On Thu, 13 Jul 2017 10:29:06 -0400 Mike Gilbert wrote: > On Thu, Jul 13, 2017 at 7:35 AM, M. J. Everitt <m.j.ever...@iee.org> wrote: > > On 13/07/17 12:09, Rich Freeman wrote: > >> Presumably you'd only want to remount it if it was mounted ro to > >> start, since it sounds like openrc will be diverging from systemd > >> behavior here. > >> > >> While it seems like a good idea I'm not sure how big an improvement it > >> is in the larger scheme. We're worried about root accidentially > >> modifying efivars, but we have no safeguards against root writing to > >> /dev/sda, and the latter seems much more likely to cause harm, and is > >> harder to fix. > >> > > In case you weren't aware, Rich, rewriting the efivars actually writes > > to the system BIOS, which renders the computer completely unbootable .. > > not quite the same as erasing the boot sector of your hard disk, where > > you simply plug in another device, and Off you go ... > > > > We are actually talking about protecting people who run something like > rm -rf /sys/firmware/efi/efivars/ as root. > > If you are dumb enough to do something like that, you almost deserve > to spend a couple hundred on a new motherboard. Or just rm -rf / [pedantic] of course with newer rm versions one needs to run: rm -rf --no-preserve-root / or rm -rf /* /.* [/pedantic]
But in some scenarios this command is normal. E.g. user installs Gentoo from some live dvd/flash, makes some mistakes, understands that system is broken beyond repair and decides to start over again. If there is no need to recreate filesystem itself or partition layout, running rm -rf / as above is quite reasonable. When running this command user expects to kill the data, but not the hardware. That is my point. I can't call such action dumb. Best regards, Andrew Savchenko
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