| From: | "Bossart, Nathan" <bossartn(at)amazon(dot)com> |
|---|---|
| To: | Michael Paquier <michael(at)paquier(dot)xyz>, Andres Freund <andres(at)anarazel(dot)de> |
| Cc: | "pgsql-hackers(at)lists(dot)postgresql(dot)org" <pgsql-hackers(at)lists(dot)postgresql(dot)org>, Robert Haas <robertmhaas(at)gmail(dot)com>, "Schneider, Jeremy" <schnjere(at)amazon(dot)com>, PostgreSQL-development <pgsql-hackers(at)postgresql(dot)org>, "Albin, Lloyd P" <lalbin(at)scharp(dot)org> |
| Subject: | Re: BUG #15182: Canceling authentication due to timeout aka Denial of Service Attack |
| Date: | 2018-07-26 15:40:07 |
| Message-ID: | 082C3D70-C39D-41F4-B889-C128D09DE02E@amazon.com |
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| Lists: | pgsql-bugs pgsql-hackers |
On 7/26/18, 10:07 AM, "Bossart, Nathan" <bossartn(at)amazon(dot)com> wrote:
> The first time we use this callback, the relation won't be locked, so
> isn't it possible that we won't get a valid tuple here? I did notice
> that callbacks like RangeVarCallbackForRenameRule,
> RangeVarCallbackForPolicy, and RangeVarCallbackForRenameTrigger assume
> that the relation can be concurrently dropped, but
> RangeVarCallbackOwnsRelation does not. Instead, we assume that the
> syscache search will succeed if the given OID is valid. Is this a
> bug, or am I missing something?
Please pardon the noise. I see that we don't accept invalidation
messages until later on in RangeVarGetRelidExtended(), at which point
we'll retry and get InvalidOid for concurrently dropped relations.
Nathan
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