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vmdevirt/src/devirt_utils.cpp

68 lines
3.1 KiB

#include <devirt_utils.hpp>
namespace devirt
{
namespace util
{
bool serialize_vmp2(
std::vector< std::pair< std::uint32_t, std::vector< vm::instrs::code_block_t > > > &virt_rtns,
std::vector< std::uint8_t > &vmp2file )
{
const auto file_header = reinterpret_cast< vmp2::v4::file_header * >( vmp2file.data() );
if ( file_header->version != vmp2::version_t::v4 )
{
std::printf( "[!] invalid vmp2 file version... this build uses v3...\n" );
return false;
}
auto first_rtn = reinterpret_cast< vmp2::v4::rtn_t * >( reinterpret_cast< std::uintptr_t >( file_header ) +
file_header->rtn_offset );
for ( auto [ rtn_block, rtn_idx ] = std::pair{ first_rtn, 0ull }; rtn_idx < file_header->rtn_count;
++rtn_idx, rtn_block = reinterpret_cast< vmp2::v4::rtn_t * >(
reinterpret_cast< std::uintptr_t >( rtn_block ) + rtn_block->size ) )
{
virt_rtns.push_back( { rtn_block->vm_enter_offset, {} } );
for ( auto [ code_block, block_idx ] = std::pair{ &rtn_block->code_blocks[ 0 ], 0ull };
block_idx < rtn_block->code_block_count;
++block_idx, code_block = reinterpret_cast< vmp2::v4::code_block_t * >(
reinterpret_cast< std::uintptr_t >( code_block ) +
code_block->next_block_offset ) )
{
auto block_vinstrs = reinterpret_cast< vm::instrs::virt_instr_t * >(
reinterpret_cast< std::uintptr_t >( code_block ) + sizeof vmp2::v4::code_block_t +
( code_block->num_block_addrs * 8 ) );
vm::instrs::code_block_t _code_block{ code_block->vip_begin };
_code_block.jcc.has_jcc = code_block->has_jcc;
_code_block.jcc.type = code_block->jcc_type;
for ( auto idx = 0u; idx < code_block->num_block_addrs; ++idx )
_code_block.jcc.block_addr.push_back( code_block->branch_addr[ idx ] );
for ( auto idx = 0u; idx < code_block->vinstr_count; ++idx )
_code_block.vinstrs.push_back( block_vinstrs[ idx ] );
virt_rtns.back().second.push_back( _code_block );
}
}
return true;
}
} // namespace util
bool append( std::vector< std::uint8_t > &obj, std::vector< std::uint8_t > &bin )
{
if ( obj.empty() || bin.empty() )
return false;
// TODO: append a new section to the pe file...
// put the entire obj file into this new section...
// fix up the vmenter functions to jmp to their respective devirtualized routines...
//
// move relocation directory to the end of the module and append new relocations...
// export all of the new devirtualized/llvm generated functions...
return true;
}
} // namespace devirt