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Commitca73753

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Handle RLS dependencies in inlined set-returning functions properly.
If an SRF in the FROM clause references a table having row-levelsecurity policies, and we inline that SRF into the calling query,we neglected to mark the plan as potentially dependent on whichrole is executing it. This could lead to later executions in thesame session returning or hiding rows that should have been hiddenor returned instead.Our thanks to Wolfgang Walther for reporting this problem.Stephen Frost and Tom LaneSecurity:CVE-2023-2455
1 parent681d9e4 commitca73753

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3 files changed

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‎src/backend/optimizer/util/clauses.c

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@@ -5205,6 +5205,13 @@ inline_set_returning_function(PlannerInfo *root, RangeTblEntry *rte)
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*/
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record_plan_function_dependency(root,func_oid);
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/*
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* We must also notice if the inserted query adds a dependency on the
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* calling role due to RLS quals.
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*/
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if (querytree->hasRowSecurity)
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root->glob->dependsOnRole= true;
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returnquerytree;
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/* Here if func is not inlinable: release temp memory and return NULL */

‎src/test/regress/expected/rowsecurity.out

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@@ -4427,6 +4427,33 @@ SELECT * FROM rls_tbl;
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DROP TABLE rls_tbl;
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RESET SESSION AUTHORIZATION;
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-- CVE-2023-2455: inlining an SRF may introduce an RLS dependency
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create table rls_t (c text);
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insert into rls_t values ('invisible to bob');
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alter table rls_t enable row level security;
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grant select on rls_t to regress_rls_alice, regress_rls_bob;
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create policy p1 on rls_t for select to regress_rls_alice using (true);
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create policy p2 on rls_t for select to regress_rls_bob using (false);
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create function rls_f () returns setof rls_t
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stable language sql
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as $$ select * from rls_t $$;
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prepare q as select current_user, * from rls_f();
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set role regress_rls_alice;
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execute q;
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current_user | c
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-------------------+------------------
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regress_rls_alice | invisible to bob
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(1 row)
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set role regress_rls_bob;
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execute q;
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current_user | c
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--------------+---
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(0 rows)
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RESET ROLE;
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DROP FUNCTION rls_f();
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DROP TABLE rls_t;
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--
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-- Clean up objects
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--

‎src/test/regress/sql/rowsecurity.sql

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@@ -2127,6 +2127,26 @@ SELECT * FROM rls_tbl;
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DROPTABLE rls_tbl;
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RESET SESSION AUTHORIZATION;
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-- CVE-2023-2455: inlining an SRF may introduce an RLS dependency
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createtablerls_t (ctext);
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insert into rls_tvalues ('invisible to bob');
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altertable rls_t enable row level security;
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grantselecton rls_t to regress_rls_alice, regress_rls_bob;
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create policy p1on rls_t forselect to regress_rls_alice using (true);
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create policy p2on rls_t forselect to regress_rls_bob using (false);
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createfunctionrls_f () returns setof rls_t
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stable language sql
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as $$select*from rls_t $$;
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prepare qasselectcurrent_user,*from rls_f();
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set role regress_rls_alice;
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execute q;
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set role regress_rls_bob;
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execute q;
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RESET ROLE;
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DROPFUNCTION rls_f();
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DROPTABLE rls_t;
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--
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-- Clean up objects
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--

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