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| author | Alexander Korotkov <akorotkov@postgresql.org> | 2023-04-23 13:58:25 +0300 |
|---|---|---|
| committer | Alexander Korotkov <akorotkov@postgresql.org> | 2023-04-23 14:00:16 +0300 |
| commit | 48c6825d0ec8a5021e95aea666944e9345ceb77d (patch) | |
| tree | a83660291627660d7172605b9aaa02a47529475d /doc/src | |
| parent | 02191136cb25670dc9f086248f7b495d68c965d5 (diff) | |
Validate ltree siglen GiST option to be int-aligned
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
Diffstat (limited to 'doc/src')
| -rw-r--r-- | doc/src/sgml/ltree.sgml | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/doc/src/sgml/ltree.sgml b/doc/src/sgml/ltree.sgml index 06a983c075b..c87899f4190 100644 --- a/doc/src/sgml/ltree.sgml +++ b/doc/src/sgml/ltree.sgml @@ -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> |