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/* $Id: stacksup-vcc.cpp $ */
/** @file
* IPRT - Visual C++ Compiler - Stack Checking C/C++ Support.
*/
/*
* Copyright (C) 2006-2023 Oracle and/or its affiliates.
*
* This file is part of VirtualBox base platform packages, as
* available from https://www.virtualbox.org.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation, in version 3 of the
* License.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, see <https://www.gnu.org/licenses>.
*
* The contents of this file may alternatively be used under the terms
* of the Common Development and Distribution License Version 1.0
* (CDDL), a copy of it is provided in the "COPYING.CDDL" file included
* in the VirtualBox distribution, in which case the provisions of the
* CDDL are applicable instead of those of the GPL.
*
* You may elect to license modified versions of this file under the
* terms and conditions of either the GPL or the CDDL or both.
*
* SPDX-License-Identifier: GPL-3.0-only OR CDDL-1.0
*/
/*********************************************************************************************************************************
* Header Files *
*********************************************************************************************************************************/
#include "internal/nocrt.h"
#include <iprt/asm.h>
#include <iprt/asm-amd64-x86.h>
#ifndef IPRT_NOCRT_WITHOUT_FATAL_WRITE
# include <iprt/assert.h>
#endif
#include "internal/compiler-vcc.h"
#ifdef IN_RING3
# include <iprt/win/windows.h>
# include "../../../r3/win/internal-r3-win.h" /* ugly, but need some windows API function pointers */
#endif
/*********************************************************************************************************************************
* Defined Constants And Macros *
*********************************************************************************************************************************/
/** Gets the program counter member of Windows' CONTEXT structure. */
#if defined(RT_ARCH_AMD64)
# define MY_GET_PC_FROM_CONTEXT(a_pCtx) ((a_pCtx)->Rip)
#elif defined(RT_ARCH_X86)
# define MY_GET_PC_FROM_CONTEXT(a_pCtx) ((a_pCtx)->Eip)
#else
# error "Port Me!"
#endif
/*********************************************************************************************************************************
* Structures and Typedefs *
*********************************************************************************************************************************/
/** Variable descriptor. */
typedef struct RTC_VAR_DESC_T
{
int32_t offFrame;
uint32_t cbVar;
const char *pszName;
} RTC_VAR_DESC_T;
/** Frame descriptor. */
typedef struct RTC_FRAME_DESC_T
{
uint32_t cVars;
RTC_VAR_DESC_T const *paVars;
} RTC_FRAME_DESC_T;
#define VARIABLE_MARKER_PRE 0xcccccccc
#define VARIABLE_MARKER_POST 0xcccccccc
/**
* Alloca allocation entry.
* @note For whatever reason the pNext and cb members are misaligned on 64-bit
* targets. 32-bit targets OTOH adds padding to keep the structure size
* and pNext + cb offsets the same.
*/
#pragma pack(4)
typedef struct RTC_ALLOC_ENTRY
{
uint32_t uGuard1;
RTC_ALLOC_ENTRY *pNext;
#if ARCH_BITS == 32
uint32_t pNextPad;
#endif
size_t cb;
#if ARCH_BITS == 32
uint32_t cbPad;
#endif
uint32_t auGuard2[3];
} RTC_ALLOC_ENTRY;
#pragma pack()
#define ALLOCA_FILLER_BYTE 0xcc
#define ALLOCA_FILLER_32 0xcccccccc
/*********************************************************************************************************************************
* External Symbols *
*********************************************************************************************************************************/
extern "C" void __fastcall _RTC_CheckStackVars(uint8_t *pbFrame, RTC_VAR_DESC_T const *pVar); /* nocrt-stack.asm */
extern "C" uintptr_t __security_cookie;
/**
* Initializes the security cookie value.
*
* This must be called as the first thing by the startup code. We must also no
* do anything fancy here.
