system/serenity
system/serenity
1
0
Fork 0
mirror of https://github.com/SerenityOS/serenity synced 2024-09-06 08:56:40 +00:00
Code Issues Packages Projects Releases Wiki Activity

LibELF: Calculate size of relocation table correctly in all cases

Browse source 
RELASZ might include the PLT table as well. Check if that is the case
and correct the size of the non-PLT relocation table.
This commit is contained in:
Sönke Holz 2023-09-09 21:04:00 +02:00 committed by Tim Schumacher
parent 968038aa79
commit c42e8ddc48
1 changed files with 13 additions and 0 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

13
Userland/Libraries/LibELF/DynamicObject.cpp
View file

@ -202,6 +202,19 @@ void DynamicObject::parse()
m_size_of_relocation_entry = sizeof(ElfW(Rel));
}
// Whether or not RELASZ (stored in m_size_of_relocation_table) only refers to non-PLT entries is not clearly specified.
// So check if [JMPREL, JMPREL+PLTRELSZ) is in [RELA, RELA+RELASZ).
// If so, change the size of the non-PLT relocation table.
if (m_plt_relocation_offset_location >= m_relocation_table_offset // JMPREL >= RELA
&& m_plt_relocation_offset_location < (m_relocation_table_offset + m_size_of_relocation_table)) { // JMPREL < (RELA + RELASZ)
// [JMPREL, JMPREL+PLTRELSZ) is in [RELA, RELA+RELASZ)
// Verify that the ends of the tables match up
VERIFY(m_plt_relocation_offset_location + m_size_of_plt_relocation_entry_list == m_relocation_table_offset + m_size_of_relocation_table);
m_size_of_relocation_table -= m_size_of_plt_relocation_entry_list;
}
auto hash_section_address = hash_section().address().as_ptr();
// TODO: consider base address - it might not be zero
auto num_hash_chains = ((u32*)hash_section_address)[1];