d6c5ff5f72
If kernel is built with CONFIG_TRANSPARENT_HUGEPAGE optimization,
libjemalloc5 will attempt to read
/sys/kernel/mm/transparent_hugepage/enabled and hit an SELinux denial.
Various denials similiar to the following are seen on cuttlefish:
avc: denied { open } for comm="surfaceflinger"
path="/sys/kernel/mm/transparent_hugepage/enabled" dev="sysfs" ino=776
scontext=u:r:surfaceflinger:s0 tcontext=u:object_r:sysfs:s0 tclass=file
permissive=1
Bug: 28053261
Test: boot cuttlefish without above denials.
Change-Id: Ic33f12d31aacc42d662a8c5c297fbb5f84d4deea
153 lines
6.4 KiB
Text
153 lines
6.4 KiB
Text
###
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### Services with isolatedProcess=true in their manifest.
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###
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### This file defines the rules for isolated apps. An "isolated
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### app" is an APP with UID between AID_ISOLATED_START (99000)
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### and AID_ISOLATED_END (99999).
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###
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typeattribute isolated_app coredomain;
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app_domain(isolated_app)
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# Access already open app data files received over Binder or local socket IPC.
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allow isolated_app { app_data_file privapp_data_file }:file { append read write getattr lock map };
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allow isolated_app activity_service:service_manager find;
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allow isolated_app display_service:service_manager find;
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allow isolated_app webviewupdate_service:service_manager find;
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# Google Breakpad (crash reporter for Chrome) relies on ptrace
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# functionality. Without the ability to ptrace, the crash reporter
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# tool is broken.
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# b/20150694
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# https://code.google.com/p/chromium/issues/detail?id=475270
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allow isolated_app self:process ptrace;
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# b/32896414: Allow accessing sdcard file descriptors passed to isolated_apps
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# by other processes. Open should never be allowed, and is blocked by
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# neverallow rules below.
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# media_rw_data_file is included for sdcardfs, and can be removed if sdcardfs
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# is modified to change the secontext when accessing the lower filesystem.
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allow isolated_app { sdcard_type media_rw_data_file }:file { read write append getattr lock map };
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# For webviews, isolated_app processes can be forked from the webview_zygote
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# in addition to the zygote. Allow access to resources inherited from the
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# webview_zygote process. These rules are specialized copies of the ones in app.te.
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# Inherit FDs from the webview_zygote.
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allow isolated_app webview_zygote:fd use;
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# Notify webview_zygote of child death.
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allow isolated_app webview_zygote:process sigchld;
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# Inherit logd write socket.
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allow isolated_app webview_zygote:unix_dgram_socket write;
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# Read system properties managed by webview_zygote.
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allow isolated_app webview_zygote_tmpfs:file read;
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# Inherit FDs from the app_zygote.
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allow isolated_app app_zygote:fd use;
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# Notify app_zygote of child death.
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allow isolated_app app_zygote:process sigchld;
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# Inherit logd write socket.
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allow isolated_app app_zygote:unix_dgram_socket write;
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# TODO (b/63631799) fix this access
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# suppress denials to /data/local/tmp
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dontaudit isolated_app shell_data_file:dir search;
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# Write app-specific trace data to the Perfetto traced damon. This requires
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# connecting to its producer socket and obtaining a (per-process) tmpfs fd.
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allow isolated_app traced:fd use;
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allow isolated_app traced_tmpfs:file { read write getattr map };
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unix_socket_connect(isolated_app, traced_producer, traced)
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# Allow heap profiling if the main app has been marked as profileable or
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# debuggable.
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can_profile_heap(isolated_app)
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allow isolated_app ashmem_device:chr_file { getattr read ioctl lock map append write };
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#####
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##### Neverallow
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#####
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# Isolated apps should not directly open app data files themselves.
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neverallow isolated_app { app_data_file privapp_data_file }:file open;
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# Only allow appending to /data/anr/traces.txt (b/27853304, b/18340553)
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# TODO: are there situations where isolated_apps write to this file?
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# TODO: should we tighten these restrictions further?
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neverallow isolated_app anr_data_file:file ~{ open append };
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neverallow isolated_app anr_data_file:dir ~search;
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# Isolated apps must not be permitted to use HwBinder
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neverallow isolated_app hwbinder_device:chr_file *;
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neverallow isolated_app *:hwservice_manager *;
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# Isolated apps must not be permitted to use VndBinder
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neverallow isolated_app vndbinder_device:chr_file *;
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# Isolated apps must not be permitted to perform actions on Binder and VndBinder service_manager
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# except the find actions for services whitelisted below.
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neverallow isolated_app *:service_manager ~find;
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# b/17487348
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# Isolated apps can only access three services,
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# activity_service, display_service, webviewupdate_service, and
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# ashmem_device_service.
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neverallow isolated_app {
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service_manager_type
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-activity_service
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-ashmem_device_service
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-display_service
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-webviewupdate_service
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}:service_manager find;
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# Isolated apps shouldn't be able to access the driver directly.
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neverallow isolated_app gpu_device:chr_file { rw_file_perms execute };
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# Do not allow isolated_app access to /cache
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neverallow isolated_app cache_file:dir ~{ r_dir_perms };
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neverallow isolated_app cache_file:file ~{ read getattr };
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# Do not allow isolated_app to access external storage, except for files passed
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# via file descriptors (b/32896414).
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neverallow isolated_app { storage_file mnt_user_file sdcard_type }:dir ~getattr;
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neverallow isolated_app { storage_file mnt_user_file }:file_class_set *;
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neverallow isolated_app sdcard_type:{ devfile_class_set lnk_file sock_file fifo_file } *;
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neverallow isolated_app sdcard_type:file ~{ read write append getattr lock map };
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# Do not allow USB access
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neverallow isolated_app { usb_device usbaccessory_device }:chr_file *;
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# Restrict the webview_zygote control socket.
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neverallow isolated_app webview_zygote:sock_file write;
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# Limit the /sys files which isolated_app can access. This is important
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# for controlling isolated_app attack surface.
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neverallow isolated_app {
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sysfs_type
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-sysfs_devices_system_cpu
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-sysfs_transparent_hugepage
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-sysfs_usb # TODO: check with audio team if needed for isolated_app (b/28417852)
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}:file no_rw_file_perms;
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# No creation of sockets families other than AF_UNIX sockets.
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# List taken from system/sepolicy/public/global_macros - socket_class_set
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# excluding unix_stream_socket and unix_dgram_socket.
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# Many of these are socket families which have never and will never
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# be compiled into the Android kernel.
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neverallow isolated_app self:{
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socket tcp_socket udp_socket rawip_socket netlink_socket packet_socket
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key_socket appletalk_socket netlink_route_socket
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netlink_tcpdiag_socket netlink_nflog_socket netlink_xfrm_socket
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netlink_selinux_socket netlink_audit_socket netlink_dnrt_socket
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netlink_kobject_uevent_socket tun_socket netlink_iscsi_socket
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netlink_fib_lookup_socket netlink_connector_socket netlink_netfilter_socket
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netlink_generic_socket netlink_scsitransport_socket netlink_rdma_socket
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netlink_crypto_socket sctp_socket icmp_socket ax25_socket ipx_socket
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netrom_socket atmpvc_socket x25_socket rose_socket decnet_socket atmsvc_socket
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rds_socket irda_socket pppox_socket llc_socket can_socket tipc_socket
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bluetooth_socket iucv_socket rxrpc_socket isdn_socket phonet_socket
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ieee802154_socket caif_socket alg_socket nfc_socket vsock_socket kcm_socket
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qipcrtr_socket smc_socket xdp_socket
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} create;
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