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David Rowley 6f3820f37a Fix race condition in TupleDescCompactAttr assert code 
5983a4cff added CompactAttribute as an abbreviated alternative to
FormData_pg_attribute to allow more cache-friendly processing in tasks
related to TupleDescs.  That commit contained some assert-only code to
check that the CompactAttribute had been populated correctly, however,
the method used to do that checking caused the TupleDesc's
CompactAttribute to be zeroed before it was repopulated and compared to
the snapshot taken before the memset call.  This caused issues as the type
cache caches TupleDescs in shared memory which can be used by multiple
backend processes at the same time.  There was a window of time between
the zero and repopulation of the CompactAttribute where another process
would mistakenly think that the CompactAttribute is invalid due to the
memset.

To fix this, instead of taking a snapshot of the CompactAttribute and
calling populate_compact_attribute() and comparing the snapshot to the
freshly populated TupleDesc's CompactAttribute, refactor things so we
can just populate a temporary CompactAttribute on the stack.  This way
we don't touch the TupleDesc's memory.

Reported-by: Alexander Lakhin, SQLsmith
Discussion: https://postgr.es/m/ca3a256a-5d12-42db-aabe-a75a030d9fb9@gmail.com
2024-12-24 14:54:24 +13:00
.github Add CODE_OF_CONDUCT.md, CONTRIBUTING.md, and SECURITY.md. 2024-07-02 13:03:58 -05:00
config Use <stdint.h> and <inttypes.h> for c.h integers. 2024-12-04 15:05:38 +13:00
contrib postgres_fdw: re-issue cancel requests a few times if necessary. 2024-12-23 15:14:30 -05:00
doc Try to avoid semaphore-related test failures on NetBSD/OpenBSD. 2024-12-23 16:46:24 -05:00
src Fix race condition in TupleDescCompactAttr assert code 2024-12-24 14:54:24 +13:00
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configure Use <stdint.h> and <inttypes.h> for c.h integers. 2024-12-04 15:05:38 +13:00
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HISTORY Canonicalize some URLs 2020-02-10 20:47:50 +01:00
Makefile Remove AIX support 2024-02-28 15:17:23 +04:00
meson_options.txt Make PG_TEST_EXTRA env var override the "meson setup" option 2024-11-04 14:09:25 +02:00
meson.build Use <stdint.h> and <inttypes.h> for c.h integers. 2024-12-04 15:05:38 +13:00
README.md Revise the style of a paragraph in README.md. 2024-03-21 10:16:41 -05:00

README.md

PostgreSQL Database Management System

This directory contains the source code distribution of the PostgreSQL database management system.

PostgreSQL is an advanced object-relational database management system that supports an extended subset of the SQL standard, including transactions, foreign keys, subqueries, triggers, user-defined types and functions. This distribution also contains C language bindings.

Copyright and license information can be found in the file COPYRIGHT.

General documentation about this version of PostgreSQL can be found at https://www.postgresql.org/docs/devel/. In particular, information about building PostgreSQL from the source code can be found at https://www.postgresql.org/docs/devel/installation.html.

The latest version of this software, and related software, may be obtained at https://www.postgresql.org/download/. For more information look at our web site located at https://www.postgresql.org/.