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f073540795
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
120 lines
3.9 KiB
C++
120 lines
3.9 KiB
C++
// Copyright (c) 2010 Google Inc.
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// All rights reserved.
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//
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// Redistribution and use in source and binary forms, with or without
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// modification, are permitted provided that the following conditions are
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// met:
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//
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// * Redistributions of source code must retain the above copyright
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// notice, this list of conditions and the following disclaimer.
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// * Redistributions in binary form must reproduce the above
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// copyright notice, this list of conditions and the following disclaimer
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// in the documentation and/or other materials provided with the
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// distribution.
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// * Neither the name of Google Inc. nor the names of its
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// contributors may be used to endorse or promote products derived from
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// this software without specific prior written permission.
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//
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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// exploitability_engine.cc: Generic exploitability engine.
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//
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// See exploitable_engine.h for documentation.
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//
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// Author: Cris Neckar
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#include <cassert>
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#include "common/scoped_ptr.h"
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#include "google_breakpad/processor/exploitability.h"
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#include "google_breakpad/processor/minidump.h"
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#include "google_breakpad/processor/process_state.h"
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#include "processor/exploitability_linux.h"
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#include "processor/exploitability_win.h"
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#include "processor/logging.h"
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namespace google_breakpad {
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Exploitability::Exploitability(Minidump *dump,
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ProcessState *process_state)
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: dump_(dump),
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process_state_(process_state) {}
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ExploitabilityRating Exploitability::CheckExploitability() {
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return CheckPlatformExploitability();
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}
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Exploitability *Exploitability::ExploitabilityForPlatform(
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Minidump *dump,
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ProcessState *process_state) {
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return ExploitabilityForPlatform(dump, process_state, false);
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}
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Exploitability *Exploitability::ExploitabilityForPlatform(
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Minidump *dump,
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ProcessState *process_state,
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bool enable_objdump) {
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Exploitability *platform_exploitability = NULL;
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MinidumpSystemInfo *minidump_system_info = dump->GetSystemInfo();
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if (!minidump_system_info)
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return NULL;
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const MDRawSystemInfo *raw_system_info =
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minidump_system_info->system_info();
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if (!raw_system_info)
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return NULL;
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switch (raw_system_info->platform_id) {
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case MD_OS_WIN32_NT:
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case MD_OS_WIN32_WINDOWS: {
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platform_exploitability = new ExploitabilityWin(dump, process_state);
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break;
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}
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case MD_OS_LINUX: {
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platform_exploitability = new ExploitabilityLinux(dump,
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process_state,
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enable_objdump);
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break;
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}
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case MD_OS_MAC_OS_X:
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case MD_OS_IOS:
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case MD_OS_UNIX:
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case MD_OS_SOLARIS:
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case MD_OS_ANDROID:
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case MD_OS_PS3:
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default: {
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platform_exploitability = NULL;
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break;
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}
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}
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BPLOG_IF(ERROR, !platform_exploitability) <<
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"No Exploitability module for platform: " <<
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process_state->system_info()->os;
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return platform_exploitability;
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}
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bool Exploitability::AddressIsAscii(uint64_t address) {
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for (int i = 0; i < 8; i++) {
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uint8_t byte = (address >> (8*i)) & 0xff;
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if ((byte >= ' ' && byte <= '~') || byte == 0)
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continue;
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return false;
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}
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return true;
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}
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} // namespace google_breakpad
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