linux-kernel - Re: [PATCH 1/2] crypto: export crypto_alg

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Message-ID: <20150813063823.GA20830@gondor.apana.org.au>
Date:	Thu, 13 Aug 2015 14:38:23 +0800
From:	Herbert Xu <herbert@...dor.apana.org.au>
To:	Joonsoo Kim <iamjoonsoo.kim@....com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Minchan Kim <minchan@...nel.org>,
	Nitin Gupta <ngupta@...are.org>,
	Sergey Senozhatsky <sergey.senozhatsky.work@...il.com>,
	linux-kernel@...r.kernel.org, linux-crypto@...r.kernel.org,
	"David S. Miller" <davem@...emloft.net>,
	Stephan Mueller <smueller@...onox.de>
Subject: Re: [PATCH 1/2] crypto: export crypto_alg_list and rwsem

On Thu, Aug 13, 2015 at 03:37:55PM +0900, Joonsoo Kim wrote:
>
> Is there any way to access netlink interface and get the output from
> kernel-side? I'd like to show information through
> "/sys/block/zramX/comp_algorithm", because some user program can be
> broken if we change output of userspace exposed interface.

You could simply deprecate that interface but keep it for existing
algorithms.  Any new algorithms can then be queried through the
crypto_user interface.

The other option is to have a defined list of algorithms which is
independent of the crypto API.  For example, have a look at what
IPsec does in net/xfrm/xfrm_algo.c.  IPsec needs its own list
because they come with annotations.

Cheers,
-- 
Email: Herbert Xu <herbert@...dor.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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