ldrELFRelocatable.cpp.h@ 39436

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1	/* $Id: ldrELFRelocatable.cpp.h 39083 2011-10-22 00:28:46Z 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.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 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	#if ELF_MODE != 32
267	NOREF(pu8SecBaseR);
268	#endif
269
270	/*
271	* Iterate the relocations.
272	* The relocations are stored in an array of Elf32_Rel records and covers the entire relocation section.
273	*/
274	const Elf_Reloc paRels = (const Elf_Reloc )pvRelocs;
275	const unsigned iRelMax = (unsigned)(cbRelocs / sizeof(paRels[0]));
276	AssertMsgReturn(iRelMax == cbRelocs / sizeof(paRels[0]), (FMT_ELF_SIZE "\n", cbRelocs / sizeof(paRels[0])), VERR_IMAGE_TOO_BIG);
277	for (unsigned iRel = 0; iRel < iRelMax; iRel++)
278	{
279	/*
280	* Get the symbol.
281	*/
282	const Elf_Sym *pSym;
283	Elf_Addr SymValue = 0; /* shut up gcc-4 */
284	int rc = RTLDRELF_NAME(Symbol)(pModElf, BaseAddr, pfnGetImport, pvUser, ELF_R_SYM(paRels[iRel].r_info), &pSym, &SymValue);
285	if (RT_FAILURE(rc))
286	return rc;
287
288	Log3(("rtldrELF: " FMT_ELF_ADDR " %02x %06x - " FMT_ELF_ADDR " %3d %02x %s\n",
289	paRels[iRel].r_offset, ELF_R_TYPE(paRels[iRel].r_info), (unsigned)ELF_R_SYM(paRels[iRel].r_info),
290	SymValue, (unsigned)pSym->st_shndx, pSym->st_info, ELF_STR(pModElf, pSym->st_name)));
291
292	/*
293	* Apply the fixup.
294	*/
295	AssertMsgReturn(paRels[iRel].r_offset < cbSec, (FMT_ELF_ADDR " " FMT_ELF_SIZE "\n", paRels[iRel].r_offset, cbSec), VERR_LDRELF_INVALID_RELOCATION_OFFSET);
296	#if ELF_MODE == 32
297	const Elf_Addr pAddrR = (const Elf_Addr )(pu8SecBaseR + paRels[iRel].r_offset); /* Where to read the addend. */
298	#endif
299	Elf_Addr pAddrW = (Elf_Addr )(pu8SecBaseW + paRels[iRel].r_offset); /* Where to write the fixup. */
300	switch (ELF_R_TYPE(paRels[iRel].r_info))
301	{
302	#if ELF_MODE == 32
303	/*
304	* Absolute addressing.
305	*/
306	case R_386_32:
307	{
308	const Elf_Addr Value = SymValue + *pAddrR;
309	(uint32_t )pAddrW = Value;
310	Log4((FMT_ELF_ADDR": R_386_32 Value=" FMT_ELF_ADDR " SymValue=" FMT_ELF_ADDR "\n",
311	SecAddr + paRels[iRel].r_offset + BaseAddr, Value, SymValue));
312	break;
313	}
314
315	/*
316	* PC relative addressing.
317	*/
318	case R_386_PC32:
319	{
320	const Elf_Addr SourceAddr = SecAddr + paRels[iRel].r_offset + BaseAddr; /* Where the source really is. */
321	const Elf_Addr Value = SymValue + (uint32_t )pAddrR - SourceAddr;
322	(uint32_t )pAddrW = Value;
323	Log4((FMT_ELF_ADDR": R_386_PC32 Value=" FMT_ELF_ADDR " SymValue=" FMT_ELF_ADDR "\n",
324	SourceAddr, Value, SymValue));
325	break;
326	}
327
328	/* ignore */
329	case R_386_NONE:
330	break;
331
332	#elif ELF_MODE == 64
333
334	/*
335	* Absolute addressing
336	*/
337	case R_X86_64_64:
338	{
339	const Elf_Addr Value = SymValue + paRels[iRel].r_addend;
340	(uint64_t )pAddrW = Value;
341	Log4((FMT_ELF_ADDR": R_X86_64_64 Value=" FMT_ELF_ADDR " SymValue=" FMT_ELF_ADDR "\n",
342	SecAddr + paRels[iRel].r_offset + BaseAddr, Value, SymValue));
343	break;
344	}
345
346	/*
347	* Truncated 32-bit value (zero-extendedable to the 64-bit value).
348	*/
349	case R_X86_64_32:
350	{
351	const Elf_Addr Value = SymValue + paRels[iRel].r_addend;
352	(uint32_t )pAddrW = (uint32_t)Value;
353	Log4((FMT_ELF_ADDR": R_X86_64_32 Value=" FMT_ELF_ADDR " SymValue=" FMT_ELF_ADDR "\n",
354	SecAddr + paRels[iRel].r_offset + BaseAddr, Value, SymValue));
355	AssertMsgReturn((Elf_Addr)(uint32_t )pAddrW == Value, ("Value=" FMT_ELF_ADDR "\n", Value), VERR_SYMBOL_VALUE_TOO_BIG);
356	break;
357	}
358
359	/*
360	* Truncated 32-bit value (sign-extendedable to the 64-bit value).
361	*/
362	case R_X86_64_32S:
363	{
364	const Elf_Addr Value = SymValue + paRels[iRel].r_addend;
365	(int32_t )pAddrW = (int32_t)Value;
366	Log4((FMT_ELF_ADDR": R_X86_64_32S Value=" FMT_ELF_ADDR " SymValue=" FMT_ELF_ADDR "\n",
367	SecAddr + paRels[iRel].r_offset + BaseAddr, 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
372	/*
373	* PC relative addressing.
