Merge "Start using virtmgr for running VMs" am: 2cfd7d5e4b am: 2de678977a

Original change: https://android-review.googlesource.com/c/platform/system/sepolicy/+/2367809

Change-Id: I8e3305438b002a4a4963c71dbbacfe56728d4a04
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>

apex/com.android.virt-file_contexts

@@ -1,5 +1,5 @@
 (/.*)?                     u:object_r:system_file:s0
 /bin/crosvm                u:object_r:crosvm_exec:s0
 /bin/fd_server             u:object_r:fd_server_exec:s0
-/bin/virtmgr               u:object_r:virtmgr_exec:s0
+/bin/virtmgr               u:object_r:virtualizationmanager_exec:s0
 /bin/virtualizationservice u:object_r:virtualizationservice_exec:s0

private/app.te

@@ -95,9 +95,9 @@ neverallow appdomain system_server:udp_socket {
 # Exception for crash_dump to allow for app crash reporting.
 # Exception for renderscript binaries (/system/bin/bcc, /system/bin/ld.mc)
 # to allow renderscript to create privileged executable files.
-# Exception for virtmgr to allow running VMs as child processes.
+# Exception for virtualizationmanager to allow running VMs as child processes.
 neverallow { appdomain -shell userdebug_or_eng(`-su') }
-    { domain -appdomain -crash_dump -rs -virtmgr }:process { transition };
+    { domain -appdomain -crash_dump -rs -virtualizationmanager }:process { transition };
 neverallow { appdomain -shell userdebug_or_eng(`-su') }
     { domain -appdomain }:process { dyntransition };
 

private/crosvm.te

@@ -14,10 +14,10 @@ neverallowxperm { domain -crosvm } kvm_device:chr_file ioctl ~{ KVM_CHECK_EXTENS
 tmpfs_domain(crosvm)
 
 # Let crosvm receive file descriptors from VirtualizationService.
-allow crosvm virtualizationservice:fd use;
+allow crosvm virtualizationmanager:fd use;
 
 # Allow sending VirtualizationService the failure reason from the VM via pipe.
-allow crosvm virtualizationservice:fifo_file write;
+allow crosvm virtualizationmanager:fifo_file write;
 
 # Let crosvm read the composite disk images (virtualizationservice_data_file), APEXes
 # (staging_data_file), APKs (apk_data_file and shell_data_file where the latter is for test apks in
@@ -36,11 +36,14 @@ allow crosvm {
 # Allow searching the directory where the composite disk images are.
 allow crosvm virtualizationservice_data_file:dir search;
 
+# Allow crosvm to mlock guest memory.
+allow crosvm self:capability ipc_lock;
+
 # Let crosvm access its control socket as created by VS.
 #   read, write, getattr: listener socket polling
 #   accept: listener socket accepting new connection
 # Note that the open permission is not given as the socket is passed by FD.
-allow crosvm virtualizationservice:unix_stream_socket { accept read write getattr getopt };
+allow crosvm virtualizationmanager:unix_stream_socket { accept read write getattr getopt };
 
 # Let crosvm open test artifacts under /data/local/tmp with file path. (e.g. custom pvmfw.img)
 userdebug_or_eng(`
@@ -110,9 +113,9 @@ neverallow crosvm {
   -shell_data_file
 }:file read;
 
-# Only virtualizationservice can run crosvm
+# Only virtualizationmanager can run crosvm
 neverallow {
   domain
   -crosvm
-  -virtualizationservice
+  -virtualizationmanager
 } crosvm_exec:file no_x_file_perms;

private/domain.te

@@ -290,7 +290,7 @@ neverallow {
   -apexd
   -installd
   -priv_app
-  -virtualizationservice
+  -virtualizationmanager
 } staging_data_file:dir *;
 neverallow {
   domain
@@ -303,7 +303,7 @@ neverallow {
   -installd
   -priv_app
   -shell
-  -virtualizationservice
+  -virtualizationmanager
   -crosvm
 } staging_data_file:file *;
 neverallow { domain -init -system_server -installd} staging_data_file:dir no_w_dir_perms;

private/file.te

@@ -91,7 +91,9 @@ type odsign_data_file, file_type, data_file_type, core_data_file_type;
 type odsign_metrics_file, file_type, data_file_type, core_data_file_type;
 
 # /data/misc/virtualizationservice
-type virtualizationservice_data_file, file_type, data_file_type, core_data_file_type;
+# The type needs to be mlstrustedobject to allow for being accessed from
+# virtualizationmanager, which runs at a more constrained MLS level.
+type virtualizationservice_data_file, file_type, data_file_type, core_data_file_type, mlstrustedobject;
 
