linux-kernel - Re: [PATCH] i3c: master: cdns: Annotate struct cdns_i3c_xfer with __counted

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Message-ID: <a93452ff-6611-d14d-37b1-09afbf0d7348@embeddedor.com>
Date:   Sat, 23 Sep 2023 10:28:40 -0600
From:   "Gustavo A. R. Silva" <gustavo@...eddedor.com>
To:     Kees Cook <keescook@...omium.org>,
        Przemysław Gaj <pgaj@...ence.com>
Cc:     Alexandre Belloni <alexandre.belloni@...tlin.com>,
        linux-i3c@...ts.infradead.org,
        Nathan Chancellor <nathan@...nel.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Tom Rix <trix@...hat.com>, linux-kernel@...r.kernel.org,
        llvm@...ts.linux.dev, linux-hardening@...r.kernel.org
Subject: Re: [PATCH] i3c: master: cdns: Annotate struct cdns_i3c_xfer with
 __counted_by



On 9/22/23 11:50, 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 cdns_i3c_xfer.
> 
> [1] https://github.com/kees/kernel-tools/blob/trunk/coccinelle/examples/counted_by.cocci
> 
> Cc: "Przemysław Gaj" <pgaj@...ence.com>
> Cc: Alexandre Belloni <alexandre.belloni@...tlin.com>
> Cc: linux-i3c@...ts.infradead.org
> Signed-off-by: Kees Cook <keescook@...omium.org>

Reviewed-by: Gustavo A. R. Silva <gustavoars@...nel.org>

Thanks
-- 
Gustavo

> ---
>   drivers/i3c/master/i3c-master-cdns.c | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/i3c/master/i3c-master-cdns.c b/drivers/i3c/master/i3c-master-cdns.c
> index 49551db71bc9..97c1010956a0 100644
> --- a/drivers/i3c/master/i3c-master-cdns.c
> +++ b/drivers/i3c/master/i3c-master-cdns.c
> @@ -387,7 +387,7 @@ struct cdns_i3c_xfer {
>   	struct completion comp;
>   	int ret;
>   	unsigned int ncmds;
> -	struct cdns_i3c_cmd cmds[];
> +	struct cdns_i3c_cmd cmds[] __counted_by(ncmds);
>   };
>   
>   struct cdns_i3c_data {