DBGPlugInLinux.cpp@ 74087

Last change on this file since 74087 was 73460, checked in by vboxsync, 6 years ago
IPRT,DBGF,Diggers: Moved DBGFRETURNTYPE and the unwind state structure to IPRT (dbg.h) in prep for debug module interface and more. Added stack unwind assist callback for the OS diggers so they can identify special stack frames and supply more info via the sure-register-value array and frame flags. Identify and decode NT/AMD64 trap frames.
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File size: 106.1 KB

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1	/* $Id: DBGPlugInLinux.cpp 73460 2018-08-02 21:06:59Z vboxsync $ */
2	/** @file
3	* DBGPlugInLinux - Debugger and Guest OS Digger Plugin For Linux.
4	*/
5
6	/*
7	* Copyright (C) 2008-2017 Oracle Corporation
8	*
9	* This file is part of VirtualBox Open Source Edition (OSE), as
10	* available from http://www.virtualbox.org. This file is free software;
11	* you can redistribute it and/or modify it under the terms of the GNU
12	* General Public License (GPL) as published by the Free Software
13	* Foundation, in version 2 as it comes in the "COPYING" file of the
14	* VirtualBox OSE distribution. VirtualBox OSE is distributed in the
15	* hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
16	*/
17
18
19	/*********************************************************************************************************************************
20	* Header Files *
21	*********************************************************************************************************************************/
22	#define LOG_GROUP LOG_GROUP_DBGF /// @todo add new log group.
23	#include "DBGPlugIns.h"
24	#include "DBGPlugInCommonELF.h"
25	#include <VBox/vmm/dbgf.h>
26	#include <VBox/dis.h>
27	#include <iprt/file.h>
28	#include <iprt/string.h>
29	#include <iprt/mem.h>
30	#include <iprt/stream.h>
31	#include <iprt/ctype.h>
32	#include <iprt/vfs.h>
33	#include <iprt/zip.h>
34
35
36	/*********************************************************************************************************************************
37	* Structures and Typedefs *
38	*********************************************************************************************************************************/
39
40	/** @name InternalLinux structures
41	* @{ */
42
43
44	/** @} */
45
46
47	/**
48	* Config item type.
49	*/
50	typedef enum DBGDIGGERLINUXCFGITEMTYPE
51	{
52	/** Invalid type. */
53	DBGDIGGERLINUXCFGITEMTYPE_INVALID = 0,
54	/** String. */
55	DBGDIGGERLINUXCFGITEMTYPE_STRING,
56	/** Number. */
57	DBGDIGGERLINUXCFGITEMTYPE_NUMBER,
58	/** Flag whether this feature is included in the
59	* kernel or as a module. */
60	DBGDIGGERLINUXCFGITEMTYPE_FLAG
61	} DBGDIGGERLINUXCFGITEMTYPE;
62
63	/**
64	* Item in the config database.
65	*/
66	typedef struct DBGDIGGERLINUXCFGITEM
67	{
68	/** String space core. */
69	RTSTRSPACECORE Core;
70	/** Config item type. */
71	DBGDIGGERLINUXCFGITEMTYPE enmType;
72	/** Data based on the type. */
73	union
74	{
75	/** Number. */
76	int64_t i64Num;
77	/** Flag. */
78	bool fModule;
79	/** String - variable in size. */
80	char aszString[1];
81	} u;
82	} DBGDIGGERLINUXCFGITEM;
83	/** Pointer to a config database item. */
84	typedef DBGDIGGERLINUXCFGITEM *PDBGDIGGERLINUXCFGITEM;
85	/** Pointer to a const config database item. */
86	typedef const DBGDIGGERLINUXCFGITEM *PCDBGDIGGERLINUXCFGITEM;
87
88	/**
89	* Linux guest OS digger instance data.
90	*/
91	typedef struct DBGDIGGERLINUX
92	{
93	/** Whether the information is valid or not.
94	* (For fending off illegal interface method calls.) */
95	bool fValid;
96	/** Set if 64-bit, clear if 32-bit. */
97	bool f64Bit;
98	/** Set if the kallsyms table uses relative addressing, clear
99	* if absolute addresses are used. */
100	bool fRelKrnlAddr;
101	/** The relative base when kernel symbols use offsets rather than
102	* absolute addresses. */
103	RTGCUINTPTR uKernelRelativeBase;
104
105	/** The address of the linux banner.
106	* This is set during probing. */
107	DBGFADDRESS AddrLinuxBanner;
108	/** Kernel base address.
109	* This is set during probing, refined during kallsyms parsing. */
110	DBGFADDRESS AddrKernelBase;
111	/** The kernel size. */
112	uint32_t cbKernel;
113
114	/** The number of kernel symbols (kallsyms_num_syms).
115	* This is set during init. */
116	uint32_t cKernelSymbols;
117	/** The size of the kernel name table (sizeof(kallsyms_names)). */
118	uint32_t cbKernelNames;
119	/** Number of entries in the kernel_markers table. */
120	uint32_t cKernelNameMarkers;
121	/** The size of the kernel symbol token table. */
122	uint32_t cbKernelTokenTable;
123	/** The address of the encoded kernel symbol names (kallsyms_names). */
124	DBGFADDRESS AddrKernelNames;
125	/** The address of the kernel symbol addresses (kallsyms_addresses). */
126	DBGFADDRESS AddrKernelAddresses;
127	/** The address of the kernel symbol name markers (kallsyms_markers). */
128	DBGFADDRESS AddrKernelNameMarkers;
129	/** The address of the kernel symbol token table (kallsyms_token_table). */
130	DBGFADDRESS AddrKernelTokenTable;
131	/** The address of the kernel symbol token index table (kallsyms_token_index). */
132	DBGFADDRESS AddrKernelTokenIndex;
133
134	/** The kernel message log interface. */
135	DBGFOSIDMESG IDmesg;
136
137	/** The config database root. */
138	RTSTRSPACE hCfgDb;
139	} DBGDIGGERLINUX;
140	/** Pointer to the linux guest OS digger instance data. */
141	typedef DBGDIGGERLINUX *PDBGDIGGERLINUX;
142
143
144	/**
145	* The current printk_log structure.
146	*/
147	typedef struct LNXPRINTKHDR
148	{
149	/** Monotonic timestamp. */
150	uint64_t nsTimestamp;
151	/** The total size of this message record. */
152	uint16_t cbTotal;
153	/** The size of the text part (immediately follows the header). */
154	uint16_t cbText;
155	/** The size of the optional dictionary part (follows the text). */
156	uint16_t cbDict;
157	/** The syslog facility number. */
158	uint8_t bFacility;
159	/** First 5 bits are internal flags, next 3 bits are log level. */
160	uint8_t fFlagsAndLevel;
161	} LNXPRINTKHDR;
162	AssertCompileSize(LNXPRINTKHDR, 2*sizeof(uint64_t));
163	/** Pointer to linux printk_log header. */
164	typedef LNXPRINTKHDR *PLNXPRINTKHDR;
165	/** Pointer to linux const printk_log header. */
166	typedef LNXPRINTKHDR const *PCLNXPRINTKHDR;
167
168
169	/*********************************************************************************************************************************
170	* Defined Constants And Macros *
171	*********************************************************************************************************************************/
172	/** First kernel map address for 32bit Linux hosts (__START_KERNEL_map). */
173	#define LNX32_KERNEL_ADDRESS_START UINT32_C(0xc0000000)
174	/** First kernel map address for 64bit Linux hosts (__START_KERNEL_map). */
175	#define LNX64_KERNEL_ADDRESS_START UINT64_C(0xffffffff80000000)
176	/** Validates a 32-bit linux kernel address */
177	#define LNX32_VALID_ADDRESS(Addr) ((Addr) > UINT32_C(0x80000000) && (Addr) < UINT32_C(0xfffff000))
178	/** Validates a 64-bit linux kernel address */
179	#define LNX64_VALID_ADDRESS(Addr) ((Addr) > UINT64_C(0xffff800000000000) && (Addr) < UINT64_C(0xfffffffffffff000))
180
181	/** The max kernel size. */
182	#define LNX_MAX_KERNEL_SIZE UINT32_C(0x0f000000)
183
184	/** The maximum size we expect for kallsyms_names. */
185	#define LNX_MAX_KALLSYMS_NAMES_SIZE UINT32_C(0x200000)
186	/** The maximum size we expect for kallsyms_token_table. */
187	#define LNX_MAX_KALLSYMS_TOKEN_TABLE_SIZE UINT32_C(0x10000)
188	/** The minimum number of symbols we expect in kallsyms_num_syms. */
189	#define LNX_MIN_KALLSYMS_SYMBOLS UINT32_C(2048)
190	/** The maximum number of symbols we expect in kallsyms_num_syms. */
191	#define LNX_MAX_KALLSYMS_SYMBOLS UINT32_C(1048576)
192	/** The min length an encoded symbol in kallsyms_names is expected to have. */
193	#define LNX_MIN_KALLSYMS_ENC_LENGTH UINT8_C(1)
194	/** The max length an encoded symbol in kallsyms_names is expected to have.
195	* @todo check real life here. */
196	#define LNX_MAX_KALLSYMS_ENC_LENGTH UINT8_C(28)
197	/** The approximate maximum length of a string token. */
198	#define LNX_MAX_KALLSYMS_TOKEN_LEN UINT16_C(32)
199	/** Maximum compressed config size expected. */
200	#define LNX_MAX_COMPRESSED_CFG_SIZE _1M
201
202	/** Module tag for linux ('linuxmod' on little endian ASCII systems). */
203	#define DIG_LNX_MOD_TAG UINT64_C(0x545f5d78758e898c)
204
205
206	/*********************************************************************************************************************************
207	* Internal Functions *
208	*********************************************************************************************************************************/
209	static DECLCALLBACK(int) dbgDiggerLinuxInit(PUVM pUVM, void *pvData);
210
211
212	/*********************************************************************************************************************************
213	* Global Variables *
214	*********************************************************************************************************************************/
215	/** Table of common linux kernel addresses. */
216	static uint64_t g_au64LnxKernelAddresses[] =
217	{
218	UINT64_C(0xc0100000),
219	UINT64_C(0x90100000),
220	UINT64_C(0xffffffff80200000)
221	};
222
223	static const uint8_t g_abLinuxVersion[] = "Linux version ";
224
225	/**
226	* Converts a given offset into an absolute address if relative kernel offsets are used for
227	* kallsyms.
228	*
229	* @returns The absolute kernel address.
230	* @param pThis The Linux digger data.
231	* @param uOffset The offset to convert.
232	*/
233	DECLINLINE(RTGCUINTPTR) dbgDiggerLinuxConvOffsetToAddr(PDBGDIGGERLINUX pThis, int32_t uOffset)
234	{
235	RTGCUINTPTR uAddr;
236
237	/*
238	* How the absolute address is calculated from the offset depends on the
239	* CONFIG_KALLSYMS_ABSOLUTE_PERCPU config which is only set for 64bit
240	* SMP kernels (we assume that all 64bit kernels always have SMP enabled too).
241	*/
242	if (pThis->f64Bit)
243	{
244	if (uOffset >= 0)
245	uAddr = uOffset;
246	else
247	uAddr = pThis->uKernelRelativeBase - 1 - uOffset;
248	}
249	else
250	uAddr = pThis->uKernelRelativeBase + (uint32_t)uOffset;
251
252	return uAddr;
253	}
254
255	/**
256	* Disassembles a simple getter returning the value for it.
257	*
258	* @returns VBox status code.
259	* @param pThis The Linux digger data.
260	* @param pUVM The VM handle.
261	* @param hMod The module to use.
262	* @param pszSymbol The symbol of the getter.
263	* @param pvVal Where to store the value on success.
264	* @param cbVal Size of the value in bytes.
265	*/
266	static int dbgDiggerLinuxDisassembleSimpleGetter(PDBGDIGGERLINUX pThis, PUVM pUVM, RTDBGMOD hMod,
267	const char pszSymbol, void pvVal, uint32_t cbVal)
268	{
269	int rc = VINF_SUCCESS;
270
271	RTDBGSYMBOL SymInfo;
272	rc = RTDbgModSymbolByName(hMod, pszSymbol, &SymInfo);
273	if (RT_SUCCESS(rc))
274	{
275	/*
276	* Do the diassembling. Disassemble until a ret instruction is encountered
277	* or a limit is reached (don't want to disassemble for too long as the getter
278	* should be short).
279	* push and pop instructions are skipped as well as any mov instructions not
280	* touching the rax or eax register (depending on the size of the value).
281	*/
282	unsigned cInstrDisassembled = 0;
283	uint32_t offInstr = 0;
284	bool fRet = false;
285	DISSTATE DisState;
286	RT_ZERO(DisState);
287
288	do
289	{
290	DBGFADDRESS Addr;
291	RTGCPTR GCPtrCur = (RTGCPTR)SymInfo.Value + pThis->AddrKernelBase.FlatPtr + offInstr;
292	DBGFR3AddrFromFlat(pUVM, &Addr, GCPtrCur);
293
294	/* Prefetch the instruction. */
295	uint8_t abInstr[32];
296	rc = DBGFR3MemRead(pUVM, 0 /idCpu/, &Addr, &abInstr[0], sizeof(abInstr));
297	if (RT_SUCCESS(rc))
298	{
299	uint32_t cbInstr = 0;
300
301	rc = DISInstr(&abInstr[0], pThis->f64Bit ? DISCPUMODE_64BIT : DISCPUMODE_32BIT, &DisState, &cbInstr);
302	if (RT_SUCCESS(rc))
303	{
304	switch (DisState.pCurInstr->uOpcode)
305	{
306	case OP_PUSH:
307	case OP_POP:
308	case OP_NOP:
309	case OP_LEA:
310	break;
311	case OP_RETN:
312	/* Getter returned, abort disassembling. */
313	fRet = true;
314	break;
315	case OP_MOV:
316	/*
317	* Check that the destination is either rax or eax depending on the
318	* value size.
319	*
320	* Param1 is the destination and Param2 the source.
321	*/
322	if ( ( ( (DisState.Param1.fUse & (DISUSE_BASE \| DISUSE_REG_GEN32))
323	&& cbVal == sizeof(uint32_t))
324	\|\| ( (DisState.Param1.fUse & (DISUSE_BASE \| DISUSE_REG_GEN64))
325	&& cbVal == sizeof(uint64_t)))
326	&& DisState.Param1.Base.idxGenReg == DISGREG_RAX)
327	{
328	/* Parse the source. */
329	if (DisState.Param2.fUse & (DISUSE_IMMEDIATE32 \| DISUSE_IMMEDIATE64))
330	memcpy(pvVal, &DisState.Param2.uValue, cbVal);
331	else if (DisState.Param2.fUse & (DISUSE_RIPDISPLACEMENT32\|DISUSE_DISPLACEMENT32\|DISUSE_DISPLACEMENT64))
332	{
333	RTGCPTR GCPtrVal = 0;
334
335	if (DisState.Param2.fUse & DISUSE_RIPDISPLACEMENT32)
336	GCPtrVal = GCPtrCur + DisState.Param2.uDisp.i32 + cbInstr;
337	else if (DisState.Param2.fUse & DISUSE_DISPLACEMENT32)
338	GCPtrVal = (RTGCPTR)DisState.Param2.uDisp.u32;
339	else if (DisState.Param2.fUse & DISUSE_DISPLACEMENT64)
340	GCPtrVal = (RTGCPTR)DisState.Param2.uDisp.u64;
341	else
342	AssertMsgFailedBreakStmt(("Invalid displacement\n"), rc = VERR_INVALID_STATE);
343
344	DBGFADDRESS AddrVal;
345	rc = DBGFR3MemRead(pUVM, 0 /idCpu/,
346	DBGFR3AddrFromFlat(pUVM, &AddrVal, GCPtrVal),
347	pvVal, cbVal);
348	}
349	}
350	break;
351	default:
352	/* All other instructions will cause an error for now (playing safe here). */
353	rc = VERR_INVALID_PARAMETER;
354	break;
355	}
356	cInstrDisassembled++;
357	offInstr += cbInstr;
358	}
359	}
360	} while ( RT_SUCCESS(rc)
361	&& cInstrDisassembled < 20
362	&& !fRet);
363	}
364
365	return rc;
366	}
367
368	/**
369	* Try to get at the log buffer starting address and size by disassembling emit_log_char.