 # /data/system/environ
 type environ_system_data_file, file_type, data_file_type, core_data_file_type;
@@ -100,7 +102,9 @@ type environ_system_data_file, file_type, data_file_type, core_data_file_type;
 type bootanim_data_file, file_type, data_file_type, core_data_file_type;
 
 # /dev/kvm
-type kvm_device, dev_type;
+# The type needs to be mlstrustedobject to allow for being accessed from
+# crosvm, which runs at a more constrained MLS level.
+type kvm_device, dev_type, mlstrustedobject;
 
 # /apex/com.android.virt/bin/fd_server
 type fd_server_exec, system_file_type, exec_type, file_type;

private/su.te

@@ -19,6 +19,9 @@ userdebug_or_eng(`
   # Put the perfetto command into its domain so it is the same on user, userdebug and eng.
   domain_auto_trans(su, perfetto_exec, perfetto)
 
+  # Put the virtmgr command into its domain.
+  domain_auto_trans(su, virtualizationmanager_exec, virtualizationmanager)
+
   # su is also permissive to permit setenforce.
   permissive su;
 

private/virtmgr.te

@@ -1,8 +0,0 @@
-# Domain for a child process that manages virtual machines on behalf of its parent.
-
-type virtmgr, domain, coredomain;
-type virtmgr_exec, system_file_type, exec_type, file_type;
-
-# Allow virtmgr to communicate use, read and write over the adb connection.
-allow virtmgr adbd:fd use;
-allow virtmgr adbd:unix_stream_socket { read write };

private/virtualizationmanager.te

@@ -0,0 +1,73 @@
+# Domain for a child process that manages virtual machines on behalf of its parent.
+
+type virtualizationmanager, domain, coredomain;
+type virtualizationmanager_exec, system_file_type, exec_type, file_type;
+
+# Allow virtualizationmanager to communicate use, read and write over the adb connection.
+allow virtualizationmanager adbd:fd use;
+allow virtualizationmanager adbd:unix_stream_socket { read write };
+
+# Let the virtualizationmanager domain use Binder.
+binder_use(virtualizationmanager)
+
+# Let virtualizationmanager find and communicate with virtualizationservice.
+allow virtualizationmanager virtualization_service:service_manager find;
+binder_call(virtualizationmanager, virtualizationservice)
+
+# Allow calling into the system server to find native services. "permission_service" to check
+# permissions, and "package_native" for staged apex info.
+binder_call(virtualizationmanager, system_server)
+allow virtualizationmanager { package_native_service permission_service }:service_manager find;
+
+# When virtualizationmanager execs a file with the crosvm_exec label, run it in the crosvm domain.
+domain_auto_trans(virtualizationmanager, crosvm_exec, crosvm)
+
+# Let virtualizationmanager kill crosvm.
+allow virtualizationmanager crosvm:process sigkill;
+
+# Let virtualizationmanager create files inside virtualizationservice's temporary directories.
+allow virtualizationmanager virtualizationservice_data_file:dir rw_dir_perms;
+allow virtualizationmanager virtualizationservice_data_file:{ file sock_file } create_file_perms;
+
+# Let virtualizationmanager read and write files from its various clients, but not open them
+# directly as they must be passed over Binder by the client.
+allow virtualizationmanager apk_data_file:file { getattr read };
+
+# Write access is needed for mutable partitions like instance.img
+allow virtualizationmanager {
+  app_data_file
+  apex_compos_data_file
+  privapp_data_file
+}:file { getattr read write };
+
+# shell_data_file is used for automated tests and manual debugging.
+allow virtualizationmanager shell_data_file:file { getattr read write };
+
+# Allow virtualizationmanager to read apex-info-list.xml and access the APEX files listed there.
+allow virtualizationmanager apex_info_file:file r_file_perms;
+allow virtualizationmanager apex_data_file:dir search;
+allow virtualizationmanager staging_data_file:file r_file_perms;
+allow virtualizationmanager staging_data_file:dir search;
+
+# Run derive_classpath in our domain
+allow virtualizationmanager derive_classpath_exec:file rx_file_perms;
+allow virtualizationmanager apex_mnt_dir:dir r_dir_perms;
+# Ignore harmless denials on /proc/self/fd
+dontaudit virtualizationmanager self:dir write;
+
+# Let virtualizationmanager to accept vsock connection from the guest VMs
+allow virtualizationmanager self:vsock_socket { create_socket_perms_no_ioctl listen accept };
+
+# Allow virtualizationmanager to inspect all hypervisor capabilities.
+get_prop(virtualizationmanager, hypervisor_prop)
+get_prop(virtualizationmanager, hypervisor_restricted_prop)
+
+# Allow virtualizationmanager service to talk to tombstoned to push guest ramdumps
+unix_socket_connect(virtualizationmanager, tombstoned_crash, tombstoned)
+
+# Append ramdumps to tombstone files passed as fds from tombstoned
+allow virtualizationmanager tombstone_data_file:file { append getattr };
+allow virtualizationmanager tombstoned:fd use;
+
+# Allow reading files under /proc/[crosvm pid]/, for collecting CPU & memory usage inside VM.
+r_dir_file(virtualizationmanager, crosvm);

