http://kernsec.org/wiki/index.php?title=Exploit_Methods/Function_pointer_overwrite&feed=atom&action=history
Exploit Methods/Function pointer overwrite - Revision history
2024-03-29T00:29:06Z
Revision history for this page on the wiki
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http://kernsec.org/wiki/index.php?title=Exploit_Methods/Function_pointer_overwrite&diff=3803&oldid=prev
KeesCook: /* Mitigations */
2016-09-14T16:17:24Z
<p><span dir="auto"><span class="autocomment">Mitigations</span></span></p>
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<td colspan="2" style="background-color: #fff; color: #202122; text-align: center;">Revision as of 16:17, 14 September 2016</td>
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<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>= Mitigations =</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>= Mitigations =</div></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br/></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br/></td></tr>
<tr><td colspan="2"></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;">* mark function pointer tables "const" when they can be statically assigned, making them read-only for the entire kernel runtime.</ins></div></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>* use __ro_after_init on function pointer tables that are only written during __init so they are read-only during the rest of the kernel runtime.</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>* use __ro_after_init on function pointer tables that are only written during __init so they are read-only during the rest of the kernel runtime.</div></td></tr>
<tr><td class="diff-marker" data-marker="−"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div>* make all function pointer tables read-only at compile time (e.g. PAX_CONSTIFY_PLUGIN)</div></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div>* make all function pointer tables read-only at compile time (e.g. PAX_CONSTIFY_PLUGIN)<ins style="font-weight: bold; text-decoration: none;">.</ins></div></td></tr>
<tr><td class="diff-marker" data-marker="−"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div>* make sensitive targets that need only occasional updates only writable during rare updates (e.g. PAX_KERNEXEC)</div></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div>* make sensitive targets that need only occasional updates only writable during rare updates (e.g. PAX_KERNEXEC)<ins style="font-weight: bold; text-decoration: none;">.</ins></div></td></tr>
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KeesCook
http://kernsec.org/wiki/index.php?title=Exploit_Methods/Function_pointer_overwrite&diff=3802&oldid=prev
KeesCook: /* Mitigations */
2016-09-14T16:13:26Z
<p><span dir="auto"><span class="autocomment">Mitigations</span></span></p>
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<td colspan="2" style="background-color: #fff; color: #202122; text-align: center;">Revision as of 16:13, 14 September 2016</td>
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<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>= Mitigations =</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>= Mitigations =</div></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br/></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br/></td></tr>
<tr><td class="diff-marker" data-marker="−"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div>* make function pointer tables read-only (e.g. PAX_CONSTIFY_PLUGIN)</div></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;">* use __ro_after_init on function pointer tables that are only written during __init so they are read-only during the rest of the kernel runtime.</ins></div></td></tr>
<tr><td class="diff-marker" data-marker="−"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div>* make sensitive targets that need only occasional updates only writable during updates (e.g. PAX_KERNEXEC)</div></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div>* make <ins style="font-weight: bold; text-decoration: none;">all </ins>function pointer tables read-only <ins style="font-weight: bold; text-decoration: none;">at compile time </ins>(e.g. PAX_CONSTIFY_PLUGIN)</div></td></tr>
<tr><td colspan="2"></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div>* make sensitive targets that need only occasional updates only writable during <ins style="font-weight: bold; text-decoration: none;">rare </ins>updates (e.g. PAX_KERNEXEC)</div></td></tr>
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KeesCook
http://kernsec.org/wiki/index.php?title=Exploit_Methods/Function_pointer_overwrite&diff=3801&oldid=prev
KeesCook: /* Details */
2016-09-14T16:11:30Z
<p><span dir="auto"><span class="autocomment">Details</span></span></p>
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<td colspan="2" style="background-color: #fff; color: #202122; text-align: center;">Revision as of 16:11, 14 September 2016</td>
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<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>= Details =</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>= Details =</div></td></tr>
<tr><td class="diff-marker" data-marker="−"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div>When an attacker has a write primitive, they can <del style="font-weight: bold; text-decoration: none;">start </del>function pointers to redirect execution. Function pointers exist in a large number of places in the kernel ranging from function pointer tables (e.g. fops), to vector and descriptor tables.</div></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div>When an attacker has a write primitive, they can <ins style="font-weight: bold; text-decoration: none;">overwrite </ins>function pointers to redirect execution. Function pointers exist in a large number of places in the kernel ranging from function pointer tables (e.g. fops), to vector and descriptor tables.</div></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br/></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br/></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>= Examples =</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>= Examples =</div></td></tr>
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KeesCook
http://kernsec.org/wiki/index.php?title=Exploit_Methods/Function_pointer_overwrite&diff=3739&oldid=prev
KeesCook: Created page with "= Details = When an attacker has a write primitive, they can start function pointers to redirect execution. Function pointers exist in a large number of places in the kernel r..."
2015-11-04T23:10:31Z
<p>Created page with "= Details = When an attacker has a write primitive, they can start function pointers to redirect execution. Function pointers exist in a large number of places in the kernel r..."</p>
<p><b>New page</b></p><div>= Details =<br />
When an attacker has a write primitive, they can start function pointers to redirect execution. Function pointers exist in a large number of places in the kernel ranging from function pointer tables (e.g. fops), to vector and descriptor tables.<br />
<br />
= Examples =<br />
<br />
* [https://outflux.net/blog/archives/2010/10/19/cve-2010-2963-v4l-compat-exploit/ security_operations overwrite]<br />
* [https://blogs.oracle.com/ksplice/entry/anatomy_of_an_exploit_cve IDT, timer_list_fops, or security_operations overwrite]<br />
<br />
= Mitigations =<br />
<br />
* make function pointer tables read-only (e.g. PAX_CONSTIFY_PLUGIN)<br />
* make sensitive targets that need only occasional updates only writable during updates (e.g. PAX_KERNEXEC)</div>
KeesCook