ldrELFRelocatable.cpp.h@ 52213

Last change on this file since 52213 was 52213, checked in by vboxsync, 10 years ago
SUP,IPRT: Implemented forwarder support in RTLdr and cleaned up some the ordinal mess. Resolved imports when doing the process verification/purification runs other than SUPHARDNTVPKIND_CHILD_PURIFICATION. This is necessary since 32-bit windows combine .text with .rdata, and we don't want to overwrite the import table after it has been snapped. Include read-only sections in the verfication runs.
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1	/* $Id: ldrELFRelocatable.cpp.h 52213 2014-07-28 17:52:58Z vboxsync $ */
2	/** @file
3	* IPRT - Binary Image Loader, Template for ELF Relocatable Images.
4	*/
5
6	/*
7	* Copyright (C) 2006-2012 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	* The contents of this file may alternatively be used under the terms
18	* of the Common Development and Distribution License Version 1.0
19	* (CDDL) only, as it comes in the "COPYING.CDDL" file of the
20	* VirtualBox OSE distribution, in which case the provisions of the
21	* CDDL are applicable instead of those of the GPL.
22	*
23	* You may elect to license modified versions of this file under the
24	* terms and conditions of either the GPL or the CDDL or both.
25	*/
26
27
28	/*******************************************************************************
29	* Defined Constants And Macros *
30	*******************************************************************************/
31	#if ELF_MODE == 32
32	#define RTLDRELF_NAME(name) rtldrELF32##name
33	#define RTLDRELF_SUFF(name) name##32
34	#define RTLDRELF_MID(pre,suff) pre##32##suff
35	#define FMT_ELF_ADDR "%08RX32"
36	#define FMT_ELF_HALF "%04RX16"
37	#define FMT_ELF_OFF "%08RX32"
38	#define FMT_ELF_SIZE "%08RX32"
39	#define FMT_ELF_SWORD "%RI32"
40	#define FMT_ELF_WORD "%08RX32"
41	#define FMT_ELF_XWORD "%08RX32"
42	#define FMT_ELF_SXWORD "%RI32"
43
44	#elif ELF_MODE == 64
45	#define RTLDRELF_NAME(name) rtldrELF64##name
46	#define RTLDRELF_SUFF(name) name##64
47	#define RTLDRELF_MID(pre,suff) pre##64##suff
48	#define FMT_ELF_ADDR "%016RX64"
49	#define FMT_ELF_HALF "%04RX16"
50	#define FMT_ELF_SHALF "%RI16"
51	#define FMT_ELF_OFF "%016RX64"
52	#define FMT_ELF_SIZE "%016RX64"
53	#define FMT_ELF_SWORD "%RI32"
54	#define FMT_ELF_WORD "%08RX32"
55	#define FMT_ELF_XWORD "%016RX64"
56	#define FMT_ELF_SXWORD "%RI64"
57	#endif
58
59	#define Elf_Ehdr RTLDRELF_MID(Elf,_Ehdr)
60	#define Elf_Phdr RTLDRELF_MID(Elf,_Phdr)
61	#define Elf_Shdr RTLDRELF_MID(Elf,_Shdr)
62	#define Elf_Sym RTLDRELF_MID(Elf,_Sym)
63	#define Elf_Rel RTLDRELF_MID(Elf,_Rel)
64	#define Elf_Rela RTLDRELF_MID(Elf,_Rela)
65	#define Elf_Nhdr RTLDRELF_MID(Elf,_Nhdr)
66	#define Elf_Dyn RTLDRELF_MID(Elf,_Dyn)
67	#define Elf_Addr RTLDRELF_MID(Elf,_Addr)
68	#define Elf_Half RTLDRELF_MID(Elf,_Half)
69	#define Elf_Off RTLDRELF_MID(Elf,_Off)
70	#define Elf_Size RTLDRELF_MID(Elf,_Size)
71	#define Elf_Sword RTLDRELF_MID(Elf,_Sword)
72	#define Elf_Word RTLDRELF_MID(Elf,_Word)
73
74	#define RTLDRMODELF RTLDRELF_MID(RTLDRMODELF,RT_NOTHING)
75	#define PRTLDRMODELF RTLDRELF_MID(PRTLDRMODELF,RT_NOTHING)
76
77	#define ELF_R_SYM(info) RTLDRELF_MID(ELF,_R_SYM)(info)
78	#define ELF_R_TYPE(info) RTLDRELF_MID(ELF,_R_TYPE)(info)
79	#define ELF_R_INFO(sym, type) RTLDRELF_MID(ELF,_R_INFO)(sym, type)
80
81	#define ELF_ST_BIND(info) RTLDRELF_MID(ELF,_ST_BIND)(info)
82
83
84
85	/*******************************************************************************
86	* Structures and Typedefs *
87	*******************************************************************************/
88	/**
89	* The ELF loader structure.
90	*/
91	typedef struct RTLDRMODELF
92	{
93	/** Core module structure. */
94	RTLDRMODINTERNAL Core;
95	/** Pointer to readonly mapping of the image bits.
96	* This mapping is provided by the pReader. */
97	const void *pvBits;
98
99	/** The ELF header. */
100	Elf_Ehdr Ehdr;
101	/** Pointer to our copy of the section headers with sh_addr as RVAs.
102	* The virtual addresses in this array is the 0 based assignments we've given the image.
103	* Not valid if the image is DONE. */
104	Elf_Shdr *paShdrs;
105	/** Unmodified section headers (allocated after paShdrs, so no need to free).
106	* Not valid if the image is DONE. */
107	Elf_Shdr const *paOrgShdrs;
108	/** The size of the loaded image. */
109	size_t cbImage;
110
111	/** The image base address if it's an EXEC or DYN image. */
112	Elf_Addr LinkAddress;
113
114	/** The symbol section index. */
115	unsigned iSymSh;
116	/** Number of symbols in the table. */
117	unsigned cSyms;
118	/** Pointer to symbol table within RTLDRMODELF::pvBits. */
119	const Elf_Sym *paSyms;
120
121	/** The string section index. */
122	unsigned iStrSh;
123	/** Size of the string table. */
124	unsigned cbStr;
125	/** Pointer to string table within RTLDRMODELF::pvBits. */
126	const char *pStr;
127
128	/** Size of the section header string table. */
129	unsigned cbShStr;
130	/** Pointer to section header string table within RTLDRMODELF::pvBits. */
131	const char *pShStr;
132	} RTLDRMODELF, *PRTLDRMODELF;
133
134
135	/**
136	* Maps the image bits into memory and resolve pointers into it.
137	*
138	* @returns iprt status code.
139	* @param pModElf The ELF loader module instance data.
140	* @param fNeedsBits Set if we actually need the pvBits member.
141	* If we don't, we can simply read the string and symbol sections, thus saving memory.
142	*/
143	static int RTLDRELF_NAME(MapBits)(PRTLDRMODELF pModElf, bool fNeedsBits)
144	{
145	NOREF(fNeedsBits);
146	if (pModElf->pvBits)
147	return VINF_SUCCESS;
148	int rc = pModElf->Core.pReader->pfnMap(pModElf->Core.pReader, &pModElf->pvBits);
149	if (RT_SUCCESS(rc))
150	{
151	const uint8_t pu8 = (const uint8_t )pModElf->pvBits;
152	if (pModElf->iSymSh != ~0U)
153	pModElf->paSyms = (const Elf_Sym *)(pu8 + pModElf->paShdrs[pModElf->iSymSh].sh_offset);
154	if (pModElf->iStrSh != ~0U)
155	pModElf->pStr = (const char *)(pu8 + pModElf->paShdrs[pModElf->iStrSh].sh_offset);
156	pModElf->pShStr = (const char *)(pu8 + pModElf->paShdrs[pModElf->Ehdr.e_shstrndx].sh_offset);
157	}
158	return rc;
159	}
160
161
162	/*
163	*
164	* EXEC & DYN.
165	* EXEC & DYN.
166	* EXEC & DYN.
167	* EXEC & DYN.
168	* EXEC & DYN.
169	*
170	*/
171
172
173	/**
174	* Applies the fixups for a section in an executable image.
175	*
176	* @returns iprt status code.
177	* @param pModElf The ELF loader module instance data.
178	* @param BaseAddr The base address which the module is being fixedup to.
179	* @param pfnGetImport The callback function to use to resolve imports (aka unresolved externals).
180	* @param pvUser User argument to pass to the callback.
181	* @param SecAddr The section address. This is the address the relocations are relative to.
182	* @param cbSec The section size. The relocations must be inside this.
183	* @param pu8SecBaseR Where we read section bits from.
184	* @param pu8SecBaseW Where we write section bits to.
185	* @param pvRelocs Pointer to where we read the relocations from.
186	* @param cbRelocs Size of the relocations.
187	*/
188	static int RTLDRELF_NAME(RelocateSectionExecDyn)(PRTLDRMODELF pModElf, Elf_Addr BaseAddr,
189	PFNRTLDRIMPORT pfnGetImport, void *pvUser,
190	const Elf_Addr SecAddr, Elf_Size cbSec,
191	const uint8_t pu8SecBaseR, uint8_t pu8SecBaseW,
192	const void *pvRelocs, Elf_Size cbRelocs)
193	{
194	#if ELF_MODE != 32
195	NOREF(pu8SecBaseR);
196	#endif
197
198	/*
199	* Iterate the relocations.
200	* The relocations are stored in an array of Elf32_Rel records and covers the entire relocation section.
201	*/
202	const Elf_Addr offDelta = BaseAddr - pModElf->LinkAddress;
203	const Elf_Reloc paRels = (const Elf_Reloc )pvRelocs;
204	const unsigned iRelMax = (unsigned)(cbRelocs / sizeof(paRels[0]));
205	AssertMsgReturn(iRelMax == cbRelocs / sizeof(paRels[0]), (FMT_ELF_SIZE "\n", cbRelocs / sizeof(paRels[0])),
206	VERR_IMAGE_TOO_BIG);
207	for (unsigned iRel = 0; iRel < iRelMax; iRel++)
208	{
209	/*
210	* Skip R_XXX_NONE entries early to avoid confusion in the symbol
211	* getter code.
212	*/
213	#if ELF_MODE == 32
214	if (ELF_R_TYPE(paRels[iRel].r_info) == R_386_NONE)
215	continue;
216	#elif ELF_MODE == 64
217	if (ELF_R_TYPE(paRels[iRel].r_info) == R_X86_64_NONE)
218	continue;
219	#endif
220
221	/*
222	* Validate and find the symbol, resolve undefined ones.
223	*/
224	Elf_Size iSym = ELF_R_SYM(paRels[iRel].r_info);
225	if (iSym >= pModElf->cSyms)
226	{
227	AssertMsgFailed(("iSym=%d is an invalid symbol index!\n", iSym));
228	return VERR_LDRELF_INVALID_SYMBOL_INDEX;
229	}
230	const Elf_Sym *pSym = &pModElf->paSyms[iSym];
231	if (pSym->st_name >= pModElf->cbStr)
232	{
233	AssertMsgFailed(("iSym=%d st_name=%d str sh_size=%d\n", iSym, pSym->st_name, pModElf->cbStr));
234	return VERR_LDRELF_INVALID_SYMBOL_NAME_OFFSET;
235	}
236
237	Elf_Addr SymValue = 0;
238	if (pSym->st_shndx == SHN_UNDEF)
239	{
240	/* Try to resolve the symbol. */
241	const char *pszName = ELF_STR(pModElf, pSym->st_name);
242	RTUINTPTR ExtValue;
243	int rc = pfnGetImport(&pModElf->Core, "", pszName, ~0, &ExtValue, pvUser);
244	AssertMsgRCReturn(rc, ("Failed to resolve '%s' rc=%Rrc\n", pszName, rc), rc);
245	SymValue = (Elf_Addr)ExtValue;
246	AssertMsgReturn((RTUINTPTR)SymValue == ExtValue, ("Symbol value overflowed! '%s'\n", pszName),
247	VERR_SYMBOL_VALUE_TOO_BIG);
248	Log2(("rtldrELF: #%-3d - UNDEF " FMT_ELF_ADDR " '%s'\n", iSym, SymValue, pszName));
249	}
250	else
251	{
252	AssertReturn(pSym->st_shndx < pModElf->cSyms \|\| pSym->st_shndx == SHN_ABS, ("%#x\n", pSym->st_shndx));
253	#if ELF_MODE == 64
254	SymValue = pSym->st_value;
255	#endif
256	}
257
258	#if ELF_MODE == 64
259	/* Calc the value. */
260	Elf_Addr Value;
261	if (pSym->st_shndx < pModElf->cSyms)
262	Value = SymValue + offDelta;
263	else
264	Value = SymValue + paRels[iRel].r_addend;
265	#endif
266
267	/*
268	* Apply the fixup.
