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<a href="https://gitlab.com/grey3228">Mikhail</a>
commented on a
<a href="https://gitlab.com/gnutls/gnutls/-/issues/1777#note_2971424819">discussion</a>:
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<p dir="auto" style="color: #3a383f; margin: 0 0 1rem;" align="initial">Thanks for the piece of advice, I rebuilded it with <code style='font-size: 90%; color: #18171d; word-wrap: break-word; background-color: #ececef; border-radius: .25rem; margin-top: 0; font-weight: inherit; overflow-wrap: break-word; white-space: break-spaces; font-family: "GitLab Mono", "JetBrains Mono", "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; font-variant-ligatures: none; word-break: keep-all; padding: 0.125rem 0.25rem;'>CFLAGS="-O2 -D_FORTIFY_SOURCE=2"</code>and got:</p>
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<pre class="code highlight js-syntax-highlight language-plaintext" v-pre="true" style='display: block; font-size: 14px; color: #3a383f; line-height: 1.6em; overflow-x: auto; border-radius: .25rem; position: relative; font-family: "GitLab Mono", "JetBrains Mono", "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; font-variant-ligatures: none; word-break: break-all; word-wrap: break-word; background-color: #fbfafd; margin: 0 0 1rem; 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: .25rem; white-space: pre; margin-top: 0; font-family: "GitLab Mono", "JetBrains Mono", "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; font-variant-ligatures: none; overflow-wrap: normal; padding: unset;'><span id="LC1" class="line" lang="plaintext" style="margin-top: 0;">~$ srptool --passwd-conf ~/tpasswd.conf --passwd ~/tpasswd --username testuser --index=7</span>
<span id="LC2" class="line" lang="plaintext">Enter password: </span>
<span id="LC3" class="line" lang="plaintext">*** buffer overflow detected ***: terminated</span>
<span id="LC4" class="line" lang="plaintext">Aborted (core dumped)</span></code></pre>
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<p dir="auto" style="color: #3a383f; margin: 0 0 1rem;" align="initial">So overflow is confirmed.</p>
<p dir="auto" style="color: #3a383f; margin: 0 0 1rem;" align="initial">Also, then I tried to increase buffer size up to 2048 and rebuild it, after that overflow doesn't happen obviously, same as "Encoding error" doesn't reproduce anymore -- I don't know why it didn't work earlier for me.. Maybe I missed something.</p>
<p dir="auto" style="color: #3a383f; margin: 0 0 1rem;" align="initial">Would it make sense to increse buffer size as I proposed it? Something like that, f.e.:</p>
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<pre class="code highlight js-syntax-highlight language-plaintext" v-pre="true" style='display: block; font-size: 14px; color: #3a383f; line-height: 1.6em; overflow-x: auto; border-radius: .25rem; position: relative; font-family: "GitLab Mono", "JetBrains Mono", "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; font-variant-ligatures: none; word-break: break-all; word-wrap: break-word; background-color: #fbfafd; margin: 0 0 1rem; 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: .25rem; white-space: pre; margin-top: 0; font-family: "GitLab Mono", "JetBrains Mono", "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; font-variant-ligatures: none; overflow-wrap: normal; padding: unset;'><span id="LC1" class="line" lang="plaintext" style="margin-top: 0;">static char *_srp_crypt(const char *username, const char *passwd, int salt_size,</span>
<span id="LC2" class="line" lang="plaintext"> const gnutls_datum_t *g, const gnutls_datum_t *n)</span>
<span id="LC3" class="line" lang="plaintext">{</span>
<span id="LC4" class="line" lang="plaintext"> unsigned char salt[128];</span>
<span id="LC5" class="line" lang="plaintext"> static char result[2048];</span>
<span id="LC6" class="line" lang="plaintext"> ...</span>
<span id="LC7" class="line" lang="plaintext"> if (snprintf(result, sizeof(result), "%s:%s", </span>
<span id="LC8" class="line" lang="plaintext"> txt_verifier.data, txt_salt.data) >= sizeof(result)) {</span>
<span id="LC9" class="line" lang="plaintext"> fprintf(stderr, "Unexpectedly large SRP verifier - buffer too small\n");</span>
<span id="LC10" class="line" lang="plaintext"> return NULL;</span>
<span id="LC11" class="line" lang="plaintext"> }</span>
<span id="LC12" class="line" lang="plaintext"> ...</span></code></pre>
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