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From: Sami Tolvanen <samitolvanen@google.com>
To: Kees Cook <keescook@chromium.org>
Cc: Nathan Chancellor <nathan@kernel.org>,
	Nick Desaulniers <ndesaulniers@google.com>,
	Masahiro Yamada <masahiroy@kernel.org>,
	Will Deacon <will@kernel.org>, Jessica Yu <jeyu@kernel.org>,
	Arnd Bergmann <arnd@arndb.de>, Tejun Heo <tj@kernel.org>,
	bpf@vger.kernel.org, linux-hardening@vger.kernel.org,
	linux-arch@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
	linux-kbuild@vger.kernel.org, linux-pci@vger.kernel.org,
	linux-kernel@vger.kernel.org,
	Sami Tolvanen <samitolvanen@google.com>
Subject: [PATCH 00/17] Add support for Clang CFI
Date: Thu, 11 Mar 2021 16:49:02 -0800
Message-ID: <20210312004919.669614-1-samitolvanen@google.com> (raw)

This series adds support for Clang's Control-Flow Integrity (CFI)
checking. With CFI, the compiler injects a runtime check before each
indirect function call to ensure the target is a valid function with
the correct static type. This restricts possible call targets and
makes it more difficult for an attacker to exploit bugs that allow the
modification of stored function pointers. For more details, see:

  https://clang.llvm.org/docs/ControlFlowIntegrity.html

The first patch contains build system changes and error handling,
and implements support for cross-module indirect call checking. The
remaining patches address issues caused by the compiler
instrumentation. These include fixing known type mismatches, as well
as issues with address space confusion and cross-module function
address equality.

These patches add support only for arm64, but I'll post patches also
for x86_64 after we address the remaining issues there, including
objtool support.

You can also pull this series from

  https://github.com/samitolvanen/linux.git cfi-v1


Sami Tolvanen (17):
  add support for Clang CFI
  cfi: add __cficanonical
  mm: add generic __va_function and __pa_function macros
  module: cfi: ensure __cfi_check alignment
  workqueue: cfi: disable callback pointer check with modules
  kthread: cfi: disable callback pointer check with modules
  kallsyms: cfi: strip hashes from static functions
  bpf: disable CFI in dispatcher functions
  lib/list_sort: fix function type mismatches
  lkdtm: use __va_function
  psci: use __pa_function for cpu_resume
  arm64: implement __va_function
  arm64: use __pa_function
  arm64: add __nocfi to functions that jump to a physical address
  arm64: add __nocfi to __apply_alternatives
  KVM: arm64: Disable CFI for nVHE
  arm64: allow CONFIG_CFI_CLANG to be selected

 Makefile                                  |  17 ++
 arch/Kconfig                              |  45 +++
 arch/arm64/Kconfig                        |   1 +
 arch/arm64/include/asm/memory.h           |  15 +
 arch/arm64/include/asm/mmu_context.h      |   4 +-
 arch/arm64/kernel/acpi_parking_protocol.c |   2 +-
 arch/arm64/kernel/alternative.c           |   4 +-
 arch/arm64/kernel/cpu-reset.h             |  10 +-
 arch/arm64/kernel/cpufeature.c            |   4 +-
 arch/arm64/kernel/psci.c                  |   3 +-
 arch/arm64/kernel/smp_spin_table.c        |   2 +-
 arch/arm64/kvm/hyp/nvhe/Makefile          |   6 +-
 drivers/firmware/psci/psci.c              |   4 +-
 drivers/misc/lkdtm/usercopy.c             |   2 +-
 include/asm-generic/vmlinux.lds.h         |  20 +-
 include/linux/bpf.h                       |   4 +-
 include/linux/cfi.h                       |  41 +++
 include/linux/compiler-clang.h            |   3 +
 include/linux/compiler_types.h            |   8 +
 include/linux/init.h                      |   6 +-
 include/linux/mm.h                        |   8 +
 include/linux/module.h                    |  13 +-
 include/linux/pci.h                       |   4 +-
 init/Kconfig                              |   2 +-
 kernel/Makefile                           |   4 +
 kernel/cfi.c                              | 329 ++++++++++++++++++++++
 kernel/kallsyms.c                         |  54 +++-
 kernel/kthread.c                          |   8 +-
 kernel/module.c                           |  43 +++
 kernel/workqueue.c                        |   9 +-
 lib/list_sort.c                           |   8 +-
 scripts/Makefile.modfinal                 |   2 +-
 scripts/module.lds.S                      |  14 +-
 33 files changed, 655 insertions(+), 44 deletions(-)
 create mode 100644 include/linux/cfi.h
 create mode 100644 kernel/cfi.c


