129 lines
7.2 KiB
HTML
129 lines
7.2 KiB
HTML
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<?xml version="1.0" encoding="UTF-8"?>
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<!DOCTYPE html
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PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
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<html lang="en-us" xml:lang="en-us">
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<head>
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<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
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<meta name="security" content="public" />
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<meta http-equiv="PICS-Label" content='(PICS-1.1 "http://www.icra.org/ratingsv02.html" l gen true r (cz 1 lz 1 nz 1 oz 1 vz 1) "http://www.rsac.org/ratingsv01.html" l gen true r (n 0 s 0 v 0 l 0) "http://www.classify.org/safesurf/" l gen true r (SS~~000 1))' />
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<meta name="DC.Type" content="concept" />
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<meta name="DC.Title" content="Share memory control" />
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<meta name="abstract" content="This system value determines whether or not to allow access to shared memory, or use mapped memory stream files." />
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<meta name="description" content="This system value determines whether or not to allow access to shared memory, or use mapped memory stream files." />
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<meta name="DC.Relation" scheme="URI" content="rzamvgensecsysval.htm" />
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<meta name="copyright" content="(C) Copyright IBM Corporation 2006" />
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<meta name="DC.Rights.Owner" content="(C) Copyright IBM Corporation 2006" />
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<meta name="DC.Format" content="XHTML" />
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<meta name="DC.Identifier" content="sharemem" />
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<meta name="DC.Language" content="en-us" />
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<!-- All rights reserved. Licensed Materials Property of IBM -->
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<!-- US Government Users Restricted Rights -->
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<!-- GSA ADP Schedule Contract with IBM Corp. -->
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<link rel="stylesheet" type="text/css" href="./ibmdita.css" />
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<link rel="stylesheet" type="text/css" href="./ic.css" />
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<title>Share memory control</title>
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</head>
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<body id="sharemem"><a name="sharemem"><!-- --></a>
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<!-- Java sync-link --><script language="Javascript" src="../rzahg/synch.js" type="text/javascript"></script>
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<h1 class="topictitle1">Share memory control</h1>
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<div><p>This system value determines whether or not to allow access to
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shared memory, or use mapped memory stream files.</p>
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<p>This controls how users, particularly application developers, use application
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programmable interfaces (APIs) that deal with sharing memory or mapped memory
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stream files. Your environment may contain applications, each running different
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jobs, but sharing pointers within these applications. Using these APIs provides
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for better application performance and streamlines the application development
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by allowing shared memory and stream files among these different applications
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and jobs. However, use of these APIs could potentially pose a risk to your
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system and assets. A programmer would have write access and could add, change,
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and delete entries in the shared memory or stream file.</p>
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<p>See <a href="#sharemem__quickref">Table 2</a> for an overview
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of the shared memory control system value. </p>
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<p>The following table provides a description of each of the possible settings
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for this system value:</p>
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<div class="tablenoborder"><table cellpadding="4" cellspacing="0" summary="" frame="border" border="1" rules="all"><caption>Table 1. Possible values for the share memory control system
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value</caption><thead align="left"><tr valign="bottom"><th valign="bottom" id="d0e30">iSeries™ Navigator </th>
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<th valign="bottom" id="d0e34">Character-based interface</th>
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<th valign="bottom" id="d0e36">Description</th>
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</tr>
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</thead>
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<tbody><tr><td valign="top" headers="d0e30 ">Deselected</td>
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<td valign="top" headers="d0e34 ">0 (No)</td>
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<td valign="top" headers="d0e36 ">Users cannot use shared memory or use mapped memory
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that has write capability. Setting this value prohibits users and programmers
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from using shared memory APIs, or mapped memory objects that have write capability.
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Use this value in environments with higher security requirements.</td>
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</tr>
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<tr><td valign="top" headers="d0e30 ">Selected</td>
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<td valign="top" headers="d0e34 ">1 (Yes)</td>
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<td valign="top" headers="d0e36 ">Users can use shared memory, or use mapped memory that
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has write capability. <span>Setting this value allows users and programmers
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the ability to add, change, and delete entries in the shared memory or stream
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files.</span></td>
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</tr>
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</tbody>
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</table>
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</div>
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<p><span class="uicontrol">Relationship to security policy</span></p>
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<p>In terms of your security policy, you need to weigh the need of application
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performance with your need for security. If your company has applications
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that use shared memory you should consider allowing programmers to use these
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APIs. It makes application programming easier and more cost effective. However,
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if your environment needs stricter security, it is recommended to limit this
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capacity. </p>
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<div class="p">
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<div class="tablenoborder"><a name="sharemem__quickref"><!-- --></a><table cellpadding="4" cellspacing="0" summary="" id="sharemem__quickref" frame="border" border="1" rules="all"><caption>Table 2. Quick reference. Provides
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overview of the shared memory control system value.</caption><thead align="left"><tr valign="bottom"><th valign="bottom" id="d0e71">iSeries Navigator name</th>
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<th valign="bottom" id="d0e75">Allow use of shared or mapped memory with write capability</th>
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</tr>
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</thead>
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<tbody><tr><td valign="top" headers="d0e71 ">Character-based interface name</td>
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<td valign="top" headers="d0e75 ">QSHRMEMCTL</td>
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</tr>
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<tr><td valign="top" headers="d0e71 ">Authority</td>
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<td valign="top" headers="d0e75 "><p>All object (*ALLOBJ)<br />
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Security administrator (*SECADM)</p>
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<div class="note"><span class="notetitle">Note:</span> The Security Officer (QSECOFR) user profile is shipped with
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these authorities. </div>
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</td>
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</tr>
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<tr><td valign="top" headers="d0e71 ">How to access</td>
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<td valign="top" headers="d0e75 "><div class="p"><strong>iSeries Navigator</strong><ol><li>Expand <span class="menucascade"><span class="uicontrol">Security</span> > <span class="uicontrol">Policies</span></span>.</li>
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<li>Right click <span class="uicontrol">Security Policy</span> and select <span class="uicontrol">Properties</span>.</li>
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<li>On the <span class="uicontrol">Shared Memory</span> page, you will find this option.</li>
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</ol>
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</div>
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<div class="p"><span class="uicontrol">Character-based interface</span><ol><li>In the character-based interface, type <samp class="codeph">WRKSYSVAL QSHRMEMCTL</samp>.</li>
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</ol>
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</div>
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</td>
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</tr>
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<tr><td valign="top" headers="d0e71 ">Changes take effect</td>
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<td valign="top" headers="d0e75 ">Immediately</td>
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</tr>
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<tr><td valign="top" headers="d0e71 ">Default value</td>
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<td valign="top" headers="d0e75 ">Selected (1)</td>
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</tr>
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<tr><td valign="top" headers="d0e71 ">Recommended values</td>
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<td valign="top" headers="d0e75 "> </td>
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</tr>
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<tr><td valign="top" headers="d0e71 "><a href="rzamvlockdown.htm">Lockable</a></td>
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<td valign="top" headers="d0e75 ">Yes</td>
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</tr>
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</tbody>
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</table>
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</div>
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</div>
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<p>For more in-depth information about this security value, see Chapter 3, <span class="q">"Security
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System Values"</span> in <a href="../books/sc415302.pdf" target="_blank">Security Reference</a>. </p>
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</div>
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<div>
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<div class="familylinks">
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<div class="parentlink"><strong>Parent topic:</strong> <a href="rzamvgensecsysval.htm" title="General security system values provide the cornerstone for your security policy.">General security system values</a></div>
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</div>
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</div>
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</body>
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</html>
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