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 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 v26:
https://lore.kernel.org/r/20210427204720.25007-1-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 | 95 ++++++++++++++++++++++++
arch/x86/kernel/process_64.c | 8 ++
arch/x86/kernel/signal.c | 6 ++
15 files changed, 219 insertions(+), 6 deletions(-)
create mode 100644 arch/x86/kernel/ibt.c
--
2.21.0
