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Re: Range Types - typo + NULL string constructor

From: Jeff Davis <pgsql(at)j-davis(dot)com>
To: Heikki Linnakangas <heikki(dot)linnakangas(at)enterprisedb(dot)com>
Cc: Alexander Korotkov <aekorotkov(at)gmail(dot)com>, pgsql-hackers(at)postgresql(dot)org
Subject: Re: Range Types - typo + NULL string constructor
Date: 2011-10-25 16:37:12
Message-ID: 1319560632.27819.16.camel@jdavis (view raw or flat)
Thread:
Lists: pgsql-hackers
On Mon, 2011-10-24 at 13:15 +0300, Heikki Linnakangas wrote:
> Hmm, I don't think that's safe. After Oid wraparound, a range type oid 
> might get reused for some other range type, and the cache would return 
> stale values. Extremely unlikely to happen by accident, but could be 
> exploited by an attacker.
> 

Any ideas on how to remedy that? I don't have another plan for making it
perform well. Plugging it into the cache invalidation mechanism seems
like overkill, but I suppose that would solve the problem.

Aren't there a few other cases like this floating around the code? I
know the single-xid cache is potentially vulnerable to xid wraparound
for the same reason.

Regards,
	Jeff Davis


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