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From: Kees Cook <keescook@chromium.org>
To: Nathan Chancellor <nathan@kernel.org>
Cc: William Breathitt Gray <william.gray@linaro.org>,
	linux-iio@vger.kernel.org,
	Nick Desaulniers <ndesaulniers@google.com>,
	Tom Rix <trix@redhat.com>,
	Sami Tolvanen <samitolvanen@google.com>,
	llvm@lists.linux.dev, linux-kernel@vger.kernel.org,
	patches@lists.linux.dev,
	Patrick Havelange <patrick.havelange@essensium.com>,
	Jarkko Nikula <jarkko.nikula@linux.intel.com>,
	Oleksij Rempel <linux@rempel-privat.de>,
	Pengutronix Kernel Team <kernel@pengutronix.de>,
	Fabrice Gasnier <fabrice.gasnier@foss.st.com>,
	Vignesh Raghavendra <vigneshr@ti.com>,
	Julien Panis <jpanis@baylibre.com>,
	David Lechner <david@lechnology.com>,
	linux-arm-kernel@lists.infradead.org,
	linux-stm32@st-md-mailman.stormreply.com,
	linux-omap@vger.kernel.org
Subject: Re: [PATCH 1/4] counter: Adjust final parameter type in function and signal callbacks
Date: Wed, 2 Nov 2022 15:02:44 -0700	[thread overview]
Message-ID: <202211021501.88D8147@keescook> (raw)
In-Reply-To: <Y2LR13xrrauVmeXP@dev-arch.thelio-3990X>

On Wed, Nov 02, 2022 at 01:23:51PM -0700, Nathan Chancellor wrote:
> Right, I am not the biggest fan of this change myself and it is entirely
> possible that I am misreading the warnings from the commit message but I
> do not see how
> 
>         comp_node.comp.signal_u32_read = counter->ops->signal_read;
> 
> and
> 
>         comp_node.comp.count_u32_read = counter->ops->function_read;
> 
> in counter_add_watch(),
> 
>         comp.signal_u32_read = counter->ops->signal_read;
> 
> in counter_signal_attrs_create(), and
> 
>         comp.count_u32_read = counter->ops->function_read;
>         comp.count_u32_write = counter->ops->function_write;
> 
> in counter_count_attrs_create() are currently safe under kCFI, since the
> final parameter type of the prototypes in 'struct counter_ops' does not
> match the final parameter type of the prototypes in 'struct
> counter_comp'. I would expect the indirect calls in counter_get_data()
> and counter_comp_u32_show() to fail currently.

Ah! Thank you -- those were the places I couldn't find.

-- 
Kees Cook

WARNING: multiple messages have this Message-ID (diff)
From: Kees Cook <keescook@chromium.org>
To: Nathan Chancellor <nathan@kernel.org>
Cc: William Breathitt Gray <william.gray@linaro.org>,
	linux-iio@vger.kernel.org,
	Nick Desaulniers <ndesaulniers@google.com>,
	Tom Rix <trix@redhat.com>,
	Sami Tolvanen <samitolvanen@google.com>,
	llvm@lists.linux.dev, linux-kernel@vger.kernel.org,
	patches@lists.linux.dev,
	Patrick Havelange <patrick.havelange@essensium.com>,
	Jarkko Nikula <jarkko.nikula@linux.intel.com>,
	Oleksij Rempel <linux@rempel-privat.de>,
	Pengutronix Kernel Team <kernel@pengutronix.de>,
	Fabrice Gasnier <fabrice.gasnier@foss.st.com>,
	Vignesh Raghavendra <vigneshr@ti.com>,
	Julien Panis <jpanis@baylibre.com>,
	David Lechner <david@lechnology.com>,
	linux-arm-kernel@lists.infradead.org,
	linux-stm32@st-md-mailman.stormreply.com,
	linux-omap@vger.kernel.org
Subject: Re: [PATCH 1/4] counter: Adjust final parameter type in function and signal callbacks
Date: Wed, 2 Nov 2022 15:02:44 -0700	[thread overview]
Message-ID: <202211021501.88D8147@keescook> (raw)
In-Reply-To: <Y2LR13xrrauVmeXP@dev-arch.thelio-3990X>

On Wed, Nov 02, 2022 at 01:23:51PM -0700, Nathan Chancellor wrote:
> Right, I am not the biggest fan of this change myself and it is entirely
> possible that I am misreading the warnings from the commit message but I
> do not see how
> 
>         comp_node.comp.signal_u32_read = counter->ops->signal_read;
> 
> and
> 
>         comp_node.comp.count_u32_read = counter->ops->function_read;
> 
> in counter_add_watch(),
> 
>         comp.signal_u32_read = counter->ops->signal_read;
> 
> in counter_signal_attrs_create(), and
> 
>         comp.count_u32_read = counter->ops->function_read;
>         comp.count_u32_write = counter->ops->function_write;
> 
> in counter_count_attrs_create() are currently safe under kCFI, since the
> final parameter type of the prototypes in 'struct counter_ops' does not
> match the final parameter type of the prototypes in 'struct
> counter_comp'. I would expect the indirect calls in counter_get_data()
> and counter_comp_u32_show() to fail currently.

Ah! Thank you -- those were the places I couldn't find.

-- 
Kees Cook

_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel

  parent reply	other threads:[~2022-11-02 22:02 UTC|newest]

Thread overview: 18+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-11-02 17:22 [PATCH 1/4] counter: Adjust final parameter type in function and signal callbacks Nathan Chancellor
2022-11-02 17:22 ` Nathan Chancellor
2022-11-02 17:22 ` [PATCH 2/4] counter: stm32-timer-cnt: Adjust final parameter type of stm32_count_direction_read() Nathan Chancellor
2022-11-02 17:22   ` Nathan Chancellor
2022-11-02 17:22 ` [PATCH 3/4] counter: ti-ecap-capture: Adjust final parameter type of ecap_cnt_pol_{read,write}() Nathan Chancellor
2022-11-02 17:22 ` [PATCH 4/4] counter: 104-quad-8: Adjust final parameter type of certain callback functions Nathan Chancellor
2022-11-02 19:21 ` [PATCH 1/4] counter: Adjust final parameter type in function and signal callbacks Kees Cook
2022-11-02 19:21   ` Kees Cook
2022-11-02 20:23   ` Nathan Chancellor
2022-11-02 20:23     ` Nathan Chancellor
2022-11-02 21:30     ` William Breathitt Gray
2022-11-02 21:30       ` William Breathitt Gray
2022-11-02 22:02     ` Kees Cook [this message]
2022-11-02 22:02       ` Kees Cook
2022-11-02 23:22     ` Kees Cook
2022-11-02 23:22       ` Kees Cook
2022-11-03  3:38       ` William Breathitt Gray
2022-11-03  3:38         ` William Breathitt Gray

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