[BZ #15897] dlfcn: do not mark dlopen/dlclose as leaf functions

Since the dlopen funcs might invoke a constructor that calls a func
that is in the same compilation unit as the caller, we cannot mark
them as leaf funcs.

Similarly, dlclose might invoke a destructor that calls a func that
is in the same compilation unit as the caller.

URL: https://sourceware.org/bugzilla/show_bug.cgi?id=15897
Reportedy-by: Fabrice Bauzac <libnoon@gmail.com>
Signed-off-by: Mike Frysinger <vapier@gentoo.org>

1 files changed, 35 insertions, 0 deletions

diff --git a/dlfcn/bug-dl-leaf-lib-cb.c b/dlfcn/bug-dl-leaf-lib-cb.c
new file mode 100644
index 0000000000..e028c047a5
--- /dev/null
+++ b/dlfcn/bug-dl-leaf-lib-cb.c
@@ -0,0 +1,35 @@
+/* Make sure dlopen/dlclose are not marked as leaf functions.
+   See bug-dl-leaf-lib.c for details.
+
+   Copyright (C) 2013 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+   Contributed by Mike Frysinger <vapier@gentoo.org>
+
+   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/>.  */
+
+extern void check_val_init (void);
+extern void check_val_fini (void);
+
+__attribute__ ((__constructor__))
+void construct (void)
+{
+  check_val_init ();
+}
+
+__attribute__ ((__destructor__))
+void destruct (void)
+{
+  check_val_fini ();
+}