Re: io_uring vs in_compat_syscall()

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On Tue, Jul 21, 2020 at 7:34 AM Christoph Hellwig <hch@xxxxxx> wrote:
>
> On Tue, Jul 21, 2020 at 07:31:02AM -0700, Andy Lutomirski wrote:
> > > What do you mean with "properly wired up".  Do you really want to spread
> > > ->compat_foo methods everywhere, including read and write?  I found
> > > in_compat_syscall() a lot small and easier to maintain than all the
> > > separate compat cruft.
> >
> > I was imagining using a flag.  Some of the net code uses
> > MSG_CMSG_COMPAT for this purpose.
>
> Killing that nightmarish monster is what actually got me into looking
> io_uring and starting this thread.

I agree that MSG_CMSG_COMPAT is nasty, but I think the concept is
sound -- rather than tracking whether we're compat by using a
different function or a per-thread variable, actually explicitly
tracking the mode seems sensible.

If we're going to play in_compat_syscall() games, let's please make
io_uring_enter() return -EINVAL if in_compat_syscall() != ctx->compat.

--Andy



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