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| author | Fujii Masao <fujii@postgresql.org> | 2015-07-09 22:30:52 +0900 |
|---|---|---|
| committer | Fujii Masao <fujii@postgresql.org> | 2015-07-09 22:30:52 +0900 |
| commit | c2e5f4d1c16faa84a19906706481cf149769f320 (patch) | |
| tree | c91df42a1513684acc332a7d37ac8bf7bcfdd3e0 /doc/src | |
| parent | 23b8928829038ef3fba5a04e4f2707c6034464c4 (diff) | |
| download | postgresql-c2e5f4d1c16faa84a19906706481cf149769f320.tar.gz postgresql-c2e5f4d1c16faa84a19906706481cf149769f320.zip | |
Make wal_compression PGC_SUSET rather than PGC_USERSET.
When enabling wal_compression, there is a risk to leak data similarly to
the BREACH and CRIME attacks on SSL where the compression ratio of
a full page image gives a hint of what is the existing data of this page.
This vulnerability is quite cumbersome to exploit in practice, but doable.
So this patch makes wal_compression PGC_SUSET in order to prevent
non-superusers from enabling it and exploiting the vulnerability while
DBA thinks the risk very seriously and disables it in postgresql.conf.
Back-patch to 9.5 where wal_compression was introduced.
Diffstat (limited to 'doc/src')
| -rw-r--r-- | doc/src/sgml/config.sgml | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/doc/src/sgml/config.sgml b/doc/src/sgml/config.sgml index 4b7bd8a86e6..b91d6c75d27 100644 --- a/doc/src/sgml/config.sgml +++ b/doc/src/sgml/config.sgml @@ -2303,6 +2303,7 @@ include_dir 'conf.d' <xref linkend="guc-full-page-writes"> is on or during a base backup. A compressed page image will be decompressed during WAL replay. The default value is <literal>off</>. + Only superusers can change this setting. </para> <para> |