370	*
371	* @returns VBox status code.
372	* @param pThis The Linux digger data.
373	* @param pUVM The VM handle.
374	* @param hMod The module to use.
375	* @param pGCPtrLogBuf Where to store the log buffer pointer on success.
376	* @param pcbLogBuf Where to store the size of the log buffer on success.
377	*/
378	static int dbgDiggerLinuxQueryAsciiLogBufferPtrs(PDBGDIGGERLINUX pThis, PUVM pUVM, RTDBGMOD hMod,
379	RTGCPTR pGCPtrLogBuf, uint32_t pcbLogBuf)
380	{
381	int rc = VINF_SUCCESS;
382
383	/**
384	* We disassemble emit_log_char to get at the log buffer address and size.
385	* This is used in case the symbols are not exported in kallsyms.
386	*
387	* This is what it typically looks like:
388	* vmlinux!emit_log_char:
389	* %00000000c01204a1 56 push esi
390	* %00000000c01204a2 8b 35 d0 1c 34 c0 mov esi, dword [0c0341cd0h]
391	* %00000000c01204a8 53 push ebx
392	* %00000000c01204a9 8b 1d 74 3b 3e c0 mov ebx, dword [0c03e3b74h]
393	* %00000000c01204af 8b 0d d8 1c 34 c0 mov ecx, dword [0c0341cd8h]
394	* %00000000c01204b5 8d 56 ff lea edx, [esi-001h]
395	* %00000000c01204b8 21 da and edx, ebx
396	* %00000000c01204ba 88 04 11 mov byte [ecx+edx], al
397	* %00000000c01204bd 8d 53 01 lea edx, [ebx+001h]
398	* %00000000c01204c0 89 d0 mov eax, edx
399	* [...]
400	*/
401	RTDBGSYMBOL SymInfo;
402	rc = RTDbgModSymbolByName(hMod, "emit_log_char", &SymInfo);
403	if (RT_SUCCESS(rc))
404	{
405	/*
406	* Do the diassembling. Disassemble until a ret instruction is encountered
407	* or a limit is reached (don't want to disassemble for too long as the getter
408	* should be short). Certain instructions found are ignored (push, nop, etc.).
409	*/
410	unsigned cInstrDisassembled = 0;
411	uint32_t offInstr = 0;
412	bool fRet = false;
413	DISSTATE DisState;
414	unsigned cAddressesUsed = 0;
415	struct { size_t cb; RTGCPTR GCPtrOrigSrc; } aAddresses[5];
416	RT_ZERO(DisState);
417	RT_ZERO(aAddresses);
418
419	do
420	{
421	DBGFADDRESS Addr;
422	RTGCPTR GCPtrCur = (RTGCPTR)SymInfo.Value + pThis->AddrKernelBase.FlatPtr + offInstr;
423	DBGFR3AddrFromFlat(pUVM, &Addr, GCPtrCur);
424
425	/* Prefetch the instruction. */
426	uint8_t abInstr[32];
427	rc = DBGFR3MemRead(pUVM, 0 /idCpu/, &Addr, &abInstr[0], sizeof(abInstr));
428	if (RT_SUCCESS(rc))
429	{
430	uint32_t cbInstr = 0;
431
432	rc = DISInstr(&abInstr[0], pThis->f64Bit ? DISCPUMODE_64BIT : DISCPUMODE_32BIT, &DisState, &cbInstr);
433	if (RT_SUCCESS(rc))
434	{
435	switch (DisState.pCurInstr->uOpcode)
436	{
437	case OP_PUSH:
438	case OP_POP:
439	case OP_NOP:
440	case OP_LEA:
441	case OP_AND:
442	case OP_CBW:
443	break;
444	case OP_RETN:
445	/* emit_log_char returned, abort disassembling. */
446	rc = VERR_NOT_FOUND;
447	fRet = true;
448	break;
449	case OP_MOV:
450	case OP_MOVSXD:
451	/*
452	* If a mov is encountered writing to memory with al (or dil for amd64) being the source the
453	* character is stored and we can infer the base address and size of the log buffer from
454	* the source addresses.
455	*/
456	if ( (DisState.Param2.fUse & DISUSE_REG_GEN8)
457	&& ( (DisState.Param2.Base.idxGenReg == DISGREG_AL && !pThis->f64Bit)
458	\|\| (DisState.Param2.Base.idxGenReg == DISGREG_DIL && pThis->f64Bit))
459	&& DISUSE_IS_EFFECTIVE_ADDR(DisState.Param1.fUse))
460	{
461	RTGCPTR GCPtrLogBuf = 0;
462	uint32_t cbLogBuf = 0;
463
464	/*
465	* We can stop disassembling now and inspect all registers, look for a valid kernel address first.
466	* Only one of the accessed registers should hold a valid kernel address.
467	* For the log size look for the biggest non kernel address.
468	*/
469	for (unsigned i = 0; i < cAddressesUsed; i++)
470	{
471	DBGFADDRESS AddrVal;
472	union { uint8_t abVal[8]; uint32_t u32Val; uint64_t u64Val; } Val;
473
474	rc = DBGFR3MemRead(pUVM, 0 /idCpu/,
475	DBGFR3AddrFromFlat(pUVM, &AddrVal, aAddresses[i].GCPtrOrigSrc),
476	&Val.abVal[0], aAddresses[i].cb);
477	if (RT_SUCCESS(rc))
478	{
479	if (pThis->f64Bit && aAddresses[i].cb == sizeof(uint64_t))
480	{
481	if (LNX64_VALID_ADDRESS(Val.u64Val))
482	{
483	if (GCPtrLogBuf == 0)
484	GCPtrLogBuf = Val.u64Val;
485	else
486	{
487	rc = VERR_NOT_FOUND;
488	break;
489	}
490	}
491	}
492	else
493	{
494	AssertMsgBreakStmt(aAddresses[i].cb == sizeof(uint32_t),
495	("Invalid value size\n"), rc = VERR_INVALID_STATE);
496
497	/* Might be a kernel address or a size indicator. */
498	if (!pThis->f64Bit && LNX32_VALID_ADDRESS(Val.u32Val))
499	{
500	if (GCPtrLogBuf == 0)
501	GCPtrLogBuf = Val.u32Val;
502	else
503	{
504	rc = VERR_NOT_FOUND;
505	break;
506	}
507	}
508	else
509	{
510	/*
511	* The highest value will be the log buffer because the other
512	* accessed variables are indexes into the buffer and hence
513	* always smaller than the size.
514	*/
515	if (cbLogBuf < Val.u32Val)
516	cbLogBuf = Val.u32Val;
517	}
518	}
519	}
520	}
521
522	if ( RT_SUCCESS(rc)
523	&& GCPtrLogBuf != 0
524	&& cbLogBuf != 0)
525	{
526	*pGCPtrLogBuf = GCPtrLogBuf;
527	*pcbLogBuf = cbLogBuf;
528	}
529	else if (RT_SUCCESS(rc))
530	rc = VERR_NOT_FOUND;
531
532	fRet = true;
533	break;
534	}
535	else
536	{
537	/*
538	* In case of a memory to register move store the destination register index and the
539	* source address in the relation table for later processing.
540	*/
541	if ( (DisState.Param1.fUse & (DISUSE_BASE \| DISUSE_REG_GEN32 \| DISUSE_REG_GEN64))
542	&& (DisState.Param2.cb == sizeof(uint32_t) \|\| DisState.Param2.cb == sizeof(uint64_t))
543	&& (DisState.Param2.fUse & (DISUSE_RIPDISPLACEMENT32\|DISUSE_DISPLACEMENT32\|DISUSE_DISPLACEMENT64)))
544	{
545	RTGCPTR GCPtrVal = 0;
546
547	if (DisState.Param2.fUse & DISUSE_RIPDISPLACEMENT32)
548	GCPtrVal = GCPtrCur + DisState.Param2.uDisp.i32 + cbInstr;
549	else if (DisState.Param2.fUse & DISUSE_DISPLACEMENT32)
550	GCPtrVal = (RTGCPTR)DisState.Param2.uDisp.u32;
551	else if (DisState.Param2.fUse & DISUSE_DISPLACEMENT64)
552	GCPtrVal = (RTGCPTR)DisState.Param2.uDisp.u64;
553	else
554	AssertMsgFailedBreakStmt(("Invalid displacement\n"), rc = VERR_INVALID_STATE);
555
556	if (cAddressesUsed < RT_ELEMENTS(aAddresses))
557	{
558	/* movsxd reads always 32bits. */
559	if (DisState.pCurInstr->uOpcode == OP_MOVSXD)
560	aAddresses[cAddressesUsed].cb = sizeof(uint32_t);
561	else
562	aAddresses[cAddressesUsed].cb = DisState.Param2.cb;
563	aAddresses[cAddressesUsed].GCPtrOrigSrc = GCPtrVal;
564	cAddressesUsed++;
565	}
566	else
567	{
568	rc = VERR_INVALID_PARAMETER;
569	break;
570	}
571	}
572	}
573	break;
574	default:
575	/* All other instructions will cause an error for now (playing safe here). */
576	rc = VERR_INVALID_PARAMETER;
577	break;
578	}
579	cInstrDisassembled++;
580	offInstr += cbInstr;
581	}
582	}
583	} while ( RT_SUCCESS(rc)
584	&& cInstrDisassembled < 20
585	&& !fRet);
586	}
587
588	return rc;
589	}
590
591	/**
592	* Try to get at the log buffer starting address and size by disassembling some exposed helpers.
593	*
594	* @returns VBox status code.
595	* @param pThis The Linux digger data.
596	* @param pUVM The VM handle.
597	* @param hMod The module to use.
598	* @param pGCPtrLogBuf Where to store the log buffer pointer on success.
599	* @param pcbLogBuf Where to store the size of the log buffer on success.
600	*/
601	static int dbgDiggerLinuxQueryLogBufferPtrs(PDBGDIGGERLINUX pThis, PUVM pUVM, RTDBGMOD hMod,
602	RTGCPTR pGCPtrLogBuf, uint32_t pcbLogBuf)
603	{
604	int rc = VINF_SUCCESS;
605
606	struct { void pvVar; uint32_t cbHost, cbGuest; const char pszSymbol; } aSymbols[] =
607	{
608	{ pGCPtrLogBuf, (uint32_t)sizeof(RTGCPTR), (uint32_t)(pThis->f64Bit ? sizeof(uint64_t) : sizeof(uint32_t)), "log_buf_addr_get" },
609	{ pcbLogBuf, (uint32_t)sizeof(uint32_t), (uint32_t)sizeof(uint32_t), "log_buf_len_get" }
610	};
611	for (uint32_t i = 0; i < RT_ELEMENTS(aSymbols) && RT_SUCCESS(rc); i++)
612	{
613	RT_BZERO(aSymbols[i].pvVar, aSymbols[i].cbHost);
614	Assert(aSymbols[i].cbHost >= aSymbols[i].cbGuest);
615	rc = dbgDiggerLinuxDisassembleSimpleGetter(pThis, pUVM, hMod, aSymbols[i].pszSymbol,
616	aSymbols[i].pvVar, aSymbols[i].cbGuest);
617	}
618
619	return rc;
620	}
621
622	/**
623	* Returns whether the log buffer is a simple ascii buffer or a record based implementation
624	* based on the kernel version found.
625	*
626	* @returns Flag whether the log buffer is the simple ascii buffer.
627	* @param pThis The Linux digger data.
628	* @param pUVM The user mode VM handle.
629	*/
630	static bool dbgDiggerLinuxLogBufferIsAsciiBuffer(PDBGDIGGERLINUX pThis, PUVM pUVM)
631	{
632	char szTmp[128];
633	char const *pszVer = &szTmp[sizeof(g_abLinuxVersion) - 1];
634
635	RT_ZERO(szTmp);
636	int rc = DBGFR3MemReadString(pUVM, 0, &pThis->AddrLinuxBanner, szTmp, sizeof(szTmp) - 1);
637	if ( RT_SUCCESS(rc)
638	&& RTStrVersionCompare(pszVer, "3.4") == -1)
639	return true;
640
641	return false;
642	}
643
644	/**
645	* Worker to get at the kernel log for pre 3.4 kernels where the log buffer was just a char buffer.
646	*
647	* @returns VBox status code.
648	* @param pThis The Linux digger data.
649	* @param pUVM The VM user mdoe handle.
650	* @param hMod The debug module handle.
651	* @param fFlags Flags reserved for future use, MBZ.
652	* @param cMessages The number of messages to retrieve, counting from the
653	* end of the log (i.e. like tail), use UINT32_MAX for all.
654	* @param pszBuf The output buffer.
655	* @param cbBuf The buffer size.
656	* @param pcbActual Where to store the number of bytes actually returned,
657	* including zero terminator. On VERR_BUFFER_OVERFLOW this
658	* holds the necessary buffer size. Optional.
659	*/
660	static int dbgDiggerLinuxLogBufferQueryAscii(PDBGDIGGERLINUX pThis, PUVM pUVM, RTDBGMOD hMod,
661	uint32_t fFlags, uint32_t cMessages,
662	char pszBuf, size_t cbBuf, size_t pcbActual)
663	{
664	RT_NOREF2(fFlags, cMessages);
665	int rc = VINF_SUCCESS;
666	RTGCPTR GCPtrLogBuf;
667	uint32_t cbLogBuf;
668
669	struct { void pvVar; size_t cbHost, cbGuest; const char pszSymbol; } aSymbols[] =
670	{
671	{ &GCPtrLogBuf, sizeof(GCPtrLogBuf), pThis->f64Bit ? sizeof(uint64_t) : sizeof(uint32_t), "log_buf" },
672	{ &cbLogBuf, sizeof(cbLogBuf), sizeof(cbLogBuf), "log_buf_len" },
673	};
674	for (uint32_t i = 0; i < RT_ELEMENTS(aSymbols); i++)
675	{
676	RTDBGSYMBOL SymInfo;
677	rc = RTDbgModSymbolByName(hMod, aSymbols[i].pszSymbol, &SymInfo);
678	if (RT_SUCCESS(rc))
679	{
680	RT_BZERO(aSymbols[i].pvVar, aSymbols[i].cbHost);
681	Assert(aSymbols[i].cbHost >= aSymbols[i].cbGuest);
682	DBGFADDRESS Addr;
683	rc = DBGFR3MemRead(pUVM, 0 /idCpu/,
684	DBGFR3AddrFromFlat(pUVM, &Addr, (RTGCPTR)SymInfo.Value + pThis->AddrKernelBase.FlatPtr),
685	aSymbols[i].pvVar, aSymbols[i].cbGuest);
686	if (RT_SUCCESS(rc))
687	continue;
688	Log(("dbgDiggerLinuxIDmsg_QueryKernelLog: Reading '%s' at %RGv: %Rrc\n", aSymbols[i].pszSymbol, Addr.FlatPtr, rc));
689	}
690	else
691	Log(("dbgDiggerLinuxIDmsg_QueryKernelLog: Error looking up '%s': %Rrc\n", aSymbols[i].pszSymbol, rc));
692	rc = VERR_NOT_FOUND;
693	break;
694	}
695
696	/*
697	* Some kernels don't expose the variables in kallsyms so we have to try disassemble
698	* some public helpers to get at the addresses.
699	*
700	* @todo: Maybe cache those values so we don't have to do the heavy work every time?
701	*/
702	if (rc == VERR_NOT_FOUND)
703	{
704	rc = dbgDiggerLinuxQueryAsciiLogBufferPtrs(pThis, pUVM, hMod, &GCPtrLogBuf, &cbLogBuf);
705	if (RT_FAILURE(rc))
706	return rc;
707	}
708
709	/*
710	* Check if the values make sense.
