linux-hardening - [PATCH 0/6] randstruct: Enable Clang support

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Date:   Tue,  3 May 2022 13:54:57 -0700
From:   Kees Cook <keescook@...omium.org>
To:     Bill Wendling <morbo@...gle.com>
Cc:     Kees Cook <keescook@...omium.org>,
        Masahiro Yamada <masahiroy@...nel.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        David Howells <dhowells@...hat.com>,
        Jeff Layton <jlayton@...nel.org>, linux-kernel@...r.kernel.org,
        linux-kbuild@...r.kernel.org, linux-hardening@...r.kernel.org,
        llvm@...ts.linux.dev
Subject: [PATCH 0/6] randstruct: Enable Clang support

Hi,

This enables Clang's recently added structure layout randomization
support, similar to the existing kernel-specific GCC plugin. The general
Makefile and Kconfig changes are mainly mechanical (moving options
around), but the random seed generation changes are a bit fiddly because
it needs to be created very early. I think I did this reasonably, but
I'd love some more eyes on it.

Thanks!

-Kees

Kees Cook (6):
  netfs: Eliminate Clang randstruct warning
  sancov: Split plugin build from plugin CFLAGS
  randstruct: Reorganize Kconfigs and attribute macros
  randstruct: Split randstruct Makefile and CFLAGS
  randstruct: Move seed generation into scripts/basic/
  randstruct: Enable Clang support

 Documentation/dontdiff                       |  1 +
 Documentation/kbuild/reproducible-builds.rst |  8 +--
 Makefile                                     |  1 +
 arch/arm/vdso/Makefile                       |  2 +-
 arch/arm64/kernel/vdso/Makefile              |  3 +-
 arch/riscv/Kconfig                           |  2 +-
 arch/sparc/vdso/Makefile                     |  3 +-
 arch/x86/entry/vdso/Makefile                 |  3 +-
 arch/x86/mm/pti.c                            |  2 +-
 include/linux/compiler-gcc.h                 |  8 ---
 include/linux/compiler_types.h               | 14 ++--
 include/linux/netfs.h                        |  4 +-
 include/linux/vermagic.h                     | 10 +--
 kernel/panic.c                               |  2 +-
 scripts/Makefile.gcc-plugins                 | 22 +++---
 scripts/Makefile.randstruct                  | 17 +++++
 scripts/basic/.gitignore                     |  1 +
 scripts/basic/Makefile                       | 11 +++
 scripts/gcc-plugins/Kconfig                  | 38 ----------
 scripts/gcc-plugins/Makefile                 | 15 ++--
 scripts/gcc-plugins/gen-random-seed.sh       |  9 ---
 scripts/gen-randstruct-seed.sh               |  7 ++
 security/Kconfig.hardening                   | 73 ++++++++++++++++++++
 23 files changed, 159 insertions(+), 97 deletions(-)
 create mode 100644 scripts/Makefile.randstruct
 delete mode 100755 scripts/gcc-plugins/gen-random-seed.sh
 create mode 100755 scripts/gen-randstruct-seed.sh

-- 
2.32.0