[PATCH][next] crypto: aspeed - Replace zero-length array with flexible-array member

[PATCH][next] crypto: aspeed - Replace zero-length array with flexible-array member

[Gustavo A. R. Silva]

Zero-length arrays are deprecated[1] and we are moving towards
adopting C99 flexible-array members instead. So, replace zero-length
array declaration in struct aspeed_sham_ctx with flex-array
member.

This helps with the ongoing efforts to tighten the FORTIFY_SOURCE
routines on memcpy() and help us make progress towards globally
enabling -fstrict-flex-arrays=3 [2].

Link: https://www.kernel.org/doc/html/latest/process/deprecated.html#zero-length-and-one-element-arrays [1]
Link: https://gcc.gnu.org/pipermail/gcc-patches/2022-October/602902.html [2]
Link: https://github.com/KSPP/linux/issues/78
Signed-off-by: Gustavo A. R. Silva <gustavoars@kernel.org>
---
 drivers/crypto/aspeed/aspeed-hace.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/crypto/aspeed/aspeed-hace.h b/drivers/crypto/aspeed/aspeed-hace.h
index f2cde23b56ae..05d0a15d546d 100644
--- a/drivers/crypto/aspeed/aspeed-hace.h
+++ b/drivers/crypto/aspeed/aspeed-hace.h
@@ -183,7 +183,7 @@ struct aspeed_sham_ctx {
 	struct aspeed_hace_dev		*hace_dev;
 	unsigned long			flags;	/* hmac flag */
 
-	struct aspeed_sha_hmac_ctx	base[0];
+	struct aspeed_sha_hmac_ctx	base[];
 };
 
 struct aspeed_sham_reqctx {
-- 
2.34.1


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RE: [PATCH][next] crypto: aspeed - Replace zero-length array with flexible-array member

[Neal Liu]

> Zero-length arrays are deprecated[1] and we are moving towards adopting
> C99 flexible-array members instead. So, replace zero-length array declaration
> in struct aspeed_sham_ctx with flex-array member.
> 
> This helps with the ongoing efforts to tighten the FORTIFY_SOURCE routines
> on memcpy() and help us make progress towards globally enabling
> -fstrict-flex-arrays=3 [2].
> 
> Link:
> https://www.kernel.org/doc/html/latest/process/deprecated.html#zero-lengt
> h-and-one-element-arrays [1]
> Link: https://gcc.gnu.org/pipermail/gcc-patches/2022-October/602902.html
> [2]
> Link: https://github.com/KSPP/linux/issues/78
> Signed-off-by: Gustavo A. R. Silva <gustavoars@kernel.org>
> ---
>  drivers/crypto/aspeed/aspeed-hace.h | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/crypto/aspeed/aspeed-hace.h
> b/drivers/crypto/aspeed/aspeed-hace.h
> index f2cde23b56ae..05d0a15d546d 100644
> --- a/drivers/crypto/aspeed/aspeed-hace.h
> +++ b/drivers/crypto/aspeed/aspeed-hace.h
> @@ -183,7 +183,7 @@ struct aspeed_sham_ctx {
>  	struct aspeed_hace_dev		*hace_dev;
>  	unsigned long			flags;	/* hmac flag */
> 
> -	struct aspeed_sha_hmac_ctx	base[0];
> +	struct aspeed_sha_hmac_ctx	base[];
>  };
> 
>  struct aspeed_sham_reqctx {
> --
> 2.34.1

Reviewed-by: Neal Liu <neal_liu@aspeedtech.com>


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Re: [PATCH][next] crypto: aspeed - Replace zero-length array with flexible-array member

[Kees Cook]

On Mon, Jan 09, 2023 at 07:39:17PM -0600, Gustavo A. R. Silva wrote:
> Zero-length arrays are deprecated[1] and we are moving towards
> adopting C99 flexible-array members instead. So, replace zero-length
> array declaration in struct aspeed_sham_ctx with flex-array
> member.
> 
> This helps with the ongoing efforts to tighten the FORTIFY_SOURCE
> routines on memcpy() and help us make progress towards globally
> enabling -fstrict-flex-arrays=3 [2].
> 
> Link: https://www.kernel.org/doc/html/latest/process/deprecated.html#zero-length-and-one-element-arrays [1]
> Link: https://gcc.gnu.org/pipermail/gcc-patches/2022-October/602902.html [2]
> Link: https://github.com/KSPP/linux/issues/78
> Signed-off-by: Gustavo A. R. Silva <gustavoars@kernel.org>

Reviewed-by: Kees Cook <keescook@chromium.org>

-- 
Kees Cook

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Re: [PATCH][next] crypto: aspeed - Replace zero-length array with flexible-array member

[Herbert Xu]

On Mon, Jan 09, 2023 at 07:39:17PM -0600, Gustavo A. R. Silva wrote:
> Zero-length arrays are deprecated[1] and we are moving towards
> adopting C99 flexible-array members instead. So, replace zero-length
> array declaration in struct aspeed_sham_ctx with flex-array
> member.
> 
> This helps with the ongoing efforts to tighten the FORTIFY_SOURCE
> routines on memcpy() and help us make progress towards globally
> enabling -fstrict-flex-arrays=3 [2].
> 
> Link: https://www.kernel.org/doc/html/latest/process/deprecated.html#zero-length-and-one-element-arrays [1]
> Link: https://gcc.gnu.org/pipermail/gcc-patches/2022-October/602902.html [2]
> Link: https://github.com/KSPP/linux/issues/78
> Signed-off-by: Gustavo A. R. Silva <gustavoars@kernel.org>
> ---
>  drivers/crypto/aspeed/aspeed-hace.h | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)

Patch applied.  Thanks.
-- 
Email: Herbert Xu <herbert@gondor.apana.org.au>
Home Page: http://gondor.apana.org.au/~herbert/
PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt

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