Re: [patch 03/26] sysfs: zero terminate sysfs write buffers (CVE-2006-1055)

[Al Viro]

On Wed, Apr 05, 2006 at 12:34:49PM -0400, Jon Smirl wrote:
> On 4/5/06, Al Viro <viro@xxxxxxxxxxxxxxxx> wrote:
> > On Wed, Apr 05, 2006 at 07:09:28PM +0400, Sergey Vlasov wrote:
> > > This will break the "color_map" sysfs file for framebuffers -
> > > drivers/video/fbsysfs.c:store_cmap() expects to get exactly 4096 bytes
> > > for a colormap with 256 entries.  In fact, the original patch which
> > > changed PAGE_SIZE - 1 to PAGE_SIZE:
> >
> > ... cheerfully assuming that nobody assumes NUL-termination and
> > everyone (sysfs patch writers!) certainly uses the length argument.
> > Fscking brilliant, that.
> 
> Why does sysfs have two string length determination methods - both
> NULL termination and a length parameter. It should be one or the
> other, not both. Having both simply cause problems when some
> developers implement one scheme and others only implement the other.

Which part of "sysfs patches can be written by idiots and usually are"
is too hard to understand?  Oh, wait.  I see...  Well, nevermind, then...
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