executor: filter out invalid PCs on linux/x86_64

Fuzzer manages to corrupt output region and write random coverage again and again.
Do a sanity range check on coverage PCs to filter out invalid ones.

1 files changed, 10 insertions, 0 deletions

diff --git a/executor/executor_akaros.cc b/executor/executor_akaros.cc
index 70940dbb4..4523b736a 100644
--- a/executor/executor_akaros.cc
+++ b/executor/executor_akaros.cc
@@ -96,6 +96,16 @@ uint32 read_cover_size(thread_t* th)
 	return 0;
 }
 
+bool cover_check(uint32 pc)
+{
+	return true;
+}
+
+bool cover_check(uint64 pc)
+{
+	return true;
+}
+
 uint32* write_output(uint32 v)
 {
 	return &output;