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+What:           security/ima/policy
+Date:           May 2008
+Contact:        Mimi Zohar <zohar@us.ibm.com>
+Description:
+                The Trusted Computing Group(TCG) runtime Integrity
+                Measurement Architecture(IMA) maintains a list of hash
+                values of executables and other sensitive system files
+                loaded into the run-time of this system.  At runtime,
+                the policy can be constrained based on LSM specific data.
+                Policies are loaded into the securityfs file ima/policy
+                by opening the file, writing the rules one at a time and
+                then closing the file.  The new policy takes effect after
+                the file ima/policy is closed.
+
+                rule format: action [condition ...]
+
+                action: measure | dont_measure
+                condition:= base | lsm
+                        base:   [[func=] [mask=] [fsmagic=] [uid=]]
+                        lsm:    [[subj_user=] [subj_role=] [subj_type=]
+                                 [obj_user=] [obj_role=] [obj_type=]]
+
+                base:   func:= [BPRM_CHECK][FILE_MMAP][INODE_PERMISSION]
+                        mask:= [MAY_READ] [MAY_WRITE] [MAY_APPEND] [MAY_EXEC]
+                        fsmagic:= hex value
+                        uid:= decimal value
+                lsm:    are LSM specific
+
+                default policy:
+                        # PROC_SUPER_MAGIC
+                        dont_measure fsmagic=0x9fa0
+                        # SYSFS_MAGIC
+                        dont_measure fsmagic=0x62656572
+                        # DEBUGFS_MAGIC
+                        dont_measure fsmagic=0x64626720
+                        # TMPFS_MAGIC
+                        dont_measure fsmagic=0x01021994
+                        # SECURITYFS_MAGIC
+                        dont_measure fsmagic=0x73636673
+
+                        measure func=BPRM_CHECK
+                        measure func=FILE_MMAP mask=MAY_EXEC
+                        measure func=INODE_PERM mask=MAY_READ uid=0
+
+                The default policy measures all executables in bprm_check,
+                all files mmapped executable in file_mmap, and all files
+                open for read by root in inode_permission.
+
+                Examples of LSM specific definitions:
+
+                SELinux:
+                        # SELINUX_MAGIC
+                        dont_measure fsmagic=0xF97CFF8C
+
+                        dont_measure obj_type=var_log_t
+                        dont_measure obj_type=auditd_log_t
+                        measure subj_user=system_u func=INODE_PERM mask=MAY_READ
+                        measure subj_role=system_r func=INODE_PERM mask=MAY_READ
+
+                Smack:
+                        measure subj_user=_ func=INODE_PERM mask=MAY_READ