diff --git a/build/sanitizers/ubsan_function_blacklist.txt b/build/sanitizers/ubsan_function_blacklist.txt
new file mode 100644
index 000000000000..42dadcd179e5
--- /dev/null
+++ b/build/sanitizers/ubsan_function_blacklist.txt
@@ -0,0 +1,4 @@
+[function]
+# Disable function sanitizer for all C files (new feature in clang 17) until we
+# we can narrow this down. See bug 1841935.
+src:*.c