[bug #66546] [troff] restrict `cf` request to unsafe mode

[G. Branden Robinson]

URL:
  <https://savannah.gnu.org/bugs/?66546>

                 Summary: [troff] restrict `cf` request to unsafe mode
                   Group: GNU roff
               Submitter: gbranden
               Submitted: Sun 08 Dec 2024 05:57:16 PM UTC
                Category: Core
                Severity: 3 - Normal
              Item Group: Feature change
                  Status: In Progress
                 Privacy: Public
             Assigned to: gbranden
             Open/Closed: Open
         Discussion Lock: Any
         Planned Release: None


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Follow-up Comments:


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Date: Sun 08 Dec 2024 05:57:16 PM UTC By: G. Branden Robinson <gbranden>
The `cf` request can put arbitrary C0 and C1 controls into GNU _troff_ output,
but that output format (_groff_'s page description language) is a plain text
ASCII/ISO 646 file format.

`cf` is little-used in the first place, so I expect low impact.

`trf` remains available in the default "safer" mode.







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