forked from OSchip/llvm-project
8aa1490513
Currently, enablement of heap MTE on Android is specified by an ELF note, which signals to the linker to enable heap MTE. This change allows -fsanitize=memtag-heap to synthesize these notes, rather than adding them through the build system. We need to extend this feature to also signal the linker to do special work for MTE globals (in future) and MTE stack (currently implemented in the toolchain, but not implemented in the loader). Current Android uses a non-backwards-compatible ELF note, called ".note.android.memtag". Stack MTE is an ABI break anyway, so we don't mind that we won't be able to run executables with stack MTE on Android 11/12 devices. The current expectation is to support the verbiage used by Android, in that "SYNC" means MTE Synchronous mode, and "ASYNC" effectively means "fast", using the Kernel auto-upgrade feature that allows hardware-specific and core-specific configuration as to whether "ASYNC" would end up being Asynchronous, Asymmetric, or Synchronous on that particular core, whichever has a reasonable performance delta. Of course, this is platform and loader-specific. Differential Revision: https://reviews.llvm.org/D118948 |
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