1 files changed, 83 insertions, 0 deletions
diff --git a/compiler-rt/test/msan/mmap.cpp b/compiler-rt/test/msan/mmap.cpp
new file mode 100644
index 00000000000..d8342373521
--- /dev/null
+++ b/compiler-rt/test/msan/mmap.cpp
@@ -0,0 +1,83 @@
+// Test that mmap (without MAP_FIXED) always returns valid application addresses.
+// RUN: %clangxx_msan -O0 %s -o %t && %run %t
+// RUN: %clangxx_msan -O0 -fsanitize-memory-track-origins %s -o %t && %run %t
+
+#include <assert.h>
+#include <errno.h>
+#include <stdint.h>
+#include <sys/mman.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include "test.h"
+
+bool AddrIsApp(void *p) {
+  uintptr_t addr = (uintptr_t)p;
+#if defined(__FreeBSD__) && defined(__x86_64__)
+  return addr < 0x010000000000ULL || addr >= 0x600000000000ULL;
+#elif defined(__x86_64__)
+  return (addr >= 0x000000000000ULL && addr < 0x010000000000ULL) ||
+         (addr >= 0x510000000000ULL && addr < 0x600000000000ULL) ||
+         (addr >= 0x700000000000ULL && addr < 0x800000000000ULL);
+#elif defined(__mips64)
+  return (addr >= 0x0000000000ULL && addr <= 0x0200000000ULL) ||
+         (addr >= 0xa200000000ULL && addr <= 0xc000000000ULL) ||
+         addr >= 0xe200000000ULL;
+#elif defined(__powerpc64__)
+  return addr < 0x000100000000ULL || addr >= 0x300000000000ULL;
+#elif defined(__aarch64__)
+
+  struct AddrMapping {
+    uintptr_t start;
+    uintptr_t end;
+  } mappings[] = {
+    {0x05000000000ULL, 0x06000000000ULL},
+    {0x07000000000ULL, 0x08000000000ULL},
+    {0x0F000000000ULL, 0x10000000000ULL},
+    {0x11000000000ULL, 0x12000000000ULL},
+    {0x20000000000ULL, 0x21000000000ULL},
+    {0x2A000000000ULL, 0x2B000000000ULL},
+    {0x2E000000000ULL, 0x2F000000000ULL},
+    {0x3B000000000ULL, 0x3C000000000ULL},
+    {0x3F000000000ULL, 0x40000000000ULL},
+    {0x0041000000000ULL, 0x0042000000000ULL},
+    {0x0050000000000ULL, 0x0051000000000ULL},
+    {0x0058000000000ULL, 0x0059000000000ULL},
+    {0x0061000000000ULL, 0x0062000000000ULL},
+    {0x0AAAAA0000000ULL, 0x0AAAB00000000ULL},
+    {0x0FFFF00000000ULL, 0x1000000000000ULL},
+  };
+  const size_t mappingsSize = sizeof (mappings) / sizeof (mappings[0]);
+
+  for (int i=0; i<mappingsSize; ++i)
+    if (addr >= mappings[i].start && addr < mappings[i].end)
+      return true;
+  return false;
+#endif
+}
+
+int main() {
+  // Large enough to quickly exhaust the entire address space.
+#if defined(__mips64) || defined(__aarch64__)
+  const size_t kMapSize = 0x100000000ULL;
+#else
+  const size_t kMapSize = 0x1000000000ULL;
+#endif
+  int success_count = 0;
+  int flags = MAP_PRIVATE | MAP_ANONYMOUS;
+#if defined(MAP_NORESERVE)
+  flags |= MAP_NORESERVE;
+#endif
+  while (true) {
+    void *p = mmap(0, kMapSize, PROT_WRITE,
+                   flags, -1, 0);
+    printf("%p\n", p);
+    if (p == MAP_FAILED) {
+      assert(errno == ENOMEM);
+      break;
+    }
+    assert(AddrIsApp(p));
+    success_count++;
+  }
+  printf("successful mappings: %d\n", success_count);
+  assert(success_count > 5);
+}