On Sun, 07 Feb 2016 13:10:16 +0000, Rainer wrote in message <87h9hkmzt3....@doppelsaurus.mobileactivedefense.com>:
> Arnt Karlsen <a...@iaksess.no> writes: > > > [...] > > >> > /sys/firmware/ and everything in it is mounted rw on my Gigabyte > >> > legacy board with Devuan installed. > >> > >> That's true on my non=efi system, too, but it has > >> no /sys/firmware/efi. > > > > ..can an efi board set up with legacy boot and running e.g. sys-v, > > be tricked into bricking itself e.g. by reading an "ad" flash movie > > off a web site and writing it into a new bad /sys/firmware/efi and > > then "try" a kexec reboot? Etc? > > As far as I remember, I'm using an EFI-capable system in legacy > mode[*] and the efivarfs module can't be inserted into my kernel. > It's rejected with > > ERROR: could not insert 'efivarfs': No such device > > But this may be different on other systems and there's reportedly > also a /sys-based older interface for accessing the EFI variable > service. It should be possible to test this with > > modprobe efivarfs > > one could also remove the module (mine is called > > 4.5.0-rc2-net/kernel/fs/efivarfs/efivarfs.ko ..these are the fairy tales we are told nowadays. ..can a Devuan box be bricked etc with such EFI/systemd type stunts using _other_, non-EFI, non-systemd names??? > ) or compile a kernel without support for the efivarfs (File systems/ > Pseudo filesystems/ EFI Variable filesystem) or without any support > for EFI runtime services (Processor type and features/ EFI runtime > service support) > > [*] I installed that by taking the disk out and connecting it to my > former work computer, followed by copying the old system and then > switched everything off which looked unfamiliar/ fishy during first > boot of the new one without paying much attention to that. ..sounds familiar, I have a laptop disk running in its 5th machine, online with "wlan4"... once I yank "eth2"... ;oD -- ..med vennlig hilsen = with Kind Regards from Arnt Karlsen ...with a number of polar bear hunters in his ancestry... Scenarios always come in sets of three: best case, worst case, and just in case. _______________________________________________ Dng mailing list Dng@lists.dyne.org https://mailinglists.dyne.org/cgi-bin/mailman/listinfo/dng
