linux-kernel - Re: [PATCH 1/1] initramfs: strcpy destination string overflow

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Date:	Wed, 06 Oct 2010 12:58:21 +0400
From:	Evgeny Kuznetsov <EXT-Eugeny.Kuznetsov@...ia.com>
To:	"ext H. Peter Anvin" <hpa@...or.com>
Cc:	Al Viro <viro@...IV.linux.org.uk>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	akpm@...ux-foundation.org, phillip@...gher.demon.co.uk,
	hsweeten@...ionengravers.com, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/1] initramfs: strcpy destination string overflow

On Tue, 2010-10-05 at 11:09 -0700, ext H. Peter Anvin wrote:
> On 10/05/2010 09:51 AM, Al Viro wrote:
> > 
> > Take a look at struct hash definition.  That sizeof is PATH_MAX and
> > do_header() will reject an entry with name longer than that.  IOW,
> > the whole thing is a non-issue; we can add
> > 	if (strlen(name) >= PATH_MAX)
> > 		BUG();
> > if we really care, but that's it.
> > 
> > As a side note, it looks like we need a fat warning about blind "improvements"
> > of that kind in CodingStyle; cargo-cult replacements like that can easily
> > hide real bugs... ;-/
> 
> BUG_ON(strlen(name) >= PATH_MAX);

Should it be:

BUG_ON(strlen(name) >= N_ALIGN(PATH_MAX));


-Evgeny
> 
> ... would work for me.
> 
> OK, not an issue...
> 
> 	-hpa


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