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Check criticalSharedRelcachesBuilt in GetSharedSecurityLabel().

An extension may want to call GetSecurityLabel() on a shared objectbefore the shared relcaches are fully initialized. For instance, aClientAuthentication_hook might want to retrieve the security label ona role.Discussion:https://postgr.es/m/ecb7af0b26e3be1d96d291c8453a86f1f82d9061.camel@j-davis.comBackpatch-through: 9.6

1 parent4d5f651 commit7821a0bCopy full SHA for 7821a0b

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src/backend/commands
- seclabel.c

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`‎src/backend/commands/seclabel.c`

Lines changed: 2 additions & 2 deletions

Original file line number	Diff line number	Diff line change
`@@ -244,8 +244,8 @@ GetSharedSecurityLabel(const ObjectAddress object, const char provider)`
`244`	`244`
`245`	`245`	`pg_shseclabel=table_open(SharedSecLabelRelationId,AccessShareLock);`
`246`	`246`
`247`		`-scan=systable_beginscan(pg_shseclabel,SharedSecLabelObjectIndexId, true,`
`248`		`-NULL,3,keys);`
	`247`	`+scan=systable_beginscan(pg_shseclabel,SharedSecLabelObjectIndexId,`
	`248`	`+criticalSharedRelcachesBuilt,NULL,3,keys);`
`249`	`249`
`250`	`250`	`tuple=systable_getnext(scan);`
`251`	`251`	`if (HeapTupleIsValid(tuple))`

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Commit7821a0b

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`‎src/backend/commands/seclabel.c`

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