1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
|
From 90fd3a315a5300c4c72086e541d35a73694e176b Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=EC=9D=B4=EC=B6=98=EC=84=9D/Developer=20Experience=20Lab?=
=?UTF-8?q?=28S/W=EC=84=BC=ED=84=B0=29/Senior=20Engineer/=EC=82=BC?=
=?UTF-8?q?=EC=84=B1=EC=A0=84=EC=9E=90?= <chunseok.lee@samsung.com>
Date: Thu, 24 Aug 2017 07:27:23 +0900
Subject: [PATCH 10/23] Use 'udf 0xff' instead of 'bkpt 0xbe' as a poison (#13)
* Fill freed loader heap chunk with non-zero value (#12731)
* Add FEATURE_LOADER_HEAP_GUARD feature
* Invoke memset only for reclaimed regions
* Enable FEATURE_LOADER_HEAP_GUARD by default
* Insert trap inside UMEntryThunk::Terminate
* Make all exectuable heaps not to zero-initialize itself
Use fZeroInit (instead of fMakeRelazed)
* Add comment
* Revert unnecessary changes
* Add and use 'Poison' method to insert a trap
* Do NOT invoke FlushInstructionCache
* Update comment
* Add comment on ARM Poisoning instruction
* Use X86_INSTR_INT3 instead of 0xCC
* Use 'udf 0xff' instead of 'bkpt 0xbe' as a poison (#13152)
---
src/inc/loaderheap.h | 23 +++++++++++++----------
src/utilcode/loaderheap.cpp | 35 ++++++++++++++++++++++++++---------
src/vm/amd64/cgenamd64.cpp | 13 +++++++++++++
src/vm/amd64/cgencpu.h | 1 +
src/vm/arm/cgencpu.h | 1 +
src/vm/arm/stubs.cpp | 6 ++++++
src/vm/arm64/cgencpu.h | 1 +
src/vm/arm64/stubs.cpp | 4 ++++
src/vm/dllimportcallback.cpp | 12 +++---------
src/vm/dllimportcallback.h | 4 ----
src/vm/i386/cgencpu.h | 1 +
src/vm/i386/cgenx86.cpp | 7 +++++++
src/vm/loaderallocator.cpp | 4 +++-
13 files changed, 79 insertions(+), 33 deletions(-)
diff --git a/src/inc/loaderheap.h b/src/inc/loaderheap.h
index 7d4c48f..4333505 100644
--- a/src/inc/loaderheap.h
+++ b/src/inc/loaderheap.h
@@ -217,7 +217,7 @@ private:
size_t * m_pPrivatePerfCounter_LoaderBytes;
- DWORD m_flProtect;
+ DWORD m_Options;
LoaderHeapFreeBlock *m_pFirstFreeBlock;
@@ -288,7 +288,8 @@ protected:
SIZE_T dwReservedRegionSize,
size_t *pPrivatePerfCounter_LoaderBytes = NULL,
RangeList *pRangeList = NULL,
- BOOL fMakeExecutable = FALSE);
+ BOOL fMakeExecutable = FALSE,
+ BOOL fZeroInit = TRUE);
~UnlockedLoaderHeap();
#endif
@@ -398,10 +399,8 @@ public:
return m_dwTotalAlloc;
}
- BOOL IsExecutable()
- {
- return (PAGE_EXECUTE_READWRITE == m_flProtect);
- }
+ BOOL IsExecutable();
+ BOOL IsZeroInit();
public:
@@ -447,14 +446,16 @@ public:
DWORD dwCommitBlockSize,
size_t *pPrivatePerfCounter_LoaderBytes = NULL,
RangeList *pRangeList = NULL,
- BOOL fMakeExecutable = FALSE
+ BOOL fMakeExecutable = FALSE,
+ BOOL fZeroInit = TRUE
)
: UnlockedLoaderHeap(dwReserveBlockSize,
dwCommitBlockSize,
NULL, 0,
pPrivatePerfCounter_LoaderBytes,
pRangeList,
- fMakeExecutable)
+ fMakeExecutable,
+ fZeroInit)
{
WRAPPER_NO_CONTRACT;
m_CriticalSection = NULL;
@@ -469,7 +470,8 @@ public:
SIZE_T dwReservedRegionSize,
size_t *pPrivatePerfCounter_LoaderBytes = NULL,
RangeList *pRangeList = NULL,
- BOOL fMakeExecutable = FALSE
