[PATCH v26 0/9] Control-flow Enforcement: Indirect Branch Tracking

Yu-cheng Yu
2021-04-27T20:48:01Z

Control-flow Enforcement (CET) is a new Intel processor feature that blocks
return/jump-oriented programming attacks. Details are in "Intel 64 and
IA-32 Architectures Software Developer's Manual" [1].

This is the second part of CET and enables Indirect Branch Tracking (IBT).
It is built on top of the shadow stack series.

Changes in v26:
- Rebase to Linus tree v5.12.

Changes in v25:
- Make updates to Kconfig and CPU feature flags for the removal of Kconfig
X86_CET and software-defined X86_FEATURE_CET.
- Update ENDBR definition.
- Rebase to Linus tree v5.12-rc7.

[1] Intel 64 and IA-32 Architectures Software Developer's Manual:

https://software.intel.com/en-us/download/intel-64-and-ia-32-
architectures-sdm-combined-volumes-1-2a-2b-2c-2d-3a-3b-3c-3d-and-4

[2] Indirect Branch Tracking patches v25:

https://lore.kernel.org/r/20210415221734.32628-1-yu-cheng.yu@intel.com/

H.J. Lu (3):
x86/cet/ibt: Update arch_prctl functions for Indirect Branch Tracking
x86/vdso: Insert endbr32/endbr64 to vDSO
x86/vdso/32: Add ENDBR to __kernel_vsyscall entry point

Yu-cheng Yu (6):
x86/cet/ibt: Add Kconfig option for Indirect Branch Tracking
x86/cet/ibt: Add user-mode Indirect Branch Tracking support
x86/cet/ibt: Handle signals for Indirect Branch Tracking
x86/cet/ibt: Update ELF header parsing for Indirect Branch Tracking
x86/vdso: Introduce ENDBR macro
x86/vdso: Add ENDBR to __vdso_sgx_enter_enclave

arch/x86/Kconfig | 21 +++++++++
arch/x86/entry/vdso/Makefile | 4 ++
arch/x86/entry/vdso/vdso32/system_call.S | 2 +
arch/x86/entry/vdso/vsgx.S | 4 ++
arch/x86/include/asm/cet.h | 9 ++++
arch/x86/include/asm/disabled-features.h | 8 +++-
arch/x86/include/asm/vdso.h | 20 ++++++++-
arch/x86/include/uapi/asm/sigcontext.h | 1 +
arch/x86/kernel/Makefile | 1 +
arch/x86/kernel/cet_prctl.c | 5 +++
arch/x86/kernel/fpu/signal.c | 33 ++++++++++++--
arch/x86/kernel/ibt.c | 57 ++++++++++++++++++++++++
arch/x86/kernel/process_64.c | 8 ++++
13 files changed, 168 insertions(+), 5 deletions(-)
create mode 100644 arch/x86/kernel/ibt.c

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2.21.0