ldrELFRelocatable.cpp.h@ 38515

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1	/* $Id: ldrELFRelocatable.cpp.h 38515 2011-08-24 14:33:32Z vboxsync $ */
2	/** @file
3	* IPRT - Binary Image Loader, Template for ELF Relocatable Images.
4	*/
5
6	/*
7	* Copyright (C) 2006-2007 Oracle Corporation
8	*
9	* This file is part of VirtualBox Open Source Edition (OSE), as
10	* available from http://www.215389.xyz. 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 the reader instance. */
96	PRTLDRREADER pReader;
97	/** Pointer to readonly mapping of the image bits.
98	* This mapping is provided by the pReader. */
99	const void *pvBits;
100
101	/** The ELF header. */
102	Elf_Ehdr Ehdr;
103	/** Pointer to our copy of the section headers.
104	* The virtual addresses in this array is the 0 based assignments we've given the image.
105	* Not valid if the image is DONE. */
106	Elf_Shdr *paShdrs;
107	/** The size of the loaded image. */
108	size_t cbImage;
109
110	/** The symbol section index. */
111	unsigned iSymSh;
112	/** Number of symbols in the table. */
113	unsigned cSyms;
114	/** Pointer to symbol table within RTLDRMODELF::pvBits. */
115	const Elf_Sym *paSyms;
116
117	/** The string section index. */
118	unsigned iStrSh;
119	/** Size of the string table. */
120	unsigned cbStr;
121	/** Pointer to string table within RTLDRMODELF::pvBits. */
122	const char *pStr;
123	} RTLDRMODELF, *PRTLDRMODELF;
124
125
126	/**
127	* Maps the image bits into memory and resolve pointers into it.
128	*
129	* @returns iprt status code.
130	* @param pModElf The ELF loader module instance data.
131	* @param fNeedsBits Set if we actually need the pvBits member.
132	* If we don't, we can simply read the string and symbol sections, thus saving memory.
133	*/
134	static int RTLDRELF_NAME(MapBits)(PRTLDRMODELF pModElf, bool fNeedsBits)
135	{
136	NOREF(fNeedsBits);
137	if (pModElf->pvBits)
138	return VINF_SUCCESS;
139	int rc = pModElf->pReader->pfnMap(pModElf->pReader, &pModElf->pvBits);
140	if (RT_SUCCESS(rc))
141	{
142	const uint8_t pu8 = (const uint8_t )pModElf->pvBits;
143	pModElf->paSyms = (const Elf_Sym *)(pu8 + pModElf->paShdrs[pModElf->iSymSh].sh_offset);
144	pModElf->pStr = (const char *)(pu8 + pModElf->paShdrs[pModElf->iStrSh].sh_offset);
145	}
146	return rc;
147	}
148
149
150	/**
151	* Get the symbol and symbol value.
152	*
153	* @returns iprt status code.
154	* @param pModElf The ELF loader module instance data.
155	* @param BaseAddr The base address which the module is being fixedup to.
156	* @param pfnGetImport The callback function to use to resolve imports (aka unresolved externals).
157	* @param pvUser User argument to pass to the callback.
158	* @param iSym The symbol to get.
159	* @param ppSym Where to store the symbol pointer on success. (read only)
160	* @param pSymValue Where to store the symbol value on success.
161	*/
162	static int RTLDRELF_NAME(Symbol)(PRTLDRMODELF pModElf, Elf_Addr BaseAddr, PFNRTLDRIMPORT pfnGetImport, void *pvUser,
163	Elf_Size iSym, const Elf_Sym *ppSym, Elf_Addr pSymValue)
164	{
165	/*
166	* Validate and find the symbol.
167	*/
168	if (iSym >= pModElf->cSyms)
169	{
170	AssertMsgFailed(("iSym=%d is an invalid symbol index!\n", iSym));
171	return VERR_LDRELF_INVALID_SYMBOL_INDEX;
172	}
173	const Elf_Sym *pSym = &pModElf->paSyms[iSym];
174	*ppSym = pSym;
175
176	if (pSym->st_name >= pModElf->cbStr)
177	{
178	AssertMsgFailed(("iSym=%d st_name=%d str sh_size=%d\n", iSym, pSym->st_name, pModElf->cbStr));
179	return VERR_LDRELF_INVALID_SYMBOL_NAME_OFFSET;
180	}
181	const char *pszName = ELF_STR(pModElf, pSym->st_name);
182
183	/*
184	* Determine the symbol value.
185	*
186	* Symbols needs different treatment depending on which section their are in.
187	* Undefined and absolute symbols goes into special non-existing sections.
188	*/
189	switch (pSym->st_shndx)
190	{
191	/*
192	* Undefined symbol, needs resolving.
193	*
194	* Since ELF has no generic concept of importing from specific module (the OS/2 ELF format
195	* has but that's a OS extension and only applies to programs and dlls), we'll have to ask
196	* the resolver callback to do a global search.
197	*/
198	case SHN_UNDEF:
199	{
200	/* Try to resolve the symbol. */
201	RTUINTPTR Value;
202	int rc = pfnGetImport(&pModElf->Core, "", pszName, ~0, &Value, pvUser);
203	if (RT_FAILURE(rc))
204	{
205	AssertMsgFailed(("Failed to resolve '%s' rc=%Rrc\n", pszName, rc));
206	return rc;
207	}
208	*pSymValue = (Elf_Addr)Value;
209	if ((RTUINTPTR)*pSymValue != Value)
210	{
211	AssertMsgFailed(("Symbol value overflowed! '%s'\n", pszName));
212	return VERR_SYMBOL_VALUE_TOO_BIG;
213	}
214
215	Log2(("rtldrELF: #%-3d - UNDEF " FMT_ELF_ADDR " '%s'\n", iSym, *pSymValue, pszName));
216	break;
217	}
218
219	/*
220	* Absolute symbols needs no fixing since they are, well, absolute.
221	*/
222	case SHN_ABS:
223	*pSymValue = pSym->st_value;
224	Log2(("rtldrELF: #%-3d - ABS " FMT_ELF_ADDR " '%s'\n", iSym, *pSymValue, pszName));
225	break;
226
227	/*
228	* All other symbols are addressed relative to their section and need to be fixed up.
