ldrELFRelocatable.cpp.h@ 46474

Last change on this file since 46474 was 46266, checked in by vboxsync, 12 years ago
IPRT: Changed RTLDRSEG::pchName to pszName and make sure it's always set to something. Started on implementing a codeview reader.
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1	/* $Id: ldrELFRelocatable.cpp.h 46266 2013-05-25 19:51:19Z 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	/** @copydoc RTLDROPS::pfnGetSymbolEx */
925	static DECLCALLBACK(int) RTLDRELF_NAME(GetSymbolEx)(PRTLDRMODINTERNAL pMod, const void pvBits, RTUINTPTR BaseAddress, const char pszSymbol, RTUINTPTR *pValue)
926	{
927	PRTLDRMODELF pModElf = (PRTLDRMODELF)pMod;
928	NOREF(pvBits);
929
930	/*
931	* Validate the input.
932	*/
933	Elf_Addr BaseAddr = (Elf_Addr)BaseAddress;
934	AssertMsgReturn((RTUINTPTR)BaseAddr == BaseAddress, ("#RTptr", BaseAddress), VERR_IMAGE_BASE_TOO_HIGH);
935
936	/*
937	* Map the image bits if not already done and setup pointer into it.
938	*/
939	int rc = RTLDRELF_NAME(MapBits)(pModElf, true);
940	if (RT_FAILURE(rc))
941	return rc;
942
943	/*
944	* Calc all kinds of pointers before we start iterating the symbol table.
945	*/
946	const char *pStr = pModElf->pStr;
947	const Elf_Sym *paSyms = pModElf->paSyms;
948	unsigned cSyms = pModElf->cSyms;
949	for (unsigned iSym = 1; iSym < cSyms; iSym++)
950	{
951	/* Undefined symbols are not exports, they are imports. */
952	if ( paSyms[iSym].st_shndx != SHN_UNDEF
953	&& ( ELF_ST_BIND(paSyms[iSym].st_info) == STB_GLOBAL
954	\|\| ELF_ST_BIND(paSyms[iSym].st_info) == STB_WEAK))
955	{
956	/* Validate the name string and try match with it. */
957	if (paSyms[iSym].st_name < pModElf->cbStr)
958	{
959	if (!strcmp(pszSymbol, pStr + paSyms[iSym].st_name))
960	{
961	/* matched! */
962	Elf_Addr Value;
963	if (paSyms[iSym].st_shndx == SHN_ABS)
964	/* absolute symbols are not subject to any relocation. */
965	Value = paSyms[iSym].st_value;
966	else if (paSyms[iSym].st_shndx < pModElf->Ehdr.e_shnum)
967	{
968	if (pModElf->Ehdr.e_type == ET_REL)
969	/* relative to the section. */
970	Value = BaseAddr + paSyms[iSym].st_value + pModElf->paShdrs[paSyms[iSym].st_shndx].sh_addr;
971	else /* Fixed up for link address. */
972	Value = BaseAddr + paSyms[iSym].st_value - pModElf->LinkAddress;
973	}
974	else
975	{
976	AssertMsgFailed(("Arg. paSyms[iSym].st_shndx=%d\n", paSyms[iSym].st_shndx));
977	return VERR_BAD_EXE_FORMAT;
978	}
979	AssertMsgReturn(Value == (RTUINTPTR)Value, (FMT_ELF_ADDR "\n", Value), VERR_SYMBOL_VALUE_TOO_BIG);
980	*pValue = (RTUINTPTR)Value;
981	return VINF_SUCCESS;
982	}
983	}
984	else
985	{
986	AssertMsgFailed(("String outside string table! iSym=%d paSyms[iSym].st_name=%#x\n", iSym, paSyms[iSym].st_name));
987	return VERR_LDRELF_INVALID_SYMBOL_NAME_OFFSET;
988	}
989	}
990	}
991
992	return VERR_SYMBOL_NOT_FOUND;
993	}
994
995
996	/** @copydoc RTLDROPS::pfnEnumDbgInfo */
997	static DECLCALLBACK(int) RTLDRELF_NAME(EnumDbgInfo)(PRTLDRMODINTERNAL pMod, const void *pvBits,
998	PFNRTLDRENUMDBG pfnCallback, void *pvUser)
999	{
1000	PRTLDRMODELF pModElf = (PRTLDRMODELF)pMod;
1001
1002	/*
1003	* Map the image bits if not already done and setup pointer into it.
1004	*/
1005	int rc = RTLDRELF_NAME(MapBits)(pModElf, true);
1006	if (RT_FAILURE(rc))
1007	return rc;
1008
1009	/*
1010	* Do the enumeration.
1011	*/
1012	const Elf_Shdr *paShdrs = pModElf->paOrgShdrs;
1013	for (unsigned iShdr = 0; iShdr < pModElf->Ehdr.e_shnum; iShdr++)
1014	{
1015	/* Debug sections are expected to be PROGBITS and not allocated. */
1016	if (paShdrs[iShdr].sh_type != SHT_PROGBITS)
1017	continue;
1018	if (paShdrs[iShdr].sh_flags & SHF_ALLOC)
1019	continue;
1020
1021	RTLDRDBGINFO DbgInfo;
1022	const char *pszSectName = ELF_SH_STR(pModElf, paShdrs[iShdr].sh_name);
1023	if ( !strncmp(pszSectName, RT_STR_TUPLE(".debug_"))
1024	\|\| !strcmp(pszSectName, ".WATCOM_references") )
1025	{
1026	RT_ZERO(DbgInfo.u);
1027	DbgInfo.enmType = RTLDRDBGINFOTYPE_DWARF;
1028	DbgInfo.pszExtFile = NULL;
1029	DbgInfo.offFile = paShdrs[iShdr].sh_offset;
1030	DbgInfo.cb = paShdrs[iShdr].sh_size;
1031	DbgInfo.u.Dwarf.pszSection = pszSectName;
1032	}
1033	else if (!strcmp(pszSectName, ".gnu_debuglink"))
1034	{
1035	if ((paShdrs[iShdr].sh_size & 3) \|\| paShdrs[iShdr].sh_size < 8)
1036	return VERR_BAD_EXE_FORMAT;
1037
1038	RT_ZERO(DbgInfo.u);
1039	DbgInfo.enmType = RTLDRDBGINFOTYPE_DWARF_DWO;
1040	DbgInfo.pszExtFile = (const char *)((uintptr_t)pModElf->pvBits + (uintptr_t)paShdrs[iShdr].sh_offset);
1041	if (!RTStrEnd(DbgInfo.pszExtFile, paShdrs[iShdr].sh_size))
1042	return VERR_BAD_EXE_FORMAT;
1043	DbgInfo.u.Dwo.uCrc32 = (uint32_t )((uintptr_t)DbgInfo.pszExtFile + (uintptr_t)paShdrs[iShdr].sh_size
1044	- sizeof(uint32_t));
1045	DbgInfo.offFile = -1;
1046	DbgInfo.cb = 0;
1047	}
1048	else
1049	continue;
1050
1051	DbgInfo.LinkAddress = NIL_RTLDRADDR;
1052	DbgInfo.iDbgInfo = iShdr - 1;
1053
1054	rc = pfnCallback(pMod, &DbgInfo, pvUser);
1055	if (rc != VINF_SUCCESS)
1056	return rc;
1057
1058	}
1059
1060	return VINF_SUCCESS;
1061	}
1062
1063
1064	/**
1065	* Helper that locates the first allocated section.
