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<a href="https://gitlab.com/nmav">Nikos Mavrogiannopoulos</a>
started a new discussion
on <a href="https://gitlab.com/gnutls/gnutls/merge_requests/733#note_95445700">lib/ext/record_size_limit.c</a>:
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<td class="diff-line-num new new_line" data-linenumber="47" 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="LC47" class="line" lang="c"><span class="p">};</span></span>
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<pre style="margin: 0;">+<span id="LC48" class="line" lang="c"></span>
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<pre style="margin: 0;">+<span id="LC49" class="line" lang="c"><span class="k" style="font-weight: 600;">static</span> <span class="kt" style="color: #458; font-weight: 600;">int</span></span>
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<pre style="margin: 0;">+<span id="LC50" class="line" lang="c"><span class="nf" style="color: #900; font-weight: 600;">_gnutls_record_size_limit_recv_params</span><span class="p">(</span><span class="n" style="color: #333;">gnutls_session_t</span> <span class="n" style="color: #333;">session</span><span class="p">,</span></span>
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<td class="diff-line-num new new_line" data-linenumber="51" 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="LC51" class="line" lang="c"> <span class="k" style="font-weight: 600;">const</span> <span class="kt" style="color: #458; font-weight: 600;">uint8_t</span> <span class="o" style="font-weight: 600;">*</span> <span class="n" style="color: #333;">data</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">size_t</span> <span class="n" style="color: #333;">_data_size</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC52" class="line" lang="c"><span class="p">{</span></span>
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<pre style="margin: 0;">+<span id="LC53" class="line" lang="c"> <span class="kt" style="color: #458; font-weight: 600;">ssize_t</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="LC54" class="line" lang="c"> <span class="kt" style="color: #458; font-weight: 600;">ssize_t</span> <span class="n" style="color: #333;">data_size</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">_data_size</span><span class="p">;</span></span>
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<pre style="margin: 0;">+<span id="LC55" class="line" lang="c"></span>
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<pre style="margin: 0;">+<span id="LC56" class="line" lang="c"> <span class="n" style="color: #333;">DECR_LEN</span><span class="p">(</span><span class="n" style="color: #333;">data_size</span><span class="p">,</span> <span class="mi" style="color: #099;">2</span><span class="p">);</span></span>
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<pre style="margin: 0;">+<span id="LC57" class="line" lang="c"> <span class="n" style="color: #333;">new_size</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">_gnutls_read_uint16</span><span class="p">(</span><span class="n" style="color: #333;">data</span><span class="p">);</span></span>
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<pre style="margin: 0;">+<span id="LC58" class="line" lang="c"></span>
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<pre style="margin: 0;">+<span id="LC59" class="line" lang="c"> <span class="cm" style="color: #998; font-style: italic;">/* treat receipt of a smaller value as a fatal error */</span></span>
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<pre style="margin: 0;">+<span id="LC60" 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="mi" style="color: #099;">64</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC61" 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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<pre style="margin: 0;">+<span id="LC62" class="line" lang="c"></span>
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<p dir="auto">64 feels way too small for normal applications, and looks more likely to be used as an attack vector especially if the server needs to transfer gigabytes of data. What if we ignore values less than 512 (the previous min value), and allow overriding with a gnutls_init flag (e.g., <code>ALLOW_TINY_RECORDS</code>)?</p>
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