From: Alexey Toptygin <alexeyt@freeshell.org>
To: Andi Kleen <ak@suse.de>
Cc: linux-kernel@vger.kernel.org, tony.luck@intel.com
Subject: Re: [PATCH] sendfile compat functions on x86_64 and ia64
Date: Fri, 5 May 2006 20:44:10 +0000 (UTC) [thread overview]
Message-ID: <Pine.NEB.4.62.0605052040250.27826@ukato.freeshell.org> (raw)
In-Reply-To: <200605052238.26834.ak@suse.de>
On Fri, 5 May 2006, Andi Kleen wrote:
> With your change there wouldn't be any sign extension and rw_verify_area
> couldn't reject negative values them anymore.
>
> I think it would be a wrong change because it would differ from a native
> 32bit kernel.
No...
On a 32 bit kernel (and on a 64 bit kernel using the native interface),
count is passed to sendfile as unsigned. rw_verify_area explicitly casts
to signed before checking for negativeness. The only place anywhere in the
kernel that count is signed (other than where rw_verify area explicitly
casts it for one test) is in the declaration of sys32_sendfile in the
x86_64 compat code. I'm pretty sure it's supposed to be unsigned there
too, and the current code is a typo.
Alexey
next prev parent reply other threads:[~2006-05-05 20:44 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-05-05 0:45 Alexey Toptygin
2006-05-05 20:38 ` Andi Kleen
2006-05-05 20:44 ` Alexey Toptygin [this message]
2006-05-05 21:28 ` Andi Kleen
2006-05-05 22:19 ` Alexey Toptygin
2006-05-06 8:46 ` Andi Kleen
2006-05-06 22:43 ` Alexey Toptygin
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