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/* Basic tests for _dl_find_object.
Copyright (C) 2021-2025 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 <dl-find_object.h>
#include <dlfcn.h>
#include <gnu/lib-names.h>
#include <ldsodefs.h>
#include <link.h>
#include <stdio.h>
#include <support/check.h>
#include <support/xdlfcn.h>
/* Use data objects for testing, so that it is not necessary to decode
function descriptors on architectures that have them. */
static char main_program_data;
/* Computes the expected _dl_find_object result directly from the
map. */
static void
from_map (struct link_map *l, struct dl_find_object *expected)
{
struct dl_find_object_internal internal;
_dl_find_object_from_map (l, &internal);
_dl_find_object_to_external (&internal, expected);
}
/* Compare _dl_find_object result at ADDRESS with *EXPECTED. */
static void
check (void *address,
struct dl_find_object *expected, int line)
{
struct dl_find_object actual;
int ret = _dl_find_object (address, &actual);
if (expected == NULL)
{
if (ret != -1)
{
support_record_failure ();
printf ("%s:%d: unexpected success for %p\n",
__FILE__, line, address);
}
return;
}
if (ret != 0)
{
support_record_failure ();
printf ("%s:%d: unexpected failure for %p\n",
__FILE__, line, address);
return;
}
if (actual.dlfo_flags != expected->dlfo_flags)
{
support_record_failure ();
printf ("%s:%d: error: %p: flags is %llu, expected %llu\n",
__FILE__, line, address,
actual.dlfo_flags, expected->dlfo_flags);
}
if (expected->dlfo_link_map->l_contiguous)
{
/* If the mappings are not contiguous, the actual and execpted
mappings may differ, so this subtest will not work. */
if (actual.dlfo_flags != expected->dlfo_flags)
{
support_record_failure ();
printf ("%s:%d: error: %p: map start is %p, expected %p\n",
__FILE__, line,
address, actual.dlfo_map_start, expected->dlfo_map_start);
}
if (actual.dlfo_map_end != expected->dlfo_map_end)
{
support_record_failure ();
printf ("%s:%d: error: %p: map end is %p, expected %p\n",
__FILE__, line,
address, actual.dlfo_map_end, expected->dlfo_map_end);
}
}
if (actual.dlfo_link_map != expected->dlfo_link_map)
{
support_record_failure ();
printf ("%s:%d: error: %p: link map is %p, expected %p\n",
__FILE__, line,
address, actual.dlfo_link_map, expected->dlfo_link_map);
}
if (actual.dlfo_eh_frame != expected->dlfo_eh_frame)
{
support_record_failure ();
printf ("%s:%d: error: %p: EH frame is %p, expected %p\n",
__FILE__, line,
address, actual.dlfo_eh_frame, expected->dlfo_eh_frame);
}
#if DLFO_STRUCT_HAS_EH_DBASE
if (actual.dlfo_eh_dbase != expected->dlfo_eh_dbase)
{
support_record_failure ();
printf ("%s:%d: error: %p: data base is %p, expected %p\n",
__FILE__, line,
address, actual.dlfo_eh_dbase, expected->dlfo_eh_dbase);
}
#endif
#if DLFO_STRUCT_HAS_EH_COUNT
if (actual.dlfo_eh_count != expected->dlfo_eh_count)
{
support_record_failure ();
printf ("%s:%d: error: %p: count is %d, expected %d\n",
__FILE__, line,
address, actual.dlfo_eh_count, expected->dlfo_eh_count);
}
#endif
}
/* Check that unwind data for the main executable and the dynamic
linker can be found. */
static void
check_initial (void)
{
#ifndef FOR_STATIC
/* Avoid direct reference, which could lead to copy relocations. */
struct r_debug *debug = xdlsym (NULL, "_r_debug");
TEST_VERIFY_EXIT (debug != NULL);
char **tzname = xdlsym (NULL, "tzname");
/* The main executable has an unnamed link map. */
struct link_map *main_map = (struct link_map *) debug->r_map;
