[PATCH] D135411: Add generic KCFI operand bundle lowering

[Sami Tolvanen via Phabricator via cfe-commits]

samitolvanen created this revision.
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The KCFI sanitizer emits "kcfi" operand bundles to indirect
call instructions, which the LLVM back-end lowers into an
architecture-specific type check with a known machine instruction
sequence. Currently, KCFI operand bundle lowering is supported only
on 64-bit X86 and AArch64 architectures.

As a lightweight forward-edge CFI implementation that doesn't
require LTO is also useful for non-Linux low-level targets on
other machine architectures, add a generic KCFI operand bundle
lowering pass that's only used when back-end lowering support is not
available and allows -fsanitize=kcfi to be enabled in Clang on all
architectures.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D135411

Files:
  clang/lib/CodeGen/BackendUtil.cpp
  clang/lib/Driver/ToolChain.cpp
  llvm/include/llvm/InitializePasses.h
  llvm/include/llvm/Transforms/Instrumentation/KCFI.h
  llvm/lib/Passes/PassBuilder.cpp
  llvm/lib/Passes/PassRegistry.def
  llvm/lib/Transforms/Instrumentation/CMakeLists.txt
  llvm/lib/Transforms/Instrumentation/KCFI.cpp
  llvm/test/Transforms/KCFI/kcfi-patchable-function-prefix.ll
  llvm/test/Transforms/KCFI/kcfi-supported.ll
  llvm/test/Transforms/KCFI/kcfi.ll
  llvm/utils/gn/secondary/llvm/lib/Transforms/Instrumentation/BUILD.gn

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