374	*/
375	case R_X86_64_PC32:
376	{
377	const Elf_Addr SourceAddr = SecAddr + paRels[iRel].r_offset + BaseAddr; /* Where the source really is. */
378	const Elf_Addr Value = SymValue + paRels[iRel].r_addend - SourceAddr;
379	(int32_t )pAddrW = (int32_t)Value;
380	Log4((FMT_ELF_ADDR": R_X86_64_PC32 Value=" FMT_ELF_ADDR " SymValue=" FMT_ELF_ADDR "\n",
381	SourceAddr, Value, SymValue));
382	AssertMsgReturn((Elf_Addr)(int32_t )pAddrW == Value, ("Value=" FMT_ELF_ADDR "\n", Value), VERR_SYMBOL_VALUE_TOO_BIG); /** @todo check the sign-extending here. */
383	break;
384	}
385
386	/* ignore */
387	case R_X86_64_NONE:
388	break;
389	#endif
390
391	default:
392	AssertMsgFailed(("Unknown relocation type: %d (iRel=%d iRelMax=%d)\n",
393	ELF_R_TYPE(paRels[iRel].r_info), iRel, iRelMax));
394	return VERR_LDRELF_RELOCATION_NOT_SUPPORTED;
395	}
396	}
397
398	return VINF_SUCCESS;
399	}
400
401
402
403	/** @copydoc RTLDROPS::pfnClose */
404	static DECLCALLBACK(int) RTLDRELF_NAME(Close)(PRTLDRMODINTERNAL pMod)
405	{
406	PRTLDRMODELF pModElf = (PRTLDRMODELF)pMod;
407
408	if (pModElf->paShdrs)
409	{
410	RTMemFree(pModElf->paShdrs);
411	pModElf->paShdrs = NULL;
412	}
413
414	if (pModElf->pReader)
415	{
416	pModElf->pReader->pfnDestroy(pModElf->pReader);
417	pModElf->pReader = NULL;
418	}
419
420	pModElf->pvBits = NULL;
421
422	return VINF_SUCCESS;
423	}
424
425
426	/** @copydoc RTLDROPS::Done */
427	static DECLCALLBACK(int) RTLDRELF_NAME(Done)(PRTLDRMODINTERNAL pMod)
428	{
429	NOREF(pMod); /PRTLDRMODELF pModElf = (PRTLDRMODELF)pMod;/
430	/** @todo Have to think more about this .... */
431	return -1;
432	}
433
434
435	/** @copydoc RTLDROPS::EnumSymbols */
436	static DECLCALLBACK(int) RTLDRELF_NAME(EnumSymbols)(PRTLDRMODINTERNAL pMod, unsigned fFlags, const void *pvBits, RTUINTPTR BaseAddress,
437	PFNRTLDRENUMSYMS pfnCallback, void *pvUser)
438	{
439	PRTLDRMODELF pModElf = (PRTLDRMODELF)pMod;
440	NOREF(pvBits);
441
442	/*
443	* Validate the input.
444	*/
445	Elf_Addr BaseAddr = (Elf_Addr)BaseAddress;
446	AssertMsgReturn((RTUINTPTR)BaseAddr == BaseAddress, ("#RTptr", BaseAddress), VERR_IMAGE_BASE_TOO_HIGH);
447
448	/*
449	* Make sure we've got the string and symbol tables. (We don't need the pvBits.)
450	*/
451	int rc = RTLDRELF_NAME(MapBits)(pModElf, false);
452	if (RT_FAILURE(rc))
453	return rc;
454
455	/*
456	* Enumerate the symbol table.
457	*/
458	const Elf_Sym *paSyms = pModElf->paSyms;
459	unsigned cSyms = pModElf->cSyms;
460	for (unsigned iSym = 1; iSym < cSyms; iSym++)
461	{
462	/*
463	* Skip imports (undefined).
464	*/
465	if (paSyms[iSym].st_shndx != SHN_UNDEF)
466	{
467	/*
468	* Calc value and get name.
469	*/
470	Elf_Addr Value;
471	if (paSyms[iSym].st_shndx == SHN_ABS)
472	/* absolute symbols are not subject to any relocation. */
473	Value = paSyms[iSym].st_value;
474	else if (paSyms[iSym].st_shndx < pModElf->Ehdr.e_shnum)
475	/* relative to the section. */
476	Value = BaseAddr + paSyms[iSym].st_value + pModElf->paShdrs[paSyms[iSym].st_shndx].sh_addr;
477	else
478	{
479	AssertMsgFailed(("Arg! paSyms[%u].st_shndx=" FMT_ELF_HALF "\n", iSym, paSyms[iSym].st_shndx));
480	return VERR_BAD_EXE_FORMAT;
481	}
482	const char *pszName = ELF_STR(pModElf, paSyms[iSym].st_name);
483	if ( (pszName && *pszName)
484	&& ( (fFlags & RTLDR_ENUM_SYMBOL_FLAGS_ALL)
485	\|\| ELF_ST_BIND(paSyms[iSym].st_info) == STB_GLOBAL)
486	)
487	{
488	/*
489	* Call back.
490	*/
491	AssertMsgReturn(Value == (RTUINTPTR)Value, (FMT_ELF_ADDR "\n", Value), VERR_SYMBOL_VALUE_TOO_BIG);
492	rc = pfnCallback(pMod, pszName, ~0, (RTUINTPTR)Value, pvUser);
493	if (rc)
494	return rc;
495	}
496	}
497	}
498
499	return VINF_SUCCESS;
500	}
501
502
503	/** @copydoc RTLDROPS::GetImageSize */
504	static DECLCALLBACK(size_t) RTLDRELF_NAME(GetImageSize)(PRTLDRMODINTERNAL pMod)
505	{
506	PRTLDRMODELF pModElf = (PRTLDRMODELF)pMod;
507
508	return pModElf->cbImage;
509	}
510
511
512	/** @copydoc RTLDROPS::GetBits */
513	static DECLCALLBACK(int) RTLDRELF_NAME(GetBits)(PRTLDRMODINTERNAL pMod, void pvBits, RTUINTPTR BaseAddress, PFNRTLDRIMPORT pfnGetImport, void pvUser)
514	{
515	PRTLDRMODELF pModElf = (PRTLDRMODELF)pMod;
516
517	/*
518	* Load the bits into pvBits.
