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new method for validating the loaded ELF file

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Martin Bickel 2016-12-28 18:28:35 +01:00 committed by Serge Lamikhov-Center
parent d0cb172474
commit fb5ec079ba
1 changed files with 39 additions and 0 deletions
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39
elfio/elfio.hpp
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@ -246,6 +246,45 @@ class elfio
}
}
//------------------------------------------------------------------------------
private:
bool is_offset_in_section( Elf64_Off offset, const section* sec ) const {
return offset >= sec->get_offset() && offset < sec->get_offset()+sec->get_size();
}
//------------------------------------------------------------------------------
public:
//! returns an empty string if no problems are detected,
//! or a string containing an error message if problems are found
std::string validate() const {
// check for overlapping sections in the file
for ( int i = 0; i < sections.size(); ++i) {
for ( int j = i+1; j < sections.size(); ++j ) {
const section* a = sections[i];
const section* b = sections[j];
if ( !(a->get_type() & SHT_NOBITS)
&& !(b->get_type() & SHT_NOBITS)
&& (a->get_size() > 0)
&& (b->get_size() > 0)
&& (a->get_offset() > 0)
&& (b->get_offset() > 0)) {
if ( is_offset_in_section( a->get_offset(), b )
|| is_offset_in_section( a->get_offset()+a->get_size()-1, b )
|| is_offset_in_section( b->get_offset(), a )
|| is_offset_in_section( b->get_offset()+b->get_size()-1, a )) {
return "Sections " + a->get_name() + " and " + b->get_name() + " overlap in file";
}
}
}
}
// more checks to be added here...
return "";
}
//------------------------------------------------------------------------------
private:
//------------------------------------------------------------------------------