[PATCH] D75936: Add a Pass to X86 that builds a Condensed CFG for Load Value Injection (LVI) Gadgets

[Scott Constable via Phabricator via llvm-commits]

sconstab created this revision.
sconstab added reviewers: craig.topper, andrew.w.kaylor, chandlerc, zbrid.
Herald added subscribers: jfb, hiraditya, mgorny.
Herald added a project: LLVM.

Adds a new data structure, ImmutableGraph, and uses RDF to find LVI gadgets and add them to a MachineGadgetGraph.

More specifically, a new X86 machine pass finds Load Value Injection (LVI) gadgets consisting of a load from memory (i.e., SOURCE), and any operation that may transmit the value loaded from memory over a covert channel, or use the value loaded from memory to determine a branch/call target (i.e., SINK).

Also adds a new target feature to X86: +lvi-load-hardening

The feature can be added via the clang CLI using `-mlvi-hardening`.


https://reviews.llvm.org/D75936

Files:
  clang/include/clang/Driver/Options.td
  clang/lib/Driver/ToolChains/Arch/X86.cpp
  llvm/lib/Target/X86/CMakeLists.txt
  llvm/lib/Target/X86/ImmutableGraph.h
  llvm/lib/Target/X86/X86.h
  llvm/lib/Target/X86/X86.td
  llvm/lib/Target/X86/X86LoadValueInjectionLoadHardening.cpp
  llvm/lib/Target/X86/X86Subtarget.h
  llvm/lib/Target/X86/X86TargetMachine.cpp
  llvm/test/CodeGen/X86/O0-pipeline.ll
  llvm/test/CodeGen/X86/O3-pipeline.ll
  llvm/test/CodeGen/X86/lvi-hardening-gadget-graph.ll

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