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https://sourceware.org/git/glibc.git
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f91f1c0fb8
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.
364 lines
8.7 KiB
C
364 lines
8.7 KiB
C
/* Global object symbol access tests with a static executable (BZ #15022).
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Copyright (C) 2013 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 <dlfcn.h>
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#include <stddef.h>
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#include <stdio.h>
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#define MAGIC0 0
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#define MAGIC1 0x5500ffaa
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#define MAGIC2 0xaaff0055
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#define MAGIC3 0xff55aa00
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/* Check the ability to access the global symbol object and then
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global-scope symbol access consistency via different mappings
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requested from a static executable. */
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static int
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do_test (void)
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{
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unsigned int (*initial_getfoo) (void);
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void (*initial_setfoo) (unsigned int);
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unsigned int (*global_getfoo) (void);
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void (*global_setfoo) (unsigned int);
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unsigned int (*local_getfoo) (void);
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void (*local_setfoo) (unsigned int);
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unsigned int *initial_foop;
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unsigned int *global_foop;
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unsigned int *local_foop;
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void *initial_handle;
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void *global_handle;
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void *local_handle;
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unsigned int foo;
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/* Try to map self. */
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initial_handle = dlopen (NULL, RTLD_LAZY | RTLD_GLOBAL);
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if (initial_handle == NULL)
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{
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printf ("dlopen [initial] (NULL): %s\n", dlerror ());
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return 1;
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}
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/* Make sure symbol lookups fail gracefully. */
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initial_foop = dlsym (initial_handle, "foo");
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if (initial_foop != NULL)
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{
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printf ("dlsym [initial] (foo): got %p, expected NULL\n", initial_foop);
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return 1;
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}
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initial_getfoo = dlsym (initial_handle, "getfoo");
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if (initial_getfoo != NULL)
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{
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printf ("dlsym [initial] (getfoo): got %p, expected NULL\n",
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initial_getfoo);
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return 1;
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}
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initial_setfoo = dlsym (initial_handle, "setfoo");
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if (initial_setfoo != NULL)
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{
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printf ("dlsym [initial] (setfoo): got %p, expected NULL\n",
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initial_setfoo);
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return 1;
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}
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/* Try to map a module into the global scope. */
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global_handle = dlopen ("modstatic3.so", RTLD_LAZY | RTLD_GLOBAL);
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if (global_handle == NULL)
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{
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printf ("dlopen [global] (modstatic3.so): %s\n", dlerror ());
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return 1;
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}
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/* Get at its symbols. */
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global_foop = dlsym (global_handle, "foo");
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if (global_foop == NULL)
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{
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printf ("dlsym [global] (foo): %s\n", dlerror ());
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return 1;
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}
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global_getfoo = dlsym (global_handle, "getfoo");
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if (global_getfoo == NULL)
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{
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printf ("dlsym [global] (getfoo): %s\n", dlerror ());
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return 1;
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}
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global_setfoo = dlsym (global_handle, "setfoo");
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if (global_setfoo == NULL)
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{
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printf ("dlsym [global] (setfoo): %s\n", dlerror ());
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return 1;
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}
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/* Try to map self again now. */
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local_handle = dlopen (NULL, RTLD_LAZY | RTLD_LOCAL);
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if (local_handle == NULL)
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{
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printf ("dlopen [local] (NULL): %s\n", dlerror ());
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return 1;
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}
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/* Make sure we can get at the previously loaded module's symbols
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via this handle too. */
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local_foop = dlsym (local_handle, "foo");
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if (local_foop == NULL)
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{
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printf ("dlsym [local] (foo): %s\n", dlerror ());
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return 1;
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}
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local_getfoo = dlsym (local_handle, "getfoo");
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if (local_getfoo == NULL)
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{
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printf ("dlsym [local] (getfoo): %s\n", dlerror ());
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return 1;
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}
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local_setfoo = dlsym (local_handle, "setfoo");
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if (local_setfoo == NULL)
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{
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printf ("dlsym [local] (setfoo): %s\n", dlerror ());
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return 1;
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}
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/* Make sure we can get at the previously loaded module's symbols
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via a handle that was obtained before the module was loaded too. */
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initial_foop = dlsym (initial_handle, "foo");
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if (initial_foop == NULL)
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{
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printf ("dlsym [initial] (foo): %s\n", dlerror ());
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return 1;
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}
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initial_getfoo = dlsym (initial_handle, "getfoo");
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if (initial_getfoo == NULL)
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{
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printf ("dlsym [initial] (getfoo): %s\n", dlerror ());
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return 1;
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}
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initial_setfoo = dlsym (initial_handle, "setfoo");
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if (initial_setfoo == NULL)
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{
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printf ("dlsym [initial] (setfoo): %s\n", dlerror ());
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return 1;
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}
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/* Make sure the view of the initial state is consistent. */
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foo = *initial_foop;
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if (foo != MAGIC0)
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{
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printf ("*foop [initial]: got %#x, expected %#x\n", foo, MAGIC0);
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return 1;
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}
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foo = *global_foop;
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if (foo != MAGIC0)
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{
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printf ("*foop [global]: got %#x, expected %#x\n", foo, MAGIC0);
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return 1;
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}
