Re: [PATCH v14 00/26] ima: Namespace IMA with audit support in IMA-ns

Stefan Berger
2022-09-16T10:54:19Z

On 9/15/22 20:56, Casey Schaufler wrote:
> On 9/15/2022 12:31 PM, Stefan Berger wrote:
>> The goal of this series of patches is to start with the namespacing of
>> IMA and support auditing within an IMA namespace (IMA-ns) as the first
>> step.
>>
>> In this series the IMA namespace is piggybacking on the user namespace
>> and therefore an IMA namespace is created when a user namespace is
>> created, although this is done late when SecurityFS is mounted inside
>> a user namespace. The advantage of piggybacking on the user namespace
>> is that the user namespace can provide the keys infrastructure that IMA
>> appraisal support will need later on.
>>
>> We chose the goal of supporting auditing within an IMA namespace since it
>> requires the least changes to IMA. Following this series, auditing within
>> an IMA namespace can be activated by a root running the following lines
>> that rely on a statically linked busybox to be installed on the host for
>> execution within the minimal container environment:
>>
>> As root (since audit rules may now only be set by root):
>
> How about calling out the required capabilities? You don't need
> to be root, you need a specific set of capabilities. It would be
> very useful for the purposes of understanding the security value
> of the patch set to know this.
>
CAP_AUDIT_WRITE?