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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-56900] SBE sort stage may violate SBE copyOrMove contract</title>
                <link>https://jira.mongodb.org/browse/SERVER-56900</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;&lt;a href=&quot;https://github.com/mongodb/mongo/blob/f7235a380065092cacf65f15841eb98f6c52c1b4/src/mongo/db/exec/sbe/stages/sort.cpp#L168-L199&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;This&lt;/a&gt;&#160;code assumes that &apos;keys&apos; and &apos;values&apos; get moved into the sorter. However, not all implementations of the sorter&apos;s emplace() method actually move from the passed in key. See &lt;a href=&quot;https://github.com/mongodb/mongo/blob/f7235a380065092cacf65f15841eb98f6c52c1b4/src/mongo/db/sorter/sorter.h#L260-L262&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;here&lt;/a&gt;&#160;for example.&lt;/p&gt;

&lt;p&gt;&#160;&lt;/p&gt;

&lt;p&gt;Consider the following scenario:&lt;/p&gt;

&lt;p&gt;1) the sort stage is opened, and calls getNext() on its child. It calls copyOrMove() on its inAccessors, moving ownership to local variables &apos;keys&apos; and &apos;vals&apos;. Keep in mind that SBE &quot;move&quot; is non-destructive, unlike a C++ std::move(). So the inAccessors still point to the same values, just their &apos;owned&apos; flag is now false.&lt;/p&gt;

&lt;p&gt;2) The call to emplace() is made to an overload which does not move from the arguments.&lt;/p&gt;

&lt;p&gt;3) The local variables &apos;keys&apos; and &apos;vals&apos; go out of scope. The underlying memory is freed. Now the inAccessors are pointing to garbage.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1713130">SERVER-56900</key>
            <summary>SBE sort stage may violate SBE copyOrMove contract</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="13203">Gone away</resolution>
                                        <assignee username="ian.boros@mongodb.com">Ian Boros</assignee>
                                    <reporter username="ian.boros@mongodb.com">Ian Boros</reporter>
                        <labels>
                    </labels>
                <created>Wed, 12 May 2021 19:55:32 +0000</created>
                <updated>Fri, 27 Oct 2023 20:46:03 +0000</updated>
                            <resolved>Mon, 17 May 2021 21:23:32 +0000</resolved>
                                                                                        <votes>0</votes>
                                    <watches>5</watches>
                                                                                                                <comments>
                            <comment id="3778463" author="ian.boros" created="Mon, 17 May 2021 21:23:33 +0000"  >&lt;p&gt;This was fixed under &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-56869&quot; title=&quot;[SBE][ASAN jscore] heap-use-after-free during computed_projections.js&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-56869&quot;&gt;&lt;del&gt;SERVER-56869&lt;/del&gt;&lt;/a&gt;.&lt;/p&gt;</comment>
                            <comment id="3777635" author="ian.boros" created="Mon, 17 May 2021 17:49:11 +0000"  >&lt;p&gt;I have a fix for this lumped into the patch for&#160;&lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-56869&quot; title=&quot;[SBE][ASAN jscore] heap-use-after-free during computed_projections.js&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-56869&quot;&gt;&lt;del&gt;SERVER-56869&lt;/del&gt;&lt;/a&gt;. This will be closed as &quot;gone away&quot; once that is merged.&lt;/p&gt;</comment>
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            <issuekey id="1539575">SERVER-52799</issuekey>
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