ldrELFRelocatable.cpp.h@ 56978

Last change on this file since 56978 was 56978, checked in by vboxsync, 9 years ago
Runtime: Formatting fixes, time.cpp being the most significant.
Property svn:eol-style set to `native` Property svn:keywords set to `Id`
File size: 74.4 KB

Line
1	/* $Id: ldrELFRelocatable.cpp.h 56978 2015-07-18 18:55:25Z vboxsync $ */
2	/** @file
3	* IPRT - Binary Image Loader, Template for ELF Relocatable Images.
4	*/
5
6	/*
7	* Copyright (C) 2006-2015 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	AssertMsgReturn(pSym->st_shndx < pModElf->cSyms \|\| pSym->st_shndx == SHN_ABS, ("%#x\n", pSym->st_shndx),
253	VERR_LDRELF_INVALID_RELOCATION_OFFSET);
254	#if ELF_MODE == 64
255	SymValue = pSym->st_value;
256	#endif
257	}
258
259	#if ELF_MODE == 64
260	/* Calc the value. */
261	Elf_Addr Value;
262	if (pSym->st_shndx < pModElf->cSyms)
263	Value = SymValue + offDelta;
264	else
265	Value = SymValue + paRels[iRel].r_addend;
266	#endif
267
268	/*
269	* Apply the fixup.
270	*/
271	AssertMsgReturn(paRels[iRel].r_offset < cbSec, (FMT_ELF_ADDR " " FMT_ELF_SIZE "\n", paRels[iRel].r_offset, cbSec), VERR_LDRELF_INVALID_RELOCATION_OFFSET);
272	#if ELF_MODE == 32
273	const Elf_Addr pAddrR = (const Elf_Addr )(pu8SecBaseR + paRels[iRel].r_offset); /* Where to read the addend. */
274	#endif
275	Elf_Addr pAddrW = (Elf_Addr )(pu8SecBaseW + paRels[iRel].r_offset); /* Where to write the fixup. */
276	switch (ELF_R_TYPE(paRels[iRel].r_info))
277	{
278	#if ELF_MODE == 32
279	/*
280	* Absolute addressing.
281	*/
282	case R_386_32:
283	{
284	Elf_Addr Value;
285	if (pSym->st_shndx < pModElf->Ehdr.e_shnum)
286	Value = pAddrR + offDelta; / Simplified. */
287	else if (pSym->st_shndx == SHN_ABS)
288	continue; /* Internal fixup, no need to apply it. */
289	else if (pSym->st_shndx == SHN_UNDEF)
290	Value = SymValue + *pAddrR;
291	else
292	AssertFailedReturn(VERR_LDR_GENERAL_FAILURE); /** @todo SHN_COMMON */
293	(uint32_t )pAddrW = Value;
294	Log4((FMT_ELF_ADDR": R_386_32 Value=" FMT_ELF_ADDR "\n", SecAddr + paRels[iRel].r_offset + BaseAddr, Value));
295	break;
296	}
297
298	/*
299	* PC relative addressing.
300	*/
301	case R_386_PC32:
302	{
303	Elf_Addr Value;
304	if (pSym->st_shndx < pModElf->Ehdr.e_shnum)
305	continue; /* Internal fixup, no need to apply it. */
306	else if (pSym->st_shndx == SHN_ABS)
307	Value = pAddrR + offDelta; / Simplified. */
308	else if (pSym->st_shndx == SHN_UNDEF)
309	{
310	const Elf_Addr SourceAddr = SecAddr + paRels[iRel].r_offset + BaseAddr; /* Where the source really is. */
311	Value = SymValue + (uint32_t )pAddrR - SourceAddr;
312	(uint32_t )pAddrW = Value;
313	}
314	else
315	AssertFailedReturn(VERR_LDR_GENERAL_FAILURE); /** @todo SHN_COMMON */
316	Log4((FMT_ELF_ADDR": R_386_PC32 Value=" FMT_ELF_ADDR "\n", SecAddr + paRels[iRel].r_offset + BaseAddr, Value));
317	break;
318	}
319
320	#elif ELF_MODE == 64
321
322	/*
323	* Absolute addressing
324	*/
325	case R_X86_64_64:
326	{
327	(uint64_t )pAddrW = Value;
328	Log4((FMT_ELF_ADDR": R_X86_64_64 Value=" FMT_ELF_ADDR " SymValue=" FMT_ELF_ADDR "\n",
329	SecAddr + paRels[iRel].r_offset + BaseAddr, Value, SymValue));
330	break;
331	}
332
333	/*
334	* Truncated 32-bit value (zero-extendedable to the 64-bit value).
335	*/
336	case R_X86_64_32:
337	{
338	(uint32_t )pAddrW = (uint32_t)Value;
339	Log4((FMT_ELF_ADDR": R_X86_64_32 Value=" FMT_ELF_ADDR " SymValue=" FMT_ELF_ADDR "\n",
340	SecAddr + paRels[iRel].r_offset + BaseAddr, Value, SymValue));
341	AssertMsgReturn((Elf_Addr)(uint32_t )pAddrW == SymValue, ("Value=" FMT_ELF_ADDR "\n", SymValue),
342	VERR_SYMBOL_VALUE_TOO_BIG);
343	break;
344	}
345
346	/*
347	* Truncated 32-bit value (sign-extendedable to the 64-bit value).
348	*/
349	case R_X86_64_32S:
350	{
351	(int32_t )pAddrW = (int32_t)Value;
352	Log4((FMT_ELF_ADDR": R_X86_64_32S Value=" FMT_ELF_ADDR " SymValue=" FMT_ELF_ADDR "\n",
353	SecAddr + paRels[iRel].r_offset + BaseAddr, Value, SymValue));
354	AssertMsgReturn((Elf_Addr)(int32_t )pAddrW == Value, ("Value=" FMT_ELF_ADDR "\n", Value), VERR_SYMBOL_VALUE_TOO_BIG); /** @todo check the sign-extending here. */
355	break;
356	}
357
358	/*
359	* PC relative addressing.
360	*/
361	case R_X86_64_PC32:
362	{
363	const Elf_Addr SourceAddr = SecAddr + paRels[iRel].r_offset + BaseAddr; /* Where the source really is. */
364	Value -= SourceAddr;
365	(int32_t )pAddrW = (int32_t)Value;
366	Log4((FMT_ELF_ADDR": R_X86_64_PC32 Value=" FMT_ELF_ADDR " SymValue=" FMT_ELF_ADDR "\n",
367	SourceAddr, Value, SymValue));
368	AssertMsgReturn((Elf_Addr)(int32_t )pAddrW == Value, ("Value=" FMT_ELF_ADDR "\n", Value), VERR_SYMBOL_VALUE_TOO_BIG); /** @todo check the sign-extending here. */
369	break;
370	}
371	#endif
372
373	default:
374	AssertMsgFailed(("Unknown relocation type: %d (iRel=%d iRelMax=%d)\n",
375	ELF_R_TYPE(paRels[iRel].r_info), iRel, iRelMax));
376	return VERR_LDRELF_RELOCATION_NOT_SUPPORTED;
377	}
378	}
379
380	return VINF_SUCCESS;
381	}
382
383
384
385	/*
386	*
387	* REL
388	* REL
389	* REL
390	* REL
391	* REL
392	*
393	*/
394
395	/**
396	* Get the symbol and symbol value.
397	*
398	* @returns iprt status code.
399	* @param pModElf The ELF loader module instance data.
400	* @param BaseAddr The base address which the module is being fixedup to.
401	* @param pfnGetImport The callback function to use to resolve imports (aka unresolved externals).
402	* @param pvUser User argument to pass to the callback.
403	* @param iSym The symbol to get.
404	* @param ppSym Where to store the symbol pointer on success. (read only)
405	* @param pSymValue Where to store the symbol value on success.
406	*/
407	static int RTLDRELF_NAME(Symbol)(PRTLDRMODELF pModElf, Elf_Addr BaseAddr, PFNRTLDRIMPORT pfnGetImport, void *pvUser,
408	Elf_Size iSym, const Elf_Sym *ppSym, Elf_Addr pSymValue)
409	{
410	/*
411	* Validate and find the symbol.
412	*/
413	if (iSym >= pModElf->cSyms)
414	{
415	AssertMsgFailed(("iSym=%d is an invalid symbol index!\n", iSym));
416	return VERR_LDRELF_INVALID_SYMBOL_INDEX;
417	}
418	const Elf_Sym *pSym = &pModElf->paSyms[iSym];
419	*ppSym = pSym;
420
421	if (pSym->st_name >= pModElf->cbStr)
422	{
423	AssertMsgFailed(("iSym=%d st_name=%d str sh_size=%d\n", iSym, pSym->st_name, pModElf->cbStr));
424	return VERR_LDRELF_INVALID_SYMBOL_NAME_OFFSET;
425	}
426	const char *pszName = ELF_STR(pModElf, pSym->st_name);
427
428	/*
429	* Determine the symbol value.
430	*
431	* Symbols needs different treatment depending on which section their are in.
432	* Undefined and absolute symbols goes into special non-existing sections.
433	*/
434	switch (pSym->st_shndx)
435	{
436	/*
437	* Undefined symbol, needs resolving.
438	*
439	* Since ELF has no generic concept of importing from specific module (the OS/2 ELF format
440	* has but that's a OS extension and only applies to programs and dlls), we'll have to ask
441	* the resolver callback to do a global search.
442	*/
443	case SHN_UNDEF:
444	{
445	/* Try to resolve the symbol. */
446	RTUINTPTR Value;
447	int rc = pfnGetImport(&pModElf->Core, "", pszName, ~0, &Value, pvUser);
448	if (RT_FAILURE(rc))
449	{
450	AssertMsgFailed(("Failed to resolve '%s' rc=%Rrc\n", pszName, rc));
451	return rc;
452	}
453	*pSymValue = (Elf_Addr)Value;
454	if ((RTUINTPTR)*pSymValue != Value)
455	{
456	AssertMsgFailed(("Symbol value overflowed! '%s'\n", pszName));
457	return VERR_SYMBOL_VALUE_TOO_BIG;
458	}
459
460	Log2(("rtldrELF: #%-3d - UNDEF " FMT_ELF_ADDR " '%s'\n", iSym, *pSymValue, pszName));
461	break;
462	}
463
464	/*
465	* Absolute symbols needs no fixing since they are, well, absolute.
466	*/
467	case SHN_ABS:
468	*pSymValue = pSym->st_value;
469	Log2(("rtldrELF: #%-3d - ABS " FMT_ELF_ADDR " '%s'\n", iSym, *pSymValue, pszName));
470	break;
471
472	/*
473	* All other symbols are addressed relative to their section and need to be fixed up.
