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        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-14936] Remove undefined behavior around BSONObj::Holder</title>
                <link>https://jira.mongodb.org/browse/SERVER-14936</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Currently, we assume that by reserving four bytes at the beginning of a buffer, we are permitted to re-interpret cast that region of memory to a BSONObj::Holder.&lt;/p&gt;

&lt;p&gt;In fact, it is only legal to reinterpret_cast a region of memory to a class type if the memory originally held a properly constructed object of that type.&lt;/p&gt;

&lt;p&gt;An additional problem is that the region of memory owned by the BSONObjBuilder may be realloc&apos;ed. We cannot place a class at the beginning of the region and assume that it will survive realloc.&lt;/p&gt;

&lt;p&gt;Instead, we should refactor the relationship between BSONObjBuilder and BSONObj so that the builder reserves but does not initialize a prefix region of appropriate size and alignment to hold a BSONObj::Holder, and then BSONObj placement new&apos;s a Holder into that region when it takes ownership of the buffer.&lt;/p&gt;</description>
                <environment></environment>
        <key id="153286">SERVER-14936</key>
            <summary>Remove undefined behavior around BSONObj::Holder</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="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="andrew.morrow@mongodb.com">Andrew Morrow</assignee>
                                    <reporter username="andrew.morrow@mongodb.com">Andrew Morrow</reporter>
                        <labels>
                    </labels>
                <created>Mon, 18 Aug 2014 14:23:13 +0000</created>
                <updated>Mon, 8 Sep 2014 17:05:30 +0000</updated>
                            <resolved>Tue, 19 Aug 2014 19:46:21 +0000</resolved>
                                                    <fixVersion>2.7.6</fixVersion>
                                    <component>Internal Code</component>
                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="695785" author="xgen-internal-githook" created="Tue, 19 Aug 2014 19:44:52 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;acmorrow&apos;, u&apos;name&apos;: u&apos;Andrew Morrow&apos;, u&apos;email&apos;: u&apos;acm@mongodb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-14936&quot; title=&quot;Remove undefined behavior around BSONObj::Holder&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-14936&quot;&gt;&lt;del&gt;SERVER-14936&lt;/del&gt;&lt;/a&gt; Give BSONObj::Holder a proper class lifecycle&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/6354bcfdd21c632c7578745bd4b794aaf16b491a&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/6354bcfdd21c632c7578745bd4b794aaf16b491a&lt;/a&gt;&lt;/p&gt;</comment>
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