linux-kernel - Re: [PATCH] lib: string.c: Added a funktion function strzcpy

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Message-ID: <20140924143555.GJ28253@tassilo.jf.intel.com>
Date:	Wed, 24 Sep 2014 07:35:55 -0700
From:	Andi Kleen <ak@...ux.intel.com>
To:	Dan Carpenter <dan.carpenter@...cle.com>
Cc:	Rickard Strandqvist <rickard_strandqvist@...ctrumdigital.se>,
	Grant Likely <grant.likely@...aro.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] lib: string.c:  Added a funktion function strzcpy

On Wed, Sep 24, 2014 at 10:52:06AM +0300, Dan Carpenter wrote:
> On Tue, Sep 23, 2014 at 06:17:53PM -0700, Andi Kleen wrote:
> > On Wed, Sep 24, 2014 at 12:13:36AM +0200, Rickard Strandqvist wrote:
> > > Added a function strzcpy which works the same as strncpy,
> > > but guaranteed to produce the trailing null character.
> > 
> > Do we really need the bizarre strncpy padding semantics for anything?
> > Why not just use strlcpy?
> 
> We do need the padding in many places to prevent information leaks.

Like where?

Usually explicit memset is far cleaner/safer.

-andi
-- 
ak@...ux.intel.com -- Speaking for myself only
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