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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <87k0ua26gm.fsf@oldenburg2.str.redhat.com>
Date:   Tue, 24 Nov 2020 15:08:09 +0100
From:   Florian Weimer <fweimer@...hat.com>
To:     Christoph Hellwig <hch@...radead.org>
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

* Christoph Hellwig:

> On Tue, Nov 24, 2020 at 01:08:20PM +0100, Florian Weimer wrote:
>> This documents a way to safely use new security-related system calls
>> while preserving compatibility with container runtimes that require
>> insecure emulation (because they filter the system call by default).
>> Admittedly, it is somewhat hackish, but it can be implemented by
>> userspace today, for existing system calls such as faccessat2,
>> without kernel or container runtime changes.
>
> I think this is completely insane.  Tell the OCI folks to fix their
> completely broken specification instead.

Do you categorically reject the general advice, or specific instances as
well?  Like this workaround for faccessat that follows the pattern I
outlined:

<https://sourceware.org/pipermail/libc-alpha/2020-November/119955.html>

I value your feedback and want to make sure I capture it accurately.

Thanks,
Florian
-- 
Red Hat GmbH, https://de.redhat.com/ , Registered seat: Grasbrunn,
Commercial register: Amtsgericht Muenchen, HRB 153243,
Managing Directors: Charles Cachera, Brian Klemm, Laurie Krebs, Michael O'Neill