crash_dump: disallow ptrace of TCB components

Remove permissions and add neverallow assertion.

Bug: 110107376
Test: kill -6 <components excluded from ptrace>
Change-Id: If8b9c932af03a551e40e786d591544ecdd4e5c98

private/crash_dump.te

 typeattribute crash_dump coredomain;
+
+allow crash_dump {
+  domain
+  -bpfloader
+  -crash_dump
+  -init
+  -kernel
+  -keystore
+  -logd
+  -ueventd
+  -vendor_init
+  -vold
+}:process { ptrace signal sigchld sigstop sigkill };
+
+neverallow crash_dump {
+  bpfloader
+  init
+  kernel
+  keystore
+  logd
+  userdebug_or_eng(`-logd')
+  ueventd
+  vendor_init
+  vold
+}:process { ptrace signal sigstop sigkill };

public/crash_dump.te

 type crash_dump, domain;
 type crash_dump_exec, exec_type, file_type;
 
-allow crash_dump {
-  domain
-  -init
-  -crash_dump
-  -keystore
-  -logd
-}:process { ptrace signal sigchld sigstop sigkill };
-
 # crash_dump might inherit CAP_SYS_PTRACE from a privileged process,
 # which will result in an audit log even when it's allowed to trace.
 dontaudit crash_dump self:global_capability_class_set { sys_ptrace };