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LibELF: Fix relocation support for 'static __thread' variables

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Gunnar Beutner 2021-07-04 00:05:59 +02:00 committed by Andreas Kling
parent 5f6ee4c539
commit 251eaad8f0
Notes: sideshowbarker 2024-07-18 10:31:43 +09:00 
Author: https://github.com/gunnarbeutner
Commit: https://github.com/SerenityOS/serenity/commit/251eaad8f01
Pull-request: https://github.com/SerenityOS/serenity/pull/8414
1 changed files with 14 additions and 8 deletions
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22
Userland/Libraries/LibELF/DynamicLoader.cpp
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@ -482,15 +482,21 @@ DynamicLoader::RelocationResult DynamicLoader::do_relocation(const ELF::DynamicO
case R_X86_64_TPOFF64: {
#endif
auto symbol = relocation.symbol();
// For some reason, LibC has a R_386_TLS_TPOFF that refers to the undefined symbol.. huh
if (relocation.symbol_index() == 0)
break;
auto res = lookup_symbol(symbol);
if (!res.has_value())
break;
auto* dynamic_object_of_symbol = res.value().dynamic_object;
FlatPtr symbol_value;
DynamicObject const* dynamic_object_of_symbol;
if (relocation.symbol_index() != 0) {
auto res = lookup_symbol(symbol);
if (!res.has_value())
break;
symbol_value = res.value().value;
dynamic_object_of_symbol = res.value().dynamic_object;
} else {
symbol_value = 0;
dynamic_object_of_symbol = &relocation.dynamic_object();
}
VERIFY(dynamic_object_of_symbol);
*patch_ptr = negative_offset_from_tls_block_end(res.value().value, dynamic_object_of_symbol->tls_offset().value());
size_t addend = relocation.addend_used() ? relocation.addend() : *patch_ptr;
*patch_ptr = negative_offset_from_tls_block_end(symbol_value + addend, dynamic_object_of_symbol->tls_offset().value());
break;
}
#ifndef __LP64__