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Message-ID: <ZQ8Y0btrpGuESo4F@work>
Date: Sat, 23 Sep 2023 10:56:49 -0600
From: "Gustavo A. R. Silva" <gustavoars@...nel.org>
To: Kees Cook <keescook@...omium.org>
Cc: Wolfram Sang <wsa@...nel.org>,
Tomi Valkeinen <tomi.valkeinen@...asonboard.com>,
Luca Ceresoli <luca.ceresoli@...tlin.com>,
Nathan Chancellor <nathan@...nel.org>,
Nick Desaulniers <ndesaulniers@...gle.com>,
Tom Rix <trix@...hat.com>, linux-i2c@...r.kernel.org,
llvm@...ts.linux.dev, linux-kernel@...r.kernel.org,
linux-hardening@...r.kernel.org
Subject: Re: [PATCH] media: i2c: Annotate struct i2c_atr with __counted_by
On Fri, Sep 22, 2023 at 10:54:25AM -0700, Kees Cook wrote:
> Prepare for the coming implementation by GCC and Clang of the __counted_by
> attribute. Flexible array members annotated with __counted_by can have
> their accesses bounds-checked at run-time checking via CONFIG_UBSAN_BOUNDS
> (for array indexing) and CONFIG_FORTIFY_SOURCE (for strcpy/memcpy-family
> functions).
>
> As found with Coccinelle[1], add __counted_by for struct i2c_atr.
>
> [1] https://github.com/kees/kernel-tools/blob/trunk/coccinelle/examples/counted_by.cocci
>
> Cc: Wolfram Sang <wsa@...nel.org>
> Cc: Tomi Valkeinen <tomi.valkeinen@...asonboard.com>
> Cc: Luca Ceresoli <luca.ceresoli@...tlin.com>
> Cc: Nathan Chancellor <nathan@...nel.org>
> Cc: Nick Desaulniers <ndesaulniers@...gle.com>
> Cc: Tom Rix <trix@...hat.com>
> Cc: linux-i2c@...r.kernel.org
> Cc: llvm@...ts.linux.dev
> Signed-off-by: Kees Cook <keescook@...omium.org>
Reviewed-by: Gustavo A. R. Silva <gustavoars@...nel.org>
Thanks
--
Gustavo
> ---
> drivers/i2c/i2c-atr.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/i2c/i2c-atr.c b/drivers/i2c/i2c-atr.c
> index 8ca1daadec93..f21475ae5921 100644
> --- a/drivers/i2c/i2c-atr.c
> +++ b/drivers/i2c/i2c-atr.c
> @@ -94,7 +94,7 @@ struct i2c_atr {
>
> struct notifier_block i2c_nb;
>
> - struct i2c_adapter *adapter[];
> + struct i2c_adapter *adapter[] __counted_by(max_adapters);
> };
>
> static struct i2c_atr_alias_pair *
> --
> 2.34.1
>
>
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