// Copyright (c) 2010, Google Inc. // All rights reserved. // // Redistribution and use in source and binary forms, with or without // modification, are permitted provided that the following conditions are // met: // // * Redistributions of source code must retain the above copyright // notice, this list of conditions and the following disclaimer. // * Redistributions in binary form must reproduce the above // copyright notice, this list of conditions and the following disclaimer // in the documentation and/or other materials provided with the // distribution. // * Neither the name of Google Inc. nor the names of its // contributors may be used to endorse or promote products derived from // this software without specific prior written permission. // // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE #include #include #include #include "breakpad_googletest_includes.h" #include "common/using_std_string.h" #include "google_breakpad/processor/basic_source_line_resolver.h" #include "google_breakpad/processor/minidump_processor.h" #include "google_breakpad/processor/process_state.h" #ifndef _WIN32 #include "processor/exploitability_linux.h" #endif // _WIN32 #include "processor/simple_symbol_supplier.h" #ifndef _WIN32 namespace google_breakpad { class ExploitabilityLinuxTest : public ExploitabilityLinux { public: using ExploitabilityLinux::CalculateAddress; using ExploitabilityLinux::DisassembleBytes; using ExploitabilityLinux::GetObjdumpInstructionLine; using ExploitabilityLinux::TokenizeObjdumpInstruction; }; class ExploitabilityLinuxTestMinidumpContext : public MinidumpContext { public: explicit ExploitabilityLinuxTestMinidumpContext( const MDRawContextAMD64& context) : MinidumpContext(NULL) { valid_ = true; SetContextAMD64(new MDRawContextAMD64(context)); SetContextFlags(MD_CONTEXT_AMD64); } }; } // namespace google_breakpad #endif // _WIN32 namespace { using google_breakpad::BasicSourceLineResolver; #ifndef _WIN32 using google_breakpad::ExploitabilityLinuxTest; using google_breakpad::ExploitabilityLinuxTestMinidumpContext; #endif // _WIN32 using google_breakpad::MinidumpProcessor; using google_breakpad::ProcessState; using google_breakpad::SimpleSymbolSupplier; string TestDataDir() { return string(getenv("srcdir") ? getenv("srcdir") : ".") + "/src/processor/testdata"; } // Find the given dump file in /src/processor/testdata, process it, // and get the exploitability rating. Returns EXPLOITABILITY_ERR_PROCESSING // if the crash dump can't be processed. google_breakpad::ExploitabilityRating ExploitabilityFor(const string& filename) { SimpleSymbolSupplier supplier(TestDataDir() + "/symbols"); BasicSourceLineResolver resolver; MinidumpProcessor processor(&supplier, &resolver, true); processor.set_enable_objdump(true); ProcessState state; string minidump_file = TestDataDir() + "/" + filename; if (processor.Process(minidump_file, &state) != google_breakpad::PROCESS_OK) { return google_breakpad::EXPLOITABILITY_ERR_PROCESSING; } return