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Fix .hook section being allocated without any hooked symbols

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Due to the trampoline and save/load context functions, `GetHookSectionSize` returned a non-zero size for when there were no hooked symbols supplied to it. This is problematic as it isn't required and hooking is currently not stable so it can lead to crashes or freezes in certain titles.
This commit is contained in:
PixelyIon 2023-01-10 22:49:19 +05:30 committed by Mark Collins
parent 3fa314f6cb
commit f882b613bc
2 changed files with 49 additions and 27 deletions
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73
app/src/main/cpp/skyline/loader/loader.cpp
View File

@ -34,39 +34,58 @@ namespace skyline::loader {
std::vector<nce::NCE::HookedSymbolEntry> executableSymbols;
size_t hookSize{};
if (dynamicallyLinked) {
for (auto &symbol : dynsym) {
if (symbol.st_name == 0 || symbol.st_value == 0)
continue;
if constexpr (!hle::HookedSymbols.empty()) {
for (auto &symbol : dynsym) {
if (symbol.st_name == 0 || symbol.st_value == 0)
continue;
if (ELF64_ST_TYPE(symbol.st_info) != STT_FUNC || ELF64_ST_BIND(symbol.st_info) != STB_GLOBAL || symbol.st_shndx == SHN_UNDEF)
continue;
if (ELF64_ST_TYPE(symbol.st_info) != STT_FUNC || ELF64_ST_BIND(symbol.st_info) != STB_GLOBAL || symbol.st_shndx == SHN_UNDEF)
continue;
std::string_view symbolName{dynstr.data() + symbol.st_name};
std::string_view symbolName{dynstr.data() + symbol.st_name};
auto item{std::find_if(hle::HookedSymbols.begin(), hle::HookedSymbols.end(), [&symbolName](const auto &item) {
return item.name == symbolName;
})};
if (item != hle::HookedSymbols.end()) {
executableSymbols.emplace_back(std::string{symbolName}, item->hook, &symbol.st_value);
continue;
auto item{std::find_if(hle::HookedSymbols.begin(), hle::HookedSymbols.end(), [&symbolName](const auto &item) {
return item.name == symbolName;
})};
if (item != hle::HookedSymbols.end()) {
executableSymbols.emplace_back(std::string{symbolName}, item->hook, &symbol.st_value);
continue;
}
#ifdef PRINT_HOOK_ALL
if (symbolName == "memcpy" || symbolName == "memcmp" || symbolName == "memset" || symbolName == "strcmp" || symbolName == "strlen")
// If symbol is from libc (such as memcpy, strcmp, strlen, etc), we don't need to hook it
continue;
executableSymbols.emplace_back(std::string{symbolName}, hle::EntryExitHook{
.entry = [](const DeviceState &, const hle::HookedSymbol &symbol) {
Logger::Error("Entering \"{}\" ({})", symbol.prettyName, symbol.name);
},
.exit = [](const DeviceState &, const hle::HookedSymbol &symbol) {
Logger::Error("Exiting \"{}\"", symbol.prettyName);
},
}, &symbol.st_value);
#endif
}
#ifdef PRINT_HOOK_ALL
if (symbolName == "memcpy" || symbolName == "memcmp" || symbolName == "memset" || symbolName == "strcmp" || symbolName == "strlen")
// If symbol is from libc (such as memcpy, strcmp, strlen, etc), we don't need to hook it
continue;
executableSymbols.emplace_back(std::string{symbolName}, hle::EntryExitHook{
.entry = [](const DeviceState &, const hle::HookedSymbol &symbol) {
Logger::Error("Entering \"{}\" ({})", symbol.prettyName, symbol.name);
},
.exit = [](const DeviceState &, const hle::HookedSymbol &symbol) {
Logger::Error("Exiting \"{}\"", symbol.prettyName);
},
}, &symbol.st_value);
#endif
}
#ifdef PRINT_HOOK_ALL
for (auto &symbol : dynsym) {
if (symbolName == "memcpy" || symbolName == "memcmp" || symbolName == "memset" || symbolName == "strcmp" || symbolName == "strlen")
// If symbol is from libc (such as memcpy, strcmp, strlen, etc), we don't need to hook it
continue;
executableSymbols.emplace_back(std::string{symbolName}, hle::EntryExitHook{
.entry = [](const DeviceState &, const hle::HookedSymbol &symbol) {
Logger::Error("Entering \"{}\" ({})", symbol.prettyName, symbol.name);
},
.exit = [](const DeviceState &, const hle::HookedSymbol &symbol) {
Logger::Error("Exiting \"{}\"", symbol.prettyName);
},
}, &symbol.st_value);
}
#endif
hookSize = util::AlignUp(state.nce->GetHookSectionSize(executableSymbols), PAGE_SIZE);
}

3
app/src/main/cpp/skyline/nce.cpp
View File

@ -515,6 +515,9 @@ namespace skyline::nce {
}
size_t NCE::GetHookSectionSize(span<HookedSymbolEntry> entries) {
if (entries.empty())
return 0;
size_t size{guest::SaveCtxSize + guest::LoadCtxSize + TrampolineSize};
for (const auto &entry : entries) {
constexpr size_t EmitTrampolineSize{10};