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add basic overview of part of the approach to MTE

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Daniel Micay 2018-11-03 03:09:03 -04:00
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@ -235,6 +235,16 @@ was a bit less important and if a core goal was finding latent bugs.
* Errors other than ENOMEM from mmap, munmap, mprotect and mremap treated
as fatal, which can help to detect memory management gone wrong elsewhere
in the process.
* [future] Memory tagging for slab allocations via MTE on ARMv8.5+
* random memory tags as the baseline, providing probabilistic protection
against various forms of memory corruption
* dedicated tag for free slots, set on free, for deterministic protection
against accessing freed memory
* store previous random tag within freed slab allocations, and increment it
to get the next tag for that slot to provide deterministic use-after-free
detection through multiple cycles of memory reuse
* guarantee distinct tags for adjacent memory allocations by incrementing
past matching values for deterministic detection of linear overflows
# Randomness