ef1a64e231
During preloading resources, zygote scans the overlay directories of
supported partitions looking for android RROs to apply statically. Zygote
currently is allowed to read overlays in /oem/overlay, but zygote does
not have the search permission to be able to scan /oem.
Without this patch, this denial is logged:
04-04 14:57:40.136 876 876 I auditd : type=1400 audit(0.0:9):
avc: denied { search } for comm="main" name="oem" dev="dm-3" ino=46
scontext=u:r:zygote:s0 tcontext=u:object_r:oemfs:s0 tclass=dir
permissive=0
Bug: 121033532
Test: booting without denials and stat oem succeeds
Change-Id: I661f3e0aff7ec3513870d08ddc122fc359b8f995
176 lines
6.1 KiB
Text
176 lines
6.1 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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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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# Allow zygote to create JIT memory.
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allow zygote self:process execmem;
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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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# 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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# TODO: reduce this back to only sdcardfs once b/123533205 is root-caused
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# (Technically "sdcardfs" and "media_rw_data_file" are equivalent, since
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# sdcardfs simply wraps files stored under /data/media.)
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allow zygote { sdcard_type media_rw_data_file }:dir { create_dir_perms mounton };
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allow zygote { sdcard_type media_rw_data_file }: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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###
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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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