Re: [PATCH v4 11/14] treewide: Prepare to remove VLA usage for AHASH_REQUEST_ON_STACK

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On Thu, Jul 19, 2018 at 7:54 AM, Ard Biesheuvel
<ard.biesheuvel@xxxxxxxxxx> wrote:
> On 19 July 2018 at 12:13, Ard Biesheuvel <ard.biesheuvel@xxxxxxxxxx> wrote:
>>
>>> On 19 Jul 2018, at 12:09, Kees Cook <keescook@xxxxxxxxxxxx> wrote:
>>>
>>> On Wed, Jul 18, 2018 at 7:55 PM, Ard Biesheuvel
>>> <ard.biesheuvel@xxxxxxxxxx> wrote:
>>>> I have only build tested it, so if you make sure that it does not break anything, please go ahead.
>>>
>>> I can give it a spin; what's the best way? Is CONFIG_CRYPTO_MANAGER=y
>>> sufficient?
>>>
>>
>> You should be able to test ccm(aes) with tcrypt, yes
>
> Apologies, I should have been more clear here. I was replying on my
> phone while attending a meeting.
>
> The builtin test will only kick in for chaining mode templates if they
> are instantiated by something that invokes the algorithm, such as
> loading tcrypt.ko with mode=37 (assuming that ccm(aes) has to be
> instantiated from crypto/ccm.c and some AES cipher rather than being
> provided directly by, e.g., arm64's AES-CCM driver)
>
> I just did the tcrypt myself, and the patch appears to be fine. Let me
> know if you want me to spin the patch.

Awesome, thanks for testing! I built a commit with you as the author.
I'll send it out with the next batch... :)

-Kees

-- 
Kees Cook
Pixel Security



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