netdev - Re: [REGRESSION] Re: [PATCH] crypto: pkcs7: remove sha1 support

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Date: Wed, 13 Mar 2024 13:12:54 -0700
From: James Prestwood <prestwoj@...il.com>
To: Eric Biggers <ebiggers@...nel.org>
Cc: Johannes Berg <johannes@...solutions.net>, Karel Balej
 <balejk@...fyz.cz>, dimitri.ledkov@...onical.com,
 alexandre.torgue@...s.st.com, davem@...emloft.net, dhowells@...hat.com,
 herbert@...dor.apana.org.au, keyrings@...r.kernel.org,
 linux-arm-kernel@...ts.infradead.org, linux-crypto@...r.kernel.org,
 linux-kernel@...r.kernel.org, linux-modules@...r.kernel.org,
 linux-stm32@...md-mailman.stormreply.com, mcgrof@...nel.org,
 mcoquelin.stm32@...il.com, linux-wireless@...r.kernel.org,
 netdev@...r.kernel.org, iwd@...ts.linux.dev
Subject: Re: [REGRESSION] Re: [PATCH] crypto: pkcs7: remove sha1 support

Hi,

On 3/13/24 12:44 PM, Eric Biggers wrote:
> On Wed, Mar 13, 2024 at 10:26:06AM -0700, James Prestwood wrote:
>> Hi,
>>
>> On 3/13/24 1:56 AM, Johannes Berg wrote:
>>> Not sure why you're CC'ing the world, but I guess adding a few more
>>> doesn't hurt ...
>>>
>>> On Wed, 2024-03-13 at 09:50 +0100, Karel Balej wrote:
>>>>    and I use iwd
>>> This is your problem, the wireless stack in the kernel doesn't use any
>>> kernel crypto code for 802.1X.
>> Yes, the wireless stack has zero bearing on the issue. I think that's what
>> you meant by "problem".
>>
>> IWD has used the kernel crypto API forever which was abruptly broken, that
>> is the problem.
>>
>> The original commit says it was to remove support for sha1 signed kernel
>> modules, but it did more than that and broke the keyctl API.
>>
> Which specific API is iwd using that is relevant here?
> I cloned https://kernel.googlesource.com/pub/scm/network/wireless/iwd
> and grepped for keyctl and AF_ALG, but there are no matches.

IWD uses ELL for its crypto, which uses the AF_ALG API:

https://git.kernel.org/pub/scm/libs/ell/ell.git/

I believe the failure is when calling:

KEYCTL_PKEY_QUERY enc="x962" hash="sha1"

 From logs Michael posted on the IWD list, the ELL API that fails is:

l_key_get_info (ell.git/ell/key.c:416)

Thanks,

James

>
> - Eric