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An attempt to implement memory translation for sections

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This commit is contained in:
Serge Lamikhov-Center 2021-09-19 08:02:58 +03:00
parent 0a15ec0aea
commit b527ea992a
4 changed files with 17 additions and 10 deletions
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3
.vscode/launch.json vendored
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@ -58,6 +58,7 @@
"2919", "2919",
"/usr/bin/bash" "/usr/bin/bash"
], ],
"sudo" : true,
"stopAtEntry": false, "stopAtEntry": false,
"cwd": "${workspaceFolder}", "cwd": "${workspaceFolder}",
"environment": [], "environment": [],
@ -70,7 +71,7 @@
"ignoreFailures": true "ignoreFailures": true
} }
], ],
"miDebuggerPath": "/usr/bin/gdb" "miDebuggerPath": "/home/user/ELFIO/mygdb.sh"
} }
] ]
} }

6
elfio/elfio.hpp
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@ -421,10 +421,12 @@ class elfio
unsigned char file_class = get_class(); unsigned char file_class = get_class();
if ( file_class == ELFCLASS64 ) { if ( file_class == ELFCLASS64 ) {
new_section = new section_impl<Elf64_Shdr>( &convertor ); new_section =
new section_impl<Elf64_Shdr>( &convertor, &addr_translator );
} }
else if ( file_class == ELFCLASS32 ) { else if ( file_class == ELFCLASS32 ) {
new_section = new section_impl<Elf32_Shdr>( &convertor ); new_section =
new section_impl<Elf32_Shdr>( &convertor, &addr_translator );
} }
else { else {
return nullptr; return nullptr;

15
elfio/elfio_section.hpp
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@ -72,8 +72,9 @@ template <class T> class section_impl : public section
{ {
public: public:
//------------------------------------------------------------------------------ //------------------------------------------------------------------------------
section_impl( const endianess_convertor* convertor ) section_impl( const endianess_convertor* convertor,
: convertor( convertor ) const address_translator* translator )
: convertor( convertor ), translator( translator )
{ {
std::fill_n( reinterpret_cast<char*>( &header ), sizeof( header ), std::fill_n( reinterpret_cast<char*>( &header ), sizeof( header ),
'\0' ); '\0' );
@ -192,10 +193,10 @@ template <class T> class section_impl : public section
std::fill_n( reinterpret_cast<char*>( &header ), sizeof( header ), std::fill_n( reinterpret_cast<char*>( &header ), sizeof( header ),
'\0' ); '\0' );
stream.seekg( 0, stream.end ); // stream.seekg( 0, stream.end );
set_stream_size( stream.tellg() ); set_stream_size( 0xFFFFFFFF /*stream.tellg()*/ );
stream.seekg( header_offset ); stream.seekg( ( *translator )( header_offset ) );
stream.read( reinterpret_cast<char*>( &header ), sizeof( header ) ); stream.read( reinterpret_cast<char*>( &header ), sizeof( header ) );
Elf_Xword size = get_size(); Elf_Xword size = get_size();
@ -204,7 +205,8 @@ template <class T> class section_impl : public section
data = new ( std::nothrow ) char[size + 1]; data = new ( std::nothrow ) char[size + 1];
if ( ( 0 != size ) && ( nullptr != data ) ) { if ( ( 0 != size ) && ( nullptr != data ) ) {
stream.seekg( ( *convertor )( header.sh_offset ) ); stream.seekg(
( *translator )( ( *convertor )( header.sh_offset ) ) );
stream.read( data, size ); stream.read( data, size );
data[size] = 0; // Ensure data is ended with 0 to avoid oob read data[size] = 0; // Ensure data is ended with 0 to avoid oob read
data_size = size; data_size = size;
@ -263,6 +265,7 @@ template <class T> class section_impl : public section
char* data; char* data;
Elf_Word data_size; Elf_Word data_size;
const endianess_convertor* convertor; const endianess_convertor* convertor;
const address_translator* translator;
bool is_address_set; bool is_address_set;
size_t stream_size; size_t stream_size;
}; };

3
elfio/elfio_utils.hpp
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@ -190,7 +190,8 @@ class address_translator
for ( auto& t : translation ) { for ( auto& t : translation ) {
if ( t.map_to <= value && if ( t.map_to <= value &&
( ( value - t.map_to ) < ( t.end - t.start ) ) ) { ( ( value - t.map_to ) < ( t.end - t.start ) ) ) {
std::cout << std::hex << t.start - t.map_to + value << std::endl; std::cout << std::hex << t.start - t.map_to + value << " "
<< value << std::endl;
return t.start - t.map_to + value; return t.start - t.map_to + value;
} }
} }