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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>[CSHARP-4213] CryptClient.StartDecryptionContext pins buffer but never unpins</title>
                <link>https://jira.mongodb.org/browse/CSHARP-4213</link>
                <project id="10041" key="CSHARP">C# Driver</project>
                    <description>&lt;p&gt;The following code is located in &lt;tt&gt;CryptClient.cs&lt;/tt&gt;:&lt;/p&gt;

&lt;p/&gt;
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&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;
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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;public CryptContext StartDecryptionContext(byte[] buffer)&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;{&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;    ContextSafeHandle handle = Library.mongocrypt_ctx_new(_handle);&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;                                                                                                  &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;    GCHandle gch = GCHandle.Alloc(buffer, GCHandleType.Pinned);&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;                                                                                                  &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;    unsafe&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;    {&lt;/span&gt;&lt;/pre&gt;
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				&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;        fixed (byte* p = buffer)&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;        {&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;            IntPtr ptr = (IntPtr)p;&lt;/span&gt;&lt;/pre&gt;
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				&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;            using (PinnedBinary pinned = new PinnedBinary(ptr, (uint)buffer.Length))&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;            {&lt;/span&gt;&lt;/pre&gt;
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		&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;                handle.Check(_status, Library.mongocrypt_ctx_decrypt_init(handle, pinned.Handle));&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;            }&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;        }&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;    }&lt;/span&gt;&lt;/pre&gt;
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		&lt;/tr&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;                                                                                                  &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;    return new CryptContext(handle);&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;}&lt;/span&gt;&lt;/pre&gt;
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&lt;p/&gt;

&lt;p&gt;Note the 5th line where &lt;tt&gt;gch&lt;/tt&gt; is allocated. The allocated &lt;tt&gt;GCHandle&lt;/tt&gt; is a &lt;tt&gt;struct&lt;/tt&gt; that represents a pointer that can be passed to unmanaged code. You must explicitly free it. It has no finalizer or &lt;tt&gt;Dispose&lt;/tt&gt; method. If you allocate it pinned (as done here), it acts as a rooted reference which will keep the referenced memory (and anything it points to) alive indefinitely.&lt;/p&gt;

&lt;p&gt;Note that we later allocate a &lt;tt&gt;PinnedBinary&lt;/tt&gt;, which implements &lt;tt&gt;IDisposable&lt;/tt&gt; and allows us to pin the buffer to be passed to the unmanaged code and correctly unpins it upon return.&lt;/p&gt;