1066	*
1067	* @returns Pointer to the section header if found, NULL if none.
1068	* @param pShdr The section header to start searching at.
1069	* @param cLeft The number of section headers left to search. Can be 0.
1070	*/
1071	static const Elf_Shdr RTLDRELF_NAME(GetFirstAllocatedSection)(const Elf_Shdr pShdr, unsigned cLeft)
1072	{
1073	while (cLeft-- > 0)
1074	{
1075	if (pShdr->sh_flags & SHF_ALLOC)
1076	return pShdr;
1077	pShdr++;
1078	}
1079	return NULL;
1080	}
1081
1082	/** @copydoc RTLDROPS::pfnEnumSegments. */
1083	static DECLCALLBACK(int) RTLDRELF_NAME(EnumSegments)(PRTLDRMODINTERNAL pMod, PFNRTLDRENUMSEGS pfnCallback, void *pvUser)
1084	{
1085	PRTLDRMODELF pModElf = (PRTLDRMODELF)pMod;
1086
1087	/*
1088	* Map the image bits if not already done and setup pointer into it.
1089	*/
1090	int rc = RTLDRELF_NAME(MapBits)(pModElf, true);
1091	if (RT_FAILURE(rc))
1092	return rc;
1093
1094	/*
1095	* Do the enumeration.
1096	*/
1097	char szName[32];
1098	const Elf_Shdr *paShdrs = pModElf->paShdrs;
1099	const Elf_Shdr *paOrgShdrs = pModElf->paOrgShdrs;
1100	for (unsigned iShdr = 1; iShdr < pModElf->Ehdr.e_shnum; iShdr++)
1101	{
1102	RTLDRSEG Seg;
1103	Seg.pszName = ELF_SH_STR(pModElf, paShdrs[iShdr].sh_name);
1104	Seg.cchName = (uint32_t)strlen(Seg.pszName);
1105	if (Seg.cchName == 0)
1106	{
1107	Seg.pszName = szName;
1108	Seg.cchName = (uint32_t)RTStrPrintf(szName, sizeof(szName), "UnamedSect%02u", iShdr);
1109	}
1110	Seg.SelFlat = 0;
1111	Seg.Sel16bit = 0;
1112	Seg.fFlags = 0;
1113	Seg.fProt = RTMEM_PROT_READ;
1114	if (paShdrs[iShdr].sh_flags & SHF_WRITE)
1115	Seg.fProt \|= RTMEM_PROT_WRITE;
1116	if (paShdrs[iShdr].sh_flags & SHF_EXECINSTR)
1117	Seg.fProt \|= RTMEM_PROT_EXEC;
1118	Seg.cb = paShdrs[iShdr].sh_size;
1119	Seg.Alignment = paShdrs[iShdr].sh_addralign;
1120	if (paShdrs[iShdr].sh_flags & SHF_ALLOC)
1121	{
1122	Seg.LinkAddress = paOrgShdrs[iShdr].sh_addr;
1123	Seg.RVA = paShdrs[iShdr].sh_addr;
1124	const Elf_Shdr *pShdr2 = RTLDRELF_NAME(GetFirstAllocatedSection)(&paShdrs[iShdr + 1],
1125	pModElf->Ehdr.e_shnum - iShdr - 1);
1126	Seg.cbMapped = pShdr2 ? pShdr2->sh_addr - paShdrs[iShdr].sh_addr : paShdrs[iShdr].sh_size;
1127	}
1128	else
1129	{
1130	Seg.LinkAddress = NIL_RTLDRADDR;
1131	Seg.RVA = NIL_RTLDRADDR;
1132	Seg.cbMapped = NIL_RTLDRADDR;
1133	}
1134	if (paShdrs[iShdr].sh_type != SHT_NOBITS)
1135	{
1136	Seg.offFile = paShdrs[iShdr].sh_offset;
1137	Seg.cbFile = paShdrs[iShdr].sh_size;
1138	}
1139	else
1140	{
1141	Seg.offFile = -1;
1142	Seg.cbFile = 0;
1143	}
1144
1145	rc = pfnCallback(pMod, &Seg, pvUser);
1146	if (rc != VINF_SUCCESS)
1147	return rc;
1148	}
1149
1150	return VINF_SUCCESS;
1151	}
1152
1153
1154	/** @copydoc RTLDROPS::pfnLinkAddressToSegOffset. */
1155	static DECLCALLBACK(int) RTLDRELF_NAME(LinkAddressToSegOffset)(PRTLDRMODINTERNAL pMod, RTLDRADDR LinkAddress,
1156	uint32_t *piSeg, PRTLDRADDR poffSeg)
1157	{
1158	PRTLDRMODELF pModElf = (PRTLDRMODELF)pMod;
1159
1160	const Elf_Shdr *pShdrEnd = NULL;
1161	unsigned cLeft = pModElf->Ehdr.e_shnum - 1;
1162	const Elf_Shdr *pShdr = &pModElf->paOrgShdrs[cLeft];
1163	while (cLeft-- > 0)
1164	{
1165	if (pShdr->sh_flags & SHF_ALLOC)
1166	{
1167	RTLDRADDR offSeg = LinkAddress - pShdr->sh_addr;
1168	if (offSeg < pShdr->sh_size)
1169	{
1170	*poffSeg = offSeg;
1171	*piSeg = cLeft;
1172	return VINF_SUCCESS;
1173	}
1174	if (offSeg == pShdr->sh_size)
1175	pShdrEnd = pShdr;
1176	}
1177	pShdr--;
1178	}
1179
1180	if (pShdrEnd)
1181	{
1182	*poffSeg = pShdrEnd->sh_size;
1183	*piSeg = pShdrEnd - pModElf->paOrgShdrs - 1;
1184	return VINF_SUCCESS;
1185	}
1186
1187	return VERR_LDR_INVALID_LINK_ADDRESS;
1188	}
1189
1190
1191	/** @copydoc RTLDROPS::pfnLinkAddressToRva. */
