ldrELFRelocatable.cpp.h@ 3282

Last change on this file since 3282 was 3022, checked in by vboxsync, 18 years ago
Check that there is a symbol table in the ELF relocatable image we're loading. (or we'll crash later during relocalation)
Property svn:eol-style set to `native` Property svn:keywords set to `Id`
File size: 42.4 KB

Line
1	/* $Id: ldrELFRelocatable.cpp.h 3022 2007-06-04 12:32:29Z vboxsync $ */
2	/** @file
3	* innotek Portable Runtime - Binary Image Loader, Template for ELF Relocatable Images.
4	*/
5
6	/*
7	* Copyright (C) 2006-2007 innotek GmbH
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 as published by the Free Software Foundation,
13	* in version 2 as it comes in the "COPYING" file of the VirtualBox OSE
14	* distribution. VirtualBox OSE is distributed in the hope that it will
15	* be useful, but WITHOUT ANY WARRANTY of any kind.
16	*
17	* If you received this file as part of a commercial VirtualBox
18	* distribution, then only the terms of your commercial VirtualBox
19	* license agreement apply instead of the previous paragraph.
20	*/
21
22	/*******************************************************************************
23	* Defined Constants And Macros *
24	*******************************************************************************/
25	#if ELF_MODE == 32
26	#define RTLDRELF_NAME(name) rtldrELF32##name
27	#define RTLDRELF_SUFF(name) name##32
28	#define RTLDRELF_MID(pre,suff) pre##32##suff
29	#define FMT_ELF_ADDR "%08RX32"
30	#define FMT_ELF_HALF "%04RX16"
31	#define FMT_ELF_OFF "%08RX32"
32	#define FMT_ELF_SIZE "%08RX32"
33	#define FMT_ELF_SWORD "%RI32"
34	#define FMT_ELF_WORD "%08RX32"
35	#define FMT_ELF_XWORD "%08RX32"
36	#define FMT_ELF_SXWORD "%RI32"
37
38	#elif ELF_MODE == 64
39	#define RTLDRELF_NAME(name) rtldrELF64##name
40	#define RTLDRELF_SUFF(name) name##64
41	#define RTLDRELF_MID(pre,suff) pre##64##suff
42	#define FMT_ELF_ADDR "%016RX64"
43	#define FMT_ELF_HALF "%04RX16"
44	#define FMT_ELF_SHALF "%RI16"
45	#define FMT_ELF_OFF "%016RX64"
46	#define FMT_ELF_SIZE "%016RX64"
47	#define FMT_ELF_SWORD "%RI32"
48	#define FMT_ELF_WORD "%08RX32"
49	#define FMT_ELF_XWORD "%016RX64"
50	#define FMT_ELF_SXWORD "%RI64"
51	#endif
52
53	#define Elf_Ehdr RTLDRELF_MID(Elf,_Ehdr)
54	#define Elf_Phdr RTLDRELF_MID(Elf,_Phdr)
55	#define Elf_Shdr RTLDRELF_MID(Elf,_Shdr)
56	#define Elf_Sym RTLDRELF_MID(Elf,_Sym)
57	#define Elf_Rel RTLDRELF_MID(Elf,_Rel)
58	#define Elf_Rela RTLDRELF_MID(Elf,_Rela)
59	#define Elf_Nhdr RTLDRELF_MID(Elf,_Nhdr)
60	#define Elf_Dyn RTLDRELF_MID(Elf,_Dyn)
61	#define Elf_Addr RTLDRELF_MID(Elf,_Addr)
62	#define Elf_Half RTLDRELF_MID(Elf,_Half)
63	#define Elf_Off RTLDRELF_MID(Elf,_Off)
64	#define Elf_Size RTLDRELF_MID(Elf,_Size)
65	#define Elf_Sword RTLDRELF_MID(Elf,_Sword)
66	#define Elf_Word RTLDRELF_MID(Elf,_Word)
67
68	#define RTLDRMODELF RTLDRELF_MID(RTLDRMODELF,)
69	#define PRTLDRMODELF RTLDRELF_MID(PRTLDRMODELF,)
70
71	#define ELF_R_SYM(info) RTLDRELF_MID(ELF,_R_SYM)(info)
72	#define ELF_R_TYPE(info) RTLDRELF_MID(ELF,_R_TYPE)(info)
73	#define ELF_R_INFO(sym, type) RTLDRELF_MID(ELF,_R_INFO)(sym, type)
74
75	#define ELF_ST_BIND(info) RTLDRELF_MID(ELF,_ST_BIND)(info)
76
77
78
79	/*******************************************************************************
80	* Structures and Typedefs *
81	*******************************************************************************/
82	/**
83	* The ELF loader structure.
84	*/
85	typedef struct RTLDRMODELF
86	{
87	/** Core module structure. */
88	RTLDRMODINTERNAL Core;
89	/** Pointer to the reader instance. */
90	PRTLDRREADER pReader;
91	/** Pointer to readonly mapping of the image bits.
92	* This mapping is provided by the pReader. */
93	const void *pvBits;
94
95	/** The ELF header. */
96	Elf_Ehdr Ehdr;
97	/** Pointer to our copy of the section headers.
98	* The virtual addresses in this array is the 0 based assignments we've given the image.
99	* Not valid if the image is DONE. */
100	Elf_Shdr *paShdrs;
101	/** The size of the loaded image. */
102	size_t cbImage;
103
104	/** The symbol section index. */
105	unsigned iSymSh;
106	/** Number of symbols in the table. */
107	unsigned cSyms;
108	/** Pointer to symbol table within RTLDRMODELF::pvBits. */
109	const Elf_Sym *paSyms;
110
111	/** The string section index. */
112	unsigned iStrSh;
113	/** Size of the string table. */
114	unsigned cbStr;
115	/** Pointer to string table within RTLDRMODELF::pvBits. */
116	const char *pStr;
117	} RTLDRMODELF, *PRTLDRMODELF;
118
119
120	/**
121	* Maps the image bits into memory and resolve pointers into it.
122	*
123	* @returns iprt status code.
124	* @param pModElf The ELF loader module instance data.
125	* @param fNeedsBits Set if we actually need the pvBits member.
126	* If we don't, we can simply read the string and symbol sections, thus saving memory.
127	*/
128	static int RTLDRELF_NAME(MapBits)(PRTLDRMODELF pModElf, bool fNeedsBits)
129	{
130	NOREF(fNeedsBits);
131	if (pModElf->pvBits)
132	return VINF_SUCCESS;
133	int rc = pModElf->pReader->pfnMap(pModElf->pReader, &pModElf->pvBits);
134	if (RT_SUCCESS(rc))
135	{
136	const uint8_t pu8 = (const uint8_t )pModElf->pvBits;
137	pModElf->paSyms = (const Elf_Sym *)(pu8 + pModElf->paShdrs[pModElf->iSymSh].sh_offset);
138	pModElf->pStr = (const char *)(pu8 + pModElf->paShdrs[pModElf->iStrSh].sh_offset);
139	}
140	return rc;
141	}
142
143
144	/**
145	* Get the symbol and symbol value.