state.exploitability(); } TEST(ExploitabilityTest, TestWindowsEngine) { ASSERT_EQ(google_breakpad::EXPLOITABILITY_HIGH, ExploitabilityFor("ascii_read_av.dmp")); ASSERT_EQ(google_breakpad::EXPLOITABILITY_HIGH, ExploitabilityFor("ascii_read_av_block_write.dmp")); ASSERT_EQ(google_breakpad::EXPLOITABILITY_HIGH, ExploitabilityFor("ascii_read_av_clobber_write.dmp")); ASSERT_EQ(google_breakpad::EXPLOITABILITY_HIGH, ExploitabilityFor("ascii_read_av_conditional.dmp")); ASSERT_EQ(google_breakpad::EXPLOITABILITY_HIGH, ExploitabilityFor("ascii_read_av_then_jmp.dmp")); ASSERT_EQ(google_breakpad::EXPLOITABILITY_HIGH, ExploitabilityFor("ascii_read_av_xchg_write.dmp")); ASSERT_EQ(google_breakpad::EXPLOITABILITY_HIGH, ExploitabilityFor("ascii_write_av.dmp")); ASSERT_EQ(google_breakpad::EXPLOITABILITY_HIGH, ExploitabilityFor("ascii_write_av_arg_to_call.dmp")); ASSERT_EQ(google_breakpad::EXPLOITABILITY_NONE, ExploitabilityFor("null_read_av.dmp")); ASSERT_EQ(google_breakpad::EXPLOITABILITY_NONE, ExploitabilityFor("null_write_av.dmp")); ASSERT_EQ(google_breakpad::EXPLOITABILITY_NONE, ExploitabilityFor("stack_exhaustion.dmp")); ASSERT_EQ(google_breakpad::EXPLOITABILITY_HIGH, ExploitabilityFor("exec_av_on_stack.dmp")); ASSERT_EQ(google_breakpad::EXPLOITABILITY_MEDIUM, ExploitabilityFor("write_av_non_null.dmp")); ASSERT_EQ(google_breakpad::EXPLOITABILITY_LOW, ExploitabilityFor("read_av_non_null.dmp")); ASSERT_EQ(google_breakpad::EXPLOITABILITY_LOW, ExploitabilityFor("read_av_clobber_write.dmp")); ASSERT_EQ(google_breakpad::EXPLOITABILITY_LOW, ExploitabilityFor("read_av_conditional.dmp")); } TEST(ExploitabilityTest, TestLinuxEngine) { ASSERT_EQ(google_breakpad::EXPLOITABILITY_INTERESTING, ExploitabilityFor("linux_null_read_av.dmp")); ASSERT_EQ(google_breakpad::EXPLOITABILITY_HIGH, ExploitabilityFor("linux_overflow.dmp")); ASSERT_EQ(google_breakpad::EXPLOITABILITY_HIGH, ExploitabilityFor("linux_stacksmash.dmp")); ASSERT_EQ(google_breakpad::EXPLOITABILITY_NONE, ExploitabilityFor("linux_divide_by_zero.dmp")); ASSERT_EQ(google_breakpad::EXPLOITABILITY_INTERESTING, ExploitabilityFor("linux_null_dereference.dmp")); ASSERT_EQ(google_breakpad::EXPLOITABILITY_HIGH, ExploitabilityFor("linux_jmp_to_0.dmp")); ASSERT_EQ(google_breakpad::EXPLOITABILITY_HIGH, ExploitabilityFor("linux_outside_module.dmp")); ASSERT_EQ(google_breakpad::EXPLOITABILITY_NONE, ExploitabilityFor("linux_raise_sigabrt.dmp")); ASSERT_EQ(google_breakpad::EXPLOITABILITY_INTERESTING, ExploitabilityFor("linux_inside_module_exe_region1.dmp")); ASSERT_EQ(google_breakpad::EXPLOITABILITY_INTERESTING, ExploitabilityFor("linux_inside_module_exe_region2.dmp")); ASSERT_EQ(google_breakpad::EXPLOITABILITY_INTERESTING, ExploitabilityFor("linux_stack_pointer_in_stack.dmp")); ASSERT_EQ(google_breakpad::EXPLOITABILITY_INTERESTING, ExploitabilityFor("linux_stack_pointer_in_stack_alt_name.dmp")); ASSERT_EQ(google_breakpad::EXPLOITABILITY_HIGH, ExploitabilityFor("linux_stack_pointer_in_module.dmp")); ASSERT_EQ(google_breakpad::EXPLOITABILITY_HIGH, ExploitabilityFor("linux_executable_stack.dmp")); ASSERT_EQ(google_breakpad::EXPLOITABILITY_HIGH, ExploitabilityFor("linux_executable_heap.dmp")); ASSERT_EQ(google_breakpad::EXPLOITABILITY_HIGH, ExploitabilityFor("linux_jmp_to_module_not_exe_region.dmp")); #ifndef _WIN32 ASSERT_EQ(google_breakpad::EXPLOITABILITY_HIGH, ExploitabilityFor("linux_write_to_nonwritable_module.dmp")); ASSERT_EQ(google_breakpad::EXPLOITABILITY_HIGH, ExploitabilityFor("linux_write_to_nonwritable_region_math.dmp")); ASSERT_EQ(google_breakpad::EXPLOITABILITY_HIGH, ExploitabilityFor("linux_write_to_outside_module.dmp")); ASSERT_EQ(google_breakpad::EXPLOITABILITY_HIGH, ExploitabilityFor("linux_write_to_outside_module_via_math.dmp")); ASSERT_EQ(google_breakpad::EXPLOITABILITY_INTERESTING, ExploitabilityFor("linux_write_to_under_4k.dmp")); #endif // _WIN32 } #ifndef _WIN32 