What is the state of play with this item? I think this is a must-fix bug for 8.3. There was a flurry of messages back in April but since then I don't recall seeing anything.


cheers

andrew



Mark Dilger wrote:
Mark Dilger wrote:
Bruce Momjian wrote:
Added to TODO:

* Fix cases where invalid byte encodings are accepted by the database,
      but throw an error on SELECT
http://archives.postgresql.org/pgsql-hackers/2007-03/msg00767.php

Is anyone working on fixing this bug?

Hi, has anyone volunteered to fix this bug? I did not see any reply on the mailing list to your question above.

mark

OK, I can take a stab at fixing this. I'd like to state some assumptions so people can comment and reply:

I assume that I need to fix *all* cases where invalid byte encodings get into the database through functions shipped in the core distribution.

I assume I do not need to worry about people getting bad data into the system through their own database extensions.

I assume that the COPY problem discussed up-thread goes away once you eliminate all the paths by which bad data can get into the system. However, existing database installations with bad data already loaded will not be magically fixed with these code patches.

Do any of the string functions (see http://www.postgresql.org/docs/8.2/interactive/functions-string.html) run the risk of generating invalid utf8 encoded strings? Do I need to add checks? Are there known bugs with these functions in this regard?

If not, I assume I can add mbverify calls to the various input routines (textin, varcharin, etc) where invalid utf8 could otherwise enter the system.

I assume that this work can be limited to HEAD and that I don't need to back-patch it. (I suspect this assumption is a contentious one.)

Advice and comments are welcome,



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