519	*/
520	const Elf_Shdr *paShdrs = pModElf->paShdrs;
521	for (unsigned iShdr = 0; iShdr < pModElf->Ehdr.e_shnum; iShdr++)
522	{
523	if (paShdrs[iShdr].sh_flags & SHF_ALLOC)
524	{
525	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);
526	switch (paShdrs[iShdr].sh_type)
527	{
528	case SHT_NOBITS:
529	memset((uint8_t *)pvBits + paShdrs[iShdr].sh_addr, 0, (size_t)paShdrs[iShdr].sh_size);
530	break;
531
532	case SHT_PROGBITS:
533	default:
534	{
535	int rc = pModElf->pReader->pfnRead(pModElf->pReader, (uint8_t *)pvBits + paShdrs[iShdr].sh_addr,
536	(size_t)paShdrs[iShdr].sh_size, paShdrs[iShdr].sh_offset);
537	if (RT_FAILURE(rc))
538	{
539	Log(("RTLdrELF: %s: Read error when reading " FMT_ELF_SIZE " bytes at " FMT_ELF_OFF ", iShdr=%d\n",
540	pModElf->pReader->pfnLogName(pModElf->pReader),
541	paShdrs[iShdr].sh_size, paShdrs[iShdr].sh_offset, iShdr));
542	return rc;
543	}
544	}
545	}
546	}
547	}
548
549	/*
550	* Relocate the image.
551	*/
552	return pModElf->Core.pOps->pfnRelocate(pMod, pvBits, BaseAddress, ~(RTUINTPTR)0, pfnGetImport, pvUser);
553	}
554
555
556	/** @copydoc RTLDROPS::Relocate */
557	static DECLCALLBACK(int) RTLDRELF_NAME(Relocate)(PRTLDRMODINTERNAL pMod, void *pvBits, RTUINTPTR NewBaseAddress,
558	RTUINTPTR OldBaseAddress, PFNRTLDRIMPORT pfnGetImport, void *pvUser)
559	{
560	PRTLDRMODELF pModElf = (PRTLDRMODELF)pMod;
561	NOREF(OldBaseAddress);
562
563	/*
564	* Validate the input.
565	*/
566	Elf_Addr BaseAddr = (Elf_Addr)NewBaseAddress;
567	AssertMsgReturn((RTUINTPTR)BaseAddr == NewBaseAddress, ("#RTptr", NewBaseAddress), VERR_IMAGE_BASE_TOO_HIGH);
568
569	/*
570	* Map the image bits if not already done and setup pointer into it.
571	*/
572	int rc = RTLDRELF_NAME(MapBits)(pModElf, true);
573	if (RT_FAILURE(rc))
574	return rc;
575
576	/*
577	* Iterate the sections looking for interesting SHT_REL[A] sections.
578	* SHT_REL[A] sections have the section index of the section they contain fixups
579	* for in the sh_info member.
580	*/
581	const Elf_Shdr *paShdrs = pModElf->paShdrs;
582	#ifdef LOG_ENABLED
583	const char *pszLogName = pModElf->pReader->pfnLogName(pModElf->pReader);
584	Log2(("rtLdrElf: %s: Fixing up image\n", pszLogName));
585	#endif
586	for (unsigned iShdr = 0; iShdr < pModElf->Ehdr.e_shnum; iShdr++)
587	{
588	const Elf_Shdr *pShdrRel = &paShdrs[iShdr];
589
590	/*
591	* Skip sections without interest to us.
592	*/
593	#if ELF_MODE == 32
594	if (pShdrRel->sh_type != SHT_REL)
595	#else
596	if (pShdrRel->sh_type != SHT_RELA)
597	#endif
598	continue;
599	if (pShdrRel->sh_info >= pModElf->Ehdr.e_shnum)
600	continue;
601	const Elf_Shdr pShdr = &paShdrs[pShdrRel->sh_info]; / the section to fixup. */
602	if (!(pShdr->sh_flags & SHF_ALLOC))
603	continue;
604
605	/*
606	* Relocate the section.
607	*/
608	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",
609	pszLogName, (int)pShdrRel->sh_info, ELF_STR(pModElf, pShdr->sh_name), (int)pShdr->sh_info, (int)pShdr->sh_link,
610	iShdr, ELF_STR(pModElf, pShdrRel->sh_name), (int)pShdrRel->sh_info, (int)pShdrRel->sh_link));
611
612	/** @todo Make RelocateSection a function pointer so we can select the one corresponding to the machine when opening the image. */
613	rc = RTLDRELF_NAME(RelocateSection)(pModElf, BaseAddr, pfnGetImport, pvUser,
614	pShdr->sh_addr,
615	pShdr->sh_size,
616	(const uint8_t *)pModElf->pvBits + pShdr->sh_offset,
617	(uint8_t *)pvBits + pShdr->sh_addr,
618	(const uint8_t *)pModElf->pvBits + pShdrRel->sh_offset,
619	pShdrRel->sh_size);
620	if (RT_FAILURE(rc))
621	return rc;
622	}
623	return VINF_SUCCESS;
624	}
625
626
627	/** @copydoc RTLDROPS::pfnGetSymbolEx */
628	static DECLCALLBACK(int) RTLDRELF_NAME(GetSymbolEx)(PRTLDRMODINTERNAL pMod, const void pvBits, RTUINTPTR BaseAddress, const char pszSymbol, RTUINTPTR *pValue)
629	{
630	PRTLDRMODELF pModElf = (PRTLDRMODELF)pMod;
631	NOREF(pvBits);
632
633	/*
634	* Validate the input.
635	*/
636	Elf_Addr BaseAddr = (Elf_Addr)BaseAddress;
637	AssertMsgReturn((RTUINTPTR)BaseAddr == BaseAddress, ("#RTptr", BaseAddress), VERR_IMAGE_BASE_TOO_HIGH);
638
639	/*
640	* Map the image bits if not already done and setup pointer into it.
641	*/
642	int rc = RTLDRELF_NAME(MapBits)(pModElf, true);
643	if (RT_FAILURE(rc))
644	return rc;
645
646	/*
647	* Calc all kinds of pointers before we start iterating the symbol table.
