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    SubjectRe: [PATCH v4] kptr_restrict for hiding kernel pointers
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    > Hm, why is it off by default? Is there some user-space regression that is caused by
    > this?
    >
    > We really want good security measures to be active by default (and to work by
    > default) - they are not worth much if they are not.
    >

    I agree entirely, but I've received a lot of resistance to these types
    of changes in net. I'm afraid that if it's enabled by default, no one
    will actually allow use of the %pK specifier where it should be used.

    As far as I know, there's no actual breakage of anything in userspace,
    but there's a general "it might make it harder to debug things in
    certain limited circumstances" sentiment among some. I never understood
    why it is necessary for unprivileged users to be able to debug the
    kernel.

    Does anyone else have thoughts on this?

    > Thanks,
    >
    > Ingo




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