a840e1b710
If the minidump module containing the instruction pointer has memory containing the ELF header and program header table, when checking the exploitability rating, the processor will use the ELF header data to determine if the instruction pointer lies in an executable region of the module, rather than just checking if it lies in a module. R=ivanpe@chromium.org Review URL: https://codereview.chromium.org/1233973002 git-svn-id: http://google-breakpad.googlecode.com/svn/trunk@1472 4c0a9323-5329-0410-9bdc-e9ce6186880e
117 lines
4.5 KiB
C++
117 lines
4.5 KiB
C++
// Copyright (c) 2013 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_linux.h: Linux specific exploitability engine.
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//
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// Provides a guess at the exploitability of the crash for the Linux
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// platform given a minidump and process_state.
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//
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// Author: Matthew Riley
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#ifndef GOOGLE_BREAKPAD_PROCESSOR_EXPLOITABILITY_LINUX_H_
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#define GOOGLE_BREAKPAD_PROCESSOR_EXPLOITABILITY_LINUX_H_
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#include "common/scoped_ptr.h"
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#include "google_breakpad/common/breakpad_types.h"
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#include "google_breakpad/processor/exploitability.h"
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namespace google_breakpad {
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enum LinuxArchitectureType {
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// A 32-bit Linux architecture.
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LINUX_32_BIT,
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// A 64-bit Linux architecture.
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LINUX_64_BIT,
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// Some other architecture that is not Linux.
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UNSUPPORTED_ARCHITECTURE
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};
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class ExploitabilityLinux : public Exploitability {
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public:
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ExploitabilityLinux(Minidump *dump,
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ProcessState *process_state);
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virtual ExploitabilityRating CheckPlatformExploitability();
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private:
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// This method takes the address of the instruction pointer and returns
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// whether the instruction pointer lies in a valid instruction region.
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bool InstructionPointerInCode(uint64_t instruction_ptr);
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// This method checks the exception that triggered the creation of the
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// minidump and reports whether the exception suggests no exploitability.
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bool BenignCrashTrigger(const MDRawExceptionStream *raw_exception_stream);
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// Checks if the minidump architecture is 32-bit or 64-bit.
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LinuxArchitectureType ArchitectureType();
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// Loads ELF header data of the module present in the given memory
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// region into the scoped pointer.
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// This method takes a scoped pointer in which the ELF header data is
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// loaded, the memory region containing the ELF header, and the base
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// address of the ELF header.
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template<typename T>
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void LoadElfHeader(MinidumpMemoryRegion *memory,
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uint64_t base_address,
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T *header) {
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for (size_t i = 0; i < sizeof(T); i++) {
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uint8_t my_byte = 0;
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memory->GetMemoryAtAddress(base_address + i, &my_byte);
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*(reinterpret_cast<char *>(header) + i) = my_byte;
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}
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}
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// Loads the Program Header Table of the module present in the given
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// memory region into the scoped array.
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// This method takes a scoped array in which the header table data is
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// loaded, the memory region containing the table, the base address of
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// the program header table, and the number of entries in the table.
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template<typename T>
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void LoadElfHeaderTable(MinidumpMemoryRegion *memory,
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uint64_t base_address,
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uint16_t e_phnum,
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T table[]) {
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uint64_t offset = 0;
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for (size_t i = 0; i < e_phnum; i++) {
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T *entry = &table[i];
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for (size_t j = 0; j < sizeof(T); j++) {
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uint8_t my_byte = 0;
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memory->GetMemoryAtAddress(base_address + offset++, &my_byte);
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*(reinterpret_cast<char *>(entry) + j) = my_byte;
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}
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}
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}
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};
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} // namespace google_breakpad
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#endif // GOOGLE_BREAKPAD_PROCESSOR_EXPLOITABILITY_LINUX_H_
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