146	*
147	* @returns iprt status code.
148	* @param pModElf The ELF loader module instance data.
149	* @param BaseAddr The base address which the module is being fixedup to.
150	* @param pfnGetImport The callback function to use to resolve imports (aka unresolved externals).
151	* @param pvUser User argument to pass to the callback.
152	* @param iSym The symbol to get.
153	* @param ppSym Where to store the symbol pointer on success. (read only)
154	* @param pSymValue Where to store the symbol value on success.
155	*/
156	static int RTLDRELF_NAME(Symbol)(PRTLDRMODELF pModElf, Elf_Addr BaseAddr, PFNRTLDRIMPORT pfnGetImport, void *pvUser,
157	Elf_Size iSym, const Elf_Sym *ppSym, Elf_Addr pSymValue)
158	{
159	/*
160	* Validate and find the symbol.
161	*/
162	if (iSym >= pModElf->cSyms)
163	{
164	AssertMsgFailed(("iSym=%d is an invalid symbol index!\n", iSym));
165	return VERR_LDRELF_INVALID_SYMBOL_INDEX;
166	}
167	const Elf_Sym *pSym = &pModElf->paSyms[iSym];
168	*ppSym = pSym;
169
170	if (pSym->st_name >= pModElf->cbStr)
171	{
172	AssertMsgFailed(("iSym=%d st_name=%d str sh_size=%d\n", iSym, pSym->st_name, pModElf->cbStr));
173	return VERR_LDRELF_INVALID_SYMBOL_NAME_OFFSET;
174	}
175	const char *pszName = ELF_STR(pModElf, pSym->st_name);
176
177	/*
178	* Determin the symbol value.
179	*
180	* Symbols needs different treatment depending on which section their are in.
181	* Undefined and absolute symbols goes into special non-existing sections.
182	*/
183	switch (pSym->st_shndx)
184	{
185	/*
186	* Undefined symbol, needs resolving.
187	*
188	* Since ELF has no generic concept of importing from specific module (the OS/2 ELF format
189	* has but that's a OS extension and only applies to programs and dlls), we'll have to ask
190	* the resolver callback to do a global search.
191	*/
192	case SHN_UNDEF:
193	{
194	/* Try to resolve the symbol. */
195	RTUINTPTR Value;
196	int rc = pfnGetImport(&pModElf->Core, "", pszName, ~0, &Value, pvUser);
197	if (RT_FAILURE(rc))
198	{
199	AssertMsgFailed(("Failed to resolve '%s' rc=%Rrc\n", pszName, rc));
200	return rc;
201	}
202	*pSymValue = (Elf_Addr)Value;
203	if ((RTUINTPTR)*pSymValue != Value)
204	{
205	AssertMsgFailed(("Symbol value overflowed! '%s'\n", pszName));
206	return VERR_SYMBOL_VALUE_TOO_BIG;
207	}
208
209	Log2(("rtldrELF: #%-3d - UNDEF " FMT_ELF_ADDR " '%s'\n", iSym, *pSymValue, pszName));
210	break;
211	}
212
213	/*
214	* Absolute symbols needs no fixing since they are, well, absolute.
215	*/
216	case SHN_ABS:
217	*pSymValue = pSym->st_value;
218	Log2(("rtldrELF: #%-3d - ABS " FMT_ELF_ADDR " '%s'\n", iSym, *pSymValue, pszName));
219	break;
220
221	/*
222	* All other symbols are adressed relative to their section and need to be fixed up.
223	*/
224	default:
225	if (pSym->st_shndx >= pModElf->Ehdr.e_shnum)
226	{
227	/* what about common symbols? */
228	AssertMsg(pSym->st_shndx < pModElf->Ehdr.e_shnum,
229	("iSym=%d st_shndx=%d e_shnum=%d pszName=%s\n", iSym, pSym->st_shndx, pModElf->Ehdr.e_shnum, pszName));
230	return VERR_BAD_EXE_FORMAT;
231	}
232	*pSymValue = pSym->st_value + pModElf->paShdrs[pSym->st_shndx].sh_addr + BaseAddr;
233	Log2(("rtldrELF: #%-3d - %5d " FMT_ELF_ADDR " '%s'\n", iSym, pSym->st_shndx, *pSymValue, pszName));
234	break;
235	}
236
237	return VINF_SUCCESS;
238	}
239
240
241	/**
242	* Applies the fixups for a sections.
243	*
244	* @returns iprt status code.
245	* @param pModElf The ELF loader module instance data.
246	* @param BaseAddr The base address which the module is being fixedup to.
247	* @param pfnGetImport The callback function to use to resolve imports (aka unresolved externals).
248	* @param pvUser User argument to pass to the callback.
249	* @param SecAddr The section address. This is the address the relocations are relative to.
250	* @param cbSec The section size. The relocations must be inside this.
251	* @param pu8SecBaseR Where we read section bits from.
252	* @param pu8SecBaseW Where we write section bits to.
253	* @param pvRelocs Pointer to where we read the relocations from.
254	* @param cbRelocs Size of the relocations.
255	*/
256	static int RTLDRELF_NAME(RelocateSection)(PRTLDRMODELF pModElf, Elf_Addr BaseAddr, PFNRTLDRIMPORT pfnGetImport, void *pvUser,
257	const Elf_Addr SecAddr, Elf_Size cbSec, const uint8_t pu8SecBaseR, uint8_t pu8SecBaseW,
258	const void *pvRelocs, Elf_Size cbRelocs)
259	{
260	/*
261	* Iterate the relocations.
262	* The relocations are stored in an array of Elf32_Rel records and covers the entire relocation section.
263	*/
264	const Elf_Reloc paRels = (const Elf_Reloc )pvRelocs;
265	const unsigned iRelMax = (unsigned)(cbRelocs / sizeof(paRels[0]));
266	AssertMsgReturn(iRelMax == cbRelocs / sizeof(paRels[0]), (FMT_ELF_SIZE "\n", cbRelocs / sizeof(paRels[0])), VERR_IMAGE_TOO_BIG);
267	for (unsigned iRel = 0; iRel < iRelMax; iRel++)
268	{
269	/*
270	* Get the symbol.
271	*/
272	const Elf_Sym *pSym;
273	Elf_Addr SymValue = 0; /* shut up gcc-4 */
274	int rc = RTLDRELF_NAME(Symbol)(pModElf, BaseAddr, pfnGetImport, pvUser, ELF_R_SYM(paRels[iRel].r_info), &pSym, &SymValue);
275	if (RT_FAILURE(rc))
276	return rc;
277
278	Log3(("rtldrELF: " FMT_ELF_ADDR " %02x %06x - " FMT_ELF_ADDR " %3d %02x %s\n",
279	paRels[iRel].r_offset, ELF_R_TYPE(paRels[iRel].r_info), (unsigned)ELF_R_SYM(paRels[iRel].r_info),
280	SymValue, (unsigned)pSym->st_shndx, pSym->st_info, ELF_STR(pModElf, pSym->st_name)));
281
282	/*
283	* Apply the fixup.