474	*/
475	default:
476	if (pSym->st_shndx >= pModElf->Ehdr.e_shnum)
477	{
478	/* what about common symbols? */
479	AssertMsg(pSym->st_shndx < pModElf->Ehdr.e_shnum,
480	("iSym=%d st_shndx=%d e_shnum=%d pszName=%s\n", iSym, pSym->st_shndx, pModElf->Ehdr.e_shnum, pszName));
481	return VERR_BAD_EXE_FORMAT;
482	}
483	*pSymValue = pSym->st_value + pModElf->paShdrs[pSym->st_shndx].sh_addr + BaseAddr;
484	Log2(("rtldrELF: #%-3d - %5d " FMT_ELF_ADDR " '%s'\n", iSym, pSym->st_shndx, *pSymValue, pszName));
485	break;
486	}
487
488	return VINF_SUCCESS;
489	}
490
491
492	/**
493	* Applies the fixups for a sections.
494	*
495	* @returns iprt status code.
496	* @param pModElf The ELF loader module instance data.
497	* @param BaseAddr The base address which the module is being fixedup to.
498	* @param pfnGetImport The callback function to use to resolve imports (aka unresolved externals).
499	* @param pvUser User argument to pass to the callback.
500	* @param SecAddr The section address. This is the address the relocations are relative to.
501	* @param cbSec The section size. The relocations must be inside this.
502	* @param pu8SecBaseR Where we read section bits from.
503	* @param pu8SecBaseW Where we write section bits to.
504	* @param pvRelocs Pointer to where we read the relocations from.
505	* @param cbRelocs Size of the relocations.
506	*/
507	static int RTLDRELF_NAME(RelocateSection)(PRTLDRMODELF pModElf, Elf_Addr BaseAddr, PFNRTLDRIMPORT pfnGetImport, void *pvUser,
508	const Elf_Addr SecAddr, Elf_Size cbSec, const uint8_t pu8SecBaseR, uint8_t pu8SecBaseW,
509	const void *pvRelocs, Elf_Size cbRelocs)
510	{
511	#if ELF_MODE != 32
512	NOREF(pu8SecBaseR);
513	#endif
514
515	/*
516	* Iterate the relocations.
517	* The relocations are stored in an array of Elf32_Rel records and covers the entire relocation section.
518	*/
519	const Elf_Reloc paRels = (const Elf_Reloc )pvRelocs;
520	const unsigned iRelMax = (unsigned)(cbRelocs / sizeof(paRels[0]));
521	AssertMsgReturn(iRelMax == cbRelocs / sizeof(paRels[0]), (FMT_ELF_SIZE "\n", cbRelocs / sizeof(paRels[0])), VERR_IMAGE_TOO_BIG);
522	for (unsigned iRel = 0; iRel < iRelMax; iRel++)
523	{
524	/*
525	* Skip R_XXX_NONE entries early to avoid confusion in the symbol
526	* getter code.
527	*/
528	#if ELF_MODE == 32
529	if (ELF_R_TYPE(paRels[iRel].r_info) == R_386_NONE)
530	continue;
531	#elif ELF_MODE == 64
532	if (ELF_R_TYPE(paRels[iRel].r_info) == R_X86_64_NONE)
533	continue;
534	#endif
535
536
537	/*
538	* Get the symbol.
539	*/
540	const Elf_Sym pSym = NULL; / shut up gcc */
541	Elf_Addr SymValue = 0; /* shut up gcc-4 */
542	int rc = RTLDRELF_NAME(Symbol)(pModElf, BaseAddr, pfnGetImport, pvUser, ELF_R_SYM(paRels[iRel].r_info), &pSym, &SymValue);
543	if (RT_FAILURE(rc))
544	return rc;
545
546	Log3(("rtldrELF: " FMT_ELF_ADDR " %02x %06x - " FMT_ELF_ADDR " %3d %02x %s\n",
547	paRels[iRel].r_offset, ELF_R_TYPE(paRels[iRel].r_info), (unsigned)ELF_R_SYM(paRels[iRel].r_info),
548	SymValue, (unsigned)pSym->st_shndx, pSym->st_info, ELF_STR(pModElf, pSym->st_name)));
549
550	/*
551	* Apply the fixup.
552	*/
553	AssertMsgReturn(paRels[iRel].r_offset < cbSec, (FMT_ELF_ADDR " " FMT_ELF_SIZE "\n", paRels[iRel].r_offset, cbSec), VERR_LDRELF_INVALID_RELOCATION_OFFSET);
554	#if ELF_MODE == 32
555	const Elf_Addr pAddrR = (const Elf_Addr )(pu8SecBaseR + paRels[iRel].r_offset); /* Where to read the addend. */
556	#endif
557	Elf_Addr pAddrW = (Elf_Addr )(pu8SecBaseW + paRels[iRel].r_offset); /* Where to write the fixup. */
558	switch (ELF_R_TYPE(paRels[iRel].r_info))
559	{
560	#if ELF_MODE == 32
561	/*
562	* Absolute addressing.
563	*/
564	case R_386_32:
565	{
566	const Elf_Addr Value = SymValue + *pAddrR;
567	(uint32_t )pAddrW = Value;
568	Log4((FMT_ELF_ADDR": R_386_32 Value=" FMT_ELF_ADDR " SymValue=" FMT_ELF_ADDR "\n",
569	SecAddr + paRels[iRel].r_offset + BaseAddr, Value, SymValue));
570	break;
571	}
572
573	/*
574	* PC relative addressing.
575	*/
576	case R_386_PC32:
577	{
578	const Elf_Addr SourceAddr = SecAddr + paRels[iRel].r_offset + BaseAddr; /* Where the source really is. */
579	const Elf_Addr Value = SymValue + (uint32_t )pAddrR - SourceAddr;
580	(uint32_t )pAddrW = Value;
581	Log4((FMT_ELF_ADDR": R_386_PC32 Value=" FMT_ELF_ADDR " SymValue=" FMT_ELF_ADDR "\n",
582	SourceAddr, Value, SymValue));
583	break;
584	}
585
586	/* ignore */
587	case R_386_NONE:
588	break;
589
590	#elif ELF_MODE == 64
591
592	/*
593	* Absolute addressing
594	*/
595	case R_X86_64_64:
596	{
597	const Elf_Addr Value = SymValue + paRels[iRel].r_addend;
598	(uint64_t )pAddrW = Value;
599	Log4((FMT_ELF_ADDR": R_X86_64_64 Value=" FMT_ELF_ADDR " SymValue=" FMT_ELF_ADDR "\n",
600	SecAddr + paRels[iRel].r_offset + BaseAddr, Value, SymValue));
601	break;
602	}
603
604	/*
605	* Truncated 32-bit value (zero-extendedable to the 64-bit value).
606	*/
607	case R_X86_64_32:
608	{
609	const Elf_Addr Value = SymValue + paRels[iRel].r_addend;
610	(uint32_t )pAddrW = (uint32_t)Value;
611	Log4((FMT_ELF_ADDR": R_X86_64_32 Value=" FMT_ELF_ADDR " SymValue=" FMT_ELF_ADDR "\n",
612	SecAddr + paRels[iRel].r_offset + BaseAddr, Value, SymValue));
613	AssertMsgReturn((Elf_Addr)(uint32_t )pAddrW == Value, ("Value=" FMT_ELF_ADDR "\n", Value), VERR_SYMBOL_VALUE_TOO_BIG);
614	break;
615	}
616
617	/*
618	* Truncated 32-bit value (sign-extendedable to the 64-bit value).
619	*/
620	case R_X86_64_32S:
621	{
622	const Elf_Addr Value = SymValue + paRels[iRel].r_addend;
623	(int32_t )pAddrW = (int32_t)Value;
624	Log4((FMT_ELF_ADDR": R_X86_64_32S Value=" FMT_ELF_ADDR " SymValue=" FMT_ELF_ADDR "\n",
625	SecAddr + paRels[iRel].r_offset + BaseAddr, Value, SymValue));
626	AssertMsgReturn((Elf_Addr)(int32_t )pAddrW == Value, ("Value=" FMT_ELF_ADDR "\n", Value), VERR_SYMBOL_VALUE_TOO_BIG); /** @todo check the sign-extending here. */
627	break;
628	}
629
630	/*
631	* PC relative addressing.
632	*/
633	case R_X86_64_PC32:
634	{
635	const Elf_Addr SourceAddr = SecAddr + paRels[iRel].r_offset + BaseAddr; /* Where the source really is. */
636	const Elf_Addr Value = SymValue + paRels[iRel].r_addend - SourceAddr;
637	(int32_t )pAddrW = (int32_t)Value;
638	Log4((FMT_ELF_ADDR": R_X86_64_PC32 Value=" FMT_ELF_ADDR " SymValue=" FMT_ELF_ADDR "\n",
639	SourceAddr, Value, SymValue));
640	AssertMsgReturn((Elf_Addr)(int32_t )pAddrW == Value, ("Value=" FMT_ELF_ADDR "\n", Value), VERR_SYMBOL_VALUE_TOO_BIG); /** @todo check the sign-extending here. */
641	break;
642	}
643
644	/* ignore */
645	case R_X86_64_NONE:
646	break;
647	#endif
648
649	default:
650	AssertMsgFailed(("Unknown relocation type: %d (iRel=%d iRelMax=%d)\n",
651	ELF_R_TYPE(paRels[iRel].r_info), iRel, iRelMax));
652	return VERR_LDRELF_RELOCATION_NOT_SUPPORTED;
653	}
654	}
655
656	return VINF_SUCCESS;
657	}
658
659
660
661	/** @copydoc RTLDROPS::pfnClose */
662	static DECLCALLBACK(int) RTLDRELF_NAME(Close)(PRTLDRMODINTERNAL pMod)
663	{
664	PRTLDRMODELF pModElf = (PRTLDRMODELF)pMod;
665
666	if (pModElf->paShdrs)
667	{
668	RTMemFree(pModElf->paShdrs);
669	pModElf->paShdrs = NULL;
670	}
671
672	pModElf->pvBits = NULL;
673
674	return VINF_SUCCESS;
675	}
676
677
678	/** @copydoc RTLDROPS::Done */
679	static DECLCALLBACK(int) RTLDRELF_NAME(Done)(PRTLDRMODINTERNAL pMod)
680	{
681	NOREF(pMod); /PRTLDRMODELF pModElf = (PRTLDRMODELF)pMod;/
682	/** @todo Have to think more about this .... */
683	return -1;
684	}
685
686
687	/** @copydoc RTLDROPS::EnumSymbols */
688	static DECLCALLBACK(int) RTLDRELF_NAME(EnumSymbols)(PRTLDRMODINTERNAL pMod, unsigned fFlags, const void *pvBits, RTUINTPTR BaseAddress,
689	PFNRTLDRENUMSYMS pfnCallback, void *pvUser)
690	{
691	PRTLDRMODELF pModElf = (PRTLDRMODELF)pMod;
692	NOREF(pvBits);
693
694	/*
695	* Validate the input.
