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Attempting to use this function with a raw page not coming from a GiST index would cause a crash, as it was missing the same sanity checks as gist_page_items_bytea(). This slightly refactors the code so as all the basic validation checks for GiST pages are done in a single routine, in the same fashion as the pageinspect functions for hash and BRIN. This fixes an issue similar to 076f4d9. A test is added to stress for this case. While on it, I have added a similar test for brin_page_items() with a combination make of a valid GiST index and a raw btree page. This one was already protected, but it was not tested. Reported-by: Egor Chindyaskin Author: Dmitry Koval Discussion: https://postgr.es/m/17815-fc4a2d3b74705703@postgresql.org Backpatch-through: 14
56 lines
2.5 KiB
PL/PgSQL
56 lines
2.5 KiB
PL/PgSQL
-- The gist_page_opaque_info() function prints the page's LSN. Normally,
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-- that's constant 1 (GistBuildLSN) on every page of a freshly built GiST
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-- index. But with wal_level=minimal, the whole relation is dumped to WAL at
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-- the end of the transaction if it's smaller than wal_skip_threshold, which
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-- updates the LSNs. Wrap the tests on gist_page_opaque_info() in the
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-- same transaction with the CREATE INDEX so that we see the LSNs before
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-- they are possibly overwritten at end of transaction.
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BEGIN;
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-- Create a test table and GiST index.
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CREATE TABLE test_gist AS SELECT point(i,i) p, i::text t FROM
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generate_series(1,1000) i;
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CREATE INDEX test_gist_idx ON test_gist USING gist (p);
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-- Page 0 is the root, the rest are leaf pages
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SELECT * FROM gist_page_opaque_info(get_raw_page('test_gist_idx', 0));
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SELECT * FROM gist_page_opaque_info(get_raw_page('test_gist_idx', 1));
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SELECT * FROM gist_page_opaque_info(get_raw_page('test_gist_idx', 2));
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COMMIT;
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SELECT * FROM gist_page_items(get_raw_page('test_gist_idx', 0), 'test_gist_idx');
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SELECT * FROM gist_page_items(get_raw_page('test_gist_idx', 1), 'test_gist_idx') LIMIT 5;
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-- gist_page_items_bytea prints the raw key data as a bytea. The output of that is
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-- platform-dependent (endianess), so omit the actual key data from the output.
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SELECT itemoffset, ctid, itemlen FROM gist_page_items_bytea(get_raw_page('test_gist_idx', 0));
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-- Suppress the DETAIL message, to allow the tests to work across various
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-- page sizes and architectures.
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\set VERBOSITY terse
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-- Failures with non-GiST index.
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CREATE INDEX test_gist_btree on test_gist(t);
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SELECT gist_page_items(get_raw_page('test_gist_btree', 0), 'test_gist_btree');
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SELECT gist_page_items(get_raw_page('test_gist_btree', 0), 'test_gist_idx');
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-- Failure with various modes.
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-- invalid page size
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SELECT gist_page_items_bytea('aaa'::bytea);
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SELECT gist_page_items('aaa'::bytea, 'test_gist_idx'::regclass);
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SELECT gist_page_opaque_info('aaa'::bytea);
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-- invalid special area size
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SELECT * FROM gist_page_opaque_info(get_raw_page('test_gist', 0));
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SELECT gist_page_items_bytea(get_raw_page('test_gist', 0));
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SELECT gist_page_items_bytea(get_raw_page('test_gist_btree', 0));
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\set VERBOSITY default
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-- Tests with all-zero pages.
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SHOW block_size \gset
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SELECT gist_page_items_bytea(decode(repeat('00', :block_size), 'hex'));
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SELECT gist_page_items(decode(repeat('00', :block_size), 'hex'), 'test_gist_idx'::regclass);
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SELECT gist_page_opaque_info(decode(repeat('00', :block_size), 'hex'));
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DROP TABLE test_gist;
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