platform_system_sepolicy/postinstall_dexopt.te

# Domain for the otapreopt executable, running under postinstall_dexopt
#
# Note: otapreopt is a driver for dex2oat, and reuses parts of installd. As such,
# this is derived and adapted from installd.te.

type postinstall_dexopt, domain;

# init_daemon_domain(otapreopt)
allow postinstall_dexopt self:capability { chown dac_override fowner setgid setuid };

allow postinstall_dexopt postinstall_file:dir { getattr search };
allow postinstall_dexopt proc:file { getattr open read };
allow postinstall_dexopt tmpfs:file read;

# Note: /data/ota is created by init (see system/core/rootdir/init.rc) to avoid giving access
# here and having to relabel the directory.

# Read app data (APKs) as input to dex2oat.
r_dir_file(postinstall_dexopt, apk_data_file)
# Access to app oat directory.
r_dir_file(postinstall_dexopt, dalvikcache_data_file)

# Read profile data.
allow postinstall_dexopt user_profile_data_file:dir { getattr search };
allow postinstall_dexopt user_profile_data_file:file r_file_perms;

# Write to /data/ota(/*). Create symlinks in /data/ota(/*)
allow postinstall_dexopt ota_data_file:dir create_dir_perms;
allow postinstall_dexopt ota_data_file:file create_file_perms;
allow postinstall_dexopt ota_data_file:lnk_file create_file_perms;

# Need to write .b files, which are dalvikcache_data_file, not ota_data_file.
# TODO: See whether we can apply ota_data_file?
allow postinstall_dexopt dalvikcache_data_file:dir rw_dir_perms;
allow postinstall_dexopt dalvikcache_data_file:file create_file_perms;

# Allow labeling of files under /data/app/com.example/oat/
# TODO: Restrict to .b suffix?
allow postinstall_dexopt dalvikcache_data_file:dir relabelto;
allow postinstall_dexopt dalvikcache_data_file:file { relabelto link };

# Check validity of SELinux context before use.
selinux_check_context(postinstall_dexopt)
selinux_check_access(postinstall_dexopt)

# Run dex2oat/patchoat in its own sandbox.
# We have to manually transition, as we don't have an entrypoint.
domain_auto_trans(postinstall_dexopt, postinstall_file, dex2oat)

# Postinstall wants to know about our child.
allow postinstall_dexopt postinstall:process sigchld;

# Allow otapreopt to use file descriptors from otapreopt_chroot.
# TODO: Probably we can actually close file descriptors...
allow postinstall_dexopt otapreopt_chroot:fd use;

allow postinstall_dexopt cpuctl_device:dir search;