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<a href="https://gitlab.com/dueno">Daiki Ueno</a>
commented on a discussion
on <a href="https://gitlab.com/gnutls/gnutls/merge_requests/879#note_139607805">lib/ext/record_size_limit.c</a>:
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<pre style="margin: 0;">+<span id="LC67" class="line" lang="c"> <span class="cm" style="color: #998; font-style: italic;">/* we do not want to accept sizes outside of our supported range */</span></span>
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<td class="diff-line-num new new_line" data-linenumber="68" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
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<pre style="margin: 0;">+<span id="LC68" class="line" lang="c"> <span class="k" style="font-weight: 600;">if</span> <span class="p">(</span><span class="n" style="color: #333;">new_size</span> <span class="o" style="font-weight: 600;"><</span> <span class="n" style="color: #333;">MIN_RECORD_SIZE</span><span class="p">)</span> <span class="p">{</span></span>
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<td class="diff-line-num new new_line" data-linenumber="69" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
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<pre style="margin: 0;">+<span id="LC69" class="line" lang="c"> <span class="cm" style="color: #998; font-style: italic;">/* for server, reject it by omitting the extension in the reply */</span></span>
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<pre style="margin: 0;">+<span id="LC70" class="line" lang="c"> <span class="k" style="font-weight: 600;">if</span> <span class="p">(</span><span class="n" style="color: #333;">session</span><span class="o" style="font-weight: 600;">-></span><span class="n" style="color: #333;">security_parameters</span><span class="p">.</span><span class="n" style="color: #333;">entity</span> <span class="o" style="font-weight: 600;">==</span> <span class="n" style="color: #333;">GNUTLS_SERVER</span><span class="p">)</span></span>
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<td class="diff-line-num new new_line" data-linenumber="71" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
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<pre style="margin: 0;">+<span id="LC71" class="line" lang="c"> <span class="k" style="font-weight: 600;">return</span> <span class="n" style="color: #333;">gnutls_assert_val</span><span class="p">(</span><span class="mi" style="color: #099;">0</span><span class="p">);</span></span>
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<pre style="margin: 0;">+<span id="LC72" class="line" lang="c"> <span class="k" style="font-weight: 600;">else</span></span>
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<td class="diff-line-num new new_line" data-linenumber="73" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
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<pre style="margin: 0;">+<span id="LC73" class="line" lang="c"> <span class="k" style="font-weight: 600;">return</span> <span class="n" style="color: #333;">gnutls_assert_val</span><span class="p">(</span><span class="n" style="color: #333;">GNUTLS_E_RECEIVED_ILLEGAL_PARAMETER</span><span class="p">);</span></span>
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<td class="diff-line-num new new_line" data-linenumber="74" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
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<pre style="margin: 0;">+<span id="LC74" class="line" lang="c"> <span class="p">}</span></span>
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72
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<pre style="margin: 0;"> <span id="LC75" class="line" lang="c"></span>
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73
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<pre style="margin: 0;"> <span id="LC76" class="line" lang="c"> <span class="n" style="color: #333;">session</span><span class="o" style="font-weight: 600;">-></span><span class="n" style="color: #333;">internals</span><span class="p">.</span><span class="n" style="color: #333;">hsk_flags</span> <span class="o" style="font-weight: 600;">|=</span> <span class="n" style="color: #333;">HSK_RECORD_SIZE_LIMIT_NEGOTIATED</span><span class="p">;</span></span>
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74
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<pre style="margin: 0;"> <span id="LC77" class="line" lang="c"></span>
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75
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<pre style="margin: 0;">-<span id="LC75" class="line" lang="c"> <span class="n" style="color: #333;">session</span><span class="o" style="font-weight: 600;">-></span><span class="n" style="color: #333;">security_parameters</span><span class="p">.</span><span class="n" style="color: #333;">max_record_recv_size</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">new_size</span><span class="p">;</span></span>
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<pre style="margin: 0;">+<span id="LC78" class="line" lang="c"> <span class="n" style="color: #333;">_gnutls_handshake_log</span><span class="p">(</span><span class="s" style="color: #d14;">"EXT[%p]: record_size_limit %u negotiated</span><span class="se" style="color: #d14;">\n</span><span class="s" style="color: #d14;">"</span><span class="p">,</span></span>
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<pre style="margin: 0;">+<span id="LC79" class="line" lang="c"> <span class="n" style="color: #333;">session</span><span class="p">,</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">unsigned</span><span class="p">)</span><span class="n" style="color: #333;">new_size</span><span class="p">);</span></span>
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<pre style="margin: 0;">+<span id="LC80" class="line" lang="c"></span>
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<pre style="margin: 0;">+<span id="LC81" class="line" lang="c"> <span class="n" style="color: #333;">session</span><span class="o" style="font-weight: 600;">-></span><span class="n" style="color: #333;">security_parameters</span><span class="p">.</span><span class="n" style="color: #333;">max_record_recv_size</span> <span class="o" style="font-weight: 600;">=</span></span>
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<p dir="auto">The size is checked against plaintext if I understand correctly.</p>
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