Difference between revisions of "Exploit Methods/Function pointer overwrite"
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(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...") |
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When an attacker has a write primitive, they can | When an attacker has a write primitive, they can overwrite 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. | ||
= Examples = | = Examples = | ||
Revision as of 16:11, 14 September 2016
Details
When an attacker has a write primitive, they can overwrite 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.
Examples
Mitigations
- make function pointer tables read-only (e.g. PAX_CONSTIFY_PLUGIN)
- make sensitive targets that need only occasional updates only writable during updates (e.g. PAX_KERNEXEC)