static void
vboxApplyPatch(const char* psFuncName, void *pDst, const void *pSrc, unsigned long size)
{
void *alPatch;
int rv;
/* Get aligned start address we're going to patch*/
alPatch = (void*) ((uintptr_t)pDst & ~(uintptr_t)(PAGESIZE-1));
#ifndef VBOX_NO_MESA_PATCH_REPORTS
crDebug("MProtecting: %p, %li", alPatch, pDst-alPatch+size);
#endif
/* Get write access to mesa functions */
rv = RTMemProtect(alPatch, pDst-alPatch+size, RTMEM_PROT_READ|RTMEM_PROT_WRITE|RTMEM_PROT_EXEC);
if (RT_FAILURE(rv))
{
crError("mprotect failed with %x (%s)", rv, psFuncName);
}
#ifndef VBOX_NO_MESA_PATCH_REPORTS
crDebug("Writing %li bytes to %p from %p", size, pDst, pSrc);
#endif
crMemcpy(pDst, pSrc, size);
/*@todo Restore the protection, probably have to check what was it before us...*/
rv = RTMemProtect(alPatch, pDst-alPatch+size, RTMEM_PROT_READ|RTMEM_PROT_EXEC);
if (RT_FAILURE(rv))
{
crError("mprotect2 failed with %x (%s)", rv, psFuncName);
}
}
/** Generic implementation of krdrRTFileProtect. */
static int krdrRTFileGenericProtect(PKRDR pRdr, PKRDRFILEPREP pPrep, KU32 cSegments, PCKLDRSEG paSegments, KBOOL fUnprotectOrProtect)
{
KU32 i;
/*
* Iterate the segments and apply memory protection changes.
*/
for (i = 0; i < cSegments; i++)
{
int rc;
void *pv;
KPROT enmProt;
if (paSegments[i].RVA == NIL_KLDRADDR)
continue;
/* calc new protection. */
enmProt = (KPROT)paSegments[i].enmProt; /** @todo drop cast */
if (fUnprotectOrProtect)
{
switch (enmProt)
{
case KPROT_NOACCESS:
case KPROT_READONLY:
case KPROT_READWRITE:
case KPROT_WRITECOPY:
enmProt = KPROT_READWRITE;
break;
case KPROT_EXECUTE:
case KPROT_EXECUTE_READ:
case KPROT_EXECUTE_READWRITE:
case KPROT_EXECUTE_WRITECOPY:
enmProt = KPROT_EXECUTE_READWRITE;
break;
default:
AssertFailed();
return -1;
}
}
else
{
/* copy on write -> normal write. */
if (enmProt == KPROT_EXECUTE_WRITECOPY)
enmProt = KPROT_EXECUTE_READWRITE;
else if (enmProt == KPROT_WRITECOPY)
enmProt = KPROT_READWRITE;
}
pv = (KU8 *)pPrep->pv + paSegments[i].RVA;
rc = RTMemProtect(pv, paSegments[i].cbMapped, krdrRTFileConvertProt(enmProt));
if (rc)
break;
}
return 0;
}
/**
* Internal free.
*/
RTDECL(void) rtR3MemFree(const char *pszOp, RTMEMTYPE enmType, void *pv, void *pvCaller, RT_SRC_POS_DECL)
{
/*
* Simple case.
*/
if (!pv)
return;
/*
* Check watch points.
*/
for (unsigned i = 0; i < RT_ELEMENTS(gapvRTMemFreeWatch); i++)
if (gapvRTMemFreeWatch[i] == pv)
RTAssertDoPanic();
#ifdef RTALLOC_EFENCE_TRACE
/*
* Find the block.
*/
PRTMEMBLOCK pBlock = rtmemBlockRemove(pv);
if (pBlock)
{
if (gfRTMemFreeLog)
RTLogPrintf("RTMem %s: pv=%p pvCaller=%p cbUnaligned=%#x\n", pszOp, pv, pvCaller, pBlock->cbUnaligned);
# ifdef RTALLOC_EFENCE_NOMAN_FILLER
/*
* Check whether the no man's land is untouched.