&lt;p&gt;Based on my review of the code, the 5th line allocating &lt;tt&gt;gch&lt;/tt&gt; is dead code that should be deleted. Not only is it dead code, it is responsible for keeping alive any &lt;tt&gt;System.Byte[]&lt;/tt&gt; buffer passed into this method. Because we attempt to decrypt any response from the server (in case there are encrypted fields in the response), this results in a slow build-up of &lt;tt&gt;System.Byte[]&lt;/tt&gt; objects when CSFLE is enabled for the .NET/C# Driver.&lt;/p&gt;</description>
                <environment></environment>
        <key id="2070041">CSHARP-4213</key>
            <summary>CryptClient.StartDecryptionContext pins buffer but never unpins</summary>
                <type id="1" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14703&amp;avatarType=issuetype">Bug</type>
                                            <priority id="2" iconUrl="https://jira.mongodb.org/images/icons/priorities/critical.svg">Critical - P2</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="dmitry.lukyanov@mongodb.com">Dmitry Lukyanov</assignee>
                                    <reporter username="james.kovacs@mongodb.com">James Kovacs</reporter>
                        <labels>
                            <label>FLE</label>
                    </labels>
                <created>Wed, 15 Jun 2022 21:16:37 +0000</created>
                <updated>Sat, 28 Oct 2023 11:47:11 +0000</updated>
                            <resolved>Fri, 17 Jun 2022 21:01:11 +0000</resolved>
                                                    <fixVersion>2.16.1</fixVersion>
                                    <component>Field Level Encryption</component>
                                        <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="4630142" author="xgen-internal-githook" created="Tue, 21 Jun 2022 18:36:51 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Dmitry Lukyanov&apos;, &apos;email&apos;: &apos;dmitry.lukyanov@mongodb.com&apos;, &apos;username&apos;: &apos;DmitryLukyanov&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/CSHARP-4213&quot; title=&quot;CryptClient.StartDecryptionContext pins buffer but never unpins&quot; class=&quot;issue-link&quot; data-issue-key=&quot;CSHARP-4213&quot;&gt;&lt;del&gt;CSHARP-4213&lt;/del&gt;&lt;/a&gt;: CryptClient.StartDecryptionContext pins buffer but never unpins. (#824)&lt;br/&gt;
Branch: v2.16.x&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo-csharp-driver/commit/d2106d681393613ceb4171b4b6c9425d9cc3b006&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo-csharp-driver/commit/d2106d681393613ceb4171b4b6c9425d9cc3b006&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="4624961" author="xgen-internal-githook" created="Fri, 17 Jun 2022 21:00:43 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Dmitry Lukyanov&apos;, &apos;email&apos;: &apos;dmitry.lukyanov@mongodb.com&apos;, &apos;username&apos;: &apos;DmitryLukyanov&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/CSHARP-4213&quot; title=&quot;CryptClient.StartDecryptionContext pins buffer but never unpins&quot; class=&quot;issue-link&quot; data-issue-key=&quot;CSHARP-4213&quot;&gt;&lt;del&gt;CSHARP-4213&lt;/del&gt;&lt;/a&gt;: CryptClient.StartDecryptionContext pins buffer but never unpins. (#824)&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo-csharp-driver/commit/887cb0fc4dfae07bee7f2d58bdd87a1146cb019c&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo-csharp-driver/commit/887cb0fc4dfae07bee7f2d58bdd87a1146cb019c&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="4624794" author="xgen-internal-githook" created="Fri, 17 Jun 2022 20:00:58 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Dmitry Lukyanov&apos;, &apos;email&apos;: &apos;dmitry.lukyanov@mongodb.com&apos;, &apos;username&apos;: &apos;DmitryLukyanov&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/CSHARP-4213&quot; title=&quot;CryptClient.StartDecryptionContext pins buffer but never unpins&quot; class=&quot;issue-link&quot; data-issue-key=&quot;CSHARP-4213&quot;&gt;&lt;del&gt;CSHARP-4213&lt;/del&gt;&lt;/a&gt;: CryptClient.StartDecryptionContext pins buffer but never unpins. (#372)&lt;br/&gt;
Branch: csharp-v1.5.3_release&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/libmongocrypt/commit/34bcccdd8b760235e866193150c9dfb6b2d76778&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/libmongocrypt/commit/34bcccdd8b760235e866193150c9dfb6b2d76778&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="4624598" author="xgen-internal-githook" created="Fri, 17 Jun 2022 18:35:05 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Dmitry Lukyanov&apos;, &apos;email&apos;: &apos;dmitry.lukyanov@mongodb.com&apos;, &apos;username&apos;: &apos;DmitryLukyanov&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/CSHARP-4213&quot; title=&quot;CryptClient.StartDecryptionContext pins buffer but never unpins&quot; class=&quot;issue-link&quot; data-issue-key=&quot;CSHARP-4213&quot;&gt;&lt;del&gt;CSHARP-4213&lt;/del&gt;&lt;/a&gt;: CryptClient.StartDecryptionContext pins buffer but never unpins. (#372)&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/libmongocrypt/commit/a1e585d5c40f8f209b006621f218ada93a6d68c9&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/libmongocrypt/commit/a1e585d5c40f8f209b006621f218ada93a6d68c9&lt;/a&gt;&lt;/p&gt;</comment>
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