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SubjectRe: [PATCH v5 01/13] taint: Introduce a new taint flag (insecure)
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On February 5, 2019 2:46:11 PM PST, Randy Dunlap <rdunlap@infradead.org> wrote:
>On 2/5/19 1:21 PM, Andrew Morton wrote:
>> On Fri, 1 Feb 2019 18:42:29 -0800 Andy Lutomirski <luto@kernel.org>
>wrote:
>>
>>> On Fri, Feb 1, 2019 at 12:54 PM Chang S. Bae
><chang.seok.bae@intel.com> wrote:
>>>>
>>>> For testing (or root-only) purposes, the new flag will serve to tag
>the
>>>> kernel taint accurately.
>>>>
>>>> When adding a new feature support, patches need to be incrementally
>>>> applied and tested with temporal parameters. Currently, there is no
>flag
>>>> for this usage.
>>>
>>> I think this should be reviewed by someone like akpm. akpm, for
>>> background, this is part of an x86 patch series. If only part of
>the
>>> series is applied, the kernel will be blatantly insecure (but still
>>> functional and useful for testing and bisection), and this taint
>flag
>>> will be set if this kernel is booted. With the whole series
>applied,
>>> there are no users of the taint flag in the kernel.
>>>
>>> Do you think this is a good idea?
>>
>> What does "temporal parameters" mean? A complete description of this
>> testing process would help.
>>
>> I sounds a bit strange. You mean it assumes that people will
>partially
>> apply the series to test its functionality? That would be
>inconvenient.
>
>Ack. I don't think we need to (or should) worry about that kind of
>muckup.
>
>> - Can the new and now-unused taint flag be removed again at
>> end-of-series?
>>
>> - It would be a lot more convenient if we had some means of testing
>> after the whole series is applied, on a permanent basis - some
>> debugfs flag, perhaps?
>>

I would like to see this taint flag, though, because sometimes it is useful to write test modules (e.g. when I was testing SMAP) which are dangerous even if out of tree.

In case of an escape or pilot error gets it into the wrong kernel, it is a very good thing to have the kernel flagged.
--
Sent from my Android device with K-9 Mail. Please excuse my brevity.

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