[asan] Add a test case for global registration

This test case checks that globals from all object files are being registered
after they've been linked together. It also checks that globals from libraries
loaded at runtime are registered.



git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@273464 91177308-0d34-0410-b5e6-96231b3b80d8

Author: Ryan Govostes

test/asan/TestCases/Posix/global-registration.c

@@ -0,0 +1,56 @@
+// Test that globals from different shared objects all get registered.
+
+// This source file is compiled into three different source object files. Each
+// object file declares a global buffer. The first two are linked together, and
+// the third is loaded at runtime. We make sure that out-of-bounds accesses
+// are caught for all three buffers.
+
+// RUN: %clang_asan -c -o %t-one.o -DDYNAMICLIB=\"%t-dynamic.so\" -DMAIN_FILE %s
+// RUN: %clang_asan -c -o %t-two.o -DSECONDARY_FILE %s
+// RUN: %clang_asan -o %t %t-one.o %t-two.o
+// RUN: %clang_asan -shared -o %t-dynamic.so -DSHARED_LIBRARY_FILE %s
+// RUN: not %run %t 1 2>&1 | FileCheck --check-prefix ASAN-CHECK-1 %s
+// RUN: not %run %t 2 2>&1 | FileCheck --check-prefix ASAN-CHECK-2 %s
+// RUN: not %run %t 3 2>&1 | FileCheck --check-prefix ASAN-CHECK-3 %s
+
+#if MAIN_FILE
+
+#include <dlfcn.h>
+#include <stdlib.h>
+
+extern char buffer2[1];
+char buffer1[1] = { };
+
+int main(int argc, char *argv[]) {
+  int n = atoi(argv[1]);
+  if (n == 1) {
+    buffer1[argc] = 0;
+    // ASAN-CHECK-1: {{0x.* is located 1 bytes .* 'buffer1'}}
+  } else if (n == 2) {
+    buffer2[argc] = 0;
+    // ASAN-CHECK-2: {{0x.* is located 1 bytes .* 'buffer2'}}
+  } else if (n == 3) {
+    void *handle = dlopen(DYNAMICLIB, RTLD_NOW);
+    if (!handle)
+      return 1;
+    
+    char *buffer = (char *)dlsym(handle, "buffer3");
+    if (!buffer)
+      return 1;
+    
+    buffer[argc] = 0;
+    // ASAN-CHECK-3: {{0x.* is located 1 bytes .* 'buffer3'}}
+  }
+  
+  return 0;
+}
+
+#elif SECONDARY_FILE
+
+char buffer2[1] = { };
+
+#elif SHARED_LIBRARY_FILE
+
+char buffer3[1] = { };
+
+#endif