269	*/
270	AssertMsgReturn(paRels[iRel].r_offset < cbSec, (FMT_ELF_ADDR " " FMT_ELF_SIZE "\n", paRels[iRel].r_offset, cbSec), VERR_LDRELF_INVALID_RELOCATION_OFFSET);
271	#if ELF_MODE == 32
272	const Elf_Addr pAddrR = (const Elf_Addr )(pu8SecBaseR + paRels[iRel].r_offset); /* Where to read the addend. */
273	#endif
274	Elf_Addr pAddrW = (Elf_Addr )(pu8SecBaseW + paRels[iRel].r_offset); /* Where to write the fixup. */
275	switch (ELF_R_TYPE(paRels[iRel].r_info))
276	{
277	#if ELF_MODE == 32
278	/*
279	* Absolute addressing.
280	*/
281	case R_386_32:
282	{
283	Elf_Addr Value;
284	if (pSym->st_shndx < pModElf->Ehdr.e_shnum)
285	Value = pAddrR + offDelta; / Simplified. */
286	else if (pSym->st_shndx == SHN_ABS)
287	continue; /* Internal fixup, no need to apply it. */
288	else if (pSym->st_shndx == SHN_UNDEF)
289	Value = SymValue + *pAddrR;
290	else
291	AssertFailedReturn(VERR_LDR_GENERAL_FAILURE); /** @todo SHN_COMMON */
292	(uint32_t )pAddrW = Value;
293	Log4((FMT_ELF_ADDR": R_386_32 Value=" FMT_ELF_ADDR "\n", SecAddr + paRels[iRel].r_offset + BaseAddr, Value));
294	break;
295	}
296
297	/*
298	* PC relative addressing.
299	*/
300	case R_386_PC32:
301	{
302	Elf_Addr Value;
303	if (pSym->st_shndx < pModElf->Ehdr.e_shnum)
304	continue; /* Internal fixup, no need to apply it. */
305	else if (pSym->st_shndx == SHN_ABS)
306	Value = pAddrR + offDelta; / Simplified. */
307	else if (pSym->st_shndx == SHN_UNDEF)
308	{
309	const Elf_Addr SourceAddr = SecAddr + paRels[iRel].r_offset + BaseAddr; /* Where the source really is. */
310	Value = SymValue + (uint32_t )pAddrR - SourceAddr;
311	(uint32_t )pAddrW = Value;
312	}
313	else
314	AssertFailedReturn(VERR_LDR_GENERAL_FAILURE); /** @todo SHN_COMMON */
315	Log4((FMT_ELF_ADDR": R_386_PC32 Value=" FMT_ELF_ADDR "\n", SecAddr + paRels[iRel].r_offset + BaseAddr, Value));
316	break;
317	}
318
319	#elif ELF_MODE == 64
320
321	/*
322	* Absolute addressing
323	*/
324	case R_X86_64_64:
325	{
326	(uint64_t )pAddrW = Value;
327	Log4((FMT_ELF_ADDR": R_X86_64_64 Value=" FMT_ELF_ADDR " SymValue=" FMT_ELF_ADDR "\n",
328	SecAddr + paRels[iRel].r_offset + BaseAddr, Value, SymValue));
329	break;
330	}
331
332	/*
333	* Truncated 32-bit value (zero-extendedable to the 64-bit value).
334	*/
335	case R_X86_64_32:
336	{
337	(uint32_t )pAddrW = (uint32_t)Value;
338	Log4((FMT_ELF_ADDR": R_X86_64_32 Value=" FMT_ELF_ADDR " SymValue=" FMT_ELF_ADDR "\n",
339	SecAddr + paRels[iRel].r_offset + BaseAddr, Value, SymValue));
340	AssertMsgReturn((Elf_Addr)(uint32_t )pAddrW == SymValue, ("Value=" FMT_ELF_ADDR "\n", SymValue),
341	VERR_SYMBOL_VALUE_TOO_BIG);
342	break;
343	}
344
345	/*
346	* Truncated 32-bit value (sign-extendedable to the 64-bit value).
347	*/
348	case R_X86_64_32S:
349	{
350	(int32_t )pAddrW = (int32_t)Value;
351	Log4((FMT_ELF_ADDR": R_X86_64_32S Value=" FMT_ELF_ADDR " SymValue=" FMT_ELF_ADDR "\n",
352	SecAddr + paRels[iRel].r_offset + BaseAddr, Value, SymValue));
353	AssertMsgReturn((Elf_Addr)(int32_t )pAddrW == Value, ("Value=" FMT_ELF_ADDR "\n", Value), VERR_SYMBOL_VALUE_TOO_BIG); /** @todo check the sign-extending here. */
354	break;
355	}
356
357	/*
358	* PC relative addressing.
359	*/
360	case R_X86_64_PC32:
361	{
362	const Elf_Addr SourceAddr = SecAddr + paRels[iRel].r_offset + BaseAddr; /* Where the source really is. */
363	Value -= SourceAddr;
364	(int32_t )pAddrW = (int32_t)Value;
365	Log4((FMT_ELF_ADDR": R_X86_64_PC32 Value=" FMT_ELF_ADDR " SymValue=" FMT_ELF_ADDR "\n",
366	SourceAddr, Value, SymValue));
367	AssertMsgReturn((Elf_Addr)(int32_t )pAddrW == Value, ("Value=" FMT_ELF_ADDR "\n", Value), VERR_SYMBOL_VALUE_TOO_BIG); /** @todo check the sign-extending here. */
368	break;
369	}
370	#endif
371
372	default:
373	AssertMsgFailed(("Unknown relocation type: %d (iRel=%d iRelMax=%d)\n",
374	ELF_R_TYPE(paRels[iRel].r_info), iRel, iRelMax));
375	return VERR_LDRELF_RELOCATION_NOT_SUPPORTED;
376	}
377	}
378
379	return VINF_SUCCESS;
380	}
381
382
383
384	/*
385	*
386	* REL
387	* REL
388	* REL
389	* REL
390	* REL
391	*
392	*/
393
394	/**
395	* Get the symbol and symbol value.
396	*
397	* @returns iprt status code.
398	* @param pModElf The ELF loader module instance data.
399	* @param BaseAddr The base address which the module is being fixedup to.
400	* @param pfnGetImport The callback function to use to resolve imports (aka unresolved externals).
401	* @param pvUser User argument to pass to the callback.
402	* @param iSym The symbol to get.
403	* @param ppSym Where to store the symbol pointer on success. (read only)
404	* @param pSymValue Where to store the symbol value on success.
405	*/
406	static int RTLDRELF_NAME(Symbol)(PRTLDRMODELF pModElf, Elf_Addr BaseAddr, PFNRTLDRIMPORT pfnGetImport, void *pvUser,
407	Elf_Size iSym, const Elf_Sym *ppSym, Elf_Addr pSymValue)
408	{
409	/*
410	* Validate and find the symbol.
411	*/
412	if (iSym >= pModElf->cSyms)
413	{
414	AssertMsgFailed(("iSym=%d is an invalid symbol index!\n", iSym));
415	return VERR_LDRELF_INVALID_SYMBOL_INDEX;
416	}
417	const Elf_Sym *pSym = &pModElf->paSyms[iSym];
418	*ppSym = pSym;
419
420	if (pSym->st_name >= pModElf->cbStr)
421	{
422	AssertMsgFailed(("iSym=%d st_name=%d str sh_size=%d\n", iSym, pSym->st_name, pModElf->cbStr));
423	return VERR_LDRELF_INVALID_SYMBOL_NAME_OFFSET;
424	}
425	const char *pszName = ELF_STR(pModElf, pSym->st_name);
426
427	/*
428	* Determine the symbol value.
429	*
430	* Symbols needs different treatment depending on which section their are in.
431	* Undefined and absolute symbols goes into special non-existing sections.
432	*/
433	switch (pSym->st_shndx)
434	{
435	/*
436	* Undefined symbol, needs resolving.
437	*
438	* Since ELF has no generic concept of importing from specific module (the OS/2 ELF format
439	* has but that's a OS extension and only applies to programs and dlls), we'll have to ask
440	* the resolver callback to do a global search.
441	*/
442	case SHN_UNDEF:
443	{
444	/* Try to resolve the symbol. */
445	RTUINTPTR Value;
446	int rc = pfnGetImport(&pModElf->Core, "", pszName, ~0, &Value, pvUser);
447	if (RT_FAILURE(rc))
448	{
449	AssertMsgFailed(("Failed to resolve '%s' rc=%Rrc\n", pszName, rc));
450	return rc;
451	}
452	*pSymValue = (Elf_Addr)Value;
453	if ((RTUINTPTR)*pSymValue != Value)
454	{
455	AssertMsgFailed(("Symbol value overflowed! '%s'\n", pszName));
456	return VERR_SYMBOL_VALUE_TOO_BIG;
457	}
458
459	Log2(("rtldrELF: #%-3d - UNDEF " FMT_ELF_ADDR " '%s'\n", iSym, *pSymValue, pszName));
460	break;
461	}
462
463	/*
464	* Absolute symbols needs no fixing since they are, well, absolute.
465	*/
466	case SHN_ABS:
467	*pSymValue = pSym->st_value;
468	Log2(("rtldrELF: #%-3d - ABS " FMT_ELF_ADDR " '%s'\n", iSym, *pSymValue, pszName));
469	break;
470
471	/*
472	* All other symbols are addressed relative to their section and need to be fixed up.
473	*/
474	default:
475	if (pSym->st_shndx >= pModElf->Ehdr.e_shnum)
476	{
477	/* what about common symbols? */
478	AssertMsg(pSym->st_shndx < pModElf->Ehdr.e_shnum,
479	("iSym=%d st_shndx=%d e_shnum=%d pszName=%s\n", iSym, pSym->st_shndx, pModElf->Ehdr.e_shnum, pszName));
480	return VERR_BAD_EXE_FORMAT;
481	}
482	*pSymValue = pSym->st_value + pModElf->paShdrs[pSym->st_shndx].sh_addr + BaseAddr;
483	Log2(("rtldrELF: #%-3d - %5d " FMT_ELF_ADDR " '%s'\n", iSym, pSym->st_shndx, *pSymValue, pszName));
484	break;
485	}
486
487	return VINF_SUCCESS;
488	}
489
490
491	/**
492	* Applies the fixups for a sections.
493	*
494	* @returns iprt status code.
495	* @param pModElf The ELF loader module instance data.
496	* @param BaseAddr The base address which the module is being fixedup to.
497	* @param pfnGetImport The callback function to use to resolve imports (aka unresolved externals).
498	* @param pvUser User argument to pass to the callback.
499	* @param SecAddr The section address. This is the address the relocations are relative to.
500	* @param cbSec The section size. The relocations must be inside this.
501	* @param pu8SecBaseR Where we read section bits from.
502	* @param pu8SecBaseW Where we write section bits to.
503	* @param pvRelocs Pointer to where we read the relocations from.
504	* @param cbRelocs Size of the relocations.
505	*/
506	static int RTLDRELF_NAME(RelocateSection)(PRTLDRMODELF pModElf, Elf_Addr BaseAddr, PFNRTLDRIMPORT pfnGetImport, void *pvUser,
507	const Elf_Addr SecAddr, Elf_Size cbSec, const uint8_t pu8SecBaseR, uint8_t pu8SecBaseW,
508	const void *pvRelocs, Elf_Size cbRelocs)
509	{
510	#if ELF_MODE != 32
511	NOREF(pu8SecBaseR);
512	#endif
513
514	/*
515	* Iterate the relocations.
516	* The relocations are stored in an array of Elf32_Rel records and covers the entire relocation section.
