Re: Formal description of system call interface

From: Dmitry Vyukov
Date: Mon Nov 21 2016 - 10:18:11 EST

On Fri, Nov 11, 2016 at 6:10 PM, Andy Lutomirski <luto@xxxxxxxxxxxxxx> wrote:
> On Sun, Nov 6, 2016 at 2:39 PM, Dmitry Vyukov <dvyukov@xxxxxxxxxx> wrote:
>> Hello,
>> This is notes from the discussion we had at Linux Plumbers this week
>> regarding providing a formal description of system calls (user API).
>> The idea come up in the context of syzkaller, syscall fuzzer, which
>> has descriptions for 1000+ syscalls mostly concentrating on types of
>> arguments and return values. However, problems are that a small group
>> of people can't write descriptions for all syscalls; can't keep them
>> up-to-date and doesn't have necessary domain expertise to do correct
>> descriptions in some cases.
>> We identified a surprisingly large number of potential users for such
>> descriptions:
> Let me add one more: consolidation of all the incompatible arch
> syscall tables. A sufficiently descriptive format should be parseable
> at build time to generate the syscall tables.

Hi Andy,

What exactly info do we need for this?

Anything that just requires a bit of info per syscall looks like the
lowest hanging fruit
(as compared to info per every ioctl discrimination, and complete args