Include memory tags in memory dump output.

Tags appear in the addresses printed in the memory dump, which seems
like a reasonable place to put them because tagged addresses will
also appear in other places in the tombstone, such as registers and
the fault address.

Bug: 135772972
Change-Id: I52da338347ff6b7503cf5ac80763c540695dc061

1 files changed, 50 insertions, 0 deletions

diff --git a/debuggerd/debuggerd_test.cpp b/debuggerd/debuggerd_test.cpp
index f1119cc03..108787e4a 100644
--- a/debuggerd/debuggerd_test.cpp
+++ b/debuggerd/debuggerd_test.cpp
@@ -18,6 +18,7 @@
 #include <fcntl.h>
 #include <stdlib.h>
 #include <sys/capability.h>
+#include <sys/mman.h>
 #include <sys/prctl.h>
 #include <sys/ptrace.h>
 #include <sys/resource.h>
@@ -556,6 +557,55 @@ TEST_F(CrasherTest, mte_multiple_causes) {
 #endif
 }
 
+#if defined(__aarch64__) && defined(ANDROID_EXPERIMENTAL_MTE)
+static uintptr_t CreateTagMapping() {
+  uintptr_t mapping =
+      reinterpret_cast<uintptr_t>(mmap(nullptr, getpagesize(), PROT_READ | PROT_WRITE | PROT_MTE,
+                                       MAP_PRIVATE | MAP_ANONYMOUS, -1, 0));
+  if (reinterpret_cast<void*>(mapping) == MAP_FAILED) {
+    return 0;
+  }
+  __asm__ __volatile__(".arch_extension mte; stg %0, [%0]"
+                       :
+                       : "r"(mapping + (1ULL << 56))
+                       : "memory");
+  return mapping;
+}
+#endif
+
+TEST_F(CrasherTest, mte_tag_dump) {
+#if defined(__aarch64__) && defined(ANDROID_EXPERIMENTAL_MTE)
+  if (!mte_supported()) {
+    GTEST_SKIP() << "Requires MTE";
+  }
+
+  int intercept_result;
+  unique_fd output_fd;
+  StartProcess([&]() {
+    SetTagCheckingLevelSync();
+    Trap(reinterpret_cast<void *>(CreateTagMapping()));
+  });
+
+  StartIntercept(&output_fd);
+  FinishCrasher();
+  AssertDeath(SIGTRAP);
+  FinishIntercept(&intercept_result);
+
+  ASSERT_EQ(1, intercept_result) << "tombstoned reported failure";
+
+  std::string result;
+  ConsumeFd(std::move(output_fd), &result);
+
+  ASSERT_MATCH(result, R"(memory near x0:
+.*
+.*
+    01.............0 0000000000000000 0000000000000000  ................
+    00.............0)");
+#else
+  GTEST_SKIP() << "Requires aarch64 + ANDROID_EXPERIMENTAL_MTE";
+#endif
+}
+
 TEST_F(CrasherTest, LD_PRELOAD) {
   int intercept_result;
   unique_fd output_fd;