commit TBD
Author: Florian Weimer <fweimer@redhat.com>
Date:   Fri May 19 17:46:47 2017 +0200

    rtld: Completely ignore LD_LIBRARY_PATH for AT_SECURE=1 programs

LD_LIBRARY_PATH can only be used to reorder system search paths, which
is not useful functionality.

Index: glibc-2.17-c758a686/elf/rtld.c
===================================================================
--- glibc-2.17-c758a686.orig/elf/rtld.c
+++ glibc-2.17-c758a686/elf/rtld.c
@@ -2580,7 +2701,8 @@ process_envvars (enum mode *modep)
 
 	case 12:
 	  /* The library search path.  */
-	  if (memcmp (envline, "LIBRARY_PATH", 12) == 0)
+	  if (!__libc_enable_secure
+	      && memcmp (envline, "LIBRARY_PATH", 12) == 0)
 	    {
 	      library_path = &envline[13];
 	      break;