[CentOS] How bad is "rm -rf /" ?
Gordon Messmer
gordon.messmer at gmail.com
Sat Feb 6 04:48:57 UTC 2016
On 02/05/2016 06:31 PM, Mark LaPierre wrote:
> So let me get this straight. You are saying that you can make changes
> to the MB ROM/EPROM/whatever hardware the vendor uses, by issuing an
> erase command on a hard drive?
No, but you can erase the UEFI variables by issuing "rm" on them if the
OS presents them as a part of the filesystem, as Linux does. You know,
the UNIX design philosophy of "everything is a file"?
Not all of the filesystem represents sectors on a hard drive.
> You might be able to trash the system on the HD to a point that it is
> unrecoverable. I will believe that.
>
> When you're done trashing the system you just have to reinstall the
> system just like you would with a clean new HD.
https://github.com/systemd/systemd/issues/2402
On some systems, wiping the UEFI variables renders the system completely
unbootable. It shouldn't, but there are some bad UEFI implementations
out there.
> All that UEFI crap is built into the MB in Read Only hardware. A new HD
> does not come with any of the UEFI files or directories already on the
> disk. All that is created at the initial install. Blowing them away
> with a remove command does nothing to the MB hardware because it's Read
> Only hardware.
The UEFI configuration is entirely RW.
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