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On platforms that have getrlimit(RLIMIT_STACK), use it to ensure that

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max_stack_depth is not set to an unsafe value.

This commit also provides configure-time checking for <sys/resource.h>,
and cleans up some perhaps-unportable code associated with use of that
include file and getrlimit().
This commit is contained in:
Tom Lane
2006-10-07 19:25:29 +00:00
parent 1c160291ef
commit 71a6f8b85b
9 changed files with 136 additions and 52 deletions
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42
doc/src/sgml/config.sgml
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@@ -1,4 +1,4 @@
<!-- $PostgreSQL: pgsql/doc/src/sgml/config.sgml,v 1.89 2006/09/25 22:12:24 tgl Exp $ -->
<!-- $PostgreSQL: pgsql/doc/src/sgml/config.sgml,v 1.90 2006/10/07 19:25:28 tgl Exp $ -->
<chapter Id="runtime-config">
<title>Server Configuration</title>
@@ -846,14 +846,22 @@ SET ENABLE_SEQSCAN TO OFF;
equivalent), less a safety margin of a megabyte or so. The safety
margin is needed because the stack depth is not checked in every
routine in the server, but only in key potentially-recursive routines
such as expression evaluation. Setting the parameter higher than
the actual kernel limit will mean that a runaway recursive function
can crash an individual backend process. The default setting is
such as expression evaluation. The default setting is
2048 KB (two megabytes), which is conservatively small and unlikely
to risk crashes. However, it may be too small to allow execution
of complex functions.
Only superusers can change this setting.
</para>
<para>
Setting <varname>max_stack_depth</> higher than
the actual kernel limit will mean that a runaway recursive function
can crash an individual backend process. On platforms where
<productname>PostgreSQL</productname> can determine the kernel limit,
it will not let you set this variable to an unsafe value. However,
not all platforms provide the information, so caution is recommended
in selecting a value.
</para>
</listitem>
</varlistentry>
@@ -2173,19 +2181,6 @@ SELECT * FROM parent WHERE key = 2400;
</listitem>
</varlistentry>
<varlistentry id="guc-gin-fuzzy-search-limit" xreflabel="gin_fuzzy_search_limit">
<term><varname>gin_fuzzy_search_limit</varname> (<type>integer</type>)</term>
<indexterm>
<primary><varname>gin_fuzzy_search_limit</> configuration parameter</primary>
</indexterm>
<listitem>
<para>
Soft upper limit of the size of the set returned by GIN index. For more
information see <xref linkend="gin-tips">.
</para>
</listitem>
</varlistentry>
</variablelist>
</sect2>
</sect1>
@@ -3718,6 +3713,19 @@ dynamic_library_path = 'C:\tools\postgresql;H:\my_project\lib;$libdir'
</para>
</listitem>
</varlistentry>
<varlistentry id="guc-gin-fuzzy-search-limit" xreflabel="gin_fuzzy_search_limit">
<term><varname>gin_fuzzy_search_limit</varname> (<type>integer</type>)</term>
<indexterm>
<primary><varname>gin_fuzzy_search_limit</> configuration parameter</primary>
</indexterm>
<listitem>
<para>
Soft upper limit of the size of the set returned by GIN index. For more
information see <xref linkend="gin-tips">.
</para>
</listitem>
</varlistentry>
<varlistentry id="guc-local-preload-libraries" xreflabel="local_preload_libraries">
<term><varname>local_preload_libraries</varname> (<type>string</type>)</term>