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. Branch ------ master Details ------- http://git.postgresql.org/pg/commitdiff/c2e5f4d1c16faa84a19906706481cf149769f320 Modified Files -------------- doc/src/sgml/config.sgml | 1 + src/backend/utils/misc/guc.c | 2 +- 2 files changed, 2 insertions(+), 1 deletion(-) -- Sent via pgsql-committers mailing list (pgsql-committers@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-committers
