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document progress on protected allocator state

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Daniel Micay 2018-10-14 22:12:03 -04:00
parent da6fd5b5ef
commit 3504465584
1 changed files with 7 additions and 3 deletions
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@ -155,10 +155,14 @@ allocation and then unmapped on free.
* Possible slab locations are skipped and remain memory protected, leaving slab
size class regions interspersed with guard pages
* Zero size allocations are memory protected
* Protected allocator metadata
* Address space for metadata is entirely reserved during initialization and
* Protected allocator state (including all metadata)
* Address space for state is entirely reserved during initialization and
never reused for allocations or anything else
* [implementing stronger protection is in-progress]
* State within global variables is entirely read-only after initialization
with pointers to the isolated allocator state so leaking the address of
the library doesn't leak the address of writable state
* [in-progress] Protection via Memory Protection Keys (MPK) on x86\_64
* [implementing stronger state protection is in-progress]
* Extension for retrieving the size of allocations with fallback
to a sentinel for pointers not managed by the allocator
* Can also return accurate values for pointers *within* small allocations