648	*/
649	const char *pStr = pModElf->pStr;
650	const Elf_Sym *paSyms = pModElf->paSyms;
651	unsigned cSyms = pModElf->cSyms;
652	for (unsigned iSym = 1; iSym < cSyms; iSym++)
653	{
654	/* Undefined symbols are not exports, they are imports. */
655	if ( paSyms[iSym].st_shndx != SHN_UNDEF
656	&& ( ELF_ST_BIND(paSyms[iSym].st_info) == STB_GLOBAL
657	\|\| ELF_ST_BIND(paSyms[iSym].st_info) == STB_WEAK))
658	{
659	/* Validate the name string and try match with it. */
660	if (paSyms[iSym].st_name < pModElf->cbStr)
661	{
662	if (!strcmp(pszSymbol, pStr + paSyms[iSym].st_name))
663	{
664	/* matched! */
665	Elf_Addr Value;
666	if (paSyms[iSym].st_shndx == SHN_ABS)
667	/* absolute symbols are not subject to any relocation. */
668	Value = paSyms[iSym].st_value;
669	else if (paSyms[iSym].st_shndx < pModElf->Ehdr.e_shnum)
670	/* relative to the section. */
671	Value = BaseAddr + paSyms[iSym].st_value + pModElf->paShdrs[paSyms[iSym].st_shndx].sh_addr;
672	else
673	{
674	AssertMsgFailed(("Arg. paSyms[iSym].st_shndx=%d\n", paSyms[iSym].st_shndx));
675	return VERR_BAD_EXE_FORMAT;
676	}
677	AssertMsgReturn(Value == (RTUINTPTR)Value, (FMT_ELF_ADDR "\n", Value), VERR_SYMBOL_VALUE_TOO_BIG);
678	*pValue = (RTUINTPTR)Value;
679	return VINF_SUCCESS;
680	}
681	}
682	else
683	{
684	AssertMsgFailed(("String outside string table! iSym=%d paSyms[iSym].st_name=%#x\n", iSym, paSyms[iSym].st_name));
685	return VERR_LDRELF_INVALID_SYMBOL_NAME_OFFSET;
686	}
687	}
688	}
689
690	return VERR_SYMBOL_NOT_FOUND;
691	}
692
693
694	/** @copydoc RTLDROPS::pfnEnumDbgInfo */
695	static DECLCALLBACK(int) RTLDRELF_NAME(EnumDbgInfo)(PRTLDRMODINTERNAL pMod, const void *pvBits,
696	PFNRTLDRENUMDBG pfnCallback, void *pvUser)
697	{
698	PRTLDRMODELF pModElf = (PRTLDRMODELF)pMod;
699	NOREF(pvBits);
700
701	return VERR_NOT_IMPLEMENTED; NOREF(pModElf); NOREF(pfnCallback); NOREF(pvUser);
702	}
703
704
705	/** @copydoc RTLDROPS::pfnEnumSegments. */
706	static DECLCALLBACK(int) RTLDRELF_NAME(EnumSegments)(PRTLDRMODINTERNAL pMod, PFNRTLDRENUMSEGS pfnCallback, void *pvUser)
707	{
708	PRTLDRMODELF pModElf = (PRTLDRMODELF)pMod;
709
710	return VERR_NOT_IMPLEMENTED; NOREF(pModElf); NOREF(pfnCallback); NOREF(pvUser);
711	}
712
713
714	/** @copydoc RTLDROPS::pfnLinkAddressToSegOffset. */
715	static DECLCALLBACK(int) RTLDRELF_NAME(LinkAddressToSegOffset)(PRTLDRMODINTERNAL pMod, RTLDRADDR LinkAddress,
716	uint32_t *piSeg, PRTLDRADDR poffSeg)
717	{
718	PRTLDRMODELF pModElf = (PRTLDRMODELF)pMod;
719
720	return VERR_NOT_IMPLEMENTED; NOREF(pModElf); NOREF(LinkAddress); NOREF(piSeg); NOREF(poffSeg);
721	}
722
723
724	/** @copydoc RTLDROPS::pfnLinkAddressToRva. */
725	static DECLCALLBACK(int) RTLDRELF_NAME(LinkAddressToRva)(PRTLDRMODINTERNAL pMod, RTLDRADDR LinkAddress, PRTLDRADDR pRva)
726	{
727	PRTLDRMODELF pModElf = (PRTLDRMODELF)pMod;
728
729	return VERR_NOT_IMPLEMENTED; NOREF(pModElf); NOREF(LinkAddress); NOREF(pRva);
730	}
731
732
733	/** @copydoc RTLDROPS::pfnSegOffsetToRva. */
734	static DECLCALLBACK(int) RTLDRELF_NAME(SegOffsetToRva)(PRTLDRMODINTERNAL pMod, uint32_t iSeg, RTLDRADDR offSeg,
735	PRTLDRADDR pRva)
736	{
737	PRTLDRMODELF pModElf = (PRTLDRMODELF)pMod;
738
739	return VERR_NOT_IMPLEMENTED; NOREF(pModElf); NOREF(iSeg); NOREF(offSeg); NOREF(pRva);
740	}
741
742
743	/** @copydoc RTLDROPS::pfnRvaToSegOffset. */
744	static DECLCALLBACK(int) RTLDRELF_NAME(RvaToSegOffset)(PRTLDRMODINTERNAL pMod, RTLDRADDR Rva,
745	uint32_t *piSeg, PRTLDRADDR poffSeg)
746	{
747	PRTLDRMODELF pModElf = (PRTLDRMODELF)pMod;
748
749	return VERR_NOT_IMPLEMENTED; NOREF(pModElf); NOREF(Rva); NOREF(piSeg); NOREF(poffSeg);
750	}
751
752
753
754	/**
755	* The ELF module operations.
