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    SubjectRe: [RFC PATCH] rootfs: force mounting rootfs as tmpfs
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    On Thu, 2018-02-01 at 11:09 -0600, Rob Landley wrote:
    > On 02/01/2018 09:55 AM, Mimi Zohar wrote:
    > > On Thu, 2018-02-01 at 09:20 -0600, Rob Landley wrote:
    > >
    > >>> With your patch and specifying "root=tmpfs", dracut is complaining:
    > >>>
    > >>> dracut: FATAL: Don't know how to handle 'root=tmpfs'
    > >>> dracut: refusing to continue
    > >>
    > >> [googles]... I do not understand why this package exists.
    > >>
    > >> If you're switching to another root filesystem, using a tool that
    > >> wikipedia[citation needed] says has no purpose but to switch to another
    > >> root filesystem, (so let's reproduce the kernel infrastructure in
    > >> userspace while leaving it the kernel too)... why do you need initramfs
    > >> to be tmpfs? You're using it for half a second, then discarding it,
    > >> what's the point of it being tmpfs?
    > >
    > > Unlike the kernel image which is signed by the distros, the initramfs
    > > doesn't come signed, because it is built on the target system.  Even
    > > if the initramfs did come signed, it is beneficial to measure and
    > > appraise the individual files in the initramfs.
    >
    > You can still shoot yourself in the foot with tmpfs. People mount a /run
    > and a /tmp and then as a normal user you can go
    > https://twitter.com/landley/status/959103235305951233 and maybe the
    > default should be a little more clever there...
    >
    > I'll throw it on the todo heap. :)
    >
    > >> Sigh. If people are ok with having rootfs just be tmpfs whenever tmpfs
    > >> is configured in, even when you're then going to overmount it with
    > >> something else like you're doing, let's just _remove_ the test. If it
    > >> can be tmpfs, have it be tmpfs.
    > >
    > > Very much appreciated!
    >
    > Not yet tested, but something like the attached? (Sorry for the
    > half-finished doc changes in there, I'm at work and have a 5 minute
    > break. I can test properly this evening if you don't get to it...)

    Yes, rootfs is being mounted as tmpfs.

    Mimi

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