1192	static DECLCALLBACK(int) RTLDRELF_NAME(LinkAddressToRva)(PRTLDRMODINTERNAL pMod, RTLDRADDR LinkAddress, PRTLDRADDR pRva)
1193	{
1194	PRTLDRMODELF pModElf = (PRTLDRMODELF)pMod;
1195	uint32_t iSeg;
1196	RTLDRADDR offSeg;
1197	int rc = RTLDRELF_NAME(LinkAddressToSegOffset)(pMod, LinkAddress, &iSeg, &offSeg);
1198	if (RT_SUCCESS(rc))
1199	*pRva = pModElf->paShdrs[iSeg + 1].sh_addr + offSeg;
1200	return rc;
1201	}
1202
1203
1204	/** @copydoc RTLDROPS::pfnSegOffsetToRva. */
1205	static DECLCALLBACK(int) RTLDRELF_NAME(SegOffsetToRva)(PRTLDRMODINTERNAL pMod, uint32_t iSeg, RTLDRADDR offSeg,
1206	PRTLDRADDR pRva)
1207	{
1208	PRTLDRMODELF pModElf = (PRTLDRMODELF)pMod;
1209	if (iSeg >= pModElf->Ehdr.e_shnum - 1U)
1210	return VERR_LDR_INVALID_SEG_OFFSET;
1211
1212	iSeg++; /* skip section 0 */
1213	if (offSeg > pModElf->paShdrs[iSeg].sh_size)
1214	{
1215	const Elf_Shdr *pShdr2 = RTLDRELF_NAME(GetFirstAllocatedSection)(&pModElf->paShdrs[iSeg + 1],
1216	pModElf->Ehdr.e_shnum - iSeg - 1);
1217	if ( !pShdr2
1218	\|\| offSeg > (pShdr2->sh_addr - pModElf->paShdrs[iSeg].sh_addr))
1219	return VERR_LDR_INVALID_SEG_OFFSET;
1220	}
1221
1222	if (!(pModElf->paShdrs[iSeg].sh_flags & SHF_ALLOC))
1223	return VERR_LDR_INVALID_SEG_OFFSET;
1224
1225	*pRva = pModElf->paShdrs[iSeg].sh_addr;
1226	return VINF_SUCCESS;
1227	}
1228
1229
1230	/** @copydoc RTLDROPS::pfnRvaToSegOffset. */
1231	static DECLCALLBACK(int) RTLDRELF_NAME(RvaToSegOffset)(PRTLDRMODINTERNAL pMod, RTLDRADDR Rva,
1232	uint32_t *piSeg, PRTLDRADDR poffSeg)
1233	{
1234	PRTLDRMODELF pModElf = (PRTLDRMODELF)pMod;
1235
1236	Elf_Addr PrevAddr = 0;
1237	unsigned cLeft = pModElf->Ehdr.e_shnum - 1;
1238	const Elf_Shdr *pShdr = &pModElf->paShdrs[cLeft];
1239	while (cLeft-- > 0)
1240	{
1241	if (pShdr->sh_flags & SHF_ALLOC)
1242	{
1243	Elf_Addr cbSeg = PrevAddr ? PrevAddr - pShdr->sh_addr : pShdr->sh_size;
1244	RTLDRADDR offSeg = Rva - pShdr->sh_addr;
1245	if (offSeg <= cbSeg)
1246	{
1247	*poffSeg = offSeg;
1248	*piSeg = cLeft;
1249	return VINF_SUCCESS;
1250	}
1251	PrevAddr = pShdr->sh_addr;
1252	}
1253	pShdr--;
1254	}
1255
1256	return VERR_LDR_INVALID_RVA;
1257	}
1258
1259
1260	/** @callback_method_impl{FNRTLDRIMPORT, Stub used by ReadDbgInfo.} */
1261	static DECLCALLBACK(int) RTLDRELF_NAME(GetImportStubCallback)(RTLDRMOD hLdrMod, const char pszModule, const char pszSymbol,
1262	unsigned uSymbol, PRTLDRADDR pValue, void *pvUser)
1263	{
1264	return VERR_SYMBOL_NOT_FOUND;
1265	}
1266
1267
1268	/** @copydoc RTLDROPS::pfnRvaToSegOffset. */
1269	static DECLCALLBACK(int) RTLDRELF_NAME(ReadDbgInfo)(PRTLDRMODINTERNAL pMod, uint32_t iDbgInfo, RTFOFF off,
1270	size_t cb, void *pvBuf)
1271	{
1272	PRTLDRMODELF pThis = (PRTLDRMODELF)pMod;
1273	LogFlow(("%s: iDbgInfo=%#x off=%RTfoff cb=%#zu\n", __FUNCTION__, iDbgInfo, off, cb));
1274
1275	/*
1276	* Input validation.
1277	*/
1278	AssertReturn(iDbgInfo < pThis->Ehdr.e_shnum && iDbgInfo + 1 < pThis->Ehdr.e_shnum, VERR_INVALID_PARAMETER);
1279	iDbgInfo++;
1280	AssertReturn(!(pThis->paShdrs[iDbgInfo].sh_flags & SHF_ALLOC), VERR_INVALID_PARAMETER);
1281	AssertReturn(pThis->paShdrs[iDbgInfo].sh_type == SHT_PROGBITS, VERR_INVALID_PARAMETER);
1282	AssertReturn(pThis->paShdrs[iDbgInfo].sh_offset == (uint64_t)off, VERR_INVALID_PARAMETER);
1283	AssertReturn(pThis->paShdrs[iDbgInfo].sh_size == cb, VERR_INVALID_PARAMETER);
1284	RTFOFF cbRawImage = pThis->Core.pReader->pfnSize(pThis->Core.pReader);
1285	AssertReturn(cbRawImage >= 0, VERR_INVALID_PARAMETER);
1286	AssertReturn(off >= 0 && cb <= (uint64_t)cbRawImage && (uint64_t)off + cb <= (uint64_t)cbRawImage, VERR_INVALID_PARAMETER);
1287
1288	/*
1289	* Read it from the file and look for fixup sections.
