zero-init everything passed by reference
An XCCDF Rule
Description
Zero-initialize any stack variables that may be passed by reference and had not already been explicitly initialized.
This configuration is available from kernel 4.14, but may be available if backported
by distros.
The configuration that was used to build kernel is available at /boot/config-*.
To check the configuration value for CONFIG_GCC_PLUGIN_STRUCTLEAK_BYREF_ALL, run the following command:
grep CONFIG_GCC_PLUGIN_STRUCTLEAK_BYREF_ALL /boot/config-*
For each kernel installed, a line with value "y" should be returned.
warning alert: Warning
There is no remediation for this besides re-compiling the kernel with the appropriate value for the config.
Rationale
This eliminates all classes of uninitialized stack variable exploits and information exposures.
- ID
- xccdf_org.ssgproject.content_rule_kernel_config_gcc_plugin_structleak_byref_all
- Severity
- Medium
- References
- Updated