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foo = *local_foop;
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if (foo != MAGIC0)
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{
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printf ("*foop [local]: got %#x, expected %#x\n", foo, MAGIC0);
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return 1;
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}
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foo = initial_getfoo ();
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if (foo != MAGIC0)
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{
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printf ("getfoo [initial]: got %#x, expected %#x\n", foo, MAGIC0);
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return 1;
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}
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foo = global_getfoo ();
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if (foo != MAGIC0)
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{
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printf ("getfoo [global]: got %#x, expected %#x\n", foo, MAGIC0);
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return 1;
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}
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foo = local_getfoo ();
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if (foo != MAGIC0)
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{
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printf ("getfoo [local]: got %#x, expected %#x\n", foo, MAGIC0);
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return 1;
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}
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/* Likewise with a change to its state made through the first handle. */
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initial_setfoo (MAGIC1);
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foo = *initial_foop;
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if (foo != MAGIC1)
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{
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printf ("*foop [initial]: got %#x, expected %#x\n", foo, MAGIC1);
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return 1;
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}
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foo = *global_foop;
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if (foo != MAGIC1)
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{
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printf ("*foop [global]: got %#x, expected %#x\n", foo, MAGIC1);
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return 1;
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}
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foo = *local_foop;
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if (foo != MAGIC1)
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{
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printf ("*foop [local]: got %#x, expected %#x\n", foo, MAGIC1);
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return 1;
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}
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foo = initial_getfoo ();
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if (foo != MAGIC1)
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{
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printf ("getfoo [initial]: got %#x, expected %#x\n", foo, MAGIC1);
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return 1;
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}
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foo = global_getfoo ();
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if (foo != MAGIC1)
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{
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printf ("getfoo [global]: got %#x, expected %#x\n", foo, MAGIC1);
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return 1;
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}
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foo = local_getfoo ();
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if (foo != MAGIC1)
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{
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printf ("getfoo [local]: got %#x, expected %#x\n", foo, MAGIC1);
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return 1;
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}
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/* Likewise with a change to its state made through the second handle. */
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global_setfoo (MAGIC2);
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foo = *initial_foop;
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if (foo != MAGIC2)
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{
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printf ("*foop [initial]: got %#x, expected %#x\n", foo, MAGIC2);
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return 1;
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}
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foo = *global_foop;
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if (foo != MAGIC2)
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{
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printf ("*foop [global]: got %#x, expected %#x\n", foo, MAGIC2);
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return 1;
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}
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foo = *local_foop;
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if (foo != MAGIC2)
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{
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printf ("*foop [local]: got %#x, expected %#x\n", foo, MAGIC2);
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return 1;
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}
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foo = initial_getfoo ();
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if (foo != MAGIC2)
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{
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printf ("getfoo [initial]: got %#x, expected %#x\n", foo, MAGIC2);
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return 1;
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}
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foo = global_getfoo ();
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if (foo != MAGIC2)
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{
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printf ("getfoo [global]: got %#x, expected %#x\n", foo, MAGIC2);
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return 1;
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}
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foo = local_getfoo ();
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if (foo != MAGIC2)
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{
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printf ("getfoo [local]: got %#x, expected %#x\n", foo, MAGIC2);
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return 1;
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}
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/* Likewise with a change to its state made through the third handle. */
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local_setfoo (MAGIC3);
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foo = *initial_foop;
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if (foo != MAGIC3)
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{
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printf ("*foop [initial]: got %#x, expected %#x\n", foo, MAGIC3);
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return 1;
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}
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foo = *global_foop;
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if (foo != MAGIC3)
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{
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printf ("*foop [global]: got %#x, expected %#x\n", foo, MAGIC3);
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return 1;
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}
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foo = *local_foop;
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if (foo != MAGIC3)
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{
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printf ("*foop [local]: got %#x, expected %#x\n", foo, MAGIC3);
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return 1;
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}
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foo = initial_getfoo ();
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if (foo != MAGIC3)
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{
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printf ("getfoo [initial]: got %#x, expected %#x\n", foo, MAGIC3);
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return 1;
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}
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foo = global_getfoo ();
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if (foo != MAGIC3)
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{
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printf ("getfoo [global]: got %#x, expected %#x\n", foo, MAGIC3);
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return 1;
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}
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foo = local_getfoo ();
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if (foo != MAGIC3)
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{
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printf ("getfoo [local]: got %#x, expected %#x\n", foo, MAGIC3);
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return 1;
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}
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/* All done, clean up. */
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initial_getfoo = NULL;
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initial_setfoo = NULL;
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initial_foop = NULL;
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local_getfoo = NULL;
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local_setfoo = NULL;
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local_foop = NULL;
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dlclose (local_handle);
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global_getfoo = NULL;
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global_setfoo = NULL;
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global_foop = NULL;
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dlclose (global_handle);
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dlclose (initial_handle);
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return 0;
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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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