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/* Check that the entire libc.so program image is readable if contiguous.
Copyright (C) 2025 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<https://www.gnu.org/licenses/>. */
#include <gnu/lib-names.h>
#include <link.h>
#include <support/check.h>
#include <support/xdlfcn.h>
#include <support/xunistd.h>
#include <sys/mman.h>
#include <unistd.h>
static int
do_test (void)
{
struct link_map *l = xdlopen (LIBC_SO, RTLD_NOW);
/* The dynamic loader fills holes with PROT_NONE mappings. */
if (!l->l_contiguous)
FAIL_EXIT1 ("libc.so link map is not contiguous");
/* Direct probing does not work because not everything is readable
due to PROT_NONE mappings. */
int pagesize = getpagesize ();
ElfW(Addr) addr = l->l_map_start;
TEST_COMPARE (addr % pagesize, 0);
while (addr < l->l_map_end)
{
void *expected = (void *) addr;
void *ptr = xmmap (expected, 1, PROT_READ | PROT_WRITE,
MAP_PRIVATE | MAP_ANONYMOUS, -1);
if (ptr == expected)
FAIL ("hole in libc.so memory image after %lu bytes",
(unsigned long int) (addr - l->l_map_start));
xmunmap (ptr, 1);
addr += pagesize;
}
xdlclose (l);
return 0;
}
#include <support/test-driver.c>
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