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Date:   Sun, 12 May 2019 17:21:17 -0700
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Subject: Re: [PATCH v2 0/3] initramfs: add support for xattrs in the initial ram disk
To:     Mimi Zohar <zohar@linux.ibm.com>,
        Dominik Brodowski <linux@dominikbrodowski.net>
CC:     Roberto Sassu <roberto.sassu@huawei.com>, viro@zeniv.linux.org.uk,
        linux-security-module@vger.kernel.org,
        linux-integrity@vger.kernel.org, initramfs@vger.kernel.org,
        linux-api@vger.kernel.org, linux-fsdevel@vger.kernel.org,
        linux-kernel@vger.kernel.org, zohar@linux.vnet.ibm.com,
        silviu.vlasceanu@huawei.com, dmitry.kasatkin@huawei.com,
        takondra@cisco.com, kamensky@cisco.com, arnd@arndb.de,
        rob@landley.net, james.w.mcmechan@gmail.com
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On May 12, 2019 5:02:30 PM PDT, Mimi Zohar <zohar@linux=2Eibm=2Ecom> wrote:
>On Sun, 2019-05-12 at 17:31 +0200, Dominik Brodowski wrote:
>> On Sun, May 12, 2019 at 08:52:47AM -0400, Mimi Zohar wrote:
>
>
>> > It's too late=2E  The /init itself should be signed and verified=2E
>>=20
>> Could you elaborate a bit more about the threat model, and why
>deferring
>> this to the initramfs is too late?
>
>The IMA policy defines a number of different methods of identifying
>which files to measure, appraise, audit=2E[1] =C2=A0Without xattrs, the
>granularity of the policy rules is severely limited=2E =C2=A0Without xatt=
rs,
>a filesystem is either in policy, or not=2E
>
>With an IMA policy rule requiring rootfs (tmpfs) files to be verified,
>then /init needs to be properly labeled, otherwise /init will fail to
>execute=2E
>
>Mimi
>
>[1] Documentation/ABI/testing/ima_policy

And the question is what is the sense in that, especially if /init is prov=
ided as play of the kernel itself=2E
--=20
Sent from my Android device with K-9 Mail=2E Please excuse my brevity=2E