Wait for QSEECom listeners before calling KMS APIs

Sometime it is possible that KMS APIs are invoked and QSEECom
listeners are not up. This would cause failure from secure side
and KMS API will fail eventually. This change waits for QSEECom
listeners to be up before calling KMS APIs. If QSEECom listeners
are not up even after wait period, API would fail without going
to secure side.

Change-Id: I211248645f92fc0fcfe6f250cb1f26661f5fb06c

1 files changed, 22 insertions, 0 deletions

diff --git a/cryptfs_hw.c b/cryptfs_hw.c
index b2efa4a..c7adfd1 100755
--- a/cryptfs_hw.c
+++ b/cryptfs_hw.c
@@ -67,6 +67,8 @@
 
 #define KEYMASTER_PARTITION_NAME "/dev/block/bootdevice/by-name/keymaster"
 
+#define QSEECOM_UP_CHECK_COUNT 10
+
 static int loaded_library = 0;
 static int (*qseecom_create_key)(int, void*);
 static int (*qseecom_update_key)(int, void*, void*);
@@ -118,12 +120,32 @@ static void wipe_userdata()
     android_reboot(ANDROID_RB_RESTART2, 0, "recovery");
 }
 
+static int is_qseecom_up()
+{
+    int i = 0;
+    char value[PROPERTY_VALUE_MAX] = {0};
+
+    for (; i<QSEECOM_UP_CHECK_COUNT; i++) {
+        property_get("sys.listeners.registered", value, "");
+        if (!strncmp(value, "true", PROPERTY_VALUE_MAX))
+            return 1;
+        usleep(100000);
+    }
+    return 0;
+}
+
+
 static int load_qseecom_library()
 {
     const char *error = NULL;
     if (loaded_library)
         return loaded_library;
 
+    if (!is_qseecom_up()) {
+        SLOGE("Timed out waiting for QSEECom listeners..aborting FDE key operation");
+        return 0;
+    }
+
     void * handle = dlopen(QSEECOM_LIBRARY_PATH, RTLD_NOW);
     if(handle) {
         dlerror(); /* Clear any existing error */