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Validate ltree siglen GiST option to be int-aligned

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Unaligned siglen could lead to an unaligned access to subsequent key fields.

Backpatch to 13, where opclass options were introduced.

Reported-by: Alexander Lakhin
Bug: 17847
Discussion: https://postgr.es/m/17847-171232970bea406b%40postgresql.org
Reviewed-by: Tom Lane, Pavel Borisov, Alexander Lakhin
Backpatch-through: 13
This commit is contained in:
Alexander Korotkov
2023-04-23 13:58:25 +03:00
parent 9ef5a35837
commit f4a4a18ecb
4 changed files with 27 additions and 4 deletions
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3
doc/src/sgml/ltree.sgml
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@ -636,7 +636,8 @@ Europe & Russia*@ & !Transportation
path labels as a bitmap signature. Its optional integer parameter
<literal>siglen</literal> determines the
signature length in bytes. The default signature length is 8 bytes.
Valid values of signature length are between 1 and 2024 bytes. Longer
The length must be a positive multiple of <type>int</type> alignment
(4 bytes on most machines)) up to 2024. Longer
signatures lead to a more precise search (scanning a smaller fraction of the index and
fewer heap pages), at the cost of a larger index.
</para>