JSBigString to MAP_PRIVATE not MAP_SHARED

Reviewed By: mhorowitz Differential Revision: D6613463 fbshipit-source-id: 2553a0475ade061f3b70ffce90fcf4e0ceb7d9fa
facebook · Dec 20, 2017 · f9f40cd · f9f40cd
1 parent 9b147a5
commit f9f40cd
Showing 1 changed file with 2 additions and 1 deletion.
diff --git a/ReactCommon/cxxreact/JSBigString.h b/ReactCommon/cxxreact/JSBigString.h
@@ -146,7 +146,8 @@ class RN_EXPORT JSBigFileString : public JSBigString {
 
   const char *c_str() const override {
     if (!m_data) {
-      m_data = (const char *)mmap(0, m_size, PROT_READ, MAP_SHARED, m_fd, m_mapOff);
+      m_data =
+        (const char *)mmap(0, m_size, PROT_READ, MAP_PRIVATE, m_fd, m_mapOff);
       CHECK(m_data != MAP_FAILED)
       << " fd: " << m_fd
       << " size: " << m_size