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<a href="https://gitlab.com/smuellerDD">Stephan Mueller</a>
commented on a
discussion on <a href="https://gitlab.com/gnutls/gnutls/-/merge_requests/1404#note_531113363">lib/accelerated/afalg.c</a>:
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<pre style="margin: 0;">+<span id="LC308" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * read-only</span></span>
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<pre style="margin: 0;">+<span id="LC309" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> */</span></span>
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<pre style="margin: 0;">+<span id="LC310" class="line" lang="c"> <span class="n" style="color: #333;">iov</span><span class="p">[</span><span class="mi" style="color: #099;">1</span><span class="p">].</span><span class="n" style="color: #333;">iov_base</span> <span class="o" style="font-weight: 600;">=</span> <span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">void</span> <span class="o" style="font-weight: 600;">*</span><span class="p">)</span><span class="n" style="color: #333;">encr</span><span class="p">;</span></span>
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<pre style="margin: 0;">+<span id="LC311" class="line" lang="c"> <span class="n" style="color: #333;">iov</span><span class="p">[</span><span class="mi" style="color: #099;">1</span><span class="p">].</span><span class="n" style="color: #333;">iov_len</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">encr_size</span><span class="p">;</span></span>
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<pre style="margin: 0;">+<span id="LC312" class="line" lang="c"></span>
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<pre style="margin: 0;">+<span id="LC313" class="line" lang="c"> <span class="k" style="font-weight: 600;">if</span> <span class="p">(</span><span class="n" style="color: #333;">kcapi_aead_stream_update_last</span><span class="p">(</span><span class="n" style="color: #333;">ctx</span><span class="o" style="font-weight: 600;">-></span><span class="n" style="color: #333;">handle</span><span class="p">,</span> <span class="n" style="color: #333;">iov</span><span class="p">,</span> <span class="mi" style="color: #099;">2</span><span class="p">)</span> <span class="o" style="font-weight: 600;"><</span> <span class="mi" style="color: #099;">0</span><span class="p">)</span> <span class="p">{</span></span>
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<pre style="margin: 0;">+<span id="LC314" class="line" lang="c"> <span class="n" style="color: #333;">gnutls_assert</span><span class="p">();</span></span>
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<pre style="margin: 0;">+<span id="LC315" class="line" lang="c"> <span class="k" style="font-weight: 600;">return</span> <span class="n" style="color: #333;">GNUTLS_E_ENCRYPTION_FAILED</span><span class="p">;</span></span>
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<pre style="margin: 0;">+<span id="LC316" class="line" lang="c"> <span class="p">}</span></span>
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<pre style="margin: 0;">+<span id="LC317" class="line" lang="c"></span>
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<pre style="margin: 0;">+<span id="LC318" class="line" lang="c"> <span class="cm" style="color: #998; font-style: italic;">/* The kernel may set the AAD, avoid modification of auth */</span></span>
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<pre style="margin: 0;">+<span id="LC319" class="line" lang="c"> <span class="n" style="color: #333;">iov</span><span class="p">[</span><span class="mi" style="color: #099;">0</span><span class="p">].</span><span class="n" style="color: #333;">iov_base</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">authtmp</span><span class="p">;</span></span>
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<pre style="margin: 0;">+<span id="LC320" class="line" lang="c"></span>
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<pre style="margin: 0;">+<span id="LC321" class="line" lang="c"> <span class="cm" style="color: #998; font-style: italic;">/* Set PT buffer to be filled by kernel */</span></span>
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<pre style="margin: 0;">+<span id="LC322" class="line" lang="c"> <span class="n" style="color: #333;">iov</span><span class="p">[</span><span class="mi" style="color: #099;">1</span><span class="p">].</span><span class="n" style="color: #333;">iov_base</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">plain</span><span class="p">;</span></span>
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<pre style="margin: 0;">+<span id="LC323" class="line" lang="c"> <span class="n" style="color: #333;">iov</span><span class="p">[</span><span class="mi" style="color: #099;">1</span><span class="p">].</span><span class="n" style="color: #333;">iov_len</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">plain_size</span><span class="p">;</span></span>
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<p dir="auto">May I ask for the motivation to use <code>kcapi_aead_outbuflen_dec</code>? I fear that you can easily introduce a buffer overflow this way as <code>kcapi_aead_outbuflen_dec</code> returns the size needed in user space to fulfill the request. Are you sure that plain is of sufficient size?</p>
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