711	*/
712	if (pThis->f64Bit ? !LNX64_VALID_ADDRESS(GCPtrLogBuf) : !LNX32_VALID_ADDRESS(GCPtrLogBuf))
713	{
714	Log(("dbgDiggerLinuxIDmsg_QueryKernelLog: 'log_buf' value %RGv is not valid.\n", GCPtrLogBuf));
715	return VERR_NOT_FOUND;
716	}
717	if ( cbLogBuf < 4096
718	\|\| !RT_IS_POWER_OF_TWO(cbLogBuf)
719	\|\| cbLogBuf > 16*_1M)
720	{
721	Log(("dbgDiggerLinuxIDmsg_QueryKernelLog: 'log_buf_len' value %#x is not valid.\n", cbLogBuf));
722	return VERR_NOT_FOUND;
723	}
724
725	/*
726	* Read the whole log buffer.
727	*/
728	uint8_t pbLogBuf = (uint8_t )RTMemAlloc(cbLogBuf);
729	if (!pbLogBuf)
730	{
731	Log(("dbgDiggerLinuxIDmsg_QueryKernelLog: Failed to allocate %#x bytes for log buffer\n", cbLogBuf));
732	return VERR_NO_MEMORY;
733	}
734	DBGFADDRESS Addr;
735	rc = DBGFR3MemRead(pUVM, 0 /idCpu/, DBGFR3AddrFromFlat(pUVM, &Addr, GCPtrLogBuf), pbLogBuf, cbLogBuf);
736	if (RT_FAILURE(rc))
737	{
738	Log(("dbgDiggerLinuxIDmsg_QueryKernelLog: Error reading %#x bytes of log buffer at %RGv: %Rrc\n",
739	cbLogBuf, Addr.FlatPtr, rc));
740	RTMemFree(pbLogBuf);
741	return VERR_NOT_FOUND;
742	}
743
744	/** @todo Try to parse where the single messages start to make use of cMessages. */
745	size_t cchLength = RTStrNLen((const char *)pbLogBuf, cbLogBuf);
746	memcpy(&pszBuf[0], pbLogBuf, RT_MIN(cbBuf, cchLength));
747
748	/* Done with the buffer. */
749	RTMemFree(pbLogBuf);
750
751	/* Set return size value. */
752	if (pcbActual)
753	*pcbActual = RT_MIN(cbBuf, cchLength);
754
755	return cbBuf <= cchLength ? VERR_BUFFER_OVERFLOW : VINF_SUCCESS;
756	}
757
758	/**
759	* Worker to get at the kernel log for post 3.4 kernels where the log buffer contains records.
760	*
761	* @returns VBox status code.
762	* @param pThis The Linux digger data.
763	* @param pUVM The VM user mdoe handle.
764	* @param hMod The debug module handle.
765	* @param fFlags Flags reserved for future use, MBZ.
766	* @param cMessages The number of messages to retrieve, counting from the
767	* end of the log (i.e. like tail), use UINT32_MAX for all.
768	* @param pszBuf The output buffer.
769	* @param cbBuf The buffer size.
770	* @param pcbActual Where to store the number of bytes actually returned,
771	* including zero terminator. On VERR_BUFFER_OVERFLOW this
772	* holds the necessary buffer size. Optional.
773	*/
774	static int dbgDiggerLinuxLogBufferQueryRecords(PDBGDIGGERLINUX pThis, PUVM pUVM, RTDBGMOD hMod,
775	uint32_t fFlags, uint32_t cMessages,
776	char pszBuf, size_t cbBuf, size_t pcbActual)
777	{
778	RT_NOREF1(fFlags);
779	int rc = VINF_SUCCESS;
780	RTGCPTR GCPtrLogBuf;
781	uint32_t cbLogBuf;
782	uint32_t idxFirst;
783	uint32_t idxNext;
784
785	struct { void pvVar; size_t cbHost, cbGuest; const char pszSymbol; } aSymbols[] =
786	{
787	{ &GCPtrLogBuf, sizeof(GCPtrLogBuf), pThis->f64Bit ? sizeof(uint64_t) : sizeof(uint32_t), "log_buf" },
788	{ &cbLogBuf, sizeof(cbLogBuf), sizeof(cbLogBuf), "log_buf_len" },
789	{ &idxFirst, sizeof(idxFirst), sizeof(idxFirst), "log_first_idx" },
790	{ &idxNext, sizeof(idxNext), sizeof(idxNext), "log_next_idx" },
791	};
792	for (uint32_t i = 0; i < RT_ELEMENTS(aSymbols); i++)
793	{
794	RTDBGSYMBOL SymInfo;
795	rc = RTDbgModSymbolByName(hMod, aSymbols[i].pszSymbol, &SymInfo);
796	if (RT_SUCCESS(rc))
797	{
798	RT_BZERO(aSymbols[i].pvVar, aSymbols[i].cbHost);
799	Assert(aSymbols[i].cbHost >= aSymbols[i].cbGuest);
800	DBGFADDRESS Addr;
801	rc = DBGFR3MemRead(pUVM, 0 /idCpu/,
802	DBGFR3AddrFromFlat(pUVM, &Addr, (RTGCPTR)SymInfo.Value + pThis->AddrKernelBase.FlatPtr),
803	aSymbols[i].pvVar, aSymbols[i].cbGuest);
804	if (RT_SUCCESS(rc))
805	continue;
806	Log(("dbgDiggerLinuxIDmsg_QueryKernelLog: Reading '%s' at %RGv: %Rrc\n", aSymbols[i].pszSymbol, Addr.FlatPtr, rc));
807	}
808	else
809	Log(("dbgDiggerLinuxIDmsg_QueryKernelLog: Error looking up '%s': %Rrc\n", aSymbols[i].pszSymbol, rc));
810	rc = VERR_NOT_FOUND;
811	break;
812	}
813
814	/*
815	* Some kernels don't expose the variables in kallsyms so we have to try disassemble
816	* some public helpers to get at the addresses.
817	*
818	* @todo: Maybe cache those values so we don't have to do the heavy work every time?
819	*/
820	if (rc == VERR_NOT_FOUND)
821	{
822	idxFirst = 0;
823	idxNext = 0;
824	rc = dbgDiggerLinuxQueryLogBufferPtrs(pThis, pUVM, hMod, &GCPtrLogBuf, &cbLogBuf);
825	if (RT_FAILURE(rc))
826	return rc;
827	}
828
829	/*
830	* Check if the values make sense.
831	*/
832	if (pThis->f64Bit ? !LNX64_VALID_ADDRESS(GCPtrLogBuf) : !LNX32_VALID_ADDRESS(GCPtrLogBuf))
833	{
834	Log(("dbgDiggerLinuxIDmsg_QueryKernelLog: 'log_buf' value %RGv is not valid.\n", GCPtrLogBuf));
835	return VERR_NOT_FOUND;
836	}
837	if ( cbLogBuf < 4096
838	\|\| !RT_IS_POWER_OF_TWO(cbLogBuf)
839	\|\| cbLogBuf > 16*_1M)
840	{
841	Log(("dbgDiggerLinuxIDmsg_QueryKernelLog: 'log_buf_len' value %#x is not valid.\n", cbLogBuf));
842	return VERR_NOT_FOUND;
843	}
844	uint32_t const cbLogAlign = 4;
845	if ( idxFirst > cbLogBuf - sizeof(LNXPRINTKHDR)
846	\|\| (idxFirst & (cbLogAlign - 1)) != 0)
847	{
848	Log(("dbgDiggerLinuxIDmsg_QueryKernelLog: 'log_first_idx' value %#x is not valid.\n", idxFirst));
849	return VERR_NOT_FOUND;
850	}
851	if ( idxNext > cbLogBuf - sizeof(LNXPRINTKHDR)
852	\|\| (idxNext & (cbLogAlign - 1)) != 0)
853	{
854	Log(("dbgDiggerLinuxIDmsg_QueryKernelLog: 'log_next_idx' value %#x is not valid.\n", idxNext));
855	return VERR_NOT_FOUND;
856	}
857
858	/*
859	* Read the whole log buffer.
860	*/
861	uint8_t pbLogBuf = (uint8_t )RTMemAlloc(cbLogBuf);
862	if (!pbLogBuf)
863	{
864	Log(("dbgDiggerLinuxIDmsg_QueryKernelLog: Failed to allocate %#x bytes for log buffer\n", cbLogBuf));
865	return VERR_NO_MEMORY;
866	}
867	DBGFADDRESS Addr;
868	rc = DBGFR3MemRead(pUVM, 0 /idCpu/, DBGFR3AddrFromFlat(pUVM, &Addr, GCPtrLogBuf), pbLogBuf, cbLogBuf);
869	if (RT_FAILURE(rc))
870	{
871	Log(("dbgDiggerLinuxIDmsg_QueryKernelLog: Error reading %#x bytes of log buffer at %RGv: %Rrc\n",
872	cbLogBuf, Addr.FlatPtr, rc));
873	RTMemFree(pbLogBuf);
874	return VERR_NOT_FOUND;
875	}
876
877	/*
878	* Count the messages in the buffer while doing some basic validation.
879	*/
880	uint32_t const cbUsed = idxFirst == idxNext ? cbLogBuf /* could be empty... */
881	: idxFirst < idxNext ? idxNext - idxFirst : cbLogBuf - idxFirst + idxNext;
882	uint32_t cbLeft = cbUsed;
883	uint32_t offCur = idxFirst;
884	uint32_t cLogMsgs = 0;
885
886	while (cbLeft > 0)
887	{
888	PCLNXPRINTKHDR pHdr = (PCLNXPRINTKHDR)&pbLogBuf[offCur];
889	if (!pHdr->cbTotal)
890	{
891	/* Wrap around packet, most likely... */
892	if (cbLogBuf - offCur >= cbLeft)
893	break;
894	offCur = 0;
895	pHdr = (PCLNXPRINTKHDR)&pbLogBuf[offCur];
896	}
897	if (RT_UNLIKELY( pHdr->cbTotal > cbLogBuf - sizeof(*pHdr) - offCur
898	\|\| pHdr->cbTotal > cbLeft
899	\|\| (pHdr->cbTotal & (cbLogAlign - 1)) != 0
900	\|\| pHdr->cbTotal < (uint32_t)pHdr->cbText + (uint32_t)pHdr->cbDict + sizeof(*pHdr) ))
901	{
902	Log(("dbgDiggerLinuxIDmsg_QueryKernelLog: Invalid printk_log record at %#x: cbTotal=%#x cbText=%#x cbDict=%#x cbLogBuf=%#x cbLeft=%#x\n",
903	offCur, pHdr->cbTotal, pHdr->cbText, pHdr->cbDict, cbLogBuf, cbLeft));
904	rc = VERR_INVALID_STATE;
905	break;
906	}
907
908	if (pHdr->cbText > 0)
909	cLogMsgs++;
910
911	/* next */
912	offCur += pHdr->cbTotal;
913	cbLeft -= pHdr->cbTotal;
914	}
915	if (RT_FAILURE(rc))
916	{
917	RTMemFree(pbLogBuf);
918	return rc;
919	}
920
921	/*
922	* Copy the messages into the output buffer.
923	*/
924	offCur = idxFirst;
925	cbLeft = cbUsed;
926
927	/* Skip messages that the caller doesn't want. */
928	if (cMessages < cLogMsgs)
929	{
930	uint32_t cToSkip = cLogMsgs - cMessages;
931	while (cToSkip > 0)
932	{
933	PCLNXPRINTKHDR pHdr = (PCLNXPRINTKHDR)&pbLogBuf[offCur];
934	if (!pHdr->cbTotal)
935	{
936	offCur = 0;
937	pHdr = (PCLNXPRINTKHDR)&pbLogBuf[offCur];
938	}
939	if (pHdr->cbText > 0)
940	cToSkip--;
941
942	/* next */
943	offCur += pHdr->cbTotal;
944	cbLeft -= pHdr->cbTotal;
945	}
946	}
947
948	/* Now copy the messages. */
949	size_t offDst = 0;
950	while (cbLeft > 0)
951	{
952	PCLNXPRINTKHDR pHdr = (PCLNXPRINTKHDR)&pbLogBuf[offCur];
953	if (!pHdr->cbTotal)
954	{
955	if (cbLogBuf - offCur >= cbLeft)
956	break;
957	offCur = 0;
958	pHdr = (PCLNXPRINTKHDR)&pbLogBuf[offCur];
959	}
960
961	if (pHdr->cbText > 0)
962	{
963	char pchText = (char )(pHdr + 1);
964	size_t cchText = RTStrNLen(pchText, pHdr->cbText);
965	if (offDst + cchText < cbBuf)
966	{
967	memcpy(&pszBuf[offDst], pHdr + 1, cchText);
968	pszBuf[offDst + cchText] = '\n';
969	}
970	else if (offDst < cbBuf)
971	memcpy(&pszBuf[offDst], pHdr + 1, cbBuf - offDst);
972	offDst += cchText + 1;
973	}
974
975	/* next */
976	offCur += pHdr->cbTotal;
977	cbLeft -= pHdr->cbTotal;
978	}
979
980	/* Done with the buffer. */
981	RTMemFree(pbLogBuf);
982
983	/* Make sure we've reserved a char for the terminator. */
984	if (!offDst)
985	offDst = 1;
986
987	/* Set return size value. */
988	if (pcbActual)
989	*pcbActual = offDst;
990
991	if (offDst <= cbBuf)
992	return VINF_SUCCESS;
993	else
994	return VERR_BUFFER_OVERFLOW;
995	}
996
997	/**
998	* @interface_method_impl{DBGFOSIDMESG,pfnQueryKernelLog}
999	*/
1000	static DECLCALLBACK(int) dbgDiggerLinuxIDmsg_QueryKernelLog(PDBGFOSIDMESG pThis, PUVM pUVM, uint32_t fFlags, uint32_t cMessages,
1001	char pszBuf, size_t cbBuf, size_t pcbActual)
1002	{
1003	PDBGDIGGERLINUX pData = RT_FROM_MEMBER(pThis, DBGDIGGERLINUX, IDmesg);
1004
1005	if (cMessages < 1)
1006	return VERR_INVALID_PARAMETER;
1007
1008	/*
1009	* Resolve the symbols we need and read their values.
1010	*/
1011	RTDBGAS hAs = DBGFR3AsResolveAndRetain(pUVM, DBGF_AS_KERNEL);
1012	RTDBGMOD hMod;
1013	int rc = RTDbgAsModuleByName(hAs, "vmlinux", 0, &hMod);
1014	if (RT_FAILURE(rc))
1015	return VERR_NOT_FOUND;
1016	RTDbgAsRelease(hAs);
1017
1018	size_t cbActual;
1019	/*
1020	* Check whether the kernel log buffer is a simple char buffer or the newer
1021	* record based implementation.
1022	* The record based implementation was presumably introduced with kernel 3.4,
1023	* see: http://thread.gmane.org/gmane.linux.kernel/1284184
1024	*/
1025	if (dbgDiggerLinuxLogBufferIsAsciiBuffer(pData, pUVM))
1026	rc = dbgDiggerLinuxLogBufferQueryAscii(pData, pUVM, hMod, fFlags, cMessages, pszBuf, cbBuf, &cbActual);
1027	else
1028	rc = dbgDiggerLinuxLogBufferQueryRecords(pData, pUVM, hMod, fFlags, cMessages, pszBuf, cbBuf, &cbActual);
1029
1030	/* Release the module in any case. */
1031	RTDbgModRelease(hMod);
1032
1033	if (RT_FAILURE(rc) && rc != VERR_BUFFER_OVERFLOW)
1034	return rc;
1035
1036	if (pcbActual)
1037	*pcbActual = cbActual;
1038
1039	/*
1040	* All VBox strings are UTF-8 and bad things may in theory happen if we
1041	* pass bad UTF-8 to code which assumes it's all valid. So, we enforce
1042	* UTF-8 upon the guest kernel messages here even if they (probably) have
1043	* no defined code set in reality.
1044	*/
1045	if ( RT_SUCCESS(rc)
1046	&& cbActual <= cbBuf)
1047	{
1048	pszBuf[cbActual - 1] = '\0';
1049	RTStrPurgeEncoding(pszBuf);
1050	return VINF_SUCCESS;
1051	}
1052
1053	if (cbBuf)
1054	{
1055	pszBuf[cbBuf - 1] = '\0';
1056	RTStrPurgeEncoding(pszBuf);
1057	}
1058	return VERR_BUFFER_OVERFLOW;
1059	}
1060
1061
1062	/**
1063	* Worker destroying the config database.
