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postgres_fdw: set search_path to 'pg_catalog' while deparsing constants.

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The motivation for this is to ensure successful transmission of the
values of constants of regconfig and other reg* types.  The remote
will be reading them with search_path = 'pg_catalog', so schema
qualification is necessary when referencing objects in other schemas.

Per bug #17483 from Emmanuel Quincerot.  Back-patch to all supported
versions.  (There's some other stuff to do here, but it's less
back-patchable.)

Discussion: https://postgr.es/m/1423433.1652722406@sss.pgh.pa.us
This commit is contained in:
Tom Lane
2022-07-17 17:27:50 -04:00
parent e993166d71
commit 0a7ccee8fe
3 changed files with 37 additions and 0 deletions
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8
contrib/postgres_fdw/postgres_fdw.c
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@ -3896,6 +3896,14 @@ set_transmission_modes(void)
PGC_USERSET, PGC_S_SESSION,
GUC_ACTION_SAVE, true, 0, false);
/*
* In addition force restrictive search_path, in case there are any
* regproc or similar constants to be printed.
*/
(void) set_config_option("search_path", "pg_catalog",
PGC_USERSET, PGC_S_SESSION,
GUC_ACTION_SAVE, true, 0, false);
return nestlevel;
}