125 lines
4.9 KiB
Text
125 lines
4.9 KiB
Text
# zygote
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type zygote, domain, domain_deprecated;
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type zygote_exec, exec_type, file_type;
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init_daemon_domain(zygote)
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typeattribute zygote mlstrustedsubject;
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# Override DAC on files and switch uid/gid.
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allow zygote self:capability { dac_override setgid setuid fowner chown };
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# Drop capabilities from bounding set.
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allow zygote self:capability setpcap;
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# Switch SELinux context to app domains.
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allow zygote self:process setcurrent;
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allow zygote system_server:process dyntransition;
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allow zygote { appdomain autoplay_app }:process dyntransition;
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# Allow zygote to read app /proc/pid dirs (b/10455872)
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allow zygote { appdomain autoplay_app }:dir { getattr search };
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allow zygote { appdomain autoplay_app }:file { r_file_perms };
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# Move children into the peer process group.
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allow zygote system_server:process { getpgid setpgid };
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allow zygote { appdomain autoplay_app }:process { getpgid setpgid };
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# Read system data.
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allow zygote system_data_file:dir r_dir_perms;
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allow zygote system_data_file:file r_file_perms;
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# Write to /data/dalvik-cache.
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allow zygote dalvikcache_data_file:dir create_dir_perms;
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allow zygote dalvikcache_data_file:file create_file_perms;
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# Create symlinks in /data/dalvik-cache
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allow zygote dalvikcache_data_file:lnk_file create_file_perms;
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# Write to /data/resource-cache
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allow zygote resourcecache_data_file:dir rw_dir_perms;
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allow zygote resourcecache_data_file:file create_file_perms;
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# For art.
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allow zygote dalvikcache_data_file:file execute;
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# Execute idmap and dex2oat within zygote's own domain.
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# TODO: Should either of these be transitioned to the same domain
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# used by installd or stay in-domain for zygote?
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allow zygote idmap_exec:file rx_file_perms;
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allow zygote dex2oat_exec:file rx_file_perms;
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# Control cgroups.
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allow zygote cgroup:dir create_dir_perms;
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allow zygote self:capability sys_admin;
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# Check validity of SELinux context before use.
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selinux_check_context(zygote)
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# Check SELinux permissions.
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selinux_check_access(zygote)
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# Read /seapp_contexts and /data/security/seapp_contexts
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security_access_policy(zygote)
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# Native bridge functionality requires that zygote replaces
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# /proc/cpuinfo with /system/lib/<ISA>/cpuinfo using a bind mount
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allow zygote proc_cpuinfo:file mounton;
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# Allow remounting rootfs as MS_SLAVE
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allow zygote rootfs:dir mounton;
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allow zygote tmpfs:filesystem { mount unmount };
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allow zygote fuse:filesystem { unmount };
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allow zygote sdcardfs:filesystem { unmount };
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# Allowed to create user-specific storage source if started before vold
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allow zygote mnt_user_file:dir create_dir_perms;
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allow zygote mnt_user_file:lnk_file create_file_perms;
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# Allowed to mount user-specific storage into place
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allow zygote storage_file:dir { search mounton };
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# Handle --invoke-with command when launching Zygote with a wrapper command.
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allow zygote zygote_exec:file rx_file_perms;
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# Read access to pseudo filesystems.
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r_dir_file(zygote, proc_net)
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# Root fs.
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allow zygote rootfs:file r_file_perms;
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# System file accesses.
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allow zygote system_file:dir r_dir_perms;
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allow zygote system_file:file r_file_perms;
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userdebug_or_eng(`
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# Allow zygote to create and write method traces in /data/misc/trace.
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allow zygote method_trace_data_file:dir w_dir_perms;
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allow zygote method_trace_data_file:file { create w_file_perms };
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')
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###
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### A/B OTA
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###
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# The zygote is responsible for detecting A/B OTA artifacts and moving them into
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# the actual dalvik-cache.
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# Allow zygote access to files in /data/ota.
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# This includes reading symlinks in /data/ota/dalvik-cache. This is required for PIC mode boot
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# images, where the oat file is symlinked to the original file in /system.
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r_dir_file(zygote, ota_data_file)
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# The zygote renames the OTA dalvik-cache to the regular dalvik-cache.
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allow zygote ota_data_file:dir { rw_dir_perms rename reparent };
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# And needs to relabel the entries, so as to have the dalvikcache_data_file label.
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allow zygote ota_data_file:{ dir file lnk_file } relabelfrom;
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allow zygote dalvikcache_data_file:{ dir file lnk_file } relabelto;
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# The zygote also cleans up the now-empty dalvik-cache directory after an OTA.
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# In case something goes wrong in relabelling, we also need to be able to delete the files that
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# have already been moved.
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allow zygote ota_data_file:dir rmdir;
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allow zygote ota_data_file:{ file lnk_file } unlink;
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###
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### neverallow rules
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###
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# Ensure that all types assigned to app processes are included
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# in the appdomain attribute, so that all allow and neverallow rules
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# written on appdomain are applied to all app processes.
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# This is achieved by ensuring that it is impossible for zygote to
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# setcon (dyntransition) to any types other than those associated
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# with appdomain plus system_server.
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neverallow zygote ~{ appdomain autoplay_app system_server }:process dyntransition;
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# Zygote should never execute anything from /data except for /data/dalvik-cache files.
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neverallow zygote {
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data_file_type
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-dalvikcache_data_file # map PROT_EXEC
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}:file no_x_file_perms;
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