1290	*/
1291	int rc;
1292	if (pThis->pvBits)
1293	memcpy(pvBuf, (const uint8_t *)pThis->pvBits + (size_t)off, cb);
1294	else
1295	{
1296	rc = pThis->Core.pReader->pfnRead(pThis->Core.pReader, pvBuf, cb, off);
1297	if (RT_FAILURE(rc))
1298	return rc;
1299	}
1300
1301	uint32_t iRelocs = iDbgInfo + 1;
1302	if ( iRelocs >= pThis->Ehdr.e_shnum
1303	\|\| pThis->paShdrs[iRelocs].sh_info != iDbgInfo
1304	\|\| ( pThis->paShdrs[iRelocs].sh_type != SHT_REL
1305	&& pThis->paShdrs[iRelocs].sh_type != SHT_RELA) )
1306	{
1307	iRelocs = 0;
1308	while ( iRelocs < pThis->Ehdr.e_shnum
1309	&& ( pThis->paShdrs[iRelocs].sh_info != iDbgInfo
1310	\|\| ( pThis->paShdrs[iRelocs].sh_type != SHT_REL
1311	&& pThis->paShdrs[iRelocs].sh_type != SHT_RELA)) )
1312	iRelocs++;
1313	}
1314	if ( iRelocs < pThis->Ehdr.e_shnum
1315	&& pThis->paShdrs[iRelocs].sh_size > 0)
1316	{
1317	/*
1318	* Load the relocations.
1319	*/
1320	uint8_t *pbRelocsBuf = NULL;
1321	const uint8_t *pbRelocs;
1322	if (pThis->pvBits)
1323	pbRelocs = (const uint8_t *)pThis->pvBits + pThis->paShdrs[iRelocs].sh_offset;
1324	else
1325	{
1326	pbRelocs = pbRelocsBuf = (uint8_t *)RTMemTmpAlloc(pThis->paShdrs[iRelocs].sh_size);
1327	if (!pbRelocsBuf)
1328	return VERR_NO_TMP_MEMORY;
1329	rc = pThis->Core.pReader->pfnRead(pThis->Core.pReader, pbRelocsBuf,
1330	pThis->paShdrs[iRelocs].sh_size,
1331	pThis->paShdrs[iRelocs].sh_offset);
1332	if (RT_FAILURE(rc))
1333	{
1334	RTMemTmpFree(pbRelocsBuf);
1335	return rc;
1336	}
1337	}
1338
1339	/*
1340	* Apply the relocations.
1341	*/
1342	if (pThis->Ehdr.e_type == ET_REL)
1343	rc = RTLDRELF_NAME(RelocateSection)(pThis, pThis->LinkAddress,
1344	RTLDRELF_NAME(GetImportStubCallback), NULL /pvUser/,
1345	pThis->paShdrs[iDbgInfo].sh_addr,
1346	pThis->paShdrs[iDbgInfo].sh_size,
1347	(const uint8_t *)pvBuf,
1348	(uint8_t *)pvBuf,
1349	pbRelocs,
1350	pThis->paShdrs[iRelocs].sh_size);
1351	else
1352	rc = RTLDRELF_NAME(RelocateSectionExecDyn)(pThis, pThis->LinkAddress,
1353	RTLDRELF_NAME(GetImportStubCallback), NULL /pvUser/,
1354	pThis->paShdrs[iDbgInfo].sh_addr,
1355	pThis->paShdrs[iDbgInfo].sh_size,
1356	(const uint8_t *)pvBuf,
1357	(uint8_t *)pvBuf,
1358	pbRelocs,
1359	pThis->paShdrs[iRelocs].sh_size);
1360
1361	RTMemTmpFree(pbRelocsBuf);
1362	}
1363	else
1364	rc = VINF_SUCCESS;
1365	return rc;
1366	}
1367
1368
1369
1370	/**
1371	* The ELF module operations.
1372	*/
1373	static RTLDROPS RTLDRELF_MID(s_rtldrElf,Ops) =
1374	{
1375	#if ELF_MODE == 32
1376	"elf32",
1377	#elif ELF_MODE == 64
1378	"elf64",
1379	#endif
1380	RTLDRELF_NAME(Close),
1381	NULL, /* Get Symbol */
1382	RTLDRELF_NAME(Done),
1383	RTLDRELF_NAME(EnumSymbols),
1384	/* ext: */
1385	RTLDRELF_NAME(GetImageSize),
1386	RTLDRELF_NAME(GetBits),
1387	RTLDRELF_NAME(Relocate),
1388	RTLDRELF_NAME(GetSymbolEx),
1389	RTLDRELF_NAME(EnumDbgInfo),
1390	RTLDRELF_NAME(EnumSegments),
1391	RTLDRELF_NAME(LinkAddressToSegOffset),
1392	RTLDRELF_NAME(LinkAddressToRva),
1393	RTLDRELF_NAME(SegOffsetToRva),
1394	RTLDRELF_NAME(RvaToSegOffset),
1395	RTLDRELF_NAME(ReadDbgInfo),
1396	42
1397	};
1398
1399
1400
1401	/**
1402	* Validates the ELF header.
1403	*
1404	* @returns iprt status code.
1405	* @param pEhdr Pointer to the ELF header.
1406	* @param pszLogName The log name.
1407	* @param cbRawImage The size of the raw image.
