linux-hardening - Re: [PATCH v4 3/8] dt-bindings: clock: Add Marvell PXA1908 clock bindings

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Date:   Tue, 8 Aug 2023 11:46:23 +0100
From:   Conor Dooley <conor@...nel.org>
To:     Duje Mihanović <duje.mihanovic@...le.hr>
Cc:     Conor Dooley <conor+dt@...nel.org>,
        Lubomir Rintel <lkundrak@...sk>,
        Robert Jarzmik <robert.jarzmik@...e.fr>,
        Linus Walleij <linus.walleij@...aro.org>,
        Bartosz Golaszewski <brgl@...ev.pl>,
        Andy Shevchenko <andy@...nel.org>,
        Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>,
        Kees Cook <keescook@...omium.org>,
        Tony Luck <tony.luck@...el.com>,
        "Guilherme G. Piccoli" <gpiccoli@...lia.com>,
        linux-gpio@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-clk@...r.kernel.org, devicetree@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-hardening@...r.kernel.org,
        ~postmarketos/upstreaming@...ts.sr.ht, phone-devel@...r.kernel.org,
        afaerber@...e.de
Subject: Re: [PATCH v4 3/8] dt-bindings: clock: Add Marvell PXA1908 clock
 bindings

On Tue, Aug 08, 2023 at 12:41:22PM +0200, Duje Mihanović wrote:
> On Tuesday, August 8, 2023 9:49:49 AM CEST Conor Dooley wrote:
> > On Mon, Aug 07, 2023 at 05:42:37PM +0200, Duje Mihanović wrote:
> > > diff --git a/include/dt-bindings/clock/marvell,pxa1908.h
> > > b/include/dt-bindings/clock/marvell,pxa1908.h new file mode 100644
> > > index 000000000000..0c1f328bf534
> > > --- /dev/null
> > > +++ b/include/dt-bindings/clock/marvell,pxa1908.h
> > > +#define PXA1908_CLK_PLL4VCODIV3		38
> > > +#define PXA1908_MPMU_NR_CLKS		38
> > > 
> > > +#define PXA1908_CLK_TWSI3		18
> > > +#define PXA1908_APBC_NR_CLKS		50
> > > 
> > > +#define PXA1908_CLK_AICER		3
> > > +#define PXA1908_APBCP_NR_CLKS		50
> > > 
> > > +#define PXA1908_CLK_DVC_DFC_DEBUG	16
> > > +#define PXA1908_APMU_NR_CLKS		50
> > 
> > How are these "NR_CLKS" things helpful to the binding?
> 
> They are used by the clock driver when calling mmp_clk_init which then uses 
> that as the size of a struct clk array it allocates. In retrospect, 50 for 
> each block may be too much as from what I can tell by reading the 
> mmp_register_* functions (number of clocks + 1) for each block should be 
> enough, anything less than that causes a null pointer dereference sometime 
> during clock initialization.

I think you might have misread my question, I'm not really interested in
the implementation detail of the driver. If these are not used in
devicetree, remove them - otherwise they are being needlessly added to
the ABI.

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