[PATCH] D137666: [msan] Increase size of app/shadow/origin mappings on aarch64

[Evgenii Stepanov via Phabricator via llvm-commits]

eugenis added a comment.

Ah, so is the problem with ASLR randomizing the initial executable mappings over a region larger than 64Gb? We do not care about app allocating memory, heap placement is defined by msan. Could you confirm that the new mapping covers all possible locations? Even with ex. a huge executable binary.

That's ok I guess, if we do not care about /39 and /42 on aarch64 linux. I'm also curious how much dynamic shadow mapping would cost (cpu and code size). It's not as straightforward as with ASan, because MSan can not allocate shadow in a single contiguous block, most likely. But it can save us a lot of pain down the road.


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  https://reviews.llvm.org/D137666/new/

https://reviews.llvm.org/D137666