1 files changed, 51 insertions, 0 deletions
diff --git a/test/asan/TestCases/Darwin/malloc_set_zone_name-mprotect.cc b/test/asan/TestCases/Darwin/malloc_set_zone_name-mprotect.cc
new file mode 100644
index 000000000000..2c643bc03c52
--- /dev/null
+++ b/test/asan/TestCases/Darwin/malloc_set_zone_name-mprotect.cc
@@ -0,0 +1,51 @@
+// Regression test for a bug in malloc_create_zone()
+// (https://code.google.com/p/address-sanitizer/issues/detail?id=203)
+// The old implementation of malloc_create_zone() didn't always return a
+// page-aligned address, so we can only test on a best-effort basis.
+
+// RUN: %clangxx_asan %s -o %t
+// RUN: %run %t 2>&1
+
+#include <malloc/malloc.h>
+#include <stdlib.h>
+#include <string.h>
+#include <stdio.h>
+
+const int kNumIter = 4096;
+const int kNumZones = 100;
+int main() {
+  char *mem[kNumIter * 2];
+  // Allocate memory chunks from different size classes up to 1 page.
+  // (For the case malloc() returns memory chunks in descending order)
+  for (int i = 0; i < kNumIter; i++) {
+    mem[i] = (char*)malloc(8 * i);
+  }
+  // Try to allocate a page-aligned malloc zone. Otherwise the mprotect() call
+  // in malloc_set_zone_name() will silently fail.
+  malloc_zone_t *zone = NULL;
+  bool aligned = false;
+  for (int i = 0; i < kNumZones; i++) {
+    zone = malloc_create_zone(0, 0);
+    if (((uintptr_t)zone & (~0xfff)) == (uintptr_t)zone) {
+      aligned = true;
+      break;
+    }
+  }
+  if (!aligned) {
+    printf("Warning: couldn't allocate a page-aligned zone.");
+    return 0;
+  }
+  // malloc_set_zone_name() calls mprotect(zone, 4096, PROT_READ | PROT_WRITE),
+  // modifies the zone contents and then calls mprotect(zone, 4096, PROT_READ).
+  malloc_set_zone_name(zone, "foobar");
+  // Allocate memory chunks from different size classes again.
+  for (int i = 0; i < kNumIter; i++) {
+    mem[i + kNumIter] = (char*)malloc(8 * i);
+  }
+  // Access the allocated memory chunks and free them.
+  for (int i = 0; i < kNumIter * 2; i++) {
+    memset(mem[i], 'a', 8 * (i % kNumIter));
+    free(mem[i]);
+  }
+  return 0;
+}