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#include <string.h>
#include "common.h"
#include "tizenasanenv.h"
template <typename Type, int STACK_SIZE>
class StaticStack {
// We don't create constructor because
// this class is used in a zeroed memory area
public:
void push(Type addr)
{
_ASSERTE(m_pos < STACK_SIZE);
m_data[m_pos++] = addr;
}
void pop()
{
_ASSERTE(m_pos > 0);
--m_pos;
}
Type top()
{
_ASSERTE(m_pos > 0);
return m_data[m_pos - 1];
}
bool empty()
{
return m_pos == 0;
}
private:
int m_pos;
Type m_data[STACK_SIZE];
};
#include <pshpack1.h>
struct AuxiliaryCalls {
LPVOID target;
void (*pushAddr)(LPVOID addr);
LPVOID (*popAddr)();
};
struct ReturnInfo {
LPVOID addr;
bool isSanitized;
};
extern "C" void __sanitizer_disable_interceptors();
extern "C" void __sanitizer_enable_interceptors();
extern "C" bool __sanitizer_interceptors_are_enabled();
extern LPVOID tizenASanWrapper;
extern UINT32 tizenASanWrapperSize;
extern UINT32 tizenASanWrapperEntryOffset;
// The maximum nesting of transitions between managed and unmanaged code that we support.
// This number is estimated from the common sense. We think this is enough to check any
// sane code (if it is not recursive) and it won't bloat TLS. We do not use dynamic
// allocation because it complicates the process of memory management in TLS variables.
// It is used only for firmware with ASan and will not affect the release version.
#define MAX_STACK_DEPTH 128
static __thread StaticStack<ReturnInfo, MAX_STACK_DEPTH> s_retInfoStack;
static void DoEnable()
{
_ASSERTE(__sanitizer_interceptors_are_enabled() == false);
__sanitizer_enable_interceptors();
}
static void DoDisable()
{
_ASSERTE(__sanitizer_interceptors_are_enabled() == true);
__sanitizer_disable_interceptors();
}
static void PushAndEnableASan(LPVOID addr)
{
_ASSERTE(__sanitizer_interceptors_are_enabled() == false);
ReturnInfo retInfo = {
.addr = addr,
.isSanitized = false,
};
s_retInfoStack.push(retInfo);
DoEnable();
}
static LPVOID PopAndDisableASan()
{
_ASSERTE(__sanitizer_interceptors_are_enabled() == true);
ReturnInfo retInfo = s_retInfoStack.top();
s_retInfoStack.pop();
_ASSERTE(retInfo.isSanitized == false);
DoDisable();
return retInfo.addr;
}
static void PushAndMayBeDisableASan(LPVOID addr)
{
ReturnInfo retInfo = {
.addr = addr,
.isSanitized = __sanitizer_interceptors_are_enabled(),
};
if (retInfo.isSanitized)
DoDisable();
s_retInfoStack.push(retInfo);
}
static LPVOID PopAndMayBeEnableASan()
{
_ASSERTE(__sanitizer_interceptors_are_enabled() == false);
ReturnInfo retInfo = s_retInfoStack.top();
s_retInfoStack.pop();
if (retInfo.isSanitized)
DoEnable();
return retInfo.addr;
}
static LPVOID CreateWrapper(LPVOID target, void (*pushAddr)(LPVOID addr), LPVOID (*popAddr)())
{
_ASSERTE(tizenASanWrapperEntryOffset == sizeof(AuxiliaryCalls));
LPVOID wrapperSpace = (LPVOID)SystemDomain::GetGlobalLoaderAllocator()->GetExecutableHeap()->AllocMem(S_SIZE_T(tizenASanWrapperSize));
AuxiliaryCalls calls = {
.target = target,
.pushAddr = pushAddr,
.popAddr = popAddr,
};
// copy auxiliary calls
memcpy(wrapperSpace, &calls, sizeof(calls));
LPVOID entryPointer = (LPVOID)((UINT_PTR)wrapperSpace + tizenASanWrapperEntryOffset);
LPVOID wrapperEntryPointer = (LPVOID)((UINT_PTR)&tizenASanWrapper + tizenASanWrapperEntryOffset);
UINT32 wrapperCodeSize = tizenASanWrapperSize - tizenASanWrapperEntryOffset;
// copy executable code wrapper
memcpy(entryPointer, wrapperEntryPointer, wrapperCodeSize);
FlushInstructionCache(GetCurrentProcess(), wrapperSpace, tizenASanWrapperSize);
return entryPointer;
}
namespace TizenASanEnv {
LPVOID CreateWrapperSanitizedEntryPoint(LPVOID target)
{
return CreateWrapper(target, PushAndEnableASan, PopAndDisableASan);
}
LPVOID CreateWrapperILCode(LPVOID target)
{
return CreateWrapper(target, PushAndMayBeDisableASan, PopAndMayBeEnableASan);
}
} // namespace TizenASanEnv
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