9b2e0cbeea
In kernel 4.7, the capability and capability2 classes were split apart
from cap_userns and cap2_userns (see kernel commit
8e4ff6f228e4722cac74db716e308d1da33d744f). Since then, Android cannot be
run in a container with SELinux in enforcing mode.
This change applies the existing capability rules to user namespaces as
well as the root namespace so that Android running in a container
behaves the same on pre- and post-4.7 kernels.
This is essentially:
1. New global_capability_class_set and global_capability2_class_set
that match capability+cap_userns and capability2+cap2_userns,
respectively.
2. s/self:capability/self:global_capability_class_set/g
3. s/self:capability2/self:global_capability2_class_set/g
4. Add cap_userns and cap2_userns to the existing capability_class_set
so that it covers all capabilities. This set was used by several
neverallow and dontaudit rules, and I confirmed that the new
classes are still appropriate.
Test: diff new policy against old and confirm that all new rules add
only cap_userns or cap2_userns;
Boot ARC++ on a device with the 4.12 kernel.
Bug: crbug.com/754831
Change-Id: I4007eb3a2ecd01b062c4c78d9afee71c530df95f
110 lines
3.3 KiB
Text
110 lines
3.3 KiB
Text
typeattribute incidentd coredomain;
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init_daemon_domain(incidentd)
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type incidentd_exec, exec_type, file_type;
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binder_use(incidentd)
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wakelock_use(incidentd)
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# Allow setting process priority, protect from OOM killer, and dropping
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# privileges by switching UID / GID
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# TODO allow incidentd self:global_capability_class_set { setuid setgid sys_resource };
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# Allow incidentd to scan through /proc/pid for all processes
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r_dir_file(incidentd, domain)
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allow incidentd self:global_capability_class_set {
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# Send signals to processes
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kill
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};
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# Allow executing files on system, such as:
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# /system/bin/toolbox
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# /system/bin/logcat
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# /system/bin/dumpsys
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allow incidentd system_file:file execute_no_trans;
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allow incidentd toolbox_exec:file rx_file_perms;
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# Create and write into /data/misc/incidents
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allow incidentd incident_data_file:dir rw_dir_perms;
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allow incidentd incident_data_file:file create_file_perms;
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# Get process attributes
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# TODO allow incidentd domain:process getattr;
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# Signal java processes to dump their stack and get the results
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# TODO allow incidentd { appdomain ephemeral_app system_server }:process signal;
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# TODO allow incidentd anr_data_file:dir rw_dir_perms;
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# TODO allow incidentd anr_data_file:file create_file_perms;
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# Signal native processes to dump their stack.
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# This list comes from native_processes_to_dump in incidentd/utils.c
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allow incidentd {
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audioserver
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cameraserver
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drmserver
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inputflinger
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mediacodec
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mediadrmserver
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mediaextractor
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mediaserver
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sdcardd
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surfaceflinger
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}:process signal;
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# Allow incidentd to make binder calls to any binder service
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binder_call(incidentd, binderservicedomain)
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binder_call(incidentd, appdomain)
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# Reading /proc/PID/maps of other processes
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# TODO allow incidentd self:global_capability_class_set sys_ptrace;
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# Run a shell.
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allow incidentd shell_exec:file rx_file_perms;
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# logd access - work to be done is a PII safe log (possibly an event log?)
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# TODO read_logd(incidentd)
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# TODO control_logd(incidentd)
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# Allow incidentd to find these standard groups of services.
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# Others can be whitelisted individually.
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allow incidentd {
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system_server_service
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app_api_service
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system_api_service
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}:service_manager find;
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# Only incidentd can publish the binder service
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add_service(incidentd, incident_service)
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# Allow pipes from (and only from) incident
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allow incidentd incident:fd use;
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allow incidentd incident:fifo_file write;
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# Allow incident to call back to incident with status updates.
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binder_call(incidentd, incident)
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###
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### neverallow rules
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###
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# only system_server, system_app and incident command can find the incident service
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neverallow { domain -system_server -system_app -incident -incidentd } incident_service:service_manager find;
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# only incidentd and the other root services in limited circumstances
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# can get to the files in /data/misc/incidents
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#
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# write, execute, append are forbidden almost everywhere
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neverallow { domain -incidentd -init -vold } incident_data_file:file {
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w_file_perms
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x_file_perms
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create
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rename
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setattr
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unlink
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append
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};
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# read is also allowed by system_server, for when the file is handed to dropbox
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neverallow { domain -incidentd -init -vold -system_server } incident_data_file:file r_file_perms;
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# limited access to the directory itself
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neverallow { domain -incidentd -init -vold } incident_data_file:dir create_dir_perms;
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