1064	*/
1065	static DECLCALLBACK(int) dbgDiggerLinuxCfgDbDestroyWorker(PRTSTRSPACECORE pStr, void *pvUser)
1066	{
1067	PDBGDIGGERLINUXCFGITEM pCfgItem = (PDBGDIGGERLINUXCFGITEM)pStr;
1068	RTStrFree((char *)pCfgItem->Core.pszString);
1069	RTMemFree(pCfgItem);
1070	NOREF(pvUser);
1071	return 0;
1072	}
1073
1074
1075	/**
1076	* Destroy the config database.
1077	*
1078	* @returns nothing.
1079	* @param pThis The Linux digger data.
1080	*/
1081	static void dbgDiggerLinuxCfgDbDestroy(PDBGDIGGERLINUX pThis)
1082	{
1083	RTStrSpaceDestroy(&pThis->hCfgDb, dbgDiggerLinuxCfgDbDestroyWorker, NULL);
1084	}
1085
1086
1087	/**
1088	* @copydoc DBGFOSREG::pfnStackUnwindAssist
1089	*/
1090	static DECLCALLBACK(int) dbgDiggerLinuxStackUnwindAssist(PUVM pUVM, void *pvData, VMCPUID idCpu, PDBGFSTACKFRAME pFrame,
1091	PRTDBGUNWINDSTATE pState, PCCPUMCTX pInitialCtx, RTDBGAS hAs,
1092	uint64_t *puScratch)
1093	{
1094	RT_NOREF(pUVM, pvData, idCpu, pFrame, pState, pInitialCtx, hAs, puScratch);
1095	return VINF_SUCCESS;
1096	}
1097
1098
1099	/**
1100	* @copydoc DBGFOSREG::pfnQueryInterface
1101	*/
1102	static DECLCALLBACK(void ) dbgDiggerLinuxQueryInterface(PUVM pUVM, void pvData, DBGFOSINTERFACE enmIf)
1103	{
1104	RT_NOREF1(pUVM);
1105	PDBGDIGGERLINUX pThis = (PDBGDIGGERLINUX)pvData;
1106	switch (enmIf)
1107	{
1108	case DBGFOSINTERFACE_DMESG:
1109	return &pThis->IDmesg;
1110
1111	default:
1112	return NULL;
1113	}
1114	}
1115
1116
1117	/**
1118	* @copydoc DBGFOSREG::pfnQueryVersion
1119	*/
1120	static DECLCALLBACK(int) dbgDiggerLinuxQueryVersion(PUVM pUVM, void pvData, char pszVersion, size_t cchVersion)
1121	{
1122	PDBGDIGGERLINUX pThis = (PDBGDIGGERLINUX)pvData;
1123	Assert(pThis->fValid);
1124
1125	/*
1126	* It's all in the linux banner.
1127	*/
1128	int rc = DBGFR3MemReadString(pUVM, 0, &pThis->AddrLinuxBanner, pszVersion, cchVersion);
1129	if (RT_SUCCESS(rc))
1130	{
1131	char *pszEnd = RTStrEnd(pszVersion, cchVersion);
1132	AssertReturn(pszEnd, VERR_BUFFER_OVERFLOW);
1133	while ( pszEnd > pszVersion
1134	&& RT_C_IS_SPACE(pszEnd[-1]))
1135	pszEnd--;
1136	*pszEnd = '\0';
1137	}
1138	else
1139	RTStrPrintf(pszVersion, cchVersion, "DBGFR3MemRead -> %Rrc", rc);
1140
1141	return rc;
1142	}
1143
1144
1145	/**
1146	* @copydoc DBGFOSREG::pfnTerm
1147	*/
1148	static DECLCALLBACK(void) dbgDiggerLinuxTerm(PUVM pUVM, void *pvData)
1149	{
1150	RT_NOREF1(pUVM);
1151	PDBGDIGGERLINUX pThis = (PDBGDIGGERLINUX)pvData;
1152	Assert(pThis->fValid);
1153
1154	dbgDiggerLinuxCfgDbDestroy(pThis);
1155	pThis->fValid = false;
1156	}
1157
1158
1159	/**
1160	* @copydoc DBGFOSREG::pfnRefresh
1161	*/
1162	static DECLCALLBACK(int) dbgDiggerLinuxRefresh(PUVM pUVM, void *pvData)
1163	{
1164	PDBGDIGGERLINUX pThis = (PDBGDIGGERLINUX)pvData;
1165	NOREF(pThis);
1166	Assert(pThis->fValid);
1167
1168	/*
1169	* For now we'll flush and reload everything.
1170	*/
1171	dbgDiggerLinuxTerm(pUVM, pvData);
1172	return dbgDiggerLinuxInit(pUVM, pvData);
1173	}
1174
1175
1176	/**
1177	* Worker for dbgDiggerLinuxFindStartOfNamesAndSymbolCount that update the
1178	* digger data.
1179	*
1180	* @returns VINF_SUCCESS.
1181	* @param pThis The Linux digger data to update.
1182	* @param pAddrKernelNames The kallsyms_names address.
1183	* @param cKernelSymbols The number of kernel symbol.
1184	* @param cbAddress The guest address size.
1185	*/
1186	static int dbgDiggerLinuxFoundStartOfNames(PDBGDIGGERLINUX pThis, PCDBGFADDRESS pAddrKernelNames,
1187	uint32_t cKernelSymbols, uint32_t cbAddress)
1188	{
1189	pThis->cKernelSymbols = cKernelSymbols;
1190	pThis->AddrKernelNames = *pAddrKernelNames;
1191	pThis->AddrKernelAddresses = *pAddrKernelNames;
1192	uint32_t cbSymbolsSkip = (pThis->fRelKrnlAddr ? 2 : 1) * cbAddress; /* Relative addressing introduces kallsyms_relative_base. */
1193	uint32_t cbOffsets = pThis->fRelKrnlAddr ? sizeof(int32_t) : cbAddress; /* Offsets are always 32bits wide for relative addressing. */
1194	uint32_t cbAlign = 0;
1195
1196	/*
1197	* If the number of symbols is odd there is padding to align the following guest pointer
1198	* sized data properly on 64bit systems with relative addressing.
1199	*/
1200	if ( pThis->fRelKrnlAddr
1201	&& pThis->f64Bit
1202	&& (pThis->cKernelSymbols & 1))
1203	cbAlign = sizeof(int32_t);
1204	DBGFR3AddrSub(&pThis->AddrKernelAddresses, cKernelSymbols * cbOffsets + cbSymbolsSkip + cbAlign);
1205
1206	Log(("dbgDiggerLinuxFoundStartOfNames: AddrKernelAddresses=%RGv\n"
1207	"dbgDiggerLinuxFoundStartOfNames: cKernelSymbols=%#x (at %RGv)\n"
1208	"dbgDiggerLinuxFoundStartOfNames: AddrKernelName=%RGv\n",
1209	pThis->AddrKernelAddresses.FlatPtr,
1210	pThis->cKernelSymbols, pThis->AddrKernelNames.FlatPtr - cbAddress,
1211	pThis->AddrKernelNames.FlatPtr));
1212	return VINF_SUCCESS;
1213	}
1214
1215
1216	/**
1217	* Tries to find the address of the kallsyms_names, kallsyms_num_syms and
1218	* kallsyms_addresses symbols.
1219	*
1220	* The kallsyms_num_syms is read and stored in pThis->cKernelSymbols, while the
1221	* addresses of the other two are stored as pThis->AddrKernelNames and
1222	* pThis->AddrKernelAddresses.
1223	*
1224	* @returns VBox status code, success indicating that all three variables have
1225	* been found and taken down.
1226	* @param pUVM The user mode VM handle.
1227	* @param pThis The Linux digger data.
1228	* @param pHitAddr An address we think is inside kallsyms_names.
1229	*/
1230	static int dbgDiggerLinuxFindStartOfNamesAndSymbolCount(PUVM pUVM, PDBGDIGGERLINUX pThis, PCDBGFADDRESS pHitAddr)
1231	{
1232	/*
1233	* Search backwards in chunks.
1234	*/
1235	union
1236	{
1237	uint8_t ab[0x1000];
1238	uint32_t au32[0x1000 / sizeof(uint32_t)];
1239	uint64_t au64[0x1000 / sizeof(uint64_t)];
1240	} uBuf;
1241	uint32_t cbLeft = LNX_MAX_KALLSYMS_NAMES_SIZE;
1242	uint32_t cbBuf = pHitAddr->FlatPtr & (sizeof(uBuf) - 1);
1243	DBGFADDRESS CurAddr = *pHitAddr;
1244	DBGFR3AddrSub(&CurAddr, cbBuf);
1245	cbBuf += sizeof(uint64_t) - 1; /* In case our kobj hit is in the first 4/8 bytes. */
1246	for (;;)
1247	{
1248	int rc = DBGFR3MemRead(pUVM, 0 /idCpu/, &CurAddr, &uBuf, sizeof(uBuf));
1249	if (RT_FAILURE(rc))
1250	return rc;
1251
1252	/*
1253	* Since Linux 4.6 there are two different methods to store the kallsyms addresses
1254	* in the image.
1255	*
1256	* The first and longer existing method is to store the absolute addresses in an
1257	* array starting at kallsyms_addresses followed by a field which stores the number
1258	* of kernel symbols called kallsyms_num_syms.
1259	* The newer method is to use offsets stored in kallsyms_offsets and have a base pointer
1260	* to relate the offsets to called kallsyms_relative_base. One entry in kallsyms_offsets is
1261	* always 32bit wide regardless of the guest pointer size (this halves the table on 64bit
1262	* systems) but means more work for us for the 64bit case.
1263	*
1264	* When absolute addresses are used the following assumptions hold:
1265	*
1266	* We assume that the three symbols are aligned on guest pointer boundary.
1267	*
1268	* The boundary between the two tables should be noticable as the number
1269	* is unlikely to be more than 16 millions, there will be at least one zero
1270	* byte where it is, 64-bit will have 5 zero bytes. Zero bytes aren't all
1271	* that common in the kallsyms_names table.
1272	*
1273	* Also the kallsyms_names table starts with a length byte, which means
1274	* we're likely to see a byte in the range 1..31.
1275	*
1276	* The kallsyms_addresses are mostly sorted (except for the start where the
1277	* absolute symbols are), so we'll spot a bunch of kernel addresses
1278	* immediately preceeding the kallsyms_num_syms field.
1279	*
1280	* Lazy bird: If kallsyms_num_syms is on a buffer boundrary, we skip
1281	* the check for kernel addresses preceeding it.
1282	*
1283	* For relative offsets most of the assumptions from above are true too
1284	* except that we have to distinguish between the relative base address and the offsets.
1285	* Every observed kernel has a valid kernel address fo the relative base and kallsyms_relative_base
1286	* always comes before kallsyms_num_syms and is aligned on a guest pointer boundary.
1287	* Offsets are stored before kallsyms_relative_base and don't contain valid kernel addresses.
1288	*
1289	* To distinguish between absolute and relative offsetting we check the data before a candidate
1290	* for kallsyms_num_syms. If all entries before the kallsyms_num_syms candidate are valid kernel
1291	* addresses absolute addresses are assumed. If this is not the case but the first entry before
1292	* kallsyms_num_syms is a valid kernel address we check whether the data before and the possible
1293	* relative base form a valid kernel address and assume relative offsets.
1294	*/
1295	if (pThis->f64Bit)
1296	{
1297	uint32_t i = cbBuf / sizeof(uint64_t);
1298	while (i-- > 0)
1299	if ( uBuf.au64[i] <= LNX_MAX_KALLSYMS_SYMBOLS
1300	&& uBuf.au64[i] >= LNX_MIN_KALLSYMS_SYMBOLS)
1301	{
1302	uint8_t pb = (uint8_t )&uBuf.au64[i + 1];
1303	if ( pb[0] <= LNX_MAX_KALLSYMS_ENC_LENGTH
1304	&& pb[0] >= LNX_MIN_KALLSYMS_ENC_LENGTH)
1305	{
1306	/*
1307	* Check whether we have a valid kernel address and try to distinguish
1308	* whether the kernel uses relative offsetting or absolute addresses.
1309	*/
1310	if ( (i >= 1 && LNX64_VALID_ADDRESS(uBuf.au64[i - 1]))
1311	&& (i >= 2 && !LNX64_VALID_ADDRESS(uBuf.au64[i - 2]))
1312	&& (i >= 3 && !LNX64_VALID_ADDRESS(uBuf.au64[i - 3])))
1313	{
1314	RTGCUINTPTR uKrnlRelBase = uBuf.au64[i - 1];
1315	DBGFADDRESS RelAddr = CurAddr;
1316	int32_t aiRelOff[3];
1317	rc = DBGFR3MemRead(pUVM, 0 /idCpu/, DBGFR3AddrAdd(&RelAddr, (i - 1) * sizeof(uint64_t) - sizeof(aiRelOff)),
1318	&aiRelOff[0], sizeof(aiRelOff));
1319	if ( RT_SUCCESS(rc)
1320	&& LNX64_VALID_ADDRESS(uKrnlRelBase + aiRelOff[0])
1321	&& LNX64_VALID_ADDRESS(uKrnlRelBase + aiRelOff[1])
1322	&& LNX64_VALID_ADDRESS(uKrnlRelBase + aiRelOff[2]))
1323	{
1324	Log(("dbgDiggerLinuxFindStartOfNamesAndSymbolCount: relative base %RGv (at %RGv)\n",
1325	uKrnlRelBase, CurAddr.FlatPtr + (i - 1) * sizeof(uint64_t)));
1326	pThis->fRelKrnlAddr = true;
1327	pThis->uKernelRelativeBase = uKrnlRelBase;
1328	return dbgDiggerLinuxFoundStartOfNames(pThis,
1329	DBGFR3AddrAdd(&CurAddr, (i + 1) * sizeof(uint64_t)),
1330	(uint32_t)uBuf.au64[i], sizeof(uint64_t));
1331	}
1332	}
1333
1334	if ( (i <= 0 \|\| LNX64_VALID_ADDRESS(uBuf.au64[i - 1]))
1335	&& (i <= 1 \|\| LNX64_VALID_ADDRESS(uBuf.au64[i - 2]))
1336	&& (i <= 2 \|\| LNX64_VALID_ADDRESS(uBuf.au64[i - 3])))
1337	return dbgDiggerLinuxFoundStartOfNames(pThis,
1338	DBGFR3AddrAdd(&CurAddr, (i + 1) * sizeof(uint64_t)),
1339	(uint32_t)uBuf.au64[i], sizeof(uint64_t));
1340	}
1341	}
1342	}
1343	else
1344	{
1345	uint32_t i = cbBuf / sizeof(uint32_t);
1346	while (i-- > 0)
1347	if ( uBuf.au32[i] <= LNX_MAX_KALLSYMS_SYMBOLS
1348	&& uBuf.au32[i] >= LNX_MIN_KALLSYMS_SYMBOLS)
1349	{
1350	uint8_t pb = (uint8_t )&uBuf.au32[i + 1];
1351	if ( pb[0] <= LNX_MAX_KALLSYMS_ENC_LENGTH
1352	&& pb[0] >= LNX_MIN_KALLSYMS_ENC_LENGTH)
1353	{
1354	/* Check for relative base addressing. */
1355	if (i >= 1 && LNX32_VALID_ADDRESS(uBuf.au32[i - 1]))
1356	{
1357	RTGCUINTPTR uKrnlRelBase = uBuf.au32[i - 1];
1358	if ( (i <= 1 \|\| LNX32_VALID_ADDRESS(uKrnlRelBase + uBuf.au32[i - 2]))
1359	&& (i <= 2 \|\| LNX32_VALID_ADDRESS(uKrnlRelBase + uBuf.au32[i - 3])))
1360	{
1361	Log(("dbgDiggerLinuxFindStartOfNamesAndSymbolCount: relative base %RGv (at %RGv)\n",
1362	uKrnlRelBase, CurAddr.FlatPtr + (i - 1) * sizeof(uint32_t)));
1363	pThis->fRelKrnlAddr = true;
1364	pThis->uKernelRelativeBase = uKrnlRelBase;
1365	return dbgDiggerLinuxFoundStartOfNames(pThis,
1366	DBGFR3AddrAdd(&CurAddr, (i + 1) * sizeof(uint32_t)),
1367	uBuf.au32[i], sizeof(uint32_t));
1368	}
1369	}
1370
1371	if ( (i <= 0 \|\| LNX32_VALID_ADDRESS(uBuf.au32[i - 1]))
1372	&& (i <= 1 \|\| LNX32_VALID_ADDRESS(uBuf.au32[i - 2]))
1373	&& (i <= 2 \|\| LNX32_VALID_ADDRESS(uBuf.au32[i - 3])))
1374	return dbgDiggerLinuxFoundStartOfNames(pThis,
1375	DBGFR3AddrAdd(&CurAddr, (i + 1) * sizeof(uint32_t)),
1376	uBuf.au32[i], sizeof(uint32_t));
1377	}
1378	}
1379	}
1380
1381	/*
1382	* Advance
1383	*/
1384	if (RT_UNLIKELY(cbLeft <= sizeof(uBuf)))
1385	{
1386	Log(("dbgDiggerLinuxFindStartOfNamesAndSymbolCount: failed (pHitAddr=%RGv)\n", pHitAddr->FlatPtr));
1387	return VERR_NOT_FOUND;
1388	}
1389	cbLeft -= sizeof(uBuf);
1390	DBGFR3AddrSub(&CurAddr, sizeof(uBuf));
1391	cbBuf = sizeof(uBuf);
1392	}
1393	}
1394
1395
1396	/**
1397	* Worker for dbgDiggerLinuxFindEndNames that records the findings.
