this post was submitted on 10 Jan 2025
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Like you said, it was just some early implementations of UEFI. I haven't heard of anything like this happening recently.
Also the kernel makes those variable immutable by default now, except the well known standard ones, so even for buggy UEFI this is mitigated nowadays. Just pointing out it came from a once legitimate space as a consequence of "everything is a file in a monolithic file namespace". Which on the one hand is bad if someone uses rm with all sorts of flags to overrule the "you don't want to do this" protections in the utility. On the other hand what you accidentally managed to do in Linux represented a problem that windows malware could have exploited.
More specifically it has done that for the last 8 years :-D