*/
# ifdef RTALLOC_EFENCE_IN_FRONT
void *pvWrong = ASMMemIsAll8((char *)pv + pBlock->cbUnaligned,
RT_ALIGN_Z(pBlock->cbAligned, PAGE_SIZE) - pBlock->cbUnaligned,
RTALLOC_EFENCE_NOMAN_FILLER);
# else
/* Alignment must match allocation alignment in rtMemAlloc(). */
void *pvWrong = ASMMemIsAll8((char *)pv + pBlock->cbUnaligned,
pBlock->cbAligned - pBlock->cbUnaligned,
RTALLOC_EFENCE_NOMAN_FILLER);
if (pvWrong)
RTAssertDoPanic();
pvWrong = ASMMemIsAll8((void *)((uintptr_t)pv & ~PAGE_OFFSET_MASK),
RT_ALIGN_Z(pBlock->cbAligned, PAGE_SIZE) - pBlock->cbAligned,
RTALLOC_EFENCE_NOMAN_FILLER);
# endif
if (pvWrong)
RTAssertDoPanic();
# endif
# ifdef RTALLOC_EFENCE_FREE_FILL
/*
* Fill the user part of the block.
*/
memset(pv, RTALLOC_EFENCE_FREE_FILL, pBlock->cbUnaligned);
# endif
# if defined(RTALLOC_EFENCE_FREE_DELAYED) && RTALLOC_EFENCE_FREE_DELAYED > 0
/*
* We're doing delayed freeing.
* That means we'll expand the E-fence to cover the entire block.
*/
int rc = RTMemProtect(pv, pBlock->cbAligned, RTMEM_PROT_NONE);
if (RT_SUCCESS(rc))
{
/*
* Insert it into the free list and process pending frees.
*/
rtmemBlockDelayInsert(pBlock);
while ((pBlock = rtmemBlockDelayRemove()) != NULL)
{
pv = pBlock->Core.Key;
# ifdef RTALLOC_EFENCE_IN_FRONT
void *pvBlock = (char *)pv - RTALLOC_EFENCE_SIZE;
# else
void *pvBlock = (void *)((uintptr_t)pv & ~PAGE_OFFSET_MASK);
# endif
size_t cbBlock = RT_ALIGN_Z(pBlock->cbAligned, PAGE_SIZE) + RTALLOC_EFENCE_SIZE;
rc = RTMemProtect(pvBlock, cbBlock, RTMEM_PROT_READ | RTMEM_PROT_WRITE);
if (RT_SUCCESS(rc))
RTMemPageFree(pvBlock, RT_ALIGN_Z(pBlock->cbAligned, PAGE_SIZE) + RTALLOC_EFENCE_SIZE);
else
rtmemComplain(pszOp, "RTMemProtect(%p, %#x, RTMEM_PROT_READ | RTMEM_PROT_WRITE) -> %d\n", pvBlock, cbBlock, rc);
rtmemBlockFree(pBlock);
}
}
else
rtmemComplain(pszOp, "Failed to expand the efence of pv=%p cb=%d, rc=%d.\n", pv, pBlock, rc);
# else /* !RTALLOC_EFENCE_FREE_DELAYED */
/*
* Turn of the E-fence and free it.
