mirror of
https://github.com/boykopovar/AnyPS5.git
synced 2026-10-23 09:03:22 -05:00
Dean Galvin
5a8165282f
Driver::Submit checks the title's submission packet, which the title passes on its own thread stack. Host thread stacks are neither registry mappings nor write-watched, so no page-state cache covers them and on Linux every check scans /proc/self/maps line by line: about 1.5 ms per submission on the render thread of PPSA21564 (66% of that thread's samples in perf at the title). A range between the calling thread's current frame and its stack's top holds the frames of every caller, so it is mapped readable and writable for as long as the call lasts; verify() now accepts it without a query. A thread on another stack (a fiber's, a signal stack) has its frame outside the thread's bounds and still gets the page query, as does any range that runs past the stack's top or starts below the frame. GetCurrentThreadStackLimits needs _WIN32_WINNT 0x0602 on MinGW, as libkernel already sets; GuestMemory.cpp is compiled by several targets, so the definition is a property of the source file.
74 lines
3.5 KiB
C++
74 lines
3.5 KiB
C++
#include "BdaTests.hpp"
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#include "prx/libSceAgcDriver/Execution/include/GuestMemory.hpp"
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#include <cstddef>
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#include <cstdint>
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#include <exception>
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#include <stdexcept>
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#include <string>
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#if defined(__linux__)
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#include <pthread.h>
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#include <sys/mman.h>
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#include <unistd.h>
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#endif
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namespace {
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using AgcDriver::Graphics::Require;
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namespace GuestMemory = AgcDriver::GuestMemory;
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void checkLiveStack(std::uintptr_t stackBottom, std::uintptr_t stackTop, std::uintptr_t guardEnd) {
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alignas(16) volatile std::uint64_t packet[2] = {1, 2};
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const auto* address = const_cast<const std::uint64_t*>(packet);
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Require(GuestMemory::Accessible(address, sizeof(packet)) && GuestMemory::Accessible(address, sizeof(packet), true), "a live stack frame is not accessible");
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GuestMemory::CheckRange(address, sizeof(packet), alignof(std::uint64_t), true);
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if (stackTop == 0) return;
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Require(GuestMemory::Accessible(reinterpret_cast<const void*>(stackTop - 16), 16, true), "the top of the live stack is not accessible");
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Require(!GuestMemory::Accessible(reinterpret_cast<const void*>(stackTop - 16), 32), "a range past the stack's top counts as accessible");
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Require(!GuestMemory::Accessible(reinterpret_cast<const void*>(stackTop), guardEnd - stackTop), "the page above the stack counts as accessible");
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Require(!GuestMemory::Accessible(reinterpret_cast<const void*>(stackBottom), 16), "an inaccessible page of the stack below the live frames counts as accessible");
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bool rejected = false;
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try {
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GuestMemory::CheckRange(reinterpret_cast<const void*>(stackTop - 8), 16, 8);
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} catch (const std::runtime_error&) {
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rejected = true;
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}
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Require(rejected, "CheckRange accepted a range past the stack's top");
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}
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}
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void RunLiveStackAccessTests() {
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checkLiveStack(0, 0, 0);
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#if defined(__linux__)
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const auto page = static_cast<std::size_t>(sysconf(_SC_PAGESIZE));
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const std::size_t stackBytes = 256 * 1024;
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auto* block = static_cast<std::byte*>(mmap(nullptr, stackBytes + page, PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_ANONYMOUS, -1, 0));
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Require(block != MAP_FAILED, "cannot map a test stack");
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Require(mprotect(block + stackBytes, page, PROT_NONE) == 0 && mprotect(block, page, PROT_NONE) == 0, "cannot protect the test stack's guard pages");
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const auto top = reinterpret_cast<std::uintptr_t>(block) + stackBytes;
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struct Arguments {
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std::uintptr_t bottom;
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std::uintptr_t top;
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std::uintptr_t guardEnd;
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std::string failure;
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} arguments{reinterpret_cast<std::uintptr_t>(block), top, top + page, {}};
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pthread_attr_t attributes;
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Require(pthread_attr_init(&attributes) == 0 && pthread_attr_setstack(&attributes, block, stackBytes) == 0, "cannot set the test stack");
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pthread_t thread;
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Require(pthread_create(&thread, &attributes, [](void* raw) -> void* {
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auto& arguments = *static_cast<Arguments*>(raw);
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try {
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checkLiveStack(arguments.bottom, arguments.top, arguments.guardEnd);
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} catch (const std::exception& error) {
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arguments.failure = error.what();
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}
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return nullptr;
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}, &arguments) == 0, "cannot start the stack test thread");
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pthread_join(thread, nullptr);
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pthread_attr_destroy(&attributes);
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Require(GuestMemory::Accessible(block + page, 64, true) && !GuestMemory::Accessible(block, 16) && !GuestMemory::Accessible(block + stackBytes, 16), "the released test stack is misreported");
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munmap(block, stackBytes + page);
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Require(arguments.failure.empty(), arguments.failure.c_str());
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#endif
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}
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