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    SubjectRe: [PATCH 1/2] fs/efivarfs: restrict inode permissions
    On Wed, Feb 21, 2018 at 11:47 AM, Luck, Tony <tony.luck@intel.com> wrote:
    >
    > The EFI calls are all about checking system configuration. A thing
    > that only a handful of users do on a very occasional basis. I don't
    > see much harm if my "efibootmgr -v" call is slowed down a bit (or even
    > a lot) because you are using a bunch of the available ratelimit reading
    > the efivars.
    >

    It's not about slowing down.

    It's about "user Xyz is messing with the system and reading efi vars
    all the time" resulting in "user 'torvalds' is installing a kernel,
    and actually wants to read efi vars, but can't".

    if you don't make it per-user, you're just replacing one DoS attack
    with another one!

    Linus

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