*/
void rtVccInitSecurityCookie(void) RT_NOEXCEPT
{
__security_cookie = (uintptr_t)ASMReadTSC() ^ (uintptr_t)&__security_cookie;
}
/**
* Reports a security error.
*
* @param uFastFailCode The fast fail code.
* @param pCpuCtx The CPU context at the failure location.
*/
static DECL_NO_RETURN(void) rtVccFatalSecurityErrorWithCtx(uint32_t uFastFailCode, PCONTEXT pCpuCtx)
{
#ifdef IN_RING3
/*
* Use the __fastfail() approach if available, it is more secure than the stuff below:
*/
if (g_pfnIsProcessorFeaturePresent && g_pfnIsProcessorFeaturePresent(PF_FASTFAIL_AVAILABLE))
__fastfail(uFastFailCode);
/*
* Fallback for legacy systems.
*/
if (g_pfnIsDebuggerPresent && g_pfnIsDebuggerPresent())
__debugbreak();
/* If we can, clear the unhandled exception filter and report and unhandled exception. */
if (g_pfnSetUnhandledExceptionFilter && g_pfnUnhandledExceptionFilter)
{
g_pfnSetUnhandledExceptionFilter(NULL);
EXCEPTION_RECORD XcptRec =
{
/* .ExceptionCode = */ STATUS_STACK_BUFFER_OVERRUN,
/* .ExceptionFlags = */ EXCEPTION_NONCONTINUABLE,
/* .ExceptionRecord = */ NULL,
# ifdef RT_ARCH_AMD64
/* .ExceptionAddress = */ (void *)pCpuCtx->Rip,
# elif defined(RT_ARCH_X86)
/* .ExceptionAddress = */ (void *)pCpuCtx->Eip,
# else
# error "Port me!"
# endif
/* .NumberParameters = */ 1,
/* .ExceptionInformation = */ { uFastFailCode, }
};
EXCEPTION_POINTERS XcptPtrs = { &XcptRec, pCpuCtx };
g_pfnUnhandledExceptionFilter(&XcptPtrs);
}
for (;;)
TerminateProcess(GetCurrentProcess(), STATUS_STACK_BUFFER_OVERRUN);
#else
# error "Port ME!"
#endif
}
DECLASM(void) rtVccStackVarCorrupted(uint8_t *pbFrame, RTC_VAR_DESC_T const *pVar, PCONTEXT pCpuCtx)
{
#ifdef IPRT_NOCRT_WITHOUT_FATAL_WRITE
RTAssertMsg2("\n\n!!Stack corruption!!\n\n"
"%p LB %#x - %s\n",
pbFrame + pVar->offFrame, pVar->cbVar, pVar->pszName);
#else
rtNoCrtFatalWriteBegin(RT_STR_TUPLE("\r\n\r\n!!Stack corruption!!\r\n\r\n"));
rtNoCrtFatalWritePtr(pbFrame + pVar->offFrame);
rtNoCrtFatalWrite(RT_STR_TUPLE(" LB "));
rtNoCrtFatalWriteX32(pVar->cbVar);
rtNoCrtFatalWrite(RT_STR_TUPLE(" - "));
rtNoCrtFatalWriteStr(pVar->pszName);
rtNoCrtFatalWriteEnd(RT_STR_TUPLE("\r\n"));
#endif
rtVccFatalSecurityErrorWithCtx(FAST_FAIL_INCORRECT_STACK, pCpuCtx);
}
DECLASM(void) rtVccSecurityCookieMismatch(uintptr_t uCookie, PCONTEXT pCpuCtx)
{
#ifdef IPRT_NOCRT_WITHOUT_FATAL_WRITE