284	*/
285	AssertMsgReturn(paRels[iRel].r_offset < cbSec, (FMT_ELF_ADDR " " FMT_ELF_SIZE "\n", paRels[iRel].r_offset, cbSec), VERR_LDRELF_INVALID_RELOCATION_OFFSET);
286	#if ELF_MODE == 32
287	const Elf_Addr pAddrR = (const Elf_Addr )(pu8SecBaseR + paRels[iRel].r_offset); /* Where to read the addend. */
288	#endif
289	Elf_Addr pAddrW = (Elf_Addr )(pu8SecBaseW + paRels[iRel].r_offset); /* Where to write the fixup. */
290	switch (ELF_R_TYPE(paRels[iRel].r_info))
291	{
292	#if ELF_MODE == 32
293	/*
294	* Absolute addressing.
295	*/
296	case R_386_32:
297	{
298	const Elf_Addr Value = SymValue + *pAddrR;
299	(uint32_t )pAddrW = Value;
300	Log4((FMT_ELF_ADDR": R_386_32 Value=" FMT_ELF_ADDR " SymValue=" FMT_ELF_ADDR "\n",
301	SecAddr + paRels[iRel].r_offset + BaseAddr, Value, SymValue));
302	break;
303	}
304
305	/*
306	* PC relative addressing.
307	*/
308	case R_386_PC32:
309	{
310	const Elf_Addr SourceAddr = SecAddr + paRels[iRel].r_offset + BaseAddr; /* Where the source really is. */
311	const Elf_Addr Value = SymValue + (uint32_t )pAddrR - SourceAddr;
312	(uint32_t )pAddrW = Value;
313	Log4((FMT_ELF_ADDR": R_386_PC32 Value=" FMT_ELF_ADDR " SymValue=" FMT_ELF_ADDR "\n",
314	SourceAddr, Value, SymValue));
315	break;
316	}
317
318	/* ignore */
319	case R_386_NONE:
320	break;
321
322	#elif ELF_MODE == 64
323
324	/*
325	* Absolute addressing
326	*/
327	case R_X86_64_64:
328	{
329	const Elf_Addr Value = SymValue + paRels[iRel].r_addend;
330	(uint64_t )pAddrW = Value;
331	Log4((FMT_ELF_ADDR": R_X86_64_64 Value=" FMT_ELF_ADDR " SymValue=" FMT_ELF_ADDR "\n",
332	SecAddr + paRels[iRel].r_offset + BaseAddr, Value, SymValue));
333	break;
334	}
335
336	/*
337	* Trunacated 32-bit value (zero-extendedable to the 64-bit value).
338	*/
339	case R_X86_64_32:
340	{
341	const Elf_Addr Value = SymValue + paRels[iRel].r_addend;
342	(uint32_t )pAddrW = (uint32_t)Value;
343	Log4((FMT_ELF_ADDR": R_X86_64_32 Value=" FMT_ELF_ADDR " SymValue=" FMT_ELF_ADDR "\n",
344	SecAddr + paRels[iRel].r_offset + BaseAddr, Value, SymValue));
345	AssertMsgReturn((Elf_Addr)(uint32_t )pAddrW == Value, ("Value=" FMT_ELF_ADDR "\n", Value), VERR_SYMBOL_VALUE_TOO_BIG);
346	break;
347	}
348
349	/*
350	* Truncated 32-bit value (sign-extendedable to the 64-bit value).
351	*/
352	case R_X86_64_32S:
353	{
354	const Elf_Addr Value = SymValue + paRels[iRel].r_addend;
355	(int32_t )pAddrW = (int32_t)Value;
356	Log4((FMT_ELF_ADDR": R_X86_64_32S Value=" FMT_ELF_ADDR " SymValue=" FMT_ELF_ADDR "\n",
357	SecAddr + paRels[iRel].r_offset + BaseAddr, Value, SymValue));
358	AssertMsgReturn((Elf_Addr)(int32_t )pAddrW == Value, ("Value=" FMT_ELF_ADDR "\n", Value), VERR_SYMBOL_VALUE_TOO_BIG); /** @todo check the sign-extending here. */
359	break;
360	}
361
362	/*
363	* PC relative addressing.
364	*/
365	case R_X86_64_PC32:
366	{
367	const Elf_Addr SourceAddr = SecAddr + paRels[iRel].r_offset + BaseAddr; /* Where the source really is. */
368	const Elf_Addr Value = SymValue + paRels[iRel].r_addend - SourceAddr;
369	(int32_t )pAddrW = (int32_t)Value;
370	Log4((FMT_ELF_ADDR": R_X86_64_PC32 Value=" FMT_ELF_ADDR " SymValue=" FMT_ELF_ADDR "\n",
371	SourceAddr, Value, SymValue));
372	AssertMsgReturn((Elf_Addr)(int32_t )pAddrW == Value, ("Value=" FMT_ELF_ADDR "\n", Value), VERR_SYMBOL_VALUE_TOO_BIG); /** @todo check the sign-extending here. */
373	break;
374	}
375
376	/* ignore */
377	case R_X86_64_NONE:
378	break;
379	#endif
380
381	default:
382	AssertMsgFailed(("Unknown relocation type: %d (iRel=%d iRelMax=%d)\n",
383	ELF_R_TYPE(paRels[iRel].r_info), iRel, iRelMax));
384	return VERR_LDRELF_RELOCATION_NOT_SUPPORTED;
385	}
386	}
387
388	return VINF_SUCCESS;
389	}
390
391
392
393	/** @copydoc RTLDROPS::pfnClose */
394	static DECLCALLBACK(int) RTLDRELF_NAME(Close)(PRTLDRMODINTERNAL pMod)
395	{
396	PRTLDRMODELF pModElf = (PRTLDRMODELF)pMod;
397
398	if (pModElf->paShdrs)
399	{
400	RTMemFree(pModElf->paShdrs);
401	pModElf->paShdrs = NULL;
402	}
403
404	if (pModElf->pReader)
405	{
406	pModElf->pReader->pfnDestroy(pModElf->pReader);
407	pModElf->pReader = NULL;
408	}
409
410	pModElf->pvBits = NULL;
411
412	return VINF_SUCCESS;
413	}
414
415
416	/** @copydoc RTLDROPS::Done */
417	static DECLCALLBACK(int) RTLDRELF_NAME(Done)(PRTLDRMODINTERNAL pMod)
418	{
419	//PRTLDRMODELF pModElf = (PRTLDRMODELF)pMod;
420	/** @todo Have to think more about this .... */
421	return -1;
422	}
423
424
425	/** @copydoc RTLDROPS::EnumSymbols */
426	static DECLCALLBACK(int) RTLDRELF_NAME(EnumSymbols)(PRTLDRMODINTERNAL pMod, unsigned fFlags, const void *pvBits, RTUINTPTR BaseAddress,
427	PFNRTLDRENUMSYMS pfnCallback, void *pvUser)
428	{
429	PRTLDRMODELF pModElf = (PRTLDRMODELF)pMod;
430
431	/*
432	* Validate the input.