TEST(ExploitabilityLinuxUtilsTest, DisassembleBytesTest) { ASSERT_FALSE(ExploitabilityLinuxTest::DisassembleBytes("", NULL, 5, NULL)); uint8_t bytes[6] = {0xc7, 0x0, 0x5, 0x0, 0x0, 0x0}; char buffer[1024] = {0}; ASSERT_TRUE(ExploitabilityLinuxTest::DisassembleBytes("i386:x86-64", bytes, 1024, buffer)); std::stringstream objdump_stream; objdump_stream.str(string(buffer)); string line = ""; while (line.find("<.data>") == string::npos) getline(objdump_stream, line); getline(objdump_stream, line); ASSERT_EQ(line, " 0:\tc7 00 05 00 00 00 \tmov DWORD PTR [rax],0x5"); } TEST(ExploitabilityLinuxUtilsTest, GetObjdumpInstructionLine) { string disassebly = "\n" "/tmp/breakpad_mem_region-raw_bytes-tMmMo0: file format binary\n" "// Trying to confuse the parser 0:\n" "\n" "Disassembly of section .data:\n" "\n" "0000000000000000 <.data>:\n" " 0:\tc7 00 01 00 00 00 \tmov DWORD PTR [rax],0x1\n" " 6:\t5d \tpop rbp\n" " 7:\tc3 \tret \n" " 8:\t55 \tpush rbp\n" " 9:\t48 89 e5 \tmov rbp,rsp\n" " c:\t53 \tpush rbx\n" " d:\t48 \trex.W\n" " e:\t81 \t.byte 0x81\n"; string line; EXPECT_TRUE(ExploitabilityLinuxTest::GetObjdumpInstructionLine( disassebly.c_str(), &line)); EXPECT_EQ(" 0:\tc7 00 01 00 00 00 \tmov DWORD PTR [rax],0x1", line); // There is no "0:" after "<.data>:". Expected to return false. disassebly = "\n" "/tmp/breakpad_mem_region-raw_bytes-tMmMo0: file format binary\n" "// Trying to confuse the parser 0:\n" "\n" "Disassembly of section .data:\n" "\n" " 0:\tc7 00 01 00 00 00 \tmov DWORD PTR [rax],0x1\n" " 6:\t5d \tpop rbp\n" " 7:\tc3 \tret \n" " 8:\t55 \tpush rbp\n" " 9:\t48 89 e5 \tmov rbp,rsp\n" " d:\t48 \trex.W\n" "0000000000000000 <.data>:\n" " c:\t53 \tpush rbx\n"; EXPECT_FALSE(ExploitabilityLinuxTest::GetObjdumpInstructionLine( disassebly.c_str(), &line)); } TEST(ExploitabilityLinuxUtilsTest, TokenizeObjdumpInstructionTest) { ASSERT_FALSE(ExploitabilityLinuxTest::TokenizeObjdumpInstruction("", NULL, NULL, NULL)); string line = "0: c7 00 05 00 00 00 mov DWORD PTR [rax],0x5"; string operation = ""; string dest = ""; string src = ""; ASSERT_TRUE(ExploitabilityLinuxTest::TokenizeObjdumpInstruction(line, &operation, &dest, &src)); ASSERT_EQ(operation, "mov"); ASSERT_EQ(dest, "[rax]"); ASSERT_EQ(src, "0x5"); line = "0: c3 ret"; ASSERT_TRUE(ExploitabilityLinuxTest::TokenizeObjdumpInstruction(line, &operation, &dest, &src)); ASSERT_EQ(operation, "ret"); ASSERT_EQ(dest, ""); ASSERT_EQ(src, ""); line = "0: 5f pop rdi"; ASSERT_TRUE(ExploitabilityLinuxTest::TokenizeObjdumpInstruction(line, &operation, &dest, &src)); ASSERT_EQ(operation, "pop"); ASSERT_EQ(dest, "rdi"); ASSERT_EQ(src, ""); } TEST(ExploitabilityLinuxUtilsTest, CalculateAddressTest) { MDRawContextAMD64 raw_context; raw_context.rdx = 12345; ExploitabilityLinuxTestMinidumpContext context(raw_context); ASSERT_EQ(context.GetContextAMD64()->rdx, 12345U); ASSERT_FALSE(ExploitabilityLinuxTest::CalculateAddress("", context, NULL)); uint64_t write_address = 0; ASSERT_TRUE(ExploitabilityLinuxTest::CalculateAddress("rdx-0x4D2", context, &write_address)); ASSERT_EQ(write_address, 11111U); ASSERT_TRUE(ExploitabilityLinuxTest::CalculateAddress("rdx+0x4D2", context, &write_address)); ASSERT_EQ(write_address, 13579U); ASSERT_FALSE(ExploitabilityLinuxTest::CalculateAddress("rdx+rax", context, &write_address)); ASSERT_FALSE(ExploitabilityLinuxTest::CalculateAddress("0x3482+0x4D2", context, &write_address)); } #endif // _WIN32 } // namespace