Exploit Methods/Userspace data usage

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(Mitigations)
(Mitigations)
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* emulate memory segmentation via separate page tables, PCID, etc (e.g. PaX_UDEREF)
 
* emulate memory segmentation via separate page tables, PCID, etc (e.g. PaX_UDEREF)
  
Right now, the upstream options available for PAN are:
+
Right now, the upstream options available for Privileged Access Never (PAN) are:
  
 
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Revision as of 18:45, 10 December 2015

Details

Sometimes an attacker won't be able to control the instruction pointer directly, but they will be able to redirect the dereference a structure or other pointer. In these cases, it is easiest to aim at malicious structures that have been built in userspace to perform the exploitation.

Examples

Mitigations

  • hardware segmentation: SMAP (x86), PAN (arm, arm64), Domains (arm)
  • emulate memory segmentation via separate page tables, PCID, etc (e.g. PaX_UDEREF)

Right now, the upstream options available for Privileged Access Never (PAN) are:

CPU Feature Name
ARM v7 32-bit non-LPAE CONFIG_CPU_SW_DOMAIN_PAN
v7 32-bit LPAE CONFIG_CPU_TTBR0_PAN (Catalin's series)
v8 32-bit CONFIG_CPU_TTBR0_PAN
v8 64-bit nothing
v8.1 hardware PAN
x86 pre-late-Broadwell nothing
Broadwell+ hardware PAN (SMAP)
powerpc nothing?
MIPS nothing?
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