433	*/
434	Elf_Addr BaseAddr = (Elf_Addr)BaseAddress;
435	AssertMsgReturn((RTUINTPTR)BaseAddr == BaseAddress, ("#RTptr", BaseAddress), VERR_IMAGE_BASE_TOO_HIGH);
436
437	/*
438	* Make sure we've got the string and symbol tables. (We don't need the pvBits.)
439	*/
440	int rc = RTLDRELF_NAME(MapBits)(pModElf, false);
441	if (RT_FAILURE(rc))
442	return rc;
443
444	/*
445	* Enumerate the symbol table.
446	*/
447	const Elf_Sym *paSyms = pModElf->paSyms;
448	unsigned cSyms = pModElf->cSyms;
449	for (unsigned iSym = 1; iSym < cSyms; iSym++)
450	{
451	/*
452	* Skip imports (undefined).
453	*/
454	if (paSyms[iSym].st_shndx != SHN_UNDEF)
455	{
456	/*
457	* Calc value and get name.
458	*/
459	Elf_Addr Value;
460	if (paSyms[iSym].st_shndx == SHN_ABS)
461	/* absolute symbols are not subject to any relocation. */
462	Value = paSyms[iSym].st_value;
463	else if (paSyms[iSym].st_shndx < pModElf->Ehdr.e_shnum)
464	/* relative to the section. */
465	Value = BaseAddr + paSyms[iSym].st_value + pModElf->paShdrs[paSyms[iSym].st_shndx].sh_addr;
466	else
467	{
468	AssertMsgFailed(("Arg! paSyms[%u].st_shndx=" FMT_ELF_HALF "\n", iSym, paSyms[iSym].st_shndx));
469	return VERR_BAD_EXE_FORMAT;
470	}
471	const char *pszName = ELF_STR(pModElf, paSyms[iSym].st_name);
472	if ( (pszName && *pszName)
473	&& ( (fFlags & RTLDR_ENUM_SYMBOL_FLAGS_ALL)
474	\|\| ELF_ST_BIND(paSyms[iSym].st_info) == STB_GLOBAL)
475	)
476	{
477	/*
478	* Call back.
479	*/
480	AssertMsgReturn(Value == (RTUINTPTR)Value, (FMT_ELF_ADDR "\n", Value), VERR_SYMBOL_VALUE_TOO_BIG);
481	int rc = pfnCallback(pMod, pszName, ~0, (RTUINTPTR)Value, pvUser);
482	if (rc)
483	return rc;
484	}
485	}
486	}
487
488	return VINF_SUCCESS;
489	}
490
491
492	/** @copydoc RTLDROPS::GetImageSize */
493	static DECLCALLBACK(size_t) RTLDRELF_NAME(GetImageSize)(PRTLDRMODINTERNAL pMod)
494	{
495	PRTLDRMODELF pModElf = (PRTLDRMODELF)pMod;
496
497	return pModElf->cbImage;
498	}
499
500
501	/** @copydoc RTLDROPS::GetBits */
502	static DECLCALLBACK(int) RTLDRELF_NAME(GetBits)(PRTLDRMODINTERNAL pMod, void pvBits, RTUINTPTR BaseAddress, PFNRTLDRIMPORT pfnGetImport, void pvUser)
503	{
504	PRTLDRMODELF pModElf = (PRTLDRMODELF)pMod;
505
506	/*
507	* Load the bits into pvBits.
508	*/
509	const Elf_Shdr *paShdrs = pModElf->paShdrs;
510	for (unsigned iShdr = 0; iShdr < pModElf->Ehdr.e_shnum; iShdr++)
511	{
512	if (paShdrs[iShdr].sh_flags & SHF_ALLOC)
513	{
514	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);
515	switch (paShdrs[iShdr].sh_type)
516	{
517	case SHT_NOBITS:
518	memset((uint8_t *)pvBits + paShdrs[iShdr].sh_addr, 0, (size_t)paShdrs[iShdr].sh_size);
519	break;
520
521	case SHT_PROGBITS:
522	default:
523	{
524	int rc = pModElf->pReader->pfnRead(pModElf->pReader, (uint8_t *)pvBits + paShdrs[iShdr].sh_addr,
525	(size_t)paShdrs[iShdr].sh_size, paShdrs[iShdr].sh_offset);
526	if (RT_FAILURE(rc))
527	{
528	Log(("RTLdrELF: %s: Read error when reading " FMT_ELF_SIZE " bytes at " FMT_ELF_OFF ", iShdr=%d\n",
529	pModElf->pReader->pfnLogName(pModElf->pReader),
530	paShdrs[iShdr].sh_size, paShdrs[iShdr].sh_offset, iShdr));
531	return rc;
532	}
533	}
534	}
535	}
536	}
537
538	/*
539	* Relocate the image.
540	*/
541	return pModElf->Core.pOps->pfnRelocate(pMod, pvBits, BaseAddress, ~(RTUINTPTR)0, pfnGetImport, pvUser);
542	}
543
544
545	/** @copydoc RTLDROPS::Relocate */
546	static DECLCALLBACK(int) RTLDRELF_NAME(Relocate)(PRTLDRMODINTERNAL pMod, void pvBits, RTUINTPTR NewBaseAddress, RTUINTPTR OldBaseAddress, PFNRTLDRIMPORT pfnGetImport, void pvUser)
547	{
548	PRTLDRMODELF pModElf = (PRTLDRMODELF)pMod;
549
550	/*
551	* Validate the input.
552	*/
553	Elf_Addr BaseAddr = (Elf_Addr)NewBaseAddress;
554	AssertMsgReturn((RTUINTPTR)BaseAddr == NewBaseAddress, ("#RTptr", NewBaseAddress), VERR_IMAGE_BASE_TOO_HIGH);
555
556	/*
557	* Map the image bits if not already done and setup pointer into it.
558	*/
559	int rc = RTLDRELF_NAME(MapBits)(pModElf, true);
560	if (RT_FAILURE(rc))
561	return rc;
562
563	/*
564	* Iterate the sections looking for interesting SHT_REL[A] sections.
565	* SHT_REL[A] sections have the section index of the section they contain fixups
566	* for in the sh_info member.
567	*/
568	const Elf_Shdr *paShdrs = pModElf->paShdrs;
569	#ifdef LOG_ENABLED
570	const char *pszLogName = pModElf->pReader->pfnLogName(pModElf->pReader);
571	Log2(("rtLdrElf: %s: Fixing up image\n", pszLogName));
572	#endif
573	for (unsigned iShdr = 0; iShdr < pModElf->Ehdr.e_shnum; iShdr++)
574	{
575	const Elf_Shdr *pShdrRel = &paShdrs[iShdr];
576
577	/*
578	* Skip sections without interest to us.
