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    <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-3633] three/four potential seg faults for non in mem yielding</title>
                <link>https://jira.mongodb.org/browse/SERVER-3633</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;See QA-10&lt;/p&gt;

&lt;p&gt;For #1 right now I think we just touch the beginning of the record not the whole thing in all the cases where touch() gets called, but it is a latent issue.  Same may be true for #2.&lt;/p&gt;

&lt;p&gt;1) Record::touch can read one byte past the end of a record if data == end, potentially this can cause a seg fault unless we always have some padding in extents which I haven&apos;t seen&lt;br/&gt;
2) In update.cpp and clientcursor.cpp we use mmmutex to ensure a Record* doesn&apos;t get unmapped. However, this does not prevent the memory pointed at by the Record* from being changed. If the memory is changed so that the pointer no longer points to the beginning of a Record, it could interpret an invalid value as lengthWithHeaders and then read an invalid length when calling touch() causing a seg fault. &lt;br/&gt;
3) In update.cpp, when we yield for an update by id, the &apos;nsdt&apos; and &apos;d&apos; pointers may be invalidated causing a seg fault. &lt;/p&gt;</description>
                <environment></environment>
        <key id="21117">SERVER-3633</key>
            <summary>three/four potential seg faults for non in mem yielding</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="eliot">Eliot Horowitz</assignee>
                                    <reporter username="aaron">Aaron Staple</reporter>
                        <labels>
                    </labels>
                <created>Wed, 17 Aug 2011 18:40:27 +0000</created>
                <updated>Mon, 11 Jul 2016 18:33:59 +0000</updated>
                            <resolved>Mon, 29 Aug 2011 18:39:25 +0000</resolved>
                                                    <fixVersion>2.0.0-rc1</fixVersion>
                                                        <votes>0</votes>
                                    <watches>1</watches>
                                                                                                                <comments>
                            <comment id="51269" author="auto" created="Mon, 29 Aug 2011 18:39:53 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;login&apos;: u&apos;erh&apos;, u&apos;name&apos;: u&apos;Eliot Horowitz&apos;, u&apos;email&apos;: u&apos;eliot@10gen.com&apos;}
&lt;p&gt;Message: fix yield with disk issue in update.cpp &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-3633&quot; title=&quot;three/four potential seg faults for non in mem yielding&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-3633&quot;&gt;&lt;del&gt;SERVER-3633&lt;/del&gt;&lt;/a&gt;&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/cba958b22301f26c9f29a37a533eb9a31d7c77b8&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/cba958b22301f26c9f29a37a533eb9a31d7c77b8&lt;/a&gt;&lt;/p&gt;</comment>
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                                        <issuelink>
            <issuekey id="21634">SERVER-3711</issuekey>
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            <issuekey id="14750">SERVER-2563</issuekey>
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