1408	*/
1409	static int RTLDRELF_NAME(ValidateElfHeader)(const Elf_Ehdr pEhdr, const char pszLogName, uint64_t cbRawImage,
1410	PRTLDRARCH penmArch)
1411	{
1412	Log3(("RTLdrELF: e_ident: %.*Rhxs\n"
1413	"RTLdrELF: e_type: " FMT_ELF_HALF "\n"
1414	"RTLdrELF: e_version: " FMT_ELF_HALF "\n"
1415	"RTLdrELF: e_entry: " FMT_ELF_ADDR "\n"
1416	"RTLdrELF: e_phoff: " FMT_ELF_OFF "\n"
1417	"RTLdrELF: e_shoff: " FMT_ELF_OFF "\n"
1418	"RTLdrELF: e_flags: " FMT_ELF_WORD "\n"
1419	"RTLdrELF: e_ehsize: " FMT_ELF_HALF "\n"
1420	"RTLdrELF: e_phentsize: " FMT_ELF_HALF "\n"
1421	"RTLdrELF: e_phnum: " FMT_ELF_HALF "\n"
1422	"RTLdrELF: e_shentsize: " FMT_ELF_HALF "\n"
1423	"RTLdrELF: e_shnum: " FMT_ELF_HALF "\n"
1424	"RTLdrELF: e_shstrndx: " FMT_ELF_HALF "\n",
1425	RT_ELEMENTS(pEhdr->e_ident), &pEhdr->e_ident[0], pEhdr->e_type, pEhdr->e_version,
1426	pEhdr->e_entry, pEhdr->e_phoff, pEhdr->e_shoff,pEhdr->e_flags, pEhdr->e_ehsize, pEhdr->e_phentsize,
1427	pEhdr->e_phnum, pEhdr->e_shentsize, pEhdr->e_shnum, pEhdr->e_shstrndx));
1428
1429	if ( pEhdr->e_ident[EI_MAG0] != ELFMAG0
1430	\|\| pEhdr->e_ident[EI_MAG1] != ELFMAG1
1431	\|\| pEhdr->e_ident[EI_MAG2] != ELFMAG2
1432	\|\| pEhdr->e_ident[EI_MAG3] != ELFMAG3
1433	)
1434	{
1435	Log(("RTLdrELF: %s: Invalid ELF magic (%.*Rhxs)\n", pszLogName, sizeof(pEhdr->e_ident), pEhdr->e_ident)); NOREF(pszLogName);
1436	return VERR_BAD_EXE_FORMAT;
1437	}
1438	if (pEhdr->e_ident[EI_CLASS] != RTLDRELF_SUFF(ELFCLASS))
1439	{
1440	Log(("RTLdrELF: %s: Invalid ELF class (%.*Rhxs)\n", pszLogName, sizeof(pEhdr->e_ident), pEhdr->e_ident));
1441	return VERR_BAD_EXE_FORMAT;
1442	}
1443	if (pEhdr->e_ident[EI_DATA] != ELFDATA2LSB)
1444	{
1445	Log(("RTLdrELF: %s: ELF endian %x is unsupported\n", pEhdr->e_ident[EI_DATA]));
1446	return VERR_LDRELF_ODD_ENDIAN;
1447	}
1448	if (pEhdr->e_version != EV_CURRENT)
1449	{
1450	Log(("RTLdrELF: %s: ELF version %x is unsupported\n", pEhdr->e_version));
1451	return VERR_LDRELF_VERSION;
1452	}
1453
1454	if (sizeof(Elf_Ehdr) != pEhdr->e_ehsize)
1455	{
1456	Log(("RTLdrELF: %s: Elf header e_ehsize is %d expected %d!\n",
1457	pszLogName, pEhdr->e_ehsize, sizeof(Elf_Ehdr)));
1458	return VERR_BAD_EXE_FORMAT;
1459	}
1460	if ( sizeof(Elf_Phdr) != pEhdr->e_phentsize
1461	&& ( pEhdr->e_phnum != 0
1462	\|\| pEhdr->e_type == ET_DYN))
1463	{
1464	Log(("RTLdrELF: %s: Elf header e_phentsize is %d expected %d!\n",
1465	pszLogName, pEhdr->e_phentsize, sizeof(Elf_Phdr)));
1466	return VERR_BAD_EXE_FORMAT;
1467	}
1468	if (sizeof(Elf_Shdr) != pEhdr->e_shentsize)
1469	{
1470	Log(("RTLdrELF: %s: Elf header e_shentsize is %d expected %d!\n",
1471	pszLogName, pEhdr->e_shentsize, sizeof(Elf_Shdr)));
1472	return VERR_BAD_EXE_FORMAT;
1473	}
1474
1475	switch (pEhdr->e_type)
1476	{
1477	case ET_REL:
1478	case ET_EXEC:
1479	case ET_DYN:
1480	break;
1481	default:
1482	Log(("RTLdrELF: %s: image type %#x is not supported!\n", pszLogName, pEhdr->e_type));
1483	return VERR_BAD_EXE_FORMAT;
1484	}
1485
1486	switch (pEhdr->e_machine)
1487	{
1488	#if ELF_MODE == 32
1489	case EM_386:
1490	case EM_486:
1491	*penmArch = RTLDRARCH_X86_32;
1492	break;
1493	#elif ELF_MODE == 64
1494	case EM_X86_64:
1495	*penmArch = RTLDRARCH_AMD64;
1496	break;
1497	#endif
1498	default:
1499	Log(("RTLdrELF: %s: machine type %u is not supported!\n", pEhdr->e_machine));
1500	return VERR_LDRELF_MACHINE;
1501	}
1502
1503	if ( pEhdr->e_phoff < pEhdr->e_ehsize
1504	&& !(pEhdr->e_phoff && pEhdr->e_phnum)
1505	&& pEhdr->e_phnum)
1506	{
1507	Log(("RTLdrELF: %s: The program headers overlap with the ELF header! e_phoff=" FMT_ELF_OFF "\n",
1508	pszLogName, pEhdr->e_phoff));
1509	return VERR_BAD_EXE_FORMAT;
1510	}
1511	if ( pEhdr->e_phoff + pEhdr->e_phnum * pEhdr->e_phentsize > cbRawImage
1512	\|\| pEhdr->e_phoff + pEhdr->e_phnum * pEhdr->e_phentsize < pEhdr->e_phoff)
1513	{
1514	Log(("RTLdrELF: %s: The program headers extends beyond the file! e_phoff=" FMT_ELF_OFF " e_phnum=" FMT_ELF_HALF "\n",
1515	pszLogName, pEhdr->e_phoff, pEhdr->e_phnum));
1516	return VERR_BAD_EXE_FORMAT;
1517	}
1518
1519
1520	if ( pEhdr->e_shoff < pEhdr->e_ehsize
1521	&& !(pEhdr->e_shoff && pEhdr->e_shnum))
1522	{
1523	Log(("RTLdrELF: %s: The section headers overlap with the ELF header! e_shoff=" FMT_ELF_OFF "\n",
1524	pszLogName, pEhdr->e_shoff));
1525	return VERR_BAD_EXE_FORMAT;
1526	}
1527	if ( pEhdr->e_shoff + pEhdr->e_shnum * pEhdr->e_shentsize > cbRawImage
1528	\|\| pEhdr->e_shoff + pEhdr->e_shnum * pEhdr->e_shentsize < pEhdr->e_shoff)
1529	{
1530	Log(("RTLdrELF: %s: The section headers extends beyond the file! e_shoff=" FMT_ELF_OFF " e_shnum=" FMT_ELF_HALF "\n",
1531	pszLogName, pEhdr->e_shoff, pEhdr->e_shnum));
1532	return VERR_BAD_EXE_FORMAT;
1533	}
1534
1535	if (pEhdr->e_shstrndx == 0 \|\| pEhdr->e_shstrndx > pEhdr->e_shnum)
1536	{
1537	Log(("RTLdrELF: %s: The section headers string table is out of bounds! e_shstrndx=" FMT_ELF_HALF " e_shnum=" FMT_ELF_HALF "\n",
1538	pszLogName, pEhdr->e_shstrndx, pEhdr->e_shnum));
1539	return VERR_BAD_EXE_FORMAT;
1540	}
1541
1542	return VINF_SUCCESS;
1543	}
1544
1545	/**
1546	* Gets the section header name.