private/virtualizationservice.te

@@ -1,80 +1,45 @@
 type virtualizationservice, domain, coredomain;
 type virtualizationservice_exec, system_file_type, exec_type, file_type;
 
+# The domain needs to be a 'mlstrustedsubject' to change the memlock rlimit of
+# the virtualizationmanager domain running at a more constrained MLS level.
+typeattribute virtualizationservice mlstrustedsubject;
+
 # When init runs a file labelled with virtualizationservice_exec, run it in the
 # virtualizationservice domain.
 init_daemon_domain(virtualizationservice)
 
 # Let the virtualizationservice domain use Binder.
 binder_use(virtualizationservice)
-# ... and host a binder service
-binder_service(virtualizationservice)
-
-# Allow calling into the system server so that it can check permissions.
-binder_call(virtualizationservice, system_server)
-allow virtualizationservice permission_service:service_manager find;
-# Allow virtualizationservice to access "package_native" service for staged apex info.
-allow virtualizationservice package_native_service:service_manager find;
 
 # Let the virtualizationservice domain register the virtualization_service with ServiceManager.
 add_service(virtualizationservice, virtualization_service)
 
-# When virtualizationservice execs a file with the crosvm_exec label, run it in the crosvm domain.
-domain_auto_trans(virtualizationservice, crosvm_exec, crosvm)
-
-# Let virtualizationservice (and specifically its children) mlock VM memory and page tables.
+# Let virtualizationservice remove memlock rlimit of virtualizationmanager. This is necessary
+# to mlock VM memory and page tables.
 allow virtualizationservice self:capability sys_resource;
+allow virtualizationservice virtualizationmanager:process setrlimit;
 
-# Let virtualizationservice kill crosvm.
-allow virtualizationservice crosvm:process sigkill;
+# Let virtualizationservice set the owner of a VM's temporary directory.
+allow virtualizationservice self:capability chown;
 
-# Let virtualizationservice access its data directory.
-allow virtualizationservice virtualizationservice_data_file:file create_file_perms;
+# Let virtualizationservice create and delete temporary directories of VMs. To remove old
+# directories, it needs the permission to unlink the files created by virtualizationmanager.
 allow virtualizationservice virtualizationservice_data_file:dir create_dir_perms;
-
-# Let virtualizationservice manage crosvm control sockets.
-allow virtualizationservice virtualizationservice_data_file:sock_file create_file_perms;
+allow virtualizationservice virtualizationservice_data_file:{ file sock_file } unlink;
 
 # Allow to use fd (e.g. /dev/pts/0) inherited from adbd so that we can redirect output from
 # crosvm to the console
 allow virtualizationservice adbd:fd use;
 allow virtualizationservice adbd:unix_stream_socket { read write };
 
-# Let virtualizationservice read and write files from its various clients, but not open them
-# directly as they must be passed over Binder by the client.
-allow virtualizationservice apk_data_file:file { getattr read };
-# Write access is needed for mutable partitions like instance.img
-allow virtualizationservice {
-  app_data_file
-  apex_compos_data_file
-  privapp_data_file
-}:file { getattr read write };
-
-# shell_data_file is used for automated tests and manual debugging.
-allow virtualizationservice shell_data_file:file { getattr read write };
-
-# Allow virtualizationservice to read apex-info-list.xml and access the APEX files listed there.
-allow virtualizationservice apex_info_file:file r_file_perms;
-allow virtualizationservice apex_data_file:dir search;
-allow virtualizationservice staging_data_file:file r_file_perms;
-allow virtualizationservice staging_data_file:dir search;
-
-# Run derive_classpath in our domain
-allow virtualizationservice derive_classpath_exec:file rx_file_perms;
-allow virtualizationservice apex_mnt_dir:dir r_dir_perms;
-# Ignore harmless denials on /proc/self/fd
-dontaudit virtualizationservice self:dir write;
-
-# Let virtualizationservice to accept vsock connection from the guest VMs
+# Let virtualizationservice to accept vsock connection from the guest VMs to singleton services
+# such as the guest tombstone server.
 allow virtualizationservice self:vsock_socket { create_socket_perms_no_ioctl listen accept };
 
