lib/chkname.c, src/: Strictly disallow really bad names

Some names are bad, and some names are really bad.  '--badname' should
only allow the mildly bad ones, which we can handle.  Some names are too
bad, and it's not possible to deal with them.  Reject them
unconditionally.

Acked-by: Chris Hofstaedtler <[email protected]>
Acked-by: Tobias Stoeckmann <[email protected]>
Cc: Marc 'Zugschlus' Haber <[email protected]>
Cc: Iker Pedrosa <[email protected]>
Cc: Serge Hallyn <[email protected]>
Signed-off-by: Alejandro Colomar <[email protected]>

Author: alejandro-colomar

lib/chkname.c

@@ -67,7 +67,7 @@ is_valid_name(const char *name)
 	 || streq(name, ".")
 	 || streq(name, "..")
 	 || strspn(name, "-")
-	 || strpbrk(name, " \"#,/:;")
+	 || strpbrk(name, " !\"#&*+,/:;@|~")
 	 || strchriscntrl(name)
 	 || strisdigit(name))
 	{