[all-commits] [llvm/llvm-project] cd8248: Fixed a bug in `-fsanitize-kcfi-arity` (#142867)

[Scott Constable via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: cd8248f3e856a37cc1addcb74475b4d37dc8aa42
      https://github.com/llvm/llvm-project/commit/cd8248f3e856a37cc1addcb74475b4d37dc8aa42
  Author: Scott Constable <scott.d.constable at intel.com>
  Date:   2025-06-18 (Wed, 18 Jun 2025)

  Changed paths:
    M llvm/lib/Target/X86/X86AsmPrinter.cpp
    M llvm/test/CodeGen/X86/kcfi-arity.ll

  Log Message:
  -----------
  Fixed a bug in `-fsanitize-kcfi-arity` (#142867)

Compiling with `fsanitize-kcfi-arity` can crash the compiler if a
function has more than 6 arguments, including floating-point arguments
passed in XMM registers. This patch fixes the feature by only counter
integer and stack arguments toward kCFI arity. For example, the compiler
crashed when it attempted to generate kCFI arity information for this
function:
https://github.com/torvalds/linux/blob/16b70698aa3ae7888826d0c84567c72241cf6713/drivers/gpu/drm/amd/display/dc/dml/dcn32/display_mode_vba_util_32.h#L680

As noted in a comment, floating-point registers are not relevant to
enforcing kCFI at this time.



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