From: Andries Brouwer <aebr-ek1Qb6IBo2Pz+pZb47iToQ@public.gmane.org>
To: Petr Vandrovec <vandrove-hnqZr3NxcozrBKCeMvbIDA@public.gmane.org>
Cc: John Belmonte <jvb-ZFKsivP1bGvOQU1ULcgDhA@public.gmane.org>,
Ben Collins <bcollins-8fiUuRrzOP0dnm+yROfE0A@public.gmane.org>,
Linus Torvalds <torvalds-3NddpPZAyC0@public.gmane.org>,
linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
acpi-devel-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org,
Michael Wawrzyniak <gan-28sE0Wxkf/LCXR85Y8Hu3Q@public.gmane.org>
Subject: Re: [PATCH] bad strlcpy conversion breaks toshiba_acpi
Date: Fri, 25 Jul 2003 18:57:09 +0200 [thread overview]
Message-ID: <20030725165709.GA670@win.tue.nl> (raw)
In-Reply-To: <20030725161510.GA31565-Kr4v8scruuLwY2GEPTd/bA@public.gmane.org>
On Fri, Jul 25, 2003 at 06:15:10PM +0200, Petr Vandrovec wrote:
> Nope. Kernel strlcpy implementation is crap and I do not believe that there
> is single place in the kernel which can live with current implementation.
>
> Take a look at ftp://ftp.openbsd.org/pub/OpenBSD/src/lib/libc/string/strlcpy.c
> or at http://www.courtesan.com/todd/papers/strlcpy.html - it copies
> at most size-1 characters. Nothing about characters beyond specified size
> in the article.
>
> Kernel should use strnlen() to get string length, if coding loop like
> OpenBSD does is unacceptable.
strlcpy is for strings, not for character arrays.
The *BSD version accesses the source past the size-1 characters that are copied:
while (*s++)
;
Thus, replacing strncpy (used to copy character arrays, possibly not 0-terminated)
by strlcpy is wrong.
next prev parent reply other threads:[~2003-07-25 16:57 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-07-25 14:46 [PATCH] bad strlcpy conversion breaks toshiba_acpi John Belmonte
[not found] ` <3F2142CE.4090608-ZFKsivP1bGvOQU1ULcgDhA@public.gmane.org>
2003-07-25 16:15 ` Petr Vandrovec
[not found] ` <20030725161510.GA31565-Kr4v8scruuLwY2GEPTd/bA@public.gmane.org>
2003-07-25 16:57 ` Andries Brouwer [this message]
[not found] ` <20030725165709.GA670-ek1Qb6IBo2Pz+pZb47iToQ@public.gmane.org>
2003-07-27 21:02 ` Matthew Wilcox
[not found] ` <20030727210203.GU1485-+pPCBgu9SkPzIGdyhVEDUDl5KyyQGfY2kSSpQ9I8OhVaa/9Udqfwiw@public.gmane.org>
2003-07-27 21:26 ` M. Warner Losh
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