linux-kernel - Re: [PATCH] string: Improve the generic strlcpy() implementation

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Date:	Mon, 5 Oct 2015 18:13:32 +0200
From:	Ingo Molnar <mingo@...nel.org>
To:	Alexey Dobriyan <adobriyan@...il.com>
Cc:	cmetcalf@...hip.com, Linux Kernel <linux-kernel@...r.kernel.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Thomas Gleixner <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>, Borislav Petkov <bp@...en8.de>
Subject: Re: [PATCH] string: Improve the generic strlcpy() implementation


* Ingo Molnar <mingo@...nel.org> wrote:

> 
> * Alexey Dobriyan <adobriyan@...il.com> wrote:
> 
> > I want to say two things:
> > 
> > 1) strlcpy race
> > 
> > >  * In addition, the implementation is robust to the string changing out
> > >  * from underneath it, unlike the current strlcpy() implementation.
> > 
> > Canonical OpenBSD version does byte-by-byte copying,
> > this race is purely Linux invention.
> > 
> > 2) strscpy() will copy garbage past NUL from source into destination.
> > It won't fault but still, who knows what lies after string.
> 
> So I think your argument is nonsense on several levels:

Oh, you are right strscpy() - I mis-read your mail.

So the argument that is nonsensical here is mine!

Thanks,

	Ingo
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