Re: FPW compression leaks information

From: Heikki Linnakangas <hlinnaka(at)iki(dot)fi>
To: Stephen Frost <sfrost(at)snowman(dot)net>
Cc: pgsql-hackers <pgsql-hackers(at)postgresql(dot)org>
Subject: Re: FPW compression leaks information
Date: 2015-04-09 16:05:00
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On 04/09/2015 06:28 PM, Stephen Frost wrote:
> * Heikki Linnakangas (hlinnaka(at)iki(dot)fi) wrote:
>> What should we do about this? Make it configurable on a per-table
>> basis? Disable FPW compression on system tables? Disable FPW on
>> tables you don't have SELECT access to? Add a warning to the docs?
> REVOKE EXECUTE ON FUNCTION pg_current_xlog_insert_location() FROM public;

Yeah, that's one option. Will also have to revoke access to
pg_stat_replication and anything else that might indirectly give away
the current WAL position.

- Heikki

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