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loader: provide default arguments (zero byte) to NSOs 

Certain newer unity games (Terraria, Pokemon Mystery Dungeon) require
that the argument region be populated. Failure to do so results in
an integer underflow in argument count, and eventually an unmapped
read at 0x800000000. Providing this default fixes this.

Note that the behavior of official software is as yet unverified,
arguments-wise.
This commit is contained in:
Michael Scire 2020-01-22 20:14:06 -08:00
parent d8e0d839bd
commit 5a7eecc3ad
2 changed files with 10 additions and 3 deletions
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11
src/core/loader/nso.cpp
View File

@ -97,7 +97,8 @@ std::optional<VAddr> AppLoader_NSO::LoadModule(Kernel::Process& process,
if (nso_header.IsSegmentCompressed(i)) {
data = DecompressSegment(data, nso_header.segments[i]);
}
program_image.resize(nso_header.segments[i].location + data.size());
program_image.resize(nso_header.segments[i].location +
PageAlignSize(static_cast<u32>(data.size())));
std::memcpy(program_image.data() + nso_header.segments[i].location, data.data(),
data.size());
codeset.segments[i].addr = nso_header.segments[i].location;
@ -105,8 +106,12 @@ std::optional<VAddr> AppLoader_NSO::LoadModule(Kernel::Process& process,
codeset.segments[i].size = PageAlignSize(static_cast<u32>(data.size()));
}
if (should_pass_arguments && !Settings::values.program_args.empty()) {
const auto arg_data = Settings::values.program_args;
if (should_pass_arguments) {
std::vector<u8> arg_data{Settings::values.program_args.begin(),
Settings::values.program_args.end()};
if (arg_data.empty()) {
arg_data.resize(NSO_ARGUMENT_DEFAULT_SIZE);
}
codeset.DataSegment().size += NSO_ARGUMENT_DATA_ALLOCATION_SIZE;
NSOArgumentHeader args_header{
NSO_ARGUMENT_DATA_ALLOCATION_SIZE, static_cast<u32_le>(arg_data.size()), {}};

2
src/core/loader/nso.h
View File

@ -56,6 +56,8 @@ static_assert(sizeof(NSOHeader) == 0x100, "NSOHeader has incorrect size.");
static_assert(std::is_trivially_copyable_v<NSOHeader>, "NSOHeader must be trivially copyable.");
constexpr u64 NSO_ARGUMENT_DATA_ALLOCATION_SIZE = 0x9000;
// NOTE: Official software default argument state is unverified.
constexpr u64 NSO_ARGUMENT_DEFAULT_SIZE = 1;
struct NSOArgumentHeader {
u32_le allocated_size;