ld.so: Add original DSO name if overridden by audit module [BZ #18251]

	* elf/dl-load.c (_dl_map_object_from_fd): Add additional parameter
	for original name of the DSO.  Add it to the name list of the DSO
	if it is actually given.
	(_dl_map_object): Keep track of whether an audit module rewrote
	the file name.  If yes, pass the original name to
	_dl_map_object_from_fd in a new parameter, otherwise NULL.  When
	debugging is enabled, log the change of the file name.
	* sysdeps/mach/hur/dl-sysdep.c: Adjust commented-out call to
	_dl_map_object_from_fd.
	* elf/Makefile: Build and run tst-audit11 and tst-audit12.
	* elf/tst-audit11.c: New file
	* elf/tst-auditmod11.c: New file.
	* elf/tst-audit11mod1.c: New file.
	* elf/tst-audit11mod2.c: New file.
	* elf/tst-audit11mod2.map: New file.
	* elf/tst-audit12.c: New file
	* elf/tst-auditmod12.c: New file.
	* elf/tst-audit12mod1.c: New file.
	* elf/tst-audit12mod2.c: New file.
	* elf/tst-audit12mod2.map: New file.
	* elf/tst-audit12mod3.c: New file.

1 files changed, 43 insertions, 0 deletions

diff --git a/elf/tst-auditmod12.c b/elf/tst-auditmod12.c
new file mode 100644
index 0000000000..0c532bd518
--- /dev/null
+++ b/elf/tst-auditmod12.c
@@ -0,0 +1,43 @@
+/* Audit module for tst-audit12.
+   Copyright (C) 2015 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 <link.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+
+unsigned int
+la_version (unsigned int version)
+{
+  return version;
+}
+
+char *
+la_objsearch (const char *name, uintptr_t *cookie, unsigned int flag)
+{
+  const char target[] = "tst-audit12mod2.so";
+
+  size_t namelen = strlen (name);
+  if (namelen >= sizeof (target) - 1
+      && strcmp (name + namelen - (sizeof (target) - 1), target) == 0)
+    {
+      return (char *) "$ORIGIN/tst-audit12mod3.so";
+    }
+  return (char *) name;
+}