TEST_COMPARE_STRING (main_map->l_name, "");
/* The link map of the dynamic linker. */
struct link_map *rtld_map = xdlopen (LD_SO, RTLD_LAZY | RTLD_NOLOAD);
TEST_VERIFY_EXIT (rtld_map != NULL);
/* The link map of libc.so. */
struct link_map *libc_map = xdlopen (LIBC_SO, RTLD_LAZY | RTLD_NOLOAD);
TEST_VERIFY_EXIT (libc_map != NULL);
struct dl_find_object expected;
/* Data in the main program. */
from_map (main_map, &expected);
check (&main_program_data, &expected, __LINE__);
/* Corner cases for the mapping. */
check ((void *) main_map->l_map_start, &expected, __LINE__);
check ((void *) (main_map->l_map_end - 1), &expected, __LINE__);
/* Data in the dynamic loader. */
from_map (rtld_map, &expected);
check (debug, &expected, __LINE__);
check ((void *) rtld_map->l_map_start, &expected, __LINE__);
check ((void *) (rtld_map->l_map_end - 1), &expected, __LINE__);
/* Data in libc. */
from_map (libc_map, &expected);
check (tzname, &expected, __LINE__);
check ((void *) libc_map->l_map_start, &expected, __LINE__);
check ((void *) (libc_map->l_map_end - 1), &expected, __LINE__);
#endif
}
static int
do_test (void)
{
{
struct dl_find_object dlfo = { };
int ret = _dl_find_object (&main_program_data, &dlfo);
printf ("info: main program unwind data: %p (%d)\n",
dlfo.dlfo_eh_frame, ret);
TEST_COMPARE (ret, 0);
TEST_VERIFY (dlfo.dlfo_eh_frame != NULL);
}
check_initial ();
/* dlopen-based test. First an object that can be dlclosed. */
struct link_map *mod1 = xdlopen ("tst-dl_find_object-mod1.so", RTLD_NOW);
void *mod1_data = xdlsym (mod1, "mod1_data");
void *map_start = (void *) mod1->l_map_start;
void *map_end = (void *) (mod1->l_map_end - 1);
check_initial ();
struct dl_find_object expected;
from_map (mod1, &expected);
check (mod1_data, &expected, __LINE__);
check (map_start, &expected, __LINE__);
check (map_end, &expected, __LINE__);
/* Unloading must make the data unavailable. */
xdlclose (mod1);
check_initial ();
check (mod1_data, NULL, __LINE__);
check (map_start, NULL, __LINE__);
check (map_end, NULL, __LINE__);
/* Now try a NODELETE load. */
struct link_map *mod2 = xdlopen ("tst-dl_find_object-mod2.so", RTLD_NOW);
void *mod2_data = xdlsym (mod2, "mod2_data");
map_start = (void *) mod2->l_map_start;
map_end = (void *) (mod2->l_map_end - 1);
check_initial ();
from_map (mod2, &expected);
check (mod2_data, &expected, __LINE__);
check (map_start, &expected, __LINE__);
check (map_end, &expected, __LINE__);
dlclose (mod2); /* Does nothing due to NODELETE. */
check_initial ();
check (mod2_data, &expected, __LINE__);
check (map_start, &expected, __LINE__);
check (map_end, &expected, __LINE__);
/* Now load again the first module. */
mod1 = xdlopen ("tst-dl_find_object-mod1.so", RTLD_NOW);
mod1_data = xdlsym (mod1, "mod1_data");
map_start = (void *) mod1->l_map_start;
map_end = (void *) (mod1->l_map_end - 1);
check_initial ();
from_map (mod1, &expected);
check (mod1_data, &expected, __LINE__);
check (map_start, &expected, __LINE__);
check (map_end, &expected, __LINE__);
/* Check that _dl_find_object works from a shared object (mostly for
static dlopen). */
__typeof (_dl_find_object) *find_object
= *(void **) xdlsym (mod2, "find_object");
struct dl_find_object actual;
TEST_COMPARE (find_object (&main_program_data, &actual), 0);
check (&main_program_data, &actual, __LINE__); /* Reversed check. */
return 0;
}
#include <support/test-driver.c>
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