Re: [PATCH RFC 2/2] mtd: ubi: add support for protecting critical volumes

[Zhihao Cheng <chengzhihao1@huawei.com>]

在 2024/9/29 20:26, Richard Weinberger 写道:
> ----- Ursprüngliche Mail -----
>> Von: "Daniel Golle" <daniel@makrotopia.org>
>> Allow the boot firmware to define volumes which are critical for the
>> system to boot, such as the bootloader itself if stored inside a UBI
>> volume. Protect critical volumes by preventing the user from removing,
>> resizing or writing to them, and also prevent the UBI device from
>> being detached if a critical volume is present.
> 
> I agree with the doubts raised in patch 1/2, if userspace is so hostile
> to delete system partitions, there is little hope.
> But I'm still open for discussion.

Yes, I agree that it is meaningful to prevent user from operating 
volumes accidently. How about doing that by some existing methods? Eg. 
selinux(Design sepolicy for ioctl cmd).
> 
> What I veto is preventing detach.
> This makes a clean tear down of the system impossible.
> It becomes more and more common that advanced userspace shuts down
> everything it setup during boot. e.g. while reboot switching back
> to an initramfs, umounting root, shutting down all storage, etc...
> 
> Thanks,
> //richard
> 
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