756	*/
757	static RTLDROPS RTLDRELF_MID(s_rtldrElf,Ops) =
758	{
759	#if ELF_MODE == 32
760	"elf32",
761	#elif ELF_MODE == 64
762	"elf64",
763	#endif
764	RTLDRELF_NAME(Close),
765	NULL, /* Get Symbol */
766	RTLDRELF_NAME(Done),
767	RTLDRELF_NAME(EnumSymbols),
768	/* ext: */
769	RTLDRELF_NAME(GetImageSize),
770	RTLDRELF_NAME(GetBits),
771	RTLDRELF_NAME(Relocate),
772	RTLDRELF_NAME(GetSymbolEx),
773	RTLDRELF_NAME(EnumDbgInfo),
774	RTLDRELF_NAME(EnumSegments),
775	RTLDRELF_NAME(LinkAddressToSegOffset),
776	RTLDRELF_NAME(LinkAddressToRva),
777	RTLDRELF_NAME(SegOffsetToRva),
778	RTLDRELF_NAME(RvaToSegOffset),
779	42
780	};
781
782
783
784	/**
785	* Validates the ELF header.
786	*
787	* @returns iprt status code.
788	* @param pEhdr Pointer to the ELF header.
789	* @param pszLogName The log name.
790	* @param cbRawImage The size of the raw image.
791	*/
792	static int RTLDRELF_NAME(ValidateElfHeader)(const Elf_Ehdr pEhdr, const char pszLogName, uint64_t cbRawImage,
793	PRTLDRARCH penmArch)
794	{
795	Log3(("RTLdrELF: e_ident: %.*Rhxs\n"
796	"RTLdrELF: e_type: " FMT_ELF_HALF "\n"
797	"RTLdrELF: e_version: " FMT_ELF_HALF "\n"
798	"RTLdrELF: e_entry: " FMT_ELF_ADDR "\n"
799	"RTLdrELF: e_phoff: " FMT_ELF_OFF "\n"
800	"RTLdrELF: e_shoff: " FMT_ELF_OFF "\n"
801	"RTLdrELF: e_flags: " FMT_ELF_WORD "\n"
802	"RTLdrELF: e_ehsize: " FMT_ELF_HALF "\n"
803	"RTLdrELF: e_phentsize: " FMT_ELF_HALF "\n"
804	"RTLdrELF: e_phnum: " FMT_ELF_HALF "\n"
805	"RTLdrELF: e_shentsize: " FMT_ELF_HALF "\n"
806	"RTLdrELF: e_shnum: " FMT_ELF_HALF "\n"
807	"RTLdrELF: e_shstrndx: " FMT_ELF_HALF "\n",
808	RT_ELEMENTS(pEhdr->e_ident), &pEhdr->e_ident[0], pEhdr->e_type, pEhdr->e_version,
809	pEhdr->e_entry, pEhdr->e_phoff, pEhdr->e_shoff,pEhdr->e_flags, pEhdr->e_ehsize, pEhdr->e_phentsize,
810	pEhdr->e_phnum, pEhdr->e_shentsize, pEhdr->e_shnum, pEhdr->e_shstrndx));
811
812	if ( pEhdr->e_ident[EI_MAG0] != ELFMAG0
813	\|\| pEhdr->e_ident[EI_MAG1] != ELFMAG1
814	\|\| pEhdr->e_ident[EI_MAG2] != ELFMAG2
815	\|\| pEhdr->e_ident[EI_MAG3] != ELFMAG3
816	)
817	{
818	Log(("RTLdrELF: %s: Invalid ELF magic (%.*Rhxs)\n", pszLogName, sizeof(pEhdr->e_ident), pEhdr->e_ident)); NOREF(pszLogName);
819	return VERR_BAD_EXE_FORMAT;
820	}
821	if (pEhdr->e_ident[EI_CLASS] != RTLDRELF_SUFF(ELFCLASS))
822	{
823	Log(("RTLdrELF: %s: Invalid ELF class (%.*Rhxs)\n", pszLogName, sizeof(pEhdr->e_ident), pEhdr->e_ident));
824	return VERR_BAD_EXE_FORMAT;
825	}
826	if (pEhdr->e_ident[EI_DATA] != ELFDATA2LSB)
827	{
828	Log(("RTLdrELF: %s: ELF endian %x is unsupported\n", pEhdr->e_ident[EI_DATA]));
829	return VERR_LDRELF_ODD_ENDIAN;
830	}
831	if (pEhdr->e_version != EV_CURRENT)
832	{
833	Log(("RTLdrELF: %s: ELF version %x is unsupported\n", pEhdr->e_version));
834	return VERR_LDRELF_VERSION;
835	}
836
837	if (sizeof(Elf_Ehdr) != pEhdr->e_ehsize)
838	{
839	Log(("RTLdrELF: %s: Elf header e_ehsize is %d expected %d!\n",
840	pszLogName, pEhdr->e_ehsize, sizeof(Elf_Ehdr)));
841	return VERR_BAD_EXE_FORMAT;
842	}
843	if ( sizeof(Elf_Phdr) != pEhdr->e_phentsize
844	&& ( pEhdr->e_phnum != 0
845	\|\| pEhdr->e_type == ET_DYN))
846	{
847	Log(("RTLdrELF: %s: Elf header e_phentsize is %d expected %d!\n",
848	pszLogName, pEhdr->e_phentsize, sizeof(Elf_Phdr)));
849	return VERR_BAD_EXE_FORMAT;
850	}
851	if (sizeof(Elf_Shdr) != pEhdr->e_shentsize)
852	{
853	Log(("RTLdrELF: %s: Elf header e_shentsize is %d expected %d!\n",
854	pszLogName, pEhdr->e_shentsize, sizeof(Elf_Shdr)));
855	return VERR_BAD_EXE_FORMAT;
856	}
857