base-commit: 28806e4d9b97865b450d72156e9ad229f2067f0b
-- 
2.31.0.rc2.261.g7f71774620-goog


             reply index

Thread overview: 42+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-03-12  0:49 Sami Tolvanen [this message]
2021-03-12  0:49 ` [PATCH 01/17] add " Sami Tolvanen
2021-03-12  2:39   ` Kees Cook
2021-03-12  0:49 ` [PATCH 02/17] cfi: add __cficanonical Sami Tolvanen
2021-03-12  2:40   ` Kees Cook
2021-03-12 20:28   ` Bjorn Helgaas
2021-03-12  0:49 ` [PATCH 03/17] mm: add generic __va_function and __pa_function macros Sami Tolvanen
2021-03-12  2:40   ` Kees Cook
2021-03-12  0:49 ` [PATCH 04/17] module: cfi: ensure __cfi_check alignment Sami Tolvanen
2021-03-12  2:39   ` Kees Cook
2021-03-16 20:03     ` Sami Tolvanen
2021-03-12  0:49 ` [PATCH 05/17] workqueue: cfi: disable callback pointer check with modules Sami Tolvanen
2021-03-12  2:43   ` Kees Cook
2021-03-12  0:49 ` [PATCH 06/17] kthread: " Sami Tolvanen
2021-03-12  2:43   ` Kees Cook
2021-03-12  6:13   ` Christoph Hellwig
2021-03-17 16:05     ` Sami Tolvanen
2021-03-12  0:49 ` [PATCH 07/17] kallsyms: cfi: strip hashes from static functions Sami Tolvanen
2021-03-12  2:45   ` Kees Cook
2021-03-16 20:33     ` Sami Tolvanen
2021-03-12  0:49 ` [PATCH 08/17] bpf: disable CFI in dispatcher functions Sami Tolvanen
2021-03-12  2:45   ` Kees Cook
2021-03-12  0:49 ` [PATCH 09/17] lib/list_sort: fix function type mismatches Sami Tolvanen
2021-03-12  2:45   ` Kees Cook
2021-03-12  0:49 ` [PATCH 10/17] lkdtm: use __va_function Sami Tolvanen
2021-03-12  2:45   ` Kees Cook
2021-03-12  0:49 ` [PATCH 11/17] psci: use __pa_function for cpu_resume Sami Tolvanen
2021-03-12  2:45   ` Kees Cook
2021-03-12  0:49 ` [PATCH 12/17] arm64: implement __va_function Sami Tolvanen
2021-03-12  2:46   ` Kees Cook
2021-03-12  0:49 ` [PATCH 13/17] arm64: use __pa_function Sami Tolvanen
2021-03-12  2:46   ` Kees Cook
2021-03-12  0:49 ` [PATCH 14/17] arm64: add __nocfi to functions that jump to a physical address Sami Tolvanen
2021-03-12  2:47   ` Kees Cook
2021-03-12  0:49 ` [PATCH 15/17] arm64: add __nocfi to __apply_alternatives Sami Tolvanen
2021-03-12  2:50   ` Kees Cook
2021-03-12  0:49 ` [PATCH 16/17] KVM: arm64: Disable CFI for nVHE Sami Tolvanen
2021-03-12  2:50   ` Kees Cook
2021-03-12  0:49 ` [PATCH 17/17] arm64: allow CONFIG_CFI_CLANG to be selected Sami Tolvanen
2021-03-12  2:51   ` Kees Cook
2021-03-16 20:44     ` Sami Tolvanen
2021-03-16 23:02       ` Kees Cook

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