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Tom Lane 4203842a1c Use pg_strong_random() to select each server process's random seed. Previously we just set the seed based on process ID and start timestamp. Both those values are directly available within the session, and can be found out or guessed by other users too, making the session's series of random(3) values fairly predictable. Up to now, our backend-internal uses of random(3) haven't seemed security-critical, but commit `88bdbd3f7` added one that potentially is: when using log_statement_sample_rate, a user might be able to predict which of his SQL statements will get logged. To improve this situation, upgrade the per-process seed initialization method to use pg_strong_random() if available, greatly reducing the predictability of the initial seed value. This adds a few tens of microseconds to process start time, but since backend startup time is at least a couple of milliseconds, that seems an acceptable price. This means that pg_strong_random() needs to be able to run without reliance on any backend infrastructure, since it will be invoked before any of that is up. It was safe for that already, but adjust comments and #include commands to make it clearer. Discussion: https://postgr.es/m/3859.1545849900@sss.pgh.pa.us		2018-12-29 17:56:06 -05:00
config	Update config/ax_pthread.m4 to latest upstream version.	2018-11-19 15:05:33 -05:00
contrib	Remove obsolete IndexIs* macros	2018-12-27 10:07:46 +01:00
doc	Use a separate random seed for SQL random()/setseed() functions.	2018-12-29 17:33:27 -05:00
src	Use pg_strong_random() to select each server process's random seed.	2018-12-29 17:56:06 -05:00
.dir-locals.el	Update documentation editor setup instructions	2018-07-13 21:23:41 +02:00
.gitattributes	Remove contrib/tsearch2.	2017-02-13 11:06:11 -05:00
.gitignore	Support for optimizing and emitting code in LLVM JIT provider.	2018-03-22 11:05:22 -07:00
COPYRIGHT	Update copyright for 2018	2018-01-02 23:30:12 -05:00
GNUmakefile.in	Remove unwanted "garbage cleanup" logic in Makefiles.	2018-08-08 14:32:29 -04:00
HISTORY	Change documentation references to PG website to use https: not http:	2017-05-20 21:50:47 -04:00
Makefile	Fix non-GNU makefiles for AIX make.	2017-11-30 00:57:22 -08:00
README	Change documentation references to PG website to use https: not http:	2017-05-20 21:50:47 -04:00
README.git	Change documentation references to PG website to use https: not http:	2017-05-20 21:50:47 -04:00
aclocal.m4	Fix configure's AC_CHECK_DECLS tests to work correctly with clang.	2018-11-19 12:01:47 -05:00
configure	Drop support for getting signal descriptions from sys_siglist[].	2018-12-17 13:50:16 -05:00
configure.in	Drop support for getting signal descriptions from sys_siglist[].	2018-12-17 13:50:16 -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:

	https://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
https://www.postgresql.org/download/.  For more information look at our
web site located at https://www.postgresql.org/.