glibc/dlfcn/tststatic4.c
Maciej W. Rozycki f91f1c0fb8 [BZ #15022] Correct global-scope dlopen issues in static executables.
This change creates a link map in static executables to serve as the
global search list for dlopen.  It fixes a problem with the inability
to access the global symbol object and a crash on an attempt to map a
DSO into the global scope.  Some code that has become dead after the
addition of this link map is removed too and test cases are provided.
2013-06-28 16:22:20 +01:00

364 lines
8.7 KiB
C

/* Global object symbol access tests with a static executable (BZ #15022).
Copyright (C) 2013 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
<http://www.gnu.org/licenses/>. */
#include <dlfcn.h>
#include <stddef.h>
#include <stdio.h>
#define MAGIC0 0
#define MAGIC1 0x5500ffaa
#define MAGIC2 0xaaff0055
#define MAGIC3 0xff55aa00
/* Check the ability to access the global symbol object and then
global-scope symbol access consistency via different mappings
requested from a static executable. */
static int
do_test (void)
{
unsigned int (*initial_getfoo) (void);
void (*initial_setfoo) (unsigned int);
unsigned int (*global_getfoo) (void);
void (*global_setfoo) (unsigned int);
unsigned int (*local_getfoo) (void);
void (*local_setfoo) (unsigned int);
unsigned int *initial_foop;
unsigned int *global_foop;
unsigned int *local_foop;
void *initial_handle;
void *global_handle;
void *local_handle;
unsigned int foo;
/* Try to map self. */
initial_handle = dlopen (NULL, RTLD_LAZY | RTLD_GLOBAL);
if (initial_handle == NULL)
{
printf ("dlopen [initial] (NULL): %s\n", dlerror ());
return 1;
}
/* Make sure symbol lookups fail gracefully. */
initial_foop = dlsym (initial_handle, "foo");
if (initial_foop != NULL)
{
printf ("dlsym [initial] (foo): got %p, expected NULL\n", initial_foop);
return 1;
}
initial_getfoo = dlsym (initial_handle, "getfoo");
if (initial_getfoo != NULL)
{
printf ("dlsym [initial] (getfoo): got %p, expected NULL\n",
initial_getfoo);
return 1;
}
initial_setfoo = dlsym (initial_handle, "setfoo");
if (initial_setfoo != NULL)
{
printf ("dlsym [initial] (setfoo): got %p, expected NULL\n",
initial_setfoo);
return 1;
}
/* Try to map a module into the global scope. */
global_handle = dlopen ("modstatic3.so", RTLD_LAZY | RTLD_GLOBAL);
if (global_handle == NULL)
{
printf ("dlopen [global] (modstatic3.so): %s\n", dlerror ());
return 1;
}
/* Get at its symbols. */
global_foop = dlsym (global_handle, "foo");
if (global_foop == NULL)
{
printf ("dlsym [global] (foo): %s\n", dlerror ());
return 1;
}
global_getfoo = dlsym (global_handle, "getfoo");
if (global_getfoo == NULL)
{
printf ("dlsym [global] (getfoo): %s\n", dlerror ());
return 1;
}
global_setfoo = dlsym (global_handle, "setfoo");
if (global_setfoo == NULL)
{
printf ("dlsym [global] (setfoo): %s\n", dlerror ());
return 1;
}
/* Try to map self again now. */
local_handle = dlopen (NULL, RTLD_LAZY | RTLD_LOCAL);
if (local_handle == NULL)
{
printf ("dlopen [local] (NULL): %s\n", dlerror ());
return 1;
}
/* Make sure we can get at the previously loaded module's symbols
via this handle too. */
local_foop = dlsym (local_handle, "foo");
if (local_foop == NULL)
{
printf ("dlsym [local] (foo): %s\n", dlerror ());
return 1;
}
local_getfoo = dlsym (local_handle, "getfoo");
if (local_getfoo == NULL)
{
printf ("dlsym [local] (getfoo): %s\n", dlerror ());
return 1;
}
local_setfoo = dlsym (local_handle, "setfoo");
if (local_setfoo == NULL)
{
printf ("dlsym [local] (setfoo): %s\n", dlerror ());
return 1;
}
/* Make sure we can get at the previously loaded module's symbols
via a handle that was obtained before the module was loaded too. */
initial_foop = dlsym (initial_handle, "foo");
if (initial_foop == NULL)
{
printf ("dlsym [initial] (foo): %s\n", dlerror ());
return 1;
}
initial_getfoo = dlsym (initial_handle, "getfoo");