858	switch (pEhdr->e_type)
859	{
860	case ET_REL:
861	break;
862	case ET_EXEC:
863	Log(("RTLdrELF: %s: Executable images are not supported yet!\n", pszLogName));
864	return VERR_LDRELF_EXEC;
865	case ET_DYN:
866	Log(("RTLdrELF: %s: Dynamic images are not supported yet!\n", pszLogName));
867	return VERR_LDRELF_DYN;
868	default:
869	Log(("RTLdrELF: %s: image type %#x is not supported!\n", pszLogName, pEhdr->e_type));
870	return VERR_BAD_EXE_FORMAT;
871	}
872
873	switch (pEhdr->e_machine)
874	{
875	#if ELF_MODE == 32
876	case EM_386:
877	case EM_486:
878	*penmArch = RTLDRARCH_X86_32;
879	break;
880	#elif ELF_MODE == 64
881	case EM_X86_64:
882	*penmArch = RTLDRARCH_AMD64;
883	break;
884	#endif
885	default:
886	Log(("RTLdrELF: %s: machine type %u is not supported!\n", pEhdr->e_machine));
887	return VERR_LDRELF_MACHINE;
888	}
889
890	if ( pEhdr->e_phoff < pEhdr->e_ehsize
891	&& !(pEhdr->e_phoff && pEhdr->e_phnum)
892	&& pEhdr->e_phnum)
893	{
894	Log(("RTLdrELF: %s: The program headers overlap with the ELF header! e_phoff=" FMT_ELF_OFF "\n",
895	pszLogName, pEhdr->e_phoff));
896	return VERR_BAD_EXE_FORMAT;
897	}
898	if ( pEhdr->e_phoff + pEhdr->e_phnum * pEhdr->e_phentsize > cbRawImage
899	\|\| pEhdr->e_phoff + pEhdr->e_phnum * pEhdr->e_phentsize < pEhdr->e_phoff)
900	{
901	Log(("RTLdrELF: %s: The program headers extends beyond the file! e_phoff=" FMT_ELF_OFF " e_phnum=" FMT_ELF_HALF "\n",
902	pszLogName, pEhdr->e_phoff, pEhdr->e_phnum));
903	return VERR_BAD_EXE_FORMAT;
904	}
905
906
907	if ( pEhdr->e_shoff < pEhdr->e_ehsize
908	&& !(pEhdr->e_shoff && pEhdr->e_shnum))
909	{
910	Log(("RTLdrELF: %s: The section headers overlap with the ELF header! e_shoff=" FMT_ELF_OFF "\n",
911	pszLogName, pEhdr->e_shoff));
912	return VERR_BAD_EXE_FORMAT;
913	}
914	if ( pEhdr->e_shoff + pEhdr->e_shnum * pEhdr->e_shentsize > cbRawImage
915	\|\| pEhdr->e_shoff + pEhdr->e_shnum * pEhdr->e_shentsize < pEhdr->e_shoff)
916	{
917	Log(("RTLdrELF: %s: The section headers extends beyond the file! e_shoff=" FMT_ELF_OFF " e_shnum=" FMT_ELF_HALF "\n",
918	pszLogName, pEhdr->e_shoff, pEhdr->e_shnum));
919	return VERR_BAD_EXE_FORMAT;
920	}
921
922	return VINF_SUCCESS;
923	}
924
925	/**
926	* Gets the section header name.
927	*
928	* @returns pszName.
929	* @param pReader The loader reader instance.
930	* @param pEhdr The elf header.
931	* @param offName The offset of the section header name.
932	* @param pszName Where to store the name.
933	* @param cbName The size of the buffer pointed to by pszName.
934	*/
935	const char RTLDRELF_NAME(GetSHdrName)(PRTLDRMODELF pModElf, Elf_Word offName, char pszName, size_t cbName)
936	{
937	RTFOFF off = pModElf->paShdrs[pModElf->Ehdr.e_shstrndx].sh_offset + offName;
938	int rc = pModElf->pReader->pfnRead(pModElf->pReader, pszName, cbName - 1, off);
939	if (RT_FAILURE(rc))
940	{
941	/* read by for byte. */
942	for (unsigned i = 0; i < cbName; i++, off++)
943	{
944	rc = pModElf->pReader->pfnRead(pModElf->pReader, pszName + i, 1, off);
945	if (RT_FAILURE(rc))
946	{
947	pszName[i] = '\0';
948	break;
949	}
950	}
951	}
952
953	pszName[cbName - 1] = '\0';
954	return pszName;
955	}
956
957
958	/**
959	* Validates a section header.
960	*
961	* @returns iprt status code.
962	* @param pModElf Pointer to the module structure.
963	* @param iShdr The index of section header which should be validated.
964	* The section headers are found in the pModElf->paShdrs array.
965	* @param pszLogName The log name.
966	* @param cbRawImage The size of the raw image.
