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svc: Use proper random entropy generation algorithm

This commit is contained in:
Zach Hilman 2018-11-13 12:25:43 -05:00
parent 65bd03d74c
commit ab552e4a25
6 changed files with 33 additions and 8 deletions

View file

@ -17,6 +17,7 @@
#include "core/hle/kernel/thread.h"
#include "core/hle/kernel/vm_manager.h"
#include "core/memory.h"
#include "core/settings.h"
namespace Kernel {
@ -35,6 +36,11 @@ SharedPtr<Process> Process::Create(KernelCore& kernel, std::string&& name) {
process->process_id = kernel.CreateNewProcessID();
process->svc_access_mask.set();
std::mt19937 rng(Settings::values.rng_seed.value_or(0));
std::uniform_int_distribution<u64> distribution;
std::generate(process->random_entropy.begin(), process->random_entropy.end(),
[&] { return distribution(rng); });
kernel.AppendNewProcess(process);
return process;
}

View file

@ -8,6 +8,7 @@
#include <bitset>
#include <cstddef>
#include <memory>
#include <random>
#include <string>
#include <vector>
#include <boost/container/static_vector.hpp>
@ -119,6 +120,8 @@ struct CodeSet final {
class Process final : public Object {
public:
static constexpr std::size_t RANDOM_ENTROPY_SIZE = 4;
static SharedPtr<Process> Create(KernelCore& kernel, std::string&& name);
std::string GetTypeName() const override {
@ -212,6 +215,11 @@ public:
total_process_running_time_ticks += ticks;
}
/// Gets 8 bytes of random data for svcGetInfo RandomEntropy
u64 GetRandomEntropy(std::size_t index) const {
return random_entropy.at(index);
}
/**
* Loads process-specifics configuration info with metadata provided
* by an executable.
@ -321,6 +329,9 @@ private:
/// Per-process handle table for storing created object handles in.
HandleTable handle_table;
/// Random values for svcGetInfo RandomEntropy
std::array<u64, RANDOM_ENTROPY_SIZE> random_entropy;
std::string name;
};

View file

@ -559,7 +559,16 @@ static ResultCode GetInfo(u64* result, u64 info_id, u64 handle, u64 info_sub_id)
*result = 0;
break;
case GetInfoType::RandomEntropy:
*result = Settings::values.rng_seed.value_or(0);
if (handle != 0) {
return ERR_INVALID_HANDLE;
}
if (info_sub_id >= Process::RANDOM_ENTROPY_SIZE) {
return ERR_INVALID_COMBINATION_KERNEL;
}
*result = current_process->GetRandomEntropy(info_sub_id);
return RESULT_SUCCESS;
break;
case GetInfoType::ASLRRegionBaseAddr:
*result = vm_manager.GetASLRRegionBaseAddress();

View file

@ -115,7 +115,7 @@ struct Values {
// System
bool use_docked_mode;
bool enable_nfc;
std::optional<u64> rng_seed;
std::optional<u32> rng_seed;
s32 current_user;
s32 language_index;

View file

@ -140,7 +140,7 @@ ConfigureSystem::ConfigureSystem(QWidget* parent)
connect(ui->rng_seed_checkbox, &QCheckBox::stateChanged, this, [this](bool checked) {
ui->rng_seed_edit->setEnabled(checked);
if (!checked)
ui->rng_seed_edit->setText(QStringLiteral("0000000000000000"));
ui->rng_seed_edit->setText(QStringLiteral("00000000"));
});
scene = new QGraphicsScene;
@ -165,9 +165,8 @@ void ConfigureSystem::setConfiguration() {
ui->rng_seed_checkbox->setChecked(Settings::values.rng_seed.has_value());
ui->rng_seed_edit->setEnabled(Settings::values.rng_seed.has_value());
const auto rng_seed = QString("%1")
.arg(Settings::values.rng_seed.value_or(0), 16, 16, QLatin1Char{'0'})
.toUpper();
const auto rng_seed =
QString("%1").arg(Settings::values.rng_seed.value_or(0), 8, 16, QLatin1Char{'0'}).toUpper();
ui->rng_seed_edit->setText(rng_seed);
}

View file

@ -269,10 +269,10 @@
</font>
</property>
<property name="inputMask">
<string>HHHHHHHHHHHHHHHH</string>
<string>HHHHHHHH</string>
</property>
<property name="maxLength">
<number>16</number>
<number>8</number>
</property>
</widget>
</item>