1398	*
1399	* @returns VINF_SUCCESS
1400	* @param pThis The linux digger data to update.
1401	* @param pAddrMarkers The address of the marker (kallsyms_markers).
1402	* @param cbMarkerEntry The size of a marker entry (32-bit or 64-bit).
1403	*/
1404	static int dbgDiggerLinuxFoundMarkers(PDBGDIGGERLINUX pThis, PCDBGFADDRESS pAddrMarkers, uint32_t cbMarkerEntry)
1405	{
1406	pThis->cbKernelNames = pAddrMarkers->FlatPtr - pThis->AddrKernelNames.FlatPtr;
1407	pThis->AddrKernelNameMarkers = *pAddrMarkers;
1408	pThis->cKernelNameMarkers = RT_ALIGN_32(pThis->cKernelSymbols, 256) / 256;
1409	pThis->AddrKernelTokenTable = *pAddrMarkers;
1410	DBGFR3AddrAdd(&pThis->AddrKernelTokenTable, pThis->cKernelNameMarkers * cbMarkerEntry);
1411
1412	Log(("dbgDiggerLinuxFoundMarkers: AddrKernelNames=%RGv cbKernelNames=%#x\n"
1413	"dbgDiggerLinuxFoundMarkers: AddrKernelNameMarkers=%RGv cKernelNameMarkers=%#x\n"
1414	"dbgDiggerLinuxFoundMarkers: AddrKernelTokenTable=%RGv\n",
1415	pThis->AddrKernelNames.FlatPtr, pThis->cbKernelNames,
1416	pThis->AddrKernelNameMarkers.FlatPtr, pThis->cKernelNameMarkers,
1417	pThis->AddrKernelTokenTable.FlatPtr));
1418	return VINF_SUCCESS;
1419	}
1420
1421
1422	/**
1423	* Tries to find the end of kallsyms_names and thereby the start of
1424	* kallsyms_markers and kallsyms_token_table.
1425	*
1426	* The kallsyms_names size is stored in pThis->cbKernelNames, the addresses of
1427	* the two other symbols in pThis->AddrKernelNameMarkers and
1428	* pThis->AddrKernelTokenTable. The number of marker entries is stored in
1429	* pThis->cKernelNameMarkers.
1430	*
1431	* @returns VBox status code, success indicating that all three variables have
1432	* been found and taken down.
1433	* @param pUVM The user mode VM handle.
1434	* @param pThis The Linux digger data.
1435	* @param pHitAddr An address we think is inside kallsyms_names.
1436	*/
1437	static int dbgDiggerLinuxFindEndOfNamesAndMore(PUVM pUVM, PDBGDIGGERLINUX pThis, PCDBGFADDRESS pHitAddr)
1438	{
1439	/*
1440	* Search forward in chunks.
1441	*/
1442	union
1443	{
1444	uint8_t ab[0x1000];
1445	uint32_t au32[0x1000 / sizeof(uint32_t)];
1446	uint64_t au64[0x1000 / sizeof(uint64_t)];
1447	} uBuf;
1448	bool fPendingZeroHit = false;
1449	uint32_t cbLeft = LNX_MAX_KALLSYMS_NAMES_SIZE + sizeof(uBuf);
1450	uint32_t offBuf = pHitAddr->FlatPtr & (sizeof(uBuf) - 1);
1451	DBGFADDRESS CurAddr = *pHitAddr;
1452	DBGFR3AddrSub(&CurAddr, offBuf);
1453	for (;;)
1454	{
1455	int rc = DBGFR3MemRead(pUVM, 0 /idCpu/, &CurAddr, &uBuf, sizeof(uBuf));
1456	if (RT_FAILURE(rc))
1457	return rc;
1458
1459	/*
1460	* The kallsyms_names table is followed by kallsyms_markers we assume,
1461	* using sizeof(unsigned long) alignment like the preceeding symbols.
1462	*
1463	* The kallsyms_markers table has entried sizeof(unsigned long) and
1464	* contains offsets into kallsyms_names. The kallsyms_markers used to
1465	* index kallsyms_names and reduce seek time when looking up the name
1466	* of an address/symbol. Each entry in kallsyms_markers covers 256
1467	* symbol names.
1468	*
1469	* Because of this, the first entry is always zero and all the entries
1470	* are ascending. It also follows that the size of the table can be
1471	* calculated from kallsyms_num_syms.
1472	*
1473	* Note! We could also have walked kallsyms_names by skipping
1474	* kallsyms_num_syms names, but this is faster and we will
1475	* validate the encoded names later.
1476	*/
1477	if (pThis->f64Bit)
1478	{
1479	if ( RT_UNLIKELY(fPendingZeroHit)
1480	&& uBuf.au64[0] >= (LNX_MIN_KALLSYMS_ENC_LENGTH + 1) * 256
1481	&& uBuf.au64[0] <= (LNX_MAX_KALLSYMS_ENC_LENGTH + 1) * 256)
1482	return dbgDiggerLinuxFoundMarkers(pThis, DBGFR3AddrSub(&CurAddr, sizeof(uint64_t)), sizeof(uint64_t));
1483
1484	uint32_t const cEntries = sizeof(uBuf) / sizeof(uint64_t);
1485	for (uint32_t i = offBuf / sizeof(uint64_t); i < cEntries; i++)
1486	if (uBuf.au64[i] == 0)
1487	{
1488	if (RT_UNLIKELY(i + 1 >= cEntries))
1489	{
1490	fPendingZeroHit = true;
1491	break;
1492	}
1493	if ( uBuf.au64[i + 1] >= (LNX_MIN_KALLSYMS_ENC_LENGTH + 1) * 256
1494	&& uBuf.au64[i + 1] <= (LNX_MAX_KALLSYMS_ENC_LENGTH + 1) * 256)
1495	return dbgDiggerLinuxFoundMarkers(pThis, DBGFR3AddrAdd(&CurAddr, i * sizeof(uint64_t)), sizeof(uint64_t));
1496	}
1497	}
1498	else
1499	{
1500	if ( RT_UNLIKELY(fPendingZeroHit)
1501	&& uBuf.au32[0] >= (LNX_MIN_KALLSYMS_ENC_LENGTH + 1) * 256
1502	&& uBuf.au32[0] <= (LNX_MAX_KALLSYMS_ENC_LENGTH + 1) * 256)
1503	return dbgDiggerLinuxFoundMarkers(pThis, DBGFR3AddrSub(&CurAddr, sizeof(uint32_t)), sizeof(uint32_t));
1504
1505	uint32_t const cEntries = sizeof(uBuf) / sizeof(uint32_t);
1506	for (uint32_t i = offBuf / sizeof(uint32_t); i < cEntries; i++)
1507	if (uBuf.au32[i] == 0)
1508	{
1509	if (RT_UNLIKELY(i + 1 >= cEntries))
1510	{
1511	fPendingZeroHit = true;
1512	break;
1513	}
1514	if ( uBuf.au32[i + 1] >= (LNX_MIN_KALLSYMS_ENC_LENGTH + 1) * 256
1515	&& uBuf.au32[i + 1] <= (LNX_MAX_KALLSYMS_ENC_LENGTH + 1) * 256)
1516	return dbgDiggerLinuxFoundMarkers(pThis, DBGFR3AddrAdd(&CurAddr, i * sizeof(uint32_t)), sizeof(uint32_t));
1517	}
1518	}
1519
1520	/*
1521	* Advance
1522	*/
1523	if (RT_UNLIKELY(cbLeft <= sizeof(uBuf)))
1524	{
1525	Log(("dbgDiggerLinuxFindEndOfNamesAndMore: failed (pHitAddr=%RGv)\n", pHitAddr->FlatPtr));
1526	return VERR_NOT_FOUND;
1527	}
1528	cbLeft -= sizeof(uBuf);
1529	DBGFR3AddrAdd(&CurAddr, sizeof(uBuf));
1530	offBuf = 0;
1531	}
1532	}
1533
1534
1535	/**
1536	* Locates the kallsyms_token_index table.
1537	*
1538	* Storing the address in pThis->AddrKernelTokenIndex and the size of the token
1539	* table in pThis->cbKernelTokenTable.
1540	*
1541	* @returns VBox status code.
1542	* @param pUVM The user mode VM handle.
1543	* @param pThis The Linux digger data.
1544	*/
1545	static int dbgDiggerLinuxFindTokenIndex(PUVM pUVM, PDBGDIGGERLINUX pThis)
1546	{
1547	/*
1548	* The kallsyms_token_table is very much like a string table. Due to the
1549	* nature of the compression algorithm it is reasonably short (one example
1550	* here is 853 bytes), so we'll not be reading it in chunks but in full.
1551	* To be on the safe side, we read 8KB, ASSUMING we won't run into unmapped
1552	* memory or any other nasty stuff...
1553	*/
1554	union
1555	{
1556	uint8_t ab[0x2000];
1557	uint16_t au16[0x2000 / sizeof(uint16_t)];
1558	} uBuf;
1559	DBGFADDRESS CurAddr = pThis->AddrKernelTokenTable;
1560	int rc = DBGFR3MemRead(pUVM, 0 /idCpu/, &CurAddr, &uBuf, sizeof(uBuf));
1561	if (RT_FAILURE(rc))
1562	return rc;
1563
1564	/*
1565	* We've got two choices here, either walk the string table or look for
1566	* the next structure, kallsyms_token_index.
1567	*
1568	* The token index is a table of 256 uint16_t entries (index by bytes
1569	* from kallsyms_names) that gives offsets in kallsyms_token_table. It
1570	* starts with a zero entry and the following entries are sorted in
1571	* ascending order. The range of the entries are reasonably small since
1572	* kallsyms_token_table is small.
1573	*
1574	* The alignment seems to be sizeof(unsigned long), just like
1575	* kallsyms_token_table.
1576	*
1577	* So, we start by looking for a zero 16-bit entry.
1578	*/
1579	uint32_t cIncr = (pThis->f64Bit ? sizeof(uint64_t) : sizeof(uint32_t)) / sizeof(uint16_t);
1580
1581	for (uint32_t i = 0; i < sizeof(uBuf) / sizeof(uint16_t) - 16; i += cIncr)
1582	if ( uBuf.au16[i] == 0
1583	&& uBuf.au16[i + 1] > 0
1584	&& uBuf.au16[i + 1] <= LNX_MAX_KALLSYMS_TOKEN_LEN
1585	&& (uint16_t)(uBuf.au16[i + 2] - uBuf.au16[i + 1] - 1U) <= (uint16_t)LNX_MAX_KALLSYMS_TOKEN_LEN
1586	&& (uint16_t)(uBuf.au16[i + 3] - uBuf.au16[i + 2] - 1U) <= (uint16_t)LNX_MAX_KALLSYMS_TOKEN_LEN
1587	&& (uint16_t)(uBuf.au16[i + 4] - uBuf.au16[i + 3] - 1U) <= (uint16_t)LNX_MAX_KALLSYMS_TOKEN_LEN
1588	&& (uint16_t)(uBuf.au16[i + 5] - uBuf.au16[i + 4] - 1U) <= (uint16_t)LNX_MAX_KALLSYMS_TOKEN_LEN
1589	&& (uint16_t)(uBuf.au16[i + 6] - uBuf.au16[i + 5] - 1U) <= (uint16_t)LNX_MAX_KALLSYMS_TOKEN_LEN
1590	)
1591	{
1592	pThis->AddrKernelTokenIndex = CurAddr;
1593	DBGFR3AddrAdd(&pThis->AddrKernelTokenIndex, i * sizeof(uint16_t));
1594	pThis->cbKernelTokenTable = i * sizeof(uint16_t);
1595	return VINF_SUCCESS;
1596	}
1597
1598	Log(("dbgDiggerLinuxFindTokenIndex: Failed (%RGv..%RGv)\n", CurAddr.FlatPtr, CurAddr.FlatPtr + (RTGCUINTPTR)sizeof(uBuf)));
1599	return VERR_NOT_FOUND;
1600	}
1601
1602
1603	/**
1604	* Loads the kernel symbols from the given kallsyms offset table decoding the symbol names
1605	* (worker common for dbgDiggerLinuxLoadKernelSymbolsAbsolute() and dbgDiggerLinuxLoadKernelSymbolsRelative()).
1606	*
1607	* @returns VBox status code.
1608	* @param pUVM The user mode VM handle.
1609	* @param pThis The Linux digger data.
1610	* @param uKernelStart Flat kernel start address.
1611	* @param cbKernel Size of the kernel in bytes.
1612	* @param pauSymOff Pointer to the array of symbol offsets in the kallsyms table
1613	* relative to the start of the kernel.
1614	*/
1615	static int dbgDiggerLinuxLoadKernelSymbolsWorker(PUVM pUVM, PDBGDIGGERLINUX pThis, RTGCUINTPTR uKernelStart,
1616	RTGCUINTPTR cbKernel, RTGCUINTPTR *pauSymOff)
1617	{
1618	uint8_t pbNames = (uint8_t )RTMemAllocZ(pThis->cbKernelNames);
1619	int rc = DBGFR3MemRead(pUVM, 0 /idCpu/, &pThis->AddrKernelNames, pbNames, pThis->cbKernelNames);
1620	if (RT_SUCCESS(rc))
1621	{
1622	char pszzTokens = (char )RTMemAllocZ(pThis->cbKernelTokenTable);
1623	rc = DBGFR3MemRead(pUVM, 0 /idCpu/, &pThis->AddrKernelTokenTable, pszzTokens, pThis->cbKernelTokenTable);
1624	if (RT_SUCCESS(rc))
1625	{
1626	uint16_t paoffTokens = (uint16_t )RTMemAllocZ(256 * sizeof(uint16_t));
1627	rc = DBGFR3MemRead(pUVM, 0 /idCpu/, &pThis->AddrKernelTokenIndex, paoffTokens, 256 * sizeof(uint16_t));
1628	if (RT_SUCCESS(rc))
1629	{
1630	/*
1631	* Create a module for the kernel.
1632	*/
1633	RTDBGMOD hMod;
1634	rc = RTDbgModCreate(&hMod, "vmlinux", cbKernel, 0 /fFlags/);
1635	if (RT_SUCCESS(rc))
1636	{
1637	rc = RTDbgModSetTag(hMod, DIG_LNX_MOD_TAG); AssertRC(rc);
1638	rc = VINF_SUCCESS;
1639
1640	/*
1641	* Enumerate the symbols.
