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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_531270177">lib/accelerated/afalg.c</a>:
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<pre style="margin: 0;">+<span id="LC393" 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="LC394" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * Set AAD: IOVECs do not support const, this buffer is guaranteed to be</span></span>
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<pre style="margin: 0;">+<span id="LC395" 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="LC396" 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="LC397" 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="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;">auth</span><span class="p">;</span></span>
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<pre style="margin: 0;">+<span id="LC398" 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_len</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">auth_size</span><span class="p">;</span></span>
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<pre style="margin: 0;">+<span id="LC399" class="line" lang="c"></span>
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<pre style="margin: 0;">+<span id="LC400" 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="LC401" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * Set PT: IOVECs do not support const, this buffer is guaranteed to be</span></span>
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<pre style="margin: 0;">+<span id="LC402" 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="LC403" 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="LC404" 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;">plain</span><span class="p">;</span></span>
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<pre style="margin: 0;">+<span id="LC405" 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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<pre style="margin: 0;">+<span id="LC406" class="line" lang="c"></span>
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<pre style="margin: 0;">+<span id="LC407" 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="LC408" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * Older kernels require tag as input. This buffer data is unused</span></span>
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<p dir="auto">I recommend leaving it. This "older kernel" references:</p>
<pre class="code highlight js-syntax-highlight plaintext" lang="plaintext" v-pre="true" style="background-color: #fff; font-family: monospace; font-size: 90%; -premailer-cellpadding: 0; -premailer-cellspacing: 0; -premailer-width: 100%; margin: 0;"><code><span id="LC1" class="line" lang="plaintext"> uint32_t len = inlen + assoclen;</span>
<span id="LC2" class="line" lang="plaintext"></span>
<span id="LC3" class="line" lang="plaintext"> if (!handle->flags.ge_v4_9 == true)</span>
<span id="LC4" class="line" lang="plaintext"> len += taglen;</span>
<span id="LC5" class="line" lang="plaintext"></span>
<span id="LC6" class="line" lang="plaintext"> return len;</span></code></pre>
<p dir="auto">I think it is not wise to require a minimum kernel version for GnuTLS/AF_ALG. IMHO this check is cheap, we should leave this.</p>
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