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-This directory contains a small port of libselinux for Android.
-It was originally forked in mid-2011, circa libselinux 2.1.0.
-Some changes have been cherry-picked from the upstream libselinux.
-Upstream git repository is https://github.com/SELinuxProject/selinux
-(libselinux subdirectory) and official releases are available from
-https://github.com/SELinuxProject/selinux/wiki/Releases.
-
-This fork differs from upstream libselinux in at least the following ways:
-
-* Dependencies on glibc-specific features have been removed/replaced
-in order to work with bionic,
-
-* Legacy code and compatibility interfaces have been removed,
-
-* Many interfaces, functions, and files are omitted since they are
-unused in Android,
-
-* The python bindings are omitted since they are unused in Android,
-
-* The setrans (context translation) support has been removed since
-there is no need for MLS label translation in Android and the support
-imposes extra overhead on calls passing security contexts,
-
-* The SELinux policy files are all located in / rather than under
-/etc/selinux since /etc is not available in Android until /system
-is mounted and use fixed paths, not dependent on /etc/selinux/config,
-
-* The kernel policy file (sepolicy in Android, policy.N in Linux) does
-not include a version suffix since Android does not need to support
-booting multiple kernels,
-
-* The policy loading logic does not support automatic downgrading of
-the kernel policy file to a version known to the kernel, since this
-requires libsepol on the device and is only needed to support mixing
-and matching kernels and userspace easily,
-
-* The selabel interface and label_file backend have been extended to
-support label-by-symlink and partial matching support for use by ueventd
-in labeling device nodes based on stable symlink names and by init for
-optimizing its restorecon_recursive of /sys,
-
-* Since the fork, upstream libselinux has switched the label_file
-backend to use a binary version of the file_contexts file
-(file_contexts.bin) that contains precompiled versions of the pcre
-regexes.  This reduces the time to load the file_contexts
-configuration, which in Linux can be significant due to the large
-number of entries (> 5000).  As Android has far fewer entries (~400),
-this has not yet seemed necessary.
-
-* restorecon functionality, including recursive restorecon, has been
-fully implemented within new libselinux functions, along with optimizations
-to prune the tree walk if no change has occurred in file_contexts since
-the last restorecon,
-
-* Support for new Android-specific SELinux configuration files, such
-as seapp_contexts, property_contexts, and service_contexts, has been
-added.
-
-New files added for Android:
-* libselinux/include/selinux/android.h
-* libselinux/src/android.c
-* libselinux/src/label_android_property.c (later added upstream)