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Tom Lane ef1b5af823 Do not let PostmasterContext survive into background workers. 
We don't want postmaster child processes to contain a copy of the
postmaster's PostmasterContext.  That would be a waste of memory at least,
and at worst a security issue, since there are copies of the semi-sensitive
pg_hba and pg_ident data in there.  All other child process types delete
the PostmasterContext after forking, but the original coding of the
background worker patch (commit da07a1e85) did not do so.  It appears
that the only reason for that was to avoid copying the bgworker's
MyBgworkerEntry out of that context; but the couple of additional
statements needed to do so are hardly good justification for it.  Hence,
copy that data and then clear the context as other child processes do.

Because this patch changes the memory context in which a bgworker function
gains control, back-patching it would be a bit risky, so we won't fix this
in back branches.  The "security" complaint is pretty thin anyway for
generic bgworkers; only with the introduction of parallel query is there
any question of running untrusted code in a bgworker process.

Discussion: <14111.1470082717@sss.pgh.pa.us>
2016-08-03 14:48:13 -04:00
config Update config.guess and config.sub 2016-05-06 14:02:44 -04:00
contrib Fix assorted fallout from IS [NOT] NULL patch. 2016-07-28 16:09:15 -04:00
doc doc: Remove documentation of nonexistent information schema columns 2016-08-03 13:50:13 -04:00
src Do not let PostmasterContext survive into background workers. 2016-08-03 14:48:13 -04:00
.dir-locals.el emacs: Set indent-tabs-mode in perl-mode 2015-04-12 23:53:23 -04:00
.gitattributes Fix whitespace and remove obsolete gitattributes entry 2016-03-13 16:03:13 -04:00
.gitignore Add .gitignore entries for AIX-specific intermediate build artifacts. 2015-07-08 20:44:22 -04:00
aclocal.m4 Replace our hacked version of ax_pthread.m4 with latest upstream version. 2015-07-08 20:36:06 +03:00
configure Stamp 9.6beta3. 2016-07-18 16:54:26 -04:00
configure.in Stamp 9.6beta3. 2016-07-18 16:54:26 -04:00
COPYRIGHT Update copyright for 2016 2016-01-02 13:33:40 -05:00
GNUmakefile.in Fix distclean/maintainer-clean targets to remove top-level tmp_install dir. 2015-05-13 18:48:05 -04:00
HISTORY Improve text of stub HISTORY file. 2014-02-12 18:16:17 -05:00
Makefile Allow make check in PL directories 2011-02-15 06:52:12 +02:00
README Don't generate plain-text HISTORY and src/test/regress/README anymore. 2014-02-10 20:48:04 -05:00
README.git Don't generate plain-text HISTORY and src/test/regress/README anymore. 2014-02-10 20:48:04 -05:00

README 

PostgreSQL Database Management System
=====================================

This directory contains the source code distribution of the PostgreSQL
database management system.

PostgreSQL is an advanced object-relational database management system
that supports an extended subset of the SQL standard, including
transactions, foreign keys, subqueries, triggers, user-defined types
and functions.  This distribution also contains C language bindings.

PostgreSQL has many language interfaces, many of which are listed here:

	http://www.postgresql.org/download

See the file INSTALL for instructions on how to build and install
PostgreSQL.  That file also lists supported operating systems and
hardware platforms and contains information regarding any other
software packages that are required to build or run the PostgreSQL
system.  Copyright and license information can be found in the
file COPYRIGHT.  A comprehensive documentation set is included in this
distribution; it can be read as described in the installation
instructions.

The latest version of this software may be obtained at
http://www.postgresql.org/download/.  For more information look at our
web site located at http://www.postgresql.org/.