This patch enables secure computing (system call filtering) on arm64. System calls can be allowed or denied by loaded bpf-style rules. Architecture specific part is to run secure_computing() on syscall entry and check the result. See [2/3]
Prerequisites are: * "arm64: Add audit support" patch * "arm64: make a single hook to syscall_trace() for all syscall features" patch
This code is tested on ARMv8 fast model using libseccomp v2.1.1 with modifications for arm64 and verified by its "live" tests, 20, 21 and 24.
Changes v1 -> v2: * added generic seccomp.h for arm64 to utilize it [1,2/3] * changed syscall_trace() to return more meaningful value (-EPERM) on seccomp failure case [2/3] * aligned with the change in "arm64: make a single hook to syscall_trace() for all syscall features" v2 [2/3] * removed is_compat_task() definition from compat.h [3/3]
AKASHI Takahiro (3): asm-generic: Add generic seccomp.h for secure computing mode 1 arm64: Add seccomp support arm64: is_compat_task is defined both in asm/compat.h and linux/compat.h
arch/arm64/Kconfig | 17 +++++++++++++++++ arch/arm64/include/asm/compat.h | 5 ----- arch/arm64/include/asm/seccomp.h | 25 +++++++++++++++++++++++++ arch/arm64/include/asm/unistd.h | 3 +++ arch/arm64/kernel/entry.S | 4 ++++ arch/arm64/kernel/hw_breakpoint.c | 2 +- arch/arm64/kernel/process.c | 2 +- arch/arm64/kernel/ptrace.c | 8 +++++++- arch/arm64/kernel/signal.c | 2 +- include/asm-generic/seccomp.h | 28 ++++++++++++++++++++++++++++ 10 files changed, 87 insertions(+), 9 deletions(-) create mode 100644 arch/arm64/include/asm/seccomp.h create mode 100644 include/asm-generic/seccomp.h