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Deny write access to hard drives #37
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Otherwise, an attacker can write to e.g. /dev/sda to bypass restrictions.
Other devices might also be able to be abused in similar ways. We should comb through all /dev permissions and make sure they can't be abused.
We might also want to remove read access to /dev/sd* in case an attacker can abuse it to e.g. read the kernel image on disk.