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LibELF: Fix support for relocating weak symbols

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Having unresolved weak symbols is allowed and we should initialize
them to zero.
This commit is contained in:
Gunnar Beutner 2021-04-19 11:39:31 +02:00 • committed by Andreas Kling
parent 97d7450571
commit 1dab5ca5fd
2 changed files with 20 additions and 10 deletions
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23
Userland/Libraries/LibELF/DynamicLoader.cpp
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@ -211,7 +211,7 @@ bool DynamicLoader::load_stage_2(unsigned flags, size_t total_tls_size)
void DynamicLoader::do_main_relocations(size_t total_tls_size)
{
auto do_single_relocation = [&](const ELF::DynamicObject::Relocation& relocation) {
switch (do_relocation(total_tls_size, relocation)) {
switch (do_relocation(total_tls_size, relocation, ShouldInitializeWeak::No)) {
case RelocationResult::Failed:
dbgln("Loader.so: {} unresolved symbol '{}'", m_filename, relocation.symbol().name());
VERIFY_NOT_REACHED();
@ -267,7 +267,7 @@ void DynamicLoader::load_stage_4()
void DynamicLoader::do_lazy_relocations(size_t total_tls_size)
{
for (const auto& relocation : m_unresolved_relocations) {
if (auto res = do_relocation(total_tls_size, relocation); res != RelocationResult::Success) {
if (auto res = do_relocation(total_tls_size, relocation, ShouldInitializeWeak::Yes); res != RelocationResult::Success) {
dbgln("Loader.so: {} unresolved symbol '{}'", m_filename, relocation.symbol().name());
VERIFY_NOT_REACHED();
}
@ -424,7 +424,7 @@ void DynamicLoader::load_program_headers()
// FIXME: Initialize the values in the TLS section. Currently, it is zeroed.
}
DynamicLoader::RelocationResult DynamicLoader::do_relocation(size_t total_tls_size, const ELF::DynamicObject::Relocation& relocation)
DynamicLoader::RelocationResult DynamicLoader::do_relocation(size_t total_tls_size, const ELF::DynamicObject::Relocation& relocation, ShouldInitializeWeak should_initialize_weak)
{
FlatPtr* patch_ptr = nullptr;
if (is_dynamic())
@ -462,14 +462,19 @@ DynamicLoader::RelocationResult DynamicLoader::do_relocation(size_t total_tls_si
case R_386_GLOB_DAT: {
auto symbol = relocation.symbol();
auto res = lookup_symbol(symbol);
VirtualAddress symbol_location;
if (!res.has_value()) {
if (symbol.bind() == STB_WEAK)
return RelocationResult::ResolveLater;
if (symbol.bind() == STB_WEAK) {
if (should_initialize_weak == ShouldInitializeWeak::No)
return RelocationResult::ResolveLater;
} else {
// Symbol not found
return RelocationResult::Failed;
}
// Symbol not found
return RelocationResult::Failed;
}
auto symbol_location = res.value().address;
symbol_location = VirtualAddress { (FlatPtr)0 };
} else
symbol_location = res.value().address;
VERIFY(symbol_location != m_dynamic_object->base_address());
*patch_ptr = symbol_location.get();
break;