+ BOOL fMakeExecutable = FALSE,
+ BOOL fZeroInit = TRUE
)
: UnlockedLoaderHeap(dwReserveBlockSize,
dwCommitBlockSize,
@@ -477,7 +479,8 @@ public:
dwReservedRegionSize,
pPrivatePerfCounter_LoaderBytes,
pRangeList,
- fMakeExecutable)
+ fMakeExecutable,
+ fZeroInit)
{
WRAPPER_NO_CONTRACT;
m_CriticalSection = NULL;
diff --git a/src/utilcode/loaderheap.cpp b/src/utilcode/loaderheap.cpp
index a005ac8..21aa150 100644
--- a/src/utilcode/loaderheap.cpp
+++ b/src/utilcode/loaderheap.cpp
@@ -10,6 +10,9 @@
#define DONOT_DEFINE_ETW_CALLBACK
#include "eventtracebase.h"
+#define LHF_EXECUTABLE 0x1
+#define LHF_ZEROINIT 0x2
+
#ifndef DACCESS_COMPILE
INDEBUG(DWORD UnlockedLoaderHeap::s_dwNumInstancesOfLoaderHeaps = 0;)
@@ -903,7 +906,8 @@ UnlockedLoaderHeap::UnlockedLoaderHeap(DWORD dwReserveBlockSize,
SIZE_T dwReservedRegionSize,
size_t *pPrivatePerfCounter_LoaderBytes,
RangeList *pRangeList,
- BOOL fMakeExecutable)
+ BOOL fMakeExecutable,
+ BOOL fZeroInit)
{
CONTRACTL
{
@@ -939,10 +943,11 @@ UnlockedLoaderHeap::UnlockedLoaderHeap(DWORD dwReserveBlockSize,
m_pPrivatePerfCounter_LoaderBytes = pPrivatePerfCounter_LoaderBytes;
+ m_Options = 0;
if (fMakeExecutable)
- m_flProtect = PAGE_EXECUTE_READWRITE;
- else
- m_flProtect = PAGE_READWRITE;
+ m_Options |= LHF_EXECUTABLE;
+ if (fZeroInit)
+ m_Options |= LHF_ZEROINIT;
m_pFirstFreeBlock = NULL;
@@ -1133,7 +1138,7 @@ BOOL UnlockedLoaderHeap::UnlockedReservePages(size_t dwSizeToCommit)
}
// Commit first set of pages, since it will contain the LoaderHeapBlock
- void *pTemp = ClrVirtualAlloc(pData, dwSizeToCommit, MEM_COMMIT, m_flProtect);
+ void *pTemp = ClrVirtualAlloc(pData, dwSizeToCommit, MEM_COMMIT, (m_Options & LHF_EXECUTABLE) ? PAGE_EXECUTE_READWRITE : PAGE_READWRITE);
if (pTemp == NULL)
{
//_ASSERTE(!"Unable to ClrVirtualAlloc commit in a loaderheap");
@@ -1225,7 +1230,7 @@ BOOL UnlockedLoaderHeap::GetMoreCommittedPages(size_t dwMinSize)
dwSizeToCommit = ALIGN_UP(dwSizeToCommit, PAGE_SIZE);
// Yes, so commit the desired number of reserved pages
- void *pData = ClrVirtualAlloc(m_pPtrToEndOfCommittedRegion, dwSizeToCommit, MEM_COMMIT, m_flProtect);
+ void *pData = ClrVirtualAlloc(m_pPtrToEndOfCommittedRegion, dwSizeToCommit, MEM_COMMIT, (m_Options & LHF_EXECUTABLE) ? PAGE_EXECUTE_READWRITE : PAGE_READWRITE);
if (pData == NULL)
return FALSE;
@@ -1351,7 +1356,7 @@ again:
// Don't fill the memory we allocated - it is assumed to be zeroed - fill the memory after it
memset(pAllocatedBytes + dwRequestedSize, 0xEE, LOADER_HEAP_DEBUG_BOUNDARY);
#endif
- if (dwRequestedSize > 0)
+ if ((dwRequestedSize > 0) && (m_Options & LHF_ZEROINIT))
{
_ASSERTE_MSG(pAllocatedBytes[0] == 0 && memcmp(pAllocatedBytes, pAllocatedBytes + 1, dwRequestedSize - 1) == 0,
"LoaderHeap must return zero-initialized memory");
@@ -1529,7 +1534,8 @@ void UnlockedLoaderHeap::UnlockedBackoutMem(void *pMem,
{
// Cool. This was the last block allocated. We can just undo the allocation instead
// of going to the freelist.
