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David Rowley b76fb6c2a9 Temporarily make MemoryContextContains return false 
5265e91fd changed MemoryContextContains to update it so that it works
correctly with the new MemoryChunk code added in c6e0fe1f2.  However,
5265e91fd was done with the assumption that MemoryContextContains would
only ever be given pointers to memory that had been returned by one of our
MemoryContext allocators.  It seems that's not true and many of our 32-bit
buildfarm animals are clearly showing that.

There are some code paths that call MemoryContextContains with a pointer
pointing part way into an allocated chunk.  The example of this found by
the 32-bit buildfarm animals is the int2int4_sum() function.  This
function returns transdata->sum, which is not a pointer to memory that was
allocated directly.  This return value is then subsequently passed to
MemoryContextContains which causes it to crash due to it thinking the
memory directly prior to that pointer is a MemoryChunk.  What's actually
in that memory is the field in the struct that comes prior to the "sum"
field.  This problem didn't occur in 64-bit world because BIGINT is a
byval type and the code which was calling MemoryContextContains with the
bad pointer only does so with non-byval types.

Here, instead of reverting 5265e91fd and making MemoryContextContains
completely broken again, let's just make it always return false for now.
Effectively prior to 5265e91fd it was doing that anyway, this at least
makes that more explicit.  The only repercussions of this with the current
MemoryContextContains calls are that we perform a datumCopy() when we
might not need to.  This should make the 32-bit buildfarm animals happy
again and give us more time to consider a long-term fix.

Discussion: https://postgr.es/m/20220907130552.sfjri7jublfxyyi4%40jrouhaud
2022-09-09 00:28:38 +12:00
config Remove further unwanted linker flags from perl_embed_ldflags 2022-08-23 16:27:24 +02:00
contrib Fix an assortment of improper usages of string functions 2022-09-06 13:19:44 +12:00
doc doc: Fix PL/pgSQL casing to be consistent 2022-09-08 09:56:50 +02:00
src Temporarily make MemoryContextContains return false 2022-09-09 00:28:38 +12:00
.cirrus.yml ci: remove minor version from freebsd image name 2022-07-31 18:51:47 -07:00
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.gitignore Support for optimizing and emitting code in LLVM JIT provider. 2018-03-22 11:05:22 -07:00
aclocal.m4 Probe $PROVE not $PERL while checking for modules needed by TAP tests. 2021-11-22 12:54:52 -05:00
configure Remove configure probe for sockaddr_in6 and require AF_INET6. 2022-08-26 10:18:30 +12:00
configure.ac Remove configure probe for sockaddr_in6 and require AF_INET6. 2022-08-26 10:18:30 +12:00
COPYRIGHT Update copyright for 2022 2022-01-07 19:04:57 -05:00
GNUmakefile.in Run tests of libpq on installcheck-world, checkprep and check-world 2022-06-03 13:15:20 +09:00
HISTORY Canonicalize some URLs 2020-02-10 20:47:50 +01:00
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README Canonicalize some URLs 2020-02-10 20:47:50 +01:00
README.git Canonicalize some URLs 2020-02-10 20:47:50 +01:00

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/.