Properly initialize audit cookie for the dynamic loader [BZ #25157]

The l_audit array is indexed by audit module, not audit function.

Change-Id: I180eb3573dc1c57433750f5d8cb18271460ba5f2

1 files changed, 64 insertions, 0 deletions

diff --git a/elf/tst-auditmanymod.h b/elf/tst-auditmanymod.h
new file mode 100644
index 0000000000..d1d89e0843
--- /dev/null
+++ b/elf/tst-auditmanymod.h
@@ -0,0 +1,64 @@
+/* Check cookie initialization for many auditors.  Auditor template.
+   Copyright (C) 2019 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
+   <https://www.gnu.org/licenses/>.  */
+
+/* The macro MOD must be defined to the number of this auditor (an
+   integer) before including this file.  */
+
+#include <link.h>
+#include <stdio.h>
+#include <unistd.h>
+
+/* Error counter for delayed error reporting.  */
+static int errors;
+
+unsigned int
+la_version (unsigned int version)
+{
+  return version;
+}
+
+unsigned int
+la_objopen (struct link_map *map, Lmid_t lmid,
+            uintptr_t *cookie)
+{
+  struct link_map *cookie_map = (struct link_map *) *cookie;
+  printf ("info: %d, la_objopen: map=%p name=%s cookie=%p:%p diff=%td\n",
+          MOD, map, map->l_name, cookie, cookie_map,
+          (char *) cookie - (char *) map);
+  fflush (stdout);
+  if (map != cookie_map)
+    {
+      printf ("error: %d, la_objopen:"
+              " map address does not match cookie value\n",
+              MOD);
+      fflush (stdout);
+      ++errors;
+    }
+  return 0;
+}
+
+extern unsigned int
+la_objclose (uintptr_t *__cookie)
+{
+  if (errors != 0)
+    {
+      printf ("error: exiting due to previous errors");
+      _exit (1);
+    }
+  return 0;
+}