cpptmpdyncode/dyncode.cc at master · dholm/cpptmpdyncode · GitHub

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#include<stdio.h>
#include<stdlib.h>
#include<string.h>
#include<stdint.h>
#include<errno.h>

#include<sys/user.h>
#include<sys/mman.h>

#include"conditionals.h"
#include"typelist.h"
#include"bytes.h"

#include"registers.h"
#include"modrm.h"

template <Register reg>
structInc {
typedeftypename Imm<0x40 + reg, 1>::Type Type;
};

template <class_MovRMSIB>
structMovRM32ToR32 {
typedeftypename Splice<Imm<0x8b, 1>::Type, _MovRMSIB>::Type Type;
};

structRet {
typedef Imm<0xc3, 1>::Type Type;
};

typedefint (*Call)(int i);

classAlignedPointer {
public:
AlignedPointer() :
m_pointer(NULL),
m_aligned_pointer(NULL) {
 }

~AlignedPointer() {
 m_aligned_pointer = NULL;
free(m_pointer);
 }

intinit(size_t size, off_t alignment) {
 m_pointer = malloc(size + (alignment - 1));
if (!m_pointer) {
return -ENOMEM;
 }

 m_aligned_pointer = reinterpret_cast<void*>(
 (reinterpret_cast<off_t>(m_pointer) + (alignment - 1)) &
 ~(alignment - 1));

return0;
 }

void* operator()() {
return m_aligned_pointer;
 }

constvoid* operator()() const {
return m_aligned_pointer;
 }

private:
void* m_pointer;
void* m_aligned_pointer;
};

template <typename ...Statements>
structCodeBlock;

template <typename Statement, typename... Tail>
structCodeBlock<Statement, Tail...> {
typedeftypename Splice<
 Statement, typename CodeBlock<Tail...>::Type >::Type Type;
};

template <>
structCodeBlock<> {
typedef NullType Type;
};

intmain(int argc, char** argv) {
typedef CodeBlock<
 MovRM32ToR32<ModRMSIB<EAX, ESP, ESP, SibScale_1, 4>::Type>::Type,
 Inc<EAX>::Type,
 Ret::Type>::Type Fn;

 AlignedPointer inc_mem;
if (inc_mem.init(Length<Fn>::value, PAGE_SIZE) < 0) {
fprintf(stderr, "Unable to allocate memory!\n");
return -1;
 }
 Call inc = reinterpret_cast<Call>(inc_mem());
if (mprotect(
inc_mem(),
 Length<Fn>::value,
PROT_READ | PROT_WRITE | PROT_EXEC) < 0) {
perror("Memory protection failed");
return -1;
 }
 Serialize<Fn>::Do(reinterpret_cast<uint8_t*>(inc));

printf("%d = inc(41)\n", inc(41));

return0;
}