- memset(pMem, 0, dwSize); // Must zero init this memory as AllocMem expect it
+ if (m_Options & LHF_ZEROINIT)
+ memset(pMem, 0x00, dwSize); // Fill freed region with 0
m_pAllocPtr = (BYTE*)pMem;
}
else
@@ -1639,6 +1645,7 @@ void *UnlockedLoaderHeap::UnlockedAllocAlignedMem_NoThrow(size_t dwRequestedSiz
((BYTE*&)pResult) += extra;
+
#ifdef _DEBUG
BYTE *pAllocatedBytes = (BYTE *)pResult;
#if LOADER_HEAP_DEBUG_BOUNDARY > 0
@@ -1646,7 +1653,7 @@ void *UnlockedLoaderHeap::UnlockedAllocAlignedMem_NoThrow(size_t dwRequestedSiz
memset(pAllocatedBytes + dwRequestedSize, 0xee, LOADER_HEAP_DEBUG_BOUNDARY);
#endif
- if (dwRequestedSize != 0)
+ if ((dwRequestedSize != 0) && (m_Options & LHF_ZEROINIT))
{
_ASSERTE_MSG(pAllocatedBytes[0] == 0 && memcmp(pAllocatedBytes, pAllocatedBytes + 1, dwRequestedSize - 1) == 0,
"LoaderHeap must return zero-initialized memory");
@@ -1766,6 +1773,16 @@ void *UnlockedLoaderHeap::UnlockedAllocMemForCode_NoThrow(size_t dwHeaderSize, s
#endif // #ifndef DACCESS_COMPILE
+BOOL UnlockedLoaderHeap::IsExecutable()
+{
+ return (m_Options & LHF_EXECUTABLE);
+}
+
+BOOL UnlockedLoaderHeap::IsZeroInit()
+{
+ return (m_Options & LHF_ZEROINIT);
+}
+
#ifdef DACCESS_COMPILE
void UnlockedLoaderHeap::EnumMemoryRegions(CLRDataEnumMemoryFlags flags)
diff --git a/src/vm/amd64/cgenamd64.cpp b/src/vm/amd64/cgenamd64.cpp
index 497abcd..20dca22 100644
--- a/src/vm/amd64/cgenamd64.cpp
+++ b/src/vm/amd64/cgenamd64.cpp
@@ -670,6 +670,19 @@ void UMEntryThunkCode::Encode(BYTE* pTargetCode, void* pvSecretParam)
_ASSERTE(DbgIsExecutable(&m_movR10[0], &m_jmpRAX[3]-&m_movR10[0]));
}
+void UMEntryThunkCode::Poison()
+{
+ CONTRACTL
+ {
+ NOTHROW;
+ GC_NOTRIGGER;
+ MODE_ANY;
+ }
+ CONTRACTL_END;
+
+ m_movR10[0] = X86_INSTR_INT3;
+}
+
UMEntryThunk* UMEntryThunk::Decode(LPVOID pCallback)
{
LIMITED_METHOD_CONTRACT;
diff --git a/src/vm/amd64/cgencpu.h b/src/vm/amd64/cgencpu.h
index 2d4dce0..8a27525 100644
--- a/src/vm/amd64/cgencpu.h
+++ b/src/vm/amd64/cgencpu.h
@@ -466,6 +466,7 @@ struct DECLSPEC_ALIGN(8) UMEntryThunkCode
BYTE m_padding2[5];
void Encode(BYTE* pTargetCode, void* pvSecretParam);
+ void Poison();
LPCBYTE GetEntryPoint() const
{
diff --git a/src/vm/arm/cgencpu.h b/src/vm/arm/cgencpu.h
index 181d5f1..6f128f6 100644
--- a/src/vm/arm/cgencpu.h
+++ b/src/vm/arm/cgencpu.h
@@ -988,6 +988,7 @@ struct DECLSPEC_ALIGN(4) UMEntryThunkCode
TADDR m_pvSecretParam;
void Encode(BYTE* pTargetCode, void* pvSecretParam);
+ void Poison();
LPCBYTE GetEntryPoint() const
{
diff --git a/src/vm/arm/stubs.cpp b/src/vm/arm/stubs.cpp
index 3088761..c832911 100644
--- a/src/vm/arm/stubs.cpp
+++ b/src/vm/arm/stubs.cpp
@@ -2523,6 +2523,12 @@ void UMEntryThunkCode::Encode(BYTE* pTargetCode, void* pvSecretParam)
FlushInstructionCache(GetCurrentProcess(),&m_code,sizeof(m_code));
}
+void UMEntryThunkCode::Poison()
+{
+ // Insert 'udf 0xff' at the entry point
+ m_code[0] = 0xdeff;
+}
+
///////////////////////////// UNIMPLEMENTED //////////////////////////////////
#ifndef DACCESS_COMPILE
diff --git a/src/vm/arm64/cgencpu.h b/src/vm/arm64/cgencpu.h
index d8bbcf7..5c522c5 100644
--- a/src/vm/arm64/cgencpu.h
+++ b/src/vm/arm64/cgencpu.h
@@ -481,6 +481,7 @@ struct DECLSPEC_ALIGN(16) UMEntryThunkCode
TADDR m_pvSecretParam;
void Encode(BYTE* pTargetCode, void* pvSecretParam);