517	*/
518	const Elf_Reloc paRels = (const Elf_Reloc )pvRelocs;
519	const unsigned iRelMax = (unsigned)(cbRelocs / sizeof(paRels[0]));
520	AssertMsgReturn(iRelMax == cbRelocs / sizeof(paRels[0]), (FMT_ELF_SIZE "\n", cbRelocs / sizeof(paRels[0])), VERR_IMAGE_TOO_BIG);
521	for (unsigned iRel = 0; iRel < iRelMax; iRel++)
522	{
523	/*
524	* Skip R_XXX_NONE entries early to avoid confusion in the symbol
525	* getter code.
526	*/
527	#if ELF_MODE == 32
528	if (ELF_R_TYPE(paRels[iRel].r_info) == R_386_NONE)
529	continue;
530	#elif ELF_MODE == 64
531	if (ELF_R_TYPE(paRels[iRel].r_info) == R_X86_64_NONE)
532	continue;
533	#endif
534
535
536	/*
537	* Get the symbol.
538	*/
539	const Elf_Sym pSym = NULL; / shut up gcc */
540	Elf_Addr SymValue = 0; /* shut up gcc-4 */
541	int rc = RTLDRELF_NAME(Symbol)(pModElf, BaseAddr, pfnGetImport, pvUser, ELF_R_SYM(paRels[iRel].r_info), &pSym, &SymValue);
542	if (RT_FAILURE(rc))
543	return rc;
544
545	Log3(("rtldrELF: " FMT_ELF_ADDR " %02x %06x - " FMT_ELF_ADDR " %3d %02x %s\n",
546	paRels[iRel].r_offset, ELF_R_TYPE(paRels[iRel].r_info), (unsigned)ELF_R_SYM(paRels[iRel].r_info),
547	SymValue, (unsigned)pSym->st_shndx, pSym->st_info, ELF_STR(pModElf, pSym->st_name)));
548
549	/*
550	* Apply the fixup.
551	*/
552	AssertMsgReturn(paRels[iRel].r_offset < cbSec, (FMT_ELF_ADDR " " FMT_ELF_SIZE "\n", paRels[iRel].r_offset, cbSec), VERR_LDRELF_INVALID_RELOCATION_OFFSET);
553	#if ELF_MODE == 32
554	const Elf_Addr pAddrR = (const Elf_Addr )(pu8SecBaseR + paRels[iRel].r_offset); /* Where to read the addend. */
555	#endif
556	Elf_Addr pAddrW = (Elf_Addr )(pu8SecBaseW + paRels[iRel].r_offset); /* Where to write the fixup. */
557	switch (ELF_R_TYPE(paRels[iRel].r_info))
558	{
559	#if ELF_MODE == 32
560	/*
561	* Absolute addressing.
562	*/
563	case R_386_32:
564	{
565	const Elf_Addr Value = SymValue + *pAddrR;
566	(uint32_t )pAddrW = Value;
567	Log4((FMT_ELF_ADDR": R_386_32 Value=" FMT_ELF_ADDR " SymValue=" FMT_ELF_ADDR "\n",
568	SecAddr + paRels[iRel].r_offset + BaseAddr, Value, SymValue));
569	break;
570	}
571
572	/*
573	* PC relative addressing.
574	*/
575	case R_386_PC32:
576	{
577	const Elf_Addr SourceAddr = SecAddr + paRels[iRel].r_offset + BaseAddr; /* Where the source really is. */
578	const Elf_Addr Value = SymValue + (uint32_t )pAddrR - SourceAddr;
579	(uint32_t )pAddrW = Value;
580	Log4((FMT_ELF_ADDR": R_386_PC32 Value=" FMT_ELF_ADDR " SymValue=" FMT_ELF_ADDR "\n",
581	SourceAddr, Value, SymValue));
582	break;
583	}
584
585	/* ignore */
586	case R_386_NONE:
587	break;
588
589	#elif ELF_MODE == 64
590
591	/*
592	* Absolute addressing
593	*/
594	case R_X86_64_64:
595	{
596	const Elf_Addr Value = SymValue + paRels[iRel].r_addend;
597	(uint64_t )pAddrW = Value;
598	Log4((FMT_ELF_ADDR": R_X86_64_64 Value=" FMT_ELF_ADDR " SymValue=" FMT_ELF_ADDR "\n",
599	SecAddr + paRels[iRel].r_offset + BaseAddr, Value, SymValue));
600	break;
601	}
602
603	/*
604	* Truncated 32-bit value (zero-extendedable to the 64-bit value).
605	*/
606	case R_X86_64_32:
607	{
608	const Elf_Addr Value = SymValue + paRels[iRel].r_addend;
609	(uint32_t )pAddrW = (uint32_t)Value;
610	Log4((FMT_ELF_ADDR": R_X86_64_32 Value=" FMT_ELF_ADDR " SymValue=" FMT_ELF_ADDR "\n",
611	SecAddr + paRels[iRel].r_offset + BaseAddr, Value, SymValue));
612	AssertMsgReturn((Elf_Addr)(uint32_t )pAddrW == Value, ("Value=" FMT_ELF_ADDR "\n", Value), VERR_SYMBOL_VALUE_TOO_BIG);
613	break;
614	}
615
616	/*
617	* Truncated 32-bit value (sign-extendedable to the 64-bit value).
618	*/
619	case R_X86_64_32S:
620	{
621	const Elf_Addr Value = SymValue + paRels[iRel].r_addend;
622	(int32_t )pAddrW = (int32_t)Value;
623	Log4((FMT_ELF_ADDR": R_X86_64_32S Value=" FMT_ELF_ADDR " SymValue=" FMT_ELF_ADDR "\n",
624	SecAddr + paRels[iRel].r_offset + BaseAddr, Value, SymValue));
625	AssertMsgReturn((Elf_Addr)(int32_t )pAddrW == Value, ("Value=" FMT_ELF_ADDR "\n", Value), VERR_SYMBOL_VALUE_TOO_BIG); /** @todo check the sign-extending here. */
626	break;
627	}
628
629	/*
630	* PC relative addressing.
631	*/
632	case R_X86_64_PC32:
633	{
634	const Elf_Addr SourceAddr = SecAddr + paRels[iRel].r_offset + BaseAddr; /* Where the source really is. */
635	const Elf_Addr Value = SymValue + paRels[iRel].r_addend - SourceAddr;
636	(int32_t )pAddrW = (int32_t)Value;
637	Log4((FMT_ELF_ADDR": R_X86_64_PC32 Value=" FMT_ELF_ADDR " SymValue=" FMT_ELF_ADDR "\n",
638	SourceAddr, Value, SymValue));
639	AssertMsgReturn((Elf_Addr)(int32_t )pAddrW == Value, ("Value=" FMT_ELF_ADDR "\n", Value), VERR_SYMBOL_VALUE_TOO_BIG); /** @todo check the sign-extending here. */
640	break;
641	}
642
643	/* ignore */
644	case R_X86_64_NONE:
645	break;
646	#endif
647
648	default:
649	AssertMsgFailed(("Unknown relocation type: %d (iRel=%d iRelMax=%d)\n",
650	ELF_R_TYPE(paRels[iRel].r_info), iRel, iRelMax));
651	return VERR_LDRELF_RELOCATION_NOT_SUPPORTED;
652	}
653	}
654
655	return VINF_SUCCESS;
656	}
657
658
659
660	/** @copydoc RTLDROPS::pfnClose */
661	static DECLCALLBACK(int) RTLDRELF_NAME(Close)(PRTLDRMODINTERNAL pMod)
662	{
663	PRTLDRMODELF pModElf = (PRTLDRMODELF)pMod;
664
665	if (pModElf->paShdrs)
666	{
667	RTMemFree(pModElf->paShdrs);
668	pModElf->paShdrs = NULL;
669	}
670
671	pModElf->pvBits = NULL;
672
673	return VINF_SUCCESS;
674	}
675
676
677	/** @copydoc RTLDROPS::Done */
678	static DECLCALLBACK(int) RTLDRELF_NAME(Done)(PRTLDRMODINTERNAL pMod)
679	{
680	NOREF(pMod); /PRTLDRMODELF pModElf = (PRTLDRMODELF)pMod;/
681	/** @todo Have to think more about this .... */
682	return -1;
683	}
684
685
686	/** @copydoc RTLDROPS::EnumSymbols */
687	static DECLCALLBACK(int) RTLDRELF_NAME(EnumSymbols)(PRTLDRMODINTERNAL pMod, unsigned fFlags, const void *pvBits, RTUINTPTR BaseAddress,
688	PFNRTLDRENUMSYMS pfnCallback, void *pvUser)
689	{
690	PRTLDRMODELF pModElf = (PRTLDRMODELF)pMod;
691	NOREF(pvBits);
692
693	/*
694	* Validate the input.
695	*/
696	Elf_Addr BaseAddr = (Elf_Addr)BaseAddress;
697	AssertMsgReturn((RTUINTPTR)BaseAddr == BaseAddress, ("#RTptr", BaseAddress), VERR_IMAGE_BASE_TOO_HIGH);
698
699	/*
700	* Make sure we've got the string and symbol tables. (We don't need the pvBits.)
701	*/
702	int rc = RTLDRELF_NAME(MapBits)(pModElf, false);
703	if (RT_FAILURE(rc))
704	return rc;
705
706	/*
707	* Enumerate the symbol table.
708	*/
709	const Elf_Sym *paSyms = pModElf->paSyms;
710	unsigned cSyms = pModElf->cSyms;
711	for (unsigned iSym = 1; iSym < cSyms; iSym++)
712	{
713	/*
714	* Skip imports (undefined).
715	*/
716	if (paSyms[iSym].st_shndx != SHN_UNDEF)
717	{
718	/*
719	* Calc value and get name.
720	*/
721	Elf_Addr Value;
722	if (paSyms[iSym].st_shndx == SHN_ABS)
723	/* absolute symbols are not subject to any relocation. */
724	Value = paSyms[iSym].st_value;
725	else if (paSyms[iSym].st_shndx < pModElf->Ehdr.e_shnum)
726	{
727	if (pModElf->Ehdr.e_type == ET_REL)
728	/* relative to the section. */
729	Value = BaseAddr + paSyms[iSym].st_value + pModElf->paShdrs[paSyms[iSym].st_shndx].sh_addr;
730	else /* Fixed up for link address. */
731	Value = BaseAddr + paSyms[iSym].st_value - pModElf->LinkAddress;
732	}
733	else
734	{
735	AssertMsgFailed(("Arg! paSyms[%u].st_shndx=" FMT_ELF_HALF "\n", iSym, paSyms[iSym].st_shndx));
736	return VERR_BAD_EXE_FORMAT;
737	}
738	const char *pszName = ELF_STR(pModElf, paSyms[iSym].st_name);
739	if ( (pszName && *pszName)
740	&& ( (fFlags & RTLDR_ENUM_SYMBOL_FLAGS_ALL)
741	\|\| ELF_ST_BIND(paSyms[iSym].st_info) == STB_GLOBAL)
742	)
743	{
744	/*
745	* Call back.
746	*/
747	AssertMsgReturn(Value == (RTUINTPTR)Value, (FMT_ELF_ADDR "\n", Value), VERR_SYMBOL_VALUE_TOO_BIG);
748	rc = pfnCallback(pMod, pszName, ~0, (RTUINTPTR)Value, pvUser);
749	if (rc)
750	return rc;
751	}
752	}
753	}
754
755	return VINF_SUCCESS;
756	}
757
758
759	/** @copydoc RTLDROPS::GetImageSize */
760	static DECLCALLBACK(size_t) RTLDRELF_NAME(GetImageSize)(PRTLDRMODINTERNAL pMod)
761	{
762	PRTLDRMODELF pModElf = (PRTLDRMODELF)pMod;
763
764	return pModElf->cbImage;
765	}
766
767
768	/** @copydoc RTLDROPS::GetBits */
769	static DECLCALLBACK(int) RTLDRELF_NAME(GetBits)(PRTLDRMODINTERNAL pMod, void pvBits, RTUINTPTR BaseAddress, PFNRTLDRIMPORT pfnGetImport, void pvUser)
770	{
771	PRTLDRMODELF pModElf = (PRTLDRMODELF)pMod;
772
773	/*
774	* This operation is currently only available on relocatable images.