1642	*/
1643	uint32_t offName = 0;
1644	uint32_t cLeft = pThis->cKernelSymbols;
1645	while (cLeft-- > 0 && RT_SUCCESS(rc))
1646	{
1647	/* Decode the symbol name first. */
1648	if (RT_LIKELY(offName < pThis->cbKernelNames))
1649	{
1650	uint8_t cbName = pbNames[offName++];
1651	if (RT_LIKELY(offName + cbName <= pThis->cbKernelNames))
1652	{
1653	char szSymbol[4096];
1654	uint32_t offSymbol = 0;
1655	while (cbName-- > 0)
1656	{
1657	uint8_t bEnc = pbNames[offName++];
1658	uint16_t offToken = paoffTokens[bEnc];
1659	if (RT_LIKELY(offToken < pThis->cbKernelTokenTable))
1660	{
1661	const char *pszToken = &pszzTokens[offToken];
1662	char ch;
1663	while ((ch = *pszToken++) != '\0')
1664	if (offSymbol < sizeof(szSymbol) - 1)
1665	szSymbol[offSymbol++] = ch;
1666	}
1667	else
1668	{
1669	rc = VERR_INVALID_UTF8_ENCODING;
1670	break;
1671	}
1672	}
1673	szSymbol[offSymbol < sizeof(szSymbol) ? offSymbol : sizeof(szSymbol) - 1] = '\0';
1674
1675	/* The offset. */
1676	RTGCUINTPTR uSymOff = *pauSymOff;
1677	pauSymOff++;
1678
1679	/* Add it without the type char. */
1680	if (uSymOff <= cbKernel)
1681	{
1682	rc = RTDbgModSymbolAdd(hMod, &szSymbol[1], RTDBGSEGIDX_RVA, uSymOff,
1683	0 /cb/, 0 /fFlags/, NULL);
1684	if (RT_FAILURE(rc))
1685	{
1686	if ( rc == VERR_DBG_SYMBOL_NAME_OUT_OF_RANGE
1687	\|\| rc == VERR_DBG_INVALID_RVA
1688	\|\| rc == VERR_DBG_ADDRESS_CONFLICT
1689	\|\| rc == VERR_DBG_DUPLICATE_SYMBOL)
1690	{
1691	Log2(("dbgDiggerLinuxLoadKernelSymbols: RTDbgModSymbolAdd(,%s,) failed %Rrc (ignored)\n", szSymbol, rc));
1692	rc = VINF_SUCCESS;
1693	}
1694	else
1695	Log(("dbgDiggerLinuxLoadKernelSymbols: RTDbgModSymbolAdd(,%s,) failed %Rrc\n", szSymbol, rc));
1696	}
1697	}
1698	}
1699	else
1700	{
1701	rc = VERR_END_OF_STRING;
1702	Log(("dbgDiggerLinuxLoadKernelSymbols: offName=%#x cLeft=%#x cbName=%#x cbKernelNames=%#x\n",
1703	offName, cLeft, cbName, pThis->cbKernelNames));
1704	}
1705	}
1706	else
1707	{
1708	rc = VERR_END_OF_STRING;
1709	Log(("dbgDiggerLinuxLoadKernelSymbols: offName=%#x cLeft=%#x cbKernelNames=%#x\n",
1710	offName, cLeft, pThis->cbKernelNames));
1711	}
1712	}
1713
1714	/*
1715	* Link the module into the address space.
1716	*/
1717	if (RT_SUCCESS(rc))
1718	{
1719	RTDBGAS hAs = DBGFR3AsResolveAndRetain(pUVM, DBGF_AS_KERNEL);
1720	if (hAs != NIL_RTDBGAS)
1721	rc = RTDbgAsModuleLink(hAs, hMod, uKernelStart, RTDBGASLINK_FLAGS_REPLACE);
1722	else
1723	rc = VERR_INTERNAL_ERROR;
1724	RTDbgAsRelease(hAs);
1725	}
1726	else
1727	Log(("dbgDiggerLinuxLoadKernelSymbols: Failed: %Rrc\n", rc));
1728	RTDbgModRelease(hMod);
1729	}
1730	else
1731	Log(("dbgDiggerLinuxLoadKernelSymbols: RTDbgModCreate failed: %Rrc\n", rc));
1732	}
1733	else
1734	Log(("dbgDiggerLinuxLoadKernelSymbols: Reading token index at %RGv failed: %Rrc\n",
1735	pThis->AddrKernelTokenIndex.FlatPtr, rc));
1736	RTMemFree(paoffTokens);
1737	}
1738	else
1739	Log(("dbgDiggerLinuxLoadKernelSymbols: Reading token table at %RGv failed: %Rrc\n",
1740	pThis->AddrKernelTokenTable.FlatPtr, rc));
1741	RTMemFree(pszzTokens);
1742	}
1743	else
1744	Log(("dbgDiggerLinuxLoadKernelSymbols: Reading encoded names at %RGv failed: %Rrc\n",
1745	pThis->AddrKernelNames.FlatPtr, rc));
1746	RTMemFree(pbNames);
1747
1748	return rc;
1749	}
1750
1751	/**
1752	* Loads the kernel symbols from the kallsyms table if it contains absolute addresses
1753	*
1754	* @returns VBox status code.
1755	* @param pUVM The user mode VM handle.
1756	* @param pThis The Linux digger data.
1757	*/
1758	static int dbgDiggerLinuxLoadKernelSymbolsAbsolute(PUVM pUVM, PDBGDIGGERLINUX pThis)
1759	{
1760	/*
1761	* Allocate memory for temporary table copies, reading the tables as we go.
1762	*/
1763	uint32_t const cbGuestAddr = pThis->f64Bit ? sizeof(uint64_t) : sizeof(uint32_t);
1764	void pvAddresses = RTMemAllocZ(pThis->cKernelSymbols cbGuestAddr);
1765	int rc = DBGFR3MemRead(pUVM, 0 /idCpu/, &pThis->AddrKernelAddresses, pvAddresses, pThis->cKernelSymbols * cbGuestAddr);
1766	if (RT_SUCCESS(rc))
1767	{
1768	/*
1769	* Figure out the kernel start and end and convert the absolute addresses to relative offsets.
1770	*/
1771	RTGCUINTPTR uKernelStart = pThis->AddrKernelAddresses.FlatPtr;
1772	RTGCUINTPTR uKernelEnd = pThis->AddrKernelTokenIndex.FlatPtr + 256 * sizeof(uint16_t);
1773	RTGCUINTPTR pauSymOff = (RTGCUINTPTR )RTMemTmpAllocZ(pThis->cKernelSymbols * sizeof(RTGCUINTPTR));
1774	uint32_t i;
1775	if (cbGuestAddr == sizeof(uint64_t))
1776	{
1777	uint64_t pauAddrs = (uint64_t )pvAddresses;
1778	for (i = 0; i < pThis->cKernelSymbols; i++)
1779	if ( pauAddrs[i] < uKernelStart
1780	&& LNX64_VALID_ADDRESS(pauAddrs[i])
1781	&& uKernelStart - pauAddrs[i] < LNX_MAX_KERNEL_SIZE)
1782	uKernelStart = pauAddrs[i];
1783
1784	for (i = pThis->cKernelSymbols - 1; i > 0; i--)
1785	if ( pauAddrs[i] > uKernelEnd
1786	&& LNX64_VALID_ADDRESS(pauAddrs[i])
1787	&& pauAddrs[i] - uKernelEnd < LNX_MAX_KERNEL_SIZE)
1788	uKernelEnd = pauAddrs[i];
1789
1790	for (i = 0; i < pThis->cKernelSymbols; i++)
1791	pauSymOff[i] = pauAddrs[i] - uKernelStart;
1792	}
1793	else
1794	{
1795	uint32_t pauAddrs = (uint32_t )pvAddresses;
1796	for (i = 0; i < pThis->cKernelSymbols; i++)
1797	if ( pauAddrs[i] < uKernelStart
1798	&& LNX32_VALID_ADDRESS(pauAddrs[i])
1799	&& uKernelStart - pauAddrs[i] < LNX_MAX_KERNEL_SIZE)
1800	uKernelStart = pauAddrs[i];
1801
1802	for (i = pThis->cKernelSymbols - 1; i > 0; i--)
1803	if ( pauAddrs[i] > uKernelEnd
1804	&& LNX32_VALID_ADDRESS(pauAddrs[i])
1805	&& pauAddrs[i] - uKernelEnd < LNX_MAX_KERNEL_SIZE)
1806	uKernelEnd = pauAddrs[i];
1807
1808	for (i = 0; i < pThis->cKernelSymbols; i++)
1809	pauSymOff[i] = pauAddrs[i] - uKernelStart;
1810	}
1811
1812	RTGCUINTPTR cbKernel = uKernelEnd - uKernelStart;
1813	pThis->cbKernel = (uint32_t)cbKernel;
1814	DBGFR3AddrFromFlat(pUVM, &pThis->AddrKernelBase, uKernelStart);
1815	Log(("dbgDiggerLinuxLoadKernelSymbolsAbsolute: uKernelStart=%RGv cbKernel=%#x\n", uKernelStart, cbKernel));
1816
1817	rc = dbgDiggerLinuxLoadKernelSymbolsWorker(pUVM, pThis, uKernelStart, cbKernel, pauSymOff);
1818	if (RT_FAILURE(rc))
1819	Log(("dbgDiggerLinuxLoadKernelSymbolsAbsolute: Loading symbols from given offset table failed: %Rrc\n", rc));
1820	RTMemTmpFree(pauSymOff);
1821	}
1822	else
1823	Log(("dbgDiggerLinuxLoadKernelSymbolsAbsolute: Reading symbol addresses at %RGv failed: %Rrc\n",
1824	pThis->AddrKernelAddresses.FlatPtr, rc));
1825	RTMemFree(pvAddresses);
1826
1827	return rc;
1828	}
1829
1830
1831	/**
1832	* Loads the kernel symbols from the kallsyms table if it contains absolute addresses
1833	*
1834	* @returns VBox status code.
1835	* @param pUVM The user mode VM handle.
1836	* @param pThis The Linux digger data.
1837	*/
1838	static int dbgDiggerLinuxLoadKernelSymbolsRelative(PUVM pUVM, PDBGDIGGERLINUX pThis)
1839	{
1840	/*
1841	* Allocate memory for temporary table copies, reading the tables as we go.
1842	*/
1843	int32_t pai32Offsets = (int32_t )RTMemAllocZ(pThis->cKernelSymbols * sizeof(int32_t));
1844	int rc = DBGFR3MemRead(pUVM, 0 /idCpu/, &pThis->AddrKernelAddresses, pai32Offsets, pThis->cKernelSymbols * sizeof(int32_t));
1845	if (RT_SUCCESS(rc))
1846	{
1847	/*
1848	* Figure out the kernel start and end and convert the absolute addresses to relative offsets.
1849	*/
1850	RTGCUINTPTR uKernelStart = pThis->AddrKernelAddresses.FlatPtr;
1851	RTGCUINTPTR uKernelEnd = pThis->AddrKernelTokenIndex.FlatPtr + 256 * sizeof(uint16_t);
1852	RTGCUINTPTR pauSymOff = (RTGCUINTPTR )RTMemTmpAllocZ(pThis->cKernelSymbols * sizeof(RTGCUINTPTR));
1853	uint32_t i;
1854
1855	for (i = 0; i < pThis->cKernelSymbols; i++)
1856	{
1857	RTGCUINTPTR uSymAddr = dbgDiggerLinuxConvOffsetToAddr(pThis, pai32Offsets[i]);
1858
1859	if ( uSymAddr < uKernelStart
1860	&& (pThis->f64Bit ? LNX64_VALID_ADDRESS(uSymAddr) : LNX32_VALID_ADDRESS(uSymAddr))
1861	&& uKernelStart - uSymAddr < LNX_MAX_KERNEL_SIZE)
1862	uKernelStart = uSymAddr;
1863	}
1864
1865	for (i = pThis->cKernelSymbols - 1; i > 0; i--)
1866	{
1867	RTGCUINTPTR uSymAddr = dbgDiggerLinuxConvOffsetToAddr(pThis, pai32Offsets[i]);
1868
1869	if ( uSymAddr > uKernelEnd
1870	&& (pThis->f64Bit ? LNX64_VALID_ADDRESS(uSymAddr) : LNX32_VALID_ADDRESS(uSymAddr))
1871	&& uSymAddr - uKernelEnd < LNX_MAX_KERNEL_SIZE)
1872	uKernelEnd = uSymAddr;
1873
1874	/* Store the offset from the derived kernel start address. */
1875	pauSymOff[i] = uSymAddr - uKernelStart;
1876	}
1877
1878	RTGCUINTPTR cbKernel = uKernelEnd - uKernelStart;
1879	pThis->cbKernel = (uint32_t)cbKernel;
1880	DBGFR3AddrFromFlat(pUVM, &pThis->AddrKernelBase, uKernelStart);
1881	Log(("dbgDiggerLinuxLoadKernelSymbolsRelative: uKernelStart=%RGv cbKernel=%#x\n", uKernelStart, cbKernel));
1882
1883	rc = dbgDiggerLinuxLoadKernelSymbolsWorker(pUVM, pThis, uKernelStart, cbKernel, pauSymOff);
1884	if (RT_FAILURE(rc))
1885	Log(("dbgDiggerLinuxLoadKernelSymbolsRelative: Loading symbols from given offset table failed: %Rrc\n", rc));
1886	RTMemTmpFree(pauSymOff);
1887	}
1888	else
1889	Log(("dbgDiggerLinuxLoadKernelSymbolsRelative: Reading symbol addresses at %RGv failed: %Rrc\n",
1890	pThis->AddrKernelAddresses.FlatPtr, rc));
1891	RTMemFree(pai32Offsets);
1892
1893	return rc;
1894	}
1895
1896
1897	/**
1898	* Loads the kernel symbols.
1899	*
1900	* @returns VBox status code.
1901	* @param pUVM The user mode VM handle.
1902	* @param pThis The Linux digger data.
1903	*/
1904	static int dbgDiggerLinuxLoadKernelSymbols(PUVM pUVM, PDBGDIGGERLINUX pThis)
1905	{
1906	if (pThis->fRelKrnlAddr)
1907	return dbgDiggerLinuxLoadKernelSymbolsRelative(pUVM, pThis);
1908	else
1909	return dbgDiggerLinuxLoadKernelSymbolsAbsolute(pUVM, pThis);
1910	}
1911
1912	/**
1913	* Checks if there is a likely kallsyms_names fragment at pHitAddr.
1914	*
1915	* @returns true if it's a likely fragment, false if not.
1916	* @param pUVM The user mode VM handle.
1917	* @param pHitAddr The address where paNeedle was found.
1918	* @param pabNeedle The fragment we've been searching for.
1919	* @param cbNeedle The length of the fragment.
1920	*/
1921	static bool dbgDiggerLinuxIsLikelyNameFragment(PUVM pUVM, PCDBGFADDRESS pHitAddr, uint8_t const *pabNeedle, uint8_t cbNeedle)
1922	{
1923	/*
1924	* Examples of lead and tail bytes of our choosen needle in a randomly
1925	* picked kernel:
1926	* k o b j
1927	* 22 6b 6f 62 6a aa
1928	* fc 6b 6f 62 6a aa
1929	* 82 6b 6f 62 6a 5f - ascii trail byte (_).
1930	* ee 6b 6f 62 6a aa
1931	* fc 6b 6f 62 6a 5f - ascii trail byte (_).
1932	* 0a 74 6b 6f 62 6a 5f ea - ascii lead (t) and trail (_) bytes.
1933	* 0b 54 6b 6f 62 6a aa - ascii lead byte (T).
1934	* ... omitting 29 samples similar to the last two ...
1935	* d8 6b 6f 62 6a aa
1936	* d8 6b 6f 62 6a aa
1937	* d8 6b 6f 62 6a aa
1938	* d8 6b 6f 62 6a aa
1939	* f9 5f 6b 6f 62 6a 5f 94 - ascii lead and trail bytes (_)
1940	* f9 5f 6b 6f 62 6a 0c - ascii lead byte (_).
1941	* fd 6b 6f 62 6a 0f
1942	* ... enough.
