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Why do you need nodev mount option in Linux?
The nodev mount option specifies that the filesystem cannot contain special devices: This is a security precaution. You don’t want a user world-accessible filesystem like this to have the potential for the creation of character devices or access to random device hardware.
How to remount a filesystem as read / write?
How do I remount a filesystem as read/write? I’m trying to mount an hfsplus filesystem in a Xubuntu 12.04 VM (kernel version 3.2.0-23-generic) but when I type mount -o remount,rw /dev/sdb3 in command line it returns not mounted or bad option. Any help would be appreciated.
How to Secure Linux server with nodev, nosuid and noexec?
Follow these steps to secure your Linux server against this vulnerability: 1. Edit the file /etc/fstab, enter: 2. Locate the /tmp line: 3. Append the text ,nodev,nosuid,noexec to the list of mount options in column 4. The entry should look like this: 5. Save and close the file.
Can a non-superuser mount a filesystem?
The non-superuser mounts. Normally, only the superuser can mount filesystems. However, when fstab contains the user option on a line, anybody can mount the corresponding system.
What’s the difference between nodev and nosuid in Linux?
nodev – Don’t interpret block special devices on the filesystem. nosuid – Block the operation of suid, and sgid bits. But I would like a practical explanation what could happen if I leave those two out.
What do you need to know about nosuid Mount?
You don’t want a user world-accessible filesystem like this to have the potential for the creation of character devices or access to random device hardware. The nosuid mount option specifies that the filesystem cannot contain set userid files.
What can a non-root user do to harm the system?
Let’s say that I have configured tmpfs or ramfs (without these two mentioned options set) that is accessible (read+write) by a specific (non-root)user on the system. What can that user do to harm the system? Excluding the case of consuming all available system memory in case of ramfs You don’t have to follow this blindly as a hard rule.