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<a href="https://gitlab.com/dueno">Daiki Ueno</a>
commented on a
<a href="https://gitlab.com/gnutls/gnutls/-/merge_requests/1675#note_1202533881">discussion</a>:
</p>
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<p dir="auto" style="color: #333238; margin: 0 0 16px;" align="initial">IIUC, before the change:</p>
<ol dir="auto" style="text-align: initial; margin: 0 0 16px; padding: 0;">
<li style="margin-top: 0; line-height: 1.6em; margin-left: 25px; padding-left: 3px;">the libraries with known SONAMEs are <code style='font-size: 90%; color: #1f1e24; word-wrap: break-word; background-color: #ececef; border-radius: 4px; margin-top: 0; font-family: var(--default-mono-font, "Menlo"),"DejaVu Sans Mono","Liberation Mono","Consolas","Ubuntu Mono","Courier New","andale mono","lucida console",monospace; white-space: pre-wrap; overflow-wrap: break-word; word-break: keep-all; padding: 2px 4px;'>dlopen</code>'ed</li>
<li style="line-height: 1.6em; margin-left: 25px; padding-left: 3px;">the existence of some specific symbols in the library is checked with <code style='font-size: 90%; color: #1f1e24; word-wrap: break-word; background-color: #ececef; border-radius: 4px; margin-top: 0; font-family: var(--default-mono-font, "Menlo"),"DejaVu Sans Mono","Liberation Mono","Consolas","Ubuntu Mono","Courier New","andale mono","lucida console",monospace; white-space: pre-wrap; overflow-wrap: break-word; word-break: keep-all; padding: 2px 4px;'>dlsym</code>
</li>
<li style="line-height: 1.6em; margin-left: 25px; padding-left: 3px;">HMACs are checked for the files pointed by <code style='font-size: 90%; color: #1f1e24; word-wrap: break-word; background-color: #ececef; border-radius: 4px; margin-top: 0; font-family: var(--default-mono-font, "Menlo"),"DejaVu Sans Mono","Liberation Mono","Consolas","Ubuntu Mono","Courier New","andale mono","lucida console",monospace; white-space: pre-wrap; overflow-wrap: break-word; word-break: keep-all; padding: 2px 4px;'>dli_fname</code> after <code style='font-size: 90%; color: #1f1e24; word-wrap: break-word; background-color: #ececef; border-radius: 4px; font-family: var(--default-mono-font, "Menlo"),"DejaVu Sans Mono","Liberation Mono","Consolas","Ubuntu Mono","Courier New","andale mono","lucida console",monospace; white-space: pre-wrap; overflow-wrap: break-word; word-break: keep-all; padding: 2px 4px;'>dladdr</code>
</li>
</ol>
<p dir="auto" style="color: #333238; margin: 0 0 16px;" align="initial">After the change:</p>
<ol dir="auto" style="text-align: initial; margin: 0 0 16px; padding: 0;">
<li style="margin-top: 0; line-height: 1.6em; margin-left: 25px; padding-left: 3px;">the loaded libraries are enumerated with <code style='font-size: 90%; color: #1f1e24; word-wrap: break-word; background-color: #ececef; border-radius: 4px; margin-top: 0; font-family: var(--default-mono-font, "Menlo"),"DejaVu Sans Mono","Liberation Mono","Consolas","Ubuntu Mono","Courier New","andale mono","lucida console",monospace; white-space: pre-wrap; overflow-wrap: break-word; word-break: keep-all; padding: 2px 4px;'>dl_iterate_phdr</code>
</li>
<li style="line-height: 1.6em; margin-left: 25px; padding-left: 3px;">for each library, check the last component of <code style='font-size: 90%; color: #1f1e24; word-wrap: break-word; background-color: #ececef; border-radius: 4px; margin-top: 0; font-family: var(--default-mono-font, "Menlo"),"DejaVu Sans Mono","Liberation Mono","Consolas","Ubuntu Mono","Courier New","andale mono","lucida console",monospace; white-space: pre-wrap; overflow-wrap: break-word; word-break: keep-all; padding: 2px 4px;'>dlpi_name</code> matches known any of known SONAMEs</li>
<li style="line-height: 1.6em; margin-left: 25px; padding-left: 3px;">if matches, HMAC is checked for the file pointed by <code style='font-size: 90%; color: #1f1e24; word-wrap: break-word; background-color: #ececef; border-radius: 4px; margin-top: 0; font-family: var(--default-mono-font, "Menlo"),"DejaVu Sans Mono","Liberation Mono","Consolas","Ubuntu Mono","Courier New","andale mono","lucida console",monospace; white-space: pre-wrap; overflow-wrap: break-word; word-break: keep-all; padding: 2px 4px;'>dlpi_name</code>
</li>
</ol>
<p dir="auto" style="color: #333238; margin: 0 0 16px;" align="initial">Afaik the first steps are equivalent (i.e., <code style='font-size: 90%; color: #1f1e24; word-wrap: break-word; background-color: #ececef; border-radius: 4px; margin-top: 0; font-weight: inherit; font-family: var(--default-mono-font, "Menlo"),"DejaVu Sans Mono","Liberation Mono","Consolas","Ubuntu Mono","Courier New","andale mono","lucida console",monospace; white-space: pre-wrap; overflow-wrap: break-word; word-break: keep-all; padding: 2px 4px;'>dlopen</code> doesn't try to load libs if they are already loaded). The questions are:</p>
<ul dir="auto" style="text-align: initial; list-style-type: disc; margin: 0; padding: 0;">
<li style="margin-top: 0; line-height: 1.6em; margin-left: 25px; padding-left: 3px;">Can we safely omit checking of the existence of function symbols?</li>
<li style="line-height: 1.6em; margin-left: 25px; padding-left: 3px;">Can we assume <code style='font-size: 90%; color: #1f1e24; word-wrap: break-word; background-color: #ececef; border-radius: 4px; margin-top: 0; font-family: var(--default-mono-font, "Menlo"),"DejaVu Sans Mono","Liberation Mono","Consolas","Ubuntu Mono","Courier New","andale mono","lucida console",monospace; white-space: pre-wrap; overflow-wrap: break-word; word-break: keep-all; padding: 2px 4px;'>dlpi_name</code> is always constructed so it points to the actual file path, ending with the SONAME?</li>
</ul>
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