1943	*/
1944	uint8_t abBuf[32];
1945	DBGFADDRESS ReadAddr = *pHitAddr;
1946	DBGFR3AddrSub(&ReadAddr, 2);
1947	int rc = DBGFR3MemRead(pUVM, 0 /idCpu/, &ReadAddr, abBuf, 2 + cbNeedle + 2);
1948	if (RT_SUCCESS(rc))
1949	{
1950	if (memcmp(&abBuf[2], pabNeedle, cbNeedle) == 0) /* paranoia */
1951	{
1952	uint8_t const bLead = abBuf[1] == '_' \|\| abBuf[1] == 'T' \|\| abBuf[1] == 't' ? abBuf[0] : abBuf[1];
1953	uint8_t const offTail = 2 + cbNeedle;
1954	uint8_t const bTail = abBuf[offTail] == '_' ? abBuf[offTail] : abBuf[offTail + 1];
1955	if ( bLead >= 1 && (bLead < 0x20 \|\| bLead >= 0x80)
1956	&& bTail >= 1 && (bTail < 0x20 \|\| bTail >= 0x80))
1957	return true;
1958	Log(("dbgDiggerLinuxIsLikelyNameFragment: failed at %RGv: bLead=%#x bTail=%#x (offTail=%#x)\n",
1959	pHitAddr->FlatPtr, bLead, bTail, offTail));
1960	}
1961	else
1962	Log(("dbgDiggerLinuxIsLikelyNameFragment: failed at %RGv: Needle changed!\n", pHitAddr->FlatPtr));
1963	}
1964	else
1965	Log(("dbgDiggerLinuxIsLikelyNameFragment: failed at %RGv: %Rrc\n", pHitAddr->FlatPtr, rc));
1966
1967	return false;
1968	}
1969
1970	/**
1971	* Tries to find and load the kernel symbol table with the given needle.
1972	*
1973	* @returns VBox status code.
1974	* @param pThis The Linux digger data.
1975	* @param pUVM The user mode VM handle.
1976	* @param pabNeedle The needle to use for searching.
1977	* @param cbNeedle Size of the needle in bytes.
1978	*/
1979	static int dbgDiggerLinuxFindSymbolTableFromNeedle(PDBGDIGGERLINUX pThis, PUVM pUVM, uint8_t const *pabNeedle, uint8_t cbNeedle)
1980	{
1981	int rc = VINF_SUCCESS;
1982
1983	/*
1984	* Go looking for the kallsyms table. If it's there, it will be somewhere
1985	* after the linux_banner symbol, so use it for starting the search.
1986	*/
1987	DBGFADDRESS CurAddr = pThis->AddrLinuxBanner;
1988	uint32_t cbLeft = LNX_MAX_KERNEL_SIZE;
1989	while (cbLeft > 4096)
1990	{
1991	DBGFADDRESS HitAddr;
1992	rc = DBGFR3MemScan(pUVM, 0 /idCpu/, &CurAddr, cbLeft, 1 /uAlign/,
1993	pabNeedle, cbNeedle, &HitAddr);
1994	if (RT_FAILURE(rc))
1995	break;
1996	if (dbgDiggerLinuxIsLikelyNameFragment(pUVM, &HitAddr, pabNeedle, cbNeedle))
1997	{
1998	/* There will be another hit near by. */
1999	DBGFR3AddrAdd(&HitAddr, 1);
2000	rc = DBGFR3MemScan(pUVM, 0 /idCpu/, &HitAddr, LNX_MAX_KALLSYMS_NAMES_SIZE, 1 /uAlign/,
2001	pabNeedle, cbNeedle, &HitAddr);
2002	if ( RT_SUCCESS(rc)
2003	&& dbgDiggerLinuxIsLikelyNameFragment(pUVM, &HitAddr, pabNeedle, cbNeedle))
2004	{
2005	/*
2006	* We've got a very likely candidate for a location inside kallsyms_names.
2007	* Try find the start of it, that is to say, try find kallsyms_num_syms.
2008	* kallsyms_num_syms is aligned on sizeof(unsigned long) boundrary
2009	*/
2010	rc = dbgDiggerLinuxFindStartOfNamesAndSymbolCount(pUVM, pThis, &HitAddr);
2011	if (RT_SUCCESS(rc))
2012	rc = dbgDiggerLinuxFindEndOfNamesAndMore(pUVM, pThis, &HitAddr);
2013	if (RT_SUCCESS(rc))
2014	rc = dbgDiggerLinuxFindTokenIndex(pUVM, pThis);
2015	if (RT_SUCCESS(rc))
2016	rc = dbgDiggerLinuxLoadKernelSymbols(pUVM, pThis);
2017	if (RT_SUCCESS(rc))
2018	break;
2019	}
2020	}
2021
2022	/*
2023	* Advance.
2024	*/
2025	RTGCUINTPTR cbDistance = HitAddr.FlatPtr - CurAddr.FlatPtr + cbNeedle;
2026	if (RT_UNLIKELY(cbDistance >= cbLeft))
2027	{
2028	Log(("dbgDiggerLinuxInit: Failed to find kallsyms\n"));
2029	break;
2030	}
2031	cbLeft -= cbDistance;
2032	DBGFR3AddrAdd(&CurAddr, cbDistance);
2033
2034	}
2035
2036	return rc;
2037	}
2038
2039	/**
2040	* Skips whitespace and comments in the given config returning the pointer
2041	* to the first non whitespace character.
2042	*
2043	* @returns Pointer to the first non whitespace character or NULL if the end
2044	* of the string was reached.
2045	* @param pszCfg The config string.
2046	*/
2047	static const char dbgDiggerLinuxCfgSkipWhitespace(const char pszCfg)
2048	{
2049	do
2050	{
2051	while ( *pszCfg != '\0'
2052	&& ( RT_C_IS_SPACE(*pszCfg)
2053	\|\| *pszCfg == '\n'))
2054	pszCfg++;
2055
2056	/* Do we have a comment? Skip it. */
2057	if (*pszCfg == '#')
2058	{
2059	while ( *pszCfg != '\n'
2060	&& *pszCfg != '\0')
2061	pszCfg++;
2062	}
2063	} while ( *pszCfg != '\0'
2064	&& ( RT_C_IS_SPACE(*pszCfg)
2065	\|\| *pszCfg == '\n'
2066	\|\| *pszCfg == '#'));
2067
2068	return pszCfg;
2069	}
2070
2071	/**
2072	* Parses an identifier at the given position.
2073	*
2074	* @returns VBox status code.
2075	* @param pszCfg The config data.
2076	* @param ppszCfgNext Where to store the pointer to the data following the identifier.
2077	* @param ppszIde Where to store the pointer to the identifier on success.
2078	* Free with RTStrFree().
2079	*/
2080	static int dbgDiggerLinuxCfgParseIde(const char pszCfg, const char ppszCfgNext, char *ppszIde)
2081	{
2082	int rc = VINF_SUCCESS;
2083	size_t cchIde = 0;
2084
2085	while ( *pszCfg != '\0'
2086	&& ( RT_C_IS_ALNUM(*pszCfg)
2087	\|\| *pszCfg == '_'))
2088	{
2089	cchIde++;
2090	pszCfg++;
2091	}
2092
2093	if (cchIde)
2094	{
2095	*ppszIde = RTStrDupN(pszCfg - cchIde, cchIde);
2096	if (!*ppszIde)
2097	rc = VERR_NO_STR_MEMORY;
2098	}
2099
2100	*ppszCfgNext = pszCfg;
2101	return rc;
2102	}
2103
2104	/**
2105	* Parses a value for a config item.
2106	*
2107	* @returns VBox status code.
2108	* @param pszCfg The config data.
2109	* @param ppszCfgNext Where to store the pointer to the data following the identifier.
2110	* @param ppCfgItem Where to store the created config item on success.
2111	*/
2112	static int dbgDiggerLinuxCfgParseVal(const char pszCfg, const char *ppszCfgNext,
2113	PDBGDIGGERLINUXCFGITEM *ppCfgItem)
2114	{
2115	int rc = VINF_SUCCESS;
2116	PDBGDIGGERLINUXCFGITEM pCfgItem = NULL;
2117
2118	if (RT_C_IS_DIGIT(pszCfg) \|\| pszCfg == '-')
2119	{
2120	/* Parse the number. */
2121	int64_t i64Num;
2122	rc = RTStrToInt64Ex(pszCfg, (char **)ppszCfgNext, 0, &i64Num);
2123	if ( RT_SUCCESS(rc)
2124	\|\| rc == VWRN_TRAILING_CHARS
2125	\|\| rc == VWRN_TRAILING_SPACES)
2126	{
2127	pCfgItem = (PDBGDIGGERLINUXCFGITEM)RTMemAllocZ(sizeof(DBGDIGGERLINUXCFGITEM));
2128	if (pCfgItem)
2129	{
2130	pCfgItem->enmType = DBGDIGGERLINUXCFGITEMTYPE_NUMBER;
2131	pCfgItem->u.i64Num = i64Num;
2132	}
2133	else
2134	rc = VERR_NO_MEMORY;
2135	}
2136	}
2137	else if (*pszCfg == '\"')
2138	{
2139	/* Parse a string. */
2140	const char *pszCfgCur = pszCfg + 1;
2141	while ( *pszCfgCur != '\0'
2142	&& *pszCfgCur != '\"')
2143	pszCfgCur++;
2144
2145	if (*pszCfgCur == '\"')
2146	{
2147	pCfgItem = (PDBGDIGGERLINUXCFGITEM)RTMemAllocZ(RT_UOFFSETOF_DYN(DBGDIGGERLINUXCFGITEM,
2148	u.aszString[pszCfgCur - pszCfg + 1]));
2149	if (pCfgItem)
2150	{
2151	pCfgItem->enmType = DBGDIGGERLINUXCFGITEMTYPE_STRING;
2152	RTStrCopyEx(&pCfgItem->u.aszString[0], pszCfgCur - pszCfg + 1, pszCfg, pszCfgCur - pszCfg);
2153	*ppszCfgNext = pszCfgCur + 1;
2154	}
2155	else
2156	rc = VERR_NO_MEMORY;
2157	}
2158	else
2159	rc = VERR_INVALID_STATE;
2160	}
2161	else if ( *pszCfg == 'y'
2162	\|\| *pszCfg == 'm')
2163	{
2164	/* Included or module. */
2165	pCfgItem = (PDBGDIGGERLINUXCFGITEM)RTMemAllocZ(sizeof(DBGDIGGERLINUXCFGITEM));
2166	if (pCfgItem)
2167	{
2168	pCfgItem->enmType = DBGDIGGERLINUXCFGITEMTYPE_FLAG;
2169	pCfgItem->u.fModule = *pszCfg == 'm';
2170	}
2171	else
2172	rc = VERR_NO_MEMORY;
2173	pszCfg++;
2174	*ppszCfgNext = pszCfg;
2175	}
2176	else
2177	rc = VERR_INVALID_STATE;
2178
2179	if (RT_SUCCESS(rc))
2180	*ppCfgItem = pCfgItem;
2181	else if (pCfgItem)
2182	RTMemFree(pCfgItem);
2183
2184	return rc;
2185	}
2186
2187	/**
2188	* Parses the given kernel config and creates the config database.
2189	*
2190	* @returns VBox status code
2191	* @param pThis The Linux digger data.
2192	* @param pszCfg The config string.
2193	*/
2194	static int dbgDiggerLinuxCfgParse(PDBGDIGGERLINUX pThis, const char *pszCfg)
2195	{
2196	int rc = VINF_SUCCESS;
2197
2198	/*
2199	* The config is a text file with the following elements:
2200	* # starts a comment which goes till the end of the line
2201	* <Ide>=<val> where <Ide> is an identifier consisting of
2202	* alphanumerical characters (including _)
2203	* <val> denotes the value for the identifier and can have the following
2204	* formats:
2205	* (-)[0-9]* for numbers
2206	* "..." for a string value
2207	* m when a feature is enabled as a module
2208	* y when a feature is enabled
2209	* Newlines are used as a separator between values and mark the end
2210	* of a comment
2211	*/
2212	const char *pszCfgCur = pszCfg;
2213	while ( RT_SUCCESS(rc)
2214	&& *pszCfgCur != '\0')
2215	{
2216	/* Start skipping the whitespace. */
2217	pszCfgCur = dbgDiggerLinuxCfgSkipWhitespace(pszCfgCur);
2218	if ( pszCfgCur
2219	&& *pszCfgCur != '\0')
2220	{
2221	char *pszIde = NULL;
2222	/* Must be an identifier, parse it. */
2223	rc = dbgDiggerLinuxCfgParseIde(pszCfgCur, &pszCfgCur, &pszIde);
2224	if (RT_SUCCESS(rc))
2225	{
2226	/*
2227	* Skip whitespace again (shouldn't be required because = follows immediately
2228	* in the observed configs).
2229	*/
2230	pszCfgCur = dbgDiggerLinuxCfgSkipWhitespace(pszCfgCur);
2231	if ( pszCfgCur
2232	&& *pszCfgCur == '=')
2233	{
2234	pszCfgCur++;
2235	pszCfgCur = dbgDiggerLinuxCfgSkipWhitespace(pszCfgCur);
2236	if ( pszCfgCur
2237	&& *pszCfgCur != '\0')
2238	{
2239	/* Get the value. */
2240	PDBGDIGGERLINUXCFGITEM pCfgItem = NULL;
2241	rc = dbgDiggerLinuxCfgParseVal(pszCfgCur, &pszCfgCur, &pCfgItem);
2242	if (RT_SUCCESS(rc))
2243	{
2244	pCfgItem->Core.pszString = pszIde;
2245	bool fRc = RTStrSpaceInsert(&pThis->hCfgDb, &pCfgItem->Core);
2246	if (!fRc)
2247	{
2248	RTStrFree(pszIde);
2249	RTMemFree(pCfgItem);
2250	rc = VERR_INVALID_STATE;
2251	}
2252	}
2253	}
2254	else
2255	rc = VERR_EOF;
2256	}
2257	else
2258	rc = VERR_INVALID_STATE;
2259	}
2260
2261	if (RT_FAILURE(rc))
2262	RTStrFree(pszIde);
2263	}
2264	else
2265	break; /* Reached the end of the config. */
2266	}
2267
2268	if (RT_FAILURE(rc))
2269	dbgDiggerLinuxCfgDbDestroy(pThis);
2270
2271	return rc;
2272	}
2273
2274	/**
2275	* Decompresses the given config and validates the UTF-8 encoding.
2276	*
2277	* @returns VBox status code.
2278	* @param pbCfgComp The compressed config.
2279	* @param cbCfgComp Size of the compressed config.
2280	* @param ppszCfg Where to store the pointer to the decompressed config
2281	* on success.
2282	*/
2283	static int dbgDiggerLinuxCfgDecompress(const uint8_t pbCfgComp, size_t cbCfgComp, char *ppszCfg)
2284	{
2285	int rc = VINF_SUCCESS;
2286	RTVFSIOSTREAM hVfsIos = NIL_RTVFSIOSTREAM;
2287
2288	rc = RTVfsIoStrmFromBuffer(RTFILE_O_READ, pbCfgComp, cbCfgComp, &hVfsIos);
2289	if (RT_SUCCESS(rc))
2290	{
2291	RTVFSIOSTREAM hVfsIosDecomp = NIL_RTVFSIOSTREAM;
2292	rc = RTZipGzipDecompressIoStream(hVfsIos, RTZIPGZIPDECOMP_F_ALLOW_ZLIB_HDR, &hVfsIosDecomp);
2293	if (RT_SUCCESS(rc))
2294	{
2295	char *pszCfg = NULL;
2296	size_t cchCfg = 0;
2297	size_t cbRead = 0;
2298
2299	do
2300	{
2301	uint8_t abBuf[_64K];
2302	rc = RTVfsIoStrmRead(hVfsIosDecomp, abBuf, sizeof(abBuf), true /fBlocking/, &cbRead);
2303	if (rc == VINF_EOF && cbRead == 0)
2304	rc = VINF_SUCCESS;
2305	if ( RT_SUCCESS(rc)
2306	&& cbRead > 0)
2307	{
2308	/* Append data. */
2309	char *pszCfgNew = pszCfg;
2310	rc = RTStrRealloc(&pszCfgNew, cchCfg + cbRead + 1);
2311	if (RT_SUCCESS(rc))
2312	{
2313	pszCfg = pszCfgNew;
2314	memcpy(pszCfg + cchCfg, &abBuf[0], cbRead);
2315	cchCfg += cbRead;
2316	pszCfg[cchCfg] = '\0'; /* Enforce string termination. */
2317	}
2318	}
2319	} while (RT_SUCCESS(rc) && cbRead > 0);
2320
2321	if (RT_SUCCESS(rc))
2322	*ppszCfg = pszCfg;
2323	else if (RT_FAILURE(rc) && pszCfg)
2324	RTStrFree(pszCfg);
2325
2326	RTVfsIoStrmRelease(hVfsIosDecomp);
2327	}
2328	RTVfsIoStrmRelease(hVfsIos);
2329	}
2330
2331	return rc;
2332	}
2333
2334	/**
2335	* Reads and decodes the compressed kernel config.
