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Optional W^X policy for JIT pages (#112)

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pull/117/head
tevador 5 years ago committed by GitHub
parent 971f10c9c2
commit 67010ab554
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GPG Key ID: 4AEE18F83AFDEB23
12 changed files with 195 additions and 55 deletions
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2
src/dataset.cpp
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@ -140,8 +140,10 @@ namespace randomx {
void initCacheCompile(randomx_cache* cache, const void* key, size_t keySize) {
initCache(cache, key, keySize);
cache->jit->enableWriting();
cache->jit->generateSuperscalarHash(cache->programs, cache->reciprocalCache);
cache->jit->generateDatasetInitCode();
cache->jit->enableExecution();
}
constexpr uint64_t superscalarMul0 = 6364136223846793005ULL;

14
src/jit_compiler_x86.cpp
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@ -218,7 +218,7 @@ namespace randomx {
}
JitCompilerX86::JitCompilerX86() {
code = (uint8_t*)allocExecutableMemory(CodeSize);
code = (uint8_t*)allocMemoryPages(CodeSize);
memcpy(code, codePrologue, prologueSize);
memcpy(code + epilogueOffset, codeEpilogue, epilogueSize);
}
@ -227,6 +227,18 @@ namespace randomx {
freePagedMemory(code, CodeSize);
}
void JitCompilerX86::enableAll() {
setPagesRWX(code, CodeSize);
}
void JitCompilerX86::enableWriting() {
setPagesRW(code, CodeSize);
}
void JitCompilerX86::enableExecution() {
setPagesRX(code, CodeSize);
}
void JitCompilerX86::generateProgram(Program& prog, ProgramConfiguration& pcfg) {
generateProgramPrologue(prog, pcfg);
memcpy(code + codePos, codeReadDataset, readDatasetSize);

3
src/jit_compiler_x86.hpp
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@ -62,6 +62,9 @@ namespace randomx {
return code;
}
size_t getCodeSize();
void enableWriting();
void enableExecution();
void enableAll();
private:
static InstructionGeneratorX86 engine[256];
std::vector<int32_t> instructionOffsets;

56
src/randomx.cpp
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@ -175,11 +175,21 @@ extern "C" {
break;
case RANDOMX_FLAG_JIT:
vm = new randomx::CompiledLightVmDefault();
if (flags & RANDOMX_FLAG_SECURE) {
vm = new randomx::CompiledLightVmDefaultSecure();
}
else {
vm = new randomx::CompiledLightVmDefault();
}
break;
case RANDOMX_FLAG_FULL_MEM | RANDOMX_FLAG_JIT:
vm = new randomx::CompiledVmDefault();
if (flags & RANDOMX_FLAG_SECURE) {
vm = new randomx::CompiledVmDefaultSecure();
}
else {
vm = new randomx::CompiledVmDefault();
}
break;
case RANDOMX_FLAG_HARD_AES:
@ -191,11 +201,21 @@ extern "C" {
break;
case RANDOMX_FLAG_JIT | RANDOMX_FLAG_HARD_AES:
vm = new randomx::CompiledLightVmHardAes();
if (flags & RANDOMX_FLAG_SECURE) {
vm = new randomx::CompiledLightVmHardAesSecure();
}
else {
vm = new randomx::CompiledLightVmHardAes();
}
break;
case RANDOMX_FLAG_FULL_MEM | RANDOMX_FLAG_JIT | RANDOMX_FLAG_HARD_AES:
vm = new randomx::CompiledVmHardAes();
if (flags & RANDOMX_FLAG_SECURE) {
vm = new randomx::CompiledVmHardAesSecure();
}
else {
vm = new randomx::CompiledVmHardAes();
}
break;
case RANDOMX_FLAG_LARGE_PAGES:
@ -207,11 +227,21 @@ extern "C" {
break;
case RANDOMX_FLAG_JIT | RANDOMX_FLAG_LARGE_PAGES:
vm = new randomx::CompiledLightVmLargePage();
if (flags & RANDOMX_FLAG_SECURE) {
vm = new randomx::CompiledLightVmLargePageSecure();
}
else {
vm = new randomx::CompiledLightVmLargePage();
}
break;
case RANDOMX_FLAG_FULL_MEM | RANDOMX_FLAG_JIT | RANDOMX_FLAG_LARGE_PAGES:
vm = new randomx::CompiledVmLargePage();
if (flags & RANDOMX_FLAG_SECURE) {
vm = new randomx::CompiledVmLargePageSecure();
}
else {
vm = new randomx::CompiledVmLargePage();
}
break;
case RANDOMX_FLAG_HARD_AES | RANDOMX_FLAG_LARGE_PAGES:
@ -223,11 +253,21 @@ extern "C" {
break;
case RANDOMX_FLAG_JIT | RANDOMX_FLAG_HARD_AES | RANDOMX_FLAG_LARGE_PAGES:
vm = new randomx::CompiledLightVmLargePageHardAes();
if (flags & RANDOMX_FLAG_SECURE) {
vm = new randomx::CompiledLightVmLargePageHardAesSecure();
}
else {
vm = new randomx::CompiledLightVmLargePageHardAes();
}
break;
case RANDOMX_FLAG_FULL_MEM | RANDOMX_FLAG_JIT | RANDOMX_FLAG_HARD_AES | RANDOMX_FLAG_LARGE_PAGES:
vm = new randomx::CompiledVmLargePageHardAes();
if (flags & RANDOMX_FLAG_SECURE) {
vm = new randomx::CompiledVmLargePageHardAesSecure();
}
else {
vm = new randomx::CompiledVmLargePageHardAes();
}
break;
default:

