fcf599c89c
/mnt/pass_through was introduced to allow the FUSE daemon unrestricted access to the lower filesystem (or sdcardfs). At zygote fork time, the FUSE daemon will have /mnt/pass_through/0 bind mounted to /storage instead of /mnt/user/0. To keep /sdcard (symlink to /storage/self/primary) paths working, we create a 'self' directory with an additional 'primary' symlink to /mnt/pass_through/0/emulated/0 which is a FUSE mount point. The following components need varying sepolicy privileges: Vold: Creates the self/primary symlink and mounts the lower filesystem on /mnt/pass_through/0/emulated. So needs create_dir and mount access + create_file access for the symlink zygote: In case zygote starts an app before vold sets up the paths. This is unlikely but can happen if the FUSE daemon (a zygote forked app) is started before system_server completes vold mounts. Same sepolicy requirements as vold installd: Needs to clear/destroy app data using lower filesystem mounted on /mnt/pass_through so needs read_dir access to walk /mnt/pass_through priv_app (FUSE daemon): Needs to server content from the lower filesystem mounted on /mnt/pass_through so needs read_dir access to walk /mnt/pass_through Bug: 135341433 Test: adb shell ls /mnt/pass_through/0/self/primary Change-Id: I16e35b9007c2143282600c56adbc9468a1b7f240
212 lines
6.8 KiB
Text
212 lines
6.8 KiB
Text
# zygote
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typeattribute zygote coredomain;
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typeattribute zygote mlstrustedsubject;
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init_daemon_domain(zygote)
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tmpfs_domain(zygote)
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read_runtime_log_tags(zygote)
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# Override DAC on files and switch uid/gid.
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allow zygote self:global_capability_class_set { dac_override dac_read_search setgid setuid fowner chown };
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# Drop capabilities from bounding set.
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allow zygote self:global_capability_class_set 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_startup:process dyntransition;
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allow zygote appdomain:process dyntransition;
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allow zygote webview_zygote:process dyntransition;
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allow zygote app_zygote:process dyntransition;
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# Allow zygote to read app /proc/pid dirs (b/10455872).
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allow zygote appdomain:dir { getattr search };
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allow zygote appdomain: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:process { getpgid setpgid };
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allow zygote webview_zygote:process { getpgid setpgid };
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allow zygote app_zygote: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 updateability, the zygote may fetch the current boot
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# classpath from the dalvik cache. Integrity of the files
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# is ensured by fsverity protection (checked in art_apex_boot_integrity).
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allow zygote dalvikcache_data_file:file execute;
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# Bind mount on /data/data and mounted volumes
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allow zygote { system_data_file mnt_expand_file }:dir mounton;
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# Create and bind dirs on /data/data
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allow zygote tmpfs:dir { create_dir_perms mounton };
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# Create symlink for /data/user/0
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allow zygote tmpfs:lnk_file create;
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allow zygote mirror_data_file:dir r_dir_perms;
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# Get and set data directories
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allow zygote {
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system_data_file
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radio_data_file
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app_data_file
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shell_data_file
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bluetooth_data_file
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privapp_data_file
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nfc_data_file
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mnt_expand_file
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}:dir getattr;
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# Allow zygote to create JIT memory.
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allow zygote self:process execmem;
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allow zygote zygote_tmpfs:file execute;
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allow zygote ashmem_libcutils_device:chr_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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# Allow apps access to /vendor/overlay
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r_dir_file(zygote, vendor_overlay_file)
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# Control cgroups.
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allow zygote cgroup:dir create_dir_perms;
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allow zygote cgroup:{ file lnk_file } r_file_perms;
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allow zygote self:global_capability_class_set sys_admin;
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# Allow zygote to stat the files that it opens. The zygote must
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# be able to inspect them so that it can reopen them on fork
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# if necessary: b/30963384.
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allow zygote pmsg_device:chr_file getattr;
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allow zygote debugfs_trace_marker:file getattr;
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# Get seapp_contexts
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allow zygote seapp_contexts_file:file r_file_perms;
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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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# 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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# Allow creating user-specific storage source if started before vold.
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allow zygote mnt_user_file:dir { create_dir_perms mounton };
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allow zygote mnt_user_file:lnk_file create_file_perms;
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allow zygote mnt_user_file:file create_file_perms;
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# Allow mounting user-specific storage source if started before vold.
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allow zygote mnt_pass_through_file:dir { create_dir_perms mounton };
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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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# Allow mounting and creating files, dirs on sdcardfs.
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allow zygote { sdcard_type }:dir { create_dir_perms mounton };
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allow zygote { sdcard_type }:file { create_file_perms };
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# Allow zygote to expand app files while preloading libraries
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allow zygote mnt_expand_file:dir getattr;
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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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# Allow zygote to write to statsd.
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unix_socket_send(zygote, statsdw, statsd)
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# Root fs.
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r_dir_file(zygote, rootfs)
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# System file accesses.
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r_dir_file(zygote, system_file)
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# /oem accesses.
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allow zygote oemfs:dir search;
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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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allow zygote ion_device:chr_file r_file_perms;
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allow zygote tmpfs:dir r_dir_perms;
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allow zygote same_process_hal_file:file { execute read open getattr map };
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# Let the zygote access overlays so it can initialize the AssetManager.
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get_prop(zygote, overlay_prop)
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get_prop(zygote, exported_overlay_prop)
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# Allow the zygote to access the runtime feature flag properties.
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get_prop(zygote, device_config_runtime_native_prop)
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get_prop(zygote, device_config_runtime_native_boot_prop)
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# ingore spurious denials
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dontaudit zygote self:global_capability_class_set sys_resource;
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# Allow zygote to use ashmem fds from system_server.
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allow zygote system_server:fd use;
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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_startup, webview_zygote and
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# app_zygote.
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neverallow zygote ~{
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appdomain
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system_server_startup
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webview_zygote
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app_zygote
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}: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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# Do not allow access to Bluetooth-related system properties and files
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neverallow zygote {
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bluetooth_a2dp_offload_prop
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bluetooth_audio_hal_prop
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bluetooth_prop
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exported_bluetooth_prop
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}:file create_file_perms;
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# Do not allow zygote to access app data except getting attributes and relabeling to.
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neverallow zygote {
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privapp_data_file
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app_data_file
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}:dir ~getattr;
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