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    <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-56749] Remove validation prohibiting $-prefix fields in _id</title>
                <link>https://jira.mongodb.org/browse/SERVER-56749</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;As part of&#160;&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-49117&quot; title=&quot;Remove validation for storage of documents with fieldnames containing &amp;#39;.&amp;#39; and &amp;#39;$&amp;#39; for insert and update&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-49117&quot;&gt;&lt;del&gt;SERVER-49117&lt;/del&gt;&lt;/a&gt;&#160;it was attempted to remove the validation on the _id field guaranteeing that $-prefixed fields should not be allowed:&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/995f0406d72b1a15d18b2df2d8c0afa0c4c5b774#diff-5295b5000db7b3711a31f86ebbe374e929270da88b36b20d3459c9b1d4f48d17R135-R136&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/995f0406d72b1a15d18b2df2d8c0afa0c4c5b774#diff-5295b5000db7b3711a31f86ebbe374e929270da88b36b20d3459c9b1d4f48d17R135-R136&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;However, this caused a failure in a fuzzer test:&#160;BF-21074&lt;/p&gt;


&lt;p&gt;The cause was that while this validation was removed on document inserts, when a subsequent update is made and written to the oplog, the generated update request follows a path that still enforces the validation that _id cannot contain $-prefixed fields, which results in a uassert being triggered.&lt;/p&gt;

&lt;p&gt;Relevant code: &lt;a href=&quot;https://github.com/mongodb/mongo/blob/master/src/mongo/db/repl/oplog.cpp#L1360-L1366&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/blob/master/src/mongo/db/repl/oplog.cpp#L1360-L1366&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;This path on inserts may potentially experience the same problem if we remove the validation on _id:&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/blob/b06cffeabf1d6152f3cf722efb07a144480d3917/src/mongo/db/repl/oplog.cpp#L1302-L1316&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/blob/b06cffeabf1d6152f3cf722efb07a144480d3917/src/mongo/db/repl/oplog.cpp#L1302-L1316&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;Subsequently, removing the validation on _id will need to fix the first and possibly also the second path mentioned above.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1706561">SERVER-56749</key>
            <summary>Remove validation prohibiting $-prefix fields in _id</summary>
                <type id="4" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14710&amp;avatarType=issuetype">Improvement</type>
                                            <priority id="3" iconUrl="https://jira.mongodb.org/images/icons/priorities/major.svg">Major - P3</priority>
                        <status id="10038" iconUrl="https://jira.mongodb.org/images/icons/subtask.gif" description="">Backlog</status>
                    <statusCategory id="2" key="new" colorName="default"/>
                                    <resolution id="-1">Unresolved</resolution>
                                        <assignee username="backlog-query-optimization">Backlog - Query Optimization</assignee>
                                    <reporter username="alya.berciu@mongodb.com">Alya Berciu</reporter>
                        <labels>
                    </labels>
                <created>Fri, 7 May 2021 13:23:13 +0000</created>
                <updated>Tue, 6 Dec 2022 01:19:36 +0000</updated>
                                                                                                <votes>0</votes>
                                    <watches>6</watches>
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