967	*/
968	static int RTLDRELF_NAME(ValidateSectionHeader)(PRTLDRMODELF pModElf, unsigned iShdr, const char *pszLogName, RTFOFF cbRawImage)
969	{
970	const Elf_Shdr *pShdr = &pModElf->paShdrs[iShdr];
971	char szSectionName[80]; NOREF(szSectionName);
972	Log3(("RTLdrELF: Section Header #%d:\n"
973	"RTLdrELF: sh_name: " FMT_ELF_WORD " - %s\n"
974	"RTLdrELF: sh_type: " FMT_ELF_WORD " (%s)\n"
975	"RTLdrELF: sh_flags: " FMT_ELF_XWORD "\n"
976	"RTLdrELF: sh_addr: " FMT_ELF_ADDR "\n"
977	"RTLdrELF: sh_offset: " FMT_ELF_OFF "\n"
978	"RTLdrELF: sh_size: " FMT_ELF_XWORD "\n"
979	"RTLdrELF: sh_link: " FMT_ELF_WORD "\n"
980	"RTLdrELF: sh_info: " FMT_ELF_WORD "\n"
981	"RTLdrELF: sh_addralign: " FMT_ELF_XWORD "\n"
982	"RTLdrELF: sh_entsize: " FMT_ELF_XWORD "\n",
983	iShdr,
984	pShdr->sh_name, RTLDRELF_NAME(GetSHdrName)(pModElf, pShdr->sh_name, szSectionName, sizeof(szSectionName)),
985	pShdr->sh_type, rtldrElfGetShdrType(pShdr->sh_type), pShdr->sh_flags, pShdr->sh_addr,
986	pShdr->sh_offset, pShdr->sh_size, pShdr->sh_link, pShdr->sh_info, pShdr->sh_addralign,
987	pShdr->sh_entsize));
988
989	if (pShdr->sh_link >= pModElf->Ehdr.e_shnum)
990	{
991	Log(("RTLdrELF: %s: Shdr #%d: sh_link (%d) is beyond the end of the section table (%d)!\n",
992	pszLogName, iShdr, pShdr->sh_link, pModElf->Ehdr.e_shnum)); NOREF(pszLogName);
993	return VERR_BAD_EXE_FORMAT;
994	}
995
996	switch (pShdr->sh_type)
997	{
998	/** @todo find specs and check up which sh_info fields indicates section table entries */
999	case 12301230:
1000	if (pShdr->sh_info >= pModElf->Ehdr.e_shnum)
1001	{
1002	Log(("RTLdrELF: %s: Shdr #%d: sh_info (%d) is beyond the end of the section table (%d)!\n",
1003	pszLogName, iShdr, pShdr->sh_link, pModElf->Ehdr.e_shnum));
1004	return VERR_BAD_EXE_FORMAT;
1005	}
1006	break;
1007
1008	case SHT_NULL:
1009	case SHT_PROGBITS:
1010	case SHT_SYMTAB:
1011	case SHT_STRTAB:
1012	case SHT_RELA:
1013	case SHT_HASH:
1014	case SHT_DYNAMIC:
1015	case SHT_NOTE:
1016	case SHT_NOBITS:
1017	case SHT_REL:
1018	case SHT_SHLIB:
1019	case SHT_DYNSYM:
1020	/*
1021	* For these types sh_info doesn't have any special meaning, or anything which
1022	* we need/can validate now.
1023	*/
1024	break;
1025
1026
1027	default:
1028	Log(("RTLdrELF: %s: Warning, unknown type %d!\n", pszLogName, pShdr->sh_type));
1029	break;
1030	}
1031
1032	if ( pShdr->sh_type != SHT_NOBITS
1033	&& pShdr->sh_size)
1034	{
1035	RTFOFF offEnd = pShdr->sh_offset + pShdr->sh_size;
1036	if ( offEnd > cbRawImage
1037	\|\| offEnd < (RTFOFF)pShdr->sh_offset)
1038	{
1039	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",
1040	pszLogName, iShdr, pShdr->sh_offset, pShdr->sh_size, offEnd, cbRawImage));
1041	return VERR_BAD_EXE_FORMAT;
1042	}
1043	if (pShdr->sh_offset < sizeof(Elf_Ehdr))
1044	{
1045	Log(("RTLdrELF: %s: Shdr #%d: sh_offset (" FMT_ELF_OFF ") + sh_size (" FMT_ELF_XWORD ") is starting in the ELF header!\n",
1046	pszLogName, iShdr, pShdr->sh_offset, pShdr->sh_size, cbRawImage));
1047	return VERR_BAD_EXE_FORMAT;
1048	}
1049	}
1050
1051	return VINF_SUCCESS;
1052	}
1053
1054
1055
1056	/**
1057	* Opens an ELF image, fixed bitness.
1058	*
1059	* @returns iprt status code.
1060	* @param pReader The loader reader instance which will provide the raw image bits.
1061	* @param fFlags Reserved, MBZ.
1062	* @param enmArch Architecture specifier.
1063	* @param phLdrMod Where to store the handle.
1064	*/
1065	static int RTLDRELF_NAME(Open)(PRTLDRREADER pReader, uint32_t fFlags, RTLDRARCH enmArch, PRTLDRMOD phLdrMod)
1066	{
1067	const char *pszLogName = pReader->pfnLogName(pReader);
1068	RTFOFF cbRawImage = pReader->pfnSize(pReader);
1069	AssertReturn(!fFlags, VERR_INVALID_PARAMETER);
1070
1071	/*
1072	* Create the loader module instance.
1073	*/
1074	PRTLDRMODELF pModElf = (PRTLDRMODELF)RTMemAllocZ(sizeof(*pModElf));
1075	if (!pModElf)
1076	return VERR_NO_MEMORY;
1077
1078	pModElf->Core.u32Magic = RTLDRMOD_MAGIC;
1079	pModElf->Core.eState = LDR_STATE_INVALID;
1080	pModElf->pReader = pReader;
1081	//pModElf->pvBits = NULL;
1082	//pModElf->Ehdr = {0};
1083	//pModElf->paShdrs = NULL;
1084	//pModElf->paSyms = NULL;
1085	pModElf->iSymSh = ~0U;
1086	pModElf->cSyms = 0;
1087	pModElf->iStrSh = ~0U;
1088	pModElf->cbStr = 0;
1089	pModElf->cbImage = 0;
1090	//pModElf->pStr = NULL;
1091
1092	/*
1093	* Read and validate the ELF header and match up the CPU architecture.
1094	*/
1095	int rc = pReader->pfnRead(pReader, &pModElf->Ehdr, sizeof(pModElf->Ehdr), 0);
1096	if (RT_SUCCESS(rc))
1097	{
1098	RTLDRARCH enmArchImage = RTLDRARCH_INVALID; /* shut up gcc */
1099	rc = RTLDRELF_NAME(ValidateElfHeader)(&pModElf->Ehdr, pszLogName, cbRawImage, &enmArchImage);
1100	if (RT_SUCCESS(rc))
1101	{
1102	if ( enmArch != RTLDRARCH_WHATEVER
1103	&& enmArch != enmArchImage)
1104	rc = VERR_LDR_ARCH_MISMATCH;
1105	}
1106	}
1107	if (RT_SUCCESS(rc))
1108	{
1109	/*
1110	* Read the section headers.
