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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-51444] BSONElement&apos;s buffer in IndexEntryInfo used for validation is unowned and unsafe to access after cursor advances</title>
                <link>https://jira.mongodb.org/browse/SERVER-51444</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;The second phase of validation &lt;a href=&quot;https://github.com/mongodb/mongo/blob/f1cc034d8d11d8a37101db33996026252e92bf98/src/mongo/db/catalog/index_consistency.cpp#L309-L323&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;saves a BSONElement&lt;/a&gt; that uses a shared buffer which is unsafe to use once the underlying memory is free after the cursor is repositioned.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1507495">SERVER-51444</key>
            <summary>BSONElement&apos;s buffer in IndexEntryInfo used for validation is unowned and unsafe to access after cursor advances</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="gregory.wlodarek@mongodb.com">Gregory Wlodarek</assignee>
                                    <reporter username="gregory.wlodarek@mongodb.com">Gregory Wlodarek</reporter>
                        <labels>
                    </labels>
                <created>Thu, 8 Oct 2020 16:58:57 +0000</created>
                <updated>Sun, 29 Oct 2023 22:02:12 +0000</updated>
                            <resolved>Fri, 9 Oct 2020 01:14:54 +0000</resolved>
                                                    <fixVersion>4.9.0</fixVersion>
                                    <component>Storage</component>
                                        <votes>0</votes>
                                    <watches>1</watches>
                                                                                                                <comments>
                            <comment id="3436969" author="daniel.gottlieb@10gen.com" created="Fri, 9 Oct 2020 14:36:12 +0000"  >&lt;p&gt;Ah nice, the BF was generated only a few days after the commit which exposed the bug. That&apos;s reasonable to me!&lt;/p&gt;</comment>
                            <comment id="3436868" author="gregory.wlodarek" created="Fri, 9 Oct 2020 14:00:33 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=daniel.gottlieb&quot; class=&quot;user-hover&quot; rel=&quot;daniel.gottlieb&quot;&gt;daniel.gottlieb&lt;/a&gt;&#160;this regression was introduced not too long ago in the master branch only (I declined the backport after realizing this) by &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-49103&quot; title=&quot;Validate repair mode should fix up missing and extra index entries&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-49103&quot;&gt;&lt;del&gt;SERVER-49103&lt;/del&gt;&lt;/a&gt;. When &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-47681&quot; title=&quot;Background validation uses the kNoOverlap read source instead of kAllDurableSnapshot to prevent us from having to take the PBWM lock on secondaries&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-47681&quot;&gt;&lt;del&gt;SERVER-47681&lt;/del&gt;&lt;/a&gt; went in it made background validation yield its cursors, in addition to &lt;a href=&quot;https://github.com/mongodb/mongo/blob/3027686e373b074bd4c3acca01b19f7173937cf2/src/mongo/db/storage/wiredtiger/wiredtiger_recovery_unit.cpp#L348-L381&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;refreshing its storage snapshot&lt;/a&gt;. I believe a combination of those two exposed this issue. In addition, this affects the second phase of validation only, which is a harder code path to get to as you need to have corruption present &lt;img class=&quot;emoticon&quot; src=&quot;https://jira.mongodb.org/images/icons/emoticons/smile.png&quot; height=&quot;16&quot; width=&quot;16&quot; align=&quot;absmiddle&quot; alt=&quot;&quot; border=&quot;0&quot;/&gt;&lt;/p&gt;</comment>
                            <comment id="3436857" author="daniel.gottlieb@10gen.com" created="Fri, 9 Oct 2020 13:51:52 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=gregory.wlodarek&quot; class=&quot;user-hover&quot; rel=&quot;gregory.wlodarek&quot;&gt;gregory.wlodarek&lt;/a&gt; do you know when this bug was introduced? We took some measures a while back to better catch use-after-free errors specifically for when MDB is referencing memory pinned by a WT cursor. If this bug has been around for a long while, I&apos;m curious if we know why this wasn&apos;t caught sooner. There may be a gap in the guard rails we put in.&lt;/p&gt;</comment>
                            <comment id="3435747" author="xgen-internal-githook" created="Thu, 8 Oct 2020 22:53:28 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Gregory Wlodarek&apos;, &apos;email&apos;: &apos;gregory.wlodarek@mongodb.com&apos;, &apos;username&apos;: &apos;GWlodarek&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-51444&quot; title=&quot;BSONElement&amp;#39;s buffer in IndexEntryInfo used for validation is unowned and unsafe to access after cursor advances&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-51444&quot;&gt;&lt;del&gt;SERVER-51444&lt;/del&gt;&lt;/a&gt; BSONElement&apos;s buffer in IndexEntryInfo used for validation is unowned and unsafe to access after cursor advances&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/5f15abcb11e7abddd49e58616fe16e992c5c81d9&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/5f15abcb11e7abddd49e58616fe16e992c5c81d9&lt;/a&gt;&lt;/p&gt;</comment>
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