Re: [PATCH] use %pK for /proc/kallsyms and /proc/modules

From: Andrew Morton
Date: Wed Jan 26 2011 - 19:47:40 EST

On Wed, 26 Jan 2011 16:29:36 -0800
Kees Cook <kees.cook@xxxxxxxxxxxxx> wrote:

> > > Note that this changes %x to %p, so some legitimately 0 values in
> > > /proc/kallsyms would have changed from 00000000 to "(null)". To avoid
> > > this, "(null)" is not used when using the "K" format. Anything parsing
> > > such addresses should have no problem with this change. (Thanks to Joe
> > > Perches for the suggestion.)
> >
> > OK, so what applications did this patch just break?
> I'm not aware of any breakage as a result of this yet.

There will be some - there always are :( But users will only see
problems if they've set kptr_restrict.

Which they shall do. How come we defaulted kptr_restrict to "true"?
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