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//===-- interception_win_test.cc ------------------------------------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file is a part of ThreadSanitizer/AddressSanitizer runtime.
// Tests for interception_win.h.
//
//===----------------------------------------------------------------------===//
#include "interception/interception.h"
#include "gtest/gtest.h"
// Too slow for debug build
#if !SANITIZER_DEBUG
#if SANITIZER_WINDOWS
#define WIN32_LEAN_AND_MEAN
#include <windows.h>
namespace {
typedef int (*IdentityFunction)(int);
#if !SANITIZER_WINDOWS64
const u8 kIdentityCodeWithPrologue[] = {
0x55, // push ebp
0x8B, 0xEC, // mov ebp,esp
0x8B, 0x45, 0x08, // mov eax,dword ptr [ebp + 8]
0x5D, // pop ebp
0xC3, // ret
};
const u8 kIdentityCodeWithPushPop[] = {
0x55, // push ebp
0x8B, 0xEC, // mov ebp,esp
0x53, // push ebx
0x50, // push eax
0x58, // pop eax
0x8B, 0x45, 0x08, // mov eax,dword ptr [ebp + 8]
0x5B, // pop ebx
0x5D, // pop ebp
0xC3, // ret
};
const u8 kPatchableCode1[] = {
0xB8, 0x4B, 0x00, 0x00, 0x00, // mov eax,4B
0x33, 0xC9, // xor ecx,ecx
0xC3, // ret
};
const u8 kPatchableCode2[] = {
0x55, // push ebp
0x8B, 0xEC, // mov ebp,esp
0x33, 0xC0, // xor eax,eax
0x5D, // pop ebp
0xC3, // ret
};
const u8 kPatchableCode3[] = {
0x55, // push ebp
0x8B, 0xEC, // mov ebp,esp
0x6A, 0x00, // push 0
0xE8, 0x3D, 0xFF, 0xFF, 0xFF, // call <func>
};
const u8 kUnpatchableCode1[] = {
0xC3, // ret
};
const u8 kUnpatchableCode2[] = {
0x33, 0xC9, // xor ecx,ecx
0xC3, // ret
};
const u8 kUnpatchableCode3[] = {
0x75, 0xCC, // jne <label>
0x33, 0xC9, // xor ecx,ecx
0xC3, // ret
};
const u8 kUnpatchableCode4[] = {
0x74, 0xCC, // jne <label>
0x33, 0xC9, // xor ecx,ecx
0xC3, // ret
};
const u8 kUnpatchableCode5[] = {
0xEB, 0x02, // jmp <label>
0x33, 0xC9, // xor ecx,ecx
0xC3, // ret
};
const u8 kUnpatchableCode6[] = {
0xE9, 0xCC, 0xCC, 0xCC, 0xCC, // jmp <label>
0x90, 0x90, 0x90, 0x90,
};
const u8 kUnpatchableCode7[] = {
0xE8, 0xCC, 0xCC, 0xCC, 0xCC, // call <func>
0x90, 0x90, 0x90, 0x90,
};
#endif
// A buffer holding the dynamically generated code under test.
u8* ActiveCode;
size_t ActiveCodeLength = 4096;
template<class T>
void LoadActiveCode(const T &Code, uptr *EntryPoint) {
if (ActiveCode == nullptr) {
ActiveCode =
(u8*)::VirtualAlloc(nullptr, ActiveCodeLength, MEM_COMMIT | MEM_RESERVE,
PAGE_EXECUTE_READWRITE);
ASSERT_NE(ActiveCode, nullptr);
}
size_t Position = 0;
*EntryPoint = (uptr)&ActiveCode[0];
// Copy the function body.
for (size_t i = 0; i < sizeof(T); ++i)
ActiveCode[Position++] = Code[i];
}
int InterceptorFunctionCalled;
NOINLINE int InterceptorFunction(int x) {
++InterceptorFunctionCalled;
return x;
}
} // namespace
namespace __interception {
// Tests for interception_win.h
TEST(Interception, InternalGetProcAddress) {
HMODULE ntdll_handle = ::GetModuleHandle("ntdll");
ASSERT_NE(nullptr, ntdll_handle);
uptr DbgPrint_expected = (uptr)::GetProcAddress(ntdll_handle, "DbgPrint");
uptr isdigit_expected = (uptr)::GetProcAddress(ntdll_handle, "isdigit");
uptr DbgPrint_adddress = InternalGetProcAddress(ntdll_handle, "DbgPrint");
uptr isdigit_address = InternalGetProcAddress(ntdll_handle, "isdigit");
EXPECT_EQ(DbgPrint_expected, DbgPrint_adddress);
EXPECT_EQ(isdigit_expected, isdigit_address);
EXPECT_NE(DbgPrint_adddress, isdigit_address);
}
template<class T>
bool TestFunctionPatching(const T &Code) {
uptr Address;
int x = sizeof(T);
LoadActiveCode<T>(Code, &Address);
uptr UnusedRealAddress = 0;
return OverrideFunction(Address, (uptr)&InterceptorFunction,
&UnusedRealAddress);
}
template<class T>
void TestIdentityFunctionPatching(const T &IdentityCode) {
uptr IdentityAddress;
LoadActiveCode<T>(IdentityCode, &IdentityAddress);
IdentityFunction Identity = (IdentityFunction)IdentityAddress;
// Validate behavior before dynamic patching.
InterceptorFunctionCalled = 0;
EXPECT_EQ(0, Identity(0));
EXPECT_EQ(42, Identity(42));
EXPECT_EQ(0, InterceptorFunctionCalled);
// Patch the function.
uptr RealIdentityAddress = 0;
EXPECT_TRUE(OverrideFunction(IdentityAddress, (uptr)&InterceptorFunction,
&RealIdentityAddress));
IdentityFunction RealIdentity = (IdentityFunction)RealIdentityAddress;
// Calling the redirected function.
InterceptorFunctionCalled = 0;
EXPECT_EQ(0, Identity(0));
EXPECT_EQ(42, Identity(42));
EXPECT_EQ(2, InterceptorFunctionCalled);
// Calling the real function.
InterceptorFunctionCalled = 0;
EXPECT_EQ(0, RealIdentity(0));
EXPECT_EQ(42, RealIdentity(42));
EXPECT_EQ(0, InterceptorFunctionCalled);
}
#if !SANITIZER_WINDOWS64
TEST(Interception, OverrideFunction) {
TestIdentityFunctionPatching(kIdentityCodeWithPrologue);
TestIdentityFunctionPatching(kIdentityCodeWithPushPop);
}
TEST(Interception, PatchableFunction) {
EXPECT_TRUE(TestFunctionPatching(kPatchableCode1));
EXPECT_TRUE(TestFunctionPatching(kPatchableCode2));
EXPECT_TRUE(TestFunctionPatching(kPatchableCode3));
EXPECT_FALSE(TestFunctionPatching(kUnpatchableCode1));
EXPECT_FALSE(TestFunctionPatching(kUnpatchableCode2));
EXPECT_FALSE(TestFunctionPatching(kUnpatchableCode3));
EXPECT_FALSE(TestFunctionPatching(kUnpatchableCode4));
EXPECT_FALSE(TestFunctionPatching(kUnpatchableCode5));
EXPECT_FALSE(TestFunctionPatching(kUnpatchableCode6));
EXPECT_FALSE(TestFunctionPatching(kUnpatchableCode7));
}
#endif
} // namespace __interception
#endif // SANITIZER_WINDOWS
#endif // #if !SANITIZER_DEBUG
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