+ void Poison();
LPCBYTE GetEntryPoint() const
{
diff --git a/src/vm/arm64/stubs.cpp b/src/vm/arm64/stubs.cpp
index 40d2749..df2124d 100644
--- a/src/vm/arm64/stubs.cpp
+++ b/src/vm/arm64/stubs.cpp
@@ -1244,6 +1244,10 @@ void UMEntryThunkCode::Encode(BYTE* pTargetCode, void* pvSecretParam)
FlushInstructionCache(GetCurrentProcess(),&m_code,sizeof(m_code));
}
+void UMEntryThunkCode::Poison()
+{
+
+}
#ifdef PROFILING_SUPPORTED
#include "proftoeeinterfaceimpl.h"
diff --git a/src/vm/dllimportcallback.cpp b/src/vm/dllimportcallback.cpp
index 90c01a4..8684c12 100644
--- a/src/vm/dllimportcallback.cpp
+++ b/src/vm/dllimportcallback.cpp
@@ -1111,13 +1111,8 @@ UMEntryThunk* UMEntryThunk::CreateUMEntryThunk()
UMEntryThunk * p;
-#ifdef FEATURE_WINDOWSPHONE
// On the phone, use loader heap to save memory commit of regular executable heap
p = (UMEntryThunk *)(void *)SystemDomain::GetGlobalLoaderAllocator()->GetExecutableHeap()->AllocMem(S_SIZE_T(sizeof(UMEntryThunk)));
-#else
- p = new (executable) UMEntryThunk;
- memset (p, 0, sizeof(*p));
-#endif
RETURN p;
}
@@ -1126,11 +1121,10 @@ void UMEntryThunk::Terminate()
{
WRAPPER_NO_CONTRACT;
-#ifdef FEATURE_WINDOWSPHONE
+ _ASSERTE(!SystemDomain::GetGlobalLoaderAllocator()->GetExecutableHeap()->IsZeroInit());
+ m_code.Poison();
+
SystemDomain::GetGlobalLoaderAllocator()->GetExecutableHeap()->BackoutMem(this, sizeof(UMEntryThunk));
-#else
- DeleteExecutable(this);
-#endif
}
VOID UMEntryThunk::FreeUMEntryThunk(UMEntryThunk* p)
diff --git a/src/vm/dllimportcallback.h b/src/vm/dllimportcallback.h
index af2a0b1..e79c5f0 100644
--- a/src/vm/dllimportcallback.h
+++ b/src/vm/dllimportcallback.h
@@ -326,10 +326,6 @@ public:
{
DestroyLongWeakHandle(GetObjectHandle());
}
-
-#ifdef _DEBUG
- FillMemory(this, sizeof(*this), 0xcc);
-#endif
}
void Terminate();
diff --git a/src/vm/i386/cgencpu.h b/src/vm/i386/cgencpu.h
index ff76d99..e4a623b 100644
--- a/src/vm/i386/cgencpu.h
+++ b/src/vm/i386/cgencpu.h
@@ -504,6 +504,7 @@ struct DECLSPEC_ALIGN(4) UMEntryThunkCode
const BYTE * m_execstub; // pointer to destination code // make sure the backpatched portion is dword aligned.
void Encode(BYTE* pTargetCode, void* pvSecretParam);
+ void Poison();
LPCBYTE GetEntryPoint() const
{
diff --git a/src/vm/i386/cgenx86.cpp b/src/vm/i386/cgenx86.cpp
index 0a276c0..ca81bb7 100644
--- a/src/vm/i386/cgenx86.cpp
+++ b/src/vm/i386/cgenx86.cpp
@@ -1587,6 +1587,13 @@ void UMEntryThunkCode::Encode(BYTE* pTargetCode, void* pvSecretParam)
FlushInstructionCache(GetCurrentProcess(),GetEntryPoint(),sizeof(UMEntryThunkCode));
}
+void UMEntryThunkCode::Poison()
+{
+ LIMITED_METHOD_CONTRACT;
+
+ m_movEAX = X86_INSTR_INT3;
+}
+
UMEntryThunk* UMEntryThunk::Decode(LPVOID pCallback)
{
LIMITED_METHOD_CONTRACT;
diff --git a/src/vm/loaderallocator.cpp b/src/vm/loaderallocator.cpp
index 70c8cab..5a3f8f5 100644
--- a/src/vm/loaderallocator.cpp
+++ b/src/vm/loaderallocator.cpp
@@ -1005,7 +1005,9 @@ void LoaderAllocator::Init(BaseDomain *pDomain, BYTE *pExecutableHeapMemory)
dwExecutableHeapReserveSize,
LOADERHEAP_PROFILE_COUNTER,
NULL,
- TRUE /* Make heap executable */);
+ TRUE /* Make heap executable */,
+ FALSE /* Disable zero-initialization (needed by UMEntryThunkCode::Poison) */
+ );
initReservedMem += dwExecutableHeapReserveSize;
}
--
1.9.1
|
