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XCCDF
Guide to the Secure Configuration of Fedora
System Settings
Kernel Configuration
Enable poison of pages after freeing
Enable poison of pages after freeing
An XCCDF Rule
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Enable poison of pages after freeing
Medium Severity
Fill the pages with poison patterns after free_pages() and verify the patterns before alloc_pages. This does have a potential performance impact if enabled with the "page_poison=1" kernel boot option. This configuration is available from kernel 4.6. The configuration that was used to build kernel is available at
/boot/config-*
. To check the configuration value for
CONFIG_PAGE_POISONING
, run the following command:
grep CONFIG_PAGE_POISONING /boot/config-*
For each kernel installed, a line with value "y" should be returned.