[PATCH] D64169: ARM MTE stack sanitizer.

[Evgenii Stepanov via Phabricator via cfe-commits]

eugenis created this revision.
eugenis added reviewers: pcc, hctim, vitalybuka, ostannard.
Herald added subscribers: dexonsmith, steven_wu, cryptoad, hiraditya, kristof.beyls, javed.absar, mehdi_amini, srhines.
Herald added projects: clang, LLVM.

Add "memtag" sanitizer that detects and mitigates stack memory issues
using armv8.5 Memory Tagging Extension.

It is similar in principle to HWASan, which is a software implementation
of the same idea, but there are enough differencies to warrant a new
sanitizer type IMHO. It is also expected to have very different
performance properties.

The new sanitizer does not have a runtime library (it may grow one
later, along with a "debugging" mode). Similar to SafeStack and
StackProtector, the instrumentation pass (in a follow up change) will be
inserted in all cases, but will only affect functions marked with the
new sanitize_memtag attribute.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D64169

Files:
  clang/include/clang/Basic/Features.def
  clang/include/clang/Basic/Sanitizers.def
  clang/lib/CodeGen/CGDeclCXX.cpp
  clang/lib/CodeGen/CodeGenFunction.cpp
  clang/lib/CodeGen/CodeGenModule.cpp
  clang/lib/CodeGen/SanitizerMetadata.cpp
  clang/lib/Driver/SanitizerArgs.cpp
  clang/lib/Driver/ToolChains/Linux.cpp
  clang/test/CodeGen/memtag-attr.cpp
  clang/test/Driver/fsanitize.c
  clang/test/Lexer/has_feature_memtag_sanitizer.cpp
  clang/test/SemaCXX/attr-no-sanitize.cpp
  llvm/docs/BitCodeFormat.rst
  llvm/docs/LangRef.rst
  llvm/include/llvm/Bitcode/LLVMBitCodes.h
  llvm/include/llvm/IR/Attributes.td
  llvm/lib/AsmParser/LLLexer.cpp
  llvm/lib/AsmParser/LLParser.cpp
  llvm/lib/AsmParser/LLToken.h
  llvm/lib/Bitcode/Reader/BitcodeReader.cpp
  llvm/lib/Bitcode/Writer/BitcodeWriter.cpp
  llvm/lib/IR/Attributes.cpp
  llvm/lib/IR/Verifier.cpp
  llvm/lib/Transforms/IPO/ForceFunctionAttrs.cpp
  llvm/lib/Transforms/Utils/CodeExtractor.cpp
  llvm/test/Bitcode/attributes.ll
  llvm/test/Transforms/Inline/attributes.ll
  llvm/utils/emacs/llvm-mode.el

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