[v29,00/10] Control-flow Enforcement: Indirect Branch Tracking

Message

Yu-cheng Yu Aug. 20, 2021, 6:22 p.m. UTC

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 v29:
- Rebase to Linus tree v5.14-rc6.

Changes in v28:
- Patch #10: Update change log and comments.
- Rebase to Linus tree v5.14-rc2.

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

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