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XCCDF
Guide to the Secure Configuration of Ubuntu 22.04
System Settings
Kernel Configuration
Disable legacy (BSD) PTY support
Disable legacy (BSD) PTY support
An XCCDF Rule
Details
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Disable legacy (BSD) PTY support
Medium Severity
Disable the Linux traditional BSD-like terminal names /dev/ptyxx for masters and /dev/ttyxx for slaves of pseudo terminals, and use only the modern ptys (devpts) interface. The configuration that was used to build kernel is available at
/boot/config-*
. To check the configuration value for
CONFIG_LEGACY_PTYS
, run the following command:
grep CONFIG_LEGACY_PTYS /boot/config-*
Configs with value 'n' are not explicitly set in the file, so either commented lines or no lines should be returned.