696	*/
697	Elf_Addr BaseAddr = (Elf_Addr)BaseAddress;
698	AssertMsgReturn((RTUINTPTR)BaseAddr == BaseAddress, ("%RTptr", BaseAddress), VERR_IMAGE_BASE_TOO_HIGH);
699
700	/*
701	* Make sure we've got the string and symbol tables. (We don't need the pvBits.)
702	*/
703	int rc = RTLDRELF_NAME(MapBits)(pModElf, false);
704	if (RT_FAILURE(rc))
705	return rc;
706
707	/*
708	* Enumerate the symbol table.
709	*/
710	const Elf_Sym *paSyms = pModElf->paSyms;
711	unsigned cSyms = pModElf->cSyms;
712	for (unsigned iSym = 1; iSym < cSyms; iSym++)
713	{
714	/*
715	* Skip imports (undefined).
716	*/
717	if (paSyms[iSym].st_shndx != SHN_UNDEF)
718	{
719	/*
720	* Calc value and get name.
721	*/
722	Elf_Addr Value;
723	if (paSyms[iSym].st_shndx == SHN_ABS)
724	/* absolute symbols are not subject to any relocation. */
725	Value = paSyms[iSym].st_value;
726	else if (paSyms[iSym].st_shndx < pModElf->Ehdr.e_shnum)
727	{
728	if (pModElf->Ehdr.e_type == ET_REL)
729	/* relative to the section. */
730	Value = BaseAddr + paSyms[iSym].st_value + pModElf->paShdrs[paSyms[iSym].st_shndx].sh_addr;
731	else /* Fixed up for link address. */
732	Value = BaseAddr + paSyms[iSym].st_value - pModElf->LinkAddress;
733	}
734	else
735	{
736	AssertMsgFailed(("Arg! paSyms[%u].st_shndx=" FMT_ELF_HALF "\n", iSym, paSyms[iSym].st_shndx));
737	return VERR_BAD_EXE_FORMAT;
738	}
739	const char *pszName = ELF_STR(pModElf, paSyms[iSym].st_name);
740	if ( (pszName && *pszName)
741	&& ( (fFlags & RTLDR_ENUM_SYMBOL_FLAGS_ALL)
742	\|\| ELF_ST_BIND(paSyms[iSym].st_info) == STB_GLOBAL)
743	)
744	{
745	/*
746	* Call back.
747	*/
748	AssertMsgReturn(Value == (RTUINTPTR)Value, (FMT_ELF_ADDR "\n", Value), VERR_SYMBOL_VALUE_TOO_BIG);
749	rc = pfnCallback(pMod, pszName, ~0, (RTUINTPTR)Value, pvUser);
750	if (rc)
751	return rc;
752	}
753	}
754	}
755
756	return VINF_SUCCESS;
757	}
758
759
760	/** @copydoc RTLDROPS::GetImageSize */
761	static DECLCALLBACK(size_t) RTLDRELF_NAME(GetImageSize)(PRTLDRMODINTERNAL pMod)
762	{
763	PRTLDRMODELF pModElf = (PRTLDRMODELF)pMod;
764
765	return pModElf->cbImage;
766	}
767
768
769	/** @copydoc RTLDROPS::GetBits */
770	static DECLCALLBACK(int) RTLDRELF_NAME(GetBits)(PRTLDRMODINTERNAL pMod, void pvBits, RTUINTPTR BaseAddress, PFNRTLDRIMPORT pfnGetImport, void pvUser)
771	{
772	PRTLDRMODELF pModElf = (PRTLDRMODELF)pMod;
773
774	/*
775	* This operation is currently only available on relocatable images.
776	*/
777	switch (pModElf->Ehdr.e_type)
778	{
779	case ET_REL:
780	break;
781	case ET_EXEC:
782	Log(("RTLdrELF: %s: Executable images are not supported yet!\n", pModElf->Core.pReader->pfnLogName(pModElf->Core.pReader)));
783	return VERR_LDRELF_EXEC;
784	case ET_DYN:
785	Log(("RTLdrELF: %s: Dynamic images are not supported yet!\n", pModElf->Core.pReader->pfnLogName(pModElf->Core.pReader)));
786	return VERR_LDRELF_DYN;
787	default: AssertFailedReturn(VERR_BAD_EXE_FORMAT);
788	}
789
790	/*
791	* Load the bits into pvBits.
792	*/
793	const Elf_Shdr *paShdrs = pModElf->paShdrs;
794	for (unsigned iShdr = 0; iShdr < pModElf->Ehdr.e_shnum; iShdr++)
795	{
796	if (paShdrs[iShdr].sh_flags & SHF_ALLOC)
797	{
798	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);
799	switch (paShdrs[iShdr].sh_type)
800	{
801	case SHT_NOBITS:
802	memset((uint8_t *)pvBits + paShdrs[iShdr].sh_addr, 0, (size_t)paShdrs[iShdr].sh_size);
803	break;
804
805	case SHT_PROGBITS:
806	default:
807	{
808	int rc = pModElf->Core.pReader->pfnRead(pModElf->Core.pReader, (uint8_t *)pvBits + paShdrs[iShdr].sh_addr,
809	(size_t)paShdrs[iShdr].sh_size, paShdrs[iShdr].sh_offset);
810	if (RT_FAILURE(rc))
811	{
812	Log(("RTLdrELF: %s: Read error when reading " FMT_ELF_SIZE " bytes at " FMT_ELF_OFF ", iShdr=%d\n",
813	pModElf->Core.pReader->pfnLogName(pModElf->Core.pReader),
814	paShdrs[iShdr].sh_size, paShdrs[iShdr].sh_offset, iShdr));
815	return rc;
816	}
817	}
818	}
819	}
820	}
821
822	/*
823	* Relocate the image.
824	*/
825	return pModElf->Core.pOps->pfnRelocate(pMod, pvBits, BaseAddress, ~(RTUINTPTR)0, pfnGetImport, pvUser);
826	}
827
828
829	/** @copydoc RTLDROPS::Relocate */
830	static DECLCALLBACK(int) RTLDRELF_NAME(Relocate)(PRTLDRMODINTERNAL pMod, void *pvBits, RTUINTPTR NewBaseAddress,
831	RTUINTPTR OldBaseAddress, PFNRTLDRIMPORT pfnGetImport, void *pvUser)
832	{
833	PRTLDRMODELF pModElf = (PRTLDRMODELF)pMod;
834	#ifdef LOG_ENABLED
835	const char *pszLogName = pModElf->Core.pReader->pfnLogName(pModElf->Core.pReader);
836	#endif
837	NOREF(OldBaseAddress);
838
839	/*
840	* This operation is currently only available on relocatable images.
841	*/
842	switch (pModElf->Ehdr.e_type)
843	{
844	case ET_REL:
845	break;
846	case ET_EXEC:
847	Log(("RTLdrELF: %s: Executable images are not supported yet!\n", pszLogName));
848	return VERR_LDRELF_EXEC;
849	case ET_DYN:
850	Log(("RTLdrELF: %s: Dynamic images are not supported yet!\n", pszLogName));
851	return VERR_LDRELF_DYN;
852	default: AssertFailedReturn(VERR_BAD_EXE_FORMAT);
853	}
854
855	/*
856	* Validate the input.
857	*/
858	Elf_Addr BaseAddr = (Elf_Addr)NewBaseAddress;
859	AssertMsgReturn((RTUINTPTR)BaseAddr == NewBaseAddress, ("%RTptr", NewBaseAddress), VERR_IMAGE_BASE_TOO_HIGH);
860
861	/*
862	* Map the image bits if not already done and setup pointer into it.
863	*/
864	int rc = RTLDRELF_NAME(MapBits)(pModElf, true);
865	if (RT_FAILURE(rc))
866	return rc;
867
868	/*
869	* Iterate the sections looking for interesting SHT_REL[A] sections.
870	* SHT_REL[A] sections have the section index of the section they contain fixups
871	* for in the sh_info member.
872	*/
873	const Elf_Shdr *paShdrs = pModElf->paShdrs;
874	Log2(("rtLdrElf: %s: Fixing up image\n", pszLogName));
875	for (unsigned iShdr = 0; iShdr < pModElf->Ehdr.e_shnum; iShdr++)
876	{
877	const Elf_Shdr *pShdrRel = &paShdrs[iShdr];
878
879	/*
880	* Skip sections without interest to us.
881	*/
882	#if ELF_MODE == 32
883	if (pShdrRel->sh_type != SHT_REL)
884	#else
885	if (pShdrRel->sh_type != SHT_RELA)
886	#endif
887	continue;
888	if (pShdrRel->sh_info >= pModElf->Ehdr.e_shnum)
889	continue;
890	const Elf_Shdr pShdr = &paShdrs[pShdrRel->sh_info]; / the section to fixup. */
891	if (!(pShdr->sh_flags & SHF_ALLOC))
892	continue;
893
894	/*
895	* Relocate the section.
896	*/
897	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",
898	pszLogName, (int)pShdrRel->sh_info, ELF_SH_STR(pModElf, pShdr->sh_name), (int)pShdr->sh_info, (int)pShdr->sh_link,
899	iShdr, ELF_SH_STR(pModElf, pShdrRel->sh_name), (int)pShdrRel->sh_info, (int)pShdrRel->sh_link));
900
901	/** @todo Make RelocateSection a function pointer so we can select the one corresponding to the machine when opening the image. */
902	if (pModElf->Ehdr.e_type == ET_REL)
903	rc = RTLDRELF_NAME(RelocateSection)(pModElf, BaseAddr, pfnGetImport, pvUser,
904	pShdr->sh_addr,
905	pShdr->sh_size,
906	(const uint8_t *)pModElf->pvBits + pShdr->sh_offset,
907	(uint8_t *)pvBits + pShdr->sh_addr,
908	(const uint8_t *)pModElf->pvBits + pShdrRel->sh_offset,
909	pShdrRel->sh_size);
910	else
911	rc = RTLDRELF_NAME(RelocateSectionExecDyn)(pModElf, BaseAddr, pfnGetImport, pvUser,
912	pShdr->sh_addr,
913	pShdr->sh_size,
914	(const uint8_t *)pModElf->pvBits + pShdr->sh_offset,
915	(uint8_t *)pvBits + pShdr->sh_addr,
916	(const uint8_t *)pModElf->pvBits + pShdrRel->sh_offset,
917	pShdrRel->sh_size);
918	if (RT_FAILURE(rc))
919	return rc;
920	}
921	return VINF_SUCCESS;
922	}
923
924
925	/**
926	* Worker for pfnGetSymbolEx.