775	*/
776	switch (pModElf->Ehdr.e_type)
777	{
778	case ET_REL:
779	break;
780	case ET_EXEC:
781	Log(("RTLdrELF: %s: Executable images are not supported yet!\n", pModElf->Core.pReader->pfnLogName(pModElf->Core.pReader)));
782	return VERR_LDRELF_EXEC;
783	case ET_DYN:
784	Log(("RTLdrELF: %s: Dynamic images are not supported yet!\n", pModElf->Core.pReader->pfnLogName(pModElf->Core.pReader)));
785	return VERR_LDRELF_DYN;
786	default: AssertFailedReturn(VERR_BAD_EXE_FORMAT);
787	}
788
789	/*
790	* Load the bits into pvBits.
791	*/
792	const Elf_Shdr *paShdrs = pModElf->paShdrs;
793	for (unsigned iShdr = 0; iShdr < pModElf->Ehdr.e_shnum; iShdr++)
794	{
795	if (paShdrs[iShdr].sh_flags & SHF_ALLOC)
796	{
797	AssertMsgReturn((size_t)paShdrs[iShdr].sh_size == (size_t)paShdrs[iShdr].sh_size, (FMT_ELF_SIZE "\n", paShdrs[iShdr].sh_size), VERR_IMAGE_TOO_BIG);
798	switch (paShdrs[iShdr].sh_type)
799	{
800	case SHT_NOBITS:
801	memset((uint8_t *)pvBits + paShdrs[iShdr].sh_addr, 0, (size_t)paShdrs[iShdr].sh_size);
802	break;
803
804	case SHT_PROGBITS:
805	default:
806	{
807	int rc = pModElf->Core.pReader->pfnRead(pModElf->Core.pReader, (uint8_t *)pvBits + paShdrs[iShdr].sh_addr,
808	(size_t)paShdrs[iShdr].sh_size, paShdrs[iShdr].sh_offset);
809	if (RT_FAILURE(rc))
810	{
811	Log(("RTLdrELF: %s: Read error when reading " FMT_ELF_SIZE " bytes at " FMT_ELF_OFF ", iShdr=%d\n",
812	pModElf->Core.pReader->pfnLogName(pModElf->Core.pReader),
813	paShdrs[iShdr].sh_size, paShdrs[iShdr].sh_offset, iShdr));
814	return rc;
815	}
816	}
817	}
818	}
819	}
820
821	/*
822	* Relocate the image.
823	*/
824	return pModElf->Core.pOps->pfnRelocate(pMod, pvBits, BaseAddress, ~(RTUINTPTR)0, pfnGetImport, pvUser);
825	}
826
827
828	/** @copydoc RTLDROPS::Relocate */
829	static DECLCALLBACK(int) RTLDRELF_NAME(Relocate)(PRTLDRMODINTERNAL pMod, void *pvBits, RTUINTPTR NewBaseAddress,
830	RTUINTPTR OldBaseAddress, PFNRTLDRIMPORT pfnGetImport, void *pvUser)
831	{
832	PRTLDRMODELF pModElf = (PRTLDRMODELF)pMod;
833	#ifdef LOG_ENABLED
834	const char *pszLogName = pModElf->Core.pReader->pfnLogName(pModElf->Core.pReader);
835	#endif
836	NOREF(OldBaseAddress);
837
838	/*
839	* This operation is currently only available on relocatable images.
840	*/
841	switch (pModElf->Ehdr.e_type)
842	{
843	case ET_REL:
844	break;
845	case ET_EXEC:
846	Log(("RTLdrELF: %s: Executable images are not supported yet!\n", pszLogName));
847	return VERR_LDRELF_EXEC;
848	case ET_DYN:
849	Log(("RTLdrELF: %s: Dynamic images are not supported yet!\n", pszLogName));
850	return VERR_LDRELF_DYN;
851	default: AssertFailedReturn(VERR_BAD_EXE_FORMAT);
852	}
853
854	/*
855	* Validate the input.
856	*/
857	Elf_Addr BaseAddr = (Elf_Addr)NewBaseAddress;
858	AssertMsgReturn((RTUINTPTR)BaseAddr == NewBaseAddress, ("#RTptr", NewBaseAddress), VERR_IMAGE_BASE_TOO_HIGH);
859
860	/*
861	* Map the image bits if not already done and setup pointer into it.
862	*/
863	int rc = RTLDRELF_NAME(MapBits)(pModElf, true);
864	if (RT_FAILURE(rc))
865	return rc;
866
867	/*
868	* Iterate the sections looking for interesting SHT_REL[A] sections.
869	* SHT_REL[A] sections have the section index of the section they contain fixups
870	* for in the sh_info member.
871	*/
872	const Elf_Shdr *paShdrs = pModElf->paShdrs;
873	Log2(("rtLdrElf: %s: Fixing up image\n", pszLogName));
874	for (unsigned iShdr = 0; iShdr < pModElf->Ehdr.e_shnum; iShdr++)
875	{
876	const Elf_Shdr *pShdrRel = &paShdrs[iShdr];
877
878	/*
879	* Skip sections without interest to us.
880	*/
881	#if ELF_MODE == 32
882	if (pShdrRel->sh_type != SHT_REL)
883	#else
884	if (pShdrRel->sh_type != SHT_RELA)
885	#endif
886	continue;
887	if (pShdrRel->sh_info >= pModElf->Ehdr.e_shnum)
888	continue;
889	const Elf_Shdr pShdr = &paShdrs[pShdrRel->sh_info]; / the section to fixup. */
890	if (!(pShdr->sh_flags & SHF_ALLOC))
891	continue;
892
893	/*
894	* Relocate the section.
895	*/
896	Log2(("rtldrELF: %s: Relocation records for #%d [%s] (sh_info=%d sh_link=%d) found in #%d [%s] (sh_info=%d sh_link=%d)\n",
897	pszLogName, (int)pShdrRel->sh_info, ELF_SH_STR(pModElf, pShdr->sh_name), (int)pShdr->sh_info, (int)pShdr->sh_link,
898	iShdr, ELF_SH_STR(pModElf, pShdrRel->sh_name), (int)pShdrRel->sh_info, (int)pShdrRel->sh_link));
899
900	/** @todo Make RelocateSection a function pointer so we can select the one corresponding to the machine when opening the image. */
901	if (pModElf->Ehdr.e_type == ET_REL)
902	rc = RTLDRELF_NAME(RelocateSection)(pModElf, BaseAddr, pfnGetImport, pvUser,
903	pShdr->sh_addr,
904	pShdr->sh_size,
905	(const uint8_t *)pModElf->pvBits + pShdr->sh_offset,
906	(uint8_t *)pvBits + pShdr->sh_addr,
907	(const uint8_t *)pModElf->pvBits + pShdrRel->sh_offset,
908	pShdrRel->sh_size);
909	else
910	rc = RTLDRELF_NAME(RelocateSectionExecDyn)(pModElf, BaseAddr, pfnGetImport, pvUser,
911	pShdr->sh_addr,
912	pShdr->sh_size,
913	(const uint8_t *)pModElf->pvBits + pShdr->sh_offset,
914	(uint8_t *)pvBits + pShdr->sh_addr,
915	(const uint8_t *)pModElf->pvBits + pShdrRel->sh_offset,
916	pShdrRel->sh_size);
917	if (RT_FAILURE(rc))
918	return rc;
919	}
920	return VINF_SUCCESS;
921	}
922
923
924	/**
925	* Worker for pfnGetSymbolEx.
926	*/
927	static int RTLDRELF_NAME(ReturnSymbol)(PRTLDRMODELF pThis, const Elf_Sym *pSym, Elf_Addr uBaseAddr, PRTUINTPTR pValue)
928	{
929	Elf_Addr Value;
930	if (pSym->st_shndx == SHN_ABS)
931	/* absolute symbols are not subject to any relocation. */
932	Value = pSym->st_value;
933	else if (pSym->st_shndx < pThis->Ehdr.e_shnum)
934	{
935	if (pThis->Ehdr.e_type == ET_REL)
936	/* relative to the section. */
937	Value = uBaseAddr + pSym->st_value + pThis->paShdrs[pSym->st_shndx].sh_addr;
938	else /* Fixed up for link address. */
939	Value = uBaseAddr + pSym->st_value - pThis->LinkAddress;
940	}
941	else
942	{
943	AssertMsgFailed(("Arg! pSym->st_shndx=%d\n", pSym->st_shndx));
944	return VERR_BAD_EXE_FORMAT;
945	}
946	AssertMsgReturn(Value == (RTUINTPTR)Value, (FMT_ELF_ADDR "\n", Value), VERR_SYMBOL_VALUE_TOO_BIG);
947	*pValue = (RTUINTPTR)Value;
948	return VINF_SUCCESS;
949	}
950
951
952	/** @copydoc RTLDROPS::pfnGetSymbolEx */
953	static DECLCALLBACK(int) RTLDRELF_NAME(GetSymbolEx)(PRTLDRMODINTERNAL pMod, const void *pvBits, RTUINTPTR BaseAddress,
954	uint32_t iOrdinal, const char pszSymbol, RTUINTPTR pValue)
955	{
956	PRTLDRMODELF pModElf = (PRTLDRMODELF)pMod;
957	NOREF(pvBits);
958
959	/*
960	* Validate the input.
961	*/
962	Elf_Addr uBaseAddr = (Elf_Addr)BaseAddress;
963	AssertMsgReturn((RTUINTPTR)uBaseAddr == BaseAddress, ("#RTptr", BaseAddress), VERR_IMAGE_BASE_TOO_HIGH);
964
965	/*
966	* Map the image bits if not already done and setup pointer into it.
967	*/
968	int rc = RTLDRELF_NAME(MapBits)(pModElf, true);
969	if (RT_FAILURE(rc))
970	return rc;
971
972	/*
973	* Calc all kinds of pointers before we start iterating the symbol table.
974	*/
975	const Elf_Sym *paSyms = pModElf->paSyms;
976	unsigned cSyms = pModElf->cSyms;
977	if (iOrdinal == UINT32_MAX)
978	{
979	const char *pStr = pModElf->pStr;
980	for (unsigned iSym = 1; iSym < cSyms; iSym++)
981	{
982	/* Undefined symbols are not exports, they are imports. */
983	if ( paSyms[iSym].st_shndx != SHN_UNDEF
984	&& ( ELF_ST_BIND(paSyms[iSym].st_info) == STB_GLOBAL
985	\|\| ELF_ST_BIND(paSyms[iSym].st_info) == STB_WEAK))
986	{
987	/* Validate the name string and try match with it. */
988	if (paSyms[iSym].st_name < pModElf->cbStr)
989	{
990	if (!strcmp(pszSymbol, pStr + paSyms[iSym].st_name))
991	{
992	/* matched! */
993	return RTLDRELF_NAME(ReturnSymbol)(pModElf, &paSyms[iSym], uBaseAddr, pValue);
994	}
995	}
996	else
997	{
998	AssertMsgFailed(("String outside string table! iSym=%d paSyms[iSym].st_name=%#x\n", iSym, paSyms[iSym].st_name));
999	return VERR_LDRELF_INVALID_SYMBOL_NAME_OFFSET;
1000	}
1001	}
1002	}
1003	}
1004	else if (iOrdinal < cSyms)
1005	{
1006	if ( paSyms[iOrdinal].st_shndx != SHN_UNDEF
1007	&& ( ELF_ST_BIND(paSyms[iOrdinal].st_info) == STB_GLOBAL
1008	\|\| ELF_ST_BIND(paSyms[iOrdinal].st_info) == STB_WEAK))
1009	return RTLDRELF_NAME(ReturnSymbol)(pModElf, &paSyms[iOrdinal], uBaseAddr, pValue);
1010	}
1011
1012	return VERR_SYMBOL_NOT_FOUND;
1013	}
1014
1015
1016	/** @copydoc RTLDROPS::pfnEnumDbgInfo */
1017	static DECLCALLBACK(int) RTLDRELF_NAME(EnumDbgInfo)(PRTLDRMODINTERNAL pMod, const void *pvBits,
1018	PFNRTLDRENUMDBG pfnCallback, void *pvUser)
1019	{
1020	PRTLDRMODELF pModElf = (PRTLDRMODELF)pMod;
1021
1022	/*
1023	* Map the image bits if not already done and setup pointer into it.
