Consider the following union mount:
mount -t overlay -o lowerdir=/.pre-foo/lower,upperdir=/.pre-foo/upper,workdir=/.pre-foo/work overlay /foo
I would like to obfuscate that
/.pre-foo to minimize the chance of some process to modify my underlying folders while the union is mounted. I could get it with the following "recursive" mount:
mount -t overlay -o lowerdir=/foo/lower,upperdir=/foo/upper,workdir=/foo/work overlay /foo
My question is: Is this safe? Is there any security and/or performance risk in mounting an overlay "recursively"?