927	*/
928	static int RTLDRELF_NAME(ReturnSymbol)(PRTLDRMODELF pThis, const Elf_Sym *pSym, Elf_Addr uBaseAddr, PRTUINTPTR pValue)
929	{
930	Elf_Addr Value;
931	if (pSym->st_shndx == SHN_ABS)
932	/* absolute symbols are not subject to any relocation. */
933	Value = pSym->st_value;
934	else if (pSym->st_shndx < pThis->Ehdr.e_shnum)
935	{
936	if (pThis->Ehdr.e_type == ET_REL)
937	/* relative to the section. */
938	Value = uBaseAddr + pSym->st_value + pThis->paShdrs[pSym->st_shndx].sh_addr;
939	else /* Fixed up for link address. */
940	Value = uBaseAddr + pSym->st_value - pThis->LinkAddress;
941	}
942	else
943	{
944	AssertMsgFailed(("Arg! pSym->st_shndx=%d\n", pSym->st_shndx));
945	return VERR_BAD_EXE_FORMAT;
946	}
947	AssertMsgReturn(Value == (RTUINTPTR)Value, (FMT_ELF_ADDR "\n", Value), VERR_SYMBOL_VALUE_TOO_BIG);
948	*pValue = (RTUINTPTR)Value;
949	return VINF_SUCCESS;
950	}
951
952
953	/** @copydoc RTLDROPS::pfnGetSymbolEx */
954	static DECLCALLBACK(int) RTLDRELF_NAME(GetSymbolEx)(PRTLDRMODINTERNAL pMod, const void *pvBits, RTUINTPTR BaseAddress,
955	uint32_t iOrdinal, const char pszSymbol, RTUINTPTR pValue)
956	{
957	PRTLDRMODELF pModElf = (PRTLDRMODELF)pMod;
958	NOREF(pvBits);
959
960	/*
961	* Validate the input.
962	*/
963	Elf_Addr uBaseAddr = (Elf_Addr)BaseAddress;
964	AssertMsgReturn((RTUINTPTR)uBaseAddr == BaseAddress, ("%RTptr", BaseAddress), VERR_IMAGE_BASE_TOO_HIGH);
965
966	/*
967	* Map the image bits if not already done and setup pointer into it.
968	*/
969	int rc = RTLDRELF_NAME(MapBits)(pModElf, true);
970	if (RT_FAILURE(rc))
971	return rc;
972
973	/*
974	* Calc all kinds of pointers before we start iterating the symbol table.
975	*/
976	const Elf_Sym *paSyms = pModElf->paSyms;
977	unsigned cSyms = pModElf->cSyms;
978	if (iOrdinal == UINT32_MAX)
979	{
980	const char *pStr = pModElf->pStr;
981	for (unsigned iSym = 1; iSym < cSyms; iSym++)
982	{
983	/* Undefined symbols are not exports, they are imports. */
984	if ( paSyms[iSym].st_shndx != SHN_UNDEF
985	&& ( ELF_ST_BIND(paSyms[iSym].st_info) == STB_GLOBAL
986	\|\| ELF_ST_BIND(paSyms[iSym].st_info) == STB_WEAK))
987	{
988	/* Validate the name string and try match with it. */
989	if (paSyms[iSym].st_name < pModElf->cbStr)
990	{
991	if (!strcmp(pszSymbol, pStr + paSyms[iSym].st_name))
992	{
993	/* matched! */
994	return RTLDRELF_NAME(ReturnSymbol)(pModElf, &paSyms[iSym], uBaseAddr, pValue);
995	}
996	}
997	else
998	{
999	AssertMsgFailed(("String outside string table! iSym=%d paSyms[iSym].st_name=%#x\n", iSym, paSyms[iSym].st_name));
1000	return VERR_LDRELF_INVALID_SYMBOL_NAME_OFFSET;
1001	}
1002	}
1003	}
1004	}
1005	else if (iOrdinal < cSyms)
1006	{
1007	if ( paSyms[iOrdinal].st_shndx != SHN_UNDEF
1008	&& ( ELF_ST_BIND(paSyms[iOrdinal].st_info) == STB_GLOBAL
1009	\|\| ELF_ST_BIND(paSyms[iOrdinal].st_info) == STB_WEAK))
1010	return RTLDRELF_NAME(ReturnSymbol)(pModElf, &paSyms[iOrdinal], uBaseAddr, pValue);
1011	}
1012
1013	return VERR_SYMBOL_NOT_FOUND;
1014	}
1015
1016
1017	/** @copydoc RTLDROPS::pfnEnumDbgInfo */
1018	static DECLCALLBACK(int) RTLDRELF_NAME(EnumDbgInfo)(PRTLDRMODINTERNAL pMod, const void *pvBits,
1019	PFNRTLDRENUMDBG pfnCallback, void *pvUser)
1020	{
1021	PRTLDRMODELF pModElf = (PRTLDRMODELF)pMod;
1022
1023	/*
1024	* Map the image bits if not already done and setup pointer into it.
1025	*/
1026	int rc = RTLDRELF_NAME(MapBits)(pModElf, true);
1027	if (RT_FAILURE(rc))
1028	return rc;
1029
1030	/*
1031	* Do the enumeration.
1032	*/
1033	const Elf_Shdr *paShdrs = pModElf->paOrgShdrs;
1034	for (unsigned iShdr = 0; iShdr < pModElf->Ehdr.e_shnum; iShdr++)
1035	{
1036	/* Debug sections are expected to be PROGBITS and not allocated. */
1037	if (paShdrs[iShdr].sh_type != SHT_PROGBITS)
1038	continue;
1039	if (paShdrs[iShdr].sh_flags & SHF_ALLOC)
1040	continue;
1041
1042	RTLDRDBGINFO DbgInfo;
1043	const char *pszSectName = ELF_SH_STR(pModElf, paShdrs[iShdr].sh_name);
1044	if ( !strncmp(pszSectName, RT_STR_TUPLE(".debug_"))
1045	\|\| !strcmp(pszSectName, ".WATCOM_references") )
1046	{
1047	RT_ZERO(DbgInfo.u);
1048	DbgInfo.enmType = RTLDRDBGINFOTYPE_DWARF;
1049	DbgInfo.pszExtFile = NULL;
1050	DbgInfo.offFile = paShdrs[iShdr].sh_offset;
1051	DbgInfo.cb = paShdrs[iShdr].sh_size;
1052	DbgInfo.u.Dwarf.pszSection = pszSectName;
1053	}
1054	else if (!strcmp(pszSectName, ".gnu_debuglink"))
1055	{
1056	if ((paShdrs[iShdr].sh_size & 3) \|\| paShdrs[iShdr].sh_size < 8)
1057	return VERR_BAD_EXE_FORMAT;
1058
1059	RT_ZERO(DbgInfo.u);
1060	DbgInfo.enmType = RTLDRDBGINFOTYPE_DWARF_DWO;
1061	DbgInfo.pszExtFile = (const char *)((uintptr_t)pModElf->pvBits + (uintptr_t)paShdrs[iShdr].sh_offset);
1062	if (!RTStrEnd(DbgInfo.pszExtFile, paShdrs[iShdr].sh_size))
1063	return VERR_BAD_EXE_FORMAT;
1064	DbgInfo.u.Dwo.uCrc32 = (uint32_t )((uintptr_t)DbgInfo.pszExtFile + (uintptr_t)paShdrs[iShdr].sh_size
1065	- sizeof(uint32_t));
1066	DbgInfo.offFile = -1;
1067	DbgInfo.cb = 0;
1068	}
1069	else
1070	continue;
1071
1072	DbgInfo.LinkAddress = NIL_RTLDRADDR;
1073	DbgInfo.iDbgInfo = iShdr - 1;
1074
1075	rc = pfnCallback(pMod, &DbgInfo, pvUser);
1076	if (rc != VINF_SUCCESS)
1077	return rc;
1078
1079	}
1080
1081	return VINF_SUCCESS;
1082	}
1083
1084
1085	/**
1086	* Helper that locates the first allocated section.
1087	*
1088	* @returns Pointer to the section header if found, NULL if none.
1089	* @param pShdr The section header to start searching at.
1090	* @param cLeft The number of section headers left to search. Can be 0.
1091	*/
1092	static const Elf_Shdr RTLDRELF_NAME(GetFirstAllocatedSection)(const Elf_Shdr pShdr, unsigned cLeft)
1093	{
1094	while (cLeft-- > 0)
1095	{
1096	if (pShdr->sh_flags & SHF_ALLOC)
1097	return pShdr;
1098	pShdr++;
1099	}
1100	return NULL;
1101	}
1102
1103	/** @copydoc RTLDROPS::pfnEnumSegments. */
1104	static DECLCALLBACK(int) RTLDRELF_NAME(EnumSegments)(PRTLDRMODINTERNAL pMod, PFNRTLDRENUMSEGS pfnCallback, void *pvUser)
1105	{
1106	PRTLDRMODELF pModElf = (PRTLDRMODELF)pMod;
1107
1108	/*
1109	* Map the image bits if not already done and setup pointer into it.
1110	*/
1111	int rc = RTLDRELF_NAME(MapBits)(pModElf, true);
1112	if (RT_FAILURE(rc))
1113	return rc;
1114
1115	/*
1116	* Do the enumeration.
