commit fcdbee322188e616da2c7a3be72eebc6801e12f6
author Florian Mayer <fmayer@google.com> Mon Mar 10 13:02:30 2025 -0700
committer Florian Mayer <fmayer@google.com> Mon Mar 10 13:02:46 2025 -0700
tree 9d8a599ddd0668fd4d5c93d631fda96f03a2fef6
parent 9cdc362a2f7463670a766400defcd332a9edfe19

[MTE] add mte_enabled function

Change-Id: I38d35d41c73096a49bd18c0de6ac1e6291ca83cf

libc/platform/bionic/mte.h

diff --git a/libc/platform/bionic/mte.h b/libc/platform/bionic/mte.h
index 610cb45..27cbae1 100644
--- a/libc/platform/bionic/mte.h
+++ b/libc/platform/bionic/mte.h
@@ -50,6 +50,16 @@
   return supported;
 }
 
+static inline bool mte_enabled() {
+#ifdef __aarch64__
+  int level = prctl(PR_GET_TAGGED_ADDR_CTRL, 0, 0, 0, 0);
+  return level >= 0 && (level & PR_TAGGED_ADDR_ENABLE) &&
+         (level & PR_MTE_TCF_MASK) != PR_MTE_TCF_NONE;
+#else
+  return false;
+#endif
+}
+
 inline void* get_tagged_address(const void* ptr) {
 #if defined(__aarch64__)
   if (mte_supported()) {