7
src/randomx.h
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@ -44,6 +44,7 @@ typedef enum {
RANDOMX_FLAG_HARD_AES = 2,
RANDOMX_FLAG_FULL_MEM = 4,
RANDOMX_FLAG_JIT = 8,
RANDOMX_FLAG_SECURE = 16
} randomx_flags;
typedef struct randomx_dataset randomx_dataset;
@ -135,12 +136,14 @@ RANDOMX_EXPORT void randomx_release_dataset(randomx_dataset *dataset);
/**
* Creates and initializes a RandomX virtual machine.
*
* @param flags is any combination of these 4 flags (each flag can be set or not set):
* @param flags is any combination of these 5 flags (each flag can be set or not set):
* RANDOMX_FLAG_LARGE_PAGES - allocate scratchpad memory in large pages
* RANDOMX_FLAG_HARD_AES - virtual machine will use hardware accelerated AES
* RANDOMX_FLAG_FULL_MEM - virtual machine will use the full dataset
* RANDOMX_FLAG_JIT - virtual machine will use a JIT compiler
* The numeric values of the flags are ordered so that a higher value will provide
* RANDOMX_FLAG_SECURE - when combined with RANDOMX_FLAG_JIT, the JIT pages are never
* writable and executable at the same time (W^X policy)
* The numeric values of the first 4 flags are ordered so that a higher value will provide
* faster hash calculation and a lower numeric value will provide higher portability.
* Using RANDOMX_FLAG_DEFAULT (all flags not set) works on all platforms, but is the slowest.
* @param cache is a pointer to an initialized randomx_cache structure. Can be

11
src/tests/benchmark.cpp
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@ -82,6 +82,7 @@ void printUsage(const char* executable) {
std::cout << " --mine mining mode: 2080 MiB" << std::endl;
std::cout << " --verify verification mode: 256 MiB" << std::endl;
std::cout << " --jit x86-64 JIT compiled mode (default: interpreter)" << std::endl;
std::cout << " --secure W^X policy for JIT pages (default: off)" << std::endl;
std::cout << " --largePages use large pages" << std::endl;
std::cout << " --softAes use software AES (default: x86 AES-NI)" << std::endl;
std::cout << " --threads T use T threads (default: 1)" << std::endl;
@ -126,7 +127,7 @@ void mine(randomx_vm* vm, std::atomic<uint32_t>& atomicNonce, AtomicHash& result
}
int main(int argc, char** argv) {
bool softAes, miningMode, verificationMode, help, largePages, jit;
bool softAes, miningMode, verificationMode, help, largePages, jit, secure;
int noncesCount, threadCount, initThreadCount;
uint64_t threadAffinity;
int32_t seedValue;
@ -143,6 +144,7 @@ int main(int argc, char** argv) {
readOption("--largePages", argc, argv, largePages);
readOption("--jit", argc, argv, jit);
readOption("--help", argc, argv, help);
readOption("--secure", argc, argv, secure);
store32(&seed, seedValue);
@ -171,7 +173,12 @@ int main(int argc, char** argv) {
if (jit) {
flags = (randomx_flags)(flags | RANDOMX_FLAG_JIT);
std::cout << " - JIT compiled mode" << std::endl;
std::cout << " - JIT compiled mode ";
if (secure) {
flags = (randomx_flags)(flags | RANDOMX_FLAG_SECURE);
std::cout << "(secure)";
}
std::cout << std::endl;
}
else {
std::cout << " - interpreted mode" << std::endl;

