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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-12204] Buffer::readUTF8String in bson_validate.cpp should validate utf8</title>
                <link>https://jira.mongodb.org/browse/SERVER-12204</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Currently it does not. readCString probably should too, but at least UTF8 isn&apos;t part of it&apos;s name.&lt;/p&gt;

&lt;p&gt;Example failing test:&lt;/p&gt;
&lt;p/&gt;
&lt;div id=&quot;syntaxplugin&quot; class=&quot;syntaxplugin&quot; style=&quot;border: 1px dashed #bbb; border-radius: 5px !important; overflow: auto; max-height: 30em;&quot;&gt;
&lt;table cellspacing=&quot;0&quot; cellpadding=&quot;0&quot; border=&quot;0&quot; width=&quot;100%&quot; style=&quot;font-size: 1em; line-height: 1.4em !important; font-weight: normal; font-style: normal; color: black;&quot;&gt;
		&lt;tbody &gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&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;  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;    TEST(BSONValidateFast, InvalidUTF8) {&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&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;        BSONObj x = BSON(&quot;invalidUTF8&quot; &amp;lt;&amp;lt; &quot;\xFF&quot;); // this byte should never be in well-formed utf8.&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&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;        ASSERT_NOT_OK(validateBSON(x.objdata(), x.objsize()));&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&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;   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;    }&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
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&lt;/table&gt;
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&lt;p/&gt;</description>
                <environment></environment>
        <key id="103695">SERVER-12204</key>
            <summary>Buffer::readUTF8String in bson_validate.cpp should validate utf8</summary>
                <type id="3" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14718&amp;avatarType=issuetype">Task</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="12300">Won&apos;t Do</resolution>
                                        <assignee username="spencer.jackson@mongodb.com">Spencer Jackson</assignee>
                                    <reporter username="mathias@mongodb.com">Mathias Stearn</reporter>
                        <labels>
                            <label>platforms-re-triaged</label>
                    </labels>
                <created>Tue, 24 Dec 2013 19:55:15 +0000</created>
                <updated>Tue, 22 Sep 2020 00:00:31 +0000</updated>
                            <resolved>Tue, 17 Mar 2020 14:03:25 +0000</resolved>
                                                                    <component>Stability</component>
                                        <votes>1</votes>
                                    <watches>8</watches>
                                                                                                                <comments>
                            <comment id="2983067" author="spencer.jackson@10gen.com" created="Tue, 17 Mar 2020 14:03:25 +0000"  >&lt;p&gt;I&apos;ve had a conversation with @Geert, about how BSON validation functions in the server.&lt;br/&gt;
BSON validation ensures that the BSON is structurally well-formed, and is capable of being iterated, but doesn&apos;t validate the actual contents of non-structural elements. A minor exception for this is booleans, which are validated to be either true or false. We don&apos;t validate regexes will compile, or that strings are UTF-8 encoded. Effectively, strings are binary blobs of data, which may or may not represent human readable text in any given character set encoding. Today, servers will accept strings formed by drawing entropy from /dev/urandom. It&apos;s also plausible that strings can store human readable text encoded with Latin-1 or Shift-JIS.&lt;/p&gt;

&lt;p&gt;Enforcing UTF-8 validation of strings breaks the current behaviour of being able to save any binary input. Further, sanitizing a database which contains non-UTF-8 strings may be impossible because not all strings contain text.  Finally, extra enforcement would prevent restoration of backups taken on older servers.&lt;/p&gt;

&lt;p&gt;Generally speaking, if you put an object into the database, and request it again, you should get a byte-for-byte identical representation of the object. For example, if you insert a field which contains a particular representation of NaN, when you query that document, you will get the same NaN representation back. Character set re-encoding, performed by an explicit upgrade operation, would violate this property, and would for example change hashsums of stored documents.&lt;/p&gt;

&lt;p&gt;Distinctions between user data and MongoDB command data could be made during command parse, particularly with TypedCommand, and it is perfectly valid to enforce the properties of fields in particular known command invocations.&lt;/p&gt;</comment>
                    </comments>
                <issuelinks>
                            <issuelinktype id="10320">
                    <name>Documented</name>
                                            <outwardlinks description="documents">
                                        <issuelink>
            <issuekey id="338936">SERVER-27426</issuekey>
        </issuelink>
                            </outwardlinks>
                                                        </issuelinktype>
                            <issuelinktype id="10010">
                    <name>Duplicate</name>
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                                        <issuelink>
            <issuekey id="242092">SERVER-21753</issuekey>
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                    <name>Related</name>
                                            <outwardlinks description="related to">
                                        <issuelink>
            <issuekey id="1482605">SERVER-51083</issuekey>
        </issuelink>
            <issuelink>
            <issuekey id="390779">SERVER-29466</issuekey>
        </issuelink>
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