9ec532752d
Any FUSE filesystem will receive the 'fuse' type when mounted. It is possible to change this behaviour by specifying the "context=" or "fscontext=" option in mount(). Because 'fuse' has historically been used only for the emulated storage, it also received the 'sdcard_type' attribute. Replace the 'sdcard_type' attribute from 'fuse' with the new 'fusefs_type'. This attribute can be attached on derived types (such as app_fusefs). This change: - Remove the neverallow restriction on this new type. This means any custom FUSE implementation can be mounted/unmounted (if the correct allow rule is added). See domain.te. - Change the attribute of 'fuse' from 'sdcard_type' to 'fusefs_type'. See file.te. - Modify all references to 'sdcard_type' to explicitly include 'fuse' for compatibility reason. Bug: 177481425 Bug: 190804537 Test: Build and boot aosp_cf_x86_64_phone-userdebug Change-Id: Id4e410a049f72647accd4c3cf43eaa55e94c318f
265 lines
9.2 KiB
Text
265 lines
9.2 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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userfaultfd_use(zygote)
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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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# Allow zygote to find files in APEX data directories.
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allow zygote apex_module_data_file:dir search;
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# Allow zygote to find and map files created by on device signing.
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allow zygote apex_art_data_file:dir { getattr search };
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allow zygote apex_art_data_file:file { r_file_perms 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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# Relabel /data/user /data/user_de and /data/data
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allow zygote tmpfs:{ dir lnk_file } relabelfrom;
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allow zygote system_data_file:{ dir lnk_file } relabelto;
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# Zygote opens /mnt/expand to mount CE DE storage on each vol
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allow zygote mnt_expand_file:dir { open read search relabelto };
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# Bind mount subdirectories on /data/misc/profiles/cur and /data/misc/profiles/ref
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allow zygote { user_profile_root_file user_profile_data_file }:dir { mounton search };
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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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# Goes into media directory and bind mount obb directory
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allow zygote media_rw_data_file:dir { getattr search };
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# Bind mount on top of existing mounted obb and data directory
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allow zygote media_rw_data_file:dir { mounton };
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# Read if sdcardfs is supported
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allow zygote proc_filesystems:file r_file_perms;
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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 inode of directories for app data isolation
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allow zygote {
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app_data_file_type
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system_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 cgroup_v2:dir create_dir_perms;
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allow zygote cgroup_v2:{ file lnk_file } { r_file_perms setattr };
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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 fuse }:dir { create_dir_perms mounton };
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allow zygote { sdcard_type fuse }:file { create_file_perms };
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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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# Allow the zygote to access storage properties to check if sdcardfs is enabled.
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get_prop(zygote, storage_config_prop);
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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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# Allow the zygote to access window manager native boot feature flags
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# to initialize WindowManager static properties.
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get_prop(zygote, device_config_window_manager_native_boot_prop)
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# ingore spurious denials
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# fsetid can be checked as a consequence of chmod when using cgroup v2 uid/pid hierarchy. This is
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# done to determine if the file should inherit setgid. In this case, setgid on the file is
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# undesirable, so suppress the denial.
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dontaudit zygote self:global_capability_class_set { sys_resource fsetid };
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# Ignore spurious denials calling access() on fuse.
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# Also ignore read and open as sdcardfs may read and open dir when app tries to access a dir that
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# doesn't exist.
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# TODO(b/151316657): avoid the denials
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dontaudit zygote media_rw_data_file:dir { read open setattr };
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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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# Send unsolicited message to system_server
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unix_socket_send(zygote, system_unsolzygote, system_server)
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# Allow zygote to access media_variant_prop for static initialization
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get_prop(zygote, media_variant_prop)
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# Allow zygote to read ro.control_privapp_permissions and ro.cp_system_other_odex
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get_prop(zygote, packagemanager_config_prop)
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# Allow zygote to read qemu.sf.lcd_density
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get_prop(zygote, qemu_sf_lcd_density_prop)
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# Allow zygote to read /apex/apex-info-list.xml
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allow zygote apex_info_file:file r_file_perms;
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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
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# /data/dalvik-cache files or files generated during on-device
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# signing under /data/misc/apexdata/com.android.art/.
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neverallow zygote {
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data_file_type
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-apex_art_data_file # map PROT_EXEC
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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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# Zygote should not be able to access app private data.
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neverallow zygote app_data_file_type:dir ~getattr;
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