1547	*
1548	* @returns pszName.
1549	* @param pEhdr The elf header.
1550	* @param offName The offset of the section header name.
1551	* @param pszName Where to store the name.
1552	* @param cbName The size of the buffer pointed to by pszName.
1553	*/
1554	const char RTLDRELF_NAME(GetSHdrName)(PRTLDRMODELF pModElf, Elf_Word offName, char pszName, size_t cbName)
1555	{
1556	RTFOFF off = pModElf->paShdrs[pModElf->Ehdr.e_shstrndx].sh_offset + offName;
1557	int rc = pModElf->Core.pReader->pfnRead(pModElf->Core.pReader, pszName, cbName - 1, off);
1558	if (RT_FAILURE(rc))
1559	{
1560	/* read by for byte. */
1561	for (unsigned i = 0; i < cbName; i++, off++)
1562	{
1563	rc = pModElf->Core.pReader->pfnRead(pModElf->Core.pReader, pszName + i, 1, off);
1564	if (RT_FAILURE(rc))
1565	{
1566	pszName[i] = '\0';
1567	break;
1568	}
1569	}
1570	}
1571
1572	pszName[cbName - 1] = '\0';
1573	return pszName;
1574	}
1575
1576
1577	/**
1578	* Validates a section header.
1579	*
1580	* @returns iprt status code.
1581	* @param pModElf Pointer to the module structure.
1582	* @param iShdr The index of section header which should be validated.
1583	* The section headers are found in the pModElf->paShdrs array.
1584	* @param pszLogName The log name.
1585	* @param cbRawImage The size of the raw image.
1586	*/
1587	static int RTLDRELF_NAME(ValidateSectionHeader)(PRTLDRMODELF pModElf, unsigned iShdr, const char *pszLogName, RTFOFF cbRawImage)
1588	{
1589	const Elf_Shdr *pShdr = &pModElf->paShdrs[iShdr];
1590	char szSectionName[80]; NOREF(szSectionName);
1591	Log3(("RTLdrELF: Section Header #%d:\n"
1592	"RTLdrELF: sh_name: " FMT_ELF_WORD " - %s\n"
1593	"RTLdrELF: sh_type: " FMT_ELF_WORD " (%s)\n"
1594	"RTLdrELF: sh_flags: " FMT_ELF_XWORD "\n"
1595	"RTLdrELF: sh_addr: " FMT_ELF_ADDR "\n"
1596	"RTLdrELF: sh_offset: " FMT_ELF_OFF "\n"
1597	"RTLdrELF: sh_size: " FMT_ELF_XWORD "\n"
1598	"RTLdrELF: sh_link: " FMT_ELF_WORD "\n"
1599	"RTLdrELF: sh_info: " FMT_ELF_WORD "\n"
1600	"RTLdrELF: sh_addralign: " FMT_ELF_XWORD "\n"
1601	"RTLdrELF: sh_entsize: " FMT_ELF_XWORD "\n",
1602	iShdr,
1603	pShdr->sh_name, RTLDRELF_NAME(GetSHdrName)(pModElf, pShdr->sh_name, szSectionName, sizeof(szSectionName)),
1604	pShdr->sh_type, rtldrElfGetShdrType(pShdr->sh_type), pShdr->sh_flags, pShdr->sh_addr,
1605	pShdr->sh_offset, pShdr->sh_size, pShdr->sh_link, pShdr->sh_info, pShdr->sh_addralign,
1606	pShdr->sh_entsize));
1607
1608	if (iShdr == 0)
1609	{
1610	if ( pShdr->sh_name != 0
1611	\|\| pShdr->sh_type != SHT_NULL
1612	\|\| pShdr->sh_flags != 0
1613	\|\| pShdr->sh_addr != 0
1614	\|\| pShdr->sh_size != 0
1615	\|\| pShdr->sh_offset != 0
1616	\|\| pShdr->sh_link != SHN_UNDEF
1617	\|\| pShdr->sh_addralign != 0
1618	\|\| pShdr->sh_entsize != 0 )
1619	{
1620	Log(("RTLdrELF: %s: Bad #0 section: %.Rhxs\n", pszLogName, sizeof(pShdr), pShdr ));
1621	return VERR_BAD_EXE_FORMAT;
1622	}
1623	return VINF_SUCCESS;
1624	}
1625
1626	if (pShdr->sh_name >= pModElf->cbShStr)
1627	{
1628	Log(("RTLdrELF: %s: Shdr #%d: sh_name (%d) is beyond the end of the section header string table (%d)!\n",
1629	pszLogName, iShdr, pShdr->sh_name, pModElf->cbShStr)); NOREF(pszLogName);
1630	return VERR_BAD_EXE_FORMAT;
1631	}
1632
1633	if (pShdr->sh_link >= pModElf->Ehdr.e_shnum)
1634	{
1635	Log(("RTLdrELF: %s: Shdr #%d: sh_link (%d) is beyond the end of the section table (%d)!\n",
1636	pszLogName, iShdr, pShdr->sh_link, pModElf->Ehdr.e_shnum)); NOREF(pszLogName);
1637	return VERR_BAD_EXE_FORMAT;
1638	}
1639
1640	switch (pShdr->sh_type)
1641	{
1642	/** @todo find specs and check up which sh_info fields indicates section table entries */
1643	case 12301230:
1644	if (pShdr->sh_info >= pModElf->Ehdr.e_shnum)
1645	{
1646	Log(("RTLdrELF: %s: Shdr #%d: sh_info (%d) is beyond the end of the section table (%d)!\n",
1647	pszLogName, iShdr, pShdr->sh_link, pModElf->Ehdr.e_shnum));
1648	return VERR_BAD_EXE_FORMAT;
1649	}
1650	break;
1651
1652	case SHT_NULL:
1653	break;
1654	case SHT_PROGBITS:
1655	case SHT_SYMTAB:
1656	case SHT_STRTAB:
1657	case SHT_RELA:
1658	case SHT_HASH:
1659	case SHT_DYNAMIC:
1660	case SHT_NOTE:
1661	case SHT_NOBITS:
1662	case SHT_REL:
1663	case SHT_SHLIB:
1664	case SHT_DYNSYM:
1665	/*
1666	* For these types sh_info doesn't have any special meaning, or anything which
1667	* we need/can validate now.
