llkd: Add stack symbol checking

llkd needs the ptrace capabilities and dac override to monitor for
live lock conditions on the stack dumps.

Test: compile
Bug: 33808187
Change-Id: Ibc1e4cc10395fa9685c4ef0ca214daf212a5e126
diff --git a/private/crash_dump.te b/private/crash_dump.te
index a50740e..aabff29 100644
--- a/private/crash_dump.te
+++ b/private/crash_dump.te
@@ -7,17 +7,23 @@
   -init
   -kernel
   -keystore
+  -llkd
   -logd
   -ueventd
   -vendor_init
   -vold
 }:process { ptrace signal sigchld sigstop sigkill };
+userdebug_or_eng(`
+  allow crash_dump { llkd logd }:process { ptrace signal sigchld sigstop sigkill };
+')
 
 neverallow crash_dump {
   bpfloader
   init
   kernel
   keystore
+  llkd
+  userdebug_or_eng(`-llkd')
   logd
   userdebug_or_eng(`-logd')
   ueventd