1024	*/
1025	int rc = RTLDRELF_NAME(MapBits)(pModElf, true);
1026	if (RT_FAILURE(rc))
1027	return rc;
1028
1029	/*
1030	* Do the enumeration.
1031	*/
1032	const Elf_Shdr *paShdrs = pModElf->paOrgShdrs;
1033	for (unsigned iShdr = 0; iShdr < pModElf->Ehdr.e_shnum; iShdr++)
1034	{
1035	/* Debug sections are expected to be PROGBITS and not allocated. */
1036	if (paShdrs[iShdr].sh_type != SHT_PROGBITS)
1037	continue;
1038	if (paShdrs[iShdr].sh_flags & SHF_ALLOC)
1039	continue;
1040
1041	RTLDRDBGINFO DbgInfo;
1042	const char *pszSectName = ELF_SH_STR(pModElf, paShdrs[iShdr].sh_name);
1043	if ( !strncmp(pszSectName, RT_STR_TUPLE(".debug_"))
1044	\|\| !strcmp(pszSectName, ".WATCOM_references") )
1045	{
1046	RT_ZERO(DbgInfo.u);
1047	DbgInfo.enmType = RTLDRDBGINFOTYPE_DWARF;
1048	DbgInfo.pszExtFile = NULL;
1049	DbgInfo.offFile = paShdrs[iShdr].sh_offset;
1050	DbgInfo.cb = paShdrs[iShdr].sh_size;
1051	DbgInfo.u.Dwarf.pszSection = pszSectName;
1052	}
1053	else if (!strcmp(pszSectName, ".gnu_debuglink"))
1054	{
1055	if ((paShdrs[iShdr].sh_size & 3) \|\| paShdrs[iShdr].sh_size < 8)
1056	return VERR_BAD_EXE_FORMAT;
1057
1058	RT_ZERO(DbgInfo.u);
1059	DbgInfo.enmType = RTLDRDBGINFOTYPE_DWARF_DWO;
1060	DbgInfo.pszExtFile = (const char *)((uintptr_t)pModElf->pvBits + (uintptr_t)paShdrs[iShdr].sh_offset);
1061	if (!RTStrEnd(DbgInfo.pszExtFile, paShdrs[iShdr].sh_size))
1062	return VERR_BAD_EXE_FORMAT;
1063	DbgInfo.u.Dwo.uCrc32 = (uint32_t )((uintptr_t)DbgInfo.pszExtFile + (uintptr_t)paShdrs[iShdr].sh_size
1064	- sizeof(uint32_t));
1065	DbgInfo.offFile = -1;
1066	DbgInfo.cb = 0;
1067	}
1068	else
1069	continue;
1070
1071	DbgInfo.LinkAddress = NIL_RTLDRADDR;
1072	DbgInfo.iDbgInfo = iShdr - 1;
1073
1074	rc = pfnCallback(pMod, &DbgInfo, pvUser);
1075	if (rc != VINF_SUCCESS)
1076	return rc;
1077
1078	}
1079
1080	return VINF_SUCCESS;
1081	}
1082
1083
1084	/**
1085	* Helper that locates the first allocated section.
1086	*
1087	* @returns Pointer to the section header if found, NULL if none.
1088	* @param pShdr The section header to start searching at.
1089	* @param cLeft The number of section headers left to search. Can be 0.
1090	*/
1091	static const Elf_Shdr RTLDRELF_NAME(GetFirstAllocatedSection)(const Elf_Shdr pShdr, unsigned cLeft)
1092	{
1093	while (cLeft-- > 0)
1094	{
1095	if (pShdr->sh_flags & SHF_ALLOC)
1096	return pShdr;
1097	pShdr++;
1098	}
1099	return NULL;
1100	}
1101
1102	/** @copydoc RTLDROPS::pfnEnumSegments. */
1103	static DECLCALLBACK(int) RTLDRELF_NAME(EnumSegments)(PRTLDRMODINTERNAL pMod, PFNRTLDRENUMSEGS pfnCallback, void *pvUser)
1104	{
1105	PRTLDRMODELF pModElf = (PRTLDRMODELF)pMod;
1106
1107	/*
1108	* Map the image bits if not already done and setup pointer into it.
1109	*/
1110	int rc = RTLDRELF_NAME(MapBits)(pModElf, true);
1111	if (RT_FAILURE(rc))
1112	return rc;
1113
1114	/*
1115	* Do the enumeration.
1116	*/
1117	char szName[32];
1118	Elf_Addr uPrevMappedRva = 0;
1119	const Elf_Shdr *paShdrs = pModElf->paShdrs;
1120	const Elf_Shdr *paOrgShdrs = pModElf->paOrgShdrs;
1121	for (unsigned iShdr = 1; iShdr < pModElf->Ehdr.e_shnum; iShdr++)
1122	{
1123	RTLDRSEG Seg;
1124	Seg.pszName = ELF_SH_STR(pModElf, paShdrs[iShdr].sh_name);
1125	Seg.cchName = (uint32_t)strlen(Seg.pszName);
1126	if (Seg.cchName == 0)
1127	{
1128	Seg.pszName = szName;
1129	Seg.cchName = (uint32_t)RTStrPrintf(szName, sizeof(szName), "UnamedSect%02u", iShdr);
1130	}
1131	Seg.SelFlat = 0;
1132	Seg.Sel16bit = 0;
1133	Seg.fFlags = 0;
1134	Seg.fProt = RTMEM_PROT_READ;
1135	if (paShdrs[iShdr].sh_flags & SHF_WRITE)
1136	Seg.fProt \|= RTMEM_PROT_WRITE;
1137	if (paShdrs[iShdr].sh_flags & SHF_EXECINSTR)
1138	Seg.fProt \|= RTMEM_PROT_EXEC;
1139	Seg.cb = paShdrs[iShdr].sh_size;
1140	Seg.Alignment = paShdrs[iShdr].sh_addralign;
1141	if (paShdrs[iShdr].sh_flags & SHF_ALLOC)
1142	{
1143	Seg.LinkAddress = paOrgShdrs[iShdr].sh_addr;
1144	Seg.RVA = paShdrs[iShdr].sh_addr;
1145	const Elf_Shdr *pShdr2 = RTLDRELF_NAME(GetFirstAllocatedSection)(&paShdrs[iShdr + 1],
1146	pModElf->Ehdr.e_shnum - iShdr - 1);
1147	if ( pShdr2
1148	&& pShdr2->sh_addr >= paShdrs[iShdr].sh_addr
1149	&& Seg.RVA >= uPrevMappedRva)
1150	Seg.cbMapped = pShdr2->sh_addr - paShdrs[iShdr].sh_addr;
1151	else
1152	Seg.cbMapped = RT_MAX(paShdrs[iShdr].sh_size, paShdrs[iShdr].sh_addralign);
1153	uPrevMappedRva = Seg.RVA;
1154	}
1155	else
1156	{
1157	Seg.LinkAddress = NIL_RTLDRADDR;
1158	Seg.RVA = NIL_RTLDRADDR;
1159	Seg.cbMapped = NIL_RTLDRADDR;
1160	}
1161	if (paShdrs[iShdr].sh_type != SHT_NOBITS)
1162	{
1163	Seg.offFile = paShdrs[iShdr].sh_offset;
1164	Seg.cbFile = paShdrs[iShdr].sh_size;
1165	}
1166	else
1167	{
1168	Seg.offFile = -1;
1169	Seg.cbFile = 0;
1170	}
1171
1172	rc = pfnCallback(pMod, &Seg, pvUser);
1173	if (rc != VINF_SUCCESS)
1174	return rc;
1175	}
1176
1177	return VINF_SUCCESS;
1178	}
1179
1180
1181	/** @copydoc RTLDROPS::pfnLinkAddressToSegOffset. */
1182	static DECLCALLBACK(int) RTLDRELF_NAME(LinkAddressToSegOffset)(PRTLDRMODINTERNAL pMod, RTLDRADDR LinkAddress,
1183	uint32_t *piSeg, PRTLDRADDR poffSeg)
1184	{
1185	PRTLDRMODELF pModElf = (PRTLDRMODELF)pMod;
1186
1187	const Elf_Shdr *pShdrEnd = NULL;
1188	unsigned cLeft = pModElf->Ehdr.e_shnum - 1;
1189	const Elf_Shdr *pShdr = &pModElf->paOrgShdrs[cLeft];
1190	while (cLeft-- > 0)
1191	{
1192	if (pShdr->sh_flags & SHF_ALLOC)
1193	{
1194	RTLDRADDR offSeg = LinkAddress - pShdr->sh_addr;
1195	if (offSeg < pShdr->sh_size)
1196	{
1197	*poffSeg = offSeg;
1198	*piSeg = cLeft;
1199	return VINF_SUCCESS;
1200	}
1201	if (offSeg == pShdr->sh_size)
1202	pShdrEnd = pShdr;
1203	}
1204	pShdr--;
1205	}
1206
1207	if (pShdrEnd)
1208	{
1209	*poffSeg = pShdrEnd->sh_size;
1210	*piSeg = pShdrEnd - pModElf->paOrgShdrs - 1;
1211	return VINF_SUCCESS;
1212	}
1213
1214	return VERR_LDR_INVALID_LINK_ADDRESS;
1215	}
1216
1217
1218	/** @copydoc RTLDROPS::pfnLinkAddressToRva. */
1219	static DECLCALLBACK(int) RTLDRELF_NAME(LinkAddressToRva)(PRTLDRMODINTERNAL pMod, RTLDRADDR LinkAddress, PRTLDRADDR pRva)
1220	{
1221	PRTLDRMODELF pModElf = (PRTLDRMODELF)pMod;
1222	uint32_t iSeg;
1223	RTLDRADDR offSeg;
1224	int rc = RTLDRELF_NAME(LinkAddressToSegOffset)(pMod, LinkAddress, &iSeg, &offSeg);
1225	if (RT_SUCCESS(rc))
1226	*pRva = pModElf->paShdrs[iSeg + 1].sh_addr + offSeg;
1227	return rc;
1228	}
1229
1230
1231	/** @copydoc RTLDROPS::pfnSegOffsetToRva. */
1232	static DECLCALLBACK(int) RTLDRELF_NAME(SegOffsetToRva)(PRTLDRMODINTERNAL pMod, uint32_t iSeg, RTLDRADDR offSeg,
1233	PRTLDRADDR pRva)
1234	{
1235	PRTLDRMODELF pModElf = (PRTLDRMODELF)pMod;
1236	if (iSeg >= pModElf->Ehdr.e_shnum - 1U)
1237	return VERR_LDR_INVALID_SEG_OFFSET;
1238
1239	iSeg++; /* skip section 0 */
1240	if (offSeg > pModElf->paShdrs[iSeg].sh_size)
1241	{
1242	const Elf_Shdr *pShdr2 = RTLDRELF_NAME(GetFirstAllocatedSection)(&pModElf->paShdrs[iSeg + 1],
1243	pModElf->Ehdr.e_shnum - iSeg - 1);
1244	if ( !pShdr2
1245	\|\| offSeg > (pShdr2->sh_addr - pModElf->paShdrs[iSeg].sh_addr))
1246	return VERR_LDR_INVALID_SEG_OFFSET;
1247	}
1248
1249	if (!(pModElf->paShdrs[iSeg].sh_flags & SHF_ALLOC))
1250	return VERR_LDR_INVALID_SEG_OFFSET;
1251
1252	*pRva = pModElf->paShdrs[iSeg].sh_addr;
1253	return VINF_SUCCESS;
1254	}
1255
1256
1257	/** @copydoc RTLDROPS::pfnRvaToSegOffset. */
1258	static DECLCALLBACK(int) RTLDRELF_NAME(RvaToSegOffset)(PRTLDRMODINTERNAL pMod, RTLDRADDR Rva,
1259	uint32_t *piSeg, PRTLDRADDR poffSeg)
1260	{
1261	PRTLDRMODELF pModElf = (PRTLDRMODELF)pMod;
1262
1263	Elf_Addr PrevAddr = 0;
1264	unsigned cLeft = pModElf->Ehdr.e_shnum - 1;
1265	const Elf_Shdr *pShdr = &pModElf->paShdrs[cLeft];
1266	while (cLeft-- > 0)
1267	{
1268	if (pShdr->sh_flags & SHF_ALLOC)
1269	{
1270	Elf_Addr cbSeg = PrevAddr ? PrevAddr - pShdr->sh_addr : pShdr->sh_size;
1271	RTLDRADDR offSeg = Rva - pShdr->sh_addr;
1272	if (offSeg <= cbSeg)
1273	{
1274	*poffSeg = offSeg;
1275	*piSeg = cLeft;
1276	return VINF_SUCCESS;
1277	}
1278	PrevAddr = pShdr->sh_addr;
1279	}
1280	pShdr--;
1281	}
1282
1283	return VERR_LDR_INVALID_RVA;
1284	}
1285
1286
1287	/** @callback_method_impl{FNRTLDRIMPORT, Stub used by ReadDbgInfo.} */
1288	static DECLCALLBACK(int) RTLDRELF_NAME(GetImportStubCallback)(RTLDRMOD hLdrMod, const char pszModule, const char pszSymbol,
1289	unsigned uSymbol, PRTLDRADDR pValue, void *pvUser)
1290	{
1291	return VERR_SYMBOL_NOT_FOUND;
1292	}
1293
1294
1295	/** @copydoc RTLDROPS::pfnRvaToSegOffset. */
1296	static DECLCALLBACK(int) RTLDRELF_NAME(ReadDbgInfo)(PRTLDRMODINTERNAL pMod, uint32_t iDbgInfo, RTFOFF off,
1297	size_t cb, void *pvBuf)
1298	{
1299	PRTLDRMODELF pThis = (PRTLDRMODELF)pMod;
1300	LogFlow(("%s: iDbgInfo=%#x off=%RTfoff cb=%#zu\n", __FUNCTION__, iDbgInfo, off, cb));
1301
1302	/*
1303	* Input validation.
1304	*/
1305	AssertReturn(iDbgInfo < pThis->Ehdr.e_shnum && iDbgInfo + 1 < pThis->Ehdr.e_shnum, VERR_INVALID_PARAMETER);
1306	iDbgInfo++;
1307	AssertReturn(!(pThis->paShdrs[iDbgInfo].sh_flags & SHF_ALLOC), VERR_INVALID_PARAMETER);
1308	AssertReturn(pThis->paShdrs[iDbgInfo].sh_type == SHT_PROGBITS, VERR_INVALID_PARAMETER);
1309	AssertReturn(pThis->paShdrs[iDbgInfo].sh_offset == (uint64_t)off, VERR_INVALID_PARAMETER);
1310	AssertReturn(pThis->paShdrs[iDbgInfo].sh_size == cb, VERR_INVALID_PARAMETER);
1311	RTFOFF cbRawImage = pThis->Core.pReader->pfnSize(pThis->Core.pReader);
1312	AssertReturn(cbRawImage >= 0, VERR_INVALID_PARAMETER);
1313	AssertReturn(off >= 0 && cb <= (uint64_t)cbRawImage && (uint64_t)off + cb <= (uint64_t)cbRawImage, VERR_INVALID_PARAMETER);
1314
1315	/*
1316	* Read it from the file and look for fixup sections.
1317	*/
1318	int rc;
1319	if (pThis->pvBits)
1320	memcpy(pvBuf, (const uint8_t *)pThis->pvBits + (size_t)off, cb);
1321	else
1322	{
1323	rc = pThis->Core.pReader->pfnRead(pThis->Core.pReader, pvBuf, cb, off);
1324	if (RT_FAILURE(rc))
1325	return rc;
1326	}
1327
1328	uint32_t iRelocs = iDbgInfo + 1;
1329	if ( iRelocs >= pThis->Ehdr.e_shnum
1330	\|\| pThis->paShdrs[iRelocs].sh_info != iDbgInfo
1331	\|\| ( pThis->paShdrs[iRelocs].sh_type != SHT_REL
1332	&& pThis->paShdrs[iRelocs].sh_type != SHT_RELA) )
1333	{
1334	iRelocs = 0;
1335	while ( iRelocs < pThis->Ehdr.e_shnum
1336	&& ( pThis->paShdrs[iRelocs].sh_info != iDbgInfo
1337	\|\| ( pThis->paShdrs[iRelocs].sh_type != SHT_REL
1338	&& pThis->paShdrs[iRelocs].sh_type != SHT_RELA)) )
1339	iRelocs++;
1340	}
1341	if ( iRelocs < pThis->Ehdr.e_shnum
1342	&& pThis->paShdrs[iRelocs].sh_size > 0)
1343	{
1344	/*
1345	* Load the relocations.
1346	*/
1347	uint8_t *pbRelocsBuf = NULL;
1348	const uint8_t *pbRelocs;
1349	if (pThis->pvBits)
1350	pbRelocs = (const uint8_t *)pThis->pvBits + pThis->paShdrs[iRelocs].sh_offset;
1351	else
1352	{
1353	pbRelocs = pbRelocsBuf = (uint8_t *)RTMemTmpAlloc(pThis->paShdrs[iRelocs].sh_size);
1354	if (!pbRelocsBuf)
1355	return VERR_NO_TMP_MEMORY;
1356	rc = pThis->Core.pReader->pfnRead(pThis->Core.pReader, pbRelocsBuf,
1357	pThis->paShdrs[iRelocs].sh_size,
1358	pThis->paShdrs[iRelocs].sh_offset);
1359	if (RT_FAILURE(rc))
1360	{
1361	RTMemTmpFree(pbRelocsBuf);
1362	return rc;
1363	}
1364	}
1365
1366	/*
1367	* Apply the relocations.
1368	*/
1369	if (pThis->Ehdr.e_type == ET_REL)
1370	rc = RTLDRELF_NAME(RelocateSection)(pThis, pThis->LinkAddress,
1371	RTLDRELF_NAME(GetImportStubCallback), NULL /pvUser/,
1372	pThis->paShdrs[iDbgInfo].sh_addr,
1373	pThis->paShdrs[iDbgInfo].sh_size,
1374	(const uint8_t *)pvBuf,
1375	(uint8_t *)pvBuf,
1376	pbRelocs,
1377	pThis->paShdrs[iRelocs].sh_size);
1378	else
1379	rc = RTLDRELF_NAME(RelocateSectionExecDyn)(pThis, pThis->LinkAddress,
1380	RTLDRELF_NAME(GetImportStubCallback), NULL /pvUser/,
1381	pThis->paShdrs[iDbgInfo].sh_addr,
1382	pThis->paShdrs[iDbgInfo].sh_size,
1383	(const uint8_t *)pvBuf,
1384	(uint8_t *)pvBuf,
1385	pbRelocs,
1386	pThis->paShdrs[iRelocs].sh_size);
1387
1388	RTMemTmpFree(pbRelocsBuf);
1389	}
1390	else
1391	rc = VINF_SUCCESS;
1392	return rc;
1393	}
1394
1395
1396
1397	/**
1398	* The ELF module operations.
1399	*/
1400	static RTLDROPS RTLDRELF_MID(s_rtldrElf,Ops) =
1401	{
1402	#if ELF_MODE == 32
1403	"elf32",
1404	#elif ELF_MODE == 64
1405	"elf64",
1406	#endif
1407	RTLDRELF_NAME(Close),
1408	NULL, /* Get Symbol */
1409	RTLDRELF_NAME(Done),
1410	RTLDRELF_NAME(EnumSymbols),
1411	/* ext: */
1412	RTLDRELF_NAME(GetImageSize),
1413	RTLDRELF_NAME(GetBits),
1414	RTLDRELF_NAME(Relocate),
1415	RTLDRELF_NAME(GetSymbolEx),
1416	NULL /pfnQueryForwarderInfo/,
1417	RTLDRELF_NAME(EnumDbgInfo),
1418	RTLDRELF_NAME(EnumSegments),
1419	RTLDRELF_NAME(LinkAddressToSegOffset),
1420	RTLDRELF_NAME(LinkAddressToRva),
1421	RTLDRELF_NAME(SegOffsetToRva),
1422	RTLDRELF_NAME(RvaToSegOffset),
1423	RTLDRELF_NAME(ReadDbgInfo),
1424	NULL /pfnQueryProp/,
1425	NULL /pfnVerifySignature/,
1426	NULL /pfnHashImage/,
1427	42
1428	};
1429
1430
1431
1432	/**
1433	* Validates the ELF header.
1434	*
1435	* @returns iprt status code.
1436	* @param pEhdr Pointer to the ELF header.
1437	* @param pszLogName The log name.
1438	* @param cbRawImage The size of the raw image.
1439	*/
1440	static int RTLDRELF_NAME(ValidateElfHeader)(const Elf_Ehdr pEhdr, const char pszLogName, uint64_t cbRawImage,
1441	PRTLDRARCH penmArch)
1442	{
1443	Log3(("RTLdrELF: e_ident: %.*Rhxs\n"
1444	"RTLdrELF: e_type: " FMT_ELF_HALF "\n"
1445	"RTLdrELF: e_version: " FMT_ELF_HALF "\n"
1446	"RTLdrELF: e_entry: " FMT_ELF_ADDR "\n"
1447	"RTLdrELF: e_phoff: " FMT_ELF_OFF "\n"
1448	"RTLdrELF: e_shoff: " FMT_ELF_OFF "\n"
1449	"RTLdrELF: e_flags: " FMT_ELF_WORD "\n"
1450	"RTLdrELF: e_ehsize: " FMT_ELF_HALF "\n"
1451	"RTLdrELF: e_phentsize: " FMT_ELF_HALF "\n"
1452	"RTLdrELF: e_phnum: " FMT_ELF_HALF "\n"
1453	"RTLdrELF: e_shentsize: " FMT_ELF_HALF "\n"
1454	"RTLdrELF: e_shnum: " FMT_ELF_HALF "\n"
1455	"RTLdrELF: e_shstrndx: " FMT_ELF_HALF "\n",
1456	RT_ELEMENTS(pEhdr->e_ident), &pEhdr->e_ident[0], pEhdr->e_type, pEhdr->e_version,
1457	pEhdr->e_entry, pEhdr->e_phoff, pEhdr->e_shoff,pEhdr->e_flags, pEhdr->e_ehsize, pEhdr->e_phentsize,
1458	pEhdr->e_phnum, pEhdr->e_shentsize, pEhdr->e_shnum, pEhdr->e_shstrndx));
1459
1460	if ( pEhdr->e_ident[EI_MAG0] != ELFMAG0
1461	\|\| pEhdr->e_ident[EI_MAG1] != ELFMAG1
1462	\|\| pEhdr->e_ident[EI_MAG2] != ELFMAG2
1463	\|\| pEhdr->e_ident[EI_MAG3] != ELFMAG3
1464	)
1465	{
1466	Log(("RTLdrELF: %s: Invalid ELF magic (%.*Rhxs)\n", pszLogName, sizeof(pEhdr->e_ident), pEhdr->e_ident)); NOREF(pszLogName);
1467	return VERR_BAD_EXE_FORMAT;
1468	}
1469	if (pEhdr->e_ident[EI_CLASS] != RTLDRELF_SUFF(ELFCLASS))
1470	{
1471	Log(("RTLdrELF: %s: Invalid ELF class (%.*Rhxs)\n", pszLogName, sizeof(pEhdr->e_ident), pEhdr->e_ident));
1472	return VERR_BAD_EXE_FORMAT;
1473	}
1474	if (pEhdr->e_ident[EI_DATA] != ELFDATA2LSB)
1475	{
1476	Log(("RTLdrELF: %s: ELF endian %x is unsupported\n", pEhdr->e_ident[EI_DATA]));
1477	return VERR_LDRELF_ODD_ENDIAN;
1478	}
1479	if (pEhdr->e_version != EV_CURRENT)
1480	{
1481	Log(("RTLdrELF: %s: ELF version %x is unsupported\n", pEhdr->e_version));
1482	return VERR_LDRELF_VERSION;
1483	}
1484
1485	if (sizeof(Elf_Ehdr) != pEhdr->e_ehsize)
1486	{
1487	Log(("RTLdrELF: %s: Elf header e_ehsize is %d expected %d!\n",
1488	pszLogName, pEhdr->e_ehsize, sizeof(Elf_Ehdr)));
1489	return VERR_BAD_EXE_FORMAT;
1490	}
1491	if ( sizeof(Elf_Phdr) != pEhdr->e_phentsize
1492	&& ( pEhdr->e_phnum != 0
1493	\|\| pEhdr->e_type == ET_DYN))
1494	{
1495	Log(("RTLdrELF: %s: Elf header e_phentsize is %d expected %d!\n",
1496	pszLogName, pEhdr->e_phentsize, sizeof(Elf_Phdr)));
1497	return VERR_BAD_EXE_FORMAT;
1498	}
1499	if (sizeof(Elf_Shdr) != pEhdr->e_shentsize)
1500	{
1501	Log(("RTLdrELF: %s: Elf header e_shentsize is %d expected %d!\n",
1502	pszLogName, pEhdr->e_shentsize, sizeof(Elf_Shdr)));
1503	return VERR_BAD_EXE_FORMAT;
1504	}
1505
1506	switch (pEhdr->e_type)
1507	{
1508	case ET_REL:
1509	case ET_EXEC:
1510	case ET_DYN:
1511	break;
1512	default:
1513	Log(("RTLdrELF: %s: image type %#x is not supported!\n", pszLogName, pEhdr->e_type));
1514	return VERR_BAD_EXE_FORMAT;
1515	}
1516
1517	switch (pEhdr->e_machine)
1518	{
1519	#if ELF_MODE == 32
1520	case EM_386:
1521	case EM_486:
1522	*penmArch = RTLDRARCH_X86_32;
