[all-commits] [llvm/llvm-project] a78cfd: [GCOV] Set !kcfi_type metadata for indirectly call...

[Sami Tolvanen via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: a78cfd5909024f9daa9a5175e9d411b0fac0e9a1
      https://github.com/llvm/llvm-project/commit/a78cfd5909024f9daa9a5175e9d411b0fac0e9a1
  Author: Sami Tolvanen <samitolvanen at google.com>
  Date:   2023-01-11 (Wed, 11 Jan 2023)

  Changed paths:
    M llvm/include/llvm/Transforms/Utils/ModuleUtils.h
    M llvm/lib/Transforms/Instrumentation/GCOVProfiling.cpp
    M llvm/lib/Transforms/Utils/ModuleUtils.cpp
    A llvm/test/Transforms/GCOVProfiling/kcfi.ll

  Log Message:
  -----------
  [GCOV] Set !kcfi_type metadata for indirectly called functions

With CONFIG_GCOV_KERNEL, the Linux kernel indirectly calls the
__llvm_gcov_* functions generated by LLVM. With -fsanitize=kcfi,
these calls are made from instrumented code and fail indirect
call checks as they don't have !kcfi_type metadata. Similarly
to D138945, set type metadata for these functions to allow GCOV
and KCFI to be both enabled.

Link: https://github.com/ClangBuiltLinux/linux/issues/1778

Reviewed By: MaskRay

Differential Revision: https://reviews.llvm.org/D141444