linux-kernel - Re: [PATCH 01/24] fix default __strnlen

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Message-ID: <1314905032.1439.29.camel@deneb.redhat.com>
Date:	Thu, 01 Sep 2011 15:23:51 -0400
From:	Mark Salter <msalter@...hat.com>
To:	Ryan Mallon <rmallon@...il.com>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 01/24] fix default __strnlen_user macro

On Thu, 2011-09-01 at 11:54 +1000, Ryan Mallon wrote:
> It should either be changed as I suggested, or the comment in uaccess.h 
> should be updated to reflect the actual behaviour of the function 
> (stating that it returns n + 1 in the case where n is reached). Either 
> way, its probably worth doing a quick check through the arch specific 
> versions to see what their behaviour really is. It looks like there are 
> potentially some subtle bugs at the callsites.

I think commenting it in uaccess.h is the only sane way to go. Changing
the semantics means changing all the arch-specific versions, most of
which are asm code and changing most, if not all callsites. All of the
arch-specific versions I looked at include the NULL count.

--Mark



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