1668	*/
1669	break;
1670
1671
1672	default:
1673	Log(("RTLdrELF: %s: Warning, unknown type %d!\n", pszLogName, pShdr->sh_type));
1674	break;
1675	}
1676
1677	if ( pShdr->sh_type != SHT_NOBITS
1678	&& pShdr->sh_size)
1679	{
1680	RTFOFF offEnd = pShdr->sh_offset + pShdr->sh_size;
1681	if ( offEnd > cbRawImage
1682	\|\| offEnd < (RTFOFF)pShdr->sh_offset)
1683	{
1684	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",
1685	pszLogName, iShdr, pShdr->sh_offset, pShdr->sh_size, offEnd, cbRawImage));
1686	return VERR_BAD_EXE_FORMAT;
1687	}
1688	if (pShdr->sh_offset < sizeof(Elf_Ehdr))
1689	{
1690	Log(("RTLdrELF: %s: Shdr #%d: sh_offset (" FMT_ELF_OFF ") + sh_size (" FMT_ELF_XWORD ") is starting in the ELF header!\n",
1691	pszLogName, iShdr, pShdr->sh_offset, pShdr->sh_size, cbRawImage));
1692	return VERR_BAD_EXE_FORMAT;
1693	}
1694	}
1695
1696	return VINF_SUCCESS;
1697	}
1698
1699
1700
1701	/**
1702	* Opens an ELF image, fixed bitness.
1703	*
1704	* @returns iprt status code.
1705	* @param pReader The loader reader instance which will provide the raw image bits.
1706	* @param fFlags Reserved, MBZ.
1707	* @param enmArch Architecture specifier.
1708	* @param phLdrMod Where to store the handle.
1709	*/
1710	static int RTLDRELF_NAME(Open)(PRTLDRREADER pReader, uint32_t fFlags, RTLDRARCH enmArch, PRTLDRMOD phLdrMod)
1711	{
1712	const char *pszLogName = pReader->pfnLogName(pReader);
1713	RTFOFF cbRawImage = pReader->pfnSize(pReader);
1714
1715	/*
1716	* Create the loader module instance.
1717	*/
1718	PRTLDRMODELF pModElf = (PRTLDRMODELF)RTMemAllocZ(sizeof(*pModElf));
1719	if (!pModElf)
1720	return VERR_NO_MEMORY;
1721
1722	pModElf->Core.u32Magic = RTLDRMOD_MAGIC;
1723	pModElf->Core.eState = LDR_STATE_INVALID;
1724	pModElf->Core.pReader = pReader;
1725	pModElf->Core.enmFormat = RTLDRFMT_ELF;
1726	pModElf->Core.enmType = RTLDRTYPE_OBJECT;
1727	pModElf->Core.enmEndian = RTLDRENDIAN_LITTLE;
1728	#if ELF_MODE == 32
1729	pModElf->Core.enmArch = RTLDRARCH_X86_32;
1730	#else
1731	pModElf->Core.enmArch = RTLDRARCH_AMD64;
1732	#endif
1733	//pModElf->pvBits = NULL;
1734	//pModElf->Ehdr = {0};
1735	//pModElf->paShdrs = NULL;
1736	//pModElf->paSyms = NULL;
1737	pModElf->iSymSh = ~0U;
1738	//pModElf->cSyms = 0;
1739	pModElf->iStrSh = ~0U;
1740	//pModElf->cbStr = 0;
1741	//pModElf->cbImage = 0;
1742	//pModElf->LinkAddress = 0;
1743	//pModElf->pStr = NULL;
1744	//pModElf->cbShStr = 0;
1745	//pModElf->pShStr = NULL;
1746
1747	/*
1748	* Read and validate the ELF header and match up the CPU architecture.
1749	*/
1750	int rc = pReader->pfnRead(pReader, &pModElf->Ehdr, sizeof(pModElf->Ehdr), 0);
1751	if (RT_SUCCESS(rc))
1752	{
1753	RTLDRARCH enmArchImage = RTLDRARCH_INVALID; /* shut up gcc */
1754	rc = RTLDRELF_NAME(ValidateElfHeader)(&pModElf->Ehdr, pszLogName, cbRawImage, &enmArchImage);
1755	if (RT_SUCCESS(rc))
1756	{
1757	if ( enmArch != RTLDRARCH_WHATEVER
1758	&& enmArch != enmArchImage)
1759	rc = VERR_LDR_ARCH_MISMATCH;
1760	}
1761	}
1762	if (RT_SUCCESS(rc))
1763	{
1764	/*
1765	* Read the section headers, keeping a prestine copy for the module
1766	* introspection methods.
1767	*/
1768	size_t const cbShdrs = pModElf->Ehdr.e_shnum * sizeof(Elf_Shdr);
1769	Elf_Shdr paShdrs = (Elf_Shdr )RTMemAlloc(cbShdrs * 2);
1770	if (paShdrs)
1771	{
1772	pModElf->paShdrs = paShdrs;
1773	rc = pReader->pfnRead(pReader, paShdrs, cbShdrs, pModElf->Ehdr.e_shoff);
1774	if (RT_SUCCESS(rc))
1775	{
1776	memcpy(&paShdrs[pModElf->Ehdr.e_shnum], paShdrs, cbShdrs);
1777	pModElf->paOrgShdrs = &paShdrs[pModElf->Ehdr.e_shnum];
1778
1779	pModElf->cbShStr = paShdrs[pModElf->Ehdr.e_shstrndx].sh_size;
1780
1781	/*
1782	* Validate the section headers and find relevant sections.
