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breakpad/src/processor/exploitability_unittest.cc
Liu.andrew.x@gmail.com f073540795 Add check for Linux minidump ending on bad write for exploitability rating. 
If a crash occurred as a result to a write to unwritable memory, it is reason
to suggest exploitability. The processor checks for a bad write by
disassembling the command that caused the crash by piping the raw bytes near
the instruction pointer through objdump. This allows the processor to see if
the instruction that caused the crash is a write to memory and where the
target of the address is located.

R=ivanpe@chromium.org

Review URL: https://codereview.chromium.org/1273823004

git-svn-id: http://google-breakpad.googlecode.com/svn/trunk@1497 4c0a9323-5329-0410-9bdc-e9ce6186880e
2015-08-21 16:22:19 +00:00

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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::DisassembleBytes;
using ExploitabilityLinux::TokenizeObjdumpInstruction;
using ExploitabilityLinux::CalculateAddress;
};
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("0:") == string::npos) && getline(objdump_stream, line)) {
}
ASSERT_EQ(line, " 0:\tc7 00 05 00 00 00 \tmov DWORD PTR [rax],0x5");
}
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, 12345);
ASSERT_FALSE(ExploitabilityLinuxTest::CalculateAddress("", context, NULL));
uint64_t write_address = 0;
ASSERT_TRUE(ExploitabilityLinuxTest::CalculateAddress("rdx-0x4D2",
context,
&write_address));
ASSERT_EQ(write_address, 11111);
ASSERT_TRUE(ExploitabilityLinuxTest::CalculateAddress("rdx+0x4D2",
context,
&write_address));
ASSERT_EQ(write_address, 13579);
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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