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Prevent privilege escalation in explicit calls to PL validators.

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The primary role of PL validators is to be called implicitly during
CREATE FUNCTION, but they are also normal functions that a user can call
explicitly.  Add a permissions check to each validator to ensure that a
user cannot use explicit validator calls to achieve things he could not
otherwise achieve.  Back-patch to 8.4 (all supported versions).
Non-core procedural language extensions ought to make the same two-line
change to their own validators.

Andres Freund, reviewed by Tom Lane and Noah Misch.

Security: CVE-2014-0061
This commit is contained in:
Noah Misch
2014-02-17 09:33:31 -05:00
parent fea164a72a
commit 537cbd35c8
8 changed files with 109 additions and 2 deletions
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4
src/pl/plperl/plperl.c
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@@ -1883,6 +1883,9 @@ plperl_validator(PG_FUNCTION_ARGS)
bool is_event_trigger = false;
int i;
if (!CheckFunctionValidatorAccess(fcinfo->flinfo->fn_oid, funcoid))
PG_RETURN_VOID();
/* Get the new function's pg_proc entry */
tuple = SearchSysCache1(PROCOID, ObjectIdGetDatum(funcoid));
if (!HeapTupleIsValid(tuple))
@@ -1964,6 +1967,7 @@ PG_FUNCTION_INFO_V1(plperlu_validator);
Datum
plperlu_validator(PG_FUNCTION_ARGS)
{
/* call plperl validator with our fcinfo so it gets our oid */
return plperl_validator(fcinfo);
}