[PATCH] D80964: [X86] Add an Unoptimized Load Value Injection (LVI) Load Hardening Pass

[Scott Constable via Phabricator via llvm-commits]

sconstab created this revision.
sconstab added reviewers: nikic, craig.topper, mattdr.
Herald added subscribers: jfb, hiraditya.
Herald added a project: LLVM.
sconstab added a comment.

I should add that I am submitting this patch as an alternative to D80064 <https://reviews.llvm.org/D80064>. That revision invisibly disables the mitigation at `-O0`, which may not be secure for some users.


@nikic raised an issue on D75936 <https://reviews.llvm.org/D75936> that the added complexity to the O0 pipeline was causing noticeable slowdowns for `-O0` builds. This patch addresses the issue by adding a pass with equal security properties, but without any optimizations (and more importantly, without the need for expensive analysis dependencies).


https://reviews.llvm.org/D80964

Files:
  llvm/lib/Target/X86/X86.h
  llvm/lib/Target/X86/X86LoadValueInjectionLoadHardening.cpp
  llvm/lib/Target/X86/X86TargetMachine.cpp
  llvm/test/CodeGen/X86/O0-pipeline.ll
  llvm/test/CodeGen/X86/lvi-hardening-loads.ll

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