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    <title>MongoDB Jira</title>
    <link>https://jira.mongodb.org</link>
    <description>This file is an XML representation of an issue</description>
    <language>en-us</language>    <build-info>
        <version>9.7.1</version>
        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-32894] Disallow creation of `system.indexes`</title>
                <link>https://jira.mongodb.org/browse/SERVER-32894</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Inserting into `system.indexes` is disallowed, but an explicitly create collection command goes through. This has some interesting, problematic side-effects. For example:&lt;/p&gt;
&lt;ol&gt;
	&lt;li&gt;Creating a real collection on the KVStorageEngine.&lt;/li&gt;
	&lt;li&gt;Replicating with a create collection oplog entry.&lt;/li&gt;
	&lt;li&gt;Dropping a database skips dropping the collection.&lt;/li&gt;
	&lt;li&gt;Others? &lt;tt&gt;system.indexes&lt;/tt&gt; is often treated specially in the code.&lt;/li&gt;
&lt;/ol&gt;


&lt;p&gt;Particularly between 2 and 3, this prevents us from properly verifying a legally ordered sequence of updates on all document in WiredTiger.&lt;/p&gt;

&lt;p&gt;I would imagine this is also possible on earlier versions, but I haven&apos;t verified.&lt;/p&gt;</description>
                <environment></environment>
        <key id="487317">SERVER-32894</key>
            <summary>Disallow creation of `system.indexes`</summary>
                <type id="1" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14703&amp;avatarType=issuetype">Bug</type>
                                            <priority id="3" iconUrl="https://jira.mongodb.org/images/icons/priorities/major.svg">Major - P3</priority>
                        <status id="6" iconUrl="https://jira.mongodb.org/images/icons/statuses/closed.png" description="The issue is considered finished, the resolution is correct. Issues which are closed can be reopened.">Closed</status>
                    <statusCategory id="3" key="done" colorName="success"/>
                                    <resolution id="13201">Fixed</resolution>
                                        <assignee username="tess.avitabile@mongodb.com">Tess Avitabile</assignee>
                                    <reporter username="daniel.gottlieb@mongodb.com">Daniel Gottlieb</reporter>
                        <labels>
                    </labels>
                <created>Thu, 25 Jan 2018 15:55:02 +0000</created>
                <updated>Mon, 30 Oct 2023 23:08:59 +0000</updated>
                            <resolved>Thu, 8 Feb 2018 19:52:10 +0000</resolved>
                                                    <fixVersion>3.7.2</fixVersion>
                                    <component>Storage</component>
                                        <votes>0</votes>
                                    <watches>7</watches>
                                                                                                                <comments>
                            <comment id="1799904" author="xgen-internal-githook" created="Thu, 8 Feb 2018 19:51:48 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;email&apos;: &apos;tess.avitabile@mongodb.com&apos;, &apos;name&apos;: &apos;Tess Avitabile&apos;, &apos;username&apos;: &apos;tessavitabile&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-32894&quot; title=&quot;Disallow creation of `system.indexes`&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-32894&quot;&gt;&lt;del&gt;SERVER-32894&lt;/del&gt;&lt;/a&gt; Disallow creation of system.indexes&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/d337da259248c785f4014b565742300eb08ecd4f&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/d337da259248c785f4014b565742300eb08ecd4f&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1785402" author="tess.avitabile" created="Thu, 25 Jan 2018 21:46:01 +0000"  >&lt;p&gt;Ah, though I suppose that could affect the ability to create an index by performing an insert on &lt;tt&gt;system.indexes&lt;/tt&gt;. I&apos;ll reconsider...&lt;/p&gt;</comment>
                            <comment id="1785334" author="tess.avitabile" created="Thu, 25 Jan 2018 20:59:06 +0000"  >&lt;p&gt;This is not an issue for &lt;tt&gt;rename&lt;/tt&gt; due to the following &lt;a href=&quot;https://github.com/mongodb/mongo/blob/f6d5c6acf7481833b0e0cd579f9145e4f21b0ace/src/mongo/db/commands/rename_collection_cmd.cpp#L142&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;check&lt;/a&gt;:&lt;/p&gt;
&lt;p/&gt;
&lt;div id=&quot;syntaxplugin&quot; class=&quot;syntaxplugin&quot; style=&quot;border: 1px dashed #bbb; border-radius: 5px !important; overflow: auto; max-height: 30em;&quot;&gt;
&lt;table cellspacing=&quot;0&quot; cellpadding=&quot;0&quot; border=&quot;0&quot; width=&quot;100%&quot; style=&quot;font-size: 1em; line-height: 1.4em !important; font-weight: normal; font-style: normal; color: black;&quot;&gt;
		&lt;tbody &gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
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					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;  margin-top: 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;        if (source.isSystemDotIndexes() || target.isSystemDotIndexes()) {&lt;/span&gt;&lt;/pre&gt;
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				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;            errmsg = &quot;renaming system.indexes is not allowed&quot;;&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
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				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;            return false;&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
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				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   margin-bottom: 10px;  width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;        }&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
			&lt;/tbody&gt;
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&lt;/div&gt;
&lt;p/&gt;
&lt;p&gt;I think we could prevent users from creating the namespace &lt;tt&gt;system.indexes&lt;/tt&gt; by removing it from &lt;a href=&quot;https://github.com/mongodb/mongo/blob/f6d5c6acf7481833b0e0cd579f9145e4f21b0ace/src/mongo/db/ops/insert.cpp#L225&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;this whitelist&lt;/a&gt; of system namespaces users are allowed to create.&lt;/p&gt;</comment>
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            <issuekey id="487290">SERVER-32893</issuekey>
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