Description: if the shell is restricted, reject attempts to add pathnames
 containing slashes to the hash table
Origin: backport, http://git.savannah.gnu.org/cgit/bash.git/commit/?h=bash-4.4-testing&id=a4eef1991c25c9d1c55f777952cd522c762c6fc3
Bug: https://savannah.gnu.org/support/?108969
Bug-Ubuntu: https://bugs.launchpad.net/ubuntu/+source/bash/+bug/1803441

Index: bash-4.3/variables.c
===================================================================
--- bash-4.3.orig/variables.c	2019-07-12 14:12:19.000000000 -0400
+++ bash-4.3/variables.c	2019-07-12 14:24:58.364792719 -0400
@@ -1601,6 +1601,13 @@ assign_hashcmd (self, value, ind, key)
      arrayind_t ind;
      char *key;
 {
+#if defined (RESTRICTED_SHELL)
+  if (restricted && strchr (value, '/'))
+    {
+      sh_restricted (value);
+      return (SHELL_VAR *)NULL;
+    }
+#endif
   phash_insert (key, value, 0, 0);
   return (build_hashcmd (self));
 }