linux-kernel - [PATCH RFC 0/4] stackleak: Support Clang stack depth tracking

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Message-Id: <20250502185834.work.560-kees@kernel.org>
Date: Fri,  2 May 2025 12:01:23 -0700
From: Kees Cook <kees@...nel.org>
To: Arnd Bergmann <arnd@...db.de>
Cc: Kees Cook <kees@...nel.org>,
	linux-kernel@...r.kernel.org,
	x86@...nel.org,
	linux-doc@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	kvmarm@...ts.linux.dev,
	linux-riscv@...ts.infradead.org,
	linux-s390@...r.kernel.org,
	linux-efi@...r.kernel.org,
	linux-hardening@...r.kernel.org,
	linux-kbuild@...r.kernel.org,
	linux-security-module@...r.kernel.org,
	linux-kselftest@...r.kernel.org,
	sparclinux@...r.kernel.org,
	kasan-dev@...glegroups.com,
	llvm@...ts.linux.dev
Subject: [PATCH RFC 0/4] stackleak: Support Clang stack depth tracking

Hi,

As part of looking at what GCC plugins could be replaced with Clang
implementations, this series uses the recently proposed stack depth
tracking callback in Clang[1] to implement the stackleak feature.

-Kees

[1] https://github.com/llvm/llvm-project/pull/138323

Kees Cook (4):
  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

 Documentation/admin-guide/sysctl/kernel.rst |  2 +-
 Documentation/security/self-protection.rst  |  2 +-
 arch/arm/boot/compressed/Makefile           |  2 +-
 arch/arm/kernel/entry-common.S              |  2 +-
 arch/arm/vdso/Makefile                      |  2 +-
 arch/arm64/kernel/entry.S                   |  2 +-
 arch/arm64/kernel/pi/Makefile               |  2 +-
 arch/arm64/kernel/vdso/Makefile             |  1 +
 arch/arm64/kvm/hyp/nvhe/Makefile            |  2 +-
 arch/riscv/kernel/entry.S                   |  2 +-
 arch/riscv/kernel/pi/Makefile               |  2 +-
 arch/riscv/purgatory/Makefile               |  2 +-
 arch/s390/kernel/entry.S                    |  2 +-
 arch/sparc/vdso/Makefile                    |  3 +-
 arch/x86/entry/calling.h                    |  4 +-
 arch/x86/entry/vdso/Makefile                |  3 +-
 arch/x86/include/asm/init.h                 |  2 +-
 arch/x86/purgatory/Makefile                 |  2 +-
 drivers/firmware/efi/libstub/Makefile       |  6 +--
 drivers/misc/lkdtm/stackleak.c              |  8 ++--
 include/linux/init.h                        |  4 +-
 include/linux/sched.h                       |  4 +-
 include/linux/stackleak.h                   |  6 +--
 kernel/Makefile                             |  4 +-
 kernel/stackleak.c                          |  4 +-
 lib/Makefile                                |  2 +-
 scripts/Makefile.gcc-plugins                | 13 +++---
 scripts/Makefile.ubsan                      | 12 +++++
 scripts/gcc-plugins/stackleak_plugin.c      | 52 ++++++++++-----------
 security/Kconfig.hardening                  | 25 ++++++----
 tools/objtool/check.c                       |  2 +-
 tools/testing/selftests/lkdtm/config        |  2 +-
 32 files changed, 105 insertions(+), 78 deletions(-)

-- 
2.34.1