[bug #65248] [eqn] doesn't detect recursive macro definitions, permitting infinite loops

[G. Branden Robinson]

URL:
  <https://savannah.gnu.org/bugs/?65248>

                 Summary: [eqn] doesn't detect recursive macro definitions,
permitting infinite loops
                   Group: GNU roff
               Submitter: gbranden
               Submitted: Sun 04 Feb 2024 05:48:08 AM UTC
                Category: Preprocessor eqn
                Severity: 4 - Important
              Item Group: Crash/Unresponsive
                  Status: None
                 Privacy: Public
             Assigned to: None
             Open/Closed: Open
         Discussion Lock: Any
         Planned Release: None


    _______________________________________________________

Follow-up Comments:


-------------------------------------------------------
Date: Sun 04 Feb 2024 05:48:08 AM UTC By: G. Branden Robinson <gbranden>
Noticed by Ingo Schwarze
[https://cvsweb.bsd.lv/mandoc/eqn_parse.h?rev=1.4&content-type=text/x-cvsweb-markup&sortby=date
in _mandoc_ CVS].


.EQ
define inner "content"
define outer "inner outer"
outer
.EN

This endless loop was found by tb@ using afl(1).

Incidentally, GNU eqn(1) also performs an infinite loop in this
situation and then crashes when memory runs out, but that's not an
excuse for nasty behaviour of mandoc(1).









    _______________________________________________________

Reply to this item at:

  <https://savannah.gnu.org/bugs/?65248>

_______________________________________________
Message sent via Savannah
https://savannah.gnu.org/