linux-kernel - Re: [PATCH] nvmet-fc: Annotate struct nvmet_fc_tgt_queue with __counted

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Date:   Wed, 4 Oct 2023 01:41:49 +0200
From:   "Gustavo A. R. Silva" <gustavo@...eddedor.com>
To:     Kees Cook <keescook@...omium.org>,
        James Smart <james.smart@...adcom.com>
Cc:     Christoph Hellwig <hch@....de>, Sagi Grimberg <sagi@...mberg.me>,
        Chaitanya Kulkarni <kch@...dia.com>,
        linux-nvme@...ts.infradead.org,
        "Gustavo A. R. Silva" <gustavoars@...nel.org>,
        Nathan Chancellor <nathan@...nel.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Tom Rix <trix@...hat.com>, linux-kernel@...r.kernel.org,
        linux-hardening@...r.kernel.org, llvm@...ts.linux.dev
Subject: Re: [PATCH] nvmet-fc: Annotate struct nvmet_fc_tgt_queue with
 __counted_by



On 10/4/23 01:25, 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 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 nvmet_fc_tgt_queue.
> 
> Cc: James Smart <james.smart@...adcom.com>
> Cc: Christoph Hellwig <hch@....de>
> Cc: Sagi Grimberg <sagi@...mberg.me>
> Cc: Chaitanya Kulkarni <kch@...dia.com>
> Cc: linux-nvme@...ts.infradead.org
> Link: https://github.com/kees/kernel-tools/blob/trunk/coccinelle/examples/counted_by.cocci [1]
> Signed-off-by: Kees Cook <keescook@...omium.org>

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

Thanks
--
Gustavo

> ---
>   drivers/nvme/target/fc.c | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/nvme/target/fc.c b/drivers/nvme/target/fc.c
> index 1ab6601fdd5c..0fa2d658cdeb 100644
> --- a/drivers/nvme/target/fc.c
> +++ b/drivers/nvme/target/fc.c
> @@ -146,7 +146,7 @@ struct nvmet_fc_tgt_queue {
>   	struct workqueue_struct		*work_q;
>   	struct kref			ref;
>   	struct rcu_head			rcu;
> -	struct nvmet_fc_fcp_iod		fod[];		/* array of fcp_iods */
> +	struct nvmet_fc_fcp_iod		fod[] __counted_by(sqsize); /* array of fcp_iods */
>   } __aligned(sizeof(unsigned long long));
>   
>   struct nvmet_fc_hostport {