77 lines
2.7 KiB
Text
77 lines
2.7 KiB
Text
Policy Generation:
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Additional, per device, policy files can be added into the
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policy build.
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They can be configured through the use of three variables,
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they are:
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1. BOARD_SEPOLICY_REPLACE
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2. BOARD_SEPOLICY_UNION
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3. BOARD_SEPOLICY_DIRS
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4. BOARD_SEPOLICY_IGNORE
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The variables should be set in the BoardConfig.mk file in
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the device or vendor directories.
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BOARD_SEPOLICY_UNION is a list of files that will be
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"unioned", IE concatenated, at the END of their respective
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file in external/sepolicy. Note, to add a unique file you
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would use this variable.
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BOARD_SEPOLICY_REPLACE is a list of files that will be
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used instead of the corresponding file in external/sepolicy.
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BOARD_SEPOLICY_DIRS contains a list of directories to search
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for BOARD_SEPOLICY_UNION and BOARD_SEPOLICY_REPLACE files. Order
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matters in this list.
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eg.) If you have BOARD_SEPOLICY_UNION := widget.te and have 2
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instances of widget.te files on BOARD_SEPOLICY_DIRS search path.
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The first one found (at the first search dir containing the file)
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gets processed first.
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Reviewing out/target/product/<device>/etc/sepolicy_intermediates/policy.conf
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will help sort out ordering issues.
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It is an error to specify a BOARD_POLICY_REPLACE file that does
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not exist in external/sepolicy.
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It is an error to specify a BOARD_POLICY_REPLACE file that appears
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multiple times on the policy search path defined by BOARD_SEPOLICY_DIRS.
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eg.) if you specify shell.te in BOARD_SEPOLICY_REPLACE and
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BOARD_SEPOLICY_DIRS is set to
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"vendor/widget/common/sepolicy device/widget/x/sepolicy" and shell.te
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appears in both locations, it is an error. Unless it is in
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BOARD_SEPOLICY_IGNORE to be filtered out. See BOARD_SEPOLICY_IGNORE
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for more details.
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It is an error to specify the same file name in both
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BOARD_POLICY_REPLACE and BOARD_POLICY_UNION.
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It is an error to specify a BOARD_SEPOLICY_DIRS that has no entries when
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specifying BOARD_SEPOLICY_REPLACE.
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BOARD_SEPOLICY_IGNORE is a list of paths (directory + filename) of
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files that are not to be included in the resulting policy. This list
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is passed to filter-out to remove any paths you may want to ignore. This
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is useful if you have numerous config directories that contain a file
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and you want to NOT include a particular file in your resulting
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policy file, either by UNION or REPLACE.
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Eg.) Suppose the follwoing:
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BOARD_SEPOLICY_DIRS := X Y
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BOARD_SEPOLICY_REPLACE := A
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BOARD_SEPOLICY_IGNORE := X/A
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Directories X and Y contain A.
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The resulting policy is created by using Y/A only, thus X/A was
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ignored.
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Example BoardConfig.mk Usage:
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From the Tuna device BoardConfig.mk, device/samsung/tuna/BoardConfig.mk
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BOARD_SEPOLICY_DIRS := \
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device/samsung/tuna/sepolicy
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BOARD_SEPOLICY_UNION := \
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genfs_contexts \
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file_contexts \
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sepolicy.te
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