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DynamicLoader: Annotate all loaded library ranges as immutable

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To further protect all virtual memory regions of the loaded libraries,
don't allow to mutate these regions both in changing their annotations
nor the protection bits.
This commit is contained in:
Liav A 2022-12-15 21:09:20 +02:00 • committed by Andrew Kaster
parent 8585b2dc23
commit d97aa9cf8c
1 changed files with 13 additions and 5 deletions
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18
Userland/Libraries/LibELF/DynamicLinker.cpp
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@ -394,17 +394,25 @@ static Result<void, DlErrorMessage> link_main_library(DeprecatedString const& pa
VERIFY(!result.is_error());
auto& object = result.value();
if (loader.filepath().ends_with("/libc.so"sv)) {
initialize_libc(*object);
}
if (loader.filepath().ends_with("/libsystem.so"sv)) {
VERIFY(!loader.text_segments().is_empty());
for (auto const& segment : loader.text_segments()) {
if (syscall(SC_annotate_mapping, segment.address().get(), static_cast<int>(VirtualMemoryRangeFlags::SyscallCode))) {
auto flags = static_cast<int>(VirtualMemoryRangeFlags::SyscallCode) | static_cast<int>(VirtualMemoryRangeFlags::Immutable);
if (syscall(SC_annotate_mapping, segment.address().get(), flags)) {
VERIFY_NOT_REACHED();
}
}
} else {
for (auto const& segment : loader.text_segments()) {
auto flags = static_cast<int>(VirtualMemoryRangeFlags::Immutable);
if (syscall(SC_annotate_mapping, segment.address().get(), flags)) {
VERIFY_NOT_REACHED();
}
}
}
if (loader.filepath().ends_with("/libc.so"sv)) {
initialize_libc(*object);
}
}