linux-kernel - [PATCH v5 00/11] Control Flow Enforcement: Branch Tracking, PTRACE

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Date:   Thu, 11 Oct 2018 08:16:43 -0700
From:   Yu-cheng Yu <yu-cheng.yu@...el.com>
To:     x86@...nel.org, "H. Peter Anvin" <hpa@...or.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, linux-kernel@...r.kernel.org,
        linux-doc@...r.kernel.org, linux-mm@...ck.org,
        linux-arch@...r.kernel.org, linux-api@...r.kernel.org,
        Arnd Bergmann <arnd@...db.de>,
        Andy Lutomirski <luto@...capital.net>,
        Balbir Singh <bsingharora@...il.com>,
        Cyrill Gorcunov <gorcunov@...il.com>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Eugene Syromiatnikov <esyr@...hat.com>,
        Florian Weimer <fweimer@...hat.com>,
        "H.J. Lu" <hjl.tools@...il.com>, Jann Horn <jannh@...gle.com>,
        Jonathan Corbet <corbet@....net>,
        Kees Cook <keescook@...omium.org>,
        Mike Kravetz <mike.kravetz@...cle.com>,
        Nadav Amit <nadav.amit@...il.com>,
        Oleg Nesterov <oleg@...hat.com>, Pavel Machek <pavel@....cz>,
        Peter Zijlstra <peterz@...radead.org>,
        Randy Dunlap <rdunlap@...radead.org>,
        "Ravi V. Shankar" <ravi.v.shankar@...el.com>,
        Vedvyas Shanbhogue <vedvyas.shanbhogue@...el.com>
Cc:     Yu-cheng Yu <yu-cheng.yu@...el.com>
Subject: [PATCH v5 00/11] Control Flow Enforcement: Branch Tracking, PTRACE

The previous version of CET Branch Tracking/PTRACE patches is at the following
link:

  https://lkml.org/lkml/2018/9/21/773

Summary of changes from v4:

  Add ENDBR32/ENDBR64 to vsyscall assembly code.
  Small cleanups.
  Small fixes in IBT bitmap allocation.

  From the discussion of IBT bitmap size, I got:

    1. There are potential issues from using TASK_SIZE/TASK_SIZE_MAX;
    2. We cannot always depend on in_compat_syscall();
    3. Doing allocation in the kernel is tricky;

    The bitmap is needed only when an app does dlopen() non-IBT .so
    files; most applications do not need it.

    I am proposing that dlopen() does mmap() and passes the bitmap to
    the kernel.  If that is accepted, we can change these patches
    accordingly.

H.J. Lu (3):
  x86: Insert endbr32/endbr64 to vDSO
  x86/vsyscall/32: Add ENDBR32 to vsyscall entry point
  x86/vsyscall/64: Add ENDBR64 to vsyscall entry points

Yu-cheng Yu (8):
  x86/cet/ibt: Add Kconfig option for user-mode Indirect Branch Tracking
  x86/cet/ibt: User-mode indirect branch tracking support
  x86/cet/ibt: Add IBT legacy code bitmap allocation function
  mm/mmap: Add IBT bitmap size to address space limit check
  x86/cet/ibt: ELF header parsing for IBT
  x86/cet/ibt: Add arch_prctl functions for IBT
  x86/cet/ibt: Add ENDBR to op-code-map
  x86/cet: Add PTRACE interface for CET

 arch/x86/Kconfig                              | 16 ++++
 arch/x86/Makefile                             |  7 ++
 arch/x86/entry/vdso/.gitignore                |  4 +
 arch/x86/entry/vdso/Makefile                  | 12 ++-
 arch/x86/entry/vdso/vdso-layout.lds.S         |  1 +
 arch/x86/entry/vdso/vdso32/system_call.S      |  3 +
 arch/x86/entry/vsyscall/vsyscall_emu_64.S     |  9 +++
 arch/x86/include/asm/cet.h                    |  8 ++
 arch/x86/include/asm/disabled-features.h      |  8 +-
 arch/x86/include/asm/fpu/regset.h             |  7 +-
 arch/x86/include/asm/mmu_context.h            |  7 ++
 arch/x86/include/uapi/asm/elf_property.h      |  1 +
 arch/x86/include/uapi/asm/prctl.h             |  1 +
 arch/x86/kernel/cet.c                         | 78 +++++++++++++++++++
 arch/x86/kernel/cet_prctl.c                   | 35 +++++++++
 arch/x86/kernel/cpu/common.c                  | 17 ++++
 arch/x86/kernel/elf.c                         |  5 ++
 arch/x86/kernel/fpu/regset.c                  | 41 ++++++++++
 arch/x86/kernel/process.c                     |  1 +
 arch/x86/kernel/ptrace.c                      | 16 ++++
 arch/x86/lib/x86-opcode-map.txt               | 13 +++-
 include/uapi/linux/elf.h                      |  1 +
 mm/mmap.c                                     | 19 ++++-
 tools/objtool/arch/x86/lib/x86-opcode-map.txt | 13 +++-
 24 files changed, 313 insertions(+), 10 deletions(-)

-- 
2.17.1