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SubjectRe: [PATCH v5 01/13] taint: Introduce a new taint flag (insecure)
On February 5, 2019 2:46:11 PM PST, Randy Dunlap <> wrote:
>On 2/5/19 1:21 PM, Andrew Morton wrote:
>> On Fri, 1 Feb 2019 18:42:29 -0800 Andy Lutomirski <>
>>> On Fri, Feb 1, 2019 at 12:54 PM Chang S. Bae
><> wrote:
>>>> For testing (or root-only) purposes, the new flag will serve to tag
>>>> kernel taint accurately.
>>>> When adding a new feature support, patches need to be incrementally
>>>> applied and tested with temporal parameters. Currently, there is no
>>>> 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
>>> series is applied, the kernel will be blatantly insecure (but still
>>> functional and useful for testing and bisection), and this taint
>>> will be set if this kernel is booted. With the whole series
>>> 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
>> apply the series to test its functionality? That would be
>Ack. I don't think we need to (or should) worry about that kind of
>> - 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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