38
src/virtual_memory.cpp
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@ -41,6 +41,10 @@ OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#ifndef MAP_ANONYMOUS
#define MAP_ANONYMOUS MAP_ANON
#endif
#define PAGE_READONLY PROT_READ
#define PAGE_READWRITE (PROT_READ | PROT_WRITE)
#define PAGE_EXECUTE_READ (PROT_READ | PROT_EXEC)
#define PAGE_EXECUTE_READWRITE (PROT_READ | PROT_WRITE | PROT_EXEC)
#endif
#if defined(_WIN32) || defined(__CYGWIN__)
@ -83,20 +87,44 @@ void setPrivilege(const char* pszPrivilege, BOOL bEnable) {
}
#endif
void* allocExecutableMemory(std::size_t bytes) {
void* allocMemoryPages(std::size_t bytes) {
void* mem;
#if defined(_WIN32) || defined(__CYGWIN__)
mem = VirtualAlloc(nullptr, bytes, MEM_COMMIT, PAGE_EXECUTE_READWRITE);
mem = VirtualAlloc(nullptr, bytes, MEM_COMMIT, PAGE_READWRITE);
if (mem == nullptr)
throw std::runtime_error(getErrorMessage("allocExecutableMemory - VirtualAlloc"));
throw std::runtime_error(getErrorMessage("allocMemoryPages - VirtualAlloc"));
#else
mem = mmap(nullptr, bytes, PROT_READ | PROT_WRITE | PROT_EXEC, MAP_ANONYMOUS | MAP_PRIVATE, -1, 0);
mem = mmap(nullptr, bytes, PAGE_READWRITE, MAP_ANONYMOUS | MAP_PRIVATE, -1, 0);
if (mem == MAP_FAILED)
throw std::runtime_error("allocExecutableMemory - mmap failed");
throw std::runtime_error("allocMemoryPages - mmap failed");
#endif
return mem;
}
static inline void pageProtect(void* ptr, std::size_t bytes, int rules) {
#if defined(_WIN32) || defined(__CYGWIN__)
DWORD oldp;
if (!VirtualProtect(ptr, bytes, (DWORD)rules, &oldp)) {
throw std::runtime_error(getErrorMessage("VirtualProtect"));
}
#else
if (-1 == mprotect(ptr, bytes, rules))
throw std::runtime_error("mprotect failed");
#endif
}
void setPagesRW(void* ptr, std::size_t bytes) {
pageProtect(ptr, bytes, PAGE_READWRITE);
}
void setPagesRX(void* ptr, std::size_t bytes) {
pageProtect(ptr, bytes, PAGE_EXECUTE_READ);
}
void setPagesRWX(void* ptr, std::size_t bytes) {
pageProtect(ptr, bytes, PAGE_EXECUTE_READWRITE);
}
void* allocLargePagesMemory(std::size_t bytes) {
void* mem;
#if defined(_WIN32) || defined(__CYGWIN__)

5
src/virtual_memory.hpp
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@ -34,6 +34,9 @@ constexpr std::size_t alignSize(std::size_t pos, std::size_t align) {
return ((pos - 1) / align + 1) * align;
}
void* allocExecutableMemory(std::size_t);
void* allocMemoryPages(std::size_t);
void setPagesRW(void*, std::size_t);
void setPagesRX(void*, std::size_t);
void setPagesRWX(void*, std::size_t);
void* allocLargePagesMemory(std::size_t);
void freePagedMemory(void*, std::size_t);

