Re: [RFC 0/3] ABI spec - verification
From: Thomas Gleixner
Date: Wed Nov 16 2016 - 12:49:25 EST
On Wed, 16 Nov 2016, alexander.levin@xxxxxxxxxxx wrote:
Cc'ed Nicholas McGuire
> As discussed at plumbers, having a standard spec for the kernel's ABI has
> quite a few uses and enough people wanted it to get the ball rolling.
> We agreed that it's desirable to have something that can be used from code
> rather than just a spec on paper both for validation and allowing other users
> (like fuzzers, userspace libraries, and various userspace tools) to build
> on that.
> What we ended up deciding on at plumbers is:
> - I'll do a few kernel bits do demonstrate how we can validate the spec from
> the kernel.
> - Dmitry Vyukov will provide a way to translate syzkaller's syscall
> documentation into something that can be easily used in the kernel and
> - Various projects will attempt to integrate it to make sure that the
> framework works for them.
> Once those bits are done we can focus on getting the spec right, and we'll
> have a good way to validate our work both in userspace and in the kernel.
> This patchset is a basic draft of said kernel bits. I mostly want to make
> sure that Dmitry and myself are on the same page as to how integration will
> look like, but also to open it to criticism and suggestions (bikeshedding).
> Sasha Levin (3):
> abi_spec: basic definitions of constraints, args and syscalls
> abi_spec: hooks into syscall to allow pre and post checking
> abi_spec: example spec for open(), placeholder for rest of syscalls
> include/linux/syscalls.h | 7 +-
> include/uapi/linux/abi_spec.h | 58 ++++++
> kernel/Makefile | 2 +
> kernel/abi_spec.c | 456 ++++++++++++++++++++++++++++++++++++++++++
> 4 files changed, 522 insertions(+), 1 deletion(-)
> create mode 100644 include/uapi/linux/abi_spec.h
> create mode 100644 kernel/abi_spec.c