[PATCH v28 00/10] Control-flow Enforcement: Indirect Branch Tracking

From: Yu-cheng Yu
Date: Thu Jul 22 2021 - 16:58:13 EST


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 v28:
- Patch #10: Update change log and comments.

Changes in v27:
- Use a ucontext flag to save/restore IBT status.
- Disable IBT support for IA32.
- Rebase to Linus tree v5.13-rc2.

[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 v27:

https://lore.kernel.org/r/20210521221531.30168-1-yu-cheng.yu@xxxxxxxxx/

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 (7):
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: Disable IBT for ia32
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 | 19 +++++
arch/x86/entry/vdso/Makefile | 4 +
arch/x86/entry/vdso/vdso32/system_call.S | 2 +
arch/x86/entry/vdso/vsgx.S | 4 +
arch/x86/ia32/ia32_signal.c | 22 +++++-
arch/x86/include/asm/cet.h | 13 ++++
arch/x86/include/asm/disabled-features.h | 8 +-
arch/x86/include/asm/elf.h | 13 +++-
arch/x86/include/asm/vdso.h | 20 ++++-
arch/x86/include/uapi/asm/ucontext.h | 5 ++
arch/x86/kernel/Makefile | 1 +
arch/x86/kernel/cet_prctl.c | 5 ++
arch/x86/kernel/ibt.c | 99 ++++++++++++++++++++++++
arch/x86/kernel/process_64.c | 6 ++
arch/x86/kernel/signal.c | 6 ++
15 files changed, 221 insertions(+), 6 deletions(-)
create mode 100644 arch/x86/kernel/ibt.c

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2.21.0