[asan] regression test for asan issue 19, currently fails.
git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@146681 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/asan/tests/dlclose-test.cc b/lib/asan/tests/dlclose-test.cc
new file mode 100644
index 0000000..3078866
--- /dev/null
+++ b/lib/asan/tests/dlclose-test.cc
@@ -0,0 +1,73 @@
+//===-- asan_rtl.cc ------------*- C++ -*-===//
+//
+// The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file is a part of AddressSanitizer, an address sanity checker.
+//
+// Regression test for
+// http://code.google.com/p/address-sanitizer/issues/detail?id=19
+// Bug description:
+// 1. application dlopens foo.so
+// 2. asan registers all globals from foo.so
+// 3. application dlcloses foo.so
+// 4. application mmaps some memory to the location where foo.so was before
+// 5. application starts using this mmaped memory, but asan still thinks there
+// are globals.
+// 6. BOOM
+//===----------------------------------------------------------------------===//
+#include <assert.h>
+#include <dlfcn.h>
+#include <stdio.h>
+#include <string.h>
+#include <sys/mman.h>
+
+#include <string>
+
+using std::string;
+
+static const int kPageSize = 4096;
+
+typedef int *(fun_t)();
+
+int main(int argc, char *argv[]) {
+ string path = string(argv[0]) + "-so.so";
+ printf("opening %s ... \n", path.c_str());
+ void *lib = dlopen(path.c_str(), RTLD_NOW);
+ if (!lib) {
+ printf("error in dlopen(): %s\n", dlerror());
+ return 1;
+ }
+ fun_t *get = (fun_t*)dlsym(lib, "get_address_of_static_var");
+ if (!get) {
+ printf("failed dlsym\n");
+ return 1;
+ }
+ int *addr = get();
+ assert(((size_t)addr % 32) == 0); // should be 32-byte aligned.
+ printf("addr: %p\n", addr);
+ addr[0] = 1; // make sure we can write there.
+
+ // Now dlclose the shared library.
+ printf("attempting to dlclose\n");
+ if (dlclose(lib)) {
+ printf("failed to dlclose\n");
+ return 1;
+ }
+ // Now, the page where 'addr' is unmapped. Map it.
+ size_t page_beg = ((size_t)addr) & ~(kPageSize - 1);
+ void *res = mmap((void*)(page_beg), kPageSize,
+ PROT_READ | PROT_WRITE,
+ MAP_PRIVATE | MAP_ANON | MAP_FIXED | MAP_NORESERVE, 0, 0);
+ if (res == (char*)-1L) {
+ printf("failed to mmap\n");
+ return 1;
+ }
+ addr[1] = 2; // BOOM (if the bug is not fixed).
+ printf("PASS\n");
+ return 0;
+}