[PATCH 0/8] stackleak: Support Clang stack depth tracking

[Kees Cook]

Hi,

As part of looking at what GCC plugins could be replaced with Clang
implementations, this series uses the recently landed stack depth tracking
callback in Clang[1] to implement the stackleak feature. Since the Clang
feature is now landed, I'm moving this out of RFC to a v1.

Since this touches a lot of arch-specific Makefiles, I tried to trim
the CC list down to just mailing lists in those cases, otherwise the CC
was giant.

Thanks!

-Kees

[1] https://clang.llvm.org/docs/SanitizerCoverage.html#tracing-stack-depth

 v1:
  - Finalize Clang URLs for landed feature
  - Perform CFLAGS enabling more sanely, as done for randstruct
  - Split __no_sanitize_coverage into separate patch
  - Update hardening.config and MAINTAINERS
  - Fix bug found with nvme tree
 RFC: https://lore.kernel.org/lkml/20250502185834.work.560-kees@kernel.org/

Kees Cook (8):
  nvme-pci: Make nvme_pci_npages_prp() __always_inline
  init.h: Disable sanitizer coverage for __init and __head
  stackleak: Rename CONFIG_GCC_PLUGIN_STACKLEAK to CONFIG_STACKLEAK
  stackleak: Rename stackleak_track_stack to __sanitizer_cov_stack_depth
  stackleak: Split STACKLEAK_CFLAGS from GCC_PLUGINS_CFLAGS
  stackleak: Support Clang stack depth tracking
  configs/hardening: Enable CONFIG_STACKLEAK
  configs/hardening: Enable CONFIG_INIT_ON_FREE_DEFAULT_ON

 security/Kconfig.hardening                  | 25 ++++++----
 Makefile                                    |  1 +
 arch/arm/boot/compressed/Makefile           |  2 +-
 arch/arm/vdso/Makefile                      |  2 +-
 arch/arm64/kernel/pi/Makefile               |  2 +-
 arch/arm64/kernel/vdso/Makefile             |  3 +-
 arch/arm64/kvm/hyp/nvhe/Makefile            |  2 +-
 arch/riscv/kernel/pi/Makefile               |  2 +-
 arch/riscv/purgatory/Makefile               |  2 +-
 arch/sparc/vdso/Makefile                    |  3 +-
 arch/x86/entry/vdso/Makefile                |  3 +-
 arch/x86/purgatory/Makefile                 |  2 +-
 drivers/firmware/efi/libstub/Makefile       |  6 +--
 kernel/Makefile                             |  4 +-
 lib/Makefile                                |  2 +-
 scripts/Makefile.gcc-plugins                | 16 +------
 scripts/Makefile.stackleak                  | 21 +++++++++
 scripts/gcc-plugins/stackleak_plugin.c      | 52 ++++++++++-----------
 Documentation/admin-guide/sysctl/kernel.rst |  2 +-
 Documentation/security/self-protection.rst  |  2 +-
 arch/x86/entry/calling.h                    |  4 +-
 arch/x86/include/asm/init.h                 |  2 +-
 include/linux/init.h                        |  4 +-
 include/linux/sched.h                       |  4 +-
 include/linux/stackleak.h                   |  6 +--
 arch/arm/kernel/entry-common.S              |  2 +-
 arch/arm64/kernel/entry.S                   |  2 +-
 arch/riscv/kernel/entry.S                   |  2 +-
 arch/s390/kernel/entry.S                    |  2 +-
 drivers/misc/lkdtm/stackleak.c              |  8 ++--
 drivers/nvme/host/pci.c                     |  2 +-
 kernel/stackleak.c                          |  4 +-
 tools/objtool/check.c                       |  2 +-
 tools/testing/selftests/lkdtm/config        |  2 +-
 MAINTAINERS                                 |  6 ++-
 kernel/configs/hardening.config             |  6 +++
 36 files changed, 122 insertions(+), 90 deletions(-)
 create mode 100644 scripts/Makefile.stackleak

-- 
2.34.1