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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>,
	"Paul E. McKenney" <paulmck@kernel.org>,
	Christoph Hellwig <hch@infradead.org>,
	Peter Zijlstra <peterz@infradead.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 v3 00/17] Add support for Clang CFI
Date: Tue, 23 Mar 2021 13:39:29 -0700	[thread overview]
Message-ID: <20210323203946.2159693-1-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-v3

---
Changes in v3:
 - Added a patch to change list_sort() callers treewide to use
   const pointers instead of simply removing the internal casts.
 - Changed cleanup_symbol_name() to return bool.
 - Changed module.lds.S to drop the .eh_frame section only with
   CONFIG_CFI_CLANG.
 - Switched to synchronize_rcu() in update_shadow().

Changes in v2:
 - Fixed .text merging in module.lds.S.
 - Added WARN_ON_FUNCTION_MISMATCH() and changed kernel/thread.c
   and kernel/workqueue.c to use the macro instead.


Sami Tolvanen (17):
  add support for Clang CFI
  cfi: add __cficanonical
  mm: add generic __va_function and __pa_function macros
  module: ensure __cfi_check alignment
  workqueue: use WARN_ON_FUNCTION_MISMATCH
  kthread: use WARN_ON_FUNCTION_MISMATCH
  kallsyms: strip ThinLTO hashes from static functions
  bpf: disable CFI in dispatcher functions
  treewide: Change list_sort to use const pointers
  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 +-
 arch/arm64/kvm/vgic/vgic-its.c                |   8 +-
 arch/arm64/kvm/vgic/vgic.c                    |   3 +-
 block/blk-mq-sched.c                          |   3 +-
 block/blk-mq.c                                |   3 +-
 drivers/acpi/nfit/core.c                      |   3 +-
 drivers/acpi/numa/hmat.c                      |   3 +-
 drivers/clk/keystone/sci-clk.c                |   4 +-
 drivers/firmware/psci/psci.c                  |   4 +-
 drivers/gpu/drm/drm_modes.c                   |   3 +-
 drivers/gpu/drm/i915/gt/intel_engine_user.c   |   3 +-
 drivers/gpu/drm/i915/gvt/debugfs.c            |   2 +-
 drivers/gpu/drm/i915/selftests/i915_gem_gtt.c |   3 +-
 drivers/gpu/drm/radeon/radeon_cs.c            |   4 +-
 .../hw/usnic/usnic_uiom_interval_tree.c       |   3 +-
 drivers/interconnect/qcom/bcm-voter.c         |   2 +-
 drivers/md/raid5.c                            |   3 +-
 drivers/misc/lkdtm/usercopy.c                 |   2 +-
 drivers/misc/sram.c                           |   4 +-
 drivers/nvme/host/core.c                      |   3 +-
 .../controller/cadence/pcie-cadence-host.c    |   3 +-
 drivers/spi/spi-loopback-test.c               |   3 +-
 fs/btrfs/raid56.c                             |   3 +-
 fs/btrfs/tree-log.c                           |   3 +-
 fs/btrfs/volumes.c                            |   3 +-
 fs/ext4/fsmap.c                               |   4 +-
 fs/gfs2/glock.c                               |   3 +-
 fs/gfs2/log.c                                 |   2 +-
 fs/gfs2/lops.c                                |   3 +-
 fs/iomap/buffered-io.c                        |   3 +-
 fs/ubifs/gc.c                                 |   7 +-
 fs/ubifs/replay.c                             |   4 +-
 fs/xfs/scrub/bitmap.c                         |   4 +-
 fs/xfs/xfs_bmap_item.c                        |   4 +-
 fs/xfs/xfs_buf.c                              |   6 +-
 fs/xfs/xfs_extent_busy.c                      |   4 +-
 fs/xfs/xfs_extent_busy.h                      |   3 +-
 fs/xfs/xfs_extfree_item.c                     |   4 +-
 fs/xfs/xfs_refcount_item.c                    |   4 +-
 fs/xfs/xfs_rmap_item.c                        |   4 +-
 include/asm-generic/bug.h                     |  16 +
 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/list_sort.h                     |   7 +-
 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                             |  55 ++-
 kernel/kthread.c                              |   3 +-
 kernel/module.c                               |  43 +++
 kernel/workqueue.c                            |   2 +-
 lib/list_sort.c                               |  17 +-
 lib/test_list_sort.c                          |   3 +-
 net/tipc/name_table.c                         |   4 +-
 scripts/Makefile.modfinal                     |   2 +-
 scripts/module.lds.S                          |  20 +-
 74 files changed, 752 insertions(+), 112 deletions(-)
 create mode 100644 include/linux/cfi.h
 create mode 100644 kernel/cfi.c