229	*/
230	default:
231	if (pSym->st_shndx >= pModElf->Ehdr.e_shnum)
232	{
233	/* what about common symbols? */
234	AssertMsg(pSym->st_shndx < pModElf->Ehdr.e_shnum,
235	("iSym=%d st_shndx=%d e_shnum=%d pszName=%s\n", iSym, pSym->st_shndx, pModElf->Ehdr.e_shnum, pszName));
236	return VERR_BAD_EXE_FORMAT;
237	}
238	*pSymValue = pSym->st_value + pModElf->paShdrs[pSym->st_shndx].sh_addr + BaseAddr;
239	Log2(("rtldrELF: #%-3d - %5d " FMT_ELF_ADDR " '%s'\n", iSym, pSym->st_shndx, *pSymValue, pszName));
240	break;
241	}
242
243	return VINF_SUCCESS;
244	}
245
246
247	/**
248	* Applies the fixups for a sections.
249	*
250	* @returns iprt status code.
251	* @param pModElf The ELF loader module instance data.
252	* @param BaseAddr The base address which the module is being fixedup to.
253	* @param pfnGetImport The callback function to use to resolve imports (aka unresolved externals).
254	* @param pvUser User argument to pass to the callback.
255	* @param SecAddr The section address. This is the address the relocations are relative to.
256	* @param cbSec The section size. The relocations must be inside this.
257	* @param pu8SecBaseR Where we read section bits from.
258	* @param pu8SecBaseW Where we write section bits to.
259	* @param pvRelocs Pointer to where we read the relocations from.
260	* @param cbRelocs Size of the relocations.
261	*/
262	static int RTLDRELF_NAME(RelocateSection)(PRTLDRMODELF pModElf, Elf_Addr BaseAddr, PFNRTLDRIMPORT pfnGetImport, void *pvUser,
263	const Elf_Addr SecAddr, Elf_Size cbSec, const uint8_t pu8SecBaseR, uint8_t pu8SecBaseW,
264	const void *pvRelocs, Elf_Size cbRelocs)
265	{
266	/*
267	* Iterate the relocations.
268	* The relocations are stored in an array of Elf32_Rel records and covers the entire relocation section.
269	*/
270	const Elf_Reloc paRels = (const Elf_Reloc )pvRelocs;
271	const unsigned iRelMax = (unsigned)(cbRelocs / sizeof(paRels[0]));
272	AssertMsgReturn(iRelMax == cbRelocs / sizeof(paRels[0]), (FMT_ELF_SIZE "\n", cbRelocs / sizeof(paRels[0])), VERR_IMAGE_TOO_BIG);
273	for (unsigned iRel = 0; iRel < iRelMax; iRel++)
274	{
275	/*
276	* Get the symbol.
277	*/
278	const Elf_Sym *pSym;
279	Elf_Addr SymValue = 0; /* shut up gcc-4 */
280	int rc = RTLDRELF_NAME(Symbol)(pModElf, BaseAddr, pfnGetImport, pvUser, ELF_R_SYM(paRels[iRel].r_info), &pSym, &SymValue);
281	if (RT_FAILURE(rc))
282	return rc;
283
284	Log3(("rtldrELF: " FMT_ELF_ADDR " %02x %06x - " FMT_ELF_ADDR " %3d %02x %s\n",
285	paRels[iRel].r_offset, ELF_R_TYPE(paRels[iRel].r_info), (unsigned)ELF_R_SYM(paRels[iRel].r_info),
286	SymValue, (unsigned)pSym->st_shndx, pSym->st_info, ELF_STR(pModElf, pSym->st_name)));
287
288	/*
289	* Apply the fixup.
290	*/
291	AssertMsgReturn(paRels[iRel].r_offset < cbSec, (FMT_ELF_ADDR " " FMT_ELF_SIZE "\n", paRels[iRel].r_offset, cbSec), VERR_LDRELF_INVALID_RELOCATION_OFFSET);
292	#if ELF_MODE == 32
293	const Elf_Addr pAddrR = (const Elf_Addr )(pu8SecBaseR + paRels[iRel].r_offset); /* Where to read the addend. */
294	#endif
295	Elf_Addr pAddrW = (Elf_Addr )(pu8SecBaseW + paRels[iRel].r_offset); /* Where to write the fixup. */
296	switch (ELF_R_TYPE(paRels[iRel].r_info))
297	{
298	#if ELF_MODE == 32
299	/*
300	* Absolute addressing.
301	*/
302	case R_386_32:
303	{
304	const Elf_Addr Value = SymValue + *pAddrR;
305	(uint32_t )pAddrW = Value;
306	Log4((FMT_ELF_ADDR": R_386_32 Value=" FMT_ELF_ADDR " SymValue=" FMT_ELF_ADDR "\n",
307	SecAddr + paRels[iRel].r_offset + BaseAddr, Value, SymValue));
308	break;
309	}
310
311	/*
312	* PC relative addressing.
313	*/
314	case R_386_PC32:
315	{
316	const Elf_Addr SourceAddr = SecAddr + paRels[iRel].r_offset + BaseAddr; /* Where the source really is. */
317	const Elf_Addr Value = SymValue + (uint32_t )pAddrR - SourceAddr;
318	(uint32_t )pAddrW = Value;
319	Log4((FMT_ELF_ADDR": R_386_PC32 Value=" FMT_ELF_ADDR " SymValue=" FMT_ELF_ADDR "\n",
320	SourceAddr, Value, SymValue));
321	break;
322	}
323
324	/* ignore */
325	case R_386_NONE:
326	break;
327
328	#elif ELF_MODE == 64
329
330	/*
331	* Absolute addressing
332	*/
333	case R_X86_64_64:
334	{
335	const Elf_Addr Value = SymValue + paRels[iRel].r_addend;
336	(uint64_t )pAddrW = Value;
337	Log4((FMT_ELF_ADDR": R_X86_64_64 Value=" FMT_ELF_ADDR " SymValue=" FMT_ELF_ADDR "\n",
338	SecAddr + paRels[iRel].r_offset + BaseAddr, Value, SymValue));
339	break;
340	}
341
342	/*
343	* Truncated 32-bit value (zero-extendedable to the 64-bit value).
344	*/
345	case R_X86_64_32:
346	{
347	const Elf_Addr Value = SymValue + paRels[iRel].r_addend;
348	(uint32_t )pAddrW = (uint32_t)Value;
349	Log4((FMT_ELF_ADDR": R_X86_64_32 Value=" FMT_ELF_ADDR " SymValue=" FMT_ELF_ADDR "\n",
350	SecAddr + paRels[iRel].r_offset + BaseAddr, Value, SymValue));
351	AssertMsgReturn((Elf_Addr)(uint32_t )pAddrW == Value, ("Value=" FMT_ELF_ADDR "\n", Value), VERR_SYMBOL_VALUE_TOO_BIG);
352	break;
353	}
354
355	/*
356	* Truncated 32-bit value (sign-extendedable to the 64-bit value).