2336	*
2337	* @returns VBox status code.
2338	* @param pThis The Linux digger data.
2339	* @param pUVM The user mode VM handle.
2340	* @param pAddrStart The start address of the compressed config.
2341	* @param cbCfgComp The size of the compressed config.
2342	*/
2343	static int dbgDiggerLinuxCfgDecode(PDBGDIGGERLINUX pThis, PUVM pUVM,
2344	PCDBGFADDRESS pAddrStart, size_t cbCfgComp)
2345	{
2346	int rc = VINF_SUCCESS;
2347	uint8_t pbCfgComp = (uint8_t )RTMemTmpAlloc(cbCfgComp);
2348	if (!pbCfgComp)
2349	return VERR_NO_MEMORY;
2350
2351	rc = DBGFR3MemRead(pUVM, 0 /idCpu/, pAddrStart, pbCfgComp, cbCfgComp);
2352	if (RT_SUCCESS(rc))
2353	{
2354	char *pszCfg = NULL;
2355	rc = dbgDiggerLinuxCfgDecompress(pbCfgComp, cbCfgComp, &pszCfg);
2356	if (RT_SUCCESS(rc))
2357	{
2358	if (RTStrIsValidEncoding(pszCfg))
2359	rc = dbgDiggerLinuxCfgParse(pThis, pszCfg);
2360	else
2361	rc = VERR_INVALID_UTF8_ENCODING;
2362	RTStrFree(pszCfg);
2363	}
2364	}
2365
2366	RTMemFree(pbCfgComp);
2367	return rc;
2368	}
2369
2370	/**
2371	* Tries to find the compressed kernel config in the kernel address space
2372	* and sets up the config database.
2373	*
2374	* @returns VBox status code.
2375	* @param pThis The Linux digger data.
2376	* @param pUVM The user mode VM handle.
2377	*/
2378	static int dbgDiggerLinuxCfgFind(PDBGDIGGERLINUX pThis, PUVM pUVM)
2379	{
2380	int rc = VINF_SUCCESS;
2381
2382	/*
2383	* Go looking for the IKCFG_ST string which indicates the start
2384	* of the compressed config file.
2385	*/
2386	static const uint8_t s_abCfgNeedleStart[] = "IKCFG_ST";
2387	static const uint8_t s_abCfgNeedleEnd[] = "IKCFG_ED";
2388	DBGFADDRESS CurAddr = pThis->AddrLinuxBanner;
2389	uint32_t cbLeft = LNX_MAX_KERNEL_SIZE;
2390	while (cbLeft > 4096)
2391	{
2392	DBGFADDRESS HitAddrStart;
2393	rc = DBGFR3MemScan(pUVM, 0 /idCpu/, &CurAddr, cbLeft, 1 /uAlign/,
2394	s_abCfgNeedleStart, sizeof(s_abCfgNeedleStart) - 1, &HitAddrStart);
2395	if (RT_FAILURE(rc))
2396	break;
2397
2398	/* Check for the end marker which shouldn't be that far away. */
2399	DBGFR3AddrAdd(&HitAddrStart, sizeof(s_abCfgNeedleStart) - 1);
2400	DBGFADDRESS HitAddrEnd;
2401	rc = DBGFR3MemScan(pUVM, 0 /* idCpu */, &HitAddrStart, LNX_MAX_COMPRESSED_CFG_SIZE,
2402	1 /* uAlign */, s_abCfgNeedleEnd, sizeof(s_abCfgNeedleEnd) - 1, &HitAddrEnd);
2403	if (RT_SUCCESS(rc))
2404	{
2405	/* Allocate a buffer to hold the compressed data between the markers and fetch it. */
2406	RTGCUINTPTR cbCfg = HitAddrEnd.FlatPtr - HitAddrStart.FlatPtr;
2407	Assert(cbCfg == (size_t)cbCfg);
2408	rc = dbgDiggerLinuxCfgDecode(pThis, pUVM, &HitAddrStart, cbCfg);
2409	if (RT_SUCCESS(rc))
2410	break;
2411	}
2412
2413	/*
2414	* Advance.
2415	*/
2416	RTGCUINTPTR cbDistance = HitAddrStart.FlatPtr - CurAddr.FlatPtr + sizeof(s_abCfgNeedleStart) - 1;
2417	if (RT_UNLIKELY(cbDistance >= cbLeft))
2418	{
2419	LogFunc(("Failed to find compressed kernel config\n"));
2420	break;
2421	}
2422	cbLeft -= cbDistance;
2423	DBGFR3AddrAdd(&CurAddr, cbDistance);
2424
2425	}
2426
2427	return rc;
2428	}
2429
2430	/**
2431	* Probes for a Linux kernel starting at the given address.
2432	*
2433	* @returns Flag whether something which looks like a valid Linux kernel was found.
2434	* @param pThis The Linux digger data.
2435	* @param pUVM The user mode VM handle.
2436	* @param uAddrStart The address to start scanning at.
2437	* @param cbScan How much to scan.
2438	*/
2439	static bool dbgDiggerLinuxProbeWithAddr(PDBGDIGGERLINUX pThis, PUVM pUVM, RTGCUINTPTR uAddrStart, size_t cbScan)
2440	{
2441	/*
2442	* Look for "Linux version " at the start of the rodata segment.
2443	* Hope that this comes before any message buffer or other similar string.
2444	*/
2445	DBGFADDRESS KernelAddr;
2446	DBGFR3AddrFromFlat(pUVM, &KernelAddr, uAddrStart);
2447	DBGFADDRESS HitAddr;
2448	int rc = DBGFR3MemScan(pUVM, 0, &KernelAddr, cbScan, 1,
2449	g_abLinuxVersion, sizeof(g_abLinuxVersion) - 1, &HitAddr);
2450	if (RT_SUCCESS(rc))
2451	{
2452	char szTmp[128];
2453	char const *pszX = &szTmp[sizeof(g_abLinuxVersion) - 1];
2454	rc = DBGFR3MemReadString(pUVM, 0, &HitAddr, szTmp, sizeof(szTmp));
2455	if ( RT_SUCCESS(rc)
2456	&& ( ( pszX[0] == '2' /* 2.x.y with x in {0..6} */
2457	&& pszX[1] == '.'
2458	&& pszX[2] >= '0'
2459	&& pszX[2] <= '6')
2460	\|\| ( pszX[0] >= '3' /* 3.x, 4.x, ... 9.x */
2461	&& pszX[0] <= '9'
2462	&& pszX[1] == '.'
2463	&& pszX[2] >= '0'
2464	&& pszX[2] <= '9')
2465	)
2466	)
2467	{
2468	pThis->AddrKernelBase = KernelAddr;
2469	pThis->AddrLinuxBanner = HitAddr;
2470	return true;
2471	}
2472	}
2473
2474	return false;
2475	}
2476
2477	/**
2478	* Probes for a Linux kernel which has KASLR enabled.
2479	*
2480	* @returns Flag whether a possible candidate location was found.
2481	* @param pThis The Linux digger data.
2482	* @param pUVM The user mode VM handle.
2483	* @param uAddrKernelStart The first address the kernel is expected at.
2484	*/
2485	static bool dbgDiggerLinuxProbeKaslr(PDBGDIGGERLINUX pThis, PUVM pUVM, RTGCUINTPTR uAddrKernelStart)
2486	{
2487	/**
2488	* With KASLR the kernel is loaded at a different address at each boot making detection
2489	* more difficult for us.
2490	*
2491	* The randomization is done in arch/x86/boot/compressed/kaslr.c:choose_random_location() (as of Nov 2017).
2492	* At the end of the method a random offset is chosen using find_random_virt_addr() which is added to the
2493	* kernel map start in the caller (the start of the kernel depends on the bit size, see LNX32_KERNEL_ADDRESS_START
2494	* and LNX64_KERNEL_ADDRESS_START for 32bit and 64bit kernels respectively).
2495	* The lowest offset possible is LOAD_PHYSICAL_ADDR which is defined in arch/x86/include/asm/boot.h
2496	* using CONFIG_PHYSICAL_START aligned to CONFIG_PHYSICAL_ALIGN.
2497	* The default CONFIG_PHYSICAL_START and CONFIG_PHYSICAL_ALIGN are both 0x1000000 no matter whether a 32bit
2498	* or a 64bit kernel is used. So the lowest offset to the kernel start address is 0x1000000.
2499	* The find_random_virt_addr() the number of possible slots where the kernel can be placed based on the image size
2500	* is calculated using the following formula:
2501	* cSlots = ((KERNEL_IMAGE_SIZE - 0x1000000 (minimum) - image_size) / 0x1000000 (CONFIG_PHYSICAL_ALIGN)) + 1
2502	*
2503	* KERNEL_IMAGE_SIZE is 1GB for 64bit kernels and 512MB for 32bit kernels, so the maximum number of slots (resulting
2504	* in the largest possible offset) can be achieved when image_size (which contains the real size of the kernel image
2505	* which is unknown for us) goes to 0 and a 1GB KERNEL_IMAGE_SIZE is assumed. With that the biggest cSlots which can be
2506	* achieved is 64. The chosen random offset is taken from a random long integer using kaslr_get_random_long() modulo the
2507	* number of slots which selects a slot between 0 and 63. The final offset is calculated using:
2508	* offAddr = random_addr * 0x1000000 (CONFIG_PHYSICAL_ALIGN) + 0x1000000 (minimum)
2509	*
2510	* So the highest offset the kernel can start is 0x40000000 which is 1GB (plus the maximum kernel size we defined).
2511	*/
2512	if (dbgDiggerLinuxProbeWithAddr(pThis, pUVM, uAddrKernelStart, _1G + LNX_MAX_KERNEL_SIZE))
2513	return true;
2514
2515	return false;
2516	}
2517
2518	/**
2519	* @copydoc DBGFOSREG::pfnInit
2520	*/
2521	static DECLCALLBACK(int) dbgDiggerLinuxInit(PUVM pUVM, void *pvData)
2522	{
2523	PDBGDIGGERLINUX pThis = (PDBGDIGGERLINUX)pvData;
2524	Assert(!pThis->fValid);
2525
2526	/*
2527	* Assume 64-bit kernels all live way beyond 32-bit address space.
2528	*/
2529	pThis->f64Bit = pThis->AddrLinuxBanner.FlatPtr > UINT32_MAX;
2530	pThis->fRelKrnlAddr = false;
2531
2532	pThis->hCfgDb = NULL;
2533
2534	/*
2535	* Try to find the compressed kernel config and parse it before we try
2536	* to get the symbol table, the config database is required to select
2537	* the method to use.
2538	*/
2539	int rc = dbgDiggerLinuxCfgFind(pThis, pUVM);
2540	if (RT_FAILURE(rc))
2541	LogFlowFunc(("Failed to find kernel config (%Rrc), no config database available\n", rc));
2542
2543	static const uint8_t s_abNeedle[] = "kobj";
2544	rc = dbgDiggerLinuxFindSymbolTableFromNeedle(pThis, pUVM, s_abNeedle, sizeof(s_abNeedle) - 1);
2545	if (RT_FAILURE(rc))
2546	{
2547	/* Try alternate needle (seen on older x86 Linux kernels). */
2548	static const uint8_t s_abNeedleAlt[] = "kobjec";
2549	rc = dbgDiggerLinuxFindSymbolTableFromNeedle(pThis, pUVM, s_abNeedleAlt, sizeof(s_abNeedleAlt) - 1);
2550	if (RT_FAILURE(rc))
2551	{
2552	static const uint8_t s_abNeedleOSuseX86[] = "nmi"; /* OpenSuSe 10.2 x86 */
2553	rc = dbgDiggerLinuxFindSymbolTableFromNeedle(pThis, pUVM, s_abNeedleOSuseX86, sizeof(s_abNeedleOSuseX86) - 1);
2554	}
2555	}
2556
2557	pThis->fValid = true;
2558	return VINF_SUCCESS;
2559	}
2560
2561
2562	/**
2563	* @copydoc DBGFOSREG::pfnProbe
2564	*/
2565	static DECLCALLBACK(bool) dbgDiggerLinuxProbe(PUVM pUVM, void *pvData)
2566	{
2567	PDBGDIGGERLINUX pThis = (PDBGDIGGERLINUX)pvData;
2568
2569	for (unsigned i = 0; i < RT_ELEMENTS(g_au64LnxKernelAddresses); i++)
2570	{
2571	if (dbgDiggerLinuxProbeWithAddr(pThis, pUVM, g_au64LnxKernelAddresses[i], LNX_MAX_KERNEL_SIZE))
2572	return true;
2573	}
2574
2575	/* Maybe the kernel uses KASLR. */
2576	if (dbgDiggerLinuxProbeKaslr(pThis, pUVM, LNX32_KERNEL_ADDRESS_START))
2577	return true;
2578
2579	if (dbgDiggerLinuxProbeKaslr(pThis, pUVM, LNX64_KERNEL_ADDRESS_START))
2580	return true;
2581
2582	return false;
2583	}
2584
2585
2586	/**
2587	* @copydoc DBGFOSREG::pfnDestruct
2588	*/
2589	static DECLCALLBACK(void) dbgDiggerLinuxDestruct(PUVM pUVM, void *pvData)
2590	{
2591	RT_NOREF2(pUVM, pvData);
2592	}
2593
2594
2595	/**
2596	* @copydoc DBGFOSREG::pfnConstruct
2597	*/
2598	static DECLCALLBACK(int) dbgDiggerLinuxConstruct(PUVM pUVM, void *pvData)
2599	{
2600	RT_NOREF1(pUVM);
2601	PDBGDIGGERLINUX pThis = (PDBGDIGGERLINUX)pvData;
2602	pThis->IDmesg.u32Magic = DBGFOSIDMESG_MAGIC;
2603	pThis->IDmesg.pfnQueryKernelLog = dbgDiggerLinuxIDmsg_QueryKernelLog;
2604	pThis->IDmesg.u32EndMagic = DBGFOSIDMESG_MAGIC;
2605
2606	return VINF_SUCCESS;
2607	}
2608
2609
2610	const DBGFOSREG g_DBGDiggerLinux =
2611	{
2612	/* .u32Magic = */ DBGFOSREG_MAGIC,
2613	/* .fFlags = */ 0,
2614	/* .cbData = */ sizeof(DBGDIGGERLINUX),
2615	/* .szName = */ "Linux",
2616	/* .pfnConstruct = */ dbgDiggerLinuxConstruct,
2617	/* .pfnDestruct = */ dbgDiggerLinuxDestruct,
2618	/* .pfnProbe = */ dbgDiggerLinuxProbe,
2619	/* .pfnInit = */ dbgDiggerLinuxInit,
2620	/* .pfnRefresh = */ dbgDiggerLinuxRefresh,
2621	/* .pfnTerm = */ dbgDiggerLinuxTerm,
2622	/* .pfnQueryVersion = */ dbgDiggerLinuxQueryVersion,
2623	/* .pfnQueryInterface = */ dbgDiggerLinuxQueryInterface,
2624	/* .pfnStackUnwindAssist = */ dbgDiggerLinuxStackUnwindAssist,
2625	/* .u32EndMagic = */ DBGFOSREG_MAGIC
2626	};
2627

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source: vbox/trunk/src/VBox/Debugger/DBGPlugInLinux.cpp@ 74087

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