linux-kernel - Re: [PATCH] syscalls: Document OCI seccomp filter interactions & workaround

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Message-ID: <874kle3nwt.fsf@oldenburg2.str.redhat.com>
Date:   Tue, 24 Nov 2020 14:05:54 +0100
From:   Florian Weimer <fweimer@...hat.com>
To:     Aleksa Sarai <cyphar@...har.com>
Cc:     linux-api@...r.kernel.org, linux-doc@...r.kernel.org,
        linux-kernel@...r.kernel.org, dev@...ncontainers.org,
        corbet@....net, Carlos O'Donell <carlos@...hat.com>
Subject: Re: [PATCH] syscalls: Document OCI seccomp filter interactions &
 workaround

* Aleksa Sarai:

> As I mentioned in the runc thread[1], this is really down to Docker's
> default policy configuration. The EPERM-everything behaviour in OCI was
> inherited from Docker, and it boils down to not having an additional
> seccomp rule which does ENOSYS for unknown syscall numbers (Docker can
> just add the rule without modifying the OCI runtime-spec -- so it's
> something Docker can fix entirely on their own). I'll prepare a patch
> for Docker this week.

Appreciated, thanks.

> IMHO it's also slightly overkill to change the kernel API design
> guidelines in response to this issue.
>
> [1]: https://github.com/opencontainers/runc/issues/2151

Won't this cause docker to lose OCI compliance?  Or is the compliance
testing not that good?

Thanks,
Florian
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