 # Allow virtualizationservice to read/write its own sysprop. Only the process can do so.
 set_prop(virtualizationservice, virtualizationservice_prop)
 
-# Allow virtualizationservice to inspect all hypervisor capabilities.
-get_prop(virtualizationservice, hypervisor_prop)
-get_prop(virtualizationservice, hypervisor_restricted_prop)
-
 # Allow writing stats to statsd
 unix_socket_send(virtualizationservice, statsdw, statsd)
 
@@ -85,9 +50,6 @@ unix_socket_connect(virtualizationservice, tombstoned_crash, tombstoned)
 allow virtualizationservice tombstone_data_file:file { append getattr };
 allow virtualizationservice tombstoned:fd use;
 
-# Allow reading files under /proc/[crosvm pid]/, for collecting CPU & memory usage inside VM.
-r_dir_file(virtualizationservice, crosvm);
-
 neverallow {
   domain
   -init
@@ -97,5 +59,12 @@ neverallow {
 neverallow {
   domain
   -init
+  -virtualizationmanager
   -virtualizationservice
 } virtualizationservice_data_file:file { open create };
+
+neverallow virtualizationservice {
+  domain
+  -virtualizationmanager
+  -virtualizationservice
+}:process setrlimit;

public/te_macros

@@ -183,32 +183,25 @@ neverallow $1 ~$1_userfaultfd:anon_inode *;
 ####################################
 # virtualizationservice_use(domain)
 # Allow domain to create and communicate with a virtual machine using
-# virtualizationservice.
+# virtualizationservice and virtualizationmanager.
 define(`virtualizationservice_use', `
-allow $1 virtualization_service:service_manager find;
-# Let the client call virtualizationservice.
-binder_call($1, virtualizationservice)
-# Let virtualizationservice call back to the client.
-binder_call(virtualizationservice, $1)
-# Transition to virtmgr when the client executes it.
-domain_auto_trans($1, virtmgr_exec, virtmgr)
-# Allow virtmgr to communicate over UDS with the client.
-allow virtmgr $1:unix_stream_socket { getattr read write };
-# Allow virtmgr and the client to signal each other using pipes.
-allow virtmgr $1:fifo_file { getattr read write };
-# Let the client pass file descriptors to virtualizationservice/virtmgr and on
-# to crosvm
-allow { virtualizationservice virtmgr crosvm } $1:fd use;
+# Transition to virtualizationmanager when the client executes it.
+domain_auto_trans($1, virtualizationmanager_exec, virtualizationmanager)
+# Allow virtualizationmanager to communicate over UDS with the client.
+allow { virtualizationmanager crosvm } $1:unix_stream_socket { getattr read write };
+# Let the client pass file descriptors to virtualizationmanager and on to crosvm.
+allow { virtualizationmanager crosvm } $1:fd use;
+# Let the client use file descriptors created by virtualizationmanager.
+allow $1 virtualizationmanager:fd use;
 # Allow piping console log to the client
-allow { virtualizationservice crosvm } $1:fifo_file { getattr write};
-# Allow client to read/write vsock created by virtualizationservice to
-# communicate with the VM that it created. Notice that we do not grant
-# permission to create a vsock; the client can only connect to VMs
-# that it owns.
-allow $1 virtualizationservice:vsock_socket { getattr getopt read write };
+allow { virtualizationmanager crosvm } $1:fifo_file { getattr read write };
+# Allow client to read/write vsock created by virtualizationmanager to communicate with the VM
+# that it created. Notice that we do not grant permission to create a vsock;
+# the client can only connect to VMs that it owns.
+allow $1 virtualizationmanager:vsock_socket { getattr getopt read write };
 # Allow client to inspect hypervisor capabilities
 get_prop($1, hypervisor_prop)
-# Allow client to read (but not open) the crashdump provided by virtualizationservice
+# Allow client to read (but not open) the crashdump provided by virtualizationmanager
 allow $1 virtualizationservice_data_file:file { getattr read };
 ')