Re: [PATCH] crypto: af_alg - Add af_alg_restrict sysctl, defaulting to 1

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Message-ID: <[email protected]>
Date: Tue, 23 Jun 2026 22:09:27 -0400
MIME-Version: 1.0
User-Agent: Mozilla Thunderbird
Subject: Re: [PATCH] crypto: af_alg - Add af_alg_restrict sysctl, defaulting
 to 1
To: Eric Biggers <[email protected]>, Andy Lutomirski <[email protected]>
Cc: [email protected], Herbert Xu <[email protected]>,
 [email protected], [email protected],
 [email protected], [email protected],
 [email protected], Milan Broz <[email protected]>
References: <[email protected]>
 <CALCETrXPj0u=FZ=aFcZAHk3fFZa7rCuPEjx6cOMXmT3sdkC7SA@mail.gmail.com>
 <[email protected]>
Content-Language: en-US
From: Demi Marie Obenour <[email protected]>
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In-Reply-To: <[email protected]>

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On 6/23/26 15:27, Eric Biggers wrote:
> On Tue, Jun 23, 2026 at 12:12:24PM -0700, Andy Lutomirski wrote:
>> On Mon, Jun 22, 2026 at 4:49=E2=80=AFPM Eric Biggers <ebiggers@kernel.=
org> wrote:
>>>
>>> AF_ALG is a frequent source of vulnerabilities and a maintenance
>>> nightmare.  It exposes far more functionality to userspace than ever
>>> should have been exposed, especially to unprivileged processes.  Rece=
nt
>>> exploits have targeted kernel internal implementation details like
>>> "authencesn" that have zero use case for userspace access.
>>>
>>> Fortunately, AF_ALG is rarely used in practice, as userspace crypto
>>> libraries exist.  And when it is used, only some functionality is kno=
wn
>>> to be used, and many users are known to hold capabilities already.
>>> iwd for example requires CAP_NET_ADMIN and has a known algorithm list=

>>> (https://lore.kernel.org/linux-crypto/bcbbef00-5881-421b-8892-7be6c04=
[email protected]/).
>>>
>>> Thus, let's restrict the set of allowed algorithms by default, depend=
ing
>>> on the capabilities held.
>>>
>>> Add a sysctl /proc/sys/crypto/af_alg_restrict with meaning:
>>>
>>>     0: unrestricted
>>>     1: limited functionality
>>>     2: completely disabled
>>>
>>> Set the default value to 1, which enables an algorithm allowlist for
>>> unprivileged processes and a slightly longer allowlist for privileged=

>>> processes.
>>
>> In our brave new world of containers, this is a bit awkward.  The
>> admin is sort of asking two separate questions:
>>
>> 1. Is the actual running distro and its privileged components capable
>> of working without AF_ALG or with only the parts marked as being
>> unprivileged?
>>
>> 2. Is the system running contains that need the unprivileged parts?
>> (Which is maybe just sha1 for ip?  I really don't know.)
>>
>> Should there maybe be two separate options so that all options are
>> available?  Or maybe something between 2 and 3 that means "limited
>> functionality and privileged modes are completely disabled"?
>=20
> If we want to offer more settings we could.  I could see this getting
> quite complex pretty quickly once everyone weighs in, though.  There's
> quite a bit of value in keeping things simple, even if the offered
> settings won't be optimal for every case.
>=20
> - Eric

What about exposing both allowlists to userspace and making them
configurable?

I'm mostly concerned about systems running code (possibly
closed-source) that uses algorithms that nobody here knows about.
It would be better to allow a single algorithm than to turn off all
restrictions.
--=20
Sincerely,
Demi Marie Obenour (she/her/hers)
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Content-Type: application/pgp-signature; name="OpenPGP_signature.asc"
Content-Description: OpenPGP digital signature
Content-Disposition: attachment; filename="OpenPGP_signature.asc"

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