*/
# ifdef RTALLOC_EFENCE_IN_FRONT
void *pvBlock = (char *)pv - RTALLOC_EFENCE_SIZE;
void *pvEFence = pvBlock;
# else
void *pvBlock = (void *)((uintptr_t)pv & ~PAGE_OFFSET_MASK);
void *pvEFence = (char *)pv + pBlock->cb;
# endif
int rc = RTMemProtect(pvEFence, RTALLOC_EFENCE_SIZE, RTMEM_PROT_READ | RTMEM_PROT_WRITE);
if (RT_SUCCESS(rc))
RTMemPageFree(pvBlock, RT_ALIGN_Z(pBlock->cbAligned, PAGE_SIZE) + RTALLOC_EFENCE_SIZE);
else
rtmemComplain(pszOp, "RTMemProtect(%p, %#x, RTMEM_PROT_READ | RTMEM_PROT_WRITE) -> %d\n", pvEFence, RTALLOC_EFENCE_SIZE, rc);
rtmemBlockFree(pBlock);
# endif /* !RTALLOC_EFENCE_FREE_DELAYED */
}
else
rtmemComplain(pszOp, "pv=%p not found! Incorrect free!\n", pv);
#else /* !RTALLOC_EFENCE_TRACE */
/*
* We have no size tracking, so we're not doing any freeing because
* we cannot if the E-fence is after the block.
* Let's just expand the E-fence to the first page of the user bit
* since we know that it's around.
*/
int rc = RTMemProtect((void *)((uintptr_t)pv & ~PAGE_OFFSET_MASK), PAGE_SIZE, RTMEM_PROT_NONE);
if (RT_FAILURE(rc))
rtmemComplain(pszOp, "RTMemProtect(%p, PAGE_SIZE, RTMEM_PROT_NONE) -> %d\n", (void *)((uintptr_t)pv & ~PAGE_OFFSET_MASK), rc);
#endif /* !RTALLOC_EFENCE_TRACE */
}
/**
* Internal allocator.
*/
RTDECL(void *) rtR3MemAlloc(const char *pszOp, RTMEMTYPE enmType, size_t cbUnaligned, size_t cbAligned,
const char *pszTag, void *pvCaller, RT_SRC_POS_DECL)
{
/*
* Sanity.
*/
if ( RT_ALIGN_Z(RTALLOC_EFENCE_SIZE, PAGE_SIZE) != RTALLOC_EFENCE_SIZE
&& RTALLOC_EFENCE_SIZE <= 0)
{
rtmemComplain(pszOp, "Invalid E-fence size! %#x\n", RTALLOC_EFENCE_SIZE);
return NULL;
}
if (!cbUnaligned)
{
#if 0
rtmemComplain(pszOp, "Request of ZERO bytes allocation!\n");
return NULL;
#else
cbAligned = cbUnaligned = 1;
#endif
}
#ifndef RTALLOC_EFENCE_IN_FRONT
/* Alignment decreases fence accuracy, but this is at least partially
* counteracted by filling and checking the alignment padding. When the
* fence is in front then then no extra alignment is needed. */
cbAligned = RT_ALIGN_Z(cbAligned, RTALLOC_EFENCE_ALIGNMENT);
#endif
#ifdef RTALLOC_EFENCE_TRACE
/*
* Allocate the trace block.
*/
PRTMEMBLOCK pBlock = rtmemBlockCreate(enmType, cbUnaligned, cbAligned, pszTag, pvCaller, RT_SRC_POS_ARGS);
if (!pBlock)
{
rtmemComplain(pszOp, "Failed to allocate trace block!\n");
return NULL;
}
#endif
/*
* Allocate a block with page alignment space + the size of the E-fence.
*/
size_t cbBlock = RT_ALIGN_Z(cbAligned, PAGE_SIZE) + RTALLOC_EFENCE_SIZE;
void *pvBlock = RTMemPageAlloc(cbBlock);
if (pvBlock)
{
/*
* Calc the start of the fence and the user block
* and then change the page protection of the fence.
