mirror of
https://github.com/boykopovar/AnyPS5.git
synced 2026-10-22 08:33:12 -05:00
Yunus Shaikh
fa9ac37ce7
GuestWriteWatchCovers says whether a range is watched in full. The Linux and macOS watches unregister page ranges, so a range can hold watched pages between unwatched ones, and code that must act on every watched byte of a store has had no way to find them short of asking page by page. GuestWriteWatchOverlaps answers with one lookup in the registered ranges, like Covers. The macOS write-watch test and agc_write_tracking on Linux check it around watched pages between unwatched ones, at both edges and for an empty range.
1013 lines
58 KiB
C++
1013 lines
58 KiB
C++
#include "prx/libSceAgcDriver/Execution/include/GuestMemory.hpp"
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#include "prx/libc/include/GuestAllocations.hpp"
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#include "prx/libc/include/GuestArena.hpp"
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#include "prx/libc/include/GuestWriteWatch.hpp"
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#ifdef _WIN32
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#ifndef NOMINMAX
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#define NOMINMAX
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#endif
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#include <windows.h>
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#else
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#include <sys/mman.h>
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#include <unistd.h>
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#endif
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#include <array>
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#include <cstdint>
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#include <cstring>
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#include <iostream>
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#include <limits>
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#include <stdexcept>
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#include <string>
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#include <string_view>
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#include <thread>
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#include <vector>
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namespace {
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using namespace AgcDriver::GuestMemory;
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constexpr std::size_t Block = 65536;
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#ifdef _WIN32
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constexpr wchar_t HostHoleMode[] = L"--host-hole";
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#endif
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void Require(bool condition, const std::string& message) {
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if (!condition) throw std::runtime_error(message);
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}
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void* AllocateWatched(std::size_t bytes, bool crossLeaf = false) {
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#ifdef _WIN32
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static_cast<void>(crossLeaf);
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void* block = GuestArena::GuestArenaAllocate_nid_postfix(bytes, Block);
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GuestArena::GuestArenaCommit_nid_postfix(block, bytes, PAGE_READWRITE, bytes);
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#else
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const std::size_t alignment = crossLeaf ? std::size_t{1} << 32 : Block;
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const auto prefix = crossLeaf ? Block : 0;
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void* raw = mmap(nullptr, bytes + alignment, PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
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if (raw == MAP_FAILED) throw std::runtime_error("cannot map the watched block");
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const auto begin = reinterpret_cast<std::uintptr_t>(raw);
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const auto aligned = ((begin + prefix + alignment - 1) & ~static_cast<std::uintptr_t>(alignment - 1)) - prefix;
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if (aligned != begin) munmap(raw, aligned - begin);
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if (aligned + bytes != begin + bytes + alignment) munmap(reinterpret_cast<void*>(aligned + bytes), begin + alignment - aligned);
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void* block = reinterpret_cast<void*>(aligned);
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GuestWriteWatch::GuestWriteWatchRegister_nid_postfix(block, bytes);
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#endif
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Require(Watched(reinterpret_cast<std::uint64_t>(block), bytes), "the test block is not watched");
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return block;
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}
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void CheckSharedBlock() {
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void* memory = AllocateWatched(3 * Block);
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const auto base = reinterpret_cast<std::uint64_t>(memory);
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const auto boundary = base + 2 * Block - 0xb800;
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const auto firstBegin = base;
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const auto secondEnd = base + 3 * Block;
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const auto sharedFirst = boundary - (base + Block);
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const auto sharedSecond = base + 2 * Block - boundary;
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std::memset(memory, 0x11, 3 * Block);
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const auto synced = CollectWrites(base, 3 * Block);
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Require(synced != 0, "the test block is not collected");
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Require(MarkWritten(firstBegin, static_cast<std::size_t>(boundary - firstBegin)) != 0, "a driver store into watched memory is not stamped");
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std::array<std::uint64_t, 2> generations{synced, synced};
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std::array<std::uint8_t, 2> changed{};
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Require(ChangedBlocks(base + Block, 2 * Block, generations, changed) && changed[0] == BlockWritten && changed[1] == BlockUnchanged, "the shared block does not read as written");
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Require(!StoredOver(boundary, static_cast<std::size_t>(sharedSecond), synced), "a store of the neighbour's bytes counts for the second surface's part of the shared block");
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Require(StoredOver(base + Block, static_cast<std::size_t>(sharedFirst), synced), "the first surface's own store is not seen over its part of the shared block");
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Require(!StoredOver(boundary, static_cast<std::size_t>(secondEnd - boundary), synced), "the second surface reads as stored over");
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const auto touched = MarkWritten(boundary + 0x100, 4);
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Require(StoredOver(boundary, static_cast<std::size_t>(sharedSecond), synced), "a store over the second surface's bytes is not seen");
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Require(!StoredOver(boundary, static_cast<std::size_t>(sharedSecond), touched), "a store older than the generation is seen");
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const auto whole = TrackerGeneration();
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MarkWritten(base + Block, Block);
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Require(StoredOver(boundary, static_cast<std::size_t>(sharedSecond), whole), "a store over the whole block is not seen");
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const auto afterWhole = TrackerGeneration();
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MarkWritten(base + Block, static_cast<std::size_t>(sharedFirst));
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Require(!StoredOver(boundary, static_cast<std::size_t>(sharedSecond), afterWhole), "a partial store after a whole-block store is taken for the whole block");
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const auto many = TrackerGeneration();
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for (int store = 0; store < 6; ++store) MarkWritten(base + Block + static_cast<std::uint64_t>(store) * 64, 4);