357	*/
358	case R_X86_64_32S:
359	{
360	const Elf_Addr Value = SymValue + paRels[iRel].r_addend;
361	(int32_t )pAddrW = (int32_t)Value;
362	Log4((FMT_ELF_ADDR": R_X86_64_32S Value=" FMT_ELF_ADDR " SymValue=" FMT_ELF_ADDR "\n",
363	SecAddr + paRels[iRel].r_offset + BaseAddr, Value, SymValue));
364	AssertMsgReturn((Elf_Addr)(int32_t )pAddrW == Value, ("Value=" FMT_ELF_ADDR "\n", Value), VERR_SYMBOL_VALUE_TOO_BIG); /** @todo check the sign-extending here. */
365	break;
366	}
367
368	/*
369	* PC relative addressing.
370	*/
371	case R_X86_64_PC32:
372	{
373	const Elf_Addr SourceAddr = SecAddr + paRels[iRel].r_offset + BaseAddr; /* Where the source really is. */
374	const Elf_Addr Value = SymValue + paRels[iRel].r_addend - SourceAddr;
375	(int32_t )pAddrW = (int32_t)Value;
376	Log4((FMT_ELF_ADDR": R_X86_64_PC32 Value=" FMT_ELF_ADDR " SymValue=" FMT_ELF_ADDR "\n",
377	SourceAddr, Value, SymValue));
378	AssertMsgReturn((Elf_Addr)(int32_t )pAddrW == Value, ("Value=" FMT_ELF_ADDR "\n", Value), VERR_SYMBOL_VALUE_TOO_BIG); /** @todo check the sign-extending here. */
379	break;
380	}
381
382	/* ignore */
383	case R_X86_64_NONE:
384	break;
385	#endif
386
387	default:
388	AssertMsgFailed(("Unknown relocation type: %d (iRel=%d iRelMax=%d)\n",
389	ELF_R_TYPE(paRels[iRel].r_info), iRel, iRelMax));
390	return VERR_LDRELF_RELOCATION_NOT_SUPPORTED;
391	}
392	}
393
394	return VINF_SUCCESS;
395	}
396
397
398
399	/** @copydoc RTLDROPS::pfnClose */
400	static DECLCALLBACK(int) RTLDRELF_NAME(Close)(PRTLDRMODINTERNAL pMod)
401	{
402	PRTLDRMODELF pModElf = (PRTLDRMODELF)pMod;
403
404	if (pModElf->paShdrs)
405	{
406	RTMemFree(pModElf->paShdrs);
407	pModElf->paShdrs = NULL;
408	}
409
410	if (pModElf->pReader)
411	{
412	pModElf->pReader->pfnDestroy(pModElf->pReader);
413	pModElf->pReader = NULL;
414	}
415
416	pModElf->pvBits = NULL;
417
418	return VINF_SUCCESS;
419	}
420
421
422	/** @copydoc RTLDROPS::Done */
423	static DECLCALLBACK(int) RTLDRELF_NAME(Done)(PRTLDRMODINTERNAL pMod)
424	{
425	//PRTLDRMODELF pModElf = (PRTLDRMODELF)pMod;
426	/** @todo Have to think more about this .... */
427	return -1;
428	}
429
430
431	/** @copydoc RTLDROPS::EnumSymbols */
432	static DECLCALLBACK(int) RTLDRELF_NAME(EnumSymbols)(PRTLDRMODINTERNAL pMod, unsigned fFlags, const void *pvBits, RTUINTPTR BaseAddress,
433	PFNRTLDRENUMSYMS pfnCallback, void *pvUser)
434	{
435	PRTLDRMODELF pModElf = (PRTLDRMODELF)pMod;
436
437	/*
438	* Validate the input.
439	*/
440	Elf_Addr BaseAddr = (Elf_Addr)BaseAddress;
441	AssertMsgReturn((RTUINTPTR)BaseAddr == BaseAddress, ("#RTptr", BaseAddress), VERR_IMAGE_BASE_TOO_HIGH);
442
443	/*
444	* Make sure we've got the string and symbol tables. (We don't need the pvBits.)
445	*/
446	int rc = RTLDRELF_NAME(MapBits)(pModElf, false);
447	if (RT_FAILURE(rc))
448	return rc;
449
450	/*
451	* Enumerate the symbol table.
452	*/
453	const Elf_Sym *paSyms = pModElf->paSyms;
454	unsigned cSyms = pModElf->cSyms;
455	for (unsigned iSym = 1; iSym < cSyms; iSym++)
456	{
457	/*
458	* Skip imports (undefined).
459	*/
460	if (paSyms[iSym].st_shndx != SHN_UNDEF)
461	{
462	/*
463	* Calc value and get name.
464	*/
465	Elf_Addr Value;
466	if (paSyms[iSym].st_shndx == SHN_ABS)
467	/* absolute symbols are not subject to any relocation. */
468	Value = paSyms[iSym].st_value;
469	else if (paSyms[iSym].st_shndx < pModElf->Ehdr.e_shnum)
470	/* relative to the section. */
471	Value = BaseAddr + paSyms[iSym].st_value + pModElf->paShdrs[paSyms[iSym].st_shndx].sh_addr;
472	else
473	{
474	AssertMsgFailed(("Arg! paSyms[%u].st_shndx=" FMT_ELF_HALF "\n", iSym, paSyms[iSym].st_shndx));
475	return VERR_BAD_EXE_FORMAT;
476	}
477	const char *pszName = ELF_STR(pModElf, paSyms[iSym].st_name);
478	if ( (pszName && *pszName)
479	&& ( (fFlags & RTLDR_ENUM_SYMBOL_FLAGS_ALL)
480	\|\| ELF_ST_BIND(paSyms[iSym].st_info) == STB_GLOBAL)
481	)
482	{
483	/*
484	* Call back.
485	*/
486	AssertMsgReturn(Value == (RTUINTPTR)Value, (FMT_ELF_ADDR "\n", Value), VERR_SYMBOL_VALUE_TOO_BIG);
487	rc = pfnCallback(pMod, pszName, ~0, (RTUINTPTR)Value, pvUser);
488	if (rc)
489	return rc;
490	}
491	}
492	}
493
494	return VINF_SUCCESS;
495	}
496
497
498	/** @copydoc RTLDROPS::GetImageSize */
499	static DECLCALLBACK(size_t) RTLDRELF_NAME(GetImageSize)(PRTLDRMODINTERNAL pMod)
500	{
501	PRTLDRMODELF pModElf = (PRTLDRMODELF)pMod;
502
503	return pModElf->cbImage;
504	}
505
506
507	/** @copydoc RTLDROPS::GetBits */
508	static DECLCALLBACK(int) RTLDRELF_NAME(GetBits)(PRTLDRMODINTERNAL pMod, void pvBits, RTUINTPTR BaseAddress, PFNRTLDRIMPORT pfnGetImport, void pvUser)
509	{
510	PRTLDRMODELF pModElf = (PRTLDRMODELF)pMod;
511
512	/*
513	* Load the bits into pvBits.
