From: Herbert Xu <herbert@gondor.apana.org.au>
To: Ard Biesheuvel <ardb@kernel.org>
Cc: Dmitry Safonov <dima@arista.com>,
Linux Crypto Mailing List <linux-crypto@vger.kernel.org>,
linux-kernel@vger.kernel.org, David Ahern <dsahern@kernel.org>,
Eric Dumazet <edumazet@google.com>,
Paolo Abeni <pabeni@redhat.com>, Jakub Kicinski <kuba@kernel.org>,
"David S. Miller" <davem@davemloft.net>,
Andy Lutomirski <luto@amacapital.net>,
Bob Gilligan <gilligan@arista.com>,
Dan Carpenter <error27@gmail.com>,
David Laight <David.Laight@aculab.com>,
Dmitry Safonov <0x7f454c46@gmail.com>,
Eric Biggers <ebiggers@kernel.org>,
"Eric W. Biederman" <ebiederm@xmission.com>,
Francesco Ruggeri <fruggeri05@gmail.com>,
Hideaki YOSHIFUJI <yoshfuji@linux-ipv6.org>,
Ivan Delalande <colona@arista.com>,
Leonard Crestez <cdleonard@gmail.com>,
Salam Noureddine <noureddine@arista.com>,
netdev@vger.kernel.org
Subject: Re: [PATCH] crypto: shash - Allow cloning on algorithms with no init_tfm
Date: Fri, 19 May 2023 17:35:48 +0800 [thread overview]
Message-ID: <ZGdC9MDomBGRpccP@gondor.apana.org.au> (raw)
In-Reply-To: <CAMj1kXEkz1QvkXWc8dCGhU_MPf+1M3P2+rAiLciuixnKCmRESg@mail.gmail.com>
On Fri, May 19, 2023 at 11:31:30AM +0200, Ard Biesheuvel wrote:
>
> OK. So IIUC, cloning a keyless hash just shares the TFM and bumps the
> refcount, but here we must actually allocate a new TFM referring to
> the same algo, and this new TFM needs its key to be set before use, as
> it doesn't inherit it from the clonee, right? And this works in the
> same way as cloning an instance of the generic HMAC template, as this
> will just clone the inner shash too, and will also leave the key
> unset.
Yes that's pretty much it. Cloning a tfm is basically exactly
the same as allocating a tfm, except that instead of going through
the init_tfm code-path it executes clone_tfm instead (thus allowing
any internal data structures to either be shared or allocated with
GFP_ATOMIC).
The key will be unset just like a freshly allocated tfm.
> If so,
>
> Acked-by: Ard Biesheuvel <ardb@kernel.org>
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
next prev parent reply other threads:[~2023-05-19 9:38 UTC|newest]
Thread overview: 38+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-05-12 20:22 [PATCH v6 00/21] net/tcp: Add TCP-AO support Dmitry Safonov
2023-05-12 20:22 ` [PATCH v6 01/21] net/tcp: Prepare tcp_md5sig_pool for TCP-AO Dmitry Safonov
2023-05-12 23:23 ` kernel test robot
2023-05-15 4:48 ` Herbert Xu
2023-05-15 16:25 ` Dmitry Safonov
2023-05-16 10:15 ` Herbert Xu
2023-05-19 8:26 ` [PATCH 0/3] crypto: cmac - Add cloning support Herbert Xu
2023-05-19 8:28 ` [PATCH 1/3] crypto: cmac - Use modern init_tfm/exit_tfm Herbert Xu
2023-05-19 8:28 ` [PATCH 2/3] crypto: cipher - Add crypto_clone_cipher Herbert Xu
2023-05-19 13:15 ` Simon Horman
2023-05-19 8:28 ` [PATCH 3/3] crypto: cmac - Add support for cloning Herbert Xu
2023-05-19 8:54 ` Ard Biesheuvel
2023-05-19 9:04 ` [PATCH] crypto: shash - Allow cloning on algorithms with no init_tfm Herbert Xu
2023-05-19 9:31 ` Ard Biesheuvel
2023-05-19 9:35 ` Herbert Xu [this message]
2023-05-19 14:41 ` [PATCH 3/3] crypto: cmac - Add support for cloning Dmitry Safonov
2023-05-19 9:49 ` [PATCH 0/3] crypto: cmac - Add cloning support Ard Biesheuvel
2023-05-12 20:22 ` [PATCH v6 02/21] net/tcp: Add TCP-AO config and structures Dmitry Safonov
2023-05-12 20:22 ` [PATCH v6 03/21] net/tcp: Introduce TCP_AO setsockopt()s Dmitry Safonov
2023-05-12 20:22 ` [PATCH v6 04/21] net/tcp: Prevent TCP-MD5 with TCP-AO being set Dmitry Safonov
2023-05-12 20:22 ` [PATCH v6 05/21] net/tcp: Calculate TCP-AO traffic keys Dmitry Safonov
2023-05-12 20:22 ` [PATCH v6 06/21] net/tcp: Add TCP-AO sign to outgoing packets Dmitry Safonov
2023-05-12 20:22 ` [PATCH v6 07/21] net/tcp: Add tcp_parse_auth_options() Dmitry Safonov
2023-05-12 23:02 ` kernel test robot
2023-05-12 20:22 ` [PATCH v6 08/21] net/tcp: Add AO sign to RST packets Dmitry Safonov
2023-05-12 20:22 ` [PATCH v6 09/21] net/tcp: Add TCP-AO sign to twsk Dmitry Safonov
2023-05-12 20:23 ` [PATCH v6 10/21] net/tcp: Wire TCP-AO to request sockets Dmitry Safonov
2023-05-12 20:23 ` [PATCH v6 11/21] net/tcp: Sign SYN-ACK segments with TCP-AO Dmitry Safonov
2023-05-12 20:23 ` [PATCH v6 12/21] net/tcp: Verify inbound TCP-AO signed segments Dmitry Safonov
2023-05-12 20:23 ` [PATCH v6 13/21] net/tcp: Add TCP-AO segments counters Dmitry Safonov
2023-05-12 20:23 ` [PATCH v6 14/21] net/tcp: Add TCP-AO SNE support Dmitry Safonov
2023-05-12 20:23 ` [PATCH v6 15/21] net/tcp: Add tcp_hash_fail() ratelimited logs Dmitry Safonov
2023-05-12 20:23 ` [PATCH v6 16/21] net/tcp: Ignore specific ICMPs for TCP-AO connections Dmitry Safonov
2023-05-12 20:23 ` [PATCH v6 17/21] net/tcp: Add option for TCP-AO to (not) hash header Dmitry Safonov
2023-05-12 20:23 ` [PATCH v6 18/21] net/tcp: Add TCP-AO getsockopt()s Dmitry Safonov
2023-05-12 20:23 ` [PATCH v6 19/21] net/tcp: Allow asynchronous delete for TCP-AO keys (MKTs) Dmitry Safonov
2023-05-12 20:23 ` [PATCH v6 20/21] net/tcp: Add static_key for TCP-AO Dmitry Safonov
2023-05-12 20:23 ` [PATCH v6 21/21] net/tcp: Wire up l3index to TCP-AO Dmitry Safonov
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