877dce40cb0d06ad6b66b4cb81310e2b52e3d9d9
These restrictions are implied by systemd options used for systemd-udevd.service, i.e. MountFlags=slave and IPAddressDeny=any. However, there are users out there getting tripped by this, so let's make things clear in the man page so the actual restrictions we implement by default have better visibility.
man: make clear that accessing network and mounting filesystems is not supported in udev rules (#7916)
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