Re: [RFC v2] ptrace, pidfd: add pidfd_ptrace syscall

[Linus Torvalds]

On Mon, Apr 27, 2020 at 9:17 PM Andy Lutomirski <luto@xxxxxxxxxxxxxx> wrote:
>
> I hate to say this, but Iâm not convinced that asking the gdb folks is
> the right approach. GDB has an ancient architecture and is
> *incredibly* buggy. Iâm sure ptrace is somewhere on the pain point
> list, but I suspect itâs utterly dwarfed by everything else.

You may be right. However, if gdbn isn't going to use it, then I
seriously don't think it's worth changing much.

It might be worth looking at people who don't use ptrace() for
debugging, but for "incidental" reasons. IOW sandboxing, tracing,
things like that.

Maybe those people want things that are simpler and don't actually
need the kinds of hard serialization that ptrace() wants.

I'd rather add a few really simple things that might not be a full
complement of operations for a debugger, but exactly because they
aren't a full debugger, maybe they are things that we can tell are
obviously secure and simple?

               Linus