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Commita27be40

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Set GUC "is_superuser" in all processes that set AuthenticatedUserId.
It was always false in single-user mode, in autovacuum workers, and inbackground workers. This had no specifically-identified securityconsequences, but non-core code or future work might make itsecurity-relevant. Back-patch to v11 (all supported versions).Jelte Fennema-Nio. Reported by Jelte Fennema-Nio.
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‎src/backend/utils/init/miscinit.c

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@@ -700,6 +700,14 @@ InitializeSessionUserIdStandalone(void)
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AuthenticatedUserIsSuperuser= true;
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SetSessionUserId(BOOTSTRAP_SUPERUSERID, true);
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/*
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* XXX This should set SetConfigOption("session_authorization"), too.
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* Since we don't, C code will get NULL, and current_setting() will get an
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* empty string.
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*/
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SetConfigOption("is_superuser","on",
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PGC_INTERNAL,PGC_S_DYNAMIC_DEFAULT);
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}
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