311 lines
12 KiB
C++
311 lines
12 KiB
C++
/*
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Copyright (C) 2001-present by Serge Lamikhov-Center
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Permission is hereby granted, free of charge, to any person obtaining a copy
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of this software and associated documentation files (the "Software"), to deal
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in the Software without restriction, including without limitation the rights
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to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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copies of the Software, and to permit persons to whom the Software is
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furnished to do so, subject to the following conditions:
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The above copyright notice and this permission notice shall be included in
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all copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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THE SOFTWARE.
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*/
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#ifndef ELFIO_VERSYM_HPP
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#define ELFIO_VERSYM_HPP
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namespace ELFIO {
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//------------------------------------------------------------------------------
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//! \class versym_section_accessor_template
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//! \brief Class for accessing version symbol section data
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template <class S> class versym_section_accessor_template
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{
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public:
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//------------------------------------------------------------------------------
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//! \brief Constructor
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//! \param section Pointer to the section
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explicit versym_section_accessor_template( S* section )
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: versym_section( section )
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{
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if ( section != nullptr ) {
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entries_num = decltype( entries_num )( section->get_size() /
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sizeof( Elf_Half ) );
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}
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}
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//------------------------------------------------------------------------------
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//! \brief Get the number of entries
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//! \return Number of entries
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Elf_Word get_entries_num() const
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{
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if ( versym_section ) {
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return entries_num;
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}
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return 0;
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}
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//------------------------------------------------------------------------------
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//! \brief Get an entry
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//! \param no Index of the entry
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//! \param value Value of the entry
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//! \return True if successful, false otherwise
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bool get_entry( Elf_Word no, Elf_Half& value ) const
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{
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if ( versym_section && ( no < get_entries_num() ) ) {
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value = ( (Elf_Half*)versym_section->get_data() )[no];
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return true;
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}
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return false;
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}
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//------------------------------------------------------------------------------
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//! \brief Modify an entry
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//! \param no Index of the entry
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//! \param value New value of the entry
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//! \return True if successful, false otherwise
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bool modify_entry( Elf_Word no, Elf_Half value )
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{
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if ( versym_section && ( no < get_entries_num() ) ) {
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( (Elf_Half*)versym_section->get_data() )[no] = value;
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return true;
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}
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return false;
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}
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//------------------------------------------------------------------------------
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//! \brief Add an entry
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//! \param value Value of the entry
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//! \return True if successful, false otherwise
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bool add_entry( Elf_Half value )
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{
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if ( !versym_section ) {
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return false;
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}
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versym_section->append_data( (const char*)&value, sizeof( Elf_Half ) );
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++entries_num;
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return true;
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}
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//------------------------------------------------------------------------------
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private:
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S* versym_section = nullptr; //!< Pointer to the section
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Elf_Word entries_num = 0; //!< Number of entries
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};
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using versym_section_accessor = versym_section_accessor_template<section>;
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using const_versym_section_accessor =
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versym_section_accessor_template<const section>;
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//------------------------------------------------------------------------------
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//! \class versym_r_section_accessor_template
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//! \brief Class for accessing version requirement section data
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template <class S> class versym_r_section_accessor_template
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{
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public:
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//------------------------------------------------------------------------------
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//! \brief Constructor
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//! \param elf_file Reference to the ELF file
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//! \param versym_r_section Pointer to the version requirement section
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versym_r_section_accessor_template( const elfio& elf_file,
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S* versym_r_section )
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: elf_file( elf_file ), versym_r_section( versym_r_section ),
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entries_num( 0 )
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{
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// Find .dynamic section
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const section* dynamic_section = elf_file.sections[".dynamic"];
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if ( dynamic_section == nullptr ) {
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return;
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}
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const_dynamic_section_accessor dynamic_section_acc( elf_file,
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dynamic_section );
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Elf_Xword dyn_sec_num = dynamic_section_acc.get_entries_num();
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for ( Elf_Xword i = 0; i < dyn_sec_num; ++i ) {
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Elf_Xword tag;
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Elf_Xword value;
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std::string str;
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if ( dynamic_section_acc.get_entry( i, tag, value, str ) &&
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tag == DT_VERNEEDNUM ) {
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entries_num = (Elf_Word)value;
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break;
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}
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}
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}
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//------------------------------------------------------------------------------
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//! \brief Get the number of entries
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//! \return Number of entries
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Elf_Word get_entries_num() const { return entries_num; }
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//------------------------------------------------------------------------------
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//! \brief Get an entry
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//! \param no Index of the entry
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//! \param version Version of the entry
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//! \param file_name File name of the entry