514	*/
515	const Elf_Shdr *paShdrs = pModElf->paShdrs;
516	for (unsigned iShdr = 0; iShdr < pModElf->Ehdr.e_shnum; iShdr++)
517	{
518	if (paShdrs[iShdr].sh_flags & SHF_ALLOC)
519	{
520	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);
521	switch (paShdrs[iShdr].sh_type)
522	{
523	case SHT_NOBITS:
524	memset((uint8_t *)pvBits + paShdrs[iShdr].sh_addr, 0, (size_t)paShdrs[iShdr].sh_size);
525	break;
526
527	case SHT_PROGBITS:
528	default:
529	{
530	int rc = pModElf->pReader->pfnRead(pModElf->pReader, (uint8_t *)pvBits + paShdrs[iShdr].sh_addr,
531	(size_t)paShdrs[iShdr].sh_size, paShdrs[iShdr].sh_offset);
532	if (RT_FAILURE(rc))
533	{
534	Log(("RTLdrELF: %s: Read error when reading " FMT_ELF_SIZE " bytes at " FMT_ELF_OFF ", iShdr=%d\n",
535	pModElf->pReader->pfnLogName(pModElf->pReader),
536	paShdrs[iShdr].sh_size, paShdrs[iShdr].sh_offset, iShdr));
537	return rc;
538	}
539	}
540	}
541	}
542	}
543
544	/*
545	* Relocate the image.
546	*/
547	return pModElf->Core.pOps->pfnRelocate(pMod, pvBits, BaseAddress, ~(RTUINTPTR)0, pfnGetImport, pvUser);
548	}
549
550
551	/** @copydoc RTLDROPS::Relocate */
552	static DECLCALLBACK(int) RTLDRELF_NAME(Relocate)(PRTLDRMODINTERNAL pMod, void pvBits, RTUINTPTR NewBaseAddress, RTUINTPTR OldBaseAddress, PFNRTLDRIMPORT pfnGetImport, void pvUser)
553	{
554	PRTLDRMODELF pModElf = (PRTLDRMODELF)pMod;
555
556	/*
557	* Validate the input.
558	*/
559	Elf_Addr BaseAddr = (Elf_Addr)NewBaseAddress;
560	AssertMsgReturn((RTUINTPTR)BaseAddr == NewBaseAddress, ("#RTptr", NewBaseAddress), VERR_IMAGE_BASE_TOO_HIGH);
561
562	/*
563	* Map the image bits if not already done and setup pointer into it.
564	*/
565	int rc = RTLDRELF_NAME(MapBits)(pModElf, true);
566	if (RT_FAILURE(rc))
567	return rc;
568
569	/*
570	* Iterate the sections looking for interesting SHT_REL[A] sections.
571	* SHT_REL[A] sections have the section index of the section they contain fixups
572	* for in the sh_info member.
573	*/
574	const Elf_Shdr *paShdrs = pModElf->paShdrs;
575	#ifdef LOG_ENABLED
576	const char *pszLogName = pModElf->pReader->pfnLogName(pModElf->pReader);
577	Log2(("rtLdrElf: %s: Fixing up image\n", pszLogName));
578	#endif
579	for (unsigned iShdr = 0; iShdr < pModElf->Ehdr.e_shnum; iShdr++)
580	{
581	const Elf_Shdr *pShdrRel = &paShdrs[iShdr];
582
583	/*
584	* Skip sections without interest to us.
585	*/
586	#if ELF_MODE == 32
587	if (pShdrRel->sh_type != SHT_REL)
588	#else
589	if (pShdrRel->sh_type != SHT_RELA)
590	#endif
591	continue;
592	if (pShdrRel->sh_info >= pModElf->Ehdr.e_shnum)
593	continue;
594	const Elf_Shdr pShdr = &paShdrs[pShdrRel->sh_info]; / the section to fixup. */
595	if (!(pShdr->sh_flags & SHF_ALLOC))
596	continue;
597
598	/*
599	* Relocate the section.
600	*/
601	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",
602	pszLogName, (int)pShdrRel->sh_info, ELF_STR(pModElf, pShdr->sh_name), (int)pShdr->sh_info, (int)pShdr->sh_link,
603	iShdr, ELF_STR(pModElf, pShdrRel->sh_name), (int)pShdrRel->sh_info, (int)pShdrRel->sh_link));
604
605	/** @todo Make RelocateSection a function pointer so we can select the one corresponding to the machine when opening the image. */
606	rc = RTLDRELF_NAME(RelocateSection)(pModElf, BaseAddr, pfnGetImport, pvUser,
607	pShdr->sh_addr,
608	pShdr->sh_size,
609	(const uint8_t *)pModElf->pvBits + pShdr->sh_offset,
610	(uint8_t *)pvBits + pShdr->sh_addr,
611	(const uint8_t *)pModElf->pvBits + pShdrRel->sh_offset,
612	pShdrRel->sh_size);
613	if (RT_FAILURE(rc))
614	return rc;
615	}
616	return VINF_SUCCESS;
617	}
618
619
620	/** @copydoc RTLDROPS::pfnGetSymbolEx */
621	static DECLCALLBACK(int) RTLDRELF_NAME(GetSymbolEx)(PRTLDRMODINTERNAL pMod, const void pvBits, RTUINTPTR BaseAddress, const char pszSymbol, RTUINTPTR *pValue)
622	{
623	PRTLDRMODELF pModElf = (PRTLDRMODELF)pMod;
624	NOREF(pvBits);
625
626	/*
627	* Validate the input.
628	*/
629	Elf_Addr BaseAddr = (Elf_Addr)BaseAddress;
630	AssertMsgReturn((RTUINTPTR)BaseAddr == BaseAddress, ("#RTptr", BaseAddress), VERR_IMAGE_BASE_TOO_HIGH);
631
632	/*
633	* Map the image bits if not already done and setup pointer into it.
634	*/
635	int rc = RTLDRELF_NAME(MapBits)(pModElf, true);
636	if (RT_FAILURE(rc))
637	return rc;
638
639	/*
640	* Calc all kinds of pointers before we start iterating the symbol table.