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Require(StoredOver(boundary, static_cast<std::size_t>(sharedSecond), many), "forgotten driver stores are taken as missing the range");
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const auto beforeCpu = CollectWrites(base, 3 * Block);
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static_cast<volatile std::uint8_t*>(memory)[Block + 8] = 0x22;
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CollectWritesUncached(base, 3 * Block);
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Require(!StoredOver(boundary, static_cast<std::size_t>(sharedSecond), beforeCpu), "a CPU store outside the shared range counts for it");
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std::array<std::uint8_t, 64> unwatched{};
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const auto outside = reinterpret_cast<std::uint64_t>(unwatched.data());
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if (!Watched(outside, unwatched.size())) Require(StoredOver(outside, unwatched.size(), TrackerGeneration()), "an unwatched range reads as not stored over");
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}
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void CheckStoredAllSince() {
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constexpr std::size_t bytes = 4 * Block;
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auto* memory = static_cast<std::uint8_t*>(AllocateWatched(bytes));
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struct Cleanup {
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void* memory;
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~Cleanup() {
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#ifdef _WIN32
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GuestArena::GuestArenaReset_nid_postfix(memory, bytes);
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GuestArena::GuestArenaRelease_nid_postfix(memory, bytes);
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#else
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GuestWriteWatch::GuestWriteWatchUnregister_nid_postfix(memory, bytes);
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munmap(memory, bytes);
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#endif
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}
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} cleanup{memory};
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const auto base = reinterpret_cast<std::uint64_t>(memory);
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std::memset(memory, 0x11, bytes);
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auto before = CollectWritesUncached(base, bytes);
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Require(before != 0, "the complete-store block is not collected");
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Require(!StoredAllSince_nid_no_patch(base, 64, before), "a range with no driver store has complete coverage");
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MarkWritten(base + Block, Block);
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Require(StoredAllSince_nid_no_patch(base + Block, Block, before), "the first whole-block driver store has no complete coverage");
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Require(StoredAllSince_nid_no_patch(base + Block + 1, Block - 2, before), "a whole-block store lost its interior coverage");
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const auto whole = TrackerGeneration();
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Require(!StoredAllSince_nid_no_patch(base + Block, Block, whole), "a whole-block store at the baseline is taken as newer");
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before = TrackerGeneration();
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static_cast<volatile std::uint8_t*>(memory)[2 * Block + 7] = 0x22;
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CollectWritesUncached(base + 2 * Block, Block);
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Require(!StoredAllSince_nid_no_patch(base + 2 * Block, Block, before), "CPU-only stores prove complete driver coverage");
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before = TrackerGeneration();
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const std::array<std::byte, 4> dword{};
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Write(base + 16, dword);
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Require(StoredAllSince_nid_no_patch(base + 16, dword.size(), before), "a tracked dword store is absent from its exact range");
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Require(!StoredAllSince_nid_no_patch(base, 64, before), "one dword store proves complete surface coverage");
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Require(!StoredAllSince_nid_no_patch(base + 15, 5, before) && !StoredAllSince_nid_no_patch(base + 16, 5, before), "a dword store covers an unstored boundary byte");
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const auto dwordStored = TrackerGeneration();
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Require(!StoredAllSince_nid_no_patch(base + 16, dword.size(), dwordStored), "a dword store at the baseline is taken as newer");
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MarkWritten(base, 64);
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Require(StoredAllSince_nid_no_patch(base, 64, before), "a complete non-block-aligned range store is absent");
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before = TrackerGeneration();
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MarkWritten(base + 512, 16);
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MarkWritten(base + 544, 16);
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Require(!StoredAllSince_nid_no_patch(base + 512, 48, before), "split driver stores prove coverage across a hole");
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MarkWritten(base + 528, 16);
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Require(StoredAllSince_nid_no_patch(base + 512, 48, before), "out-of-order split driver stores did not form complete coverage");
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Require(!StoredAllSince_nid_no_patch(base + 512, 49, before), "split coverage includes an unstored final byte");
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before = TrackerGeneration();
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MarkWritten(base + 1024 + 8, 24);
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MarkWritten(base + 1024, 16);
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Require(StoredAllSince_nid_no_patch(base + 1024, 32, before), "overlapping driver intervals did not form complete coverage");
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before = TrackerGeneration();
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MarkWritten(base + Block - 4, 8);
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Require(StoredAllSince_nid_no_patch(base + Block - 4, 8, before), "a tracked store across a block boundary lost coverage");
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Require(!StoredAllSince_nid_no_patch(base + Block - 5, 9, before) && !StoredAllSince_nid_no_patch(base + Block - 4, 9, before), "a boundary store covers an unstored adjacent byte");
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before = TrackerGeneration();
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for (unsigned piece = 0; piece < 6; ++piece) MarkWritten(base + static_cast<std::uint64_t>(piece) * 64, 4);
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Require(!StoredAllSince_nid_no_patch(base, 4, before), "dropped driver evidence proves complete coverage");
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MarkWritten(base, Block);
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Require(StoredAllSince_nid_no_patch(base, Block, before), "a new whole-block store did not replace dropped evidence");
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before = TrackerGeneration();
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MarkWritten(base, 3 * Block);
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Require(StoredAllSince_nid_no_patch(base, 3 * Block, before), "complete multi-block stores lost coverage");
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Require(StoredAllSince_nid_no_patch(base + 1, 3 * Block - 2, before) && StoredAllSince_nid_no_patch(base + 3 * Block - 1, 1, before), "complete multi-block stores lost edge bytes");
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const auto complete = TrackerGeneration();
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Require(!StoredAllSince_nid_no_patch(base, 3 * Block, complete), "stores older than the baseline prove complete coverage");
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before = TrackerGeneration();
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MarkWritten(base + 2 * Block, Block);
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const auto driverStored = TrackerGeneration();
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static_cast<volatile std::uint8_t*>(memory)[2 * Block + 7] = 0x33;
