[PATCH v2 00/14] stackleak: Support Clang stack depth tracking

[Kees Cook]

 v2:
  - rename stackleak to kstack_erase (mingo)
  - address __init vs inline with KCOV changes
 v1:  https://lore.kernel.org/lkml/20250507180852.work.231-kees@kernel.org/
 RFC: https://lore.kernel.org/lkml/20250502185834.work.560-kees@kernel.org/

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

Kees Cook (14):
  stackleak: Rename STACKLEAK to KSTACK_ERASE
  stackleak: Rename stackleak_track_stack to __sanitizer_cov_stack_depth
  stackleak: Split KSTACK_ERASE_CFLAGS from GCC_PLUGINS_CFLAGS
  x86: Handle KCOV __init vs inline mismatches
  arm: Handle KCOV __init vs inline mismatches
  arm64: Handle KCOV __init vs inline mismatches
  s390: Handle KCOV __init vs inline mismatches
  powerpc: Handle KCOV __init vs inline mismatches
  mips: Handle KCOV __init vs inline mismatches
  loongarch: Handle KCOV __init vs inline mismatches
  init.h: Disable sanitizer coverage for __init and __head
  kstack_erase: Support Clang stack depth tracking
  configs/hardening: Enable CONFIG_KSTACK_ERASE
  configs/hardening: Enable CONFIG_INIT_ON_FREE_DEFAULT_ON

 arch/Kconfig                                  |  4 +-
 arch/arm/Kconfig                              |  2 +-
 arch/arm64/Kconfig                            |  2 +-
 arch/riscv/Kconfig                            |  2 +-
 arch/s390/Kconfig                             |  2 +-
 arch/x86/Kconfig                              |  2 +-
 security/Kconfig.hardening                    | 45 +++++++++-------
 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         |  8 +--
 drivers/misc/lkdtm/Makefile                   |  2 +-
 kernel/Makefile                               | 10 ++--
 lib/Makefile                                  |  2 +-
 scripts/Makefile.gcc-plugins                  | 16 +-----
 scripts/Makefile.kstack_erase                 | 21 ++++++++
 scripts/gcc-plugins/stackleak_plugin.c        | 52 +++++++++----------
 Documentation/admin-guide/sysctl/kernel.rst   |  4 +-
 Documentation/arch/x86/x86_64/mm.rst          |  2 +-
 Documentation/security/self-protection.rst    |  2 +-
 .../zh_CN/security/self-protection.rst        |  2 +-
 arch/arm64/include/asm/acpi.h                 |  2 +-
 arch/loongarch/include/asm/smp.h              |  2 +-
 arch/mips/include/asm/time.h                  |  2 +-
 arch/s390/hypfs/hypfs.h                       |  2 +-
 arch/s390/hypfs/hypfs_diag.h                  |  2 +-
 arch/x86/entry/calling.h                      |  4 +-
 arch/x86/include/asm/acpi.h                   |  4 +-
 arch/x86/include/asm/init.h                   |  2 +-
 arch/x86/include/asm/realmode.h               |  2 +-
 include/linux/acpi.h                          |  4 +-
 include/linux/bootconfig.h                    |  2 +-
 include/linux/efi.h                           |  2 +-
 include/linux/init.h                          |  4 +-
 include/linux/{stackleak.h => kstack_erase.h} | 20 +++----
 include/linux/memblock.h                      |  2 +-
 include/linux/mfd/dbx500-prcmu.h              |  2 +-
 include/linux/sched.h                         |  4 +-
 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 +-
 arch/arm/mm/cache-feroceon-l2.c               |  2 +-
 arch/arm/mm/cache-tauros2.c                   |  2 +-
 arch/loongarch/kernel/time.c                  |  2 +-
 arch/loongarch/mm/ioremap.c                   |  4 +-
 arch/powerpc/mm/book3s64/hash_utils.c         |  2 +-
 arch/powerpc/mm/book3s64/radix_pgtable.c      |  2 +-
 arch/s390/mm/init.c                           |  2 +-
 arch/x86/kernel/kvm.c                         |  2 +-
 drivers/clocksource/timer-orion.c             |  2 +-
 .../lkdtm/{stackleak.c => kstack_erase.c}     | 26 +++++-----
 drivers/platform/x86/thinkpad_acpi.c          |  4 +-
 drivers/soc/ti/pm33xx.c                       |  2 +-
 fs/proc/base.c                                |  6 +--
 kernel/fork.c                                 |  2 +-
 kernel/{stackleak.c => kstack_erase.c}        | 22 ++++----
 tools/objtool/check.c                         |  4 +-
 tools/testing/selftests/lkdtm/config          |  2 +-
 MAINTAINERS                                   |  6 ++-
 kernel/configs/hardening.config               |  6 +++
 69 files changed, 203 insertions(+), 171 deletions(-)
 create mode 100644 scripts/Makefile.kstack_erase
 rename include/linux/{stackleak.h => kstack_erase.h} (81%)
 rename drivers/misc/lkdtm/{stackleak.c => kstack_erase.c} (89%)
 rename kernel/{stackleak.c => kstack_erase.c} (87%)

-- 
2.34.1