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// Copyright (c) 2013 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.
// exploitability_linux.h: Linux specific exploitability engine.
//
// Provides a guess at the exploitability of the crash for the Linux
// platform given a minidump and process_state.
//
// Author: Matthew Riley
#ifndef GOOGLE_BREAKPAD_PROCESSOR_EXPLOITABILITY_LINUX_H_
#define GOOGLE_BREAKPAD_PROCESSOR_EXPLOITABILITY_LINUX_H_
#include "common/scoped_ptr.h"
#include "google_breakpad/common/breakpad_types.h"
#include "google_breakpad/processor/exploitability.h"
namespace google_breakpad {
enum LinuxArchitectureType {
// A 32-bit Linux architecture.
LINUX_32_BIT,
// A 64-bit Linux architecture.
LINUX_64_BIT,
// Some other architecture that is not Linux.
UNSUPPORTED_ARCHITECTURE
};
class ExploitabilityLinux : public Exploitability {
public:
ExploitabilityLinux(Minidump *dump,
ProcessState *process_state);
virtual ExploitabilityRating CheckPlatformExploitability();
private:
// This method takes the address of the instruction pointer and returns
// whether the instruction pointer lies in a valid instruction region.
bool InstructionPointerInCode(uint64_t instruction_ptr);
// This method checks the exception that triggered the creation of the
// minidump and reports whether the exception suggests no exploitability.
bool BenignCrashTrigger(const MDRawExceptionStream *raw_exception_stream);
// Checks if the minidump architecture is 32-bit or 64-bit.
LinuxArchitectureType ArchitectureType();
// Loads ELF header data of the module present in the given memory
// region into the scoped pointer.
// This method takes a scoped pointer in which the ELF header data is
// loaded, the memory region containing the ELF header, and the base
// address of the ELF header.
template<typename T>
void LoadElfHeader(MinidumpMemoryRegion *memory,
uint64_t base_address,
T *header) {
for (size_t i = 0; i < sizeof(T); i++) {
uint8_t my_byte = 0;
memory->GetMemoryAtAddress(base_address + i, &my_byte);
*(reinterpret_cast<char *>(header) + i) = my_byte;
}
}
// Loads the Program Header Table of the module present in the given
// memory region into the scoped array.
// This method takes a scoped array in which the header table data is
// loaded, the memory region containing the table, the base address of
// the program header table, and the number of entries in the table.
template<typename T>
void LoadElfHeaderTable(MinidumpMemoryRegion *memory,
uint64_t base_address,
uint16_t e_phnum,
T table[]) {
uint64_t offset = 0;
for (size_t i = 0; i < e_phnum; i++) {
T *entry = &table[i];
for (size_t j = 0; j < sizeof(T); j++) {
uint8_t my_byte = 0;
memory->GetMemoryAtAddress(base_address + offset++, &my_byte);
*(reinterpret_cast<char *>(entry) + j) = my_byte;
}
}
}
};
} // namespace google_breakpad
#endif // GOOGLE_BREAKPAD_PROCESSOR_EXPLOITABILITY_LINUX_H_
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