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CollectWritesUncached(base + 2 * Block, Block);
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Require(StoredAllSince_nid_no_patch(base + 2 * Block, Block, before), "a later CPU store erased the proof that the driver stored every byte");
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Require(!UnchangedSinceCollected(base + 2 * Block, Block, driverStored), "the separate CPU-write check missed a store after complete driver coverage");
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Require(!StoredAllSince_nid_no_patch(base, 0, before) && !StoredAllSince_nid_no_patch(base, 1, 0), "empty or unknown-baseline complete coverage is accepted");
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Require(!StoredAllSince_nid_no_patch(std::numeric_limits<std::uint64_t>::max(), 2, before), "overflowing complete coverage is accepted");
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Unwatch(base + 3 * Block, Block);
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Require(MarkWritten(base + 3 * Block, Block) == 0, "an unwatched whole store acquired trusted driver coverage");
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Require(!StoredAllSince_nid_no_patch(base + 3 * Block, Block, before), "unwatched stores prove complete coverage");
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Require(!StoredAllSince_nid_no_patch(base + 3 * Block - 1, 2, before), "a range entering unwatched memory has complete coverage");
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std::array<std::uint8_t, 16> outside{};
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const auto outsideAddress = reinterpret_cast<std::uint64_t>(outside.data());
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if (!Watched(outsideAddress, outside.size())) {
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MarkWritten(outsideAddress, outside.size());
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Require(!StoredAllSince_nid_no_patch(outsideAddress, outside.size(), before), "an outside untracked range has complete coverage");
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}
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}
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void CheckOwnStore() {
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void* memory = AllocateWatched(2 * Block);
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const auto base = reinterpret_cast<std::uint64_t>(memory);
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const auto second = base + Block;
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std::memset(memory, 0x11, 2 * Block);
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const auto synced = CollectWrites(base, 2 * Block);
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Require(synced != 0, "the own-store block is not collected");
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std::array<std::byte, 8192> bytes{};
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bytes.fill(std::byte{0x44});
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Write(second, bytes);
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const auto stored = TrackerGeneration();
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Require(!UnchangedSince(second, bytes.size(), synced), "the driver store is not stamped");
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CollectWritesUncached(base, 2 * Block);
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Require(UnchangedSince(second, Block, stored), "a walk after a driver store reports the store again as a newer write");
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Require(UnchangedSinceCollected(second, bytes.size(), synced), "the driver store's own page faults are stamped as a CPU write");
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static_cast<volatile std::uint8_t*>(memory)[Block + 3 * 4096 + 8] = 0x22;
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const std::array<std::byte, 64> label{};
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Write(second + 3 * 4096 + 64, label);
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Require(!UnchangedSinceCollected(second + 3 * 4096, 4096, stored), "a CPU write before a driver store in its page is not stamped as one");
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const auto beforeCpu = TrackerGeneration();
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static_cast<volatile std::uint8_t*>(memory)[16] = 0x33;
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CollectWritesUncached(base, 2 * Block);
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Require(!UnchangedSince(base, 64, beforeCpu), "a CPU write after the driver store is not seen");
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}
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void CheckUnwatch() {
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void* memory = AllocateWatched(3 * Block);
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const auto base = reinterpret_cast<std::uint64_t>(memory);
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const auto imported = base + Block;
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std::memset(memory, 0x11, 3 * Block);
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BumpCollectEpoch();
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const auto before = CollectWrites(base, 3 * Block);
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Require(before != 0 && UnchangedSince(imported, Block, before), "the import range was not initially watched");
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Unwatch(imported, Block);
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Require(!Watched(imported, Block) && !UnchangedSince(imported, Block, before), "unwatch kept trusting import stamps");
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Require(CollectWrites(base, 3 * Block) == 0 && CollectWritesUncached(imported, Block) == 0, "unwatch did not invalidate a cached collect");
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Require(Watched(base, Block) && Watched(base + 2 * Block, Block), "unwatch disabled unrelated memory");
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const auto beforeDriverWrite = TrackerGeneration();
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Require(MarkWritten(imported, Block) == 0, "an unwatched import still produces trusted stamps");
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Require(TrackerGeneration() > beforeDriverWrite, "an unwatched driver write did not invalidate byte comparisons");
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const auto beforeOwnWrite = TrackerGeneration();
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StoreOwnBytes(imported, 1, [&] { *reinterpret_cast<std::uint8_t*>(imported) = 0x42; });
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Require(TrackerGeneration() > beforeOwnWrite, "an unwatched CPU store did not invalidate byte comparisons");
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std::array<std::uint64_t, 1> generations{before};
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std::array<std::uint8_t, 1> changed{};
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Require(!ChangedBlocks(imported, Block, generations, changed), "an unwatched import still uses block stamps");
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Unwatch(imported, Block);
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const auto adjacent = CollectWrites(base, Block);
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Require(adjacent != 0, "unwatch broke the adjacent block's collect");
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static_cast<volatile std::uint8_t*>(memory)[0] = 0x33;
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CollectWritesUncached(base, Block);
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Require(!UnchangedSince(base, Block, adjacent), "unwatch hid a CPU edit in unrelated memory");
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}
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void CheckNewestStamp() {
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void* memory = AllocateWatched(4 * Block);
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const auto base = reinterpret_cast<std::uint64_t>(memory);
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const auto first = base + Block;
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const auto second = base + 2 * Block;
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std::memset(memory, 0x11, 4 * Block);
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BumpCollectEpoch();
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CollectWrites(base, 4 * Block);
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Unwatch(first, 2 * Block);
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const auto firstBefore = NewestStamp(first, Block);
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const auto secondBefore = NewestStamp(second, Block);
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MarkWritten(second + 16, 4);
