commit 7b5bfe77836442b9aeb75cc520f0d1eb7f82be67
Author: Florian Weimer <fweimer@redhat.com>
Date:   Mon May 18 15:21:04 2020 +0200

    elf: Assert that objects are relocated before their constructors run
    
    If we try to run constructors before relocation, this is always
    a dynamic linker bug.  An assert is easier to notice than a call
    via an invalid function pointer (which may not even produce a valid
    call stack).
    
    Reviewed-by: Carlos O'Donell <carlos@redhat.com>

diff --git a/elf/dl-init.c b/elf/dl-init.c
index 45405cd0563845b4..99ce531d7b326f5f 100644
--- a/elf/dl-init.c
+++ b/elf/dl-init.c
@@ -16,6 +16,7 @@
    License along with the GNU C Library; if not, see
    <http://www.gnu.org/licenses/>.  */
 
+#include <assert.h>
 #include <stddef.h>
 #include <ldsodefs.h>
 
@@ -27,6 +28,11 @@ typedef void (*init_t) (int, char **, char **);
 static void
 call_init (struct link_map *l, int argc, char **argv, char **env)
 {
+  /* If the object has not been relocated, this is a bug.  The
+     function pointers are invalid in this case.  (Executables do not
+     need relocation, and neither do proxy objects.)  */
+  assert (l->l_real->l_relocated || l->l_real->l_type == lt_executable);
+
   if (l->l_init_called)
     /* This object is all done.  */
     return;