579	*/
580	#if ELF_MODE == 32
581	if (pShdrRel->sh_type != SHT_REL)
582	#else
583	if (pShdrRel->sh_type != SHT_RELA)
584	#endif
585	continue;
586	if (pShdrRel->sh_info >= pModElf->Ehdr.e_shnum)
587	continue;
588	const Elf_Shdr pShdr = &paShdrs[pShdrRel->sh_info]; / the section to fixup. */
589	if (!(pShdr->sh_flags & SHF_ALLOC))
590	continue;
591
592	/*
593	* Relocate the section.
594	*/
595	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",
596	pszLogName, (int)pShdrRel->sh_info, ELF_STR(pModElf, pShdr->sh_name), (int)pShdr->sh_info, (int)pShdr->sh_link,
597	iShdr, ELF_STR(pModElf, pShdrRel->sh_name), (int)pShdrRel->sh_info, (int)pShdrRel->sh_link));
598
599	/** @todo Make RelocateSection a function pointer so we can select the one corresponding to the machine when opening the image. */
600	rc = RTLDRELF_NAME(RelocateSection)(pModElf, BaseAddr, pfnGetImport, pvUser,
601	pShdr->sh_addr,
602	pShdr->sh_size,
603	(const uint8_t *)pModElf->pvBits + pShdr->sh_offset,
604	(uint8_t *)pvBits + pShdr->sh_addr,
605	(const uint8_t *)pModElf->pvBits + pShdrRel->sh_offset,
606	pShdrRel->sh_size);
607	if (RT_FAILURE(rc))
608	return rc;
609	}
610	return VINF_SUCCESS;
611	}
612
613
614	/** @copydoc RTLDROPS::pfnGetSymbolEx */
615	static DECLCALLBACK(int) RTLDRELF_NAME(GetSymbolEx)(PRTLDRMODINTERNAL pMod, const void pvBits, RTUINTPTR BaseAddress, const char pszSymbol, RTUINTPTR *pValue)
616	{
617	PRTLDRMODELF pModElf = (PRTLDRMODELF)pMod;
618	NOREF(pvBits);
619
620	/*
621	* Validate the input.
622	*/
623	Elf_Addr BaseAddr = (Elf_Addr)BaseAddress;
624	AssertMsgReturn((RTUINTPTR)BaseAddr == BaseAddress, ("#RTptr", BaseAddress), VERR_IMAGE_BASE_TOO_HIGH);
625
626	/*
627	* Map the image bits if not already done and setup pointer into it.
628	*/
629	int rc = RTLDRELF_NAME(MapBits)(pModElf, true);
630	if (RT_FAILURE(rc))
631	return rc;
632
633	/*
634	* Calc all kinds of pointers before we start iterating the symbol table.
635	*/
636	const char *pStr = pModElf->pStr;
637	const Elf_Sym *paSyms = pModElf->paSyms;
638	unsigned cSyms = pModElf->cSyms;
639	for (unsigned iSym = 1; iSym < cSyms; iSym++)
640	{
641	/* Undefined symbols are not exports, they are imports. */
642	if ( paSyms[iSym].st_shndx != SHN_UNDEF
643	&& ( ELF_ST_BIND(paSyms[iSym].st_info) == STB_GLOBAL
644	\|\| ELF_ST_BIND(paSyms[iSym].st_info) == STB_WEAK))
645	{
646	/* Validate the name string and try match with it. */
647	if (paSyms[iSym].st_name < pModElf->cbStr)
648	{
649	if (!strcmp(pszSymbol, pStr + paSyms[iSym].st_name))
650	{
651	/* matched! */
652	Elf_Addr Value;
653	if (paSyms[iSym].st_shndx == SHN_ABS)
654	/* absolute symbols are not subject to any relocation. */
655	Value = paSyms[iSym].st_value;
656	else if (paSyms[iSym].st_shndx < pModElf->Ehdr.e_shnum)
657	/* relative to the section. */
658	Value = BaseAddr + paSyms[iSym].st_value + pModElf->paShdrs[paSyms[iSym].st_shndx].sh_addr;
659	else
660	{
661	AssertMsgFailed(("Arg. paSyms[iSym].st_shndx=%d\n", paSyms[iSym].st_shndx));
662	return VERR_BAD_EXE_FORMAT;
663	}
664	AssertMsgReturn(Value == (RTUINTPTR)Value, (FMT_ELF_ADDR "\n", Value), VERR_SYMBOL_VALUE_TOO_BIG);
665	*pValue = (RTUINTPTR)Value;
666	return VINF_SUCCESS;
667	}
668	}
669	else
670	{
671	AssertMsgFailed(("String outside string table! iSym=%d paSyms[iSym].st_name=%#x\n", iSym, paSyms[iSym].st_name));
672	return VERR_LDRELF_INVALID_SYMBOL_NAME_OFFSET;
673	}
674	}
675	}
676
677	return VERR_SYMBOL_NOT_FOUND;
678	}
679
680
681
682	/**
683	* The ELF module operations.
684	*/
685	static RTLDROPS RTLDRELF_MID(s_rtldrElf,Ops) =
686	{
687	#if ELF_MODE == 32
688	"elf32",
689	#elif ELF_MODE == 64
690	"elf64",
691	#endif
692	RTLDRELF_NAME(Close),
693	NULL, /* Get Symbol */
694	RTLDRELF_NAME(Done),
695	RTLDRELF_NAME(EnumSymbols),
696	/* ext: */
697	RTLDRELF_NAME(GetImageSize),
698	RTLDRELF_NAME(GetBits),
699	RTLDRELF_NAME(Relocate),
700	RTLDRELF_NAME(GetSymbolEx),
701	0
702	};
703
704
705
706	/**
707	* Validates the ELF header.
708	*
709	* @returns iprt status code.
710	* @param pEhdr Pointer to the ELF header.
711	* @param pszLogName The log name.
712	* @param cbRawImage The size of the raw image.