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Require(NewestStamp(second, Block) > secondBefore, "a driver store into unwatched memory did not advance its stamp");
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Require(NewestStamp(first, Block) == firstBefore, "a driver store advanced the stamp of other unwatched memory");
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const auto generation = TrackerGeneration();
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static_cast<volatile std::uint8_t*>(memory)[0] = 0x22;
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CollectWritesUncached(base, Block);
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Require(TrackerGeneration() > generation && NewestStamp(first, Block) == firstBefore, "a CPU store into watched memory advanced the stamp of unwatched memory");
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StoreOwnBytes(first, 1, [&] { *reinterpret_cast<std::uint8_t*>(first) = 0x42; });
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Require(NewestStamp(first, Block) > firstBefore, "an own store into unwatched memory did not advance its stamp");
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const auto partial = NewestStamp(base + 3 * Block - 8, Block + 8);
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static_cast<volatile std::uint8_t*>(memory)[3 * Block] = 0x33;
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CollectWritesUncached(base + 3 * Block, Block);
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Require(NewestStamp(base + 3 * Block - 8, Block + 8) > partial, "a CPU store into the watched part of a partly watched range did not advance its stamp");
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}
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void CheckPartlyWatchedStore() {
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void* memory = AllocateWatched(3 * Block);
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const auto base = reinterpret_cast<std::uint64_t>(memory);
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const auto stored = base + Block;
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const auto unwatched = base + 2 * Block;
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std::memset(memory, 0x11, 3 * Block);
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BumpCollectEpoch();
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Unwatch(unwatched, Block);
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const auto before = CollectWrites(base, 2 * Block);
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Require(before != 0 && UnchangedSince(base, 2 * Block, before), "the watched blocks were not collected");
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Require(MarkWritten(unwatched - 64, 128) == 0, "a driver store into partly watched memory is trusted");
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Require(!UnchangedSince(stored, Block, before), "a driver store into partly watched memory left its watched block unchanged");
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Require(StoredOver(unwatched - 64, 64, before), "a driver store into partly watched memory is not seen over its watched bytes");
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Require(!StoredOver(stored, Block - 64, before), "a driver store into partly watched memory is seen over watched bytes it did not store");
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Require(UnchangedSince(base, Block, before), "a driver store into partly watched memory stamped a block it did not store into");
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const auto beforeOwn = TrackerGeneration();
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Require(StoreOwnBytes(unwatched - 64, 128, [&] { std::memset(reinterpret_cast<void*>(unwatched - 64), 0x22, 128); }) == 0, "an own store into partly watched memory is trusted");
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Require(!UnchangedSince(stored, Block, beforeOwn), "an own store into partly watched memory left its watched block unchanged");
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Require(UnchangedSince(base, Block, beforeOwn), "an own store into partly watched memory stamped a block it did not store into");
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#ifndef _WIN32
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void* split = AllocateWatched(Block);
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const auto splitBase = reinterpret_cast<std::uint64_t>(split);
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const auto watchedHalf = splitBase + Block / 2;
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std::memset(split, 0x11, Block);
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Unwatch(splitBase, Block / 2);
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const auto beforeSplit = CollectWrites(watchedHalf, Block / 2);
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Require(beforeSplit != 0 && UnchangedSince(watchedHalf, Block / 2, beforeSplit), "the watched half of a split block was not collected");
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Require(MarkWritten(splitBase + 64, 128) == 0 && UnchangedSince(watchedHalf, Block / 2, beforeSplit), "a driver store into the unwatched half of a split block stamped its watched half");
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Require(MarkWritten(watchedHalf - 64, 128) == 0, "a driver store across the halves of a split block is trusted");
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Require(!UnchangedSince(watchedHalf, Block / 2, beforeSplit), "a driver store across the halves of a split block left its watched half unchanged");
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#endif
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}
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#ifndef _WIN32
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void CheckWatchOverlaps() {
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const auto page = static_cast<std::size_t>(sysconf(_SC_PAGESIZE));
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void* memory = AllocateWatched(Block);
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const auto base = reinterpret_cast<std::uintptr_t>(memory);
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Require(GuestWriteWatch::GuestWriteWatchUnregister_nid_postfix(memory, page), "cannot unwatch the block's first page");
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Require(GuestWriteWatch::GuestWriteWatchUnregister_nid_postfix(reinterpret_cast<void*>(base + 3 * page), Block - 3 * page), "cannot unwatch the block's last pages");
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Require(!GuestWriteWatch::GuestWriteWatchCovers_nid_postfix(base, Block), "a block with unwatched pages is covered");
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Require(GuestWriteWatch::GuestWriteWatchOverlaps_nid_postfix(base, Block), "a block with watched pages inside does not overlap the watch");
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Require(GuestWriteWatch::GuestWriteWatchOverlaps_nid_postfix(base + page - 1, 2), "a range ending in a watched page does not overlap the watch");
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Require(GuestWriteWatch::GuestWriteWatchOverlaps_nid_postfix(base + 3 * page - 1, 2), "a range starting in a watched page does not overlap the watch");
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Require(!GuestWriteWatch::GuestWriteWatchOverlaps_nid_postfix(base, page), "an unwatched page before the watched ones overlaps the watch");
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Require(!GuestWriteWatch::GuestWriteWatchOverlaps_nid_postfix(base + 3 * page, Block - 3 * page), "unwatched pages after the watched ones overlap the watch");
|
|
Require(!GuestWriteWatch::GuestWriteWatchOverlaps_nid_postfix(base + page, 0), "an empty range overlaps the watch");
|
|
}
|
|
#endif
|
|
|
|
#ifdef _WIN32
|
|
void CheckDeferredSharedImports() {
|
|
constexpr std::size_t bytes = 4 * Block;
|
|
HANDLE section = CreateFileMappingW(INVALID_HANDLE_VALUE, nullptr, PAGE_EXECUTE_READWRITE | SEC_RESERVE, 0, bytes, nullptr);
|
|
Require(section != nullptr, "cannot create shared import backing");
|
|
auto* memory = static_cast<std::uint8_t*>(GuestArena::GuestArenaAllocate_nid_postfix(bytes, Block));
|
|
Require(memory != nullptr, "cannot allocate shared import address");
|
|
GuestArena::GuestArenaMap_nid_postfix(memory, bytes, section, 0, PAGE_READWRITE);
|
|
const auto base = reinterpret_cast<std::uintptr_t>(memory);
|
|
const auto protection = [&](std::size_t offset) {
|
|
MEMORY_BASIC_INFORMATION info{};
|
|
Require(VirtualQuery(memory + offset, &info, sizeof(info)) == sizeof(info), "cannot query shared import protection");
|
|
return info.Protect;
|
|
};
|
|
Require(ImportWatched(base, bytes, [] { return true; }), "fresh shared import failed");
|
|
Require(protection(0) == PAGE_READWRITE && protection(bytes - 1) == PAGE_READWRITE, "fresh import armed shared pages");
|
|
const auto gpu = MarkWritten(base + 4096, 4);
|
|
