Exploit Methods/Function pointer overwrite

From Linux Kernel Security Subsystem
Revision as of 16:11, 14 September 2016 by KeesCook (Talk | contribs)

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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)
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