kernel.patch

--- a/kernel/kcov.c	2017-12-16 16:43:08.000000000 -0500
+++ b/kernel/kcov.c	2020-12-01 17:45:39.286426893 -0500
@@ -111,6 +111,29 @@
 }
 EXPORT_SYMBOL(__sanitizer_cov_trace_pc);
 
+/* Entry point for object cover
+ */
+void notrace __sanitizer_obj_cov_trace_pc(void)
+{
+    struct task_struct *t;
+    unsigned long *area;
+    unsigned long ip = canonicalize_ip(_RET_IP_);
+    unsigned long pos;
+
+    t = current;
+    if (!check_kcov_mode(KCOV_MODE_TRACE_PC, t))
+        return;
+
+    area = t->kcov_area;
+    /* The first 64-bit word is the number of subsequent PCs. */
+    pos = READ_ONCE(area[0]) + 1;
+    if (likely(pos < t->kcov_size)) {
+        area[pos] = ip & 0xffffffff;
+        WRITE_ONCE(area[0], pos);
+    }
+}
+EXPORT_SYMBOL(__sanitizer_obj_cov_trace_pc);
+
 #ifdef CONFIG_KCOV_ENABLE_COMPARISONS
 static void write_comp_data(u64 type, u64 arg1, u64 arg2, u64 ip)
 {