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

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Date:   Tue, 8 Aug 2023 12:23:23 +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 01:03:33PM +0200, Duje Mihanović wrote:
> On Tuesday, August 8, 2023 12:46:23 PM CEST Conor Dooley wrote:
> > On Tue, Aug 08, 2023 at 12:41:22PM +0200, Duje Mihanović wrote:
> > > 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.
> 
> Should I also do this in the rest of the MMP clock drivers?

Krzysztof has just done it for all of the Samsung ones! I think it
wouldn't be a bad idea to get rid of them else where & new additions
should definitely be avoided.

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