1 files changed, 51 insertions, 0 deletions
diff --git a/elf/tst-auditmod22.c b/elf/tst-auditmod22.c
new file mode 100644
index 0000000000..8e05ce8cbb
--- /dev/null
+++ b/elf/tst-auditmod22.c
@@ -0,0 +1,51 @@
+/* Check DTAUDIT and vDSO interaction.
+   Copyright (C) 2021 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/>.  */
+
+#include <link.h>
+#include <inttypes.h>
+#include <stdbool.h>
+#include <string.h>
+#include <stdio.h>
+#include <sys/auxv.h>
+
+static inline bool
+startswith (const char *str, const char *pre)
+{
+  size_t lenpre = strlen (pre);
+  size_t lenstr = strlen (str);
+  return lenstr < lenpre ? false : memcmp (pre, str, lenpre) == 0;
+}
+
+unsigned int
+la_version (unsigned int version)
+{
+  return LAV_CURRENT;
+}
+
+unsigned int
+la_objopen (struct link_map *map, Lmid_t lmid, uintptr_t *cookie)
+{
+  /* The linux-gate.so is placed at a fixed address, thus l_addr being 0,
+     and it might be the value reported as the AT_SYSINFO_EHDR.  */
+  if (map->l_addr == 0 && startswith (map->l_name, "linux-gate.so"))
+    fprintf (stderr, "vdso found: %p\n", NULL);
+  else if (map->l_addr == getauxval (AT_SYSINFO_EHDR))
+    fprintf (stderr, "vdso found: %p\n", (void*) map->l_addr);
+
+  return 0;
+}