PERFORCE change 81723 for review
rwatson at FreeBSD.org
Tue Aug 9 11:24:58 GMT 2005
Change 81723 by rwatson at rwatson_peppercorn on 2005/08/09 11:24:43
Expand discussion of MAC Framework versioning.
Affected files ...
.. //depot/projects/trustedbsd/mac/sys/kern/kern_mac.c#447 edit
==== //depot/projects/trustedbsd/mac/sys/kern/kern_mac.c#447 (text+ko) ====
@@ -96,10 +96,21 @@
- * Declare that the kernel provides MAC support, version 1. This permits
- * modules to refuse to be loaded if the necessary support isn't present,
- * even if it's pre-boot.
+ * The TrustedBSD MAC Framework declares two version numbers in support of
+ * policy modules:
+ * - A linker version number, which declares the version of the MAC policy
+ * ABI.
+ * - A feature version number, relative to the linker version, which declares
+ * what if any optional features for the linker version are present. This
+ * supports the incremental addition of features in a FreeBSD RELENG
+ * branch.
+ * Modules will be unable to load if they do not match the current linker
+ * version due to ABI compatibility concerns. They may also test for support
+ * for specific API features that they depend on.
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