netdev - Re: [RFC/HACK] net/compat/wext: allow sending different messages to compat tasks

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Date:	Mon, 22 Jun 2009 07:57:04 +0200
From:	Johannes Berg <johannes@...solutions.net>
To:	Arnd Bergmann <arnd@...db.de>
Cc:	linux-wireless@...r.kernel.org, netdev@...r.kernel.org
Subject: Re: [RFC/HACK] net/compat/wext: allow sending different messages
 to compat tasks

On Mon, 2009-06-22 at 00:03 +0200, Arnd Bergmann wrote:
> On Sunday 21 June 2009, Johannes Berg wrote:
> > --- wireless-testing.orig/net/compat.c  2009-06-19 17:50:30.000000000 +0200
> > +++ wireless-testing/net/compat.c       2009-06-19 17:53:13.000000000 +0200
> > @@ -782,16 +782,18 @@ asmlinkage long compat_sys_socketcall(in
> >                 ret = sys_socketpair(a0, a1, a[2], compat_ptr(a[3]));
> >                 break;
> >         case SYS_SEND:
> > -               ret = sys_send(a0, compat_ptr(a1), a[2], a[3]);
> > +               ret = sys_send(a0, compat_ptr(a1), a[2], a[3] | MSG_CMSG_COMPAT);
> >                 break;
> >         case SYS_SENDTO:
> > -               ret = sys_sendto(a0, compat_ptr(a1), a[2], a[3], compat_ptr(a[4]), a[5]);
> > +               ret = sys_sendto(a0, compat_ptr(a1), a[2], a[3] | MSG_CMSG_COMPAT,
> > +                                compat_ptr(a[4]), a[5]);
> >                 break;
> >         case SYS_RECV:
> > -               ret = sys_recv(a0, compat_ptr(a1), a[2], a[3]);
> > +               ret = sys_recv(a0, compat_ptr(a1), a[2], a[3] | MSG_CMSG_COMPAT);
> >                 break;
> >         case SYS_RECVFROM:
> > -               ret = sys_recvfrom(a0, compat_ptr(a1), a[2], a[3], compat_ptr(a[4]), compat_ptr(a[5]));
> > +               ret = sys_recvfrom(a0, compat_ptr(a1), a[2], a[3] | MSG_CMSG_COMPAT,
> > +                                  compat_ptr(a[4]), compat_ptr(a[5]));
> >                 break;
> >         case SYS_SHUTDOWN:
> >                 ret = sys_shutdown(a0,a1);
> 
> I suppose if you do this, you also need to introduce a
> compat_sys_{send,sendto,recv,recvfrom} entry point
> for architectures that do not go through sys_socket but
> call sys_{send,sendto,recv,recvfrom} directly. I think
> this is only sparc and mips.

Thanks, good catch, I'll take a look. Since I only care about recv(from)
I guess it would be better to only do those.

johannes

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