I am difficulty determining the location of the segfault in the
following code:
boost::uint32_t reserve_length = 0;
std::ifstream file_handle_ref ( name.c_str(),
std::ios::binary | std::ios::in );
if ( ! file_handle_ref.is_open() ) // Expecting result of is_open() to be true
{
std::cerr << "Error opening " << name << std::endl;
std::cerr << " " << strerror(errno) << std::endl;
std::cerr << boost::format("Exception throw in %s at line %d")
% __FILE__
% __LINE__
<< std::endl;
throw errors::IO_Exception
(errors::IO_Exception::FATAL_IO_ERROR);
}
file_handle_ref.seekg( 0, std::ios::end );
reserve_length = file_handle_ref.tellg();
std::cout << "Reserve length = " << reserve_length << std::endl;
<SEGFAULT>
std::cout << boost::format ("reserve_length (method 1) = %d") % reserve_length << std::endl;
</SEGFAULT>
==452== Invalid read of size 4
==452== at 0x480228C3: std::ostreambuf_iterator std::num_put >::_M_insert_int<unsigned long>(std::ostreambuf_iterator, std::ios_base&, char, unsigned long) const (in /usr/lib/libstdc++.so.6.0.8)
==452== by 0x48022BAF: std::num_put >::do_put(std::ostreambuf_iterator, std::ios_base&, char, unsigned long) const (in /usr/lib/libstdc++.so.6.0.8)
==452== by 0x4802B63C: std::ostream::operator<<(unsigned) (in /usr/lib/libstdc++.so.6.0.8)
==452== by 0x4197E59: void boost::io::detail::put_last(std::basic_ostream&, unsigned&) (feed_args.hpp:113)
==452== by 0x4197F85: void boost::io::detail::put(unsigned&, boost::io::detail::format_item const&, boost::basic_format::string_type&, std::char_traits<char>::internal_streambuf_t&, std::locale*) (feed_args.hpp:150)
==452== by 0x4198724: void boost::io::detail::distribute(boost::basic_format&, unsigned&) (feed_args.hpp:241)
==452== by 0x4198783: boost::basic_format& boost::io::detail::feed(boost::basic_format&, unsigned&) (feed_args.hpp:251)
==452== by 0x4198849: boost::basic_format& boost::basic_format::operator%<unsigned>(unsigned&) (format_class.hpp:68)
==452== by 0x41940EE: libreverse::data_container::Memory_Map::Memory_Map(std::string, unsigned) (Memory_Map.cpp:87)
==452== by 0x41D2D85: libreverse::io::File::read_Image() (File.cpp:119)
==452== by 0x41D30F1: libreverse::io::File::init() (File.cpp:151)
==452== by 0x8089A2B: libreverse::wpef_module::PE_File<32>::init() (PE_File_T.cpp:48)
==452== Address 0x30 is not stack'd, malloc'd or (recently) free'd
==452==
I made a driver program for this line. The driver works fine.
#include
#include
#include <iostream>
#include <fstream>
int main (int, char**)
{
boost::uint32_t reserve_length = 0;
std::ifstream input_ref ( "kernel32.dll", std::ios::binary |
std::ios::in );
input_ref.seekg ( 0, std::ios::end );
reserve_length = input_ref.tellg();
std::cout << boost::format("Something done %d") %
reserve_length << std::endl;
}
So I cannot provide you an easy example. I am sorry about this. I hope I
am asking an intelligent question.
Stephen