Require(gpu != 0 && protection(0) == PAGE_READONLY && protection(Block) == PAGE_READWRITE, "GPU write did not activate only its block");
|
|
CollectWritesUncached(base, Block);
|
|
Require(!WrittenSince(base + 4096, 4, gpu) && !StoredOver(base + 4096, 4, gpu), "first collect overwrote a GPU generation");
|
|
static_cast<volatile std::uint8_t*>(memory)[4096] = 0x44;
|
|
CollectWritesUncached(base, Block);
|
|
Require(WrittenSince(base + 4096, 4, gpu) && StoredOver(base + 4096, 4, gpu), "CPU store after GPU write was missed");
|
|
|
|
const auto second = base + Block;
|
|
const auto before = CollectWritesUncached(second, 4096);
|
|
Require(MarkWritten(second, 4) != 0, "GPU write next to fresh pages failed");
|
|
Require(UnchangedSinceCollected(second, 4, before), "fresh neighbors were stamped as new CPU writes over a collected page");
|
|
Require(StoredOver(second + 8 * 4096, 4096, before), "fresh neighbor history was lost");
|
|
const std::array<std::uint64_t, 1> generations{before};
|
|
std::array<std::uint8_t, 1> changed{};
|
|
std::array<std::uint8_t, 1> cpu{};
|
|
Require(ChangedBlocks(second, Block, generations, changed, cpu) && changed[0] == BlockWritten && cpu[0] == 0, "fresh collection set the block's CPU stamp");
|
|
const auto generation = TrackerGeneration();
|
|
Require(MarkWritten(second, 4) == generation + 1, "an already collected GPU block advanced twice");
|
|
|
|
const auto third = base + 2 * Block;
|
|
const auto cached = CollectWritesUncached(third, Block);
|
|
Require(ImportWatched(third, Block, [&] {
|
|
static_cast<volatile std::uint8_t*>(memory)[2 * Block] = 0x55;
|
|
return true;
|
|
}), "tracked import window failed");
|
|
Require(!UnchangedSince(third, Block, cached) && WrittenSince(third, Block, cached), "a store of new bytes within a tracked import window was missed");
|
|
const auto afterImport = CollectWritesUncached(third, Block);
|
|
static_cast<volatile std::uint8_t*>(memory)[2 * Block] = 0x66;
|
|
Require(ImportWatched(third, Block, [] { return true; }) && WrittenSince(third, Block, afterImport), "pre-import CPU store was not collected");
|
|
|
|
GuestArena::GuestArenaReset_nid_postfix(memory + 3 * Block, 16384);
|
|
const auto edge = base + 3 * Block + 16384;
|
|
Require(ImportWatched(edge, Block - 16384, [] { return true; }), "unaligned shared import failed");
|
|
const auto edgeGpu = MarkWritten(edge, 4);
|
|
Require(edgeGpu != 0, "fresh collection rejected an unmapped block neighbor");
|
|
CollectWritesUncached(edge, Block - 16384);
|
|
Require(!WrittenSince(edge, 4, edgeGpu), "edge block collection overwrote GPU results");
|
|
GuestArena::GuestArenaReset_nid_postfix(memory, bytes);
|
|
GuestArena::GuestArenaRelease_nid_postfix(memory, bytes);
|
|
CloseHandle(section);
|
|
}
|
|
|
|
|
|
void CheckPrivateMappingReuse() {
|
|
void* memory = AllocateWatched(3 * Block);
|
|
const auto base = reinterpret_cast<std::uint64_t>(memory);
|
|
std::memset(memory, 0x11, 3 * Block);
|
|
BumpCollectEpoch();
|
|
const auto before = CollectWrites(base, 3 * Block);
|
|
Require(before != 0, "the original backing was not collected");
|
|
Unwatch(base + Block, Block);
|
|
Require(!Watched(base + Block, Block), "the imported block stayed watched");
|
|
GuestArena::GuestArenaCommit_nid_postfix(memory, 3 * Block, PAGE_READWRITE, 3 * Block);
|
|
Require(!Watched(base + Block, Block), "a protection-only commit restored an imported block");
|
|
const auto neighbour = CollectWrites(base, Block);
|
|
Require(neighbour != 0, "the neighbouring block was not collected before remapping");
|
|
GuestArena::GuestArenaReset_nid_postfix(memory, 3 * Block);
|
|
GuestArena::GuestArenaRelease_nid_postfix(memory, 3 * Block);
|
|
auto* replacement = GuestArena::GuestArenaAllocateAtOrAbove_nid_postfix(base, 3 * Block, Block);
|
|
Require(replacement == memory, "the released arena address was not reused");
|
|
GuestArena::GuestArenaCommit_nid_postfix(replacement, 3 * Block, PAGE_READWRITE, 3 * Block);
|
|
Require(Watched(base, 3 * Block), "fresh backing at an excluded address is not watched");
|
|
Require(!UnchangedSince(base + Block, Block, before), "fresh backing reused an old import generation");
|
|
Require(!UnchangedSince(base, Block, neighbour), "fresh backing reused an adjacent block's old generation");
|
|
const auto after = CollectWrites(base, 3 * Block);
|
|
Require(after > before && UnchangedSince(base, 3 * Block, after), "fresh backing was not collected");
|
|
static_cast<volatile std::uint8_t*>(replacement)[Block + 8] = 0x22;
|
|
CollectWritesUncached(base, 3 * Block);
|
|
Require(!UnchangedSince(base + Block, Block, after), "a CPU edit in fresh backing was missed");
|
|
Unwatch(base + Block, Block);
|
|
Require(!Watched(base + Block, Block) && CollectWrites(base + Block, Block) == 0, "a second import of fresh backing stayed watched");
|
|
GuestArena::GuestArenaReset_nid_postfix(replacement, 3 * Block);
|
|
GuestArena::GuestArenaRelease_nid_postfix(replacement, 3 * Block);
|
|
}
|
|
|
|
void CheckUntrackedHint() {
|
|
constexpr std::size_t bytes = 4 * Block;
|
|
auto* memory = static_cast<volatile std::uint8_t*>(GuestArena::GuestArenaAllocate_nid_postfix(bytes, Block));
|
|
GuestArena::GuestArenaCommit_nid_postfix(const_cast<std::uint8_t*>(memory), bytes, PAGE_READWRITE, 16384);
|
|
struct Cleanup {
|
|
void* memory;
|
|
~Cleanup() {
|
|
GuestArena::GuestArenaReset_nid_postfix(memory, bytes);
|
|
GuestArena::GuestArenaRelease_nid_postfix(memory, bytes);
|
|
}
|
|
} cleanup{const_cast<std::uint8_t*>(memory)};
|
|
const auto base = reinterpret_cast<std::uint64_t>(memory);
|
|
const auto hinted = base + Block;
|
|
constexpr std::size_t hintedBytes = 2 * Block;
|
|
for (std::size_t offset = 0; offset < bytes; offset += 4096) memory[offset] = 0x11;
|
|
BumpCollectEpoch();
|
|
Require(CollectWrites(base, bytes) != 0 && UntrackedHint(base, bytes) == 0, "watched memory has an untracked hint");
|
|
Unwatch(hinted, hintedBytes);
|
|
const auto stamp = NewestStamp(hinted, hintedBytes);
|
|
const auto first = UntrackedHint(hinted, hintedBytes);
|
|
Require(first != 0, "memory that left the watch has no untracked hint");
|
|
Require(UntrackedHint(base, bytes) == 0 && UntrackedHint(hinted - 4096, 8192) == 0, "a range with watched blocks has an untracked hint");
|
|
std::array<std::uint8_t, 64> host{};
|
|
Require(UntrackedHint(reinterpret_cast<std::uint64_t>(host.data()), host.size()) == 0, "memory outside the arena has an untracked hint");
|
|
Require(!Watched(hinted, hintedBytes) && CollectWrites(hinted, hintedBytes) == 0 && !UnchangedSince(hinted, hintedBytes, TrackerGeneration()), "a hinted range reads as tracked");
|
|
std::array<std::uint64_t, 2> generations{first, first};
|
|
std::array<std::uint8_t, 2> changed{};
|
|
Require(!ChangedBlocks(hinted, hintedBytes, generations, changed), "a hinted range uses block stamps");
|
|
for (unsigned epoch = 0; epoch < 8; ++epoch) {
|
|
BumpCollectEpoch();
|
|
Require(UntrackedHint(hinted, hintedBytes) == first, "an untracked hint moved without a store");
|
|
}
|
|
memory[Block + 3 * 16384 + 8] ^= 1;
|
|
Require(UntrackedHint(hinted, hintedBytes) == first, "an untracked hint was walked twice in one epoch");
|
|
BumpCollectEpoch();
|
|
const auto stored = UntrackedHint(hinted, hintedBytes);
|
|
Require(stored > first, "a CPU store into a hinted range did not move its hint");
|
|
Require(UntrackedHint(hinted + Block, Block) == first, "a CPU store moved the hint of another block");
|
|
BumpCollectEpoch();
|
|
Require(UntrackedHint(hinted, hintedBytes) == stored, "an untracked hint moved again without a store");
|
|
memory[Block + 8] = memory[Block + 8];
|
|
BumpCollectEpoch();
|
|
const auto rewritten = UntrackedHint(hinted, hintedBytes);
|
|
Require(rewritten > stored, "a store of the bytes already there did not move the hint");
|
|
std::thread([&] { memory[2 * Block + 5 * 4096] ^= 1; }).join();
|
|
BumpCollectEpoch();
|
|
const auto threaded = UntrackedHint(hinted, hintedBytes);
|
|
Require(threaded > rewritten, "a store from another thread did not move the hint");
|
|
Require(UntrackedHint(hinted + Block, Block) == threaded && UntrackedHint(hinted, Block) == rewritten, "a walk stamped a store into the wrong block");
|
|
Require(NewestStamp(hinted, hintedBytes) == stamp, "untracked hint walks advanced the block stamps");
|
|
Unwatch(hinted, hintedBytes);
|
|
BumpCollectEpoch();
|
|
Require(UntrackedHint(hinted, hintedBytes) == threaded, "unwatching a hinted range again moved its hint");
|
|
Unwatch(base, Block);
|
|
const auto own = UntrackedHint(base, Block);
|
|
Require(own > threaded && UntrackedHint(hinted, hintedBytes) == threaded, "a range leaving the watch did not start a hint of its own");
|
|
GuestArena::GuestArenaReset_nid_postfix(const_cast<std::uint8_t*>(memory) + Block, hintedBytes);
|
|
GuestArena::GuestArenaCommit_nid_postfix(const_cast<std::uint8_t*>(memory) + Block, hintedBytes, PAGE_READWRITE, 16384);
|
|
BumpCollectEpoch();
|
|
const auto fresh = CollectWrites(hinted, hintedBytes);
|
|
Require(Watched(hinted, hintedBytes) && fresh != 0 && UnchangedSince(hinted, hintedBytes, fresh), "fresh backing of a hinted range is not watched");
|
|
memory[Block + 8] = 0x5a;
|
|
BumpCollectEpoch();
|
|
