SEPolicy: Changes for new stack dumping scheme. am: e628cb5b2d

am: 5e8fe8348b

Change-Id: Ibfe717b42fc26da2ec7876143b8cf0445a20eaec

private/app.te

@@ -109,10 +109,22 @@ allow appdomain shortcut_manager_icons:file { getattr read };
 # Read icon file (opened by system).
 allow appdomain icon_file:file { getattr read };
 
-# Write to /data/anr/traces.txt.
+# Old stack dumping scheme : append to a global trace file (/data/anr/traces.txt).
+#
+# TODO: All of these permissions except for anr_data_file:file append can be
+# withdrawn once we've switched to the new stack dumping mechanism, see b/32064548
+# and the rules below.
 allow appdomain anr_data_file:dir search;
 allow appdomain anr_data_file:file { open append };
 
+# New stack dumping scheme : request an output FD from tombstoned via a unix
+# domain socket.
+#
+# Allow apps to connect and write to the tombstoned java trace socket in
+# order to dump their traces.
+unix_socket_connect(appdomain, tombstoned_java_trace, tombstoned)
+allow appdomain tombstoned:fd use;
+
 # Allow apps to send dump information to dumpstate
 allow appdomain dumpstate:fd use;
 allow appdomain dumpstate:unix_stream_socket { read write getopt getattr shutdown };

private/file_contexts

@@ -146,6 +146,7 @@
 /dev/socket/rild	u:object_r:rild_socket:s0
 /dev/socket/rild-debug	u:object_r:rild_debug_socket:s0
 /dev/socket/tombstoned_crash u:object_r:tombstoned_crash_socket:s0
+/dev/socket/tombstoned_java_trace u:object_r:tombstoned_java_trace_socket:s0
 /dev/socket/tombstoned_intercept u:object_r:tombstoned_intercept_socket:s0
 /dev/socket/uncrypt	u:object_r:uncrypt_socket:s0
 /dev/socket/vold	u:object_r:vold_socket:s0

private/system_server.te

@@ -300,9 +300,22 @@ allow system_server asec_apk_file:file create_file_perms;
 allow system_server asec_public_file:file create_file_perms;
 
 # Manage /data/anr.
+#
+# TODO: Some of these permissions can be withdrawn once we've switched to the
+# new stack dumping mechanism, see b/32064548 and the rules below. In particular,
+# the system_server should never need to create a new anr_data_file:file or write
+# to one, but it will still need to read and append to existing files.
 allow system_server anr_data_file:dir create_dir_perms;
 allow system_server anr_data_file:file create_file_perms;
 
+# New stack dumping scheme : request an output FD from tombstoned via a unix
+# domain socket.
+#
+# Allow system_server to connect and write to the tombstoned java trace socket in
+# order to dump its traces.
+unix_socket_connect(system_server, tombstoned_java_trace, tombstoned)
+allow system_server tombstoned:fd use;
+
 # Read /data/misc/incidents - only read. The fd will be sent over binder,
 # with no DAC access to it, for dropbox to read.
 allow system_server incident_data_file:file read;

public/domain.te

@@ -481,14 +481,19 @@ neverallow {
   # Processes that can't exec crash_dump
   -mediacodec
   -mediaextractor
-} tombstoned:unix_stream_socket connectto;
+} tombstoned_crash_socket:unix_stream_socket connectto;
+
 neverallow {
   domain
   -crash_dump
   -mediacodec
   -mediaextractor
 } tombstoned_crash_socket:sock_file write;
+
+# Never allow anyone except dumpstate or the system server to connect or write to
+# the tombstoned intercept socket.
 neverallow { domain -dumpstate -system_server } tombstoned_intercept_socket:sock_file write;
+neverallow { domain -dumpstate -system_server } tombstoned_intercept_socket:unix_stream_socket connectto;
 
 # Android does not support System V IPCs.
 #

public/file.te

@@ -243,6 +243,7 @@ type rild_debug_socket, file_type;
 type system_wpa_socket, file_type;
 type system_ndebug_socket, file_type, mlstrustedobject;
 type tombstoned_crash_socket, file_type, mlstrustedobject;
+type tombstoned_java_trace_socket, file_type, mlstrustedobject;
 type tombstoned_intercept_socket, file_type;
 type uncrypt_socket, file_type;
 type vold_socket, file_type;

public/tombstoned.te

@@ -10,8 +10,13 @@ allow tombstoned domain:dir r_dir_perms;
 allow tombstoned domain:file r_file_perms;
 allow tombstoned tombstone_data_file:dir rw_dir_perms;
 allow tombstoned tombstone_data_file:file create_file_perms;
-allow tombstoned anr_data_file:file { getattr append };
 
-# TODO: Find out why this is happening.
-allow tombstoned anr_data_file:file write;
-auditallow tombstoned anr_data_file:file write;
+# TODO: Remove append / write permissions. They were temporarily
+# granted due to a bug which appears to have been fixed.
+allow tombstoned anr_data_file:file { append write };
+auditallow tombstoned anr_data_file:file { append write };
+
+# Changes for the new stack dumping mechanism. Each trace goes into a
+# separate file, and these files are managed by tombstoned.
+allow tombstoned anr_data_file:dir rw_dir_perms;
+allow tombstoned anr_data_file:file { getattr open create };