[Tcl-bugs] [ tcl-Bugs-1577730 ] interp transfer leaks information when transfering channels

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Bugs item #1577730, was opened at 2006-10-15 20:07
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Category: 20. [interp]
Group: development: 8.5a5
Status: Open
Resolution: None
Priority: 5
Submitted By: Michael Schlenker (mic42)
Assigned to: Jeffrey Hobbs (hobbs)
Summary: interp transfer leaks information when transfering channels

Initial Comment:
The interp transfer command leaks some information, the
channel name, which can be used to determine if a
channel is connected to a file or socket for example,
into a safe interpreter.

As there is currently no easy way to rename a channel,
building a token like it is done for filenames in the
safe base is not as easy as it could be.

This is more a suggestion for tcl 9, but interp
transfer could return an interp specific alias token,
so that a safe slave could not determine what kind of
channel he gets from the opaque value.



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