713	*/
714	static int RTLDRELF_NAME(ValidateElfHeader)(const Elf_Ehdr pEhdr, const char pszLogName, uint64_t cbRawImage)
715	{
716	Log3(("RTLdrELF: e_ident: %.*Rhxs\n"
717	"RTLdrELF: e_type: " FMT_ELF_HALF "\n"
718	"RTLdrELF: e_version: " FMT_ELF_HALF "\n"
719	"RTLdrELF: e_entry: " FMT_ELF_ADDR "\n"
720	"RTLdrELF: e_phoff: " FMT_ELF_OFF "\n"
721	"RTLdrELF: e_shoff: " FMT_ELF_OFF "\n"
722	"RTLdrELF: e_flags: " FMT_ELF_WORD "\n"
723	"RTLdrELF: e_ehsize: " FMT_ELF_HALF "\n"
724	"RTLdrELF: e_phentsize: " FMT_ELF_HALF "\n"
725	"RTLdrELF: e_phnum: " FMT_ELF_HALF "\n"
726	"RTLdrELF: e_shentsize: " FMT_ELF_HALF "\n"
727	"RTLdrELF: e_shnum: " FMT_ELF_HALF "\n"
728	"RTLdrELF: e_shstrndx: " FMT_ELF_HALF "\n",
729	ELEMENTS(pEhdr->e_ident), &pEhdr->e_ident[0], pEhdr->e_type, pEhdr->e_version,
730	pEhdr->e_entry, pEhdr->e_phoff, pEhdr->e_shoff,pEhdr->e_flags, pEhdr->e_ehsize, pEhdr->e_phentsize,
731	pEhdr->e_phnum, pEhdr->e_shentsize, pEhdr->e_shnum, pEhdr->e_shstrndx));
732
733	if ( pEhdr->e_ident[EI_MAG0] != ELFMAG0
734	\|\| pEhdr->e_ident[EI_MAG1] != ELFMAG1
735	\|\| pEhdr->e_ident[EI_MAG2] != ELFMAG2
736	\|\| pEhdr->e_ident[EI_MAG3] != ELFMAG3
737	)
738	{
739	Log(("RTLdrELF: %s: Invalid ELF magic (%.*Rhxs)\n", pszLogName, sizeof(pEhdr->e_ident), pEhdr->e_ident));
740	return VERR_BAD_EXE_FORMAT;
741	}
742	if (pEhdr->e_ident[EI_CLASS] != RTLDRELF_SUFF(ELFCLASS))
743	{
744	Log(("RTLdrELF: %s: Invalid ELF class (%.*Rhxs)\n", pszLogName, sizeof(pEhdr->e_ident), pEhdr->e_ident));
745	return VERR_BAD_EXE_FORMAT;
746	}
747	if (pEhdr->e_ident[EI_DATA] != ELFDATA2LSB)
748	{
749	Log(("RTLdrELF: %s: ELF endian %x is unsupported\n", pEhdr->e_ident[EI_DATA]));
750	return VERR_LDRELF_ODD_ENDIAN;
751	}
752	if (pEhdr->e_version != EV_CURRENT)
753	{
754	Log(("RTLdrELF: %s: ELF version %x is unsupported\n", pEhdr->e_version));
755	return VERR_LDRELF_VERSION;
756	}
757
758	if (sizeof(Elf_Ehdr) != pEhdr->e_ehsize)
759	{
760	Log(("RTLdrELF: %s: Elf header e_ehsize is %d expected %d!\n",
761	pszLogName, pEhdr->e_ehsize, sizeof(Elf_Ehdr)));
762	return VERR_BAD_EXE_FORMAT;
763	}
764	if ( sizeof(Elf_Phdr) != pEhdr->e_phentsize
765	&& ( pEhdr->e_phnum != 0
766	\|\| pEhdr->e_type == ET_DYN))
767	{
768	Log(("RTLdrELF: %s: Elf header e_phentsize is %d expected %d!\n",
769	pszLogName, pEhdr->e_phentsize, sizeof(Elf_Phdr)));
770	return VERR_BAD_EXE_FORMAT;
771	}
772	if (sizeof(Elf_Shdr) != pEhdr->e_shentsize)
773	{
774	Log(("RTLdrELF: %s: Elf header e_shentsize is %d expected %d!\n",
775	pszLogName, pEhdr->e_shentsize, sizeof(Elf_Shdr)));
776	return VERR_BAD_EXE_FORMAT;
777	}
778
779	switch (pEhdr->e_type)
780	{
781	case ET_REL:
782	break;
783	case ET_EXEC:
784	Log(("RTLdrELF: %s: Executable images are not supported yet!\n", pszLogName));
785	return VERR_LDRELF_EXEC;
786	case ET_DYN:
787	Log(("RTLdrELF: %s: Dynamic images are not supported yet!\n", pszLogName));
788	return VERR_LDRELF_DYN;
789	default:
790	Log(("RTLdrELF: %s: image type %#x is not supported!\n", pszLogName, pEhdr->e_type));
791	return VERR_BAD_EXE_FORMAT;
792	}
793
794	switch (pEhdr->e_machine)
795	{
796	#if ELF_MODE == 32
797	case EM_386:
798	case EM_486:
799	#elif ELF_MODE == 64
800	case EM_X86_64:
801	#endif
802	break;
803	default:
804	Log(("RTLdrELF: %s: machine type %u is not supported!\n", pEhdr->e_machine));
805	return VERR_LDRELF_MACHINE;
806	}
807
808	if ( pEhdr->e_phoff < pEhdr->e_ehsize
809	&& !(pEhdr->e_phoff && pEhdr->e_phnum)
810	&& pEhdr->e_phnum)
811	{
812	Log(("RTLdrELF: %s: The program headers overlap with the ELF header! e_phoff=" FMT_ELF_OFF "\n",
813	pszLogName, pEhdr->e_phoff));
814	return VERR_BAD_EXE_FORMAT;
815	}
816	if ( pEhdr->e_phoff + pEhdr->e_phnum * pEhdr->e_phentsize > cbRawImage
817	\|\| pEhdr->e_phoff + pEhdr->e_phnum * pEhdr->e_phentsize < pEhdr->e_phoff)
818	{
819	Log(("RTLdrELF: %s: The program headers extends beyond the file! e_phoff=" FMT_ELF_OFF " e_phnum=" FMT_ELF_HALF "\n",
820	pszLogName, pEhdr->e_phoff, pEhdr->e_phnum));
821	return VERR_BAD_EXE_FORMAT;
822	}
823
824
825	if ( pEhdr->e_shoff < pEhdr->e_ehsize
826	&& !(pEhdr->e_shoff && pEhdr->e_shnum))
827	{
828	Log(("RTLdrELF: %s: The section headers overlap with the ELF header! e_shoff=" FMT_ELF_OFF "\n",
829	pszLogName, pEhdr->e_shoff));
830	return VERR_BAD_EXE_FORMAT;
831	}
832	if ( pEhdr->e_shoff + pEhdr->e_shnum * pEhdr->e_shentsize > cbRawImage
833	\|\| pEhdr->e_shoff + pEhdr->e_shnum * pEhdr->e_shentsize < pEhdr->e_shoff)
834	{
835	Log(("RTLdrELF: %s: The section headers extends beyond the file! e_shoff=" FMT_ELF_OFF " e_shnum=" FMT_ELF_HALF "\n",
836	pszLogName, pEhdr->e_shoff, pEhdr->e_shnum));
837	return VERR_BAD_EXE_FORMAT;
838	}
839
840	return VINF_SUCCESS;
841	}
842
843	/**
844	* Gets the section header name.
845	*
846	* @returns pszName.
847	* @param pReader The loader reader instance.
848	* @param pEhdr The elf header.
849	* @param offName The offset of the section header name.
850	* @param pszName Where to store the name.
851	* @param cbName The size of the buffer pointed to by pszName.
