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    <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-83100] [CQF] Use-after-free in aggregation with parameterization enabled</title>
                <link>https://jira.mongodb.org/browse/SERVER-83100</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;An ASAN run of jstests/cqf/analyze/ce_sample_rate.js reveals a use-after-free with parameterization enabled.&lt;/p&gt;

&lt;p&gt;Binding of an SBE plan uses an &lt;a href=&quot;https://github.com/10gen/mongo/blob/18fd3452cd82c1ccc8e8e06e34d10eaecce69454/src/mongo/db/query/bind_input_params.cpp#L282-L291&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;unowned view into the MatchExpression&lt;/a&gt; to populate the value of query parameters for operands of comparison expressions. In the case of creating a PlanExecutor via Bonsai, the pipeline owning the MatchExpression &lt;a href=&quot;https://github.com/10gen/mongo/blob/18fd3452cd82c1ccc8e8e06e34d10eaecce69454/src/mongo/db/commands/run_aggregate.cpp#L1398&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;goes out of scope&lt;/a&gt; right after constructing the executor, leaving a dangling reference.&lt;/p&gt;

&lt;p&gt;The binding should either copy the data to populate the slot or the SBE PlanExecutor constructed by Bonsai needs to extend the lifetime of the MatchExpression which the slot references.&lt;/p&gt;</description>
                <environment></environment>
        <key id="2496396">SERVER-83100</key>
            <summary>[CQF] Use-after-free in aggregation with parameterization enabled</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="ben.shteinfeld@mongodb.com">Ben Shteinfeld</assignee>
                                    <reporter username="ben.shteinfeld@mongodb.com">Ben Shteinfeld</reporter>
                        <labels>
                    </labels>
                <created>Fri, 10 Nov 2023 04:57:26 +0000</created>
                <updated>Mon, 27 Nov 2023 19:57:09 +0000</updated>
                            <resolved>Tue, 14 Nov 2023 15:54:36 +0000</resolved>
                                                    <fixVersion>7.3.0-rc0</fixVersion>
                                                        <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="5879009" author="xgen-internal-githook" created="Tue, 14 Nov 2023 15:53:21 +0000"  >&lt;p&gt;Author: &lt;/p&gt;
{&apos;name&apos;: &apos;Ben Shteinfeld&apos;, &apos;email&apos;: &apos;ben.shteinfeld@mongodb.com&apos;, &apos;username&apos;: &apos;bshteinfeld&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-83100&quot; title=&quot;[CQF] Use-after-free in aggregation with parameterization enabled&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-83100&quot;&gt;&lt;del&gt;SERVER-83100&lt;/del&gt;&lt;/a&gt;: Extend Pipeline lifetime by plumbing it through to SBE PlanExecutor.&lt;/p&gt;

&lt;p&gt;This fixes a use-after-free in CQF with parameterization enabled. In the SBE stage builders codepaths for find() and agg() (and Bonsai find() codepath), the SBE PlanExecutor ends up owning the CanonicalQuery containing the MatchExpression used to generate the plan. The binding of constants to global slots for ComparisonMatchExpressions uses an unowned view of the constants. This was safe because the PlanExecutor held the MatchExpression. This is preferable to copying the constants to the slots since they can potentially be large.&lt;/p&gt;

&lt;p&gt;When we the SBE PlanExecutor is generated by Bonsai via aggregate, the MatchExpression is destroyed after the PlanExecutor is constructed but before we execute it. This leaves a dangling reference to freed memory in the PlanExecutor. We fix this by transferring ownership of the Pipeline to the PlanExecutor, so that lifetime of the MatchExpression which contains the constants is extended to that of the PlanExecutor.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/29a04e25233624d39b17f174c580cb0c588282f4&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/29a04e25233624d39b17f174c580cb0c588282f4&lt;/a&gt;&lt;/p&gt;</comment>
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            <issuekey id="2461602">SERVER-81919</issuekey>
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            <issuekey id="2494641">SERVER-82978</issuekey>
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