1111	*/
1112	Elf_Shdr paShdrs = (Elf_Shdr )RTMemAlloc(pModElf->Ehdr.e_shnum * sizeof(Elf_Shdr));
1113	if (paShdrs)
1114	{
1115	pModElf->paShdrs = paShdrs;
1116	rc = pReader->pfnRead(pReader, paShdrs, pModElf->Ehdr.e_shnum * sizeof(Elf_Shdr),
1117	pModElf->Ehdr.e_shoff);
1118	if (RT_SUCCESS(rc))
1119	{
1120	/*
1121	* Validate the section headers, allocate memory for the sections (determine the image size),
1122	* and find relevant sections.
1123	*/
1124	for (unsigned i = 0; i < pModElf->Ehdr.e_shnum; i++)
1125	{
1126	rc = RTLDRELF_NAME(ValidateSectionHeader)(pModElf, i, pszLogName, cbRawImage);
1127	if (RT_FAILURE(rc))
1128	break;
1129
1130	/* Allocate memory addresses for the section. */
1131	if (paShdrs[i].sh_flags & SHF_ALLOC)
1132	{
1133	paShdrs[i].sh_addr = paShdrs[i].sh_addralign
1134	? RT_ALIGN_T(pModElf->cbImage, paShdrs[i].sh_addralign, Elf_Addr)
1135	: (Elf_Addr)pModElf->cbImage;
1136	pModElf->cbImage = (size_t)paShdrs[i].sh_addr + (size_t)paShdrs[i].sh_size;
1137	AssertMsgReturn(pModElf->cbImage == paShdrs[i].sh_addr + paShdrs[i].sh_size,
1138	(FMT_ELF_ADDR "\n", paShdrs[i].sh_addr + paShdrs[i].sh_size),
1139	VERR_IMAGE_TOO_BIG);
1140	Log2(("RTLdrElf: %s: Assigned " FMT_ELF_ADDR " to section #%d\n", pszLogName, paShdrs[i].sh_addr, i));
1141	}
1142
1143	/* We're looking for symbol tables. */
1144	if (paShdrs[i].sh_type == SHT_SYMTAB)
1145	{
1146	if (pModElf->iSymSh != ~0U)
1147	{
1148	Log(("RTLdrElf: %s: Multiple symbol tabs! iSymSh=%d i=%d\n", pszLogName, pModElf->iSymSh, i));
1149	rc = VERR_LDRELF_MULTIPLE_SYMTABS;
1150	break;
1151	}
1152	pModElf->iSymSh = i;
1153	pModElf->cSyms = (unsigned)(paShdrs[i].sh_size / sizeof(Elf_Sym));
1154	AssertReturn(pModElf->cSyms == paShdrs[i].sh_size / sizeof(Elf_Sym), VERR_IMAGE_TOO_BIG);
1155	pModElf->iStrSh = paShdrs[i].sh_link;
1156	pModElf->cbStr = (unsigned)paShdrs[pModElf->iStrSh].sh_size;
1157	AssertReturn(pModElf->cbStr == paShdrs[pModElf->iStrSh].sh_size, VERR_IMAGE_TOO_BIG);
1158	}
1159	} /* for each section header */
1160
1161	Log2(("RTLdrElf: iSymSh=%u cSyms=%u iStrSh=%u cbStr=%u rc=%Rrc cbImage=%#zx\n",
1162	pModElf->iSymSh, pModElf->cSyms, pModElf->iStrSh, pModElf->cbStr, rc, pModElf->cbImage));
1163
1164	/*
1165	* Are the section headers fine?
1166	* We require there to be symbol & string tables (at least for the time being).
1167	*/
1168	if ( pModElf->iSymSh == ~0U
1169	\|\| pModElf->iStrSh == ~0U)
1170	rc = VERR_LDRELF_NO_SYMBOL_OR_NO_STRING_TABS;
1171	if (RT_SUCCESS(rc))
1172	{
1173	pModElf->Core.pOps = &RTLDRELF_MID(s_rtldrElf,Ops);
1174	pModElf->Core.eState = LDR_STATE_OPENED;
1175	*phLdrMod = &pModElf->Core;
1176
1177	LogFlow(("%s: %s: returns VINF_SUCCESS phLdrMod=%p\n", __FUNCTION__, pszLogName, phLdrMod));
1178	return VINF_SUCCESS;
1179	}
1180	}
1181
1182	RTMemFree(paShdrs);
1183	}
1184	else
1185	rc = VERR_NO_MEMORY;
1186	}
1187
1188	RTMemFree(pModElf);
1189	LogFlow(("%s: returns %Rrc\n", __FUNCTION__, rc));
1190	return rc;
1191	}
1192
1193
1194
1195
1196	/*******************************************************************************
1197	* Cleanup Constants And Macros *
1198	*******************************************************************************/
1199	#undef RTLDRELF_NAME
1200	#undef RTLDRELF_SUFF
1201	#undef RTLDRELF_MID
1202
1203	#undef FMT_ELF_ADDR
1204	#undef FMT_ELF_HALF
1205	#undef FMT_ELF_SHALF
1206	#undef FMT_ELF_OFF
1207	#undef FMT_ELF_SIZE
1208	#undef FMT_ELF_SWORD
1209	#undef FMT_ELF_WORD
1210	#undef FMT_ELF_XWORD
1211	#undef FMT_ELF_SXWORD
1212
1213	#undef Elf_Ehdr
1214	#undef Elf_Phdr
1215	#undef Elf_Shdr
1216	#undef Elf_Sym
1217	#undef Elf_Rel
1218	#undef Elf_Rela
1219	#undef Elf_Reloc
1220	#undef Elf_Nhdr
1221	#undef Elf_Dyn
1222
1223	#undef Elf_Addr
1224	#undef Elf_Half
1225	#undef Elf_Off
1226	#undef Elf_Size
1227	#undef Elf_Sword
1228	#undef Elf_Word
1229
1230	#undef RTLDRMODELF
1231	#undef PRTLDRMODELF
1232
1233	#undef ELF_R_SYM
1234	#undef ELF_R_TYPE
1235	#undef ELF_R_INFO
1236
1237	#undef ELF_ST_BIND
1238

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source: vbox/trunk/src/VBox/Runtime/common/ldr/ldrELFRelocatable.cpp.h@ 39436

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