[interception] Check for export table's size before referring to its elements.

This fix a bug, when calling InternalGetProcAddress() for an executable that
doesn't export any symbol. So the table is empty.
If we don't check for this condition, the program fails with Error 0xc0000142.

Also, I add a regression test for Windows.

Differential Revision: https://reviews.llvm.org/D28502

llvm-svn: 292747

compiler-rt/lib/interception/interception_win.cc

@@ -878,6 +878,8 @@ uptr InternalGetProcAddress(void *module, const char *func_name) {
 
   IMAGE_DATA_DIRECTORY *export_directory =
       &headers->OptionalHeader.DataDirectory[IMAGE_DIRECTORY_ENTRY_EXPORT];
+  if (export_directory->Size == 0)
+    return 0;
   RVAPtr<IMAGE_EXPORT_DIRECTORY> exports(module,
                                          export_directory->VirtualAddress);
   RVAPtr<DWORD> functions(module, exports->AddressOfFunctions);

compiler-rt/test/interception/CMakeLists.txt

@@ -1,5 +1,30 @@
 set(INTERCEPTION_TEST_DEPS ${SANITIZER_COMMON_LIT_TEST_DEPS})
 set(INTERCEPTION_TESTSUITES)
+set(INTERCEPTION_LIT_SOURCE_DIR ${CMAKE_CURRENT_SOURCE_DIR})
+
+foreach(arch ${SANITIZER_COMMON_SUPPORTED_ARCH})
+  set(INTERCEPTION_TEST_TARGET_ARCH ${arch})
+  set(CONFIG_NAME ${arch}-${OS_NAME})
+
+  get_test_cc_for_arch(${arch} INTERCEPTION_TEST_TARGET_CC
+    INTERCEPTION_TEST_TARGET_CFLAGS)
+
+  string(TOUPPER ${arch} ARCH_UPPER_CASE)
+  set(CONFIG_NAME ${ARCH_UPPER_CASE}${OS_NAME}Config)
+  set(INTERCEPTION_TEST_TARGET_LIB RTInterception.test.${arch})
+
+  get_property(INTERCEPTION_TEST_TARGET_LIB_DIR TARGET
+    ${INTERCEPTION_TEST_TARGET_LIB} PROPERTY ARCHIVE_OUTPUT_DIRECTORY)
+
+  configure_lit_site_cfg(
+    ${CMAKE_CURRENT_SOURCE_DIR}/lit.site.cfg.in
+    ${CMAKE_CURRENT_BINARY_DIR}/${CONFIG_NAME}/lit.site.cfg
+    )
+
+  list(APPEND INTERCEPTION_TESTSUITES
+    ${CMAKE_CURRENT_BINARY_DIR}/${CONFIG_NAME})
+  list(APPEND INTERCEPTION_TEST_DEPS RTInterception.test.${arch})
+endforeach()
 
 # Unit tests. There are currently no unit tests capable to running on Apple or
 # Android targets.

compiler-rt/test/interception/TestCases/Windows/empty_export_table.cc

@@ -0,0 +1,17 @@
+// RUN: %clang_cl %s %inter_lib -o %t
+// RUN: %run %t 2>&1 | FileCheck %s
+// CHECK: OK
+
+#include "interception/interception.h"
+#include <stdio.h>
+#include <windows.h>
+
+// We try to get a pointer to a function from an executable that doesn't export
+// any symbol (empty export table).
+int main() {
+  __sanitizer::uptr FunPtr = __interception::InternalGetProcAddress(
+      (void *)GetModuleHandleA(0), "exampleFun");
+  if (FunPtr == 0)
+    printf("OK");
+  return 0;
+}

compiler-rt/test/interception/TestCases/Windows/lit.local.cfg

@@ -0,0 +1,9 @@
+def getRoot(config):
+  if not config.parent:
+    return config
+  return getRoot(config.parent)
+
+root = getRoot(config)
+
+if root.host_os not in ['Windows']:
+  config.unsupported = True

compiler-rt/test/interception/lit.cfg

@@ -0,0 +1,28 @@
+# -*- Python -*-
+
+# Setup source root.
+config.test_source_root = os.path.join(os.path.dirname(__file__), "TestCases")
+
+# Setup config name.
+config.name = "Interception"
+
+# Add library sustitutions.
+if config.host_os == 'Windows':
+  libpath = os.path.join(config.target_lib_dir, config.target_lib + ".lib")
+  config.substitutions.append( ("%inter_lib", libpath))
+else:
+  libpath = os.path.join(config.target_lib_dir, "lib" + config.target_lib + ".a")
+  config.substitutions.append( ("%inter_lib", libpath))
+
+# Add clang substitutions.
+config.substitutions.append( ("%clang ", " ".join([config.clang,
+    config.target_cflags, "-I"+config.sources_dir, ""]) ))
+
+# Configure clang_cl for Windows.
+if config.host_os == 'Windows':
+  clang_cl_invocation = config.clang.replace("clang.exe","clang-cl.exe")
+  config.substitutions.append( ("%clang_cl ", " ".join([clang_cl_invocation,
+      config.target_cflags, "/I"+config.sources_dir, ""]) ))
+
+# Files to be considered for tests.
+config.suffixes = ['.c', '.cc', '.cpp']

compiler-rt/test/interception/lit.site.cfg.in

@@ -0,0 +1,15 @@
+@LIT_SITE_CFG_IN_HEADER@
+
+# Tool-specific config options.
+config.target_cflags = "@INTERCEPTION_TEST_TARGET_CFLAGS@"
+config.clang = "@INTERCEPTION_TEST_TARGET_CC@"
+config.target_arch = "@INTERCEPTION_TEST_TARGET_ARCH@"
+config.target_lib = "@INTERCEPTION_TEST_TARGET_LIB@"
+config.target_lib_dir = "@INTERCEPTION_TEST_TARGET_LIB_DIR@"
+config.sources_dir = os.path.join("@COMPILER_RT_SOURCE_DIR@", "lib")
+
+# Load common config for all compiler-rt lit tests.
+lit_config.load_config(config, "@COMPILER_RT_BINARY_DIR@/test/lit.common.configured")
+
+# Load tool-specific config that would do the real work.
+lit_config.load_config(config, "@INTERCEPTION_LIT_SOURCE_DIR@/lit.cfg")