this post was submitted on 10 Jan 2025
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    Lol, they locked all the posts for the community (infosec.pub)
    submitted 4 days ago by CubitOom@infosec.pub to c/linuxmemes@lemmy.world
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    [–] Kazumara@discuss.tchncs.de 17 points 4 days ago* (last edited 4 days ago) (1 children)

    In A UEFI World, "rm -rf /" Can Brick Your System

    efivars are made read only by the kernel. That firmware bug (!) was worked around in the kernel years ago.

    https://github.com/torvalds/linux/blob/master/Documentation/filesystems/efivarfs.rst

    Specifically in 2016: https://github.com/torvalds/linux/commit/ed8b0de5a33d2a2557dce7f9429dca8cb5bc5879

    [–] Jumuta@sh.itjust.works 3 points 3 days ago (1 children)

    uefi is cringe anyway, reject uefi and return to grub in the system firmware

    [–] Kazumara@discuss.tchncs.de 2 points 3 days ago (1 children)

    Firmware is one step before.

    BIOS, UEFI, coreboot, or whatever weird code runs on a Raspberry Pi's GPU to load your system, those are firmwares.

    The firmware is what starts your bootloader; grub, BOOTMGR, u-boot, etc

    [–] Jumuta@sh.itjust.works 1 points 3 days ago (1 children)

    even if my grub is in the system eeprom?

    [–] Kazumara@discuss.tchncs.de 1 points 2 days ago (1 children)

    Oh I've never heard of such a setup. But that does muddy the lines a bit, I can see the argument for calling it part of firmware then.

    [–] Jumuta@sh.itjust.works 1 points 2 days ago (2 children)

    yeah it's goofy, you can embed grub in coreboot cbfs and load straight into it, skipping the bios/uefi stage. it's a bit difficult to set up (and you need coreboot supported hardware) but when you get it working the boot times become really quick

    i just realised though that you can embed Linux into cbfs as well, does that then mean that Linux could be my kernel and firmware at the same time?

    [–] uranibaba@lemmy.world 1 points 1 day ago

    you can embed grub in coreboot cbfs and load straight into it, skipping the bios/uefi stage.

    Why would someone do that? *keeps reading*

    boot times become really quick

    Now I almost want to try it out.

    [–] Kazumara@discuss.tchncs.de 1 points 1 day ago

    Wow very cool. Thanks for that link, I had no idea coreboot was so flexible!