5423db6eb3
These APIs expose sensitive information via timing side channels. This leaves access via the adb shell intact along with the current uses by dumpstate, init and system_server. The /proc/interrupts and /proc/stat files were covered in this paper: https://www.lightbluetouchpaper.org/2016/07/29/yet-another-android-side-channel/ The /proc/softirqs, /proc/timer_list and /proc/timer_stats files are also relevant. Access to /proc has been greatly restricted since then, with untrusted apps no longer having direct access to these, but stricter restrictions beyond that would be quite useful. Change-Id: Ibed16674856569d26517e5729f0f194b830cfedd
146 lines
4.8 KiB
Text
146 lines
4.8 KiB
Text
# dumpstate
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type dumpstate, domain, domain_deprecated, mlstrustedsubject;
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type dumpstate_exec, exec_type, file_type;
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init_daemon_domain(dumpstate)
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net_domain(dumpstate)
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binder_use(dumpstate)
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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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allow dumpstate self:capability { setuid setgid sys_resource };
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# Allow dumpstate to scan through /proc/pid for all processes
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r_dir_file(dumpstate, domain)
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allow dumpstate self:capability {
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# Send signals to processes
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kill
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# Run iptables
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net_raw
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net_admin
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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 dumpstate system_file:file execute_no_trans;
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allow dumpstate toolbox_exec:file rx_file_perms;
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# Create and write into /data/anr/
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allow dumpstate self:capability { dac_override chown fowner fsetid };
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allow dumpstate anr_data_file:dir rw_dir_perms;
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allow dumpstate anr_data_file:file create_file_perms;
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# Allow reading /data/system/uiderrors.txt
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# TODO: scope this down.
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allow dumpstate system_data_file:file r_file_perms;
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# Read dmesg
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allow dumpstate self:capability2 syslog;
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allow dumpstate kernel:system syslog_read;
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# Read /sys/fs/pstore/console-ramoops
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allow dumpstate pstorefs:dir r_dir_perms;
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allow dumpstate pstorefs:file r_file_perms;
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# Get process attributes
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allow dumpstate domain:process getattr;
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# Signal java processes to dump their stack
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allow dumpstate { appdomain system_server }:process signal;
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# Signal native processes to dump their stack.
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# This list comes from native_processes_to_dump in dumpstate/utils.c
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allow dumpstate { drmserver mediaserver sdcardd surfaceflinger }:process signal;
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# Ask debuggerd for the backtraces of these processes.
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allow dumpstate { drmserver mediaserver sdcardd surfaceflinger }:debuggerd dump_backtrace;
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# Execute and transition to the vdc domain
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domain_auto_trans(dumpstate, vdc_exec, vdc)
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# Vibrate the device after we're done collecting the bugreport
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# /sys/class/timed_output/vibrator/enable
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# TODO: create a new file class, instead of allowing write access to all of /sys
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allow dumpstate sysfs:file w_file_perms;
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# Other random bits of data we want to collect
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allow dumpstate qtaguid_proc:file r_file_perms;
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allow dumpstate debugfs:file r_file_perms;
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# df for /storage/emulated needs search
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allow dumpstate { storage_file block_device }:dir { search getattr };
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allow dumpstate fuse_device:chr_file getattr;
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allow dumpstate { dm_device cache_block_device }:blk_file getattr;
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# Allow dumpstate to make binder calls to any binder service
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binder_call(dumpstate, binderservicedomain)
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binder_call(dumpstate, appdomain)
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# Reading /proc/PID/maps of other processes
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allow dumpstate self:capability sys_ptrace;
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# Allow the bugreport service to create a file in
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# /data/data/com.android.shell/files/bugreports/bugreport
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allow dumpstate shell_data_file:dir create_dir_perms;
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allow dumpstate shell_data_file:file create_file_perms;
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# Run a shell.
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allow dumpstate shell_exec:file rx_file_perms;
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# For running am and similar framework commands.
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# Run /system/bin/app_process.
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allow dumpstate zygote_exec:file rx_file_perms;
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# Dalvik Compiler JIT.
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allow dumpstate ashmem_device:chr_file execute;
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allow dumpstate dumpstate_tmpfs:file execute;
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allow dumpstate self:process execmem;
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# For art.
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allow dumpstate dalvikcache_data_file:file execute;
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allow dumpstate dalvikcache_data_file:lnk_file r_file_perms;
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# Dumpstate calls screencap, which grabs a screenshot. Needs gpu access
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allow dumpstate gpu_device:chr_file rw_file_perms;
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# logd access
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read_logd(dumpstate)
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control_logd(dumpstate)
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# Read network state info files.
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allow dumpstate net_data_file:dir search;
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allow dumpstate net_data_file:file r_file_perms;
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# Access /data/tombstones.
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allow dumpstate tombstone_data_file:dir r_dir_perms;
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allow dumpstate tombstone_data_file:file r_file_perms;
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# Access /cache/recovery
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allow dumpstate cache_recovery_file:dir r_dir_perms;
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allow dumpstate cache_recovery_file:file r_file_perms;
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# Access /data/misc/recovery
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allow dumpstate recovery_data_file:dir r_dir_perms;
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allow dumpstate recovery_data_file:file r_file_perms;
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# Access /data/misc/logd
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userdebug_or_eng(`
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allow dumpstate misc_logd_file:dir r_dir_perms;
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allow dumpstate misc_logd_file:file r_file_perms;
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')
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allow dumpstate { service_manager_type -gatekeeper_service }:service_manager find;
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allow dumpstate servicemanager:service_manager list;
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allow dumpstate devpts:chr_file rw_file_perms;
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# Set properties.
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# dumpstate_prop is used to share state with the Shell app.
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set_prop(dumpstate, dumpstate_prop)
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# systrace support - allow atrace to run
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allow dumpstate debugfs_tracing:dir r_dir_perms;
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allow dumpstate debugfs_tracing:file rw_file_perms;
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allow dumpstate debugfs_trace_marker:file getattr;
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allow dumpstate atrace_exec:file rx_file_perms;
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allow dumpstate proc_interrupts:file r_file_perms;
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