diff --git a/drivers/char/adsprpc.c b/drivers/char/adsprpc.c
index 0f6a045..013de26 100644
--- a/drivers/char/adsprpc.c
+++ b/drivers/char/adsprpc.c
@@ -2562,6 +2562,12 @@
 		remote_arg_t ra[1];
 		int tgid = fl->tgid;
 
+		if (fl->dev_minor == MINOR_NUM_DEV) {
+			err = -ECONNREFUSED;
+			pr_err("adsprpc: %s: untrusted app trying to attach to privileged DSP PD\n",
+				__func__);
+			return err;
+		}
 		ra[0].buf.pv = (void *)&tgid;
 		ra[0].buf.len = sizeof(tgid);
 		ioctl.inv.handle = FASTRPC_STATIC_HANDLE_PROCESS_GROUP;
@@ -2702,6 +2708,13 @@
 			unsigned int pageslen;
 		} inbuf;
 
+		if (fl->dev_minor == MINOR_NUM_DEV) {
+			err = -ECONNREFUSED;
+			pr_err("adsprpc: %s: untrusted app trying to attach to audio PD\n",
+				__func__);
+			return err;
+		}
+
 		if (!init->filelen)
 			goto bail;