641	*/
642	const char *pStr = pModElf->pStr;
643	const Elf_Sym *paSyms = pModElf->paSyms;
644	unsigned cSyms = pModElf->cSyms;
645	for (unsigned iSym = 1; iSym < cSyms; iSym++)
646	{
647	/* Undefined symbols are not exports, they are imports. */
648	if ( paSyms[iSym].st_shndx != SHN_UNDEF
649	&& ( ELF_ST_BIND(paSyms[iSym].st_info) == STB_GLOBAL
650	\|\| ELF_ST_BIND(paSyms[iSym].st_info) == STB_WEAK))
651	{
652	/* Validate the name string and try match with it. */
653	if (paSyms[iSym].st_name < pModElf->cbStr)
654	{
655	if (!strcmp(pszSymbol, pStr + paSyms[iSym].st_name))
656	{
657	/* matched! */
658	Elf_Addr Value;
659	if (paSyms[iSym].st_shndx == SHN_ABS)
660	/* absolute symbols are not subject to any relocation. */
661	Value = paSyms[iSym].st_value;
662	else if (paSyms[iSym].st_shndx < pModElf->Ehdr.e_shnum)
663	/* relative to the section. */
664	Value = BaseAddr + paSyms[iSym].st_value + pModElf->paShdrs[paSyms[iSym].st_shndx].sh_addr;
665	else
666	{
667	AssertMsgFailed(("Arg. paSyms[iSym].st_shndx=%d\n", paSyms[iSym].st_shndx));
668	return VERR_BAD_EXE_FORMAT;
669	}
670	AssertMsgReturn(Value == (RTUINTPTR)Value, (FMT_ELF_ADDR "\n", Value), VERR_SYMBOL_VALUE_TOO_BIG);
671	*pValue = (RTUINTPTR)Value;
672	return VINF_SUCCESS;
673	}
674	}
675	else
676	{
677	AssertMsgFailed(("String outside string table! iSym=%d paSyms[iSym].st_name=%#x\n", iSym, paSyms[iSym].st_name));
678	return VERR_LDRELF_INVALID_SYMBOL_NAME_OFFSET;
679	}
680	}
681	}
682
683	return VERR_SYMBOL_NOT_FOUND;
684	}
685
686
687	/** @copydoc RTLDROPS::pfnEnumDbgInfo */
688	static DECLCALLBACK(int) RTLDRELF_NAME(EnumDbgInfo)(PRTLDRMODINTERNAL pMod, const void *pvBits,
689	PFNRTLDRENUMDBG pfnCallback, void *pvUser)
690	{
691	PRTLDRMODELF pModElf = (PRTLDRMODELF)pMod;
692	NOREF(pvBits);
693
694	return VERR_NOT_IMPLEMENTED;
695	}
696
697
698	/**
699	* The ELF module operations.
700	*/
701	static RTLDROPS RTLDRELF_MID(s_rtldrElf,Ops) =
702	{
703	#if ELF_MODE == 32
704	"elf32",
705	#elif ELF_MODE == 64
706	"elf64",
707	#endif
708	RTLDRELF_NAME(Close),
709	NULL, /* Get Symbol */
710	RTLDRELF_NAME(Done),
711	RTLDRELF_NAME(EnumSymbols),
712	/* ext: */
713	RTLDRELF_NAME(GetImageSize),
714	RTLDRELF_NAME(GetBits),
715	RTLDRELF_NAME(Relocate),
716	RTLDRELF_NAME(GetSymbolEx),
717	RTLDRELF_NAME(EnumDbgInfo),
718	42
719	};
720
721
722
723	/**
724	* Validates the ELF header.
725	*
726	* @returns iprt status code.
727	* @param pEhdr Pointer to the ELF header.
728	* @param pszLogName The log name.
729	* @param cbRawImage The size of the raw image.
730	*/
731	static int RTLDRELF_NAME(ValidateElfHeader)(const Elf_Ehdr pEhdr, const char pszLogName, uint64_t cbRawImage, PRTLDRARCH penmArch)
732	{
733	Log3(("RTLdrELF: e_ident: %.*Rhxs\n"
734	"RTLdrELF: e_type: " FMT_ELF_HALF "\n"
735	"RTLdrELF: e_version: " FMT_ELF_HALF "\n"
736	"RTLdrELF: e_entry: " FMT_ELF_ADDR "\n"
737	"RTLdrELF: e_phoff: " FMT_ELF_OFF "\n"
738	"RTLdrELF: e_shoff: " FMT_ELF_OFF "\n"
739	"RTLdrELF: e_flags: " FMT_ELF_WORD "\n"
740	"RTLdrELF: e_ehsize: " FMT_ELF_HALF "\n"
741	"RTLdrELF: e_phentsize: " FMT_ELF_HALF "\n"
742	"RTLdrELF: e_phnum: " FMT_ELF_HALF "\n"
743	"RTLdrELF: e_shentsize: " FMT_ELF_HALF "\n"
744	"RTLdrELF: e_shnum: " FMT_ELF_HALF "\n"
745	"RTLdrELF: e_shstrndx: " FMT_ELF_HALF "\n",
746	RT_ELEMENTS(pEhdr->e_ident), &pEhdr->e_ident[0], pEhdr->e_type, pEhdr->e_version,
747	pEhdr->e_entry, pEhdr->e_phoff, pEhdr->e_shoff,pEhdr->e_flags, pEhdr->e_ehsize, pEhdr->e_phentsize,
748	pEhdr->e_phnum, pEhdr->e_shentsize, pEhdr->e_shnum, pEhdr->e_shstrndx));
749
750	if ( pEhdr->e_ident[EI_MAG0] != ELFMAG0
751	\|\| pEhdr->e_ident[EI_MAG1] != ELFMAG1
752	\|\| pEhdr->e_ident[EI_MAG2] != ELFMAG2
753	\|\| pEhdr->e_ident[EI_MAG3] != ELFMAG3
754	)
755	{
756	Log(("RTLdrELF: %s: Invalid ELF magic (%.*Rhxs)\n", pszLogName, sizeof(pEhdr->e_ident), pEhdr->e_ident));
757	return VERR_BAD_EXE_FORMAT;
758	}
759	if (pEhdr->e_ident[EI_CLASS] != RTLDRELF_SUFF(ELFCLASS))
760	{
761	Log(("RTLdrELF: %s: Invalid ELF class (%.*Rhxs)\n", pszLogName, sizeof(pEhdr->e_ident), pEhdr->e_ident));
762	return VERR_BAD_EXE_FORMAT;
763	}
764	if (pEhdr->e_ident[EI_DATA] != ELFDATA2LSB)
765	{
766	Log(("RTLdrELF: %s: ELF endian %x is unsupported\n", pEhdr->e_ident[EI_DATA]));
767	return VERR_LDRELF_ODD_ENDIAN;
768	}
769	if (pEhdr->e_version != EV_CURRENT)
770	{
