syscall_get_arch() is required to be implemented on all architectures in order to extend the generic ptrace API with PTRACE_GET_SYSCALL_INFO request: syscall_get_arch() is going to be called from ptrace_request() along with syscall_get_nr(), syscall_get_arguments(), syscall_get_error(), and syscall_get_return_value() functions with a tracee as their argument.
The primary intent is that the triple (audit_arch, syscall_nr, arg1..arg6) should describe what system call is being called and what its arguments are. This patchset began as a series called "Prepare for PTRACE_GET_SYSCALL_INFO", then I merged it into a series called "ptrace: add PTRACE_GET_SYSCALL_INFO request" that also contains ptrace-specific changes. The ptrace-specific part, however, needs more attention to workaround problems on niche architectures like alpha, while the syscall_get_arch() part is straightforward, so I decided to split it out into a separate patchset that just prepares syscall_get_arch() for PTRACE_GET_SYSCALL_INFO: it adds syscall_get_arch() to those architectures that haven't implemented it yet, and then adds "struct task_struct *" argument to syscall_get_arch() on all architectures. All patches from this patchset have been already reviewed, so it's ready to be merged without waiting for the ptrace-specific part. As it's all about syscall_get_arch(), it should probably go via audit tree. Dmitry V. Levin (14): Move EM_ARCOMPACT and EM_ARCV2 to uapi/linux/elf-em.h arc: define syscall_get_arch() c6x: define syscall_get_arch() h8300: define syscall_get_arch() Move EM_HEXAGON to uapi/linux/elf-em.h hexagon: define syscall_get_arch() m68k: define syscall_get_arch() Move EM_NDS32 to uapi/linux/elf-em.h nds32: define syscall_get_arch() nios2: define syscall_get_arch() riscv: define syscall_get_arch() Move EM_UNICORE to uapi/linux/elf-em.h unicore32: define syscall_get_arch() syscall_get_arch: add "struct task_struct *" argument arch/alpha/include/asm/syscall.h | 2 +- arch/arc/include/asm/elf.h | 6 +----- arch/arc/include/asm/syscall.h | 11 +++++++++++ arch/arm/include/asm/syscall.h | 2 +- arch/arm64/include/asm/syscall.h | 4 ++-- arch/c6x/include/asm/syscall.h | 7 +++++++ arch/csky/include/asm/syscall.h | 2 +- arch/h8300/include/asm/syscall.h | 6 ++++++ arch/hexagon/include/asm/elf.h | 6 +----- arch/hexagon/include/asm/syscall.h | 8 ++++++++ arch/ia64/include/asm/syscall.h | 2 +- arch/m68k/include/asm/syscall.h | 12 ++++++++++++ arch/microblaze/include/asm/syscall.h | 2 +- arch/mips/include/asm/syscall.h | 6 +++--- arch/mips/kernel/ptrace.c | 2 +- arch/nds32/include/asm/elf.h | 3 +-- arch/nds32/include/asm/syscall.h | 9 +++++++++ arch/nios2/include/asm/syscall.h | 6 ++++++ arch/openrisc/include/asm/syscall.h | 2 +- arch/parisc/include/asm/syscall.h | 4 ++-- arch/powerpc/include/asm/syscall.h | 10 ++++++++-- arch/riscv/include/asm/syscall.h | 10 ++++++++++ arch/s390/include/asm/syscall.h | 4 ++-- arch/sh/include/asm/syscall_32.h | 2 +- arch/sh/include/asm/syscall_64.h | 2 +- arch/sparc/include/asm/syscall.h | 5 +++-- arch/unicore32/include/asm/elf.h | 3 +-- arch/unicore32/include/asm/syscall.h | 12 ++++++++++++ arch/x86/include/asm/syscall.h | 8 +++++--- arch/x86/um/asm/syscall.h | 2 +- arch/xtensa/include/asm/syscall.h | 2 +- include/asm-generic/syscall.h | 5 +++-- include/uapi/linux/audit.h | 14 ++++++++++++++ include/uapi/linux/elf-em.h | 6 ++++++ kernel/auditsc.c | 4 ++-- kernel/seccomp.c | 4 ++-- 36 files changed, 148 insertions(+), 47 deletions(-) create mode 100644 arch/m68k/include/asm/syscall.h create mode 100644 arch/unicore32/include/asm/syscall.h -- ldv