1783	*/
1784	for (unsigned i = 0; i < pModElf->Ehdr.e_shnum; i++)
1785	{
1786	rc = RTLDRELF_NAME(ValidateSectionHeader)(pModElf, i, pszLogName, cbRawImage);
1787	if (RT_FAILURE(rc))
1788	break;
1789
1790	/* We're looking for symbol tables. */
1791	if (paShdrs[i].sh_type == SHT_SYMTAB)
1792	{
1793	if (pModElf->iSymSh != ~0U)
1794	{
1795	Log(("RTLdrElf: %s: Multiple symbol tabs! iSymSh=%d i=%d\n", pszLogName, pModElf->iSymSh, i));
1796	rc = VERR_LDRELF_MULTIPLE_SYMTABS;
1797	break;
1798	}
1799	pModElf->iSymSh = i;
1800	pModElf->cSyms = (unsigned)(paShdrs[i].sh_size / sizeof(Elf_Sym));
1801	AssertReturn(pModElf->cSyms == paShdrs[i].sh_size / sizeof(Elf_Sym), VERR_IMAGE_TOO_BIG);
1802	pModElf->iStrSh = paShdrs[i].sh_link;
1803	pModElf->cbStr = (unsigned)paShdrs[pModElf->iStrSh].sh_size;
1804	AssertReturn(pModElf->cbStr == paShdrs[pModElf->iStrSh].sh_size, VERR_IMAGE_TOO_BIG);
1805	}
1806
1807	/* Special checks for the section string table. */
1808	if (i == pModElf->Ehdr.e_shstrndx)
1809	{
1810	if (paShdrs[i].sh_type != SHT_STRTAB)
1811	{
1812	Log(("RTLdrElf: Section header string table is not a SHT_STRTAB: %#x\n", paShdrs[i].sh_type));
1813	rc = VERR_BAD_EXE_FORMAT;
1814	break;
1815	}
1816	if (paShdrs[i].sh_size == 0)
1817	{
1818	Log(("RTLdrElf: Section header string table is empty\n"));
1819	rc = VERR_BAD_EXE_FORMAT;
1820	break;
1821	}
1822	}
1823
1824	} /* for each section header */
1825
1826	/*
1827	* Calculate the image base address if the image isn't relocatable.
1828	*/
1829	if (RT_SUCCESS(rc) && pModElf->Ehdr.e_type != ET_REL)
1830	{
1831	pModElf->LinkAddress = ~(Elf_Addr)0;
1832	for (unsigned i = 0; i < pModElf->Ehdr.e_shnum; i++)
1833	if ( (paShdrs[i].sh_flags & SHF_ALLOC)
1834	&& paShdrs[i].sh_addr < pModElf->LinkAddress)
1835	pModElf->LinkAddress = paShdrs[i].sh_addr;
1836	if (pModElf->LinkAddress == ~(Elf_Addr)0)
1837	{
1838	AssertFailed();
1839	rc = VERR_LDR_GENERAL_FAILURE;
1840	}
1841	}
1842
1843	/*
1844	* Perform allocations / RVA calculations, determine the image size.
1845	*/
1846	if (RT_SUCCESS(rc))
1847	for (unsigned i = 0; i < pModElf->Ehdr.e_shnum; i++)
1848	if (paShdrs[i].sh_flags & SHF_ALLOC)
1849	{
1850	if (pModElf->Ehdr.e_type == ET_REL)
1851	paShdrs[i].sh_addr = paShdrs[i].sh_addralign
1852	? RT_ALIGN_T(pModElf->cbImage, paShdrs[i].sh_addralign, Elf_Addr)
1853	: (Elf_Addr)pModElf->cbImage;
1854	else
1855	paShdrs[i].sh_addr -= pModElf->LinkAddress;
1856	Elf_Addr EndAddr = paShdrs[i].sh_addr + paShdrs[i].sh_size;
1857	if (pModElf->cbImage < EndAddr)
1858	{
1859	pModElf->cbImage = (size_t)EndAddr;
1860	AssertMsgReturn(pModElf->cbImage == EndAddr, (FMT_ELF_ADDR "\n", EndAddr), VERR_IMAGE_TOO_BIG);
1861	}
1862	Log2(("RTLdrElf: %s: Assigned " FMT_ELF_ADDR " to section #%d\n", pszLogName, paShdrs[i].sh_addr, i));
1863	}
1864
1865	Log2(("RTLdrElf: iSymSh=%u cSyms=%u iStrSh=%u cbStr=%u rc=%Rrc cbImage=%#zx LinkAddress=" FMT_ELF_ADDR "\n",
1866	pModElf->iSymSh, pModElf->cSyms, pModElf->iStrSh, pModElf->cbStr, rc,
1867	pModElf->cbImage, pModElf->LinkAddress));
1868	if (RT_SUCCESS(rc))
1869	{
1870	pModElf->Core.pOps = &RTLDRELF_MID(s_rtldrElf,Ops);
1871	pModElf->Core.eState = LDR_STATE_OPENED;
1872	*phLdrMod = &pModElf->Core;
1873
1874	LogFlow(("%s: %s: returns VINF_SUCCESS phLdrMod=%p\n", __FUNCTION__, pszLogName, phLdrMod));
1875	return VINF_SUCCESS;
1876	}
1877	}
1878
1879	RTMemFree(paShdrs);
1880	}
1881	else
1882	rc = VERR_NO_MEMORY;
1883	}
1884
1885	RTMemFree(pModElf);
1886	LogFlow(("%s: returns %Rrc\n", __FUNCTION__, rc));
1887	return rc;
1888	}
1889
1890
1891
1892
1893	/*******************************************************************************
1894	* Cleanup Constants And Macros *
1895	*******************************************************************************/
1896	#undef RTLDRELF_NAME
1897	#undef RTLDRELF_SUFF
1898	#undef RTLDRELF_MID
1899
1900	#undef FMT_ELF_ADDR
1901	#undef FMT_ELF_HALF
1902	#undef FMT_ELF_SHALF
1903	#undef FMT_ELF_OFF
1904	#undef FMT_ELF_SIZE
1905	#undef FMT_ELF_SWORD
1906	#undef FMT_ELF_WORD
1907	#undef FMT_ELF_XWORD
1908	#undef FMT_ELF_SXWORD
1909
1910	#undef Elf_Ehdr
1911	#undef Elf_Phdr
1912	#undef Elf_Shdr
1913	#undef Elf_Sym
1914	#undef Elf_Rel
1915	#undef Elf_Rela
1916	#undef Elf_Reloc
1917	#undef Elf_Nhdr
1918	#undef Elf_Dyn
1919
1920	#undef Elf_Addr
1921	#undef Elf_Half
1922	#undef Elf_Off
1923	#undef Elf_Size
1924	#undef Elf_Sword
1925	#undef Elf_Word
1926
1927	#undef RTLDRMODELF
1928	#undef PRTLDRMODELF
1929
1930	#undef ELF_R_SYM
1931	#undef ELF_R_TYPE
1932	#undef ELF_R_INFO
1933
1934	#undef ELF_ST_BIND
1935

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source: vbox/trunk/src/VBox/Runtime/common/ldr/ldrELFRelocatable.cpp.h@ 46474

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