linux-kernel - Re: [PATCH v4 01/29] bluetooth: Switch SMP to crypto_cipher_encrypt

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Message-Id: <2833CC26-7306-4803-A5DB-4CBECCF35C08@holtmann.org>
Date:	Tue, 28 Jun 2016 00:30:24 +0200
From:	Marcel Holtmann <marcel@...tmann.org>
To:	Ingo Molnar <mingo@...nel.org>
Cc:	Andy Lutomirski <luto@...nel.org>, x86@...nel.org,
	LKML <linux-kernel@...r.kernel.org>, linux-arch@...r.kernel.org,
	Borislav Petkov <bp@...en8.de>,
	Nadav Amit <nadav.amit@...il.com>,
	Kees Cook <keescook@...omium.org>,
	Brian Gerst <brgerst@...il.com>,
	"kernel-hardening@...ts.openwall.com" 
	<kernel-hardening@...ts.openwall.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Josh Poimboeuf <jpoimboe@...hat.com>,
	Jann Horn <jann@...jh.net>,
	Heiko Carstens <heiko.carstens@...ibm.com>,
	"Gustavo F. Padovan" <gustavo@...ovan.org>,
	Johan Hedberg <johan.hedberg@...il.com>,
	"David S. Miller" <davem@...emloft.net>,
	linux-bluetooth@...r.kernel.org, netdev@...r.kernel.org
Subject: Re: [PATCH v4 01/29] bluetooth: Switch SMP to crypto_cipher_encrypt_one()

Hi Ingo,

>>> SMP does ECB crypto on stack buffers.  This is complicated and
>>> fragile, and it will not work if the stack is virtually allocated.
>>> 
>>> Switch to the crypto_cipher interface, which is simpler and safer.
>>> 
>>> Cc: Marcel Holtmann <marcel@...tmann.org>
>>> Cc: Gustavo Padovan <gustavo@...ovan.org>
>>> Cc: Johan Hedberg <johan.hedberg@...il.com>
>>> Cc: "David S. Miller" <davem@...emloft.net>
>>> Cc: linux-bluetooth@...r.kernel.org
>>> Cc: netdev@...r.kernel.org
>>> Acked-by: Herbert Xu <herbert@...dor.apana.org.au>
>>> Acked-and-tested-by: Johan Hedberg <johan.hedberg@...el.com>
>>> Signed-off-by: Andy Lutomirski <luto@...nel.org>
>>> ---
>>> net/bluetooth/smp.c | 67 ++++++++++++++++++++++-------------------------------
>>> 1 file changed, 28 insertions(+), 39 deletions(-)
>> 
>> patch has been applied to bluetooth-next tree.
> 
> Sadly carrying this separately will delay the virtual kernel stacks feature by a 
> kernel cycle, because it's a must-have prerequisite.

I can take it back out, but then I have the fear the the ECDH change to use KPP for SMP might be the one that has to wait a kernel cycle. Either way is fine with me, but I want to avoid nasty merge conflicts in the Bluetooth SMP code.

Regards

Marcel