1117	*/
1118	char szName[32];
1119	Elf_Addr uPrevMappedRva = 0;
1120	const Elf_Shdr *paShdrs = pModElf->paShdrs;
1121	const Elf_Shdr *paOrgShdrs = pModElf->paOrgShdrs;
1122	for (unsigned iShdr = 1; iShdr < pModElf->Ehdr.e_shnum; iShdr++)
1123	{
1124	RTLDRSEG Seg;
1125	Seg.pszName = ELF_SH_STR(pModElf, paShdrs[iShdr].sh_name);
1126	Seg.cchName = (uint32_t)strlen(Seg.pszName);
1127	if (Seg.cchName == 0)
1128	{
1129	Seg.pszName = szName;
1130	Seg.cchName = (uint32_t)RTStrPrintf(szName, sizeof(szName), "UnamedSect%02u", iShdr);
1131	}
1132	Seg.SelFlat = 0;
1133	Seg.Sel16bit = 0;
1134	Seg.fFlags = 0;
1135	Seg.fProt = RTMEM_PROT_READ;
1136	if (paShdrs[iShdr].sh_flags & SHF_WRITE)
1137	Seg.fProt \|= RTMEM_PROT_WRITE;
1138	if (paShdrs[iShdr].sh_flags & SHF_EXECINSTR)
1139	Seg.fProt \|= RTMEM_PROT_EXEC;
1140	Seg.cb = paShdrs[iShdr].sh_size;
1141	Seg.Alignment = paShdrs[iShdr].sh_addralign;
1142	if (paShdrs[iShdr].sh_flags & SHF_ALLOC)
1143	{
1144	Seg.LinkAddress = paOrgShdrs[iShdr].sh_addr;
1145	Seg.RVA = paShdrs[iShdr].sh_addr;
1146	const Elf_Shdr *pShdr2 = RTLDRELF_NAME(GetFirstAllocatedSection)(&paShdrs[iShdr + 1],
1147	pModElf->Ehdr.e_shnum - iShdr - 1);
1148	if ( pShdr2
1149	&& pShdr2->sh_addr >= paShdrs[iShdr].sh_addr
1150	&& Seg.RVA >= uPrevMappedRva)
1151	Seg.cbMapped = pShdr2->sh_addr - paShdrs[iShdr].sh_addr;
1152	else
1153	Seg.cbMapped = RT_MAX(paShdrs[iShdr].sh_size, paShdrs[iShdr].sh_addralign);
1154	uPrevMappedRva = Seg.RVA;
1155	}
1156	else
1157	{
1158	Seg.LinkAddress = NIL_RTLDRADDR;
1159	Seg.RVA = NIL_RTLDRADDR;
1160	Seg.cbMapped = NIL_RTLDRADDR;
1161	}
1162	if (paShdrs[iShdr].sh_type != SHT_NOBITS)
1163	{
1164	Seg.offFile = paShdrs[iShdr].sh_offset;
1165	Seg.cbFile = paShdrs[iShdr].sh_size;
1166	}
1167	else
1168	{
1169	Seg.offFile = -1;
1170	Seg.cbFile = 0;
1171	}
1172
1173	rc = pfnCallback(pMod, &Seg, pvUser);
1174	if (rc != VINF_SUCCESS)
1175	return rc;
1176	}
1177
1178	return VINF_SUCCESS;
1179	}
1180
1181
1182	/** @copydoc RTLDROPS::pfnLinkAddressToSegOffset. */
1183	static DECLCALLBACK(int) RTLDRELF_NAME(LinkAddressToSegOffset)(PRTLDRMODINTERNAL pMod, RTLDRADDR LinkAddress,
1184	uint32_t *piSeg, PRTLDRADDR poffSeg)
1185	{
1186	PRTLDRMODELF pModElf = (PRTLDRMODELF)pMod;
1187
1188	const Elf_Shdr *pShdrEnd = NULL;
1189	unsigned cLeft = pModElf->Ehdr.e_shnum - 1;
1190	const Elf_Shdr *pShdr = &pModElf->paOrgShdrs[cLeft];
1191	while (cLeft-- > 0)
1192	{
1193	if (pShdr->sh_flags & SHF_ALLOC)
1194	{
1195	RTLDRADDR offSeg = LinkAddress - pShdr->sh_addr;
1196	if (offSeg < pShdr->sh_size)
1197	{
1198	*poffSeg = offSeg;
1199	*piSeg = cLeft;
1200	return VINF_SUCCESS;
1201	}
1202	if (offSeg == pShdr->sh_size)
1203	pShdrEnd = pShdr;
1204	}
1205	pShdr--;
1206	}
1207
1208	if (pShdrEnd)
1209	{
1210	*poffSeg = pShdrEnd->sh_size;
1211	*piSeg = pShdrEnd - pModElf->paOrgShdrs - 1;
1212	return VINF_SUCCESS;
1213	}
1214
1215	return VERR_LDR_INVALID_LINK_ADDRESS;
1216	}
1217
1218
1219	/** @copydoc RTLDROPS::pfnLinkAddressToRva. */
1220	static DECLCALLBACK(int) RTLDRELF_NAME(LinkAddressToRva)(PRTLDRMODINTERNAL pMod, RTLDRADDR LinkAddress, PRTLDRADDR pRva)
1221	{
1222	PRTLDRMODELF pModElf = (PRTLDRMODELF)pMod;
1223	uint32_t iSeg;
1224	RTLDRADDR offSeg;
1225	int rc = RTLDRELF_NAME(LinkAddressToSegOffset)(pMod, LinkAddress, &iSeg, &offSeg);
1226	if (RT_SUCCESS(rc))
1227	*pRva = pModElf->paShdrs[iSeg + 1].sh_addr + offSeg;
1228	return rc;
1229	}
1230
1231
1232	/** @copydoc RTLDROPS::pfnSegOffsetToRva. */
1233	static DECLCALLBACK(int) RTLDRELF_NAME(SegOffsetToRva)(PRTLDRMODINTERNAL pMod, uint32_t iSeg, RTLDRADDR offSeg,
1234	PRTLDRADDR pRva)
1235	{
1236	PRTLDRMODELF pModElf = (PRTLDRMODELF)pMod;
1237	if (iSeg >= pModElf->Ehdr.e_shnum - 1U)
1238	return VERR_LDR_INVALID_SEG_OFFSET;
1239
1240	iSeg++; /* skip section 0 */
1241	if (offSeg > pModElf->paShdrs[iSeg].sh_size)
1242	{
1243	const Elf_Shdr *pShdr2 = RTLDRELF_NAME(GetFirstAllocatedSection)(&pModElf->paShdrs[iSeg + 1],
1244	pModElf->Ehdr.e_shnum - iSeg - 1);
1245	if ( !pShdr2
1246	\|\| offSeg > (pShdr2->sh_addr - pModElf->paShdrs[iSeg].sh_addr))
1247	return VERR_LDR_INVALID_SEG_OFFSET;
1248	}
1249
1250	if (!(pModElf->paShdrs[iSeg].sh_flags & SHF_ALLOC))
1251	return VERR_LDR_INVALID_SEG_OFFSET;
1252
1253	*pRva = pModElf->paShdrs[iSeg].sh_addr;
1254	return VINF_SUCCESS;
1255	}
1256
1257
1258	/** @copydoc RTLDROPS::pfnRvaToSegOffset. */
1259	static DECLCALLBACK(int) RTLDRELF_NAME(RvaToSegOffset)(PRTLDRMODINTERNAL pMod, RTLDRADDR Rva,
1260	uint32_t *piSeg, PRTLDRADDR poffSeg)
1261	{
1262	PRTLDRMODELF pModElf = (PRTLDRMODELF)pMod;
1263
1264	Elf_Addr PrevAddr = 0;
1265	unsigned cLeft = pModElf->Ehdr.e_shnum - 1;
1266	const Elf_Shdr *pShdr = &pModElf->paShdrs[cLeft];
1267	while (cLeft-- > 0)
1268	{
1269	if (pShdr->sh_flags & SHF_ALLOC)
1270	{
1271	Elf_Addr cbSeg = PrevAddr ? PrevAddr - pShdr->sh_addr : pShdr->sh_size;
1272	RTLDRADDR offSeg = Rva - pShdr->sh_addr;
1273	if (offSeg <= cbSeg)
1274	{
1275	*poffSeg = offSeg;
1276	*piSeg = cLeft;
1277	return VINF_SUCCESS;
1278	}
1279	PrevAddr = pShdr->sh_addr;
1280	}
1281	pShdr--;
1282	}
1283
1284	return VERR_LDR_INVALID_RVA;
1285	}
1286
1287
1288	/** @callback_method_impl{FNRTLDRIMPORT, Stub used by ReadDbgInfo.} */
1289	static DECLCALLBACK(int) RTLDRELF_NAME(GetImportStubCallback)(RTLDRMOD hLdrMod, const char pszModule, const char pszSymbol,
1290	unsigned uSymbol, PRTLDRADDR pValue, void *pvUser)
1291	{
1292	return VERR_SYMBOL_NOT_FOUND;
1293	}
1294
1295
1296	/** @copydoc RTLDROPS::pfnRvaToSegOffset. */
1297	static DECLCALLBACK(int) RTLDRELF_NAME(ReadDbgInfo)(PRTLDRMODINTERNAL pMod, uint32_t iDbgInfo, RTFOFF off,
1298	size_t cb, void *pvBuf)
1299	{
1300	PRTLDRMODELF pThis = (PRTLDRMODELF)pMod;
1301	LogFlow(("%s: iDbgInfo=%#x off=%RTfoff cb=%#zu\n", __FUNCTION__, iDbgInfo, off, cb));
1302
1303	/*
1304	* Input validation.
1305	*/
1306	AssertReturn(iDbgInfo < pThis->Ehdr.e_shnum && iDbgInfo + 1 < pThis->Ehdr.e_shnum, VERR_INVALID_PARAMETER);
1307	iDbgInfo++;
1308	AssertReturn(!(pThis->paShdrs[iDbgInfo].sh_flags & SHF_ALLOC), VERR_INVALID_PARAMETER);
1309	AssertReturn(pThis->paShdrs[iDbgInfo].sh_type == SHT_PROGBITS, VERR_INVALID_PARAMETER);
1310	AssertReturn(pThis->paShdrs[iDbgInfo].sh_offset == (uint64_t)off, VERR_INVALID_PARAMETER);
1311	AssertReturn(pThis->paShdrs[iDbgInfo].sh_size == cb, VERR_INVALID_PARAMETER);
1312	RTFOFF cbRawImage = pThis->Core.pReader->pfnSize(pThis->Core.pReader);
1313	AssertReturn(cbRawImage >= 0, VERR_INVALID_PARAMETER);
1314	AssertReturn(off >= 0 && cb <= (uint64_t)cbRawImage && (uint64_t)off + cb <= (uint64_t)cbRawImage, VERR_INVALID_PARAMETER);
1315
1316	/*
1317	* Read it from the file and look for fixup sections.
1318	*/
1319	int rc;
1320	if (pThis->pvBits)
1321	memcpy(pvBuf, (const uint8_t *)pThis->pvBits + (size_t)off, cb);
1322	else
1323	{
1324	rc = pThis->Core.pReader->pfnRead(pThis->Core.pReader, pvBuf, cb, off);
1325	if (RT_FAILURE(rc))
1326	return rc;
1327	}
1328
1329	uint32_t iRelocs = iDbgInfo + 1;
1330	if ( iRelocs >= pThis->Ehdr.e_shnum
1331	\|\| pThis->paShdrs[iRelocs].sh_info != iDbgInfo
1332	\|\| ( pThis->paShdrs[iRelocs].sh_type != SHT_REL
1333	&& pThis->paShdrs[iRelocs].sh_type != SHT_RELA) )
1334	{
1335	iRelocs = 0;
1336	while ( iRelocs < pThis->Ehdr.e_shnum
1337	&& ( pThis->paShdrs[iRelocs].sh_info != iDbgInfo
1338	\|\| ( pThis->paShdrs[iRelocs].sh_type != SHT_REL
1339	&& pThis->paShdrs[iRelocs].sh_type != SHT_RELA)) )
1340	iRelocs++;
1341	}
1342	if ( iRelocs < pThis->Ehdr.e_shnum
1343	&& pThis->paShdrs[iRelocs].sh_size > 0)
1344	{
1345	/*
1346	* Load the relocations.
