linux-hardening - Re: [PATCH] dm: Annotate struct dm_bio_prison with __counted

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Message-ID: <6f1ff9ac-e0cb-68f0-fa2f-91780a3eedb7@embeddedor.com>
Date:   Fri, 15 Sep 2023 14:32:31 -0600
From:   "Gustavo A. R. Silva" <gustavo@...eddedor.com>
To:     Kees Cook <keescook@...omium.org>, Alasdair Kergon <agk@...hat.com>
Cc:     Mike Snitzer <snitzer@...nel.org>, dm-devel@...hat.com,
        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] dm: Annotate struct dm_bio_prison with __counted_by



On 9/15/23 14:04, 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 dm_bio_prison.
> 
> [1] https://github.com/kees/kernel-tools/blob/trunk/coccinelle/examples/counted_by.cocci
> 
> Cc: Alasdair Kergon <agk@...hat.com>
> Cc: Mike Snitzer <snitzer@...nel.org>
> Cc: dm-devel@...hat.com
> Signed-off-by: Kees Cook <keescook@...omium.org>

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

Thanks
-- 
Gustavo

> ---
>   drivers/md/dm-bio-prison-v1.c | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/md/dm-bio-prison-v1.c b/drivers/md/dm-bio-prison-v1.c
> index 92afdca760ae..9ab32abe5ed4 100644
> --- a/drivers/md/dm-bio-prison-v1.c
> +++ b/drivers/md/dm-bio-prison-v1.c
> @@ -26,7 +26,7 @@ struct prison_region {
>   struct dm_bio_prison {
>   	mempool_t cell_pool;
>   	unsigned int num_locks;
> -	struct prison_region regions[];
> +	struct prison_region regions[] __counted_by(num_locks);
>   };
>   
>   static struct kmem_cache *_cell_cache;