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authorMaciej W. Rozycki <macro@codesourcery.com>2013-06-28 16:20:26 +0100
committerMaciej W. Rozycki <macro@codesourcery.com>2013-06-28 16:22:20 +0100
commitf91f1c0fb89056995f1c9c6a06c361efdf5139e7 (patch)
tree67db98c499e8dbd72bc5b49e654706d375384c0f /dlfcn/tststatic4.c
parented0257f7d3378ec4a72e297f0dcba5159f2dd138 (diff)
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[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.
Diffstat (limited to 'dlfcn/tststatic4.c')
-rw-r--r--dlfcn/tststatic4.c363
1 files changed, 363 insertions, 0 deletions
diff --git a/dlfcn/tststatic4.c b/dlfcn/tststatic4.c
new file mode 100644
index 0000000..f6078e0
--- /dev/null
+++ b/dlfcn/tststatic4.c
@@ -0,0 +1,363 @@
+/* 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"