1347	*/
1348	uint8_t *pbRelocsBuf = NULL;
1349	const uint8_t *pbRelocs;
1350	if (pThis->pvBits)
1351	pbRelocs = (const uint8_t *)pThis->pvBits + pThis->paShdrs[iRelocs].sh_offset;
1352	else
1353	{
1354	pbRelocs = pbRelocsBuf = (uint8_t *)RTMemTmpAlloc(pThis->paShdrs[iRelocs].sh_size);
1355	if (!pbRelocsBuf)
1356	return VERR_NO_TMP_MEMORY;
1357	rc = pThis->Core.pReader->pfnRead(pThis->Core.pReader, pbRelocsBuf,
1358	pThis->paShdrs[iRelocs].sh_size,
1359	pThis->paShdrs[iRelocs].sh_offset);
1360	if (RT_FAILURE(rc))
1361	{
1362	RTMemTmpFree(pbRelocsBuf);
1363	return rc;
1364	}
1365	}
1366
1367	/*
1368	* Apply the relocations.
1369	*/
1370	if (pThis->Ehdr.e_type == ET_REL)
1371	rc = RTLDRELF_NAME(RelocateSection)(pThis, pThis->LinkAddress,
1372	RTLDRELF_NAME(GetImportStubCallback), NULL /pvUser/,
1373	pThis->paShdrs[iDbgInfo].sh_addr,
1374	pThis->paShdrs[iDbgInfo].sh_size,
1375	(const uint8_t *)pvBuf,
1376	(uint8_t *)pvBuf,
1377	pbRelocs,
1378	pThis->paShdrs[iRelocs].sh_size);
1379	else
1380	rc = RTLDRELF_NAME(RelocateSectionExecDyn)(pThis, pThis->LinkAddress,
1381	RTLDRELF_NAME(GetImportStubCallback), NULL /pvUser/,
1382	pThis->paShdrs[iDbgInfo].sh_addr,
1383	pThis->paShdrs[iDbgInfo].sh_size,
1384	(const uint8_t *)pvBuf,
1385	(uint8_t *)pvBuf,
1386	pbRelocs,
1387	pThis->paShdrs[iRelocs].sh_size);
1388
1389	RTMemTmpFree(pbRelocsBuf);
1390	}
1391	else
1392	rc = VINF_SUCCESS;
1393	return rc;
1394	}
1395
1396
1397
1398	/**
1399	* The ELF module operations.
1400	*/
1401	static RTLDROPS RTLDRELF_MID(s_rtldrElf,Ops) =
1402	{
1403	#if ELF_MODE == 32
1404	"elf32",
1405	#elif ELF_MODE == 64
1406	"elf64",
1407	#endif
1408	RTLDRELF_NAME(Close),
1409	NULL, /* Get Symbol */
1410	RTLDRELF_NAME(Done),
1411	RTLDRELF_NAME(EnumSymbols),
1412	/* ext: */
1413	RTLDRELF_NAME(GetImageSize),
1414	RTLDRELF_NAME(GetBits),
1415	RTLDRELF_NAME(Relocate),
1416	RTLDRELF_NAME(GetSymbolEx),
1417	NULL /pfnQueryForwarderInfo/,
1418	RTLDRELF_NAME(EnumDbgInfo),
1419	RTLDRELF_NAME(EnumSegments),
1420	RTLDRELF_NAME(LinkAddressToSegOffset),
1421	RTLDRELF_NAME(LinkAddressToRva),
1422	RTLDRELF_NAME(SegOffsetToRva),
1423	RTLDRELF_NAME(RvaToSegOffset),
1424	RTLDRELF_NAME(ReadDbgInfo),
1425	NULL /pfnQueryProp/,
1426	NULL /pfnVerifySignature/,
1427	NULL /pfnHashImage/,
1428	42
1429	};
1430
1431
1432
1433	/**
1434	* Validates the ELF header.
1435	*
1436	* @returns iprt status code.
1437	* @param pEhdr Pointer to the ELF header.
1438	* @param pszLogName The log name.
1439	* @param cbRawImage The size of the raw image.
1440	*/
1441	static int RTLDRELF_NAME(ValidateElfHeader)(const Elf_Ehdr pEhdr, const char pszLogName, uint64_t cbRawImage,
1442	PRTLDRARCH penmArch)
1443	{
1444	Log3(("RTLdrELF: e_ident: %.*Rhxs\n"
1445	"RTLdrELF: e_type: " FMT_ELF_HALF "\n"
1446	"RTLdrELF: e_version: " FMT_ELF_HALF "\n"
1447	"RTLdrELF: e_entry: " FMT_ELF_ADDR "\n"
1448	"RTLdrELF: e_phoff: " FMT_ELF_OFF "\n"
1449	"RTLdrELF: e_shoff: " FMT_ELF_OFF "\n"
1450	"RTLdrELF: e_flags: " FMT_ELF_WORD "\n"
1451	"RTLdrELF: e_ehsize: " FMT_ELF_HALF "\n"
1452	"RTLdrELF: e_phentsize: " FMT_ELF_HALF "\n"
1453	"RTLdrELF: e_phnum: " FMT_ELF_HALF "\n"
1454	"RTLdrELF: e_shentsize: " FMT_ELF_HALF "\n"
1455	"RTLdrELF: e_shnum: " FMT_ELF_HALF "\n"
1456	"RTLdrELF: e_shstrndx: " FMT_ELF_HALF "\n",
1457	RT_ELEMENTS(pEhdr->e_ident), &pEhdr->e_ident[0], pEhdr->e_type, pEhdr->e_version,
1458	pEhdr->e_entry, pEhdr->e_phoff, pEhdr->e_shoff,pEhdr->e_flags, pEhdr->e_ehsize, pEhdr->e_phentsize,
1459	pEhdr->e_phnum, pEhdr->e_shentsize, pEhdr->e_shnum, pEhdr->e_shstrndx));
1460
1461	if ( pEhdr->e_ident[EI_MAG0] != ELFMAG0
1462	\|\| pEhdr->e_ident[EI_MAG1] != ELFMAG1
1463	\|\| pEhdr->e_ident[EI_MAG2] != ELFMAG2
1464	\|\| pEhdr->e_ident[EI_MAG3] != ELFMAG3
1465	)
1466	{
1467	Log(("RTLdrELF: %s: Invalid ELF magic (%.*Rhxs)\n", pszLogName, sizeof(pEhdr->e_ident), pEhdr->e_ident)); NOREF(pszLogName);
1468	return VERR_BAD_EXE_FORMAT;
1469	}
1470	if (pEhdr->e_ident[EI_CLASS] != RTLDRELF_SUFF(ELFCLASS))
1471	{
1472	Log(("RTLdrELF: %s: Invalid ELF class (%.*Rhxs)\n", pszLogName, sizeof(pEhdr->e_ident), pEhdr->e_ident));
1473	return VERR_BAD_EXE_FORMAT;
1474	}
1475	if (pEhdr->e_ident[EI_DATA] != ELFDATA2LSB)
1476	{
1477	Log(("RTLdrELF: %s: ELF endian %x is unsupported\n", pszLogName, pEhdr->e_ident[EI_DATA]));
1478	return VERR_LDRELF_ODD_ENDIAN;
1479	}
1480	if (pEhdr->e_version != EV_CURRENT)
1481	{
1482	Log(("RTLdrELF: %s: ELF version %x is unsupported\n", pszLogName, pEhdr->e_version));
1483	return VERR_LDRELF_VERSION;
1484	}
1485
1486	if (sizeof(Elf_Ehdr) != pEhdr->e_ehsize)
1487	{
1488	Log(("RTLdrELF: %s: Elf header e_ehsize is %d expected %d!\n",
1489	pszLogName, pEhdr->e_ehsize, sizeof(Elf_Ehdr)));
1490	return VERR_BAD_EXE_FORMAT;
1491	}
1492	if ( sizeof(Elf_Phdr) != pEhdr->e_phentsize
1493	&& ( pEhdr->e_phnum != 0
1494	\|\| pEhdr->e_type == ET_DYN))
1495	{
1496	Log(("RTLdrELF: %s: Elf header e_phentsize is %d expected %d!\n",
1497	pszLogName, pEhdr->e_phentsize, sizeof(Elf_Phdr)));
1498	return VERR_BAD_EXE_FORMAT;
1499	}
1500	if (sizeof(Elf_Shdr) != pEhdr->e_shentsize)
1501	{
1502	Log(("RTLdrELF: %s: Elf header e_shentsize is %d expected %d!\n",
1503	pszLogName, pEhdr->e_shentsize, sizeof(Elf_Shdr)));
1504	return VERR_BAD_EXE_FORMAT;
1505	}
1506
1507	switch (pEhdr->e_type)
1508	{
1509	case ET_REL:
1510	case ET_EXEC:
1511	case ET_DYN:
1512	break;
1513	default:
1514	Log(("RTLdrELF: %s: image type %#x is not supported!\n", pszLogName, pEhdr->e_type));
1515	return VERR_BAD_EXE_FORMAT;
1516	}
1517
1518	switch (pEhdr->e_machine)
1519	{
1520	#if ELF_MODE == 32
1521	case EM_386:
1522	case EM_486:
1523	*penmArch = RTLDRARCH_X86_32;
1524	break;
1525	#elif ELF_MODE == 64
1526	case EM_X86_64:
1527	*penmArch = RTLDRARCH_AMD64;
1528	break;
1529	#endif
1530	default:
1531	Log(("RTLdrELF: %s: machine type %u is not supported!\n", pszLogName, pEhdr->e_machine));
1532	return VERR_LDRELF_MACHINE;
1533	}
1534
1535	if ( pEhdr->e_phoff < pEhdr->e_ehsize
1536	&& !(pEhdr->e_phoff && pEhdr->e_phnum)
1537	&& pEhdr->e_phnum)
1538	{
1539	Log(("RTLdrELF: %s: The program headers overlap with the ELF header! e_phoff=" FMT_ELF_OFF "\n",
1540	pszLogName, pEhdr->e_phoff));
1541	return VERR_BAD_EXE_FORMAT;
1542	}
1543	if ( pEhdr->e_phoff + pEhdr->e_phnum * pEhdr->e_phentsize > cbRawImage
1544	\|\| pEhdr->e_phoff + pEhdr->e_phnum * pEhdr->e_phentsize < pEhdr->e_phoff)
1545	{
1546	Log(("RTLdrELF: %s: The program headers extends beyond the file! e_phoff=" FMT_ELF_OFF " e_phnum=" FMT_ELF_HALF "\n",
1547	pszLogName, pEhdr->e_phoff, pEhdr->e_phnum));
1548	return VERR_BAD_EXE_FORMAT;
1549	}
1550
1551
1552	if ( pEhdr->e_shoff < pEhdr->e_ehsize
1553	&& !(pEhdr->e_shoff && pEhdr->e_shnum))
1554	{
1555	Log(("RTLdrELF: %s: The section headers overlap with the ELF header! e_shoff=" FMT_ELF_OFF "\n",
1556	pszLogName, pEhdr->e_shoff));
1557	return VERR_BAD_EXE_FORMAT;
1558	}
1559	if ( pEhdr->e_shoff + pEhdr->e_shnum * pEhdr->e_shentsize > cbRawImage
1560	\|\| pEhdr->e_shoff + pEhdr->e_shnum * pEhdr->e_shentsize < pEhdr->e_shoff)
1561	{
1562	Log(("RTLdrELF: %s: The section headers extends beyond the file! e_shoff=" FMT_ELF_OFF " e_shnum=" FMT_ELF_HALF "\n",
1563	pszLogName, pEhdr->e_shoff, pEhdr->e_shnum));
1564	return VERR_BAD_EXE_FORMAT;
1565	}
1566
1567	if (pEhdr->e_shstrndx == 0 \|\| pEhdr->e_shstrndx > pEhdr->e_shnum)
1568	{
1569	Log(("RTLdrELF: %s: The section headers string table is out of bounds! e_shstrndx=" FMT_ELF_HALF " e_shnum=" FMT_ELF_HALF "\n",
1570	pszLogName, pEhdr->e_shstrndx, pEhdr->e_shnum));
1571	return VERR_BAD_EXE_FORMAT;
1572	}
1573
1574	return VINF_SUCCESS;
1575	}
1576
1577	/**
1578	* Gets the section header name.