*/
#ifdef RTALLOC_EFENCE_IN_FRONT
void *pvEFence = pvBlock;
void *pv = (char *)pvEFence + RTALLOC_EFENCE_SIZE;
# ifdef RTALLOC_EFENCE_NOMAN_FILLER
memset((char *)pv + cbUnaligned, RTALLOC_EFENCE_NOMAN_FILLER, cbBlock - RTALLOC_EFENCE_SIZE - cbUnaligned);
# endif
#else
void *pvEFence = (char *)pvBlock + (cbBlock - RTALLOC_EFENCE_SIZE);
void *pv = (char *)pvEFence - cbAligned;
# ifdef RTALLOC_EFENCE_NOMAN_FILLER
memset(pvBlock, RTALLOC_EFENCE_NOMAN_FILLER, cbBlock - RTALLOC_EFENCE_SIZE - cbAligned);
memset((char *)pv + cbUnaligned, RTALLOC_EFENCE_NOMAN_FILLER, cbAligned - cbUnaligned);
# endif
#endif
#ifdef RTALLOC_EFENCE_FENCE_FILLER
memset(pvEFence, RTALLOC_EFENCE_FENCE_FILLER, RTALLOC_EFENCE_SIZE);
#endif
int rc = RTMemProtect(pvEFence, RTALLOC_EFENCE_SIZE, RTMEM_PROT_NONE);
if (!rc)
{
#ifdef RTALLOC_EFENCE_TRACE
rtmemBlockInsert(pBlock, pv);
#endif
if (enmType == RTMEMTYPE_RTMEMALLOCZ)
memset(pv, 0, cbUnaligned);
#ifdef RTALLOC_EFENCE_FILLER
else
memset(pv, RTALLOC_EFENCE_FILLER, cbUnaligned);
#endif
rtmemLog(pszOp, "returns %p (pvBlock=%p cbBlock=%#x pvEFence=%p cbUnaligned=%#x)\n", pv, pvBlock, cbBlock, pvEFence, cbUnaligned);
return pv;
}
rtmemComplain(pszOp, "RTMemProtect failed, pvEFence=%p size %d, rc=%d\n", pvEFence, RTALLOC_EFENCE_SIZE, rc);
RTMemPageFree(pvBlock, cbBlock);
}
else
rtmemComplain(pszOp, "Failed to allocated %lu (%lu) bytes.\n", (unsigned long)cbBlock, (unsigned long)cbUnaligned);
#ifdef RTALLOC_EFENCE_TRACE
rtmemBlockFree(pBlock);
#endif
return NULL;
}
static void rtMemReplaceMallocAndFriends(void)
{
struct
{
const char *pszName;
PFNRT pfnReplacement;
PFNRT pfnOrg;
PFNRT *ppfnJumpBack;
} aApis[] =
{
{ "free", (PFNRT)rtMemReplacementFree, (PFNRT)free, (PFNRT *)&g_pfnOrgFree },
{ "realloc", (PFNRT)rtMemReplacementRealloc, (PFNRT)realloc, (PFNRT *)&g_pfnOrgRealloc },
{ "calloc", (PFNRT)rtMemReplacementCalloc, (PFNRT)calloc, (PFNRT *)&g_pfnOrgCalloc },
{ "malloc", (PFNRT)rtMemReplacementMalloc, (PFNRT)malloc, (PFNRT *)&g_pfnOrgMalloc },
#ifdef RT_OS_DARWIN
{ "malloc_size", (PFNRT)rtMemReplacementMallocSize, (PFNRT)malloc_size, (PFNRT *)&g_pfnOrgMallocSize },
#endif
};
/*
* Initialize the jump backs to avoid recursivly entering this function.
*/
for (unsigned i = 0; i < RT_ELEMENTS(aApis); i++)
*aApis[i].ppfnJumpBack = aApis[i].pfnOrg;
/*
* Give the user an option to skip replacing malloc.
*/
if (getenv("IPRT_DONT_REPLACE_MALLOC"))
return;
/*
* Allocate a page for jump back code (we leak it).
*/
uint8_t *pbExecPage = (uint8_t *)RTMemPageAlloc(PAGE_SIZE); AssertFatal(pbExecPage);
int rc = RTMemProtect(pbExecPage, PAGE_SIZE, RTMEM_PROT_READ | RTMEM_PROT_WRITE | RTMEM_PROT_EXEC); AssertFatalRC(rc);
/*
* Do the ground work.