1523	break;
1524	#elif ELF_MODE == 64
1525	case EM_X86_64:
1526	*penmArch = RTLDRARCH_AMD64;
1527	break;
1528	#endif
1529	default:
1530	Log(("RTLdrELF: %s: machine type %u is not supported!\n", pEhdr->e_machine));
1531	return VERR_LDRELF_MACHINE;
1532	}
1533
1534	if ( pEhdr->e_phoff < pEhdr->e_ehsize
1535	&& !(pEhdr->e_phoff && pEhdr->e_phnum)
1536	&& pEhdr->e_phnum)
1537	{
1538	Log(("RTLdrELF: %s: The program headers overlap with the ELF header! e_phoff=" FMT_ELF_OFF "\n",
1539	pszLogName, pEhdr->e_phoff));
1540	return VERR_BAD_EXE_FORMAT;
1541	}
1542	if ( pEhdr->e_phoff + pEhdr->e_phnum * pEhdr->e_phentsize > cbRawImage
1543	\|\| pEhdr->e_phoff + pEhdr->e_phnum * pEhdr->e_phentsize < pEhdr->e_phoff)
1544	{
1545	Log(("RTLdrELF: %s: The program headers extends beyond the file! e_phoff=" FMT_ELF_OFF " e_phnum=" FMT_ELF_HALF "\n",
1546	pszLogName, pEhdr->e_phoff, pEhdr->e_phnum));
1547	return VERR_BAD_EXE_FORMAT;
1548	}
1549
1550
1551	if ( pEhdr->e_shoff < pEhdr->e_ehsize
1552	&& !(pEhdr->e_shoff && pEhdr->e_shnum))
1553	{
1554	Log(("RTLdrELF: %s: The section headers overlap with the ELF header! e_shoff=" FMT_ELF_OFF "\n",
1555	pszLogName, pEhdr->e_shoff));
1556	return VERR_BAD_EXE_FORMAT;
1557	}
1558	if ( pEhdr->e_shoff + pEhdr->e_shnum * pEhdr->e_shentsize > cbRawImage
1559	\|\| pEhdr->e_shoff + pEhdr->e_shnum * pEhdr->e_shentsize < pEhdr->e_shoff)
1560	{
1561	Log(("RTLdrELF: %s: The section headers extends beyond the file! e_shoff=" FMT_ELF_OFF " e_shnum=" FMT_ELF_HALF "\n",
1562	pszLogName, pEhdr->e_shoff, pEhdr->e_shnum));
1563	return VERR_BAD_EXE_FORMAT;
1564	}
1565
1566	if (pEhdr->e_shstrndx == 0 \|\| pEhdr->e_shstrndx > pEhdr->e_shnum)
1567	{
1568	Log(("RTLdrELF: %s: The section headers string table is out of bounds! e_shstrndx=" FMT_ELF_HALF " e_shnum=" FMT_ELF_HALF "\n",
1569	pszLogName, pEhdr->e_shstrndx, pEhdr->e_shnum));
1570	return VERR_BAD_EXE_FORMAT;
1571	}
1572
1573	return VINF_SUCCESS;
1574	}
1575
1576	/**
1577	* Gets the section header name.
1578	*
1579	* @returns pszName.
1580	* @param pEhdr The elf header.
1581	* @param offName The offset of the section header name.
1582	* @param pszName Where to store the name.
1583	* @param cbName The size of the buffer pointed to by pszName.
1584	*/
1585	const char RTLDRELF_NAME(GetSHdrName)(PRTLDRMODELF pModElf, Elf_Word offName, char pszName, size_t cbName)
1586	{
1587	RTFOFF off = pModElf->paShdrs[pModElf->Ehdr.e_shstrndx].sh_offset + offName;
1588	int rc = pModElf->Core.pReader->pfnRead(pModElf->Core.pReader, pszName, cbName - 1, off);
1589	if (RT_FAILURE(rc))
1590	{
1591	/* read by for byte. */
1592	for (unsigned i = 0; i < cbName; i++, off++)
1593	{
1594	rc = pModElf->Core.pReader->pfnRead(pModElf->Core.pReader, pszName + i, 1, off);
1595	if (RT_FAILURE(rc))
1596	{
1597	pszName[i] = '\0';
1598	break;
1599	}
1600	}
1601	}
1602
1603	pszName[cbName - 1] = '\0';
1604	return pszName;
1605	}
1606
1607
1608	/**
1609	* Validates a section header.
1610	*
1611	* @returns iprt status code.
1612	* @param pModElf Pointer to the module structure.
1613	* @param iShdr The index of section header which should be validated.
1614	* The section headers are found in the pModElf->paShdrs array.
1615	* @param pszLogName The log name.
1616	* @param cbRawImage The size of the raw image.
1617	*/
1618	static int RTLDRELF_NAME(ValidateSectionHeader)(PRTLDRMODELF pModElf, unsigned iShdr, const char *pszLogName, RTFOFF cbRawImage)
1619	{
1620	const Elf_Shdr *pShdr = &pModElf->paShdrs[iShdr];
1621	char szSectionName[80]; NOREF(szSectionName);
1622	Log3(("RTLdrELF: Section Header #%d:\n"
1623	"RTLdrELF: sh_name: " FMT_ELF_WORD " - %s\n"
1624	"RTLdrELF: sh_type: " FMT_ELF_WORD " (%s)\n"
1625	"RTLdrELF: sh_flags: " FMT_ELF_XWORD "\n"
1626	"RTLdrELF: sh_addr: " FMT_ELF_ADDR "\n"
1627	"RTLdrELF: sh_offset: " FMT_ELF_OFF "\n"
1628	"RTLdrELF: sh_size: " FMT_ELF_XWORD "\n"
1629	"RTLdrELF: sh_link: " FMT_ELF_WORD "\n"
1630	"RTLdrELF: sh_info: " FMT_ELF_WORD "\n"
1631	"RTLdrELF: sh_addralign: " FMT_ELF_XWORD "\n"
1632	"RTLdrELF: sh_entsize: " FMT_ELF_XWORD "\n",
1633	iShdr,
1634	pShdr->sh_name, RTLDRELF_NAME(GetSHdrName)(pModElf, pShdr->sh_name, szSectionName, sizeof(szSectionName)),
1635	pShdr->sh_type, rtldrElfGetShdrType(pShdr->sh_type), pShdr->sh_flags, pShdr->sh_addr,
1636	pShdr->sh_offset, pShdr->sh_size, pShdr->sh_link, pShdr->sh_info, pShdr->sh_addralign,
1637	pShdr->sh_entsize));
1638
1639	if (iShdr == 0)
1640	{
1641	if ( pShdr->sh_name != 0
1642	\|\| pShdr->sh_type != SHT_NULL
1643	\|\| pShdr->sh_flags != 0
1644	\|\| pShdr->sh_addr != 0
1645	\|\| pShdr->sh_size != 0
1646	\|\| pShdr->sh_offset != 0
1647	\|\| pShdr->sh_link != SHN_UNDEF
1648	\|\| pShdr->sh_addralign != 0
1649	\|\| pShdr->sh_entsize != 0 )
1650	{
1651	Log(("RTLdrELF: %s: Bad #0 section: %.Rhxs\n", pszLogName, sizeof(pShdr), pShdr ));
1652	return VERR_BAD_EXE_FORMAT;
1653	}
1654	return VINF_SUCCESS;
1655	}
1656
1657	if (pShdr->sh_name >= pModElf->cbShStr)
1658	{
1659	Log(("RTLdrELF: %s: Shdr #%d: sh_name (%d) is beyond the end of the section header string table (%d)!\n",
1660	pszLogName, iShdr, pShdr->sh_name, pModElf->cbShStr)); NOREF(pszLogName);
1661	return VERR_BAD_EXE_FORMAT;
1662	}
1663
1664	if (pShdr->sh_link >= pModElf->Ehdr.e_shnum)
1665	{
1666	Log(("RTLdrELF: %s: Shdr #%d: sh_link (%d) is beyond the end of the section table (%d)!\n",
1667	pszLogName, iShdr, pShdr->sh_link, pModElf->Ehdr.e_shnum)); NOREF(pszLogName);
1668	return VERR_BAD_EXE_FORMAT;
1669	}
1670
1671	switch (pShdr->sh_type)
1672	{
1673	/** @todo find specs and check up which sh_info fields indicates section table entries */
1674	case 12301230:
1675	if (pShdr->sh_info >= pModElf->Ehdr.e_shnum)
1676	{
1677	Log(("RTLdrELF: %s: Shdr #%d: sh_info (%d) is beyond the end of the section table (%d)!\n",
1678	pszLogName, iShdr, pShdr->sh_link, pModElf->Ehdr.e_shnum));
1679	return VERR_BAD_EXE_FORMAT;
1680	}
1681	break;
1682
1683	case SHT_NULL:
1684	break;
1685	case SHT_PROGBITS:
1686	case SHT_SYMTAB:
1687	case SHT_STRTAB:
1688	case SHT_RELA:
1689	case SHT_HASH:
1690	case SHT_DYNAMIC:
1691	case SHT_NOTE:
1692	case SHT_NOBITS:
1693	case SHT_REL:
1694	case SHT_SHLIB:
1695	case SHT_DYNSYM:
1696	/*
1697	* For these types sh_info doesn't have any special meaning, or anything which
1698	* we need/can validate now.
1699	*/
1700	break;
1701
1702
1703	default:
1704	Log(("RTLdrELF: %s: Warning, unknown type %d!\n", pszLogName, pShdr->sh_type));
1705	break;
1706	}
1707
1708	if ( pShdr->sh_type != SHT_NOBITS
1709	&& pShdr->sh_size)
1710	{
1711	RTFOFF offEnd = pShdr->sh_offset + pShdr->sh_size;
1712	if ( offEnd > cbRawImage
1713	\|\| offEnd < (RTFOFF)pShdr->sh_offset)
1714	{
1715	Log(("RTLdrELF: %s: Shdr #%d: sh_offset (" FMT_ELF_OFF ") + sh_size (" FMT_ELF_XWORD " = %RTfoff) is beyond the end of the file (%RTfoff)!\n",
1716	pszLogName, iShdr, pShdr->sh_offset, pShdr->sh_size, offEnd, cbRawImage));
1717	return VERR_BAD_EXE_FORMAT;
1718	}
1719	if (pShdr->sh_offset < sizeof(Elf_Ehdr))
1720	{
1721	Log(("RTLdrELF: %s: Shdr #%d: sh_offset (" FMT_ELF_OFF ") + sh_size (" FMT_ELF_XWORD ") is starting in the ELF header!\n",
1722	pszLogName, iShdr, pShdr->sh_offset, pShdr->sh_size, cbRawImage));
1723	return VERR_BAD_EXE_FORMAT;
1724	}
1725	}
1726
1727	return VINF_SUCCESS;
1728	}
1729
1730
1731
1732	/**
1733	* Opens an ELF image, fixed bitness.
1734	*
1735	* @returns iprt status code.
1736	* @param pReader The loader reader instance which will provide the raw image bits.
1737	* @param fFlags Reserved, MBZ.
1738	* @param enmArch Architecture specifier.
1739	* @param phLdrMod Where to store the handle.
1740	*/
1741	static int RTLDRELF_NAME(Open)(PRTLDRREADER pReader, uint32_t fFlags, RTLDRARCH enmArch, PRTLDRMOD phLdrMod)
1742	{
1743	const char *pszLogName = pReader->pfnLogName(pReader);
1744	RTFOFF cbRawImage = pReader->pfnSize(pReader);
1745
1746	/*
1747	* Create the loader module instance.
1748	*/
1749	PRTLDRMODELF pModElf = (PRTLDRMODELF)RTMemAllocZ(sizeof(*pModElf));
1750	if (!pModElf)
1751	return VERR_NO_MEMORY;
1752
1753	pModElf->Core.u32Magic = RTLDRMOD_MAGIC;
1754	pModElf->Core.eState = LDR_STATE_INVALID;
1755	pModElf->Core.pReader = pReader;
1756	pModElf->Core.enmFormat = RTLDRFMT_ELF;
1757	pModElf->Core.enmType = RTLDRTYPE_OBJECT;
1758	pModElf->Core.enmEndian = RTLDRENDIAN_LITTLE;
1759	#if ELF_MODE == 32
1760	pModElf->Core.enmArch = RTLDRARCH_X86_32;
1761	#else
1762	pModElf->Core.enmArch = RTLDRARCH_AMD64;
1763	#endif
1764	//pModElf->pvBits = NULL;
1765	//pModElf->Ehdr = {0};
1766	//pModElf->paShdrs = NULL;
1767	//pModElf->paSyms = NULL;
1768	pModElf->iSymSh = ~0U;
1769	//pModElf->cSyms = 0;
1770	pModElf->iStrSh = ~0U;
1771	//pModElf->cbStr = 0;
1772	//pModElf->cbImage = 0;
1773	//pModElf->LinkAddress = 0;
1774	//pModElf->pStr = NULL;
1775	//pModElf->cbShStr = 0;
1776	//pModElf->pShStr = NULL;
1777
1778	/*
1779	* Read and validate the ELF header and match up the CPU architecture.
1780	*/
1781	int rc = pReader->pfnRead(pReader, &pModElf->Ehdr, sizeof(pModElf->Ehdr), 0);
1782	if (RT_SUCCESS(rc))
1783	{
1784	RTLDRARCH enmArchImage = RTLDRARCH_INVALID; /* shut up gcc */
1785	rc = RTLDRELF_NAME(ValidateElfHeader)(&pModElf->Ehdr, pszLogName, cbRawImage, &enmArchImage);
1786	if (RT_SUCCESS(rc))
1787	{
1788	if ( enmArch != RTLDRARCH_WHATEVER
1789	&& enmArch != enmArchImage)
1790	rc = VERR_LDR_ARCH_MISMATCH;
1791	}
1792	}
1793	if (RT_SUCCESS(rc))
1794	{
1795	/*
1796	* Read the section headers, keeping a prestine copy for the module
1797	* introspection methods.
1798	*/
1799	size_t const cbShdrs = pModElf->Ehdr.e_shnum * sizeof(Elf_Shdr);
1800	Elf_Shdr paShdrs = (Elf_Shdr )RTMemAlloc(cbShdrs * 2);
1801	if (paShdrs)
1802	{
1803	pModElf->paShdrs = paShdrs;
1804	rc = pReader->pfnRead(pReader, paShdrs, cbShdrs, pModElf->Ehdr.e_shoff);
1805	if (RT_SUCCESS(rc))
1806	{
1807	memcpy(&paShdrs[pModElf->Ehdr.e_shnum], paShdrs, cbShdrs);
1808	pModElf->paOrgShdrs = &paShdrs[pModElf->Ehdr.e_shnum];
1809
1810	pModElf->cbShStr = paShdrs[pModElf->Ehdr.e_shstrndx].sh_size;
1811
1812	/*
1813	* Validate the section headers and find relevant sections.
1814	*/
1815	Elf_Addr uNextAddr = 0;
1816	for (unsigned i = 0; i < pModElf->Ehdr.e_shnum; i++)
1817	{
1818	rc = RTLDRELF_NAME(ValidateSectionHeader)(pModElf, i, pszLogName, cbRawImage);
1819	if (RT_FAILURE(rc))
1820	break;
1821
1822	/* We're looking for symbol tables. */
1823	if (paShdrs[i].sh_type == SHT_SYMTAB)
1824	{
1825	if (pModElf->iSymSh != ~0U)
1826	{
1827	Log(("RTLdrElf: %s: Multiple symbol tabs! iSymSh=%d i=%d\n", pszLogName, pModElf->iSymSh, i));
1828	rc = VERR_LDRELF_MULTIPLE_SYMTABS;
1829	break;
1830	}
1831	pModElf->iSymSh = i;
1832	pModElf->cSyms = (unsigned)(paShdrs[i].sh_size / sizeof(Elf_Sym));
1833	AssertReturn(pModElf->cSyms == paShdrs[i].sh_size / sizeof(Elf_Sym), VERR_IMAGE_TOO_BIG);
1834	pModElf->iStrSh = paShdrs[i].sh_link;
1835	pModElf->cbStr = (unsigned)paShdrs[pModElf->iStrSh].sh_size;
1836	AssertReturn(pModElf->cbStr == paShdrs[pModElf->iStrSh].sh_size, VERR_IMAGE_TOO_BIG);
1837	}
1838
1839	/* Special checks for the section string table. */
1840	if (i == pModElf->Ehdr.e_shstrndx)
1841	{
1842	if (paShdrs[i].sh_type != SHT_STRTAB)
1843	{
1844	Log(("RTLdrElf: Section header string table is not a SHT_STRTAB: %#x\n", paShdrs[i].sh_type));
1845	rc = VERR_BAD_EXE_FORMAT;
1846	break;
1847	}
1848	if (paShdrs[i].sh_size == 0)
1849	{
1850	Log(("RTLdrElf: Section header string table is empty\n"));
1851	rc = VERR_BAD_EXE_FORMAT;
1852	break;
1853	}
1854	}
1855
1856	/* Kluge for the .data..percpu segment in 64-bit linux kernels. */
1857	if (paShdrs[i].sh_flags & SHF_ALLOC)
1858	{
1859	if ( paShdrs[i].sh_addr == 0
1860	&& paShdrs[i].sh_addr < uNextAddr)
1861	{
1862	Elf_Addr uAddr = RT_ALIGN_T(uNextAddr, paShdrs[i].sh_addralign, Elf_Addr);
1863	Log(("RTLdrElf: Out of order section #%d; adjusting sh_addr from " FMT_ELF_ADDR " to " FMT_ELF_ADDR "\n",
1864	paShdrs[i].sh_addr, uAddr));
1865	paShdrs[i].sh_addr = uAddr;
1866	}
1867	uNextAddr = paShdrs[i].sh_addr + paShdrs[i].sh_size;
1868	}
1869	} /* for each section header */
1870
1871	/*
1872	* Calculate the image base address if the image isn't relocatable.
1873	*/
1874	if (RT_SUCCESS(rc) && pModElf->Ehdr.e_type != ET_REL)
1875	{
1876	pModElf->LinkAddress = ~(Elf_Addr)0;
1877	for (unsigned i = 0; i < pModElf->Ehdr.e_shnum; i++)
1878	if ( (paShdrs[i].sh_flags & SHF_ALLOC)
1879	&& paShdrs[i].sh_addr < pModElf->LinkAddress)
1880	pModElf->LinkAddress = paShdrs[i].sh_addr;
1881	if (pModElf->LinkAddress == ~(Elf_Addr)0)
1882	{
1883	AssertFailed();
1884	rc = VERR_LDR_GENERAL_FAILURE;
1885	}
1886	}
1887
1888	/*
1889	* Perform allocations / RVA calculations, determine the image size.
1890	*/
1891	if (RT_SUCCESS(rc))
1892	for (unsigned i = 0; i < pModElf->Ehdr.e_shnum; i++)
1893	if (paShdrs[i].sh_flags & SHF_ALLOC)
1894	{
1895	if (pModElf->Ehdr.e_type == ET_REL)
1896	paShdrs[i].sh_addr = paShdrs[i].sh_addralign
1897	? RT_ALIGN_T(pModElf->cbImage, paShdrs[i].sh_addralign, Elf_Addr)
1898	: (Elf_Addr)pModElf->cbImage;
1899	else
1900	paShdrs[i].sh_addr -= pModElf->LinkAddress;
1901	Elf_Addr EndAddr = paShdrs[i].sh_addr + paShdrs[i].sh_size;
1902	if (pModElf->cbImage < EndAddr)
1903	{
1904	pModElf->cbImage = (size_t)EndAddr;
1905	AssertMsgReturn(pModElf->cbImage == EndAddr, (FMT_ELF_ADDR "\n", EndAddr), VERR_IMAGE_TOO_BIG);
1906	}
1907	Log2(("RTLdrElf: %s: Assigned " FMT_ELF_ADDR " to section #%d\n", pszLogName, paShdrs[i].sh_addr, i));
1908	}
1909
1910	Log2(("RTLdrElf: iSymSh=%u cSyms=%u iStrSh=%u cbStr=%u rc=%Rrc cbImage=%#zx LinkAddress=" FMT_ELF_ADDR "\n",
1911	pModElf->iSymSh, pModElf->cSyms, pModElf->iStrSh, pModElf->cbStr, rc,
1912	pModElf->cbImage, pModElf->LinkAddress));
1913	if (RT_SUCCESS(rc))
1914	{
1915	pModElf->Core.pOps = &RTLDRELF_MID(s_rtldrElf,Ops);
1916	pModElf->Core.eState = LDR_STATE_OPENED;
1917	*phLdrMod = &pModElf->Core;
1918
1919	LogFlow(("%s: %s: returns VINF_SUCCESS phLdrMod=%p\n", __FUNCTION__, pszLogName, phLdrMod));
1920	return VINF_SUCCESS;
1921	}
1922	}
1923
1924	RTMemFree(paShdrs);
1925	}
1926	else
1927	rc = VERR_NO_MEMORY;
1928	}
1929
1930	RTMemFree(pModElf);
1931	LogFlow(("%s: returns %Rrc\n", __FUNCTION__, rc));
1932	return rc;
1933	}
1934
1935
1936
1937
1938	/*******************************************************************************
1939	* Cleanup Constants And Macros *
1940	*******************************************************************************/
1941	#undef RTLDRELF_NAME
1942	#undef RTLDRELF_SUFF
1943	#undef RTLDRELF_MID
1944
1945	#undef FMT_ELF_ADDR
1946	#undef FMT_ELF_HALF
1947	#undef FMT_ELF_SHALF
1948	#undef FMT_ELF_OFF
1949	#undef FMT_ELF_SIZE
1950	#undef FMT_ELF_SWORD
1951	#undef FMT_ELF_WORD
1952	#undef FMT_ELF_XWORD
1953	#undef FMT_ELF_SXWORD
1954
1955	#undef Elf_Ehdr
1956	#undef Elf_Phdr
1957	#undef Elf_Shdr
1958	#undef Elf_Sym
1959	#undef Elf_Rel
1960	#undef Elf_Rela
1961	#undef Elf_Reloc
1962	#undef Elf_Nhdr
1963	#undef Elf_Dyn
1964
1965	#undef Elf_Addr
1966	#undef Elf_Half
1967	#undef Elf_Off
1968	#undef Elf_Size
1969	#undef Elf_Sword
1970	#undef Elf_Word
1971
1972	#undef RTLDRMODELF
1973	#undef PRTLDRMODELF
1974
1975	#undef ELF_R_SYM
1976	#undef ELF_R_TYPE
1977	#undef ELF_R_INFO
1978
1979	#undef ELF_ST_BIND
1980

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source: vbox/trunk/src/VBox/Runtime/common/ldr/ldrELFRelocatable.cpp.h@ 52213

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