771	Log(("RTLdrELF: %s: ELF version %x is unsupported\n", pEhdr->e_version));
772	return VERR_LDRELF_VERSION;
773	}
774
775	if (sizeof(Elf_Ehdr) != pEhdr->e_ehsize)
776	{
777	Log(("RTLdrELF: %s: Elf header e_ehsize is %d expected %d!\n",
778	pszLogName, pEhdr->e_ehsize, sizeof(Elf_Ehdr)));
779	return VERR_BAD_EXE_FORMAT;
780	}
781	if ( sizeof(Elf_Phdr) != pEhdr->e_phentsize
782	&& ( pEhdr->e_phnum != 0
783	\|\| pEhdr->e_type == ET_DYN))
784	{
785	Log(("RTLdrELF: %s: Elf header e_phentsize is %d expected %d!\n",
786	pszLogName, pEhdr->e_phentsize, sizeof(Elf_Phdr)));
787	return VERR_BAD_EXE_FORMAT;
788	}
789	if (sizeof(Elf_Shdr) != pEhdr->e_shentsize)
790	{
791	Log(("RTLdrELF: %s: Elf header e_shentsize is %d expected %d!\n",
792	pszLogName, pEhdr->e_shentsize, sizeof(Elf_Shdr)));
793	return VERR_BAD_EXE_FORMAT;
794	}
795
796	switch (pEhdr->e_type)
797	{
798	case ET_REL:
799	break;
800	case ET_EXEC:
801	Log(("RTLdrELF: %s: Executable images are not supported yet!\n", pszLogName));
802	return VERR_LDRELF_EXEC;
803	case ET_DYN:
804	Log(("RTLdrELF: %s: Dynamic images are not supported yet!\n", pszLogName));
805	return VERR_LDRELF_DYN;
806	default:
807	Log(("RTLdrELF: %s: image type %#x is not supported!\n", pszLogName, pEhdr->e_type));
808	return VERR_BAD_EXE_FORMAT;
809	}
810
811	switch (pEhdr->e_machine)
812	{
813	#if ELF_MODE == 32
814	case EM_386:
815	case EM_486:
816	*penmArch = RTLDRARCH_X86_32;
817	break;
818	#elif ELF_MODE == 64
819	case EM_X86_64:
820	*penmArch = RTLDRARCH_AMD64;
821	break;
822	#endif
823	default:
824	Log(("RTLdrELF: %s: machine type %u is not supported!\n", pEhdr->e_machine));
825	return VERR_LDRELF_MACHINE;
826	}
827
828	if ( pEhdr->e_phoff < pEhdr->e_ehsize
829	&& !(pEhdr->e_phoff && pEhdr->e_phnum)
830	&& pEhdr->e_phnum)
831	{
832	Log(("RTLdrELF: %s: The program headers overlap with the ELF header! e_phoff=" FMT_ELF_OFF "\n",
833	pszLogName, pEhdr->e_phoff));
834	return VERR_BAD_EXE_FORMAT;
835	}
836	if ( pEhdr->e_phoff + pEhdr->e_phnum * pEhdr->e_phentsize > cbRawImage
837	\|\| pEhdr->e_phoff + pEhdr->e_phnum * pEhdr->e_phentsize < pEhdr->e_phoff)
838	{
839	Log(("RTLdrELF: %s: The program headers extends beyond the file! e_phoff=" FMT_ELF_OFF " e_phnum=" FMT_ELF_HALF "\n",
840	pszLogName, pEhdr->e_phoff, pEhdr->e_phnum));
841	return VERR_BAD_EXE_FORMAT;
842	}
843
844
845	if ( pEhdr->e_shoff < pEhdr->e_ehsize
846	&& !(pEhdr->e_shoff && pEhdr->e_shnum))
847	{
848	Log(("RTLdrELF: %s: The section headers overlap with the ELF header! e_shoff=" FMT_ELF_OFF "\n",
849	pszLogName, pEhdr->e_shoff));
850	return VERR_BAD_EXE_FORMAT;
851	}
852	if ( pEhdr->e_shoff + pEhdr->e_shnum * pEhdr->e_shentsize > cbRawImage
853	\|\| pEhdr->e_shoff + pEhdr->e_shnum * pEhdr->e_shentsize < pEhdr->e_shoff)
854	{
855	Log(("RTLdrELF: %s: The section headers extends beyond the file! e_shoff=" FMT_ELF_OFF " e_shnum=" FMT_ELF_HALF "\n",
856	pszLogName, pEhdr->e_shoff, pEhdr->e_shnum));
857	return VERR_BAD_EXE_FORMAT;
858	}
859
860	return VINF_SUCCESS;
861	}
862
863	/**
864	* Gets the section header name.
865	*
866	* @returns pszName.
867	* @param pReader The loader reader instance.
868	* @param pEhdr The elf header.
869	* @param offName The offset of the section header name.
870	* @param pszName Where to store the name.
871	* @param cbName The size of the buffer pointed to by pszName.
872	*/
873	const char RTLDRELF_NAME(GetSHdrName)(PRTLDRMODELF pModElf, Elf_Word offName, char pszName, size_t cbName)
874	{
875	RTFOFF off = pModElf->paShdrs[pModElf->Ehdr.e_shstrndx].sh_offset + offName;
876	int rc = pModElf->pReader->pfnRead(pModElf->pReader, pszName, cbName - 1, off);
877	if (RT_FAILURE(rc))
878	{
879	/* read by for byte. */
880	for (unsigned i = 0; i < cbName; i++, off++)
881	{
882	rc = pModElf->pReader->pfnRead(pModElf->pReader, pszName + i, 1, off);
883	if (RT_FAILURE(rc))
884	{
885	pszName[i] = '\0';
886	break;
887	}
888	}
889	}
890
891	pszName[cbName - 1] = '\0';
892	return pszName;
893	}
894
895
896	/**
897	* Validates a section header.
898	*
899	* @returns iprt status code.
900	* @param pModElf Pointer to the module structure.
901	* @param iShdr The index of section header which should be validated.
902	* The section headers are found in the pModElf->paShdrs array.
903	* @param pszLogName The log name.
904	* @param cbRawImage The size of the raw image.
