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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 parentfd059ac commit0b90f1cCopy full SHA for 0b90f1c

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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
`@@ -243,8 +243,8 @@ GetSharedSecurityLabel(const ObjectAddress object, const char provider)`
`243`	`243`
`244`	`244`	`pg_shseclabel=table_open(SharedSecLabelRelationId,AccessShareLock);`
`245`	`245`
`246`		`-scan=systable_beginscan(pg_shseclabel,SharedSecLabelObjectIndexId, true,`
`247`		`-NULL,3,keys);`
	`246`	`+scan=systable_beginscan(pg_shseclabel,SharedSecLabelObjectIndexId,`
	`247`	`+criticalSharedRelcachesBuilt,NULL,3,keys);`
`248`	`248`
`249`	`249`	`tuple=systable_getnext(scan);`
`250`	`250`	`if (HeapTupleIsValid(tuple))`

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Commit0b90f1c

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`‎src/backend/commands/seclabel.c`

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