Re: [RFC/RFT 0/3] Add compiler support for Control Flow Integrity

[Hongtao Liu]

On Mon, Dec 19, 2022 at 3:59 PM Dan Li via Gcc-patches
<gcc-patches@xxxxxxxxxxx> wrote:
>
> This series of patches is mainly used to support the control flow
> integrity protection of the linux kernel [1], which is similar to
> -fsanitize=kcfi in clang 16.0 [2,3].
>
> I hope that this feature will also support user-mode CFI in the
> future (at least for developers who can recompile the runtime),
> so I use -fsanitize=cfi as a compilation option here.
>
> Any suggestion please let me know :).
Do you have this series as a branch somewhere that we could also try for x86?

>
> Thanks, Dan.
>
> [1] https://lore.kernel.org/all/20220908215504.3686827-1-samitolvanen@xxxxxxxxxx/
> [2] https://clang.llvm.org/docs/ControlFlowIntegrity.html
> [3] https://reviews.llvm.org/D119296
>
> Dan Li (3):
>   [PR102768] flag-types.h (enum sanitize_code): Extend sanitize_code to
>     64 bits to support more features
>   [PR102768] Support CFI: Add new pass for Control Flow Integrity
>   [PR102768] aarch64: Add support for Control Flow Integrity
>
> Signed-off-by: Dan Li <ashimida.1990@xxxxxxxxx>
>
> ---
>  gcc/Makefile.in                               |   1 +
>  gcc/asan.h                                    |   4 +-
>  gcc/c-family/c-attribs.cc                     |  10 +-
>  gcc/c-family/c-common.h                       |   2 +-
>  gcc/c/c-parser.cc                             |   4 +-
>  gcc/cgraphunit.cc                             |  34 +++
>  gcc/common.opt                                |   4 +-
>  gcc/config/aarch64/aarch64.cc                 | 106 ++++++++
>  gcc/cp/typeck.cc                              |   2 +-
>  gcc/doc/invoke.texi                           |  35 +++
>  gcc/doc/passes.texi                           |  10 +
>  gcc/doc/tm.texi                               |  27 +++
>  gcc/doc/tm.texi.in                            |   8 +
>  gcc/dwarf2asm.cc                              |   2 +-
>  gcc/flag-types.h                              |  67 ++---
>  gcc/opt-suggestions.cc                        |   2 +-
>  gcc/opts.cc                                   |  26 +-
>  gcc/opts.h                                    |   8 +-
>  gcc/output.h                                  |   3 +
>  gcc/passes.def                                |   1 +
>  gcc/target.def                                |  39 +++
>  .../aarch64/control_flow_integrity_1.c        |  14 ++
>  .../aarch64/control_flow_integrity_2.c        |  25 ++
>  .../aarch64/control_flow_integrity_3.c        |  23 ++
>  gcc/toplev.cc                                 |   4 +
>  gcc/tree-cfg.cc                               |   2 +-
>  gcc/tree-cfi.cc                               | 229 ++++++++++++++++++
>  gcc/tree-pass.h                               |   1 +
>  gcc/tree.cc                                   | 144 +++++++++++
>  gcc/tree.h                                    |   1 +
>  gcc/varasm.cc                                 |  29 +++
>  31 files changed, 803 insertions(+), 64 deletions(-)
>  create mode 100644 gcc/testsuite/gcc.target/aarch64/control_flow_integrity_1.c
>  create mode 100644 gcc/testsuite/gcc.target/aarch64/control_flow_integrity_2.c
>  create mode 100644 gcc/testsuite/gcc.target/aarch64/control_flow_integrity_3.c
>  create mode 100644 gcc/tree-cfi.cc
>
> --
> 2.17.1
>


--
BR,
Hongtao