Require(UntrackedHint(hinted, hintedBytes) == 0, "watched fresh backing has an untracked hint");
|
|
CollectWritesUncached(hinted, hintedBytes);
|
|
Require(!UnchangedSince(hinted, Block, fresh), "an untracked hint walk took a CPU store from watched memory");
|
|
Unwatch(hinted, hintedBytes);
|
|
Require(UntrackedHint(hinted, hintedBytes) > own, "fresh backing leaving the watch did not start a new hint");
|
|
}
|
|
|
|
std::uint64_t ChildHostHole() {
|
|
std::uintptr_t arena = 0;
|
|
std::size_t arenaBytes = 0;
|
|
GuestArena::GuestArenaRange_nid_postfix(&arena, &arenaBytes);
|
|
return (arena + arenaBytes / 2) & ~(std::uint64_t{Block} - 1);
|
|
}
|
|
|
|
void CheckHostHoleInChild() {
|
|
std::array<wchar_t, 32768> executable{};
|
|
const DWORD length = GetModuleFileNameW(nullptr, executable.data(), static_cast<DWORD>(executable.size()));
|
|
Require(length != 0 && length < executable.size(), "cannot name the test executable");
|
|
const std::wstring command = L"\"" + std::wstring(executable.data(), length) + L"\" " + HostHoleMode;
|
|
std::vector<wchar_t> commandLine(command.begin(), command.end());
|
|
commandLine.push_back(L'\0');
|
|
STARTUPINFOW startup{};
|
|
startup.cb = sizeof(startup);
|
|
startup.dwFlags = STARTF_USESTDHANDLES;
|
|
startup.hStdInput = GetStdHandle(STD_INPUT_HANDLE);
|
|
startup.hStdOutput = GetStdHandle(STD_OUTPUT_HANDLE);
|
|
startup.hStdError = GetStdHandle(STD_ERROR_HANDLE);
|
|
PROCESS_INFORMATION process{};
|
|
Require(CreateProcessW(executable.data(), commandLine.data(), nullptr, nullptr, TRUE, CREATE_NO_WINDOW | CREATE_SUSPENDED, nullptr, nullptr, &startup, &process) != 0, "cannot create the host-hole child");
|
|
const bool reserved = VirtualAllocEx(process.hProcess, reinterpret_cast<void*>(ChildHostHole()), Block, MEM_RESERVE, PAGE_NOACCESS) != nullptr;
|
|
const bool resumed = reserved && ResumeThread(process.hThread) != static_cast<DWORD>(-1);
|
|
const bool exited = resumed && WaitForSingleObject(process.hProcess, 60000) == WAIT_OBJECT_0;
|
|
if (!exited) {
|
|
TerminateProcess(process.hProcess, 1);
|
|
WaitForSingleObject(process.hProcess, INFINITE);
|
|
}
|
|
DWORD exitCode = 1;
|
|
const bool reported = GetExitCodeProcess(process.hProcess, &exitCode) != 0;
|
|
CloseHandle(process.hThread);
|
|
CloseHandle(process.hProcess);
|
|
Require(reserved, "cannot reserve a host range in the child's arena interval");
|
|
Require(resumed, "cannot resume the host-hole child");
|
|
Require(exited, "the host-hole child did not exit");
|
|
Require(reported && exitCode == 0, "the host-hole child failed");
|
|
}
|
|
|
|
void CheckHostHole() {
|
|
constexpr std::size_t bytes = 64;
|
|
const auto hole = ChildHostHole();
|
|
Require(GuestArena::GuestArenaHostRegionOverlaps_nid_postfix(hole, bytes), "the range reserved before the arena is not an arena host region");
|
|
const auto before = TrackerGeneration();
|
|
Require(!Watched(hole, bytes), "an arena host hole reads as watched");
|
|
Require(CollectWrites(hole, bytes) == 0 && CollectWritesUncached(hole, bytes) == 0, "an arena host hole was collected");
|
|
auto* watched = static_cast<std::uint8_t*>(AllocateWatched(Block, true));
|
|
struct Cleanup {
|
|
void* memory;
|
|
~Cleanup() { GuestArena::GuestArenaRelease_nid_postfix(memory, Block); }
|
|
} cleanup{watched};
|
|
const auto base = reinterpret_cast<std::uint64_t>(watched);
|
|
for (unsigned epoch = 0; epoch < 2; ++epoch) {
|
|
BumpCollectEpoch();
|
|
watched[7] ^= 1;
|
|
Require(CollectWrites(base + 7, 1) != 0, "a warm host-hole check could not collect its watched range");
|
|
for (unsigned repeat = 0; repeat < 3; ++repeat) {
|
|
Require(CollectWrites(base + 7, 1) != 0, "a warm host-hole check lost its watched range");
|
|
Require(CollectWrites(hole, bytes) == 0, "a repeated host-hole query hit a collect memo");
|
|
Require(CollectWrites(hole + 7, 1) == 0, "a page-rounded host-hole query hit a collect memo");
|
|
}
|
|
}
|
|
Require(StoredOver(hole, bytes, before), "an arena host hole reads as not stored over");
|
|
Require(!UnchangedSince(hole, bytes, before), "an arena host hole reads as unchanged");
|
|
const std::array queries{UnchangedQuery{hole, bytes, before}};
|
|
Require(!UnchangedSinceAll(queries), "an arena host hole reads as unchanged in a batch");
|
|
Require(!UnchangedSinceCollected(hole, bytes, before), "an arena host hole reads as unchanged since a collect");
|
|
Require(MarkWritten(hole, bytes) == 0, "a driver store into an arena host hole is stamped");
|
|
Require(StoreOwnBytes(hole, bytes, [] {}) == 0, "an own store into an arena host hole is stamped");
|
|
Require(!WrittenSince(hole, bytes, before), "an arena host hole reads its stamps as written");
|
|
std::array<std::uint64_t, 1> generations{before};
|
|
std::array<std::uint8_t, 1> changed{};
|
|
std::array<std::uint8_t, 1> cpu{};
|
|
Require(!ChangedBlocks(hole, bytes, generations, changed, cpu) && changed[0] == BlockWritten && cpu[0] == 1, "an arena host hole uses block stamps");
|
|
bool imported = false;
|
|
Require(ImportWatched(hole, bytes, [&] {
|
|
imported = true;
|
|
return true;
|
|
}) && imported, "an import into an arena host hole did not run");
|
|
Require(!Watched(hole, bytes), "an import made an arena host hole watched");
|
|
}
|
|
#endif
|
|
|
|
void CheckVersionRanges() {
|
|
constexpr std::size_t count = 80;
|
|
constexpr auto bytes = count * Block;
|
|
auto* memory = static_cast<std::uint8_t*>(AllocateWatched(bytes, true));
|
|
struct Cleanup {
|
|
void* memory;
|
|
~Cleanup() {
|
|
#ifdef _WIN32
|
|
GuestArena::GuestArenaRelease_nid_postfix(memory, bytes);
|
|
#else
|
|
GuestWriteWatch::GuestWriteWatchUnregister_nid_postfix(memory, bytes);
|
|
munmap(memory, bytes);
|
|
#endif
|
|
}
|
|
} cleanup{memory};
|
|
const auto base = reinterpret_cast<std::uint64_t>(memory);
|
|
Require(UnchangedSince(base, bytes, TrackerGeneration()), "a new range has newer version stamps");
|
|
std::memset(memory, 17, bytes);
|
|
const auto initial = CollectWritesUncached(base, bytes);
|
|
Require(initial != 0, "version ranges could not be collected");
|
|
struct Write { std::size_t block; std::uint64_t generation; };
|
|
std::vector<Write> history;
|
|
std::vector<std::uint64_t> checkpoints{initial};
|
|
std::uint32_t random = 0x61387a29;
|
|
const auto next = [&] { random = random * 1664525u + 1013904223u; return random; };
|
|
const auto expected = [&](const UnchangedQuery& query) {
|
|
if (query.generation == 0) return false;
|
|
for (const auto& write : history) {
|
|
const auto begin = base + write.block * Block;
|
|
if (write.generation > query.generation && begin < query.address + query.bytes && query.address < begin + Block) return false;
|
|
}
|
|
return true;
|
|
};
|
|
for (unsigned step = 0; step < 512; ++step) {
|
|
const auto block = step < 3 ? step : next() % count;
|
|
std::uint64_t generation;
|
|
if (step % 3 == 0) {
|
|
memory[block * Block + 9] ^= 1;
|
|
generation = CollectWritesUncached(base + block * Block, Block);
|
|
} else generation = MarkWritten(base + block * Block + 13, 4);
|
|
Require(generation > checkpoints.back(), "version range write did not advance the tracker");
|
|
history.push_back({block, generation});
|
|
checkpoints.push_back(generation);
|
|
for (unsigned check = 0; check < 16; ++check) {
|
|
std::array<UnchangedQuery, 3> queries;
|
|
bool all = true;
|
|
for (auto& query : queries) {
|
|
const auto offset = next() % bytes;
|
|
query = {base + offset, 1 + next() % (bytes - offset), checkpoints[next() % checkpoints.size()]};
|
|
const auto same = expected(query);
|
|
Require(UnchangedSince(query.address, query.bytes, query.generation) == same, "version range disagrees with write history");
|
|
all = all && same;
|
|
}
|
|
Require(UnchangedSinceAll(queries) == all, "batched version ranges disagree with write history");
|
|
}
|
|
}
|
|
Require(!UnchangedSince(base, bytes, 0), "an unknown generation was accepted");
|
|
Require(UnchangedSince(base, bytes, checkpoints.back()), "the latest checkpoint was rejected");
|
|
}
|
|
|
|
void CheckCollectBoundaries() {
|
|
constexpr std::size_t bytes = 3 * Block;
|
|
auto* memory = static_cast<std::uint8_t*>(AllocateWatched(bytes));
|
|
struct Cleanup {
|
|
void* memory;
|
|
~Cleanup() {
|
|
#ifdef _WIN32
|
|
GuestArena::GuestArenaRelease_nid_postfix(memory, bytes);
|
|
#else
|
|
Unwatch(reinterpret_cast<std::uint64_t>(memory), bytes);
|
|
munmap(memory, bytes);
|
|
#endif
|
|
}
|
|
} cleanup{memory};
|
|
const auto base = reinterpret_cast<std::uint64_t>(memory);
|
|
std::memset(memory, 17, bytes);
|
|
bool unboundedObserved = false;
|
|
std::thread observer([&] {
|
|
const auto before = CollectWrites(base + 7, 1);
|
|
memory[7] = 19;
|
|
const auto after = CollectWrites(base + 7, 1);
|
|
unboundedObserved = before != 0 && after > before && !UnchangedSince(base + 7, 1, before);
|
|
});
|
|
observer.join();
|
|
Require(unboundedObserved, "a thread without collect epochs reused a stale observation");
|
|
for (const auto offset : {7u, 4096u + 3u, static_cast<unsigned>(Block - 8), static_cast<unsigned>(Block + 3)}) {
|
|
BumpCollectEpoch();
|
|
const auto before = CollectWrites(base + offset, 16);
|
|
Require(before != 0, "an epoch lost watched coverage");
|
|
memory[offset] ^= 1;
|
|
BumpCollectEpoch();