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//! \param hash Hash of the entry
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//! \param flags Flags of the entry
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//! \param other Other information of the entry
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//! \param dep_name Dependency name of the entry
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//! \return True if successful, false otherwise
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bool get_entry( Elf_Word no,
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Elf_Half& version,
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std::string& file_name,
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Elf_Word& hash,
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Elf_Half& flags,
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Elf_Half& other,
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std::string& dep_name ) const
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{
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if ( versym_r_section == nullptr || ( no >= get_entries_num() ) ) {
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return false;
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}
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const_string_section_accessor string_section_acc(
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elf_file.sections[versym_r_section->get_link()] );
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Elfxx_Verneed* verneed = (Elfxx_Verneed*)versym_r_section->get_data();
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Elfxx_Vernaux* veraux =
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(Elfxx_Vernaux*)( (char*)verneed + verneed->vn_aux );
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for ( Elf_Word i = 0; i < no; ++i ) {
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verneed = (Elfxx_Verneed*)( (char*)verneed + verneed->vn_next );
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veraux = (Elfxx_Vernaux*)( (char*)verneed + verneed->vn_aux );
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}
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version = verneed->vn_version;
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file_name = string_section_acc.get_string( verneed->vn_file );
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hash = veraux->vna_hash;
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flags = veraux->vna_flags;
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other = veraux->vna_other;
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dep_name = string_section_acc.get_string( veraux->vna_name );
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return true;
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}
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//------------------------------------------------------------------------------
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private:
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const elfio& elf_file;
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S* versym_r_section =
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nullptr; //!< Pointer to the version requirement section
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Elf_Word entries_num = 0; //!< Number of entries
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};
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using versym_r_section_accessor = versym_r_section_accessor_template<section>;
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using const_versym_r_section_accessor =
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versym_r_section_accessor_template<const section>;
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//------------------------------------------------------------------------------
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//! \class versym_d_section_accessor_template
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//! \brief Class for accessing version definition section data
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template <class S> class versym_d_section_accessor_template
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{
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public:
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//------------------------------------------------------------------------------
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//! \brief Constructor
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//! \param elf_file Reference to the ELF file
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//! \param versym_d_section Pointer to the version definition section
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versym_d_section_accessor_template( const elfio& elf_file,
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S* versym_d_section )
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: elf_file( elf_file ), versym_d_section( versym_d_section ),
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entries_num( 0 )
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{
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// Find .dynamic section
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const section* dynamic_section = elf_file.sections[".dynamic"];
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if ( dynamic_section == nullptr ) {
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return;
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}
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const_dynamic_section_accessor dynamic_section_acc( elf_file,
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dynamic_section );
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Elf_Xword dyn_sec_num = dynamic_section_acc.get_entries_num();
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for ( Elf_Xword i = 0; i < dyn_sec_num; ++i ) {
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Elf_Xword tag;
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Elf_Xword value;
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std::string str;
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if ( dynamic_section_acc.get_entry( i, tag, value, str ) &&
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tag == DT_VERDEFNUM ) {
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entries_num = (Elf_Word)value;
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break;
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}
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}
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}
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//------------------------------------------------------------------------------
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//! \brief Get the number of entries
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//! \return Number of entries
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Elf_Word get_entries_num() const { return entries_num; }
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//------------------------------------------------------------------------------
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//! \brief Get an entry
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//! \param no Index of the entry
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//! \param flags Flags of the entry
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//! \param version_index Version index of the entry
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//! \param hash Hash of the entry
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//! \param dep_name Dependency name of the entry
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//! \return True if successful, false otherwise
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bool get_entry( Elf_Word no,
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Elf_Half& flags,
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Elf_Half& version_index,
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Elf_Word& hash,
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std::string& dep_name ) const
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{
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if ( versym_d_section == nullptr || ( no >= get_entries_num() ) ) {
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return false;
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}
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const_string_section_accessor string_section_acc(
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elf_file.sections[versym_d_section->get_link()] );
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Elfxx_Verdef* verdef = (Elfxx_Verdef*)versym_d_section->get_data();
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Elfxx_Verdaux* verdaux =
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(Elfxx_Verdaux*)( (char*)verdef + verdef->vd_aux );
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for ( Elf_Word i = 0; i < no; ++i ) {
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verdef = (Elfxx_Verdef*)( (char*)verdef + verdef->vd_next );
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verdaux = (Elfxx_Verdaux*)( (char*)verdef + verdef->vd_aux );
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}
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// verdef->vd_version should always be 1
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// see https://refspecs.linuxfoundation.org/LSB_3.0.0/LSB-PDA/LSB-PDA.junk/symversion.html#VERDEFENTRIES
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// verdef->vd_cnt should always be 1.
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// see https://maskray.me/blog/2020-11-26-all-about-symbol-versioning
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flags = verdef->vd_flags;
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version_index = verdef->vd_ndx;
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hash = verdef->vd_hash;
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dep_name = string_section_acc.get_string( verdaux->vda_name );
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return true;
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}
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//------------------------------------------------------------------------------
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private:
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const elfio& elf_file;
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S* versym_d_section =
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nullptr; //!< Pointer to the version definition section
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Elf_Word entries_num = 0; //!< Number of entries
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};
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using versym_d_section_accessor = versym_d_section_accessor_template<section>;
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using const_versym_d_section_accessor =
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versym_d_section_accessor_template<const section>;
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} // namespace ELFIO
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#endif // ELFIO_VERSYM_HPP
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