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List:       postgresql-general
Subject:    [HACKERS] Multibyte bug in hba.c regular expression processing
From:       Tom Lane <tgl () sss ! pgh ! pa ! us>
Date:       2013-07-31 13:58:36
Message-ID: 11727.1375279116 () sss ! pgh ! pa ! us
[Download RAW message or body]

It appears to me that check_ident_usermap() will substitute incorrectly
for \1 if the user name contains any multibyte characters, because
it supposes that the "rm_so" and "rm_eo" numbers returned by pg_regexec()
are byte offsets, when in reality they are character offsets.

Correct code for this would need to use charlen_to_bytelen() to navigate
the string to the proper places, as is done in replace_text_regexp() for
example.

I'm not terribly excited about fixing this myself, but perhaps someone
else would like to.

			regards, tom lane


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