linux-hardening - Re: [PATCH] scsi: target: tcmu: Annotate struct tcmu_tmr with __counted

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Date: Sun, 24 Sep 2023 19:06:25 +0200
From: Bodo Stroesser <bostroesser@...il.com>
To: Kees Cook <keescook@...omium.org>
Cc: "Martin K. Petersen" <martin.petersen@...cle.com>,
 linux-scsi@...r.kernel.org, target-devel@...r.kernel.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] scsi: target: tcmu: Annotate struct tcmu_tmr with
 __counted_by

On 22.09.23 19:53, 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 tcmu_tmr.
> 
> [1] https://github.com/kees/kernel-tools/blob/trunk/coccinelle/examples/counted_by.cocci
> 
> Cc: Bodo Stroesser <bostroesser@...il.com>
> Cc: "Martin K. Petersen" <martin.petersen@...cle.com>
> Cc: linux-scsi@...r.kernel.org
> Cc: target-devel@...r.kernel.org
> Signed-off-by: Kees Cook <keescook@...omium.org>
> ---
>   drivers/target/target_core_user.c | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/target/target_core_user.c b/drivers/target/target_core_user.c
> index 22cc6cac0ba2..7eb94894bd68 100644
> --- a/drivers/target/target_core_user.c
> +++ b/drivers/target/target_core_user.c
> @@ -201,7 +201,7 @@ struct tcmu_tmr {
>   
>   	uint8_t tmr_type;
>   	uint32_t tmr_cmd_cnt;
> -	int16_t tmr_cmd_ids[];
> +	int16_t tmr_cmd_ids[] __counted_by(tmr_cmd_cnt);
>   };
>   
>   /*

Reviewed-by: Bodo Stroesser <bostroesser@...il.com>

Thank you,
Bodo