Release date: 2008-01-07
This release contains a variety of fixes from 8.1.10, including fixes for significant security issues. For information about new features in the 8.1 major release, see Section E.226.
This is the last 8.1.X release for which the PostgreSQL community will produce binary packages for Windows. Windows users are encouraged to move to 8.2.X or later, since there are Windows-specific fixes in 8.2.X that are impractical to back-port. 8.1.X will continue to be supported on other platforms.
A dump/restore is not required for those running 8.1.X. However, if you are upgrading from a version earlier than 8.1.2, see Section E.224.
Prevent functions in indexes from executing with the privileges of
the user running VACUUM
, ANALYZE
, etc (Tom)
Functions used in index expressions and partial-index
predicates are evaluated whenever a new table entry is made. It has
long been understood that this poses a risk of trojan-horse code
execution if one modifies a table owned by an untrustworthy user.
(Note that triggers, defaults, check constraints, etc. pose the
same type of risk.) But functions in indexes pose extra danger
because they will be executed by routine maintenance operations
such as VACUUM FULL
, which are commonly performed
automatically under a superuser account. For example, a nefarious user
can execute code with superuser privileges by setting up a
trojan-horse index definition and waiting for the next routine vacuum.
The fix arranges for standard maintenance operations
(including VACUUM
, ANALYZE
, REINDEX
,
and CLUSTER
) to execute as the table owner rather than
the calling user, using the same privilege-switching mechanism already
used for SECURITY DEFINER
functions. To prevent bypassing
this security measure, execution of SET SESSION
AUTHORIZATION
and SET ROLE
is now forbidden within a
SECURITY DEFINER
context. (CVE-2007-6600)
Repair assorted bugs in the regular-expression package (Tom, Will Drewry)
Suitably crafted regular-expression patterns could cause crashes, infinite or near-infinite looping, and/or massive memory consumption, all of which pose denial-of-service hazards for applications that accept regex search patterns from untrustworthy sources. (CVE-2007-4769, CVE-2007-4772, CVE-2007-6067)
Require non-superusers who use /contrib/dblink
to use only
password authentication, as a security measure (Joe)
The fix that appeared for this in 8.1.10 was incomplete, as it plugged
the hole for only some dblink
functions. (CVE-2007-6601,
CVE-2007-3278)
Update time zone data files to tzdata release 2007k (in particular, recent Argentina changes) (Tom)
Improve planner's handling of LIKE/regex estimation in non-C locales (Tom)
Fix planner failure in some cases of WHERE false AND var IN
(SELECT ...)
(Tom)
Preserve the tablespace of indexes that are
rebuilt by ALTER TABLE ... ALTER COLUMN TYPE
(Tom)
Make archive recovery always start a new WAL timeline, rather than only when a recovery stop time was used (Simon)
This avoids a corner-case risk of trying to overwrite an existing archived copy of the last WAL segment, and seems simpler and cleaner than the original definition.
Make VACUUM
not use all of maintenance_work_mem
when the table is too small for it to be useful (Alvaro)
Fix potential crash in translate()
when using a multibyte
database encoding (Tom)
Fix overflow in extract(epoch from interval)
for intervals
exceeding 68 years (Tom)
Fix PL/Perl to not fail when a UTF-8 regular expression is used in a trusted function (Andrew)
Fix PL/Perl to cope when platform's Perl defines type bool
as int
rather than char
(Tom)
While this could theoretically happen anywhere, no standard build of Perl did things this way ... until macOS 10.5.
Fix PL/Python to not crash on long exception messages (Alvaro)
Fix pg_dump to correctly handle inheritance child tables that have default expressions different from their parent's (Tom)
Fix libpq crash when PGPASSFILE
refers
to a file that is not a plain file (Martin Pitt)
ecpg parser fixes (Michael)
Make contrib/pgcrypto
defend against
OpenSSL libraries that fail on keys longer than 128
bits; which is the case at least on some Solaris versions (Marko Kreen)
Make contrib/tablefunc
's crosstab()
handle
NULL rowid as a category in its own right, rather than crashing (Joe)
Fix tsvector
and tsquery
output routines to
escape backslashes correctly (Teodor, Bruce)
Fix crash of to_tsvector()
on huge input strings (Teodor)
Require a specific version of Autoconf to be used
when re-generating the configure
script (Peter)
This affects developers and packagers only. The change was made to prevent accidental use of untested combinations of Autoconf and PostgreSQL versions. You can remove the version check if you really want to use a different Autoconf version, but it's your responsibility whether the result works or not.