elf: Ignore LD_LIBRARY_PATH and debug env var for setuid for static

It mimics the ld.so behavior.

Checked on x86_64-linux-gnu.
Reviewed-by: Siddhesh Poyarekar <siddhesh@sourceware.org>

elf/dl-support.c

@@ -272,8 +272,6 @@ _dl_non_dynamic_init (void)
   _dl_main_map.l_phdr = GL(dl_phdr);
   _dl_main_map.l_phnum = GL(dl_phnum);
 
-  _dl_verbose = *(getenv ("LD_WARN") ?: "") == '\0' ? 0 : 1;
-
   /* Set up the data structures for the system-supplied DSO early,
      so they can influence _dl_init_paths.  */
   setup_vdso (NULL, NULL);
@@ -281,6 +279,22 @@ _dl_non_dynamic_init (void)
   /* With vDSO setup we can initialize the function pointers.  */
   setup_vdso_pointers ();
 
+  if (__libc_enable_secure)
+    {
+      static const char unsecure_envvars[] =
+	UNSECURE_ENVVARS
+	;
+      const char *cp = unsecure_envvars;
+
+      while (cp < unsecure_envvars + sizeof (unsecure_envvars))
+	{
+	  __unsetenv (cp);
+	  cp = strchr (cp, '\0') + 1;
+	}
+    }
+
+  _dl_verbose = *(getenv ("LD_WARN") ?: "") == '\0' ? 0 : 1;
+
   /* Initialize the data structures for the search paths for shared
      objects.  */
   _dl_init_paths (getenv ("LD_LIBRARY_PATH"), "LD_LIBRARY_PATH",
@@ -297,20 +311,6 @@ _dl_non_dynamic_init (void)
 
   _dl_dynamic_weak = *(getenv ("LD_DYNAMIC_WEAK") ?: "") == '\0';
 
-  if (__libc_enable_secure)
-    {
-      static const char unsecure_envvars[] =
-	UNSECURE_ENVVARS
-	;
-      const char *cp = unsecure_envvars;
-
-      while (cp < unsecure_envvars + sizeof (unsecure_envvars))
-	{
-	  __unsetenv (cp);
-	  cp = strchr (cp, '\0') + 1;
-	}
-    }
-
 #ifdef DL_PLATFORM_INIT
   DL_PLATFORM_INIT;
 #endif