base: disabled mem watchdog when MTE is enabled

Bug: 352076969
Change-Id: I78ecdfc876a99b78840a06cc8799e54b553e0a10

src/base/utils.cc

diff --git a/src/base/utils.cc b/src/base/utils.cc
index ab3f390..0d9318c 100644
--- a/src/base/utils.cc
+++ b/src/base/utils.cc
@@ -38,6 +38,25 @@
 #include <mach/vm_page_size.h>
 #endif
 
+#if PERFETTO_BUILDFLAG(PERFETTO_OS_LINUX) || \
+    PERFETTO_BUILDFLAG(PERFETTO_OS_ANDROID)
+#include <linux/prctl.h>
+#include <sys/prctl.h>
+
+#ifndef PR_GET_TAGGED_ADDR_CTRL
+#define PR_GET_TAGGED_ADDR_CTRL 56
+#endif
+
+#ifndef PR_TAGGED_ADDR_ENABLE
+#define PR_TAGGED_ADDR_ENABLE (1UL << 0)
+#endif
+
+#ifndef PR_MTE_TCF_SYNC
+#define PR_MTE_TCF_SYNC (1UL << 1)
+#endif
+
+#endif  // OS_LINUX | OS_ANDROID
+
 #if PERFETTO_BUILDFLAG(PERFETTO_OS_WIN)
 #include <Windows.h>
 #include <io.h>
@@ -318,6 +337,23 @@
 #endif
 }
 
+bool IsSyncMemoryTaggingEnabled() {
+#if PERFETTO_BUILDFLAG(PERFETTO_OS_LINUX) || \
+    PERFETTO_BUILDFLAG(PERFETTO_OS_ANDROID)
+  // Compute only once per lifetime of the process.
+  static bool cached_value = [] {
+    const int res = prctl(PR_GET_TAGGED_ADDR_CTRL, 0, 0, 0, 0);
+    if (res < 0)
+      return false;
+    const uint32_t actl = static_cast<uint32_t>(res);
+    return (actl & PR_TAGGED_ADDR_ENABLE) && (actl & PR_MTE_TCF_SYNC);
+  }();
+  return cached_value;
+#else
+  return false;
+#endif
+}
+
 std::string HexDump(const void* data_void, size_t len, size_t bytes_per_line) {
   const char* data = reinterpret_cast<const char*>(data_void);
   std::string res;