linux-kernel - Re: [PATCH] posix_types.h: make _

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:	Tue, 24 Jul 2012 15:41:24 -0400
From:	Josh Boyer <jwboyer@...hat.com>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Jeff Law <law@...hat.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] posix_types.h: make __NFDBITS match glibc definition

On Tue, Jul 24, 2012 at 12:37:36PM -0700, Linus Torvalds wrote:
> On Tue, Jul 24, 2012 at 12:19 PM, Jeff Law <law@...hat.com> wrote:
> >
> > All that's strictly necessary is that cast to (int).  That avoids the
> > problem.
> 
> .. and it causes other problems instead, namely the crap code generation for __.
> 
> Apparently glibc fixed it totally differently, and the kernel actually
> doesn't care at all. We'd probably be best off just removing those
> #defines entirely. Especially since the kernel doesn't even *use*
> those things.
> 
> The kernel _does_ have these odd #define's in <linux/time.h>:
> 
>   #define NFDBITS                 __NFDBITS
> 
>   #define FD_SETSIZE              __FD_SETSIZE
>   #define FD_SET(fd,fdsetp)       __FD_SET(fd,fdsetp)
>   #define FD_CLR(fd,fdsetp)       __FD_CLR(fd,fdsetp)
>   #define FD_ISSET(fd,fdsetp)     __FD_ISSET(fd,fdsetp)
>   #define FD_ZERO(fdsetp)         __FD_ZERO(fdsetp)
> 
> but apart from __NFDBITS and __FD_SETSIZE, the kernel doesn't even
> seem to define those __FD_xyx macros at all (although possibly they
> are hiding in some odd auto-generated headers, I didn't check). I
> think this is all silly left-overs that nobody really wants any more.
> glibc clearly doesn't.

I'd be happy to come up with a patch that drops them, but since they're
in a user visible header file I was concerned somebody might be using
them explicitly from posix_types.h.  People do weird crap like not use
glibc all the time.

josh
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/