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{
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case 0:
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printf ("PASS: At p_memsz: Address is detected as outside the segment.\n");
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break;
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case 1:
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printf ("FAIL: At p_memsz: Address is detected as inside the segment.\n");
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err++;
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break;
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default:
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printf ("FAIL: At p_memsz: Invalid return value.\n");
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exit (1);
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}
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/* Address is outside the segment and p_vaddr at maximum address. */
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addr = 0x0 - 0x2;
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header.p_vaddr = 0x0 - 0x1;
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header.p_memsz = 0x1;
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ret = _dl_addr_inside_object (&map, addr);
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switch (ret)
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{
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case 0:
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printf ("PASS: At max: Address is detected as outside the segment.\n");
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break;
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case 1:
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printf ("FAIL: At max: Address is detected as inside the segment.\n");
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err++;
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break;
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default:
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printf ("FAIL: At max: Invalid return value.\n");
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exit (1);
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}
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/* Address is outside the segment and p_vaddr at minimum address. */
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addr = 0x1;
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header.p_vaddr = 0x0;
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header.p_memsz = 0x1;
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ret = _dl_addr_inside_object (&map, addr);
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switch (ret)
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{
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case 0:
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printf ("PASS: At min: Address is detected as outside the segment.\n");
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break;
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case 1:
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printf ("FAIL: At min: Address is detected as inside the segment.\n");
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err++;
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break;
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default:
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printf ("FAIL: At min: Invalid return value.\n");
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exit (1);
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}
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/* Address is always inside the segment with p_memsz at max. */
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addr = 0x0;
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header.p_vaddr = 0x0;
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header.p_memsz = 0x0 - 0x1;
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ret = _dl_addr_inside_object (&map, addr);
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switch (ret)
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{
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case 0:
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printf ("FAIL: At maxmem: Address is detected as outside the segment.\n");
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err++;
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break;
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case 1:
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printf ("PASS: At maxmem: Address is detected as inside the segment.\n");
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break;
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default:
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printf ("FAIL: At maxmem: Invalid return value.\n");
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exit (1);
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}
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/* Attempt to wrap addr into the segment.
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Pick a load address in the middle of the address space.
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Place the test address at 0x0 so it wraps to the middle again. */
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map.l_addr = 0x0 - 0x1;
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map.l_addr = map.l_addr / 2;
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addr = 0;
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/* Setup a segment covering 1/2 the address space. */
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header.p_vaddr = 0x0;
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header.p_memsz = 0x0 - 0x1 - map.l_addr;
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/* No matter where you place addr everything is shifted modulo l_addr
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and even with this underflow you're always 1 byte away from being
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in the range. */
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ret = _dl_addr_inside_object (&map, addr);
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switch (ret)
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{
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case 0:
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printf ("PASS: Underflow: Address is detected as outside the segment.\n");
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break;
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case 1:
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printf ("FAIL: Underflow: Address is detected as inside the segment.\n");
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err++;
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break;
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default:
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printf ("FAIL: Underflow: Invalid return value.\n");
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exit (1);
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}
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return err;
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}
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#define TEST_FUNCTION do_test ()
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#include "../test-skeleton.c"
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