1579	*
1580	* @returns pszName.
1581	* @param pEhdr The elf header.
1582	* @param offName The offset of the section header name.
1583	* @param pszName Where to store the name.
1584	* @param cbName The size of the buffer pointed to by pszName.
1585	*/
1586	const char RTLDRELF_NAME(GetSHdrName)(PRTLDRMODELF pModElf, Elf_Word offName, char pszName, size_t cbName)
1587	{
1588	RTFOFF off = pModElf->paShdrs[pModElf->Ehdr.e_shstrndx].sh_offset + offName;
1589	int rc = pModElf->Core.pReader->pfnRead(pModElf->Core.pReader, pszName, cbName - 1, off);
1590	if (RT_FAILURE(rc))
1591	{
1592	/* read by for byte. */
1593	for (unsigned i = 0; i < cbName; i++, off++)
1594	{
1595	rc = pModElf->Core.pReader->pfnRead(pModElf->Core.pReader, pszName + i, 1, off);
1596	if (RT_FAILURE(rc))
1597	{
1598	pszName[i] = '\0';
1599	break;
1600	}
1601	}
1602	}
1603
1604	pszName[cbName - 1] = '\0';
1605	return pszName;
1606	}
1607
1608
1609	/**
1610	* Validates a section header.
1611	*
1612	* @returns iprt status code.
1613	* @param pModElf Pointer to the module structure.
1614	* @param iShdr The index of section header which should be validated.
1615	* The section headers are found in the pModElf->paShdrs array.
1616	* @param pszLogName The log name.
1617	* @param cbRawImage The size of the raw image.
1618	*/
1619	static int RTLDRELF_NAME(ValidateSectionHeader)(PRTLDRMODELF pModElf, unsigned iShdr, const char *pszLogName, RTFOFF cbRawImage)
1620	{
1621	const Elf_Shdr *pShdr = &pModElf->paShdrs[iShdr];
1622	char szSectionName[80]; NOREF(szSectionName);
1623	Log3(("RTLdrELF: Section Header #%d:\n"
1624	"RTLdrELF: sh_name: " FMT_ELF_WORD " - %s\n"
1625	"RTLdrELF: sh_type: " FMT_ELF_WORD " (%s)\n"
1626	"RTLdrELF: sh_flags: " FMT_ELF_XWORD "\n"
1627	"RTLdrELF: sh_addr: " FMT_ELF_ADDR "\n"
1628	"RTLdrELF: sh_offset: " FMT_ELF_OFF "\n"
1629	"RTLdrELF: sh_size: " FMT_ELF_XWORD "\n"
1630	"RTLdrELF: sh_link: " FMT_ELF_WORD "\n"
1631	"RTLdrELF: sh_info: " FMT_ELF_WORD "\n"
1632	"RTLdrELF: sh_addralign: " FMT_ELF_XWORD "\n"
1633	"RTLdrELF: sh_entsize: " FMT_ELF_XWORD "\n",
1634	iShdr,
1635	pShdr->sh_name, RTLDRELF_NAME(GetSHdrName)(pModElf, pShdr->sh_name, szSectionName, sizeof(szSectionName)),
1636	pShdr->sh_type, rtldrElfGetShdrType(pShdr->sh_type), pShdr->sh_flags, pShdr->sh_addr,
1637	pShdr->sh_offset, pShdr->sh_size, pShdr->sh_link, pShdr->sh_info, pShdr->sh_addralign,
1638	pShdr->sh_entsize));
1639
1640	if (iShdr == 0)
1641	{
1642	if ( pShdr->sh_name != 0
1643	\|\| pShdr->sh_type != SHT_NULL
1644	\|\| pShdr->sh_flags != 0
1645	\|\| pShdr->sh_addr != 0
1646	\|\| pShdr->sh_size != 0
1647	\|\| pShdr->sh_offset != 0
1648	\|\| pShdr->sh_link != SHN_UNDEF
1649	\|\| pShdr->sh_addralign != 0
1650	\|\| pShdr->sh_entsize != 0 )
1651	{
1652	Log(("RTLdrELF: %s: Bad #0 section: %.Rhxs\n", pszLogName, sizeof(pShdr), pShdr ));
1653	return VERR_BAD_EXE_FORMAT;
1654	}
1655	return VINF_SUCCESS;
1656	}
1657
1658	if (pShdr->sh_name >= pModElf->cbShStr)
1659	{
1660	Log(("RTLdrELF: %s: Shdr #%d: sh_name (%d) is beyond the end of the section header string table (%d)!\n",
1661	pszLogName, iShdr, pShdr->sh_name, pModElf->cbShStr)); NOREF(pszLogName);
1662	return VERR_BAD_EXE_FORMAT;
1663	}
1664
1665	if (pShdr->sh_link >= pModElf->Ehdr.e_shnum)
1666	{
1667	Log(("RTLdrELF: %s: Shdr #%d: sh_link (%d) is beyond the end of the section table (%d)!\n",
1668	pszLogName, iShdr, pShdr->sh_link, pModElf->Ehdr.e_shnum)); NOREF(pszLogName);
1669	return VERR_BAD_EXE_FORMAT;
1670	}
1671
1672	switch (pShdr->sh_type)
1673	{
1674	/** @todo find specs and check up which sh_info fields indicates section table entries */
1675	case 12301230:
1676	if (pShdr->sh_info >= pModElf->Ehdr.e_shnum)
1677	{
1678	Log(("RTLdrELF: %s: Shdr #%d: sh_info (%d) is beyond the end of the section table (%d)!\n",
1679	pszLogName, iShdr, pShdr->sh_link, pModElf->Ehdr.e_shnum));
1680	return VERR_BAD_EXE_FORMAT;
1681	}
1682	break;
1683
1684	case SHT_NULL:
1685	break;
1686	case SHT_PROGBITS:
1687	case SHT_SYMTAB:
1688	case SHT_STRTAB:
1689	case SHT_RELA:
1690	case SHT_HASH:
1691	case SHT_DYNAMIC:
1692	case SHT_NOTE:
1693	case SHT_NOBITS:
1694	case SHT_REL:
1695	case SHT_SHLIB:
1696	case SHT_DYNSYM:
1697	/*
1698	* For these types sh_info doesn't have any special meaning, or anything which
1699	* we need/can validate now.
1700	*/
1701	break;
1702
1703
1704	default:
1705	Log(("RTLdrELF: %s: Warning, unknown type %d!\n", pszLogName, pShdr->sh_type));
1706	break;
1707	}
1708
1709	if ( pShdr->sh_type != SHT_NOBITS
1710	&& pShdr->sh_size)
1711	{
1712	RTFOFF offEnd = pShdr->sh_offset + pShdr->sh_size;
1713	if ( offEnd > cbRawImage
1714	\|\| offEnd < (RTFOFF)pShdr->sh_offset)
1715	{
1716	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",
1717	pszLogName, iShdr, pShdr->sh_offset, pShdr->sh_size, offEnd, cbRawImage));
1718	return VERR_BAD_EXE_FORMAT;
1719	}
1720	if (pShdr->sh_offset < sizeof(Elf_Ehdr))
1721	{
1722	Log(("RTLdrELF: %s: Shdr #%d: sh_offset (" FMT_ELF_OFF ") + sh_size (" FMT_ELF_XWORD ") is starting in the ELF header!\n",
1723	pszLogName, iShdr, pShdr->sh_offset, pShdr->sh_size));
1724	return VERR_BAD_EXE_FORMAT;
1725	}
1726	}
1727
1728	return VINF_SUCCESS;
1729	}
1730
1731
1732
1733	/**
1734	* Opens an ELF image, fixed bitness.
1735	*
1736	* @returns iprt status code.
1737	* @param pReader The loader reader instance which will provide the raw image bits.
1738	* @param fFlags Reserved, MBZ.
1739	* @param enmArch Architecture specifier.
1740	* @param phLdrMod Where to store the handle.
1741	*/
1742	static int RTLDRELF_NAME(Open)(PRTLDRREADER pReader, uint32_t fFlags, RTLDRARCH enmArch, PRTLDRMOD phLdrMod)
1743	{
1744	const char *pszLogName = pReader->pfnLogName(pReader);
1745	RTFOFF cbRawImage = pReader->pfnSize(pReader);
1746
1747	/*
1748	* Create the loader module instance.