|
|
Require(CollectWrites(base + offset, 16) > before && !UnchangedSince(base + offset, 16, before), "a new epoch missed a CPU write");
|
|
const auto observed = TrackerGeneration();
|
|
memory[offset + 1] ^= 1;
|
|
Require(CollectWritesUncached(base + offset, 16) > observed && !UnchangedSince(base + offset, 16, observed), "an uncached observation reused an epoch result");
|
|
const auto stored = MarkWritten(base + offset + 2, 1);
|
|
Require(CollectWrites(base + offset, 16) >= stored && !UnchangedSince(base + offset, 16, observed), "a memoized observation hid a driver write");
|
|
}
|
|
#ifndef _WIN32
|
|
BumpCollectEpoch();
|
|
Require(CollectWrites(base, 1) != 0, "initial partial-block observation failed");
|
|
Unwatch(base + 4096, 4096);
|
|
Require(CollectWrites(base + 4096, 1) == 0, "an unwatched neighbor retained an epoch observation");
|
|
BumpCollectEpoch();
|
|
const auto before = CollectWrites(base, 16);
|
|
Require(before != 0, "an unwatched neighbor prevented collecting a watched prefix");
|
|
memory[0] ^= 1;
|
|
BumpCollectEpoch();
|
|
Require(CollectWrites(base, 16) > before && !UnchangedSince(base, 16, before), "partial-block collection missed a CPU write");
|
|
GuestWriteWatch::GuestWriteWatchRegister_nid_postfix(memory + 4096, 4096);
|
|
Require(CollectWrites(base + 4096, 1) != 0, "a re-registered neighbor stayed unwatched");
|
|
#endif
|
|
}
|
|
}
|
|
|
|
void CheckImportWindow() {
|
|
void* memory = AllocateWatched(3 * Block);
|
|
const auto base = reinterpret_cast<std::uint64_t>(memory);
|
|
auto* bytes = static_cast<volatile std::uint8_t*>(memory);
|
|
std::memset(memory, 0x11, 3 * Block);
|
|
const auto synced = CollectWritesUncached(base, 3 * Block);
|
|
Require(synced != 0, "the import window block is not collected");
|
|
Require(ImportWatched(base, 3 * Block, [&] {
|
|
bytes[0x100] = 0x11;
|
|
bytes[Block + 0x2000] = 0x22;
|
|
return true;
|
|
}), "the import window import failed");
|
|
Require(Watched(base, 3 * Block), "an import window left its range unwatched");
|
|
const std::array<std::uint64_t, 3> generations{synced, synced, synced};
|
|
std::array<std::uint8_t, 3> changed{};
|
|
std::array<std::uint8_t, 3> cpu{};
|
|
Require(ChangedBlocks(base, 3 * Block, generations, changed, cpu), "the import window block is not tracked");
|
|
Require(changed[0] == BlockUnchanged && UnchangedSince(base, Block, synced), "a page an import window resolved without changing its bytes reads as written");
|
|
Require(changed[1] == BlockWritten && WrittenSince(base + Block, Block, synced) && cpu[1] == 1, "a store of new bytes within an import window was missed");
|
|
Require(changed[2] == BlockUnchanged && cpu[2] == 0, "a block the import window did not touch reads as written");
|
|
Require(cpu[0] == 1, "a page an import window resolved no longer counts as possibly touched by the CPU");
|
|
const auto after = CollectWritesUncached(base, 3 * Block);
|
|
bytes[0x100] = 0x33;
|
|
static_cast<void>(CollectWritesUncached(base, 3 * Block));
|
|
Require(!UnchangedSince(base, Block, after), "a store after the import window was missed");
|
|
}
|
|
|
|
void CheckImportWindowOtherThread() {
|
|
void* memory = AllocateWatched(2 * Block);
|
|
const auto base = reinterpret_cast<std::uint64_t>(memory);
|
|
auto* bytes = static_cast<volatile std::uint8_t*>(memory);
|
|
std::memset(memory, 0x11, 2 * Block);
|
|
const auto synced = CollectWritesUncached(base, 2 * Block);
|
|
Require(synced != 0, "the other-thread import window block is not collected");
|
|
Require(ImportWatched(base, 2 * Block, [&] {
|
|
std::thread store([&] {
|
|
bytes[0x100] = 0x11;
|
|
bytes[Block + 0x100] = 0x77;
|
|
});
|
|
store.join();
|
|
return true;
|
|
}), "the other-thread import window import failed");
|
|
const std::array<std::uint64_t, 2> generations{synced, synced};
|
|
std::array<std::uint8_t, 2> changed{};
|
|
std::array<std::uint8_t, 2> cpu{};
|
|
Require(ChangedBlocks(base, 2 * Block, generations, changed, cpu), "the other-thread import window block is not tracked");
|
|
Require(changed[0] == BlockUnchanged && cpu[0] == 1, "a same-value store from another thread within an import window lost its possible CPU touch");
|
|
Require(changed[1] == BlockWritten && WrittenSince(base + Block, Block, synced) && cpu[1] == 1, "a store of new bytes from another thread within an import window was missed");
|
|
}
|
|
|
|
void CheckImportWindowZeroPages() {
|
|
void* memory = AllocateWatched(5 * Block);
|
|
const auto base = reinterpret_cast<std::uint64_t>(memory);
|
|
auto* bytes = static_cast<volatile std::uint8_t*>(memory);
|
|
auto* plain = static_cast<std::uint8_t*>(memory);
|
|
std::memset(plain, 0x11, Block);
|
|
std::memset(plain + Block, 0, 2 * Block);
|
|
std::memset(plain + 3 * Block, 0x44, Block);
|
|
std::memset(plain + 4 * Block, 0x66, Block);
|
|
const auto synced = CollectWritesUncached(base, 5 * Block);
|
|
Require(synced != 0, "the zero page import window block is not collected");
|
|
Require(ImportWatched(base, 5 * Block, [&] {
|
|
bytes[0x100] = 0x11;
|
|
bytes[Block + 0x100] = 0;
|
|
bytes[2 * Block + 0x2000] = 0x22;
|
|
bytes[3 * Block + 0x3000] = 0x44;
|
|
bytes[4 * Block + 0x100] = 0x55;
|
|
return true;
|
|
}), "the zero page import window import failed");
|
|
const std::array<std::uint64_t, 5> generations{synced, synced, synced, synced, synced};
|
|
std::array<std::uint8_t, 5> changed{};
|
|
std::array<std::uint8_t, 5> cpu{};
|
|
Require(ChangedBlocks(base, 5 * Block, generations, changed, cpu), "the zero page import window block is not tracked");
|
|
Require(changed[0] == BlockUnchanged && cpu[0] == 1, "a page before the zero pages of an import window reads as written");
|
|
Require(changed[1] == BlockUnchanged && UnchangedSince(base + Block, Block, synced), "a zero page an import window resolved without changing its bytes reads as written");
|
|
Require(changed[2] == BlockWritten && WrittenSince(base + 2 * Block, Block, synced), "a store of new bytes to a zero page within an import window was missed");
|
|
Require(changed[3] == BlockUnchanged && UnchangedSince(base + 3 * Block, Block, synced), "a page after the zero pages of an import window was compared with other bytes");
|
|
Require(changed[4] == BlockWritten && WrittenSince(base + 4 * Block, Block, synced), "a store of new bytes after the zero pages of an import window was missed");
|
|
}
|
|
|
|
void ProtectPage(std::uint64_t address, bool readable) {
|
|
#ifdef _WIN32
|
|
DWORD previous = 0;
|
|
Require(VirtualProtect(reinterpret_cast<void*>(address), 4096, readable ? PAGE_READWRITE : PAGE_NOACCESS, &previous) != 0, "cannot change the protection of a test page");
|
|
#else
|
|
Require(mprotect(reinterpret_cast<void*>(address), 4096, readable ? PROT_READ | PROT_WRITE : PROT_NONE) == 0, "cannot change the protection of a test page");
|
|
#endif
|
|
GuestAllocations::GuestAllocationsInvalidate_nid_postfix(static_cast<std::uintptr_t>(address), 4096);
|
|
}
|
|
|
|
void CheckUnwatchedImport() {
|
|
void* memory = AllocateWatched(3 * Block);
|
|
const auto base = reinterpret_cast<std::uint64_t>(memory);
|
|
auto* bytes = static_cast<volatile std::uint8_t*>(memory);
|
|
std::memset(memory, 0x11, 3 * Block);
|
|
const auto synced = CollectWritesUncached(base, 3 * Block);
|
|
Require(synced != 0, "the unwatched import block is not collected");
|
|
const auto imported = base + Block / 2;
|
|
const std::size_t importedBytes = Block + Block / 2;
|
|
const auto unreadable = base + Block + 0x3000;
|
|
ProtectPage(unreadable, false);
|
|
bool threw = false;
|
|
bool ran = false;
|
|
try {
|
|
static_cast<void>(ImportWatched(imported, importedBytes, [&] {
|
|
ran = true;
|
|
return true;
|
|
}));
|
|
} catch (const std::runtime_error&) {
|
|
threw = true;
|
|
}
|
|
Require(threw && !ran, "an import that stays watched did not read its range before the import");
|
|
threw = false;
|
|
try {
|
|
Require(ImportWatched(imported, importedBytes, [&] {
|
|
bytes[Block / 2 + 0x100] = 0x22;
|
|
ran = true;
|
|
return true;
|
|
}, false), "an import that leaves the watch failed");
|
|
} catch (const std::runtime_error&) {
|
|
threw = true;
|
|
}
|
|
Require(!threw && ran, "an import that leaves the watch read its range");
|
|
ProtectPage(unreadable, true);
|
|
Require(!Watched(imported, importedBytes) && !Watched(imported, 4096) && !Watched(base + Block, Block), "an import that leaves the watch is still watched");
|
|
Require(Watched(base + 2 * Block, Block), "an import that leaves the watch unwatched a block outside its range");
|
|
Require(UnchangedSince(base + 2 * Block, Block, synced), "an import that leaves the watch stamped a block outside its range");
|
|
#ifndef _WIN32
|
|
Require(Watched(base, Block / 2), "an import that leaves the watch unwatched the pages before its range");
|
|
const std::array<std::uint64_t, 1> generations{synced};
|
|
std::array<std::uint8_t, 1> changed{};
|
|
std::array<std::uint8_t, 1> cpu{};
|
|
Require(ChangedBlocks(base, Block / 2, generations, changed, cpu), "the pages before an import that leaves the watch are not tracked");
|
|
Require(changed[0] == BlockUnchanged && UnchangedSince(base, Block / 2, synced) && !WrittenSince(base, Block / 2, synced), "a store to a page that left the watch reads as a store to the watched pages of its block");
|
|
Require(cpu[0] == 1, "a page resolved while an import left the watch no longer counts as possibly touched by the CPU");
|
|
const auto after = CollectWritesUncached(base, Block / 2);
|
|
bytes[0x100] = 0x33;
|
|
static_cast<void>(CollectWritesUncached(base, Block / 2));
|
|
Require(after != 0 && !UnchangedSince(base, Block / 2, after), "a store beside an import that left the watch was missed");
|
|
#endif
|
|
}
|
|
|
|
class PartlyCommitted {
|
|
public:
|
|
static constexpr std::size_t Bytes = 4 * Block;
|
|
|
|
PartlyCommitted() {
|
|
#ifdef _WIN32
|
|
memory = static_cast<std::uint8_t*>(GuestArena::GuestArenaAllocateAtOrAbove_nid_postfix(GuestArena::GuestArenaHighestFree_nid_no_patch(Bytes, Block), Bytes, Block));
|
|
#else
|
|
void* raw = mmap(nullptr, Bytes + Block, PROT_NONE, MAP_PRIVATE | MAP_ANONYMOUS | MAP_NORESERVE, -1, 0);
|
|
Require(raw != MAP_FAILED, "cannot reserve the partly committed range");
|
|
const auto begin = reinterpret_cast<std::uintptr_t>(raw);
|
|
const auto aligned = (begin + Block - 1) & ~static_cast<std::uintptr_t>(Block - 1);
|
|
if (aligned != begin) munmap(raw, aligned - begin);
|
|
if (aligned + Bytes != begin + Bytes + Block) munmap(reinterpret_cast<void*>(aligned + Bytes), begin + Block - aligned);
|
|
memory = reinterpret_cast<std::uint8_t*>(aligned);
|
|
#endif
|
|
Require(memory != nullptr, "cannot reserve the partly committed range");
|
|
}
|
|
|
|
~PartlyCommitted() {
|
|
#ifdef _WIN32
|
|
GuestArena::GuestArenaReset_nid_postfix(memory, Bytes);
|
|
GuestAllocations::GuestAllocationsInvalidate_nid_postfix(Address(), Bytes);
|
|
GuestArena::GuestArenaRelease_nid_postfix(memory, Bytes);
|
|
#else
|
|
GuestWriteWatch::GuestWriteWatchUnregister_nid_postfix(memory, Bytes);
|
|
munmap(memory, Bytes);
|
|
GuestAllocations::GuestAllocationsInvalidate_nid_postfix(Address(), Bytes);
|
|
#endif
|
|
}
|
|
|
|
PartlyCommitted(const PartlyCommitted&) = delete;
|
|
PartlyCommitted& operator=(const PartlyCommitted&) = delete;
|
|
|
|
void Commit(std::size_t block) {
|
|
#ifdef _WIN32
|
|
GuestArena::GuestArenaCommit_nid_postfix(memory + block * Block, Block, PAGE_READWRITE, Block);
|
|
#else
|
|
Require(mmap(memory + block * Block, Block, PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_ANONYMOUS | MAP_FIXED, -1, 0) != MAP_FAILED, "cannot commit a block of the partly committed range");
|
|
GuestWriteWatch::GuestWriteWatchRegister_nid_postfix(memory + block * Block, Block);
|
|
#endif
|
|
GuestAllocations::GuestAllocationsInvalidate_nid_postfix(Address(block), Block);
|
|
}
|
|
|
|
void Decommit(std::size_t block) {
|
|
#ifdef _WIN32
|
|
GuestArena::GuestArenaReset_nid_postfix(memory + block * Block, Block);
|
|
#else
|
|
GuestWriteWatch::GuestWriteWatchUnregister_nid_postfix(memory + block * Block, Block);
|
|
Require(mmap(memory + block * Block, Block, PROT_NONE, MAP_PRIVATE | MAP_ANONYMOUS | MAP_NORESERVE | MAP_FIXED, -1, 0) != MAP_FAILED, "cannot decommit a block of the partly committed range");
|
|
#endif
|
|
GuestAllocations::GuestAllocationsInvalidate_nid_postfix(Address(block), Block);
|
|
}
|
|
|
|
std::uint8_t* Data() const { return memory; }
|
|
std::uint64_t Address(std::size_t block = 0) const { return reinterpret_cast<std::uint64_t>(memory) + block * Block; }
|
|
|
|
private:
|
|
std::uint8_t* memory = nullptr;
|
|
};
|
|
|
|
using Runs = std::vector<std::pair<std::uint64_t, std::uint64_t>>;
|
|
|
|
std::uint64_t CollectCommitted(const PartlyCommitted& range, Runs& runs) {
|
|
BumpCollectEpoch();
|
|
return CollectCommittedWrites(range.Address(), PartlyCommitted::Bytes, runs);
|
|
}
|
|
|
|
void CheckCommittedRanges() {
|
|
PartlyCommitted range;
|
|
const auto base = range.Address();
|
|
range.Commit(0);
|
|
std::memset(range.Data(), 0x11, Block);
|
|
Require(CollectWrites(base, PartlyCommitted::Bytes) == 0, "a partly committed range was collected as a whole");
|
|
Runs runs;
|
|
const Runs first{{base, base + Block}};
|
|
const auto synced = CollectCommitted(range, runs);
|
|
Require(synced != 0 && runs == first, "the committed part of a partly committed range was not collected");
|
|
Require(UnchangedCommittedSince(runs, synced), "a collected committed part reads as changed");
|
|
|
|
range.Data()[8] = 0x22;
|
|
const auto written = CollectCommitted(range, runs);
|
|
Require(written > synced && runs == first && !UnchangedCommittedSince(runs, synced) && UnchangedCommittedSince(runs, written), "a CPU write to the committed part was missed");
|
|
Require(MarkWritten(base + 16, 4) != 0 && !UnchangedCommittedSince(first, written), "a driver store into the committed part was missed");
|
|
Require(UnchangedCommittedSince(first, CollectCommitted(range, runs)), "a collect after a driver store reads the committed part as changed");
|
|
|
|
const auto beforeCommit = CollectCommitted(range, runs);
|
|
range.Commit(2);
|
|
const Runs both{{base, base + Block}, {range.Address(2), range.Address(3)}};
|
|
const auto grown = CollectCommitted(range, runs);
|
|
Require(grown != 0 && runs == both, "a block committed inside the range is not described");
|
|
Require(!UnchangedCommittedSince(runs, beforeCommit), "a block committed inside the range reads as unchanged since before the commit");
|
|
Require(UnchangedCommittedSince(runs, grown), "the committed parts read as changed after their collect");
|
|
|
|
range.Decommit(2);
|
|
range.Commit(2);
|
|
const auto recommitted = CollectCommitted(range, runs);
|
|
Require(recommitted != 0 && runs == both && !UnchangedCommittedSince(runs, grown), "a block decommitted and committed again reads as unchanged");
|
|
|
|
range.Decommit(2);
|
|
Require(CollectCommitted(range, runs) != 0 && runs == first, "a decommitted block is still described as committed");
|
|
|
|
#ifdef _WIN32
|
|
HANDLE firstSection = CreateFileMappingW(INVALID_HANDLE_VALUE, nullptr, PAGE_EXECUTE_READWRITE | SEC_RESERVE, 0, Block, nullptr);
|
|
HANDLE secondSection = CreateFileMappingW(INVALID_HANDLE_VALUE, nullptr, PAGE_EXECUTE_READWRITE | SEC_RESERVE, 0, Block, nullptr);
|
|
struct Sections {
|
|
HANDLE first;
|
|
HANDLE second;
|
|
~Sections() {
|
|
if (first != nullptr) CloseHandle(first);
|
|
if (second != nullptr) CloseHandle(second);
|
|
}
|
|
} sections{firstSection, secondSection};
|
|
Require(firstSection != nullptr && secondSection != nullptr, "cannot create the shared backings of the partly committed range");
|
|
const auto beforeMap = CollectCommitted(range, runs);
|
|
GuestArena::GuestArenaMap_nid_postfix(range.Data() + 3 * Block, Block, firstSection, 0, PAGE_READWRITE);
|
|
GuestAllocations::GuestAllocationsInvalidate_nid_postfix(range.Address(3), Block);
|
|
const Runs viewed{{base, base + Block}, {range.Address(3), range.Address(4)}};
|
|
const auto mapped = CollectCommitted(range, runs);
|
|
Require(mapped != 0 && runs == viewed, "a view mapped inside the range is not described");
|
|
Require(!UnchangedCommittedSince(runs, beforeMap), "a view mapped inside the range reads as unchanged since before the mapping");
|
|
Require(UnchangedCommittedSince(runs, mapped), "a collected view reads as changed");
|
|
GuestArena::GuestArenaReset_nid_postfix(range.Data() + 3 * Block, Block);
|
|
GuestArena::GuestArenaMap_nid_postfix(range.Data() + 3 * Block, Block, secondSection, 0, PAGE_READWRITE);
|
|
GuestAllocations::GuestAllocationsInvalidate_nid_postfix(range.Address(3), Block);
|
|
Require(CollectCommitted(range, runs) != 0 && runs == viewed && !UnchangedCommittedSince(runs, mapped), "a view replaced inside the range reads as unchanged");
|
|
GuestArena::GuestArenaReset_nid_postfix(range.Data() + 3 * Block, Block);
|
|
GuestAllocations::GuestAllocationsInvalidate_nid_postfix(range.Address(3), Block);
|
|
Require(CollectCommitted(range, runs) != 0 && runs == first, "an unmapped view is still described as committed");
|
|
#endif
|
|
|
|
range.Decommit(0);
|
|
Require(CollectCommitted(range, runs) != 0 && runs.empty() && UnchangedCommittedSince(runs, TrackerGeneration()), "a range with no committed page did not collect as empty");
|
|
Require(!UnchangedCommittedSince(first, 0), "an unknown generation was accepted for the committed parts");
|
|
}
|
|
|
|
int main() {
|
|
try {
|
|
if (!WriteWatched()) {
|
|
std::cout << "no write watching: skipped\n";
|
|
return 77;
|
|
}
|
|
#ifdef _WIN32
|
|
if (std::wstring_view(GetCommandLineW()).ends_with(HostHoleMode)) {
|
|
CheckHostHole();
|
|
return 0;
|
|
}
|
|
#endif
|
|
CheckSharedBlock();
|
|
CheckStoredAllSince();
|
|
CheckOwnStore();
|
|
CheckUnwatch();
|
|
CheckNewestStamp();
|
|
CheckPartlyWatchedStore();
|
|
#ifndef _WIN32
|
|
CheckWatchOverlaps();
|
|
#endif
|
|
#ifdef _WIN32
|
|
CheckDeferredSharedImports();
|
|
CheckPrivateMappingReuse();
|
|
CheckUntrackedHint();
|
|
CheckHostHoleInChild();
|
|
#endif
|
|
CheckVersionRanges();
|
|
CheckCollectBoundaries();
|
|
CheckImportWindow();
|
|
CheckImportWindowZeroPages();
|
|
CheckImportWindowOtherThread();
|
|
CheckUnwatchedImport();
|
|
CheckCommittedRanges();
|
|
} catch (const std::exception& error) {
|
|
std::cerr << "write tracking test failed: " << error.what() << "\n";
|
|
return 1;
|
|
}
|
|
std::cout << "write tracking tests passed\n";
|
|
return 0;
|
|
}
|