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Is there on Linux any mount options or anything else (that I can specify in /etc/fstab) that prevent the possibility for a filesystem to be remounted via mount -o remount,... ?

For example, let's assume that I have a ramfs populated and then mount read-only by the initial RAM disk that I do not want any users (including root) to be able to remount read/write.

Thanks.

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I am not aware of a general approach. And, of course, the question is: Whom are you defending against, a certain process or just anyone on a system even unconfined root?

In the case of ro you can make the underlying block device read-only:

blockdev --setro /dev/ram0

Of course, this just moves the question to: How do I prevent the block device from being set rw again...

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  • The idea is to "seal" somehow that filesystem, even against unconfined root... I am not sure that it makes sense anyway... however... thanks for the hint about "blockdev --setro" and, yes, this will simply move the question... any idea about how to prevent the block device from being set rw back again? Commented Sep 10 at 14:37

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