1749	*/
1750	PRTLDRMODELF pModElf = (PRTLDRMODELF)RTMemAllocZ(sizeof(*pModElf));
1751	if (!pModElf)
1752	return VERR_NO_MEMORY;
1753
1754	pModElf->Core.u32Magic = RTLDRMOD_MAGIC;
1755	pModElf->Core.eState = LDR_STATE_INVALID;
1756	pModElf->Core.pReader = pReader;
1757	pModElf->Core.enmFormat = RTLDRFMT_ELF;
1758	pModElf->Core.enmType = RTLDRTYPE_OBJECT;
1759	pModElf->Core.enmEndian = RTLDRENDIAN_LITTLE;
1760	#if ELF_MODE == 32
1761	pModElf->Core.enmArch = RTLDRARCH_X86_32;
1762	#else
1763	pModElf->Core.enmArch = RTLDRARCH_AMD64;
1764	#endif
1765	//pModElf->pvBits = NULL;
1766	//pModElf->Ehdr = {0};
1767	//pModElf->paShdrs = NULL;
1768	//pModElf->paSyms = NULL;
1769	pModElf->iSymSh = ~0U;
1770	//pModElf->cSyms = 0;
1771	pModElf->iStrSh = ~0U;
1772	//pModElf->cbStr = 0;
1773	//pModElf->cbImage = 0;
1774	//pModElf->LinkAddress = 0;
1775	//pModElf->pStr = NULL;
1776	//pModElf->cbShStr = 0;
1777	//pModElf->pShStr = NULL;
1778
1779	/*
1780	* Read and validate the ELF header and match up the CPU architecture.
1781	*/
1782	int rc = pReader->pfnRead(pReader, &pModElf->Ehdr, sizeof(pModElf->Ehdr), 0);
1783	if (RT_SUCCESS(rc))
1784	{
1785	RTLDRARCH enmArchImage = RTLDRARCH_INVALID; /* shut up gcc */
1786	rc = RTLDRELF_NAME(ValidateElfHeader)(&pModElf->Ehdr, pszLogName, cbRawImage, &enmArchImage);
1787	if (RT_SUCCESS(rc))
1788	{
1789	if ( enmArch != RTLDRARCH_WHATEVER
1790	&& enmArch != enmArchImage)
1791	rc = VERR_LDR_ARCH_MISMATCH;
1792	}
1793	}
1794	if (RT_SUCCESS(rc))
1795	{
1796	/*
1797	* Read the section headers, keeping a prestine copy for the module
1798	* introspection methods.
1799	*/
1800	size_t const cbShdrs = pModElf->Ehdr.e_shnum * sizeof(Elf_Shdr);
1801	Elf_Shdr paShdrs = (Elf_Shdr )RTMemAlloc(cbShdrs * 2);
1802	if (paShdrs)
1803	{
1804	pModElf->paShdrs = paShdrs;
1805	rc = pReader->pfnRead(pReader, paShdrs, cbShdrs, pModElf->Ehdr.e_shoff);
1806	if (RT_SUCCESS(rc))
1807	{
1808	memcpy(&paShdrs[pModElf->Ehdr.e_shnum], paShdrs, cbShdrs);
1809	pModElf->paOrgShdrs = &paShdrs[pModElf->Ehdr.e_shnum];
1810
1811	pModElf->cbShStr = paShdrs[pModElf->Ehdr.e_shstrndx].sh_size;
1812
1813	/*
1814	* Validate the section headers and find relevant sections.
1815	*/
1816	Elf_Addr uNextAddr = 0;
1817	for (unsigned i = 0; i < pModElf->Ehdr.e_shnum; i++)
1818	{
1819	rc = RTLDRELF_NAME(ValidateSectionHeader)(pModElf, i, pszLogName, cbRawImage);
1820	if (RT_FAILURE(rc))
1821	break;
1822
1823	/* We're looking for symbol tables. */
1824	if (paShdrs[i].sh_type == SHT_SYMTAB)
1825	{
1826	if (pModElf->iSymSh != ~0U)
1827	{
1828	Log(("RTLdrElf: %s: Multiple symbol tabs! iSymSh=%d i=%d\n", pszLogName, pModElf->iSymSh, i));
1829	rc = VERR_LDRELF_MULTIPLE_SYMTABS;
1830	break;
1831	}
1832	pModElf->iSymSh = i;
1833	pModElf->cSyms = (unsigned)(paShdrs[i].sh_size / sizeof(Elf_Sym));
1834	AssertReturn(pModElf->cSyms == paShdrs[i].sh_size / sizeof(Elf_Sym), VERR_IMAGE_TOO_BIG);
1835	pModElf->iStrSh = paShdrs[i].sh_link;
1836	pModElf->cbStr = (unsigned)paShdrs[pModElf->iStrSh].sh_size;
1837	AssertReturn(pModElf->cbStr == paShdrs[pModElf->iStrSh].sh_size, VERR_IMAGE_TOO_BIG);
1838	}
1839
1840	/* Special checks for the section string table. */
1841	if (i == pModElf->Ehdr.e_shstrndx)
1842	{
1843	if (paShdrs[i].sh_type != SHT_STRTAB)
1844	{
1845	Log(("RTLdrElf: Section header string table is not a SHT_STRTAB: %#x\n", paShdrs[i].sh_type));
1846	rc = VERR_BAD_EXE_FORMAT;
1847	break;
1848	}
1849	if (paShdrs[i].sh_size == 0)
1850	{
1851	Log(("RTLdrElf: Section header string table is empty\n"));
1852	rc = VERR_BAD_EXE_FORMAT;
1853	break;
1854	}
1855	}
1856
1857	/* Kluge for the .data..percpu segment in 64-bit linux kernels. */
1858	if (paShdrs[i].sh_flags & SHF_ALLOC)
1859	{
1860	if ( paShdrs[i].sh_addr == 0
1861	&& paShdrs[i].sh_addr < uNextAddr)
1862	{
1863	Elf_Addr uAddr = RT_ALIGN_T(uNextAddr, paShdrs[i].sh_addralign, Elf_Addr);
1864	Log(("RTLdrElf: Out of order section #%d; adjusting sh_addr from " FMT_ELF_ADDR " to " FMT_ELF_ADDR "\n",
1865	i, paShdrs[i].sh_addr, uAddr));
1866	paShdrs[i].sh_addr = uAddr;
1867	}
1868	uNextAddr = paShdrs[i].sh_addr + paShdrs[i].sh_size;
1869	}
1870	} /* for each section header */
1871
1872	/*
1873	* Calculate the image base address if the image isn't relocatable.
1874	*/
1875	if (RT_SUCCESS(rc) && pModElf->Ehdr.e_type != ET_REL)
1876	{
1877	pModElf->LinkAddress = ~(Elf_Addr)0;
1878	for (unsigned i = 0; i < pModElf->Ehdr.e_shnum; i++)
1879	if ( (paShdrs[i].sh_flags & SHF_ALLOC)
1880	&& paShdrs[i].sh_addr < pModElf->LinkAddress)
1881	pModElf->LinkAddress = paShdrs[i].sh_addr;
1882	if (pModElf->LinkAddress == ~(Elf_Addr)0)
1883	{
1884	AssertFailed();
1885	rc = VERR_LDR_GENERAL_FAILURE;
1886	}
1887	}
1888
1889	/*
1890	* Perform allocations / RVA calculations, determine the image size.
1891	*/
1892	if (RT_SUCCESS(rc))
1893	for (unsigned i = 0; i < pModElf->Ehdr.e_shnum; i++)
1894	if (paShdrs[i].sh_flags & SHF_ALLOC)
1895	{
1896	if (pModElf->Ehdr.e_type == ET_REL)
1897	paShdrs[i].sh_addr = paShdrs[i].sh_addralign
1898	? RT_ALIGN_T(pModElf->cbImage, paShdrs[i].sh_addralign, Elf_Addr)
1899	: (Elf_Addr)pModElf->cbImage;
1900	else
1901	paShdrs[i].sh_addr -= pModElf->LinkAddress;
1902	Elf_Addr EndAddr = paShdrs[i].sh_addr + paShdrs[i].sh_size;
1903	if (pModElf->cbImage < EndAddr)
1904	{
1905	pModElf->cbImage = (size_t)EndAddr;
1906	AssertMsgReturn(pModElf->cbImage == EndAddr, (FMT_ELF_ADDR "\n", EndAddr), VERR_IMAGE_TOO_BIG);
1907	}
1908	Log2(("RTLdrElf: %s: Assigned " FMT_ELF_ADDR " to section #%d\n", pszLogName, paShdrs[i].sh_addr, i));
1909	}
1910
1911	Log2(("RTLdrElf: iSymSh=%u cSyms=%u iStrSh=%u cbStr=%u rc=%Rrc cbImage=%#zx LinkAddress=" FMT_ELF_ADDR "\n",
1912	pModElf->iSymSh, pModElf->cSyms, pModElf->iStrSh, pModElf->cbStr, rc,
1913	pModElf->cbImage, pModElf->LinkAddress));
1914	if (RT_SUCCESS(rc))
1915	{
1916	pModElf->Core.pOps = &RTLDRELF_MID(s_rtldrElf,Ops);
1917	pModElf->Core.eState = LDR_STATE_OPENED;
1918	*phLdrMod = &pModElf->Core;
1919
1920	LogFlow(("%s: %s: returns VINF_SUCCESS phLdrMod=%p\n", __FUNCTION__, pszLogName, phLdrMod));
1921	return VINF_SUCCESS;
1922	}
1923	}
1924
1925	RTMemFree(paShdrs);
1926	}
1927	else
1928	rc = VERR_NO_MEMORY;
1929	}
1930
1931	RTMemFree(pModElf);
1932	LogFlow(("%s: returns %Rrc\n", __FUNCTION__, rc));
1933	return rc;
1934	}
1935
1936
1937
1938
1939	/*******************************************************************************
1940	* Cleanup Constants And Macros *
1941	*******************************************************************************/
1942	#undef RTLDRELF_NAME
1943	#undef RTLDRELF_SUFF
1944	#undef RTLDRELF_MID
1945
1946	#undef FMT_ELF_ADDR
1947	#undef FMT_ELF_HALF
1948	#undef FMT_ELF_SHALF
1949	#undef FMT_ELF_OFF
1950	#undef FMT_ELF_SIZE
1951	#undef FMT_ELF_SWORD
1952	#undef FMT_ELF_WORD
1953	#undef FMT_ELF_XWORD
1954	#undef FMT_ELF_SXWORD
1955
1956	#undef Elf_Ehdr
1957	#undef Elf_Phdr
1958	#undef Elf_Shdr
1959	#undef Elf_Sym
1960	#undef Elf_Rel
1961	#undef Elf_Rela
1962	#undef Elf_Reloc
1963	#undef Elf_Nhdr
1964	#undef Elf_Dyn
1965
1966	#undef Elf_Addr
1967	#undef Elf_Half
1968	#undef Elf_Off
1969	#undef Elf_Size
1970	#undef Elf_Sword
1971	#undef Elf_Word
1972
1973	#undef RTLDRMODELF
1974	#undef PRTLDRMODELF
1975
1976	#undef ELF_R_SYM
1977	#undef ELF_R_TYPE
1978	#undef ELF_R_INFO
1979
1980	#undef ELF_ST_BIND
1981

Note: See TracBrowser for help on using the repository browser.

source: vbox/trunk/src/VBox/Runtime/common/ldr/ldrELFRelocatable.cpp.h@ 56978

Download in other formats: