23c9d91b46
Currently, both untrusted apps and priv-apps use the SELinux file label
"app_data_file" for files in their /data/data directory. This is
problematic, as we really want different rules for such files. For
example, we may want to allow untrusted apps to load executable code
from priv-app directories, but disallow untrusted apps from loading
executable code from their own home directories.
This change adds a new file type "privapp_data_file". For compatibility,
we adjust the policy to support access privapp_data_files almost
everywhere we were previously granting access to app_data_files
(adbd and run-as being exceptions). Additional future tightening is
possible here by removing some of these newly added rules.
This label will start getting used in a followup change to
system/sepolicy/private/seapp_contexts, similar to:
-user=_app isPrivApp=true domain=priv_app type=app_data_file levelFrom=user
+user=_app isPrivApp=true domain=priv_app type=privapp_data_file levelFrom=user
For now, this newly introduced label has no usage, so this change
is essentially a no-op.
Test: Factory reset and boot - no problems on fresh install.
Test: Upgrade to new version and test. No compatibility problems on
filesystem upgrade.
Change-Id: I9618b7d91d1c2bcb5837cdabc949f0cf741a2837
124 lines
4.1 KiB
Text
124 lines
4.1 KiB
Text
# surfaceflinger - display compositor service
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typeattribute surfaceflinger coredomain;
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type surfaceflinger_exec, exec_type, file_type;
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init_daemon_domain(surfaceflinger)
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typeattribute surfaceflinger mlstrustedsubject;
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typeattribute surfaceflinger display_service_server;
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read_runtime_log_tags(surfaceflinger)
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# Perform HwBinder IPC.
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hal_client_domain(surfaceflinger, hal_graphics_allocator)
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hal_client_domain(surfaceflinger, hal_graphics_composer)
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hal_client_domain(surfaceflinger, hal_omx)
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hal_client_domain(surfaceflinger, hal_configstore)
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hal_client_domain(surfaceflinger, hal_power)
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allow surfaceflinger hidl_token_hwservice:hwservice_manager find;
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# Perform Binder IPC.
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binder_use(surfaceflinger)
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binder_call(surfaceflinger, binderservicedomain)
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binder_call(surfaceflinger, appdomain)
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binder_call(surfaceflinger, bootanim)
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binder_service(surfaceflinger)
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# Binder IPC to bu, presently runs in adbd domain.
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binder_call(surfaceflinger, adbd)
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# Read /proc/pid files for Binder clients.
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r_dir_file(surfaceflinger, binderservicedomain)
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r_dir_file(surfaceflinger, appdomain)
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# Access the GPU.
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allow surfaceflinger gpu_device:chr_file rw_file_perms;
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# Access /dev/graphics/fb0.
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allow surfaceflinger graphics_device:dir search;
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allow surfaceflinger graphics_device:chr_file rw_file_perms;
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# Access /dev/video1.
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allow surfaceflinger video_device:dir r_dir_perms;
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allow surfaceflinger video_device:chr_file rw_file_perms;
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# Create and use netlink kobject uevent sockets.
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allow surfaceflinger self:netlink_kobject_uevent_socket create_socket_perms_no_ioctl;
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# Set properties.
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set_prop(surfaceflinger, system_prop)
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set_prop(surfaceflinger, exported_system_prop)
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set_prop(surfaceflinger, exported2_system_prop)
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set_prop(surfaceflinger, exported3_system_prop)
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set_prop(surfaceflinger, ctl_bootanim_prop)
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# Use open files supplied by an app.
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allow surfaceflinger appdomain:fd use;
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allow surfaceflinger { app_data_file privapp_data_file }:file { read write };
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# Allow writing surface traces to /data/misc/wmtrace.
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userdebug_or_eng(`
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allow surfaceflinger wm_trace_data_file:dir rw_dir_perms;
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allow surfaceflinger wm_trace_data_file:file { getattr setattr create w_file_perms };
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')
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# Use socket supplied by adbd, for cmd gpu vkjson etc.
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allow surfaceflinger adbd:unix_stream_socket { read write getattr };
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# Allow a dumpstate triggered screenshot
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binder_call(surfaceflinger, dumpstate)
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binder_call(surfaceflinger, shell)
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r_dir_file(surfaceflinger, dumpstate)
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# Needed on some devices for playing DRM protected content,
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# but seems expected and appropriate for all devices.
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allow surfaceflinger tee_device:chr_file rw_file_perms;
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# media.player service
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add_service(surfaceflinger, gpu_service)
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# do not use add_service() as hal_graphics_composer_default may be the
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# provider as well
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#add_service(surfaceflinger, surfaceflinger_service)
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allow surfaceflinger surfaceflinger_service:service_manager { add find };
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add_service(surfaceflinger, vrflinger_vsync_service)
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allow surfaceflinger mediaserver_service:service_manager find;
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allow surfaceflinger permission_service:service_manager find;
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allow surfaceflinger power_service:service_manager find;
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allow surfaceflinger vr_manager_service:service_manager find;
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allow surfaceflinger window_service:service_manager find;
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# allow self to set SCHED_FIFO
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allow surfaceflinger self:global_capability_class_set sys_nice;
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allow surfaceflinger proc_meminfo:file r_file_perms;
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r_dir_file(surfaceflinger, cgroup)
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r_dir_file(surfaceflinger, system_file)
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allow surfaceflinger tmpfs:dir r_dir_perms;
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allow surfaceflinger system_server:fd use;
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allow surfaceflinger ion_device:chr_file r_file_perms;
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# pdx IPC
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pdx_server(surfaceflinger, display_client)
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pdx_server(surfaceflinger, display_manager)
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pdx_server(surfaceflinger, display_screenshot)
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pdx_server(surfaceflinger, display_vsync)
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pdx_client(surfaceflinger, bufferhub_client)
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pdx_client(surfaceflinger, performance_client)
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###
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### Neverallow rules
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###
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### surfaceflinger should NEVER do any of this
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# Do not allow accessing SDcard files as unsafe ejection could
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# cause the kernel to kill the process.
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neverallow surfaceflinger sdcard_type:file rw_file_perms;
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# b/68864350
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dontaudit surfaceflinger unlabeled:dir search;
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