905	*/
906	static int RTLDRELF_NAME(ValidateSectionHeader)(PRTLDRMODELF pModElf, unsigned iShdr, const char *pszLogName, RTFOFF cbRawImage)
907	{
908	const Elf_Shdr *pShdr = &pModElf->paShdrs[iShdr];
909	char szSectionName[80]; NOREF(szSectionName);
910	Log3(("RTLdrELF: Section Header #%d:\n"
911	"RTLdrELF: sh_name: " FMT_ELF_WORD " - %s\n"
912	"RTLdrELF: sh_type: " FMT_ELF_WORD " (%s)\n"
913	"RTLdrELF: sh_flags: " FMT_ELF_XWORD "\n"
914	"RTLdrELF: sh_addr: " FMT_ELF_ADDR "\n"
915	"RTLdrELF: sh_offset: " FMT_ELF_OFF "\n"
916	"RTLdrELF: sh_size: " FMT_ELF_XWORD "\n"
917	"RTLdrELF: sh_link: " FMT_ELF_WORD "\n"
918	"RTLdrELF: sh_info: " FMT_ELF_WORD "\n"
919	"RTLdrELF: sh_addralign: " FMT_ELF_XWORD "\n"
920	"RTLdrELF: sh_entsize: " FMT_ELF_XWORD "\n",
921	iShdr,
922	pShdr->sh_name, RTLDRELF_NAME(GetSHdrName)(pModElf, pShdr->sh_name, szSectionName, sizeof(szSectionName)),
923	pShdr->sh_type, rtldrElfGetShdrType(pShdr->sh_type), pShdr->sh_flags, pShdr->sh_addr,
924	pShdr->sh_offset, pShdr->sh_size, pShdr->sh_link, pShdr->sh_info, pShdr->sh_addralign,
925	pShdr->sh_entsize));
926
927	if (pShdr->sh_link >= pModElf->Ehdr.e_shnum)
928	{
929	Log(("RTLdrELF: %s: Shdr #%d: sh_link (%d) is beyond the end of the section table (%d)!\n",
930	pszLogName, iShdr, pShdr->sh_link, pModElf->Ehdr.e_shnum));
931	return VERR_BAD_EXE_FORMAT;
932	}
933
934	switch (pShdr->sh_type)
935	{
936	/** @todo find specs and check up which sh_info fields indicates section table entries */
937	case 12301230:
938	if (pShdr->sh_info >= pModElf->Ehdr.e_shnum)
939	{
940	Log(("RTLdrELF: %s: Shdr #%d: sh_info (%d) is beyond the end of the section table (%d)!\n",
941	pszLogName, iShdr, pShdr->sh_link, pModElf->Ehdr.e_shnum));
942	return VERR_BAD_EXE_FORMAT;
943	}
944	break;
945
946	case SHT_NULL:
947	case SHT_PROGBITS:
948	case SHT_SYMTAB:
949	case SHT_STRTAB:
950	case SHT_RELA:
951	case SHT_HASH:
952	case SHT_DYNAMIC:
953	case SHT_NOTE:
954	case SHT_NOBITS:
955	case SHT_REL:
956	case SHT_SHLIB:
957	case SHT_DYNSYM:
958	/*
959	* For these types sh_info doesn't have any special meaning, or anything which
960	* we need/can validate now.
961	*/
962	break;
963
964
965	default:
966	Log(("RTLdrELF: %s: Warning, unknown type %d!\n", pszLogName, pShdr->sh_type));
967	break;
968	}
969
970	if ( pShdr->sh_type != SHT_NOBITS
971	&& pShdr->sh_size)
972	{
973	RTFOFF offEnd = pShdr->sh_offset + pShdr->sh_size;
974	if ( offEnd > cbRawImage
975	\|\| offEnd < (RTFOFF)pShdr->sh_offset)
976	{
977	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",
978	pszLogName, iShdr, pShdr->sh_offset, pShdr->sh_size, offEnd, cbRawImage));
979	return VERR_BAD_EXE_FORMAT;
980	}
981	if (pShdr->sh_offset < sizeof(Elf_Ehdr))
982	{
983	Log(("RTLdrELF: %s: Shdr #%d: sh_offset (" FMT_ELF_OFF ") + sh_size (" FMT_ELF_XWORD ") is starting in the ELF header!\n",
984	pszLogName, iShdr, pShdr->sh_offset, pShdr->sh_size, cbRawImage));
985	return VERR_BAD_EXE_FORMAT;
986	}
987	}
988
989	return VINF_SUCCESS;
990	}
991
992
993
994	/**
995	* Opens an ELF image, fixed bitness.
996	*
997	* @returns iprt status code.
998	* @param pReader The loader reader instance which will provide the raw image bits.
999	* @param fFlags Reserved, MBZ.
1000	* @param enmArch Architecture specifier.
1001	* @param phLdrMod Where to store the handle.
1002	*/
1003	static int RTLDRELF_NAME(Open)(PRTLDRREADER pReader, uint32_t fFlags, RTLDRARCH enmArch, PRTLDRMOD phLdrMod)
1004	{
1005	const char *pszLogName = pReader->pfnLogName(pReader);
1006	RTFOFF cbRawImage = pReader->pfnSize(pReader);
1007
1008	/*
1009	* Create the loader module instance.
1010	*/
1011	PRTLDRMODELF pModElf = (PRTLDRMODELF)RTMemAllocZ(sizeof(*pModElf));
1012	if (!pModElf)
1013	return VERR_NO_MEMORY;
1014
1015	pModElf->Core.u32Magic = RTLDRMOD_MAGIC;
1016	pModElf->Core.eState = LDR_STATE_INVALID;
1017	pModElf->pReader = pReader;
1018	//pModElf->pvBits = NULL;
1019	//pModElf->Ehdr = {0};
1020	//pModElf->paShdrs = NULL;
1021	//pModElf->paSyms = NULL;
1022	pModElf->iSymSh = ~0U;
1023	pModElf->cSyms = 0;
1024	pModElf->iStrSh = ~0U;
1025	pModElf->cbStr = 0;
1026	pModElf->cbImage = 0;
1027	//pModElf->pStr = NULL;
1028
1029	/*
1030	* Read and validate the ELF header and match up the CPU architecture.
1031	*/
1032	int rc = pReader->pfnRead(pReader, &pModElf->Ehdr, sizeof(pModElf->Ehdr), 0);
1033	if (RT_SUCCESS(rc))
1034	{
1035	RTLDRARCH enmArchImage = RTLDRARCH_INVALID; /* shut up gcc */
1036	rc = RTLDRELF_NAME(ValidateElfHeader)(&pModElf->Ehdr, pszLogName, cbRawImage, &enmArchImage);
1037	if (RT_SUCCESS(rc))
1038	{
1039	if ( enmArch != RTLDRARCH_WHATEVER
1040	&& enmArch != enmArchImage)
1041	rc = VERR_LDR_ARCH_MISMATCH;
1042	}
1043	}
1044	if (RT_SUCCESS(rc))
1045	{
1046	/*
1047	* Read the section headers.