37
src/vm_compiled.cpp
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@ -34,27 +34,44 @@ namespace randomx {
static_assert(sizeof(MemoryRegisters) == 2 * sizeof(addr_t) + sizeof(uintptr_t), "Invalid alignment of struct randomx::MemoryRegisters");
static_assert(sizeof(RegisterFile) == 256, "Invalid alignment of struct randomx::RegisterFile");
template<class Allocator, bool softAes>
void CompiledVm<Allocator, softAes>::setDataset(randomx_dataset* dataset) {
template<class Allocator, bool softAes, bool secureJit>
CompiledVm<Allocator, softAes, secureJit>::CompiledVm() {
if (!secureJit) {
compiler.enableAll(); //make JIT buffer both writable and executable
}
}
template<class Allocator, bool softAes, bool secureJit>
void CompiledVm<Allocator, softAes, secureJit>::setDataset(randomx_dataset* dataset) {
datasetPtr = dataset;
}
template<class Allocator, bool softAes>
void CompiledVm<Allocator, softAes>::run(void* seed) {
template<class Allocator, bool softAes, bool secureJit>
void CompiledVm<Allocator, softAes, secureJit>::run(void* seed) {
VmBase<Allocator, softAes>::generateProgram(seed);
randomx_vm::initialize();
if (secureJit) {
compiler.enableWriting();
}
compiler.generateProgram(program, config);
if (secureJit) {
compiler.enableExecution();
}
mem.memory = datasetPtr->memory + datasetOffset;
execute();
}
template<class Allocator, bool softAes>
void CompiledVm<Allocator, softAes>::execute() {
template<class Allocator, bool softAes, bool secureJit>
void CompiledVm<Allocator, softAes, secureJit>::execute() {
compiler.getProgramFunc()(reg, mem, scratchpad, RANDOMX_PROGRAM_ITERATIONS);
}
template class CompiledVm<AlignedAllocator<CacheLineSize>, false>;
template class CompiledVm<AlignedAllocator<CacheLineSize>, true>;
template class CompiledVm<LargePageAllocator, false>;
template class CompiledVm<LargePageAllocator, true>;
template class CompiledVm<AlignedAllocator<CacheLineSize>, false, false>;
template class CompiledVm<AlignedAllocator<CacheLineSize>, true, false>;
template class CompiledVm<LargePageAllocator, false, false>;
template class CompiledVm<LargePageAllocator, true, false>;
template class CompiledVm<AlignedAllocator<CacheLineSize>, false, true>;
template class CompiledVm<AlignedAllocator<CacheLineSize>, true, true>;
template class CompiledVm<LargePageAllocator, false, true>;
template class CompiledVm<LargePageAllocator, true, true>;
}

15
src/vm_compiled.hpp
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@ -37,7 +37,7 @@ OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
namespace randomx {
template<class Allocator, bool softAes>
template<class Allocator, bool softAes, bool secureJit>
class CompiledVm : public VmBase<Allocator, softAes> {
public:
void* operator new(size_t size) {
@ -49,6 +49,7 @@ namespace randomx {
void operator delete(void* ptr) {
AlignedAllocator<CacheLineSize>::freeMemory(ptr, sizeof(CompiledVm));
}
CompiledVm();
void setDataset(randomx_dataset* dataset) override;
void run(void* seed) override;
@ -65,8 +66,12 @@ namespace randomx {
JitCompiler compiler;
};
using CompiledVmDefault = CompiledVm<AlignedAllocator<CacheLineSize>, true>;
using CompiledVmHardAes = CompiledVm<AlignedAllocator<CacheLineSize>, false>;
using CompiledVmLargePage = CompiledVm<LargePageAllocator, true>;
using CompiledVmLargePageHardAes = CompiledVm<LargePageAllocator, false>;
using CompiledVmDefault = CompiledVm<AlignedAllocator<CacheLineSize>, true, false>;
using CompiledVmHardAes = CompiledVm<AlignedAllocator<CacheLineSize>, false, false>;
using CompiledVmLargePage = CompiledVm<LargePageAllocator, true, false>;
using CompiledVmLargePageHardAes = CompiledVm<LargePageAllocator, false, false>;
using CompiledVmDefaultSecure = CompiledVm<AlignedAllocator<CacheLineSize>, true, true>;
using CompiledVmHardAesSecure = CompiledVm<AlignedAllocator<CacheLineSize>, false, true>;
using CompiledVmLargePageSecure = CompiledVm<LargePageAllocator, true, true>;
using CompiledVmLargePageHardAesSecure = CompiledVm<LargePageAllocator, false, true>;
}

