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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/tststatic3.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/tststatic3.c')
-rw-r--r--dlfcn/tststatic3.c128
1 files changed, 128 insertions, 0 deletions
diff --git a/dlfcn/tststatic3.c b/dlfcn/tststatic3.c
new file mode 100644
index 0000000000..8a3421e80c
--- /dev/null
+++ b/dlfcn/tststatic3.c
@@ -0,0 +1,128 @@
+/* Global-scope DSO mapping test 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
+
+/* Mapping a DSO into the global scope used to crash in static
+ executables. Check that it succeeds and then that symbols from
+ the DSO can be accessed and operate as expected. */
+static int
+do_test (void)
+{
+ unsigned int (*getfoo) (void);
+ void (*setfoo) (unsigned int);
+ unsigned int *foop;
+ unsigned int foo;
+ void *handle;
+
+ /* Try to map a module into the global scope. */
+ handle = dlopen ("modstatic3.so", RTLD_LAZY | RTLD_GLOBAL);
+ if (handle == NULL)
+ {
+ printf ("dlopen (modstatic3.so): %s\n", dlerror ());
+ return 1;
+ }
+
+ /* Get at its symbols. */
+ foop = dlsym (handle, "foo");
+ if (foop == NULL)
+ {
+ printf ("dlsym (foo): %s\n", dlerror ());
+ return 1;
+ }
+
+ getfoo = dlsym (handle, "getfoo");
+ if (getfoo == NULL)
+ {
+ printf ("dlsym (getfoo): %s\n", dlerror ());
+ return 1;
+ }
+
+ setfoo = dlsym (handle, "setfoo");
+ if (setfoo == NULL)
+ {
+ printf ("dlsym (setfoo): %s\n", dlerror ());
+ return 1;
+ }
+
+ /* Make sure the view of the initial state is consistent. */
+ foo = *foop;
+ if (foo != MAGIC0)
+ {
+ printf ("*foop: got %#x, expected %#x\n", foo, MAGIC0);
+ return 1;
+ }
+
+ foo = getfoo ();
+ if (foo != MAGIC0)
+ {
+ printf ("getfoo: got %#x, expected %#x\n", foo, MAGIC0);
+ return 1;
+ }
+
+ /* Likewise with one change to its state. */
+ setfoo (MAGIC1);
+
+ foo = *foop;
+ if (foo != MAGIC1)
+ {
+ printf ("*foop: got %#x, expected %#x\n", foo, MAGIC1);
+ return 1;
+ }
+
+ foo = getfoo ();
+ if (foo != MAGIC1)
+ {
+ printf ("getfoo: got %#x, expected %#x\n", foo, MAGIC1);
+ return 1;
+ }
+
+ /* And with another. */
+ setfoo (MAGIC2);
+
+ foo = *foop;
+ if (foo != MAGIC2)
+ {
+ printf ("*foop: got %#x, expected %#x\n", foo, MAGIC2);
+ return 1;
+ }
+
+ foo = getfoo ();
+ if (foo != MAGIC2)
+ {
+ printf ("getfoo: got %#x, expected %#x\n", foo, MAGIC2);
+ return 1;
+ }
+
+ /* All done, clean up. */
+ getfoo = NULL;
+ setfoo = NULL;
+ foop = NULL;
+ dlclose (handle);
+
+ return 0;
+}
+
+#define TEST_FUNCTION do_test ()
+#include "../test-skeleton.c"