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Date:   Sun, 17 Mar 2019 11:20:06 -0700
From:   Deepa Dinamani <deepa.kernel@...il.com>
To:     Florian Weimer <fw@...eb.enyo.de>
Cc:     Arnd Bergmann <arnd@...db.de>,
        "David S . Miller" <davem@...emloft.net>,
        Willem de Bruijn <willemb@...gle.com>,
        alpha <linux-alpha@...r.kernel.org>,
        linux-arch <linux-arch@...r.kernel.org>,
        linux-mips@...r.kernel.org,
        Parisc List <linux-parisc@...r.kernel.org>,
        sparclinux <sparclinux@...r.kernel.org>,
        Laura Abbott <labbott@...hat.com>,
        Networking <netdev@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Linux API <linux-api@...r.kernel.org>
Subject: Re: [PATCH] y2038: fix socket.h header inclusion

On Fri, Mar 15, 2019 at 2:20 PM Florian Weimer <fw@...eb.enyo.de> wrote:
>
> * Arnd Bergmann:
>
> > On Thu, Mar 14, 2019 at 7:41 PM Florian Weimer <fw@...eb.enyo.de> wrote:
> >>
> >> * Arnd Bergmann:
> >>
> >> > diff --git a/arch/alpha/include/uapi/asm/socket.h
> >> > b/arch/alpha/include/uapi/asm/socket.h
> >> > index 0d0fddb7e738..976e89b116e5 100644
> >> > --- a/arch/alpha/include/uapi/asm/socket.h
> >> > +++ b/arch/alpha/include/uapi/asm/socket.h
> >> > @@ -2,8 +2,8 @@
> >> >  #ifndef _UAPI_ASM_SOCKET_H
> >> >  #define _UAPI_ASM_SOCKET_H
> >> >
> >> > +#include <linux/posix_types.h>
> >> >  #include <asm/sockios.h>
> >> > -#include <asm/bitsperlong.h>
> >>
> >> This breaks POSIX conformance in glibc because the
> >> <linux/posix_types.h> header is not namespace clean.  It contains the
> >> identifiers fds_bits and val:
> >>
> >>         unsigned long fds_bits[__FD_SETSIZE / (8 * sizeof(long))];
> >>
> >>         int     val[2];
> >
> > What is problematic about the struct members here? I had thought that
> > only the struct names have to be in a namespace to be usable here,
> > but not the members.
>
> According POSIX, a user can do this:
>
> #define fds_bits 1024
>
> before including the <sys/socket.h> header file.  Similarly for val.
>
> Since glibc pulls in <asm/socket.h> indirectly, the result is a parse
> error, even though the programmer did nothing wrong (fds_bits is not
> an identifier used by POSIX, nor is it in the implementation
> namespace, ans <sys/socket.h> is a POSIX header).
>
> > We could use asm/posix_types.h instead of linux/posix_types.h,
> > would that address your concern?
>
> It should fix the fds_bits case, I think.  But
> <asm-generic/posix_types.h> still uses val, so that part of the issue
> remains.

Would moving kernel namespace types(__kernel prefix) to a different
header file(kernel_types.h?) and then including this from
linux/posix_types.h.
And, for socket.h just including kernel_types.h make sense?

-Deepa

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