linux-kernel - Re: [PATCH 1/2] crypto: use SM3 instead of SM3

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Date:   Mon, 18 Oct 2021 09:05:34 -0400
From:   James Bottomley <jejb@...ux.ibm.com>
To:     Tianjia Zhang <tianjia.zhang@...ux.alibaba.com>,
        Jarkko Sakkinen <jarkko@...nel.org>,
        Mimi Zohar <zohar@...ux.ibm.com>,
        Jonathan Corbet <corbet@....net>,
        Herbert Xu <herbert@...dor.apana.org.au>,
        "David S. Miller" <davem@...emloft.net>,
        Peter Huewe <peterhuewe@....de>,
        Jason Gunthorpe <jgg@...pe.ca>,
        David Howells <dhowells@...hat.com>,
        James Morris <jmorris@...ei.org>,
        "Serge E. Hallyn" <serge@...lyn.com>,
        Jerry Snitselaar <jsnitsel@...hat.com>,
        linux-integrity@...r.kernel.org, keyrings@...r.kernel.org,
        linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-crypto@...r.kernel.org, linux-security-module@...r.kernel.org
Subject: Re: [PATCH 1/2] crypto: use SM3 instead of SM3_256

On Sat, 2021-10-09 at 21:08 +0800, Tianjia Zhang wrote:
[...]
> diff --git a/include/uapi/linux/hash_info.h
> b/include/uapi/linux/hash_info.h
> index 74a8609fcb4d..1355525dd4aa 100644
> --- a/include/uapi/linux/hash_info.h
> +++ b/include/uapi/linux/hash_info.h
> @@ -32,7 +32,7 @@ enum hash_algo {
>  	HASH_ALGO_TGR_128,
>  	HASH_ALGO_TGR_160,
>  	HASH_ALGO_TGR_192,
> -	HASH_ALGO_SM3_256,
> +	HASH_ALGO_SM3,
>  	HASH_ALGO_STREEBOG_256,
>  	HASH_ALGO_STREEBOG_512,
>  	HASH_ALGO__LAST

This is another one you can't do: all headers in UAPI are exports to
userspace and the definitions constitute an ABI.  If you simply do a
rename, every userspace program that uses the current definition will
immediately break on compile.  You could add HASH_ALGO_SM3, but you
can't remove HASH_ALGO_SM3_256

James