base-commit: 7acac4b3196caee5e21fb5ea53f8bc124e6a16fc
-- 
2.31.0.291.g576ba9dcdaf-goog


             reply	other threads:[~2021-03-23 20:40 UTC|newest]

Thread overview: 35+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-03-23 20:39 Sami Tolvanen [this message]
2021-03-23 20:39 ` [PATCH v3 01/17] add " Sami Tolvanen
2021-03-23 20:39 ` [PATCH v3 02/17] cfi: add __cficanonical Sami Tolvanen
2021-03-24 15:31   ` Rasmus Villemoes
2021-03-24 16:38     ` Sami Tolvanen
2021-03-23 20:39 ` [PATCH v3 03/17] mm: add generic __va_function and __pa_function macros Sami Tolvanen
2021-03-24  7:13   ` Christoph Hellwig
2021-03-24 15:54     ` Sami Tolvanen
2021-03-25 10:16       ` Mark Rutland
2021-03-25 23:17         ` Sami Tolvanen
2021-03-23 20:39 ` [PATCH v3 04/17] module: ensure __cfi_check alignment Sami Tolvanen
2021-03-26  4:34   ` Kees Cook
2021-03-29  9:26   ` Jessica Yu
2021-03-23 20:39 ` [PATCH v3 05/17] workqueue: use WARN_ON_FUNCTION_MISMATCH Sami Tolvanen
2021-03-26  4:34   ` Kees Cook
2021-03-23 20:39 ` [PATCH v3 06/17] kthread: " Sami Tolvanen
2021-03-26  4:35   ` Kees Cook
2021-03-23 20:39 ` [PATCH v3 07/17] kallsyms: strip ThinLTO hashes from static functions Sami Tolvanen
2021-03-23 20:39 ` [PATCH v3 08/17] bpf: disable CFI in dispatcher functions Sami Tolvanen
2021-03-23 20:39 ` [PATCH v3 09/17] treewide: Change list_sort to use const pointers Sami Tolvanen
2021-03-23 21:28   ` Nick Desaulniers
2021-03-24  7:10   ` Christoph Hellwig
2021-03-26  4:35   ` Kees Cook
2021-03-23 20:39 ` [PATCH v3 10/17] lkdtm: use __va_function Sami Tolvanen
2021-03-23 20:39 ` [PATCH v3 11/17] psci: use __pa_function for cpu_resume Sami Tolvanen
2021-03-25 10:23   ` Mark Rutland
2021-03-23 20:39 ` [PATCH v3 12/17] arm64: implement __va_function Sami Tolvanen
2021-03-25 10:37   ` Mark Rutland
2021-03-25 23:27     ` Sami Tolvanen
2021-03-26  0:03       ` Peter Collingbourne
2021-03-23 20:39 ` [PATCH v3 13/17] arm64: use __pa_function Sami Tolvanen
2021-03-23 20:39 ` [PATCH v3 14/17] arm64: add __nocfi to functions that jump to a physical address Sami Tolvanen
2021-03-23 20:39 ` [PATCH v3 15/17] arm64: add __nocfi to __apply_alternatives Sami Tolvanen
2021-03-23 20:39 ` [PATCH v3 16/17] KVM: arm64: Disable CFI for nVHE Sami Tolvanen
2021-03-23 20:39 ` [PATCH v3 17/17] arm64: allow CONFIG_CFI_CLANG to be selected Sami Tolvanen

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