netdev - Re: [PATCH] linux/types.h: enable endian checks for all sparse builds

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:   Thu, 8 Dec 2016 12:25:53 +0100
From:   Cornelia Huck <cornelia.huck@...ibm.com>
To:     "Michael S. Tsirkin" <mst@...hat.com>
Cc:     linux-kernel@...r.kernel.org,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Christoph Hellwig <hch@...radead.org>,
        Jason Wang <jasowang@...hat.com>, linux-kbuild@...r.kernel.org,
        Michal Marek <mmarek@...e.com>, Arnd Bergmann <arnd@...db.de>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Matt Mackall <mpm@...enic.com>,
        Herbert Xu <herbert@...dor.apana.org.au>,
        David Airlie <airlied@...ux.ie>,
        Gerd Hoffmann <kraxel@...hat.com>,
        Ohad Ben-Cohen <ohad@...ery.com>,
        Christian Borntraeger <borntraeger@...ibm.com>,
        "James E.J. Bottomley" <jejb@...ux.vnet.ibm.com>,
        "David S. Miller" <davem@...emloft.net>, Jens Axboe <axboe@...com>,
        Neil Armstrong <narmstrong@...libre.com>,
        Stefan Hajnoczi <stefanha@...hat.com>,
        Asias He <asias@...hat.com>, linux-crypto@...r.kernel.org,
        dri-devel@...ts.freedesktop.org,
        virtualization@...ts.linux-foundation.org, netdev@...r.kernel.org,
        linux-remoteproc@...r.kernel.org, linux-s390@...r.kernel.org,
        kvm@...r.kernel.org, linux-scsi@...r.kernel.org,
        v9fs-developer@...ts.sourceforge.net
Subject: Re: [PATCH] linux/types.h: enable endian checks for all sparse
 builds

On Thu, 8 Dec 2016 04:29:39 +0200
"Michael S. Tsirkin" <mst@...hat.com> wrote:

> By now, linux is mostly endian-clean. Enabling endian-ness
> checks for everyone produces about 200 new sparse warnings for me -
> less than 10% over the 2000 sparse warnings already there.

Out of curiousity: Where do most of those warnings show up?

> 
> Not a big deal, OTOH enabling this helps people notice
> they are introducing new bugs.
> 
> So let's just drop __CHECK_ENDIAN__. Follow-up patches
> can drop distinction between __bitwise and __bitwise__.
> 
> Cc: Linus Torvalds <torvalds@...ux-foundation.org>
> Suggested-by: Christoph Hellwig <hch@...radead.org>
> Signed-off-by: Michael S. Tsirkin <mst@...hat.com>
> ---
> 
> Linus, could you ack this for upstream? If yes I'll
> merge through my tree as a replacement for enabling
> this just for virtio.
> 
>  include/uapi/linux/types.h | 4 ----
>  1 file changed, 4 deletions(-)
> 
> diff --git a/include/uapi/linux/types.h b/include/uapi/linux/types.h
> index acf0979..41e5914 100644
> --- a/include/uapi/linux/types.h
> +++ b/include/uapi/linux/types.h
> @@ -23,11 +23,7 @@
>  #else
>  #define __bitwise__
>  #endif
> -#ifdef __CHECK_ENDIAN__
>  #define __bitwise __bitwise__
> -#else
> -#define __bitwise
> -#endif
> 
>  typedef __u16 __bitwise __le16;
>  typedef __u16 __bitwise __be16;

FWIW, I like this better than just enabling it for the virtio code.