linux-kernel - Re: [PATCH] [3/6] kfifo: Sanitize *

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Date:	Mon, 28 Dec 2009 08:10:56 +0100
From:	Stefani Seibold <stefani@...bold.net>
To:	Andi Kleen <andi@...stfloor.org>
Cc:	linux-kernel@...r.kernel.org, akpm@...l.org
Subject: Re: [PATCH] [3/6] kfifo: Sanitize *_user error handling

Am Montag, den 28.12.2009, 00:34 +0100 schrieb Andi Kleen:
> > I don't like this idea. kfifo_from_user and kfifo_to_user should have
> > the same semantics as copy_from_user and copy_to_user. 
> 
> Maybe they should have, but the big difference is that the source
> FIFO might not have enough data. And both conditions need
> to be reported, but not mixed together.
> 
> The actual reporting of the unused length is not
> too useful anyways. It's only used very rarely for real
> c*u(), and these cases are usually misdesigned interfaces.
> 
> > > I didn't fully adapt the weird "record" variants, those seem 
> > > to be unused anyways and were rather messy (should they be just removed?)
> > > 
> > 
> > Believe it or not, it will be used in future. 
> 
> Normally in Linux code is only added when it's actually used.
> Otherwise it'll bitrot anyways.
> 

I know a lot of places and structures inside the kernel where it is not
this case. 

Stefani


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