*/
uint8_t *pb = pbExecPage;
for (unsigned i = 0; i < RT_ELEMENTS(aApis); i++)
{
/* Resolve it. */
PFNRT pfnOrg = (PFNRT)(uintptr_t)dlsym(RTLD_DEFAULT, aApis[i].pszName);
if (pfnOrg)
aApis[i].pfnOrg = pfnOrg;
else
pfnOrg = aApis[i].pfnOrg;
/* Figure what we can replace and how much to duplicate in the jump back code. */
# ifdef RT_ARCH_AMD64
uint32_t cbNeeded = 12;
DISCPUMODE const enmCpuMode = DISCPUMODE_64BIT;
# elif defined(RT_ARCH_X86)
uint32_t const cbNeeded = 5;
DISCPUMODE const enmCpuMode = DISCPUMODE_32BIT;
# else
# error "Port me"
# endif
uint32_t offJmpBack = 0;
uint32_t cbCopy = 0;
while (offJmpBack < cbNeeded)
{
DISCPUSTATE Dis;
uint32_t cbInstr = 1;
rc = DISInstr((void *)((uintptr_t)pfnOrg + offJmpBack), enmCpuMode, &Dis, &cbInstr); AssertFatalRC(rc);
AssertFatal(!(Dis.pCurInstr->fOpType & (DISOPTYPE_CONTROLFLOW)));
# ifdef RT_ARCH_AMD64
# ifdef RT_OS_DARWIN
/* Kludge for: cmp [malloc_def_zone_state], 1; jg 2; call _malloc_initialize; 2: */
DISQPVPARAMVAL Parm;
if ( Dis.ModRM.Bits.Mod == 0
&& Dis.ModRM.Bits.Rm == 5 /* wrt RIP */
&& (Dis.Param2.fUse & (DISUSE_IMMEDIATE16_SX8 | DISUSE_IMMEDIATE32_SX8 | DISUSE_IMMEDIATE64_SX8))
&& Dis.Param2.uValue == 1
&& Dis.pCurInstr->uOpcode == OP_CMP)
{
cbCopy = offJmpBack;
offJmpBack += cbInstr;
rc = DISInstr((void *)((uintptr_t)pfnOrg + offJmpBack), enmCpuMode, &Dis, &cbInstr); AssertFatalRC(rc);
if ( Dis.pCurInstr->uOpcode == OP_JNBE
&& Dis.Param1.uDisp.i8 == 5)
{
offJmpBack += cbInstr + 5;
AssertFatal(offJmpBack >= cbNeeded);
break;
}
}
# endif
AssertFatal(!(Dis.ModRM.Bits.Mod == 0 && Dis.ModRM.Bits.Rm == 5 /* wrt RIP */));
# endif
offJmpBack += cbInstr;
}
if (!cbCopy)
cbCopy = offJmpBack;
/* Assemble the jump back. */
memcpy(pb, (void *)(uintptr_t)pfnOrg, cbCopy);
uint32_t off = cbCopy;
# ifdef RT_ARCH_AMD64
pb[off++] = 0xff; /* jmp qword [$+8 wrt RIP] */
pb[off++] = 0x25;
*(uint32_t *)&pb[off] = 0;
off += 4;
*(uint64_t *)&pb[off] = (uintptr_t)pfnOrg + offJmpBack;
off += 8;
off = RT_ALIGN_32(off, 16);
# elif defined(RT_ARCH_X86)
pb[off++] = 0xe9; /* jmp rel32 */
*(uint32_t *)&pb[off] = (uintptr_t)pfnOrg + offJmpBack - (uintptr_t)&pb[4];
off += 4;
off = RT_ALIGN_32(off, 8);
# else
# error "Port me"
# endif
*aApis[i].ppfnJumpBack = (PFNRT)(uintptr_t)pb;
pb += off;
}
/*
* Modify the APIs.