34
src/vm_compiled_light.cpp
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@ -32,23 +32,39 @@ OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
namespace randomx {
template<class Allocator, bool softAes>
void CompiledLightVm<Allocator, softAes>::setCache(randomx_cache* cache) {
template<class Allocator, bool softAes, bool secureJit>
void CompiledLightVm<Allocator, softAes, secureJit>::setCache(randomx_cache* cache) {
cachePtr = cache;
mem.memory = cache->memory;
if (secureJit) {
compiler.enableWriting();
}
compiler.generateSuperscalarHash(cache->programs, cache->reciprocalCache);
if (secureJit) {
compiler.enableExecution();
}
}
template<class Allocator, bool softAes>
void CompiledLightVm<Allocator, softAes>::run(void* seed) {
template<class Allocator, bool softAes, bool secureJit>
void CompiledLightVm<Allocator, softAes, secureJit>::run(void* seed) {
VmBase<Allocator, softAes>::generateProgram(seed);
randomx_vm::initialize();
if (secureJit) {
compiler.enableWriting();
}
compiler.generateProgramLight(program, config, datasetOffset);
CompiledVm<Allocator, softAes>::execute();
if (secureJit) {
compiler.enableExecution();
}
CompiledVm<Allocator, softAes, secureJit>::execute();
}
template class CompiledLightVm<AlignedAllocator<CacheLineSize>, false>;
template class CompiledLightVm<AlignedAllocator<CacheLineSize>, true>;
template class CompiledLightVm<LargePageAllocator, false>;
template class CompiledLightVm<LargePageAllocator, true>;
template class CompiledLightVm<AlignedAllocator<CacheLineSize>, false, false>;
template class CompiledLightVm<AlignedAllocator<CacheLineSize>, true, false>;
template class CompiledLightVm<LargePageAllocator, false, false>;
template class CompiledLightVm<LargePageAllocator, true, false>;
template class CompiledLightVm<AlignedAllocator<CacheLineSize>, false, true>;
template class CompiledLightVm<AlignedAllocator<CacheLineSize>, true, true>;
template class CompiledLightVm<LargePageAllocator, false, true>;
template class CompiledLightVm<LargePageAllocator, true, true>;
}

28
src/vm_compiled_light.hpp
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@ -33,8 +33,8 @@ OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
namespace randomx {
template<class Allocator, bool softAes>
class CompiledLightVm : public CompiledVm<Allocator, softAes> {
template<class Allocator, bool softAes, bool secureJit>
class CompiledLightVm : public CompiledVm<Allocator, softAes, secureJit> {
public:
void* operator new(size_t size) {
void* ptr = AlignedAllocator<CacheLineSize>::allocMemory(size);
@ -49,16 +49,20 @@ namespace randomx {
void setDataset(randomx_dataset* dataset) override { }
void run(void* seed) override;
using CompiledVm<Allocator, softAes>::mem;
using CompiledVm<Allocator, softAes>::compiler;
using CompiledVm<Allocator, softAes>::program;
using CompiledVm<Allocator, softAes>::config;
using CompiledVm<Allocator, softAes>::cachePtr;
using CompiledVm<Allocator, softAes>::datasetOffset;
using CompiledVm<Allocator, softAes, secureJit>::mem;
using CompiledVm<Allocator, softAes, secureJit>::compiler;
using CompiledVm<Allocator, softAes, secureJit>::program;
using CompiledVm<Allocator, softAes, secureJit>::config;
using CompiledVm<Allocator, softAes, secureJit>::cachePtr;
using CompiledVm<Allocator, softAes, secureJit>::datasetOffset;
};
using CompiledLightVmDefault = CompiledLightVm<AlignedAllocator<CacheLineSize>, true>;
using CompiledLightVmHardAes = CompiledLightVm<AlignedAllocator<CacheLineSize>, false>;
using CompiledLightVmLargePage = CompiledLightVm<LargePageAllocator, true>;
using CompiledLightVmLargePageHardAes = CompiledLightVm<LargePageAllocator, false>;
using CompiledLightVmDefault = CompiledLightVm<AlignedAllocator<CacheLineSize>, true, false>;
using CompiledLightVmHardAes = CompiledLightVm<AlignedAllocator<CacheLineSize>, false, false>;
using CompiledLightVmLargePage = CompiledLightVm<LargePageAllocator, true, false>;
using CompiledLightVmLargePageHardAes = CompiledLightVm<LargePageAllocator, false, false>;
using CompiledLightVmDefaultSecure = CompiledLightVm<AlignedAllocator<CacheLineSize>, true, true>;
using CompiledLightVmHardAesSecure = CompiledLightVm<AlignedAllocator<CacheLineSize>, false, true>;
using CompiledLightVmLargePageSecure = CompiledLightVm<LargePageAllocator, true, true>;
using CompiledLightVmLargePageHardAesSecure = CompiledLightVm<LargePageAllocator, false, true>;
}
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