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breakpad/src/processor/exploitability_unittest.cc

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// 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 <stdlib.h>
#include <unistd.h>
#include <string>
#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 <srcdir>/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_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
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