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<a href="https://gitlab.com/garycplin">Gary Lin</a> created an issue: <a href="https://gitlab.com/gnutls/libtasn1/-/issues/50">#50</a>
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<h2 dir="auto" style="font-size: 1.5em; font-weight: 600; padding-bottom: .3em; border-bottom-width: 1px; border-bottom-color: #bfbfc3; border-bottom-style: solid; color: #333238; margin: 0 0 16px;" align="initial">
<a id="user-content-description-of-problem" class="anchor" href="#description-of-problem" aria-hidden="true" style="margin-top: 0; float: left; margin-left: -20px; text-decoration: none; outline: none;"></a>Description of problem:</h2>
<p dir="auto" style="color: #333238; margin: 0 0 16px;" align="initial">From the grub2 <a href="https://lists.gnu.org/archive/html/grub-devel/2024-02/txtKIuUb5lf3O.txt" rel="nofollow noreferrer noopener" target="_blank" style="margin-top: 0;">coverity report</a>, it raised a potential buffer overrun in asn1_der_decoding2():</p>
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<pre class="code highlight js-syntax-highlight language-plaintext" lang="plaintext" v-pre="true" style='display: block; font-size: 14px; color: #333238; line-height: 1.6em; overflow-x: auto; border-radius: 4px; position: relative; font-family: var(--default-mono-font, "GitLab Mono"),"JetBrains Mono","Menlo","DejaVu Sans Mono","Liberation Mono","Consolas","Ubuntu Mono","Courier New","andale mono","lucida console",monospace; word-break: break-all; word-wrap: break-word; background-color: #fbfafd; margin: 0 0 16px; padding: 12px; border: 1px solid #dcdcde;'><code style='font-size: inherit; color: inherit; word-wrap: normal; word-break: keep-all; background-color: inherit; border-radius: 4px; white-space: pre; margin-top: 0; font-family: var(--default-mono-font, "GitLab Mono"),"JetBrains Mono","Menlo","DejaVu Sans Mono","Liberation Mono","Consolas","Ubuntu Mono","Courier New","andale mono","lucida console",monospace; overflow-wrap: normal; padding: unset;'><span id="LC1" class="line" lang="plaintext" style="margin-top: 0;">________________________________________________________________________________________________________</span>
<span id="LC2" class="line" lang="plaintext">*** CID 435766: Memory - corruptions (OVERRUN)</span>
<span id="LC3" class="line" lang="plaintext">/grub-core/lib/libtasn1/lib/decoding.c: 1204 in asn1_der_decoding2()</span>
<span id="LC4" class="line" lang="plaintext">1198 }</span>
<span id="LC5" class="line" lang="plaintext">1199 </span>
<span id="LC6" class="line" lang="plaintext">1200 DECR_LEN (ider_len, len2);</span>
<span id="LC7" class="line" lang="plaintext">1201 </span>
<span id="LC8" class="line" lang="plaintext">1202 tlen = strlen (temp);</span>
<span id="LC9" class="line" lang="plaintext">1203 if (tlen > 0)</span>
<span id="LC10" class="line" lang="plaintext">>>> CID 435766: Memory - corruptions (OVERRUN)</span>
<span id="LC11" class="line" lang="plaintext">>>> Allocating insufficient memory for the terminating null of the string.</span>
<span id="LC12" class="line" lang="plaintext">1204 _asn1_set_value (p, temp, tlen);</span>
<span id="LC13" class="line" lang="plaintext">1205 </span>
<span id="LC14" class="line" lang="plaintext">1206 counter += len2;</span>
<span id="LC15" class="line" lang="plaintext">1207 move = RIGHT;</span>
<span id="LC16" class="line" lang="plaintext">1208 break;</span>
<span id="LC17" class="line" lang="plaintext">1209 case ASN1_ETYPE_OCTET_STRING:</span></code></pre>
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<p dir="auto" style="color: #333238; margin: 0 0 16px;" align="initial">However, this seems to be false positive since DER format doesn't need the terminating null. I'd need the confirmation from libtasn1 upstream.</p>
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<a id="user-content-version-of-libtasn1-used" class="anchor" href="#version-of-libtasn1-used" aria-hidden="true" style="margin-top: 0; float: left; margin-left: -20px; text-decoration: none; outline: none;"></a>Version of libtasn1 used:</h2>
<p dir="auto" style="color: #333238; margin: 0 0 16px;" align="initial">4.19</p>
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<a id="user-content-distributor-of-libtasn1-eg-ubuntu-fedora-rhel" class="anchor" href="#distributor-of-libtasn1-eg-ubuntu-fedora-rhel" aria-hidden="true" style="margin-top: 0; float: left; margin-left: -20px; text-decoration: none; outline: none;"></a>Distributor of libtasn1 (e.g., Ubuntu, Fedora, RHEL)</h2>
<p dir="auto" style="color: #333238; margin: 0 0 16px;" align="initial">Upstream official tarball</p>
<h2 dir="auto" style="font-size: 1.5em; font-weight: 600; padding-bottom: .3em; border-bottom-width: 1px; border-bottom-color: #bfbfc3; border-bottom-style: solid; color: #333238; margin: 24px 0 16px;" align="initial">
<a id="user-content-how-reproducible" class="anchor" href="#how-reproducible" aria-hidden="true" style="margin-top: 0; float: left; margin-left: -20px; text-decoration: none; outline: none;"></a>How reproducible:</h2>
<p dir="auto" style="color: #333238; margin: 0 0 16px;" align="initial">Steps to Reproduce:</p>
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<li style="margin-top: 0; line-height: 1.6em; margin-left: 25px; padding-left: 3px;">one</li>
<li style="line-height: 1.6em; margin-left: 25px; padding-left: 3px;">two</li>
<li style="line-height: 1.6em; margin-left: 25px; padding-left: 3px;">three</li>
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<h2 dir="auto" style="font-size: 1.5em; font-weight: 600; padding-bottom: .3em; border-bottom-width: 1px; border-bottom-color: #bfbfc3; border-bottom-style: solid; color: #333238; margin: 24px 0 16px;" align="initial">
<a id="user-content-actual-results" class="anchor" href="#actual-results" aria-hidden="true" style="margin-top: 0; float: left; margin-left: -20px; text-decoration: none; outline: none;"></a>Actual results:</h2>
<h2 dir="auto" style="font-size: 1.5em; font-weight: 600; padding-bottom: .3em; border-bottom-width: 1px; border-bottom-color: #bfbfc3; border-bottom-style: solid; color: #333238; margin: 24px 0 0;" align="initial">
<a id="user-content-expected-results" class="anchor" href="#expected-results" aria-hidden="true" style="margin-top: 0; float: left; margin-left: -20px; text-decoration: none; outline: none;"></a>Expected results:</h2>
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