[PATCH] D87739: [WIP] scudo: Add an API for disabling memory initialization per-thread.

[Peter Collingbourne via Phabricator via llvm-commits]

pcc created this revision.
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Here "memory initialization" refers to zero- or pattern-init on
non-MTE hardware, or (where possible to avoid) memory tagging on MTE
hardware. With shared TSD the per-thread memory initialization state
is stored in bit 0 of the TLS slot, similar to PointerIntPair in LLVM.

TODO:

- Write tests.
- Find and fix a bug involving free/calloc with MTE, where sometimes the memory returned is not zeroed.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D87739

Files:
  compiler-rt/lib/scudo/standalone/chunk.h
  compiler-rt/lib/scudo/standalone/combined.h
  compiler-rt/lib/scudo/standalone/common.h
  compiler-rt/lib/scudo/standalone/include/scudo/interface.h
  compiler-rt/lib/scudo/standalone/tests/chunk_test.cpp
  compiler-rt/lib/scudo/standalone/tsd_exclusive.h
  compiler-rt/lib/scudo/standalone/tsd_shared.h
  compiler-rt/lib/scudo/standalone/wrappers_c.inc

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