Add sepolicy for simpleperf_boot.

simpleperf_boot is the secontext used to run simpleperf from init,
to generate boot-time profiles.

Bug: 214731005
Test: run simpleperf manually
Change-Id: I6f37515681f4963faf84cb1059a8d5845c2fe5a5

private/coredomain.te

@@ -76,6 +76,7 @@ full_treble_only(`
         userdebug_or_eng(`-profcollectd')
         -postinstall_dexopt
         -rs # spawned by appdomain, so carryover the exception above
+        userdebug_or_eng(`-simpleperf_boot')
         -system_server
         -traced_perf
         -mediaserver
@@ -121,6 +122,7 @@ full_treble_only(`
         -zygote
         -heapprofd
         userdebug_or_eng(`-profcollectd')
+        userdebug_or_eng(`-simpleperf_boot')
     } vendor_overlay_file:file open;
 ')
 
@@ -176,6 +178,7 @@ full_treble_only(`
     -system_server
     -traceur_app
     userdebug_or_eng(`-profcollectd')
+    userdebug_or_eng(`-simpleperf_boot')
   } debugfs_tracing:file no_rw_file_perms;
 
   # inotifyfs

private/domain.te

@@ -121,6 +121,7 @@ neverallow {
   -dumpstate
   userdebug_or_eng(`-incidentd')
   userdebug_or_eng(`-profcollectd')
+  userdebug_or_eng(`-simpleperf_boot')
   -storaged
   -system_server
 } self:global_capability_class_set sys_ptrace;
@@ -456,6 +457,7 @@ full_treble_only(`
     -iorap_inode2filename
     -iorap_prefetcherd
     -kernel
+    userdebug_or_eng(`-simpleperf_boot')
     -traced_perf
     -ueventd
   } vendor_file:file { no_w_file_perms no_x_file_perms open };
@@ -496,6 +498,7 @@ full_treble_only(`
     -heapprofd
     userdebug_or_eng(`-profcollectd')
     -shell
+    userdebug_or_eng(`-simpleperf_boot')
     -system_executes_vendor_violators
     -traced_perf # library/binary access for symbolization
     -ueventd # reads /vendor/ueventd.rc
@@ -547,6 +550,7 @@ neverallow {
   -init
   userdebug_or_eng(`-profcollectd')
   -vendor_init
+  userdebug_or_eng(`-simpleperf_boot')
   -traced_probes
   -traced_perf
 } proc_kallsyms:file { open read };

private/property.te

@@ -557,6 +557,7 @@ neverallow {
   domain
   -init
   userdebug_or_eng(`-profcollectd')
+  userdebug_or_eng(`-simpleperf_boot')
   userdebug_or_eng(`-traced_probes')
   userdebug_or_eng(`-traced_perf')
 } {

private/simpleperf_boot.te

@@ -0,0 +1,59 @@
+# Domain used when running /system/bin/simpleperf to record boot-time profiles.
+# It is started by init process. It's only available on userdebug/eng build.
+
+type simpleperf_boot, domain, coredomain, mlstrustedsubject;
+
+# /data/simpleperf_boot_data, used to store boot-time profiles.
+type simpleperf_boot_data_file, file_type;
+
+userdebug_or_eng(`
+  domain_auto_trans(init, simpleperf_exec, simpleperf_boot)
+
+  # simpleperf_boot writes profile data to /data/simpleperf_boot_data.
+  allow simpleperf_boot simpleperf_boot_data_file:file create_file_perms;
+  allow simpleperf_boot simpleperf_boot_data_file:dir rw_dir_perms;
+
+  # Allow simpleperf_boot full use of perf_event_open(2), to enable system wide profiling.
+  allow simpleperf_boot self:perf_event { cpu kernel open read write };
+  allow simpleperf_boot self:global_capability2_class_set perfmon;
+
+  # Allow simpleperf_boot to scan through /proc/pid for all processes.
+  r_dir_file(simpleperf_boot, domain)
+
+  # Allow simpleperf_boot to read executable binaries.
+  allow simpleperf_boot system_file_type:file r_file_perms;
+  allow simpleperf_boot vendor_file_type:file r_file_perms;
+
+  # Allow simpleperf_boot to search for and read kernel modules.
+  allow simpleperf_boot vendor_file:dir r_dir_perms;
+  allow simpleperf_boot vendor_kernel_modules:file r_file_perms;
+
+  # Allow simpleperf_boot to read system bootstrap libs.
+  allow simpleperf_boot system_bootstrap_lib_file:dir search;
+  allow simpleperf_boot system_bootstrap_lib_file:file r_file_perms;
+
+  # Allow simpleperf_boot to access tracefs.
+  allow simpleperf_boot debugfs_tracing:dir r_dir_perms;
+  allow simpleperf_boot debugfs_tracing:file rw_file_perms;
+  allow simpleperf_boot debugfs_tracing_debug:dir r_dir_perms;
+  allow simpleperf_boot debugfs_tracing_debug:file rw_file_perms;
+
+  # Allow simpleperf_boot to write to perf_event_paranoid under /proc.
+  allow simpleperf_boot proc_perf:file write;
+
+  # Allow simpleperf_boot to read process maps.
+  allow simpleperf_boot self:global_capability_class_set sys_ptrace;
+  # Allow simpleperf_boot to read JIT debug info from system_server and zygote.
+  allow simpleperf_boot { system_server zygote }:process ptrace;
+
+  # Allow to temporarily lift the kptr_restrict setting and get kernel start address
+  # by reading /proc/kallsyms, get module start address by reading /proc/modules.
+  set_prop(simpleperf_boot, lower_kptr_restrict_prop)
+  allow simpleperf_boot proc_kallsyms:file r_file_perms;
+  allow simpleperf_boot proc_modules:file r_file_perms;
+
+  # Allow simpleperf_boot to read kernel build id.
+  allow simpleperf_boot sysfs_kernel_notes:file r_file_perms;
+
+  dontaudit simpleperf_boot shell_data_file:dir search;
+')