platform_system_sepolicy/zygote.te

# zygote
type zygote, domain;
type zygote_exec, exec_type, file_type;

init_daemon_domain(zygote)
typeattribute zygote mlstrustedsubject;
# Override DAC on files and switch uid/gid.
allow zygote self:capability { dac_override setgid setuid fowner chown };
# Drop capabilities from bounding set.
allow zygote self:capability setpcap;
# Switch SELinux context to app domains.
allow zygote self:process setcurrent;
allow zygote system_server:process dyntransition;
allow zygote appdomain:process dyntransition;
# Allow zygote to read app /proc/pid dirs (b/10455872)
allow zygote appdomain:dir { getattr search };
allow zygote appdomain:file { r_file_perms };
# Move children into the peer process group.
allow zygote system_server:process { getpgid setpgid };
allow zygote appdomain:process { getpgid setpgid };
# Read system data.
allow zygote system_data_file:dir r_dir_perms;
allow zygote system_data_file:file r_file_perms;
# Write to /data/dalvik-cache.
allow zygote dalvikcache_data_file:dir create_dir_perms;
allow zygote dalvikcache_data_file:file create_file_perms;
# Create symlinks in /data/dalvik-cache
allow zygote dalvikcache_data_file:lnk_file create_file_perms;
# Write to /data/resource-cache
allow zygote resourcecache_data_file:dir rw_dir_perms;
allow zygote resourcecache_data_file:file create_file_perms;
# For art.
allow zygote dalvikcache_data_file:file execute;
# Execute dexopt.
allow zygote system_file:file x_file_perms;
allow zygote dex2oat_exec:file rx_file_perms;
# Control cgroups.
allow zygote cgroup:dir create_dir_perms;
allow zygote self:capability sys_admin;
# Check validity of SELinux context before use.
selinux_check_context(zygote)
# Check SELinux permissions.
selinux_check_access(zygote)
# Read /seapp_contexts and /data/security/seapp_contexts
security_access_policy(zygote)

# Native bridge functionality requires that zygote replaces
# /proc/cpuinfo with /system/lib/<ISA>/cpuinfo using a bind mount
allow zygote proc_cpuinfo:file mounton;

# Allow remounting rootfs as MS_SLAVE
allow zygote rootfs:dir mounton;
allow zygote sdcard_type:dir { write search setattr create add_name mounton }; # TODO: deprecated in M
dontaudit zygote self:capability fsetid; # TODO: deprecated in M
allow zygote tmpfs:dir { write create add_name setattr mounton search }; # TODO: deprecated in M
allow zygote tmpfs:filesystem { mount unmount };
allow zygote labeledfs:filesystem remount; # TODO: deprecated in M

# Allowed to create user-specific storage source if started before vold
allow zygote mnt_user_file:dir create_dir_perms;
allow zygote mnt_user_file:lnk_file create_file_perms;
# Allowed to mount user-specific storage into place
allow zygote storage_file:dir { search mounton };

# Handle --invoke-with command when launching Zygote with a wrapper command.
allow zygote zygote_exec:file rx_file_perms;

###
### neverallow rules
###

# Ensure that all types assigned to app processes are included
# in the appdomain attribute, so that all allow and neverallow rules
# written on appdomain are applied to all app processes.
# This is achieved by ensuring that it is impossible for zygote to
# setcon (dyntransition) to any types other than those associated
# with appdomain plus system_server.
neverallow zygote ~{ appdomain system_server }:process dyntransition;