mirror of git://sourceware.org/git/glibc.git
99 lines
3.0 KiB
C
99 lines
3.0 KiB
C
/* Check that _dl_find_object behavior matches up with gaps.
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Copyright (C) 2025 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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<https://www.gnu.org/licenses/>. */
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#include <dlfcn.h>
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#include <gnu/lib-names.h>
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#include <link.h>
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#include <stdbool.h>
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#include <stdio.h>
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#include <support/check.h>
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#include <support/xdlfcn.h>
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#include <support/xunistd.h>
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#include <sys/mman.h>
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#include <unistd.h>
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static int
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do_test (void)
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{
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struct link_map *l = xdlopen (LD_SO, RTLD_NOW);
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if (!l->l_contiguous)
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{
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puts ("info: ld.so link map is not contiguous");
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/* Try to find holes by probing with mmap. */
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int pagesize = getpagesize ();
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bool gap_found = false;
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ElfW(Addr) addr = l->l_map_start;
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TEST_COMPARE (addr % pagesize, 0);
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while (addr < l->l_map_end)
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{
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void *expected = (void *) addr;
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void *ptr = xmmap (expected, 1, PROT_READ | PROT_WRITE,
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MAP_PRIVATE | MAP_ANONYMOUS, -1);
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struct dl_find_object dlfo;
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int dlfo_ret = _dl_find_object (expected, &dlfo);
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if (ptr == expected)
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{
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if (dlfo_ret < 0)
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{
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TEST_COMPARE (dlfo_ret, -1);
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printf ("info: hole without mapping data found at %p\n", ptr);
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}
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else
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FAIL ("object \"%s\" found in gap at %p",
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dlfo.dlfo_link_map->l_name, ptr);
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gap_found = true;
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}
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else if (dlfo_ret == 0)
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{
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if ((void *) dlfo.dlfo_link_map != (void *) l)
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{
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printf ("info: object \"%s\" found at %p\n",
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dlfo.dlfo_link_map->l_name, ptr);
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gap_found = true;
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}
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}
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else
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TEST_COMPARE (dlfo_ret, -1);
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xmunmap (ptr, 1);
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addr += pagesize;
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}
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if (!gap_found)
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FAIL ("no ld.so gap found");
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}
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else
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{
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puts ("info: ld.so link map is contiguous");
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/* Assert that ld.so is truly contiguous in memory. */
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volatile long int *p = (volatile long int *) l->l_map_start;
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volatile long int *end = (volatile long int *) l->l_map_end;
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while (p < end)
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{
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*p;
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++p;
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}
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}
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xdlclose (l);
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return 0;
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}
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#include <support/test-driver.c>
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