OCI: OL8 oci-linux-config Package Overwrites /dev/shm Mount Options in /etc/fstab When It Is Updated

Applies To:

Oracle Cloud Infrastructure - Version N/A to N/A

Linux OS - Version Oracle Linux 8

Linux x86-64

Symptoms:

On OL8 OCI instances, /dev/shm is mounted with the "noexec" option. Even if manually removing that option in /etc/fstab, after a yum update, that option would return in /etc/fstab.

tmpfs                   /dev/shm                tmpfs   defaults,nodev,nosuid,noexec      0 0

Cause:

/usr/lib/oci-linux-config/fstab_note.sh is reverting that mount option. /usr/lib/oci-linux-config/fstab_note.sh is part of the packet scriptlet that gets executed during package updates.

This is the intended behavior because it adds security by preventing the possibility of ever executing anything inside