Hi,

On 6/21/23 3:43 PM, Tom Lane wrote:
Kyotaro Horiguchi <horikyota....@gmail.com> writes:
At Wed, 21 Jun 2023 09:43:50 +0200, "Drouvot, Bertrand" 
<bertranddrouvot...@gmail.com> wrote in
Trying to connect with the 64 bytes name:
$ psql -d ääääääääääääääääääääääääääääääää
psql: error: connection to server on socket "/tmp/.s.PGSQL.55448"
failed: FATAL: database "äääääääääääääääääääääääääääääää" does not
exist

IMHO, I'm not sure we should allow connections without the exact name
being provided. In that sense, I think we might want to consider
outright rejecting the estblishment of a connection when the given
database name doesn't fit the startup packet, since the database with
the exact given name cannot be found.

I think I agree.  I don't like the proposed patch at all, because it's
making completely unsupportable assumptions about what encoding the
names are given in.  Simply failing to match when a name is overlength
sounds safer.


Yeah, that's another and "cleaner" option.

I'll propose a patch to make it failing even for the non multibyte case then (
so that multibyte and non multibyte behaves the same aka failing in case of 
overlength
name is detected).

Regards,

--
Bertrand Drouvot
PostgreSQL Contributors Team
RDS Open Source Databases
Amazon Web Services: https://aws.amazon.com


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