From: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
---|---|
To: | pgsql-committers(at)lists(dot)postgresql(dot)org |
Subject: | pgsql: Fix confusion about event trigger vs. plain function in plpgsql. |
Date: | 2020-02-19 19:45:31 |
Message-ID: | E1j4VHn-0004IG-0F@gemulon.postgresql.org |
Views: | Raw Message | Whole Thread | Download mbox | Resend email |
Thread: | |
Lists: | pgsql-committers |
Fix confusion about event trigger vs. plain function in plpgsql.
The function hash table keys made by compute_function_hashkey() failed
to distinguish event-trigger call context from regular call context.
This meant that once we'd successfully made a hash entry for an event
trigger (either by validation, or by normal use as an event trigger),
an attempt to call the trigger function as a plain function would
find this hash entry and thereby bypass the you-can't-do-that check in
do_compile(). Thus we'd attempt to execute the function, leading to
strange errors or even crashes, depending on function contents and
server version.
To fix, add an isEventTrigger field to PLpgSQL_func_hashkey,
paralleling the longstanding infrastructure for regular triggers.
This fits into what had been pad space, so there's no risk of an ABI
break, even assuming that any third-party code is looking at these
hash keys. (I considered replacing isTrigger with a PLpgSQL_trigtype
enum field, but felt that that carried some API/ABI risk. Maybe we
should change it in HEAD though.)
Per bug #16266 from Alexander Lakhin. This has been broken since
event triggers were invented, so back-patch to all supported branches.
Discussion: https://postgr.es/m/16266-fcd7f838e97ba5d4@postgresql.org
Branch
------
REL_10_STABLE
Details
-------
https://git.postgresql.org/pg/commitdiff/6af63cf8c0b905f5c20cecff03b30ef52594e5f9
Modified Files
--------------
src/pl/plpgsql/src/pl_comp.c | 15 +++++++++++----
src/pl/plpgsql/src/plpgsql.h | 5 +++--
src/test/regress/expected/event_trigger.out | 4 ++++
src/test/regress/sql/event_trigger.sql | 3 +++
4 files changed, 21 insertions(+), 6 deletions(-)
From | Date | Subject | |
---|---|---|---|
Next Message | Peter Eisentraut | 2020-02-19 20:18:05 | pgsql: Fix typo |
Previous Message | Tom Lane | 2020-02-19 19:45:30 | pgsql: Fix confusion about event trigger vs. plain function in plpgsql. |