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Subject[PATCH 00/10] Control Flow Enforcement - Part (3)
Date
This series introduces CET - Shadow stack

At the high level, shadow stack is:

Allocated from a task's address space with vm_flags VM_SHSTK;
Its PTEs must be read-only and dirty;
Fixed sized, but the default size can be changed by sys admin.

For a forked child, the shadow stack is duplicated when the next
shadow stack access takes place.

For a pthread child, a new shadow stack is allocated.

The signal handler uses the same shadow stack as the main program.

Yu-cheng Yu (10):
x86/cet: User-mode shadow stack support
x86/cet: Introduce WRUSS instruction
x86/cet: Signal handling for shadow stack
x86/cet: Handle thread shadow stack
x86/cet: ELF header parsing of Control Flow Enforcement
x86/cet: Add arch_prctl functions for shadow stack
mm: Prevent mprotect from changing shadow stack
mm: Prevent mremap of shadow stack
mm: Prevent madvise from changing shadow stack
mm: Prevent munmap and remap_file_pages of shadow stack

arch/x86/Kconfig | 4 +
arch/x86/ia32/ia32_signal.c | 5 +
arch/x86/include/asm/cet.h | 48 ++++++
arch/x86/include/asm/disabled-features.h | 8 +-
arch/x86/include/asm/elf.h | 5 +
arch/x86/include/asm/mmu_context.h | 3 +
arch/x86/include/asm/msr-index.h | 14 ++
arch/x86/include/asm/processor.h | 5 +
arch/x86/include/asm/special_insns.h | 44 +++++
arch/x86/include/uapi/asm/elf_property.h | 16 ++
arch/x86/include/uapi/asm/prctl.h | 15 ++
arch/x86/include/uapi/asm/sigcontext.h | 4 +
arch/x86/kernel/Makefile | 4 +
arch/x86/kernel/cet.c | 224 ++++++++++++++++++++++++
arch/x86/kernel/cet_prctl.c | 203 ++++++++++++++++++++++
arch/x86/kernel/cpu/common.c | 24 +++
arch/x86/kernel/elf.c | 236 ++++++++++++++++++++++++++
arch/x86/kernel/process.c | 10 ++
arch/x86/kernel/process_64.c | 7 +
arch/x86/kernel/signal.c | 11 ++
arch/x86/lib/x86-opcode-map.txt | 2 +-
arch/x86/mm/fault.c | 13 +-
fs/binfmt_elf.c | 16 ++
fs/proc/task_mmu.c | 3 +
include/uapi/linux/elf.h | 1 +
mm/madvise.c | 9 +
mm/mmap.c | 13 ++
mm/mprotect.c | 9 +
mm/mremap.c | 5 +-
tools/objtool/arch/x86/lib/x86-opcode-map.txt | 2 +-
30 files changed, 958 insertions(+), 5 deletions(-)
create mode 100644 arch/x86/include/asm/cet.h
create mode 100644 arch/x86/include/uapi/asm/elf_property.h
create mode 100644 arch/x86/kernel/cet.c
create mode 100644 arch/x86/kernel/cet_prctl.c
create mode 100644 arch/x86/kernel/elf.c

--
2.15.1

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