852	*/
853	const char RTLDRELF_NAME(GetSHdrName)(PRTLDRMODELF pModElf, Elf_Word offName, char pszName, size_t cbName)
854	{
855	RTFOFF off = pModElf->paShdrs[pModElf->Ehdr.e_shstrndx].sh_offset + offName;
856	int rc = pModElf->pReader->pfnRead(pModElf->pReader, pszName, cbName - 1, off);
857	if (RT_FAILURE(rc))
858	{
859	/* read by for byte. */
860	for (unsigned i = 0; i < cbName; i++, off++)
861	{
862	int rc = pModElf->pReader->pfnRead(pModElf->pReader, pszName + i, 1, off);
863	if (RT_FAILURE(rc))
864	{
865	pszName[i] = '\0';
866	break;
867	}
868	}
869	}
870
871	pszName[cbName - 1] = '\0';
872	return pszName;
873	}
874
875
876	/**
877	* Validates a section header.
878	*
879	* @returns iprt status code.
880	* @param pModElf Pointer to the module structure.
881	* @param iShdr The index of section header which should be validated.
882	* The section headers are found in the pModElf->paShdrs array.
883	* @param pszLogName The log name.
884	* @param cbRawImage The size of the raw image.
885	*/
886	static int RTLDRELF_NAME(ValidateSectionHeader)(PRTLDRMODELF pModElf, unsigned iShdr, const char *pszLogName, RTFOFF cbRawImage)
887	{
888	const Elf_Shdr *pShdr = &pModElf->paShdrs[iShdr];
889	char szSectionName[80]; NOREF(szSectionName);
890	Log3(("RTLdrELF: Section Header #%d:\n"
891	"RTLdrELF: sh_name: " FMT_ELF_WORD " - %s\n"
892	"RTLdrELF: sh_type: " FMT_ELF_WORD " (%s)\n"
893	"RTLdrELF: sh_flags: " FMT_ELF_XWORD "\n"
894	"RTLdrELF: sh_addr: " FMT_ELF_ADDR "\n"
895	"RTLdrELF: sh_offset: " FMT_ELF_OFF "\n"
896	"RTLdrELF: sh_size: " FMT_ELF_XWORD "\n"
897	"RTLdrELF: sh_link: " FMT_ELF_WORD "\n"
898	"RTLdrELF: sh_info: " FMT_ELF_WORD "\n"
899	"RTLdrELF: sh_addralign: " FMT_ELF_XWORD "\n"
900	"RTLdrELF: sh_entsize: " FMT_ELF_XWORD "\n",
901	iShdr,
902	pShdr->sh_name, RTLDRELF_NAME(GetSHdrName)(pModElf, pShdr->sh_name, szSectionName, sizeof(szSectionName)),
903	pShdr->sh_type, rtldrElfGetShdrType(pShdr->sh_type), pShdr->sh_flags, pShdr->sh_addr,
904	pShdr->sh_offset, pShdr->sh_size, pShdr->sh_link, pShdr->sh_info, pShdr->sh_addralign,
905	pShdr->sh_entsize));
906
907	if (pShdr->sh_link >= pModElf->Ehdr.e_shnum)
908	{
909	Log(("RTLdrELF: %s: Shdr #%d: sh_link (%d) is beyond the end of the section table (%d)!\n",
910	pszLogName, iShdr, pShdr->sh_link, pModElf->Ehdr.e_shnum));
911	return VERR_BAD_EXE_FORMAT;
912	}
913
914	switch (pShdr->sh_type)
915	{
916	/** @todo find specs and check up which sh_info fields indicates section table entries */
917	case 12301230:
918	if (pShdr->sh_info >= pModElf->Ehdr.e_shnum)
919	{
920	Log(("RTLdrELF: %s: Shdr #%d: sh_info (%d) is beyond the end of the section table (%d)!\n",
921	pszLogName, iShdr, pShdr->sh_link, pModElf->Ehdr.e_shnum));
922	return VERR_BAD_EXE_FORMAT;
923	}
924	break;
925
926	case SHT_NULL:
927	case SHT_PROGBITS:
928	case SHT_SYMTAB:
929	case SHT_STRTAB:
930	case SHT_RELA:
931	case SHT_HASH:
932	case SHT_DYNAMIC:
933	case SHT_NOTE:
934	case SHT_NOBITS:
935	case SHT_REL:
936	case SHT_SHLIB:
937	case SHT_DYNSYM:
938	/*
939	* For these types sh_info doesn't have any special meaning, or anything which
940	* we need/can validate now.
941	*/
942	break;
943
944
945	default:
946	Log(("RTLdrELF: %s: Warning, unknown type %d!\n", pszLogName, pShdr->sh_type));
947	break;
948	}
949
950	if ( pShdr->sh_type != SHT_NOBITS
951	&& pShdr->sh_size)
952	{
953	RTFOFF offEnd = pShdr->sh_offset + pShdr->sh_size;
954	if ( offEnd > cbRawImage
955	\|\| offEnd < (RTFOFF)pShdr->sh_offset)
956	{
957	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",
958	pszLogName, iShdr, pShdr->sh_offset, pShdr->sh_size, offEnd, cbRawImage));
959	return VERR_BAD_EXE_FORMAT;
960	}
961	if (pShdr->sh_offset < sizeof(Elf_Ehdr))
962	{
963	Log(("RTLdrELF: %s: Shdr #%d: sh_offset (" FMT_ELF_OFF ") + sh_size (" FMT_ELF_XWORD ") is starting in the ELF header!\n",
964	pszLogName, iShdr, pShdr->sh_offset, pShdr->sh_size, cbRawImage));
965	return VERR_BAD_EXE_FORMAT;
966	}
967	}
968
969	return VINF_SUCCESS;
970	}
971
972
973
974	/**
975	* Opens an ELF image, fixed bitness.
976	*
977	* @returns iprt status code.
978	* @param pReader The loader reader instance which will provide the raw image bits.
979	* @param phLdrMod Where to store the handle.
980	*/
981	static int RTLDRELF_NAME(Open)(PRTLDRREADER pReader, PRTLDRMOD phLdrMod)
982	{
983	const char *pszLogName = pReader->pfnLogName(pReader);
984	RTFOFF cbRawImage = pReader->pfnSize(pReader);
985
986	/*
987	* Create the loader module instance.
988	*/
989	PRTLDRMODELF pModElf = (PRTLDRMODELF)RTMemAllocZ(sizeof(*pModElf));
990	if (!pModElf)
991	return VERR_NO_MEMORY;
992
993	pModElf->Core.u32Magic = RTLDRMOD_MAGIC;
994	pModElf->Core.eState = LDR_STATE_INVALID;
995	pModElf->pReader = pReader;
996	//pModElf->pvBits = NULL;
997	//pModElf->Ehdr = {0};
998	//pModElf->paShdrs = NULL;
999	//pModElf->paSyms = NULL;
1000	pModElf->iSymSh = ~0U;
1001	pModElf->cSyms = 0;
1002	pModElf->iStrSh = ~0U;
1003	pModElf->cbStr = 0;
1004	pModElf->cbImage = 0;
1005	//pModElf->pStr = NULL;
1006
1007	/*
1008	* Read and validate the ELF header.
