linux-kernel - Re: [PATCH 4/7] mm: Introduce verify_page

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Message-ID: <YHVADhpkETMQGD5X@hirez.programming.kicks-ass.net>
Date:   Tue, 13 Apr 2021 08:54:06 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Kees Cook <keescook@...omium.org>
Cc:     akpm@...ux-foundation.org, linux-kernel@...r.kernel.org,
        boris.ostrovsky@...cle.com, jgross@...e.com,
        sstabellini@...nel.org, x86@...nel.org,
        jani.nikula@...ux.intel.com, joonas.lahtinen@...ux.intel.com,
        rodrigo.vivi@...el.com, chris@...is-wilson.co.uk,
        intel-gfx@...ts.freedesktop.org, linux-mm@...ck.org, hch@....de
Subject: Re: [PATCH 4/7] mm: Introduce verify_page_range()

On Mon, Apr 12, 2021 at 01:05:09PM -0700, Kees Cook wrote:
> On Mon, Apr 12, 2021 at 10:00:16AM +0200, Peter Zijlstra wrote:
> > +struct vpr_data {
> > +	int (*fn)(pte_t pte, unsigned long addr, void *data);
> > +	void *data;
> > +};
> 
> Eeerg. This is likely to become an attack target itself. Stored function
> pointer with stored (3rd) argument.

You got some further reading on that? How exactly are those exploited?