if (initial_getfoo == NULL)
{
printf ("dlsym [initial] (getfoo): %s\n", dlerror ());
return 1;
}
initial_setfoo = dlsym (initial_handle, "setfoo");
if (initial_setfoo == NULL)
{
printf ("dlsym [initial] (setfoo): %s\n", dlerror ());
return 1;
}
/* Make sure the view of the initial state is consistent. */
foo = *initial_foop;
if (foo != MAGIC0)
{
printf ("*foop [initial]: got %#x, expected %#x\n", foo, MAGIC0);
return 1;
}
foo = *global_foop;
if (foo != MAGIC0)
{
printf ("*foop [global]: got %#x, expected %#x\n", foo, MAGIC0);
return 1;
}
foo = *local_foop;
if (foo != MAGIC0)
{
printf ("*foop [local]: got %#x, expected %#x\n", foo, MAGIC0);
return 1;
}
foo = initial_getfoo ();
if (foo != MAGIC0)
{
printf ("getfoo [initial]: got %#x, expected %#x\n", foo, MAGIC0);
return 1;
}
foo = global_getfoo ();
if (foo != MAGIC0)
{
printf ("getfoo [global]: got %#x, expected %#x\n", foo, MAGIC0);
return 1;
}
foo = local_getfoo ();
if (foo != MAGIC0)
{
printf ("getfoo [local]: got %#x, expected %#x\n", foo, MAGIC0);
return 1;
}
/* Likewise with a change to its state made through the first handle. */
initial_setfoo (MAGIC1);
foo = *initial_foop;
if (foo != MAGIC1)
{
printf ("*foop [initial]: got %#x, expected %#x\n", foo, MAGIC1);
return 1;
}
foo = *global_foop;
if (foo != MAGIC1)
{
printf ("*foop [global]: got %#x, expected %#x\n", foo, MAGIC1);
return 1;
}
foo = *local_foop;
if (foo != MAGIC1)
{
printf ("*foop [local]: got %#x, expected %#x\n", foo, MAGIC1);
return 1;
}
foo = initial_getfoo ();
if (foo != MAGIC1)
{
printf ("getfoo [initial]: got %#x, expected %#x\n", foo, MAGIC1);
return 1;
}
foo = global_getfoo ();
if (foo != MAGIC1)
{
printf ("getfoo [global]: got %#x, expected %#x\n", foo, MAGIC1);
return 1;
}
foo = local_getfoo ();
if (foo != MAGIC1)
{
printf ("getfoo [local]: got %#x, expected %#x\n", foo, MAGIC1);
return 1;
}
/* Likewise with a change to its state made through the second handle. */
global_setfoo (MAGIC2);
foo = *initial_foop;
if (foo != MAGIC2)
{
printf ("*foop [initial]: got %#x, expected %#x\n", foo, MAGIC2);
return 1;
}
foo = *global_foop;
if (foo != MAGIC2)
{
printf ("*foop [global]: got %#x, expected %#x\n", foo, MAGIC2);
return 1;
}
foo = *local_foop;
if (foo != MAGIC2)
{
printf ("*foop [local]: got %#x, expected %#x\n", foo, MAGIC2);
return 1;
}
foo = initial_getfoo ();
if (foo != MAGIC2)
{
printf ("getfoo [initial]: got %#x, expected %#x\n", foo, MAGIC2);
return 1;
}
foo = global_getfoo ();
if (foo != MAGIC2)
{
printf ("getfoo [global]: got %#x, expected %#x\n", foo, MAGIC2);
return 1;
}
foo = local_getfoo ();
if (foo != MAGIC2)
{
printf ("getfoo [local]: got %#x, expected %#x\n", foo, MAGIC2);
return 1;
}
/* Likewise with a change to its state made through the third handle. */
local_setfoo (MAGIC3);
foo = *initial_foop;
if (foo != MAGIC3)
{
printf ("*foop [initial]: got %#x, expected %#x\n", foo, MAGIC3);
return 1;
}
foo = *global_foop;
if (foo != MAGIC3)
{
printf ("*foop [global]: got %#x, expected %#x\n", foo, MAGIC3);
return 1;
}
foo = *local_foop;
if (foo != MAGIC3)
{
printf ("*foop [local]: got %#x, expected %#x\n", foo, MAGIC3);
return 1;
}
foo = initial_getfoo ();
if (foo != MAGIC3)
{
printf ("getfoo [initial]: got %#x, expected %#x\n", foo, MAGIC3);
return 1;
}
foo = global_getfoo ();
if (foo != MAGIC3)
{
printf ("getfoo [global]: got %#x, expected %#x\n", foo, MAGIC3);
return 1;
}
foo = local_getfoo ();
if (foo != MAGIC3)
{
printf ("getfoo [local]: got %#x, expected %#x\n", foo, MAGIC3);
return 1;
}
/* All done, clean up. */
initial_getfoo = NULL;
initial_setfoo = NULL;
initial_foop = NULL;
local_getfoo = NULL;
local_setfoo = NULL;
local_foop = NULL;
dlclose (local_handle);
global_getfoo = NULL;
global_setfoo = NULL;
global_foop = NULL;
dlclose (global_handle);
dlclose (initial_handle);
return 0;
}
#define TEST_FUNCTION do_test ()
#include "../test-skeleton.c"