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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>
    </build-info>


<item>
            <title>[SERVER-22705] MMAPv1 BTree buckets depend on illegal-in-C++ flexible array members</title>
                <link>https://jira.mongodb.org/browse/SERVER-22705</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;The flexible array member trick is not valid in C++, however the MMAPv1 subsystem makes extensive use of it to define BTree buckets:&lt;/p&gt;

&lt;p&gt;&lt;a href=&quot;https://github.com/mongodb/mongo/blob/9299908ecce87efded5f16980824490b8933678e/src/mongo/db/storage/mmap_v1/btree/btree_ondisk.h#L177&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/blob/9299908ecce87efded5f16980824490b8933678e/src/mongo/db/storage/mmap_v1/btree/btree_ondisk.h#L177&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;This causes UBSAN to complain about access beyond the end of the array:&lt;/p&gt;

&lt;p/&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;src/mongo/db/storage/mmap_v1/btree/btree_logic.cpp:254:25: runtime error: index 8145 out of bounds for type &apos;char [4]&apos;&lt;/span&gt;&lt;/pre&gt;
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						&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;    #0 0x6ab747 in mongo::BtreeLogic&amp;lt;mongo::BtreeLayoutV1&amp;gt;::dataAt(mongo::BtreeBucketV1*, short) /home/andrew/Documents/10gen/dev/src/mongodb/src/mongo/db/storage/mmap_v1/btree/btree_logic.cpp:254:12&lt;/span&gt;&lt;/pre&gt;
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					&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;    #1 0x6ab747 in mongo::BtreeLogic&amp;lt;mongo::BtreeLayoutV1&amp;gt;::pushBack(mongo::BtreeBucketV1*, mongo::DiskLoc, mongo::KeyV1 const&amp;amp;, mongo::DiskLoc) /home/andrew/Documents/10gen/dev/src/mongodb/src/mongo/db/storage/mmap_v1/btree/btree_logic.cpp:412&lt;/span&gt;&lt;/pre&gt;
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					&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;    #2 0x6aac42 in mongo::BtreeLogic&amp;lt;mongo::BtreeLayoutV1&amp;gt;::Builder::addKey(mongo::BSONObj const&amp;amp;, mongo::DiskLoc const&amp;amp;) /home/andrew/Documents/10gen/dev/src/mongodb/src/mongo/db/storage/mmap_v1/btree/btree_logic.cpp:142:10&lt;/span&gt;&lt;/pre&gt;
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					&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;    #3 0x69274b in mongo::(anonymous namespace)::BtreeBuilderInterfaceImpl&amp;lt;mongo::BtreeLayoutV1&amp;gt;::addKey(mongo::BSONObj const&amp;amp;, mongo::RecordId const&amp;amp;) /home/andrew/Documents/10gen/dev/src/mongodb/src/mongo/db/storage/mmap_v1/btree/btree_interface.cpp:54:16&lt;/span&gt;&lt;/pre&gt;
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						&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;    #4 0x709285 in mongo::UnitTest__SortedDataInterface__BuilderAddKey::_doTest() /home/andrew/Documents/10gen/dev/src/mongodb/src/mongo/db/storage/sorted_data_interface_test_bulkbuilder.cpp:55:9&lt;/span&gt;&lt;/pre&gt;
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					&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;    #5 0x7cb778 in mongo::unittest::Test::run() /home/andrew/Documents/10gen/dev/src/mongodb/src/mongo/unittest/unittest.cpp:147:9&lt;/span&gt;&lt;/pre&gt;
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					&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;    #6 0x70fb73 in void mongo::unittest::Suite::runTestObject&amp;lt;mongo::UnitTest__SortedDataInterface__BuilderAddKey&amp;gt;() /home/andrew/Documents/10gen/dev/src/mongodb/src/mongo/unittest/unittest.h:405:9&lt;/span&gt;&lt;/pre&gt;
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						&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;    #7 0x7ccf0d in mongo::unittest::TestHolder::run() const /home/andrew/Documents/10gen/dev/src/mongodb/src/mongo/unittest/unittest.h:257:9&lt;/span&gt;&lt;/pre&gt;
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						&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;    #8 0x7ccf0d in mongo::unittest::Suite::run(std::string const&amp;amp;, int) /home/andrew/Documents/10gen/dev/src/mongodb/src/mongo/unittest/unittest.cpp:263&lt;/span&gt;&lt;/pre&gt;
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						&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;    #9 0x7ce3d7 in mongo::unittest::Suite::run(std::vector&amp;lt;std::string, std::allocator&amp;lt;std::string&amp;gt; &amp;gt; const&amp;amp;, std::string const&amp;amp;, int) /home/andrew/Documents/10gen/dev/src/mongodb/src/mongo/unittest/unittest.cpp:321:27&lt;/span&gt;&lt;/pre&gt;
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					&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;    #10 0x7d3957 in main /home/andrew/Documents/10gen/dev/src/mongodb/src/mongo/unittest/unittest_main.cpp:40:12&lt;/span&gt;&lt;/pre&gt;
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					&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;    #12 0x623dd8 in _start (/home/andrew/Documents/10gen/dev/src/mongodb/build/optdebug/mongo/db/storage/mmap_v1/btree_interface_test+0x623dd8)&lt;/span&gt;&lt;/pre&gt;
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&lt;p/&gt;
</description>
                <environment></environment>
        <key id="266254">SERVER-22705</key>
            <summary>MMAPv1 BTree buckets depend on illegal-in-C++ flexible array members</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="9">Done</resolution>
                                        <assignee username="backlog-server-execution">Backlog - Storage Execution Team</assignee>
                                    <reporter username="andrew.morrow@mongodb.com">Andrew Morrow</reporter>
                        <labels>
                            <label>undefined-sanitizer</label>
                    </labels>
                <created>Wed, 17 Feb 2016 20:13:04 +0000</created>
                <updated>Tue, 6 Dec 2022 04:33:02 +0000</updated>
                            <resolved>Fri, 14 Sep 2018 19:44:54 +0000</resolved>
                                                                    <component>MMAPv1</component>
                                        <votes>0</votes>
                                    <watches>6</watches>
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