*/
for (unsigned i = 0; i < RT_ELEMENTS(aApis); i++)
{
pb = (uint8_t *)(uintptr_t)aApis[i].pfnOrg;
rc = RTMemProtect(pb, 16, RTMEM_PROT_READ | RTMEM_PROT_WRITE | RTMEM_PROT_EXEC); AssertFatalRC(rc);
# ifdef RT_ARCH_AMD64
/* Assemble the LdrLoadDll patch. */
*pb++ = 0x48; /* mov rax, qword */
*pb++ = 0xb8;
*(uint64_t *)pb = (uintptr_t)aApis[i].pfnReplacement;
pb += 8;
*pb++ = 0xff; /* jmp rax */
*pb++ = 0xe0;
# elif defined(RT_ARCH_X86)
*pb++ = 0xe9; /* jmp rel32 */
*(uint32_t *)pb = (uintptr_t)aApis[i].pfnReplacement - (uintptr_t)&pb[4];
# else
# error "Port me"
# endif
}
}
int main()
{
/*
* Set up the test environment.
*/
RTTEST hTest;
RTEXITCODE rcExit = RTTestInitAndCreate("tstX86-1", &hTest);
if (rcExit != RTEXITCODE_SUCCESS)
return rcExit;
RTTestBanner(hTest);
g_pbEfPage = (uint8_t *)RTTestGuardedAllocTail(hTest, PAGE_SIZE);
RTTESTI_CHECK(g_pbEfPage != NULL);
g_pbEfExecPage = (uint8_t *)RTMemExecAlloc(PAGE_SIZE*2);
RTTESTI_CHECK(g_pbEfExecPage != NULL);
RTTESTI_CHECK(!((uintptr_t)g_pbEfExecPage & PAGE_OFFSET_MASK));
RTTESTI_CHECK_RC(RTMemProtect(g_pbEfExecPage + PAGE_SIZE, PAGE_SIZE, RTMEM_PROT_NONE), VINF_SUCCESS);
#ifdef USE_SIGNAL
static int const s_aiSigs[] = { SIGBUS, SIGSEGV, SIGFPE, SIGILL };
for (unsigned i = 0; i < RT_ELEMENTS(s_aiSigs); i++)
{
struct sigaction SigAct;
RTTESTI_CHECK_BREAK(sigaction(s_aiSigs[i], NULL, &SigAct) == 0);
SigAct.sa_sigaction = sigHandler;
SigAct.sa_flags |= SA_SIGINFO;
RTTESTI_CHECK(sigaction(s_aiSigs[i], &SigAct, NULL) == 0);
}
#else
/** @todo implement me. */
#endif
if (!RTTestErrorCount(hTest))
{
/*
* Do the testing.
*/
int32_t rc;
#if 0
RTTestSub(hTest, "Misc 1");
rc = x861_Test1();
if (rc != 0)
RTTestFailed(hTest, "x861_Test1 -> %d", rc);
RTTestSub(hTest, "Prefixes and groups");
rc = x861_Test2();
if (rc != 0)
RTTestFailed(hTest, "x861_Test2 -> %d", rc);
RTTestSub(hTest, "fxsave / fxrstor and #PFs");
rc = x861_Test3();
if (rc != 0)
RTTestFailed(hTest, "x861_Test3 -> %d", rc);
RTTestSub(hTest, "Multibyte NOPs");
rc = x861_Test4();
if (rc != 0)
RTTestFailed(hTest, "x861_Test4 -> %d", rc);
//#endif
RTTestSub(hTest, "Odd encodings and odd ends");
rc = x861_Test5();
if (rc != 0)
RTTestFailed(hTest, "x861_Test5 -> %d", rc);
//#if 0
RTTestSub(hTest, "Odd floating point encodings");
rc = x861_Test6();
if (rc != 0)
RTTestFailed(hTest, "x861_Test5 -> %d", rc);
RTTestSub(hTest, "Floating point exceptions ++");
rc = x861_Test7();
if (rc != 0)
RTTestFailed(hTest, "x861_Test6 -> %d", rc);
#endif
rc = x861_TestFPUInstr1();
if (rc != 0)
RTTestFailed(hTest, "x861_TestFPUInstr1 -> %d", rc);
}
return RTTestSummaryAndDestroy(hTest);
}