RTAssertMsg2("\n\n!!Stack cookie corruption!!\n\n"
"expected %p, found %p\n",
__security_cookie, uCookie);
#else
rtNoCrtFatalWriteBegin(RT_STR_TUPLE("\r\n\r\n!!Stack cookie corruption!!\r\n\r\n"
"expected"));
rtNoCrtFatalWritePtr((void *)__security_cookie);
rtNoCrtFatalWrite(RT_STR_TUPLE(", found "));
rtNoCrtFatalWritePtr((void *)uCookie);
rtNoCrtFatalWriteEnd(RT_STR_TUPLE("\r\n"));
#endif
rtVccFatalSecurityErrorWithCtx(FAST_FAIL_STACK_COOKIE_CHECK_FAILURE, pCpuCtx);
}
#ifdef RT_ARCH_X86
DECLASM(void) rtVccCheckEspFailed(PCONTEXT pCpuCtx)
{
# ifdef IPRT_NOCRT_WITHOUT_FATAL_WRITE
RTAssertMsg2("\n\n!!ESP check failed!!\n\n"
"eip=%p esp=%p ebp=%p\n",
pCpuCtx->Eip, pCpuCtx->Esp, pCpuCtx->Ebp);
# else
rtNoCrtFatalWriteBegin(RT_STR_TUPLE("\r\n\r\n!!ESP check failed!!\r\n\r\n"
"eip="));
rtNoCrtFatalWritePtr((void *)pCpuCtx->Eip);
rtNoCrtFatalWrite(RT_STR_TUPLE(" esp="));
rtNoCrtFatalWritePtr((void *)pCpuCtx->Esp);
rtNoCrtFatalWrite(RT_STR_TUPLE(" ebp="));
rtNoCrtFatalWritePtr((void *)pCpuCtx->Ebp);
rtNoCrtFatalWriteEnd(RT_STR_TUPLE("\r\n"));
# endif
rtVccFatalSecurityErrorWithCtx(FAST_FAIL_INCORRECT_STACK, pCpuCtx);
}
#endif
/** @todo reimplement in assembly (feeling too lazy right now). */
extern "C" void __fastcall _RTC_CheckStackVars2(uint8_t *pbFrame, RTC_VAR_DESC_T const *pVar, RTC_ALLOC_ENTRY *pHead)
{
while (pHead)
{
if ( pHead->uGuard1 == ALLOCA_FILLER_32
#if 1 && ARCH_BITS == 32
&& pHead->pNextPad == ALLOCA_FILLER_32
&& pHead->cbPad == ALLOCA_FILLER_32
#endif
&& pHead->auGuard2[0] == ALLOCA_FILLER_32
&& pHead->auGuard2[1] == ALLOCA_FILLER_32
&& pHead->auGuard2[2] == ALLOCA_FILLER_32
&& *(uint32_t const *)((uint8_t const *)pHead + pHead->cb - sizeof(uint32_t)) == ALLOCA_FILLER_32)
{ /* likely */ }
else
{
#ifdef IPRT_NOCRT_WITHOUT_FATAL_WRITE
RTAssertMsg2("\n\n!!Stack corruption (alloca)!!\n\n"
"%p LB %#x\n",
pHead, pHead->cb);
#else
rtNoCrtFatalWriteBegin(RT_STR_TUPLE("\r\n\r\n!!Stack corruption (alloca)!!\r\n\r\n"));
rtNoCrtFatalWritePtr(pHead);
rtNoCrtFatalWrite(RT_STR_TUPLE(" LB "));
rtNoCrtFatalWriteX64(pHead->cb);
rtNoCrtFatalWriteEnd(RT_STR_TUPLE("\r\n"));
#endif
#ifdef IN_RING3
if (g_pfnIsDebuggerPresent && g_pfnIsDebuggerPresent())
#endif
RT_BREAKPOINT();
}
pHead = pHead->pNext;
}
_RTC_CheckStackVars(pbFrame, pVar);
}
DECLASM(void) rtVccRangeCheckFailed(PCONTEXT pCpuCtx)
{
# ifdef IPRT_NOCRT_WITHOUT_FATAL_WRITE
RTAssertMsg2("\n\n!!Range check failed at %p!!\n\n", MY_GET_PC_FROM_CONTEXT(pCpuCtx));
# else
rtNoCrtFatalWriteBegin(RT_STR_TUPLE("\r\n\r\n!!Range check failed at "));
rtNoCrtFatalWritePtr((void *)MY_GET_PC_FROM_CONTEXT(pCpuCtx));
rtNoCrtFatalWriteEnd(RT_STR_TUPLE("!!\r\n"));
# endif
rtVccFatalSecurityErrorWithCtx(FAST_FAIL_RANGE_CHECK_FAILURE, pCpuCtx);
}
/** Whether or not this should be a fatal issue remains to be seen. See
* explanation in stack-vcc.asm. */
#if 0
DECLASM(void) rtVccUninitializedVariableUse(const char *pszVar, PCONTEXT pCpuCtx)
#else
extern "C" void __cdecl _RTC_UninitUse(const char *pszVar)
#endif
{
#ifdef IPRT_NOCRT_WITHOUT_FATAL_WRITE
RTAssertMsg2("\n\n!!Used uninitialized variable %s at %p!!\n\n",
pszVar ? pszVar : "", ASMReturnAddress());
#else
rtNoCrtFatalWriteBegin(RT_STR_TUPLE("\r\n\r\n!!Used uninitialized variable "));
rtNoCrtFatalWriteStr(pszVar);
rtNoCrtFatalWrite(RT_STR_TUPLE(" at "));
rtNoCrtFatalWritePtr(ASMReturnAddress());
rtNoCrtFatalWriteEnd(RT_STR_TUPLE("!!\r\n\r\n"));
#endif
#if 0
rtVccFatalSecurityErrorWithCtx(FAST_FAIL_FATAL_APP_EXIT, pCpuCtx);
#else
# ifdef IN_RING3
if (g_pfnIsDebuggerPresent && g_pfnIsDebuggerPresent())
# endif
RT_BREAKPOINT();
#endif
}
void rtVccCheckContextFailed(PCONTEXT pCpuCtx)
{
#ifdef IPRT_NOCRT_WITHOUT_FATAL_WRITE
RTAssertMsg2("\n\n!!Context (stack) check failed!!\n\n"
"PC=%p SP=%p BP=%p\n",
# ifdef RT_ARCH_AMD64
pCpuCtx->Rip, pCpuCtx->Rsp, pCpuCtx->Rbp
# elif defined(RT_ARCH_X86)
pCpuCtx->Eip, pCpuCtx->Esp, pCpuCtx->Ebp
# else
# error "unsupported arch"
# endif
);
#else
rtNoCrtFatalWriteBegin(RT_STR_TUPLE("\r\n\r\n!!Context (stack) check failed!!\r\n\r\n"
"PC="));
# ifdef RT_ARCH_AMD64
rtNoCrtFatalWritePtr((void *)pCpuCtx->Rip);
# elif defined(RT_ARCH_X86)
rtNoCrtFatalWritePtr((void *)pCpuCtx->Eip);
# else
# error "unsupported arch"
# endif
rtNoCrtFatalWrite(RT_STR_TUPLE(" SP="));
# ifdef RT_ARCH_AMD64
rtNoCrtFatalWritePtr((void *)pCpuCtx->Rsp);
# elif defined(RT_ARCH_X86)
rtNoCrtFatalWritePtr((void *)pCpuCtx->Esp);
# endif
rtNoCrtFatalWrite(RT_STR_TUPLE(" BP="));
# ifdef RT_ARCH_AMD64
rtNoCrtFatalWritePtr((void *)pCpuCtx->Rbp);
# elif defined(RT_ARCH_X86)
rtNoCrtFatalWritePtr((void *)pCpuCtx->Ebp);
# endif
rtNoCrtFatalWriteEnd(RT_STR_TUPLE("\r\n"));
#endif
rtVccFatalSecurityErrorWithCtx(FAST_FAIL_INVALID_SET_OF_CONTEXT, pCpuCtx);
}
|