1048	*/
1049	Elf_Shdr paShdrs = (Elf_Shdr )RTMemAlloc(pModElf->Ehdr.e_shnum * sizeof(Elf_Shdr));
1050	if (paShdrs)
1051	{
1052	pModElf->paShdrs = paShdrs;
1053	rc = pReader->pfnRead(pReader, paShdrs, pModElf->Ehdr.e_shnum * sizeof(Elf_Shdr),
1054	pModElf->Ehdr.e_shoff);
1055	if (RT_SUCCESS(rc))
1056	{
1057	/*
1058	* Validate the section headers, allocate memory for the sections (determine the image size),
1059	* and find relevant sections.
1060	*/
1061	for (unsigned i = 0; i < pModElf->Ehdr.e_shnum; i++)
1062	{
1063	rc = RTLDRELF_NAME(ValidateSectionHeader)(pModElf, i, pszLogName, cbRawImage);
1064	if (RT_FAILURE(rc))
1065	break;
1066
1067	/* Allocate memory addresses for the section. */
1068	if (paShdrs[i].sh_flags & SHF_ALLOC)
1069	{
1070	paShdrs[i].sh_addr = paShdrs[i].sh_addralign
1071	? RT_ALIGN_T(pModElf->cbImage, paShdrs[i].sh_addralign, Elf_Addr)
1072	: (Elf_Addr)pModElf->cbImage;
1073	pModElf->cbImage = (size_t)paShdrs[i].sh_addr + (size_t)paShdrs[i].sh_size;
1074	AssertMsgReturn(pModElf->cbImage == paShdrs[i].sh_addr + paShdrs[i].sh_size,
1075	(FMT_ELF_ADDR "\n", paShdrs[i].sh_addr + paShdrs[i].sh_size),
1076	VERR_IMAGE_TOO_BIG);
1077	Log2(("RTLdrElf: %s: Assigned " FMT_ELF_ADDR " to section #%d\n", pszLogName, paShdrs[i].sh_addr, i));
1078	}
1079
1080	/* We're looking for symbol tables. */
1081	if (paShdrs[i].sh_type == SHT_SYMTAB)
1082	{
1083	if (pModElf->iSymSh != ~0U)
1084	{
1085	Log(("RTLdrElf: %s: Multiple symbol tabs! iSymSh=%d i=%d\n", pszLogName, pModElf->iSymSh, i));
1086	rc = VERR_LDRELF_MULTIPLE_SYMTABS;
1087	break;
1088	}
1089	pModElf->iSymSh = i;
1090	pModElf->cSyms = (unsigned)(paShdrs[i].sh_size / sizeof(Elf_Sym));
1091	AssertReturn(pModElf->cSyms == paShdrs[i].sh_size / sizeof(Elf_Sym), VERR_IMAGE_TOO_BIG);
1092	pModElf->iStrSh = paShdrs[i].sh_link;
1093	pModElf->cbStr = (unsigned)paShdrs[pModElf->iStrSh].sh_size;
1094	AssertReturn(pModElf->cbStr == paShdrs[pModElf->iStrSh].sh_size, VERR_IMAGE_TOO_BIG);
1095	}
1096	} /* for each section header */
1097
1098	Log2(("RTLdrElf: iSymSh=%u cSyms=%u iStrSh=%u cbStr=%u rc=%Rrc cbImage=%#zx\n",
1099	pModElf->iSymSh, pModElf->cSyms, pModElf->iStrSh, pModElf->cbStr, rc, pModElf->cbImage));
1100
1101	/*
1102	* Are the section headers fine?
1103	* We require there to be symbol & string tables (at least for the time being).
1104	*/
1105	if ( pModElf->iSymSh == ~0U
1106	\|\| pModElf->iStrSh == ~0U)
1107	rc = VERR_LDRELF_NO_SYMBOL_OR_NO_STRING_TABS;
1108	if (RT_SUCCESS(rc))
1109	{
1110	pModElf->Core.pOps = &RTLDRELF_MID(s_rtldrElf,Ops);
1111	pModElf->Core.eState = LDR_STATE_OPENED;
1112	*phLdrMod = &pModElf->Core;
1113
1114	LogFlow(("%s: %s: returns VINF_SUCCESS phLdrMod=%p\n", __FUNCTION__, pszLogName, phLdrMod));
1115	return VINF_SUCCESS;
1116	}
1117	}
1118
1119	RTMemFree(paShdrs);
1120	}
1121	else
1122	rc = VERR_NO_MEMORY;
1123	}
1124
1125	RTMemFree(pModElf);
1126	LogFlow(("%s: returns %Rrc\n", __FUNCTION__, rc));
1127	return rc;
1128	}
1129
1130
1131
1132
1133	/*******************************************************************************
1134	* Cleanup Constants And Macros *
1135	*******************************************************************************/
1136	#undef RTLDRELF_NAME
1137	#undef RTLDRELF_SUFF
1138	#undef RTLDRELF_MID
1139
1140	#undef FMT_ELF_ADDR
1141	#undef FMT_ELF_HALF
1142	#undef FMT_ELF_SHALF
1143	#undef FMT_ELF_OFF
1144	#undef FMT_ELF_SIZE
1145	#undef FMT_ELF_SWORD
1146	#undef FMT_ELF_WORD
1147	#undef FMT_ELF_XWORD
1148	#undef FMT_ELF_SXWORD
1149
1150	#undef Elf_Ehdr
1151	#undef Elf_Phdr
1152	#undef Elf_Shdr
1153	#undef Elf_Sym
1154	#undef Elf_Rel
1155	#undef Elf_Rela
1156	#undef Elf_Reloc
1157	#undef Elf_Nhdr
1158	#undef Elf_Dyn
1159
1160	#undef Elf_Addr
1161	#undef Elf_Half
1162	#undef Elf_Off
1163	#undef Elf_Size
1164	#undef Elf_Sword
1165	#undef Elf_Word
1166
1167	#undef RTLDRMODELF
1168	#undef PRTLDRMODELF
1169
1170	#undef ELF_R_SYM
1171	#undef ELF_R_TYPE
1172	#undef ELF_R_INFO
1173
1174	#undef ELF_ST_BIND
1175

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source: vbox/trunk/src/VBox/Runtime/common/ldr/ldrELFRelocatable.cpp.h@ 38515

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