1009	*/
1010	int rc = pReader->pfnRead(pReader, &pModElf->Ehdr, sizeof(pModElf->Ehdr), 0);
1011	if (RT_SUCCESS(rc))
1012	rc = RTLDRELF_NAME(ValidateElfHeader)(&pModElf->Ehdr, pszLogName, cbRawImage);
1013	if (RT_SUCCESS(rc))
1014	{
1015	/*
1016	* Read the section headers.
1017	*/
1018	Elf_Shdr paShdrs = (Elf_Shdr )RTMemAlloc(pModElf->Ehdr.e_shnum * sizeof(Elf_Shdr));
1019	if (paShdrs)
1020	{
1021	pModElf->paShdrs = paShdrs;
1022	rc = pReader->pfnRead(pReader, paShdrs, pModElf->Ehdr.e_shnum * sizeof(Elf_Shdr),
1023	pModElf->Ehdr.e_shoff);
1024	if (RT_SUCCESS(rc))
1025	{
1026	/*
1027	* Validate the section headers, allocate memory for the sections (determin the image size),
1028	* and find relevant sections.
1029	*/
1030	for (unsigned i = 0; i < pModElf->Ehdr.e_shnum; i++)
1031	{
1032	rc = RTLDRELF_NAME(ValidateSectionHeader)(pModElf, i, pszLogName, cbRawImage);
1033	if (RT_FAILURE(rc))
1034	break;
1035
1036	/* Allocate memory addresses for the section. */
1037	if (paShdrs[i].sh_flags & SHF_ALLOC)
1038	{
1039	paShdrs[i].sh_addr = paShdrs[i].sh_addralign
1040	? RT_ALIGN_T(pModElf->cbImage, paShdrs[i].sh_addralign, Elf_Addr)
1041	: pModElf->cbImage;
1042	pModElf->cbImage = (size_t)paShdrs[i].sh_addr + (size_t)paShdrs[i].sh_size;
1043	AssertMsgReturn(pModElf->cbImage == paShdrs[i].sh_addr + paShdrs[i].sh_size,
1044	(FMT_ELF_ADDR "\n", paShdrs[i].sh_addr + paShdrs[i].sh_size),
1045	VERR_IMAGE_TOO_BIG);
1046	Log2(("RTLdrElf: %s: Assigned " FMT_ELF_ADDR " to section #%d\n", pszLogName, paShdrs[i].sh_addr, i));
1047	}
1048
1049	/* We're looking for symbol tables. */
1050	if (paShdrs[i].sh_type == SHT_SYMTAB)
1051	{
1052	if (pModElf->iSymSh != ~0U)
1053	{
1054	Log(("RTLdrElf: %s: Multiple symbol tabs! iSymSh=%d i=%d\n", pszLogName, pModElf->iSymSh, i));
1055	rc = VERR_LDRELF_MULTIPLE_SYMTABS;
1056	break;
1057	}
1058	pModElf->iSymSh = i;
1059	pModElf->cSyms = (unsigned)(paShdrs[i].sh_size / sizeof(Elf_Sym));
1060	AssertReturn(pModElf->cSyms == paShdrs[i].sh_size / sizeof(Elf_Sym), VERR_IMAGE_TOO_BIG);
1061	pModElf->iStrSh = paShdrs[i].sh_link;
1062	pModElf->cbStr = (unsigned)paShdrs[pModElf->iStrSh].sh_size;
1063	AssertReturn(pModElf->cbStr == paShdrs[pModElf->iStrSh].sh_size, VERR_IMAGE_TOO_BIG);
1064	}
1065	} /* for each section header */
1066
1067	Log2(("RTLdrElf: iSymSh=%u cSyms=%u iStrSh=%u cbStr=%u rc=%Rrc cbImage=%#zx\n",
1068	pModElf->iSymSh, pModElf->cSyms, pModElf->iStrSh, pModElf->cbStr, rc, pModElf->cbImage));
1069
1070	/*
1071	* Are the section headers fine?
1072	* We require there to be symbol & string tables (at least for the time being).
1073	*/
1074	if ( pModElf->iSymSh == ~0U
1075	\|\| pModElf->iStrSh == ~0U)
1076	rc = VERR_LDRELF_NO_SYMBOL_OR_NO_STRING_TABS;
1077	if (RT_SUCCESS(rc))
1078	{
1079	pModElf->Core.pOps = &RTLDRELF_MID(s_rtldrElf,Ops);
1080	pModElf->Core.eState = LDR_STATE_OPENED;
1081	*phLdrMod = &pModElf->Core;
1082
1083	LogFlow(("%s: %s: returns VINF_SUCCESS phLdrMod=%p\n", __FUNCTION__, pszLogName, phLdrMod));
1084	return VINF_SUCCESS;
1085	}
1086	}
1087
1088	RTMemFree(paShdrs);
1089	}
1090	else
1091	rc = VERR_NO_MEMORY;
1092	}
1093
1094	RTMemFree(pModElf);
1095	LogFlow(("%s: returns %Rrc\n", __FUNCTION__, rc));
1096	return rc;
1097	}
1098
1099
1100
1101
1102	/*******************************************************************************
1103	* Cleanup Constants And Macros *
1104	*******************************************************************************/
1105	#undef RTLDRELF_NAME
1106	#undef RTLDRELF_SUFF
1107	#undef RTLDRELF_MID
1108
1109	#undef FMT_ELF_ADDR
1110	#undef FMT_ELF_HALF
1111	#undef FMT_ELF_SHALF
1112	#undef FMT_ELF_OFF
1113	#undef FMT_ELF_SIZE
1114	#undef FMT_ELF_SWORD
1115	#undef FMT_ELF_WORD
1116	#undef FMT_ELF_XWORD
1117	#undef FMT_ELF_SXWORD
1118
1119	#undef Elf_Ehdr
1120	#undef Elf_Phdr
1121	#undef Elf_Shdr
1122	#undef Elf_Sym
1123	#undef Elf_Rel
1124	#undef Elf_Rela
1125	#undef Elf_Reloc
1126	#undef Elf_Nhdr
1127	#undef Elf_Dyn
1128
1129	#undef Elf_Addr
1130	#undef Elf_Half
1131	#undef Elf_Off
1132	#undef Elf_Size
1133	#undef Elf_Sword
1134	#undef Elf_Word
1135
1136	#undef RTLDRMODELF
1137	#undef PRTLDRMODELF
1138
1139	#undef ELF_R_SYM
1140	#undef ELF_R_TYPE
1141	#undef ELF_R_INFO
1142
1143	#undef ELF_ST_BIND
1144

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

source: vbox/trunk/src/VBox/Runtime/ldrELFRelocatable.cpp.h@ 3282

Download in other formats: