ldrELFRelocatable.cpp.h@ 73494

Last change on this file since 73494 was 73494, checked in by vboxsync, 7 years ago
IPRT: Added single stack frame unwind function to RTDbgMod and RTLdr, copying over the PoC from DBGFRStack.cpp. bugref:3897
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1	/* $Id: ldrELFRelocatable.cpp.h 73494 2018-08-04 19:41:30Z vboxsync $ */
2	/** @file
3	* IPRT - Binary Image Loader, Template for ELF Relocatable Images.
4	*/
5
6	/*
7	* Copyright (C) 2006-2017 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 readonly mapping of the image bits.
96	* This mapping is provided by the pReader. */
97	const void *pvBits;
98
99	/** The ELF header. */
100	Elf_Ehdr Ehdr;
101	/** Pointer to our copy of the section headers with sh_addr as RVAs.
102	* The virtual addresses in this array is the 0 based assignments we've given the image.
103	* Not valid if the image is DONE. */
104	Elf_Shdr *paShdrs;
105	/** Unmodified section headers (allocated after paShdrs, so no need to free).
106	* Not valid if the image is DONE. */
107	Elf_Shdr const *paOrgShdrs;
108	/** The size of the loaded image. */
109	size_t cbImage;
110
111	/** The image base address if it's an EXEC or DYN image. */
112	Elf_Addr LinkAddress;
113
114	/** The symbol section index. */
115	unsigned iSymSh;
116	/** Number of symbols in the table. */
117	unsigned cSyms;
118	/** Pointer to symbol table within RTLDRMODELF::pvBits. */
119	const Elf_Sym *paSyms;
120
121	/** The string section index. */
122	unsigned iStrSh;
123	/** Size of the string table. */
124	unsigned cbStr;
125	/** Pointer to string table within RTLDRMODELF::pvBits. */
126	const char *pStr;
127
128	/** Size of the section header string table. */
129	unsigned cbShStr;
130	/** Pointer to section header string table within RTLDRMODELF::pvBits. */
131	const char *pShStr;
132	} RTLDRMODELF, *PRTLDRMODELF;
133
134
135	/**
136	* Maps the image bits into memory and resolve pointers into it.
137	*
138	* @returns iprt status code.
139	* @param pModElf The ELF loader module instance data.
140	* @param fNeedsBits Set if we actually need the pvBits member.
141	* If we don't, we can simply read the string and symbol sections, thus saving memory.
142	*/
143	static int RTLDRELF_NAME(MapBits)(PRTLDRMODELF pModElf, bool fNeedsBits)
144	{
145	NOREF(fNeedsBits);
146	if (pModElf->pvBits)
147	return VINF_SUCCESS;
148	int rc = pModElf->Core.pReader->pfnMap(pModElf->Core.pReader, &pModElf->pvBits);
149	if (RT_SUCCESS(rc))
150	{
151	const uint8_t pu8 = (const uint8_t )pModElf->pvBits;
152	if (pModElf->iSymSh != ~0U)
153	pModElf->paSyms = (const Elf_Sym *)(pu8 + pModElf->paShdrs[pModElf->iSymSh].sh_offset);
154	if (pModElf->iStrSh != ~0U)
155	pModElf->pStr = (const char *)(pu8 + pModElf->paShdrs[pModElf->iStrSh].sh_offset);
156	pModElf->pShStr = (const char *)(pu8 + pModElf->paShdrs[pModElf->Ehdr.e_shstrndx].sh_offset);
157	}
158	return rc;
159	}
160
161
162	/*
163	*
164	* EXEC & DYN.
165	* EXEC & DYN.
166	* EXEC & DYN.
167	* EXEC & DYN.
168	* EXEC & DYN.
169	*
170	*/
171
172
173	/**
174	* Applies the fixups for a section in an executable image.
175	*
176	* @returns iprt status code.
177	* @param pModElf The ELF loader module instance data.
178	* @param BaseAddr The base address which the module is being fixedup to.
179	* @param pfnGetImport The callback function to use to resolve imports (aka unresolved externals).
180	* @param pvUser User argument to pass to the callback.
181	* @param SecAddr The section address. This is the address the relocations are relative to.
182	* @param cbSec The section size. The relocations must be inside this.
183	* @param pu8SecBaseR Where we read section bits from.
184	* @param pu8SecBaseW Where we write section bits to.
185	* @param pvRelocs Pointer to where we read the relocations from.
186	* @param cbRelocs Size of the relocations.
187	*/
188	static int RTLDRELF_NAME(RelocateSectionExecDyn)(PRTLDRMODELF pModElf, Elf_Addr BaseAddr,
189	PFNRTLDRIMPORT pfnGetImport, void *pvUser,
190	const Elf_Addr SecAddr, Elf_Size cbSec,
191	const uint8_t pu8SecBaseR, uint8_t pu8SecBaseW,
192	const void *pvRelocs, Elf_Size cbRelocs)
193	{
194	#if ELF_MODE != 32
195	NOREF(pu8SecBaseR);
196	#endif
197
198	/*
199	* Iterate the relocations.
200	* The relocations are stored in an array of Elf32_Rel records and covers the entire relocation section.
201	*/
202	const Elf_Addr offDelta = BaseAddr - pModElf->LinkAddress;
203	const Elf_Reloc paRels = (const Elf_Reloc )pvRelocs;
204	const unsigned iRelMax = (unsigned)(cbRelocs / sizeof(paRels[0]));
205	AssertMsgReturn(iRelMax == cbRelocs / sizeof(paRels[0]), (FMT_ELF_SIZE "\n", cbRelocs / sizeof(paRels[0])),
206	VERR_IMAGE_TOO_BIG);
207	for (unsigned iRel = 0; iRel < iRelMax; iRel++)
208	{
209	/*
210	* Skip R_XXX_NONE entries early to avoid confusion in the symbol
211	* getter code.
212	*/
213	#if ELF_MODE == 32
214	if (ELF_R_TYPE(paRels[iRel].r_info) == R_386_NONE)
215	continue;
216	#elif ELF_MODE == 64
217	if (ELF_R_TYPE(paRels[iRel].r_info) == R_X86_64_NONE)
218	continue;
219	#endif
220
221	/*
222	* Validate and find the symbol, resolve undefined ones.
223	*/
224	Elf_Size iSym = ELF_R_SYM(paRels[iRel].r_info);
225	if (iSym >= pModElf->cSyms)
226	{
227	AssertMsgFailed(("iSym=%d is an invalid symbol index!\n", iSym));
228	return VERR_LDRELF_INVALID_SYMBOL_INDEX;
229	}
230	const Elf_Sym *pSym = &pModElf->paSyms[iSym];
231	if (pSym->st_name >= pModElf->cbStr)
232	{
233	AssertMsgFailed(("iSym=%d st_name=%d str sh_size=%d\n", iSym, pSym->st_name, pModElf->cbStr));
234	return VERR_LDRELF_INVALID_SYMBOL_NAME_OFFSET;
235	}
236
237	Elf_Addr SymValue = 0;
238	if (pSym->st_shndx == SHN_UNDEF)
239	{
240	/* Try to resolve the symbol. */
241	const char *pszName = ELF_STR(pModElf, pSym->st_name);
242	RTUINTPTR ExtValue;
243	int rc = pfnGetImport(&pModElf->Core, "", pszName, ~0U, &ExtValue, pvUser);
244	AssertMsgRCReturn(rc, ("Failed to resolve '%s' rc=%Rrc\n", pszName, rc), rc);
245	SymValue = (Elf_Addr)ExtValue;
246	AssertMsgReturn((RTUINTPTR)SymValue == ExtValue, ("Symbol value overflowed! '%s'\n", pszName),
247	VERR_SYMBOL_VALUE_TOO_BIG);
248	Log2(("rtldrELF: #%-3d - UNDEF " FMT_ELF_ADDR " '%s'\n", iSym, SymValue, pszName));
249	}
250	else
251	{
252	AssertMsgReturn(pSym->st_shndx < pModElf->Ehdr.e_shnum \|\| pSym->st_shndx == SHN_ABS, ("%#x\n", pSym->st_shndx),
253	VERR_LDRELF_INVALID_RELOCATION_OFFSET);
254	#if ELF_MODE == 64
255	SymValue = pSym->st_value;
256	#endif
257	}
258
259	#if ELF_MODE == 64
260	/* Calc the value (indexes checked above; assumes SHN_UNDEF == 0). */
261	Elf_Addr Value;
262	if (pSym->st_shndx < pModElf->Ehdr.e_shnum)
263	Value = SymValue + offDelta;
264	else /* SHN_ABS: */
265	Value = SymValue + paRels[iRel].r_addend;
266	#endif
267
268	/*
269	* Apply the fixup.
270	*/
271	AssertMsgReturn(paRels[iRel].r_offset < cbSec, (FMT_ELF_ADDR " " FMT_ELF_SIZE "\n", paRels[iRel].r_offset, cbSec), VERR_LDRELF_INVALID_RELOCATION_OFFSET);
272	#if ELF_MODE == 32
273	const Elf_Addr pAddrR = (const Elf_Addr )(pu8SecBaseR + paRels[iRel].r_offset); /* Where to read the addend. */
274	#endif
275	Elf_Addr pAddrW = (Elf_Addr )(pu8SecBaseW + paRels[iRel].r_offset); /* Where to write the fixup. */
276	switch (ELF_R_TYPE(paRels[iRel].r_info))
277	{
278	#if ELF_MODE == 32
279	/*
280	* Absolute addressing.
281	*/
282	case R_386_32:
283	{
284	Elf_Addr Value;
285	if (pSym->st_shndx < pModElf->Ehdr.e_shnum)
286	Value = pAddrR + offDelta; / Simplified. */
287	else if (pSym->st_shndx == SHN_ABS)
288	continue; /* Internal fixup, no need to apply it. */
289	else if (pSym->st_shndx == SHN_UNDEF)
290	Value = SymValue + *pAddrR;
291	else
292	AssertFailedReturn(VERR_LDR_GENERAL_FAILURE); /** @todo SHN_COMMON */
293	(uint32_t )pAddrW = Value;
294	Log4((FMT_ELF_ADDR": R_386_32 Value=" FMT_ELF_ADDR "\n", SecAddr + paRels[iRel].r_offset + BaseAddr, Value));
295	break;
296	}
297
298	/*
299	* PC relative addressing.
300	*/
301	case R_386_PC32:
302	{
303	Elf_Addr Value;
304	if (pSym->st_shndx < pModElf->Ehdr.e_shnum)
305	continue; /* Internal fixup, no need to apply it. */
306	else if (pSym->st_shndx == SHN_ABS)
307	Value = pAddrR + offDelta; / Simplified. */
308	else if (pSym->st_shndx == SHN_UNDEF)
309	{
310	const Elf_Addr SourceAddr = SecAddr + paRels[iRel].r_offset + BaseAddr; /* Where the source really is. */
311	Value = SymValue + (uint32_t )pAddrR - SourceAddr;
312	(uint32_t )pAddrW = Value;
313	}
314	else
315	AssertFailedReturn(VERR_LDR_GENERAL_FAILURE); /** @todo SHN_COMMON */
316	Log4((FMT_ELF_ADDR": R_386_PC32 Value=" FMT_ELF_ADDR "\n", SecAddr + paRels[iRel].r_offset + BaseAddr, Value));
317	break;
318	}
319
320	#elif ELF_MODE == 64
321
322	/*
323	* Absolute addressing
324	*/
325	case R_X86_64_64:
326	{
327	(uint64_t )pAddrW = Value;
328	Log4((FMT_ELF_ADDR": R_X86_64_64 Value=" FMT_ELF_ADDR " SymValue=" FMT_ELF_ADDR "\n",
329	SecAddr + paRels[iRel].r_offset + BaseAddr, Value, SymValue));
330	break;
331	}
332
333	/*
334	* Truncated 32-bit value (zero-extendedable to the 64-bit value).
335	*/
336	case R_X86_64_32:
337	{
338	(uint32_t )pAddrW = (uint32_t)Value;
339	Log4((FMT_ELF_ADDR": R_X86_64_32 Value=" FMT_ELF_ADDR " SymValue=" FMT_ELF_ADDR "\n",
340	SecAddr + paRels[iRel].r_offset + BaseAddr, Value, SymValue));
341	AssertMsgReturn((Elf_Addr)(uint32_t )pAddrW == SymValue, ("Value=" FMT_ELF_ADDR "\n", SymValue),
342	VERR_SYMBOL_VALUE_TOO_BIG);
343	break;
344	}
345
346	/*
347	* Truncated 32-bit value (sign-extendedable to the 64-bit value).
348	*/
349	case R_X86_64_32S:
350	{
351	(int32_t )pAddrW = (int32_t)Value;
352	Log4((FMT_ELF_ADDR": R_X86_64_32S Value=" FMT_ELF_ADDR " SymValue=" FMT_ELF_ADDR "\n",
353	SecAddr + paRels[iRel].r_offset + BaseAddr, Value, SymValue));
354	AssertMsgReturn((Elf_Addr)(int32_t )pAddrW == Value, ("Value=" FMT_ELF_ADDR "\n", Value), VERR_SYMBOL_VALUE_TOO_BIG); /** @todo check the sign-extending here. */
355	break;
356	}
357
358	/*
359	* PC relative addressing.
360	*/
361	case R_X86_64_PC32:
362	case R_X86_64_PLT32: /* binutils commit 451875b4f976a527395e9303224c7881b65e12ed feature/regression. */
363	{
364	const Elf_Addr SourceAddr = SecAddr + paRels[iRel].r_offset + BaseAddr; /* Where the source really is. */
365	Value -= SourceAddr;
366	(int32_t )pAddrW = (int32_t)Value;
367	Log4((FMT_ELF_ADDR": R_X86_64_PC32 Value=" FMT_ELF_ADDR " SymValue=" FMT_ELF_ADDR "\n",
368	SourceAddr, Value, SymValue));
369	AssertMsgReturn((Elf_Addr)(int32_t )pAddrW == Value, ("Value=" FMT_ELF_ADDR "\n", Value), VERR_SYMBOL_VALUE_TOO_BIG); /** @todo check the sign-extending here. */
370	break;
371	}
372	#endif
373
374	default:
375	AssertMsgFailed(("Unknown relocation type: %d (iRel=%d iRelMax=%d)\n",
376	ELF_R_TYPE(paRels[iRel].r_info), iRel, iRelMax));
377	return VERR_LDRELF_RELOCATION_NOT_SUPPORTED;
378	}
379	}
380
381	return VINF_SUCCESS;
382	}
383
384
385
386	/*
387	*
388	* REL
389	* REL
390	* REL
391	* REL
392	* REL
393	*
394	*/
395
396	/**
397	* Get the symbol and symbol value.
398	*
399	* @returns iprt status code.
400	* @param pModElf The ELF loader module instance data.
401	* @param BaseAddr The base address which the module is being fixedup to.
402	* @param pfnGetImport The callback function to use to resolve imports (aka unresolved externals).
403	* @param pvUser User argument to pass to the callback.
404	* @param iSym The symbol to get.
405	* @param ppSym Where to store the symbol pointer on success. (read only)
406	* @param pSymValue Where to store the symbol value on success.
407	*/
408	static int RTLDRELF_NAME(Symbol)(PRTLDRMODELF pModElf, Elf_Addr BaseAddr, PFNRTLDRIMPORT pfnGetImport, void *pvUser,
409	Elf_Size iSym, const Elf_Sym *ppSym, Elf_Addr pSymValue)
410	{
411	/*
412	* Validate and find the symbol.
413	*/
414	if (iSym >= pModElf->cSyms)
415	{
416	AssertMsgFailed(("iSym=%d is an invalid symbol index!\n", iSym));
417	return VERR_LDRELF_INVALID_SYMBOL_INDEX;
418	}
419	const Elf_Sym *pSym = &pModElf->paSyms[iSym];
420	*ppSym = pSym;
421
422	if (pSym->st_name >= pModElf->cbStr)
423	{
424	AssertMsgFailed(("iSym=%d st_name=%d str sh_size=%d\n", iSym, pSym->st_name, pModElf->cbStr));
425	return VERR_LDRELF_INVALID_SYMBOL_NAME_OFFSET;
426	}
427	const char *pszName = ELF_STR(pModElf, pSym->st_name);
428
429	/*
430	* Determine the symbol value.
431	*
432	* Symbols needs different treatment depending on which section their are in.
433	* Undefined and absolute symbols goes into special non-existing sections.
434	*/
435	switch (pSym->st_shndx)
436	{
437	/*
438	* Undefined symbol, needs resolving.
439	*
440	* Since ELF has no generic concept of importing from specific module (the OS/2 ELF format
441	* has but that's a OS extension and only applies to programs and dlls), we'll have to ask
442	* the resolver callback to do a global search.
443	*/
444	case SHN_UNDEF:
445	{
446	/* Try to resolve the symbol. */
447	RTUINTPTR Value;
448	int rc = pfnGetImport(&pModElf->Core, "", pszName, ~0U, &Value, pvUser);
449	if (RT_FAILURE(rc))
450	{
451	AssertMsgFailed(("Failed to resolve '%s' rc=%Rrc\n", pszName, rc));
452	return rc;
453	}
454	*pSymValue = (Elf_Addr)Value;
455	if ((RTUINTPTR)*pSymValue != Value)
456	{
457	AssertMsgFailed(("Symbol value overflowed! '%s'\n", pszName));
458	return VERR_SYMBOL_VALUE_TOO_BIG;
459	}
460
461	Log2(("rtldrELF: #%-3d - UNDEF " FMT_ELF_ADDR " '%s'\n", iSym, *pSymValue, pszName));
462	break;
463	}
464
465	/*
466	* Absolute symbols needs no fixing since they are, well, absolute.
467	*/
468	case SHN_ABS:
469	*pSymValue = pSym->st_value;
470	Log2(("rtldrELF: #%-3d - ABS " FMT_ELF_ADDR " '%s'\n", iSym, *pSymValue, pszName));
471	break;
472
473	/*
474	* All other symbols are addressed relative to their section and need to be fixed up.
475	*/
476	default:
477	if (pSym->st_shndx >= pModElf->Ehdr.e_shnum)
478	{
479	/* what about common symbols? */
480	AssertMsg(pSym->st_shndx < pModElf->Ehdr.e_shnum,
481	("iSym=%d st_shndx=%d e_shnum=%d pszName=%s\n", iSym, pSym->st_shndx, pModElf->Ehdr.e_shnum, pszName));
482	return VERR_BAD_EXE_FORMAT;
483	}
484	*pSymValue = pSym->st_value + pModElf->paShdrs[pSym->st_shndx].sh_addr + BaseAddr;
485	Log2(("rtldrELF: #%-3d - %5d " FMT_ELF_ADDR " '%s'\n", iSym, pSym->st_shndx, *pSymValue, pszName));
486	break;
487	}
488
489	return VINF_SUCCESS;
490	}
491
492
493	/**
494	* Applies the fixups for a sections.
495	*
496	* @returns iprt status code.
497	* @param pModElf The ELF loader module instance data.
498	* @param BaseAddr The base address which the module is being fixedup to.
499	* @param pfnGetImport The callback function to use to resolve imports (aka unresolved externals).
500	* @param pvUser User argument to pass to the callback.
501	* @param SecAddr The section address. This is the address the relocations are relative to.
502	* @param cbSec The section size. The relocations must be inside this.
503	* @param pu8SecBaseR Where we read section bits from.
504	* @param pu8SecBaseW Where we write section bits to.
505	* @param pvRelocs Pointer to where we read the relocations from.
506	* @param cbRelocs Size of the relocations.
507	*/
508	static int RTLDRELF_NAME(RelocateSection)(PRTLDRMODELF pModElf, Elf_Addr BaseAddr, PFNRTLDRIMPORT pfnGetImport, void *pvUser,
509	const Elf_Addr SecAddr, Elf_Size cbSec, const uint8_t pu8SecBaseR, uint8_t pu8SecBaseW,
510	const void *pvRelocs, Elf_Size cbRelocs)
511	{
512	#if ELF_MODE != 32
513	NOREF(pu8SecBaseR);
514	#endif
515
516	/*
517	* Iterate the relocations.
518	* The relocations are stored in an array of Elf32_Rel records and covers the entire relocation section.
519	*/
520	const Elf_Reloc paRels = (const Elf_Reloc )pvRelocs;
521	const unsigned iRelMax = (unsigned)(cbRelocs / sizeof(paRels[0]));
522	AssertMsgReturn(iRelMax == cbRelocs / sizeof(paRels[0]), (FMT_ELF_SIZE "\n", cbRelocs / sizeof(paRels[0])), VERR_IMAGE_TOO_BIG);
523	for (unsigned iRel = 0; iRel < iRelMax; iRel++)
524	{
525	/*
526	* Skip R_XXX_NONE entries early to avoid confusion in the symbol
527	* getter code.
528	*/
529	#if ELF_MODE == 32
530	if (ELF_R_TYPE(paRels[iRel].r_info) == R_386_NONE)
531	continue;
532	#elif ELF_MODE == 64
533	if (ELF_R_TYPE(paRels[iRel].r_info) == R_X86_64_NONE)
534	continue;
535	#endif
536
537
538	/*
539	* Get the symbol.
540	*/
541	const Elf_Sym pSym = NULL; / shut up gcc */
542	Elf_Addr SymValue = 0; /* shut up gcc-4 */
543	int rc = RTLDRELF_NAME(Symbol)(pModElf, BaseAddr, pfnGetImport, pvUser, ELF_R_SYM(paRels[iRel].r_info), &pSym, &SymValue);
544	if (RT_FAILURE(rc))
545	return rc;
546
547	Log3(("rtldrELF: " FMT_ELF_ADDR " %02x %06x - " FMT_ELF_ADDR " %3d %02x %s\n",
548	paRels[iRel].r_offset, ELF_R_TYPE(paRels[iRel].r_info), (unsigned)ELF_R_SYM(paRels[iRel].r_info),
549	SymValue, (unsigned)pSym->st_shndx, pSym->st_info, ELF_STR(pModElf, pSym->st_name)));
550
551	/*
552	* Apply the fixup.
553	*/
554	AssertMsgReturn(paRels[iRel].r_offset < cbSec, (FMT_ELF_ADDR " " FMT_ELF_SIZE "\n", paRels[iRel].r_offset, cbSec), VERR_LDRELF_INVALID_RELOCATION_OFFSET);
555	#if ELF_MODE == 32
556	const Elf_Addr pAddrR = (const Elf_Addr )(pu8SecBaseR + paRels[iRel].r_offset); /* Where to read the addend. */
557	#endif
558	Elf_Addr pAddrW = (Elf_Addr )(pu8SecBaseW + paRels[iRel].r_offset); /* Where to write the fixup. */
559	switch (ELF_R_TYPE(paRels[iRel].r_info))
560	{
561	#if ELF_MODE == 32
562	/*
563	* Absolute addressing.
564	*/
565	case R_386_32:
566	{
567	const Elf_Addr Value = SymValue + *pAddrR;
568	(uint32_t )pAddrW = Value;
569	Log4((FMT_ELF_ADDR": R_386_32 Value=" FMT_ELF_ADDR " SymValue=" FMT_ELF_ADDR "\n",
570	SecAddr + paRels[iRel].r_offset + BaseAddr, Value, SymValue));
571	break;
572	}
573
574	/*
575	* PC relative addressing.
576	*/
577	case R_386_PC32:
578	{
579	const Elf_Addr SourceAddr = SecAddr + paRels[iRel].r_offset + BaseAddr; /* Where the source really is. */
580	const Elf_Addr Value = SymValue + (uint32_t )pAddrR - SourceAddr;
581	(uint32_t )pAddrW = Value;
582	Log4((FMT_ELF_ADDR": R_386_PC32 Value=" FMT_ELF_ADDR " SymValue=" FMT_ELF_ADDR "\n",
583	SourceAddr, Value, SymValue));
584	break;
585	}
586
587	/* ignore */
588	case R_386_NONE:
589	break;
590
591	#elif ELF_MODE == 64
592
593	/*
594	* Absolute addressing
595	*/
596	case R_X86_64_64:
597	{
598	const Elf_Addr Value = SymValue + paRels[iRel].r_addend;
599	(uint64_t )pAddrW = Value;
600	Log4((FMT_ELF_ADDR": R_X86_64_64 Value=" FMT_ELF_ADDR " SymValue=" FMT_ELF_ADDR "\n",
601	SecAddr + paRels[iRel].r_offset + BaseAddr, Value, SymValue));
602	break;
603	}
604
605	/*
606	* Truncated 32-bit value (zero-extendedable to the 64-bit value).
607	*/
608	case R_X86_64_32:
609	{
610	const Elf_Addr Value = SymValue + paRels[iRel].r_addend;
611	(uint32_t )pAddrW = (uint32_t)Value;
612	Log4((FMT_ELF_ADDR": R_X86_64_32 Value=" FMT_ELF_ADDR " SymValue=" FMT_ELF_ADDR "\n",
613	SecAddr + paRels[iRel].r_offset + BaseAddr, Value, SymValue));
614	AssertMsgReturn((Elf_Addr)(uint32_t )pAddrW == Value, ("Value=" FMT_ELF_ADDR "\n", Value), VERR_SYMBOL_VALUE_TOO_BIG);
615	break;
616	}
617
618	/*
619	* Truncated 32-bit value (sign-extendedable to the 64-bit value).
620	*/
621	case R_X86_64_32S:
622	{
623	const Elf_Addr Value = SymValue + paRels[iRel].r_addend;
624	(int32_t )pAddrW = (int32_t)Value;
625	Log4((FMT_ELF_ADDR": R_X86_64_32S Value=" FMT_ELF_ADDR " SymValue=" FMT_ELF_ADDR "\n",
626	SecAddr + paRels[iRel].r_offset + BaseAddr, Value, SymValue));
627	AssertMsgReturn((Elf_Addr)(int32_t )pAddrW == Value, ("Value=" FMT_ELF_ADDR "\n", Value), VERR_SYMBOL_VALUE_TOO_BIG); /** @todo check the sign-extending here. */
628	break;
629	}
630
631	/*
632	* PC relative addressing.
633	*/
634	case R_X86_64_PC32:
635	case R_X86_64_PLT32: /* binutils commit 451875b4f976a527395e9303224c7881b65e12ed feature/regression. */
636	{
637	const Elf_Addr SourceAddr = SecAddr + paRels[iRel].r_offset + BaseAddr; /* Where the source really is. */
638	const Elf_Addr Value = SymValue + paRels[iRel].r_addend - SourceAddr;
639	(int32_t )pAddrW = (int32_t)Value;
640	Log4((FMT_ELF_ADDR": R_X86_64_PC32 Value=" FMT_ELF_ADDR " SymValue=" FMT_ELF_ADDR "\n",
641	SourceAddr, Value, SymValue));
642	AssertMsgReturn((Elf_Addr)(int32_t )pAddrW == Value, ("Value=" FMT_ELF_ADDR "\n", Value), VERR_SYMBOL_VALUE_TOO_BIG); /** @todo check the sign-extending here. */
643	break;
644	}
645
646	/* ignore */
647	case R_X86_64_NONE:
648	break;
649	#endif
650
651	default:
652	AssertMsgFailed(("Unknown relocation type: %d (iRel=%d iRelMax=%d)\n",
653	ELF_R_TYPE(paRels[iRel].r_info), iRel, iRelMax));
654	return VERR_LDRELF_RELOCATION_NOT_SUPPORTED;
655	}
656	}
657
658	return VINF_SUCCESS;
659	}
660
661
662
663	/** @copydoc RTLDROPS::pfnClose */
664	static DECLCALLBACK(int) RTLDRELF_NAME(Close)(PRTLDRMODINTERNAL pMod)
665	{
666	PRTLDRMODELF pModElf = (PRTLDRMODELF)pMod;
667
668	if (pModElf->paShdrs)
669	{
670	RTMemFree(pModElf->paShdrs);
671	pModElf->paShdrs = NULL;
672	}
673
674	pModElf->pvBits = NULL;
675
676	return VINF_SUCCESS;
677	}
678
679
680	/** @copydoc RTLDROPS::Done */
681	static DECLCALLBACK(int) RTLDRELF_NAME(Done)(PRTLDRMODINTERNAL pMod)
682	{
683	NOREF(pMod); /PRTLDRMODELF pModElf = (PRTLDRMODELF)pMod;/
684	/** @todo Have to think more about this .... */
685	return -1;
686	}
687
688
689	/** @copydoc RTLDROPS::EnumSymbols */
690	static DECLCALLBACK(int) RTLDRELF_NAME(EnumSymbols)(PRTLDRMODINTERNAL pMod, unsigned fFlags, const void *pvBits, RTUINTPTR BaseAddress,
691	PFNRTLDRENUMSYMS pfnCallback, void *pvUser)
692	{
693	PRTLDRMODELF pModElf = (PRTLDRMODELF)pMod;
694	NOREF(pvBits);
695
696	/*
697	* Validate the input.
698	*/
699	Elf_Addr BaseAddr = (Elf_Addr)BaseAddress;
700	AssertMsgReturn((RTUINTPTR)BaseAddr == BaseAddress, ("%RTptr", BaseAddress), VERR_IMAGE_BASE_TOO_HIGH);
701
702	/*
703	* Make sure we've got the string and symbol tables. (We don't need the pvBits.)
704	*/
705	int rc = RTLDRELF_NAME(MapBits)(pModElf, false);
706	if (RT_FAILURE(rc))
707	return rc;
708
709	/*
710	* Enumerate the symbol table.
711	*/
712	const Elf_Sym *paSyms = pModElf->paSyms;
713	unsigned cSyms = pModElf->cSyms;
714	for (unsigned iSym = 1; iSym < cSyms; iSym++)
715	{
716	/*
717	* Skip imports (undefined).
718	*/
719	if (paSyms[iSym].st_shndx != SHN_UNDEF)
720	{
721	/*
722	* Calc value and get name.
723	*/
724	Elf_Addr Value;
725	if (paSyms[iSym].st_shndx == SHN_ABS)
726	/* absolute symbols are not subject to any relocation. */
727	Value = paSyms[iSym].st_value;
728	else if (paSyms[iSym].st_shndx < pModElf->Ehdr.e_shnum)
729	{
730	if (pModElf->Ehdr.e_type == ET_REL)
731	/* relative to the section. */
732	Value = BaseAddr + paSyms[iSym].st_value + pModElf->paShdrs[paSyms[iSym].st_shndx].sh_addr;
733	else /* Fixed up for link address. */
734	Value = BaseAddr + paSyms[iSym].st_value - pModElf->LinkAddress;
735	}
736	else
737	{
738	AssertMsgFailed(("Arg! paSyms[%u].st_shndx=" FMT_ELF_HALF "\n", iSym, paSyms[iSym].st_shndx));
739	return VERR_BAD_EXE_FORMAT;
740	}
741	const char *pszName = ELF_STR(pModElf, paSyms[iSym].st_name);
742	if ( (pszName && *pszName)
743	&& ( (fFlags & RTLDR_ENUM_SYMBOL_FLAGS_ALL)
744	\|\| ELF_ST_BIND(paSyms[iSym].st_info) == STB_GLOBAL)
745	)
746	{
747	/*
748	* Call back.
749	*/
750	AssertMsgReturn(Value == (RTUINTPTR)Value, (FMT_ELF_ADDR "\n", Value), VERR_SYMBOL_VALUE_TOO_BIG);
751	rc = pfnCallback(pMod, pszName, ~0U, (RTUINTPTR)Value, pvUser);
752	if (rc)
753	return rc;
754	}
755	}
756	}
757
758	return VINF_SUCCESS;
759	}
760
761
762	/** @copydoc RTLDROPS::GetImageSize */
763	static DECLCALLBACK(size_t) RTLDRELF_NAME(GetImageSize)(PRTLDRMODINTERNAL pMod)
764	{
765	PRTLDRMODELF pModElf = (PRTLDRMODELF)pMod;
766
767	return pModElf->cbImage;
768	}
769
770
771	/** @copydoc RTLDROPS::GetBits */
772	static DECLCALLBACK(int) RTLDRELF_NAME(GetBits)(PRTLDRMODINTERNAL pMod, void pvBits, RTUINTPTR BaseAddress, PFNRTLDRIMPORT pfnGetImport, void pvUser)
773	{
774	PRTLDRMODELF pModElf = (PRTLDRMODELF)pMod;
775
776	/*
777	* This operation is currently only available on relocatable images.
778	*/
779	switch (pModElf->Ehdr.e_type)
780	{
781	case ET_REL:
782	break;
783	case ET_EXEC:
784	Log(("RTLdrELF: %s: Executable images are not supported yet!\n", pModElf->Core.pReader->pfnLogName(pModElf->Core.pReader)));
785	return VERR_LDRELF_EXEC;
786	case ET_DYN:
787	Log(("RTLdrELF: %s: Dynamic images are not supported yet!\n", pModElf->Core.pReader->pfnLogName(pModElf->Core.pReader)));
788	return VERR_LDRELF_DYN;
789	default: AssertFailedReturn(VERR_BAD_EXE_FORMAT);
790	}
791
792	/*
793	* Load the bits into pvBits.
794	*/
795	const Elf_Shdr *paShdrs = pModElf->paShdrs;
796	for (unsigned iShdr = 0; iShdr < pModElf->Ehdr.e_shnum; iShdr++)
797	{
798	if (paShdrs[iShdr].sh_flags & SHF_ALLOC)
799	{
800	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);
801	switch (paShdrs[iShdr].sh_type)
802	{
803	case SHT_NOBITS:
804	memset((uint8_t *)pvBits + paShdrs[iShdr].sh_addr, 0, (size_t)paShdrs[iShdr].sh_size);
805	break;
806
807	case SHT_PROGBITS:
808	default:
809	{
810	int rc = pModElf->Core.pReader->pfnRead(pModElf->Core.pReader, (uint8_t *)pvBits + paShdrs[iShdr].sh_addr,
811	(size_t)paShdrs[iShdr].sh_size, paShdrs[iShdr].sh_offset);
812	if (RT_FAILURE(rc))
813	{
814	Log(("RTLdrELF: %s: Read error when reading " FMT_ELF_SIZE " bytes at " FMT_ELF_OFF ", iShdr=%d\n",
815	pModElf->Core.pReader->pfnLogName(pModElf->Core.pReader),
816	paShdrs[iShdr].sh_size, paShdrs[iShdr].sh_offset, iShdr));
817	return rc;
818	}
819	}
820	}
821	}
822	}
823
824	/*
825	* Relocate the image.
826	*/
827	return pModElf->Core.pOps->pfnRelocate(pMod, pvBits, BaseAddress, ~(RTUINTPTR)0, pfnGetImport, pvUser);
828	}
829
830
831	/** @copydoc RTLDROPS::Relocate */
832	static DECLCALLBACK(int) RTLDRELF_NAME(Relocate)(PRTLDRMODINTERNAL pMod, void *pvBits, RTUINTPTR NewBaseAddress,
833	RTUINTPTR OldBaseAddress, PFNRTLDRIMPORT pfnGetImport, void *pvUser)
834	{
835	PRTLDRMODELF pModElf = (PRTLDRMODELF)pMod;
836	#ifdef LOG_ENABLED
837	const char *pszLogName = pModElf->Core.pReader->pfnLogName(pModElf->Core.pReader);
838	#endif
839	NOREF(OldBaseAddress);
840
841	/*
842	* This operation is currently only available on relocatable images.
843	*/
844	switch (pModElf->Ehdr.e_type)
845	{
846	case ET_REL:
847	break;
848	case ET_EXEC:
849	Log(("RTLdrELF: %s: Executable images are not supported yet!\n", pszLogName));
850	return VERR_LDRELF_EXEC;
851	case ET_DYN:
852	Log(("RTLdrELF: %s: Dynamic images are not supported yet!\n", pszLogName));
853	return VERR_LDRELF_DYN;
854	default: AssertFailedReturn(VERR_BAD_EXE_FORMAT);
855	}
856
857	/*
858	* Validate the input.
859	*/
860	Elf_Addr BaseAddr = (Elf_Addr)NewBaseAddress;
861	AssertMsgReturn((RTUINTPTR)BaseAddr == NewBaseAddress, ("%RTptr", NewBaseAddress), VERR_IMAGE_BASE_TOO_HIGH);
862
863	/*
864	* Map the image bits if not already done and setup pointer into it.
865	*/
866	int rc = RTLDRELF_NAME(MapBits)(pModElf, true);
867	if (RT_FAILURE(rc))
868	return rc;
869
870	/*
871	* Iterate the sections looking for interesting SHT_REL[A] sections.
872	* SHT_REL[A] sections have the section index of the section they contain fixups
873	* for in the sh_info member.
874	*/
875	const Elf_Shdr *paShdrs = pModElf->paShdrs;
876	Log2(("rtLdrElf: %s: Fixing up image\n", pszLogName));
877	for (unsigned iShdr = 0; iShdr < pModElf->Ehdr.e_shnum; iShdr++)
878	{
879	const Elf_Shdr *pShdrRel = &paShdrs[iShdr];
880
881	/*
882	* Skip sections without interest to us.
883	*/
884	#if ELF_MODE == 32
885	if (pShdrRel->sh_type != SHT_REL)
886	#else
887	if (pShdrRel->sh_type != SHT_RELA)
888	#endif
889	continue;
890	if (pShdrRel->sh_info >= pModElf->Ehdr.e_shnum)
891	continue;
892	const Elf_Shdr pShdr = &paShdrs[pShdrRel->sh_info]; / the section to fixup. */
893	if (!(pShdr->sh_flags & SHF_ALLOC))
894	continue;
895
896	/*
897	* Relocate the section.
898	*/
899	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",
900	pszLogName, (int)pShdrRel->sh_info, ELF_SH_STR(pModElf, pShdr->sh_name), (int)pShdr->sh_info, (int)pShdr->sh_link,
901	iShdr, ELF_SH_STR(pModElf, pShdrRel->sh_name), (int)pShdrRel->sh_info, (int)pShdrRel->sh_link));
902
903	/** @todo Make RelocateSection a function pointer so we can select the one corresponding to the machine when opening the image. */
904	if (pModElf->Ehdr.e_type == ET_REL)
905	rc = RTLDRELF_NAME(RelocateSection)(pModElf, BaseAddr, pfnGetImport, pvUser,
906	pShdr->sh_addr,
907	pShdr->sh_size,
908	(const uint8_t *)pModElf->pvBits + pShdr->sh_offset,
909	(uint8_t *)pvBits + pShdr->sh_addr,
910	(const uint8_t *)pModElf->pvBits + pShdrRel->sh_offset,
911	pShdrRel->sh_size);
912	else
913	rc = RTLDRELF_NAME(RelocateSectionExecDyn)(pModElf, BaseAddr, pfnGetImport, pvUser,
914	pShdr->sh_addr,
915	pShdr->sh_size,
916	(const uint8_t *)pModElf->pvBits + pShdr->sh_offset,
917	(uint8_t *)pvBits + pShdr->sh_addr,
918	(const uint8_t *)pModElf->pvBits + pShdrRel->sh_offset,
919	pShdrRel->sh_size);
920	if (RT_FAILURE(rc))
921	return rc;
922	}
923	return VINF_SUCCESS;
924	}
925
926
927	/**
928	* Worker for pfnGetSymbolEx.
929	*/
930	static int RTLDRELF_NAME(ReturnSymbol)(PRTLDRMODELF pThis, const Elf_Sym *pSym, Elf_Addr uBaseAddr, PRTUINTPTR pValue)
931	{
932	Elf_Addr Value;
933	if (pSym->st_shndx == SHN_ABS)
934	/* absolute symbols are not subject to any relocation. */
935	Value = pSym->st_value;
936	else if (pSym->st_shndx < pThis->Ehdr.e_shnum)
937	{
938	if (pThis->Ehdr.e_type == ET_REL)
939	/* relative to the section. */
940	Value = uBaseAddr + pSym->st_value + pThis->paShdrs[pSym->st_shndx].sh_addr;
941	else /* Fixed up for link address. */
942	Value = uBaseAddr + pSym->st_value - pThis->LinkAddress;
943	}
944	else
945	{
946	AssertMsgFailed(("Arg! pSym->st_shndx=%d\n", pSym->st_shndx));
947	return VERR_BAD_EXE_FORMAT;
948	}
949	AssertMsgReturn(Value == (RTUINTPTR)Value, (FMT_ELF_ADDR "\n", Value), VERR_SYMBOL_VALUE_TOO_BIG);
950	*pValue = (RTUINTPTR)Value;
951	return VINF_SUCCESS;
952	}
953
954
955	/** @copydoc RTLDROPS::pfnGetSymbolEx */
956	static DECLCALLBACK(int) RTLDRELF_NAME(GetSymbolEx)(PRTLDRMODINTERNAL pMod, const void *pvBits, RTUINTPTR BaseAddress,
957	uint32_t iOrdinal, const char pszSymbol, RTUINTPTR pValue)
958	{
959	PRTLDRMODELF pModElf = (PRTLDRMODELF)pMod;
960	NOREF(pvBits);
961
962	/*
963	* Validate the input.
964	*/
965	Elf_Addr uBaseAddr = (Elf_Addr)BaseAddress;
966	AssertMsgReturn((RTUINTPTR)uBaseAddr == BaseAddress, ("%RTptr", BaseAddress), VERR_IMAGE_BASE_TOO_HIGH);
967
968	/*
969	* Map the image bits if not already done and setup pointer into it.
970	*/
971	int rc = RTLDRELF_NAME(MapBits)(pModElf, true);
972	if (RT_FAILURE(rc))
973	return rc;
974
975	/*
976	* Calc all kinds of pointers before we start iterating the symbol table.
977	*/
978	const Elf_Sym *paSyms = pModElf->paSyms;
979	unsigned cSyms = pModElf->cSyms;
980	if (iOrdinal == UINT32_MAX)
981	{
982	const char *pStr = pModElf->pStr;
983	for (unsigned iSym = 1; iSym < cSyms; iSym++)
984	{
985	/* Undefined symbols are not exports, they are imports. */
986	if ( paSyms[iSym].st_shndx != SHN_UNDEF
987	&& ( ELF_ST_BIND(paSyms[iSym].st_info) == STB_GLOBAL
988	\|\| ELF_ST_BIND(paSyms[iSym].st_info) == STB_WEAK))
989	{
990	/* Validate the name string and try match with it. */
991	if (paSyms[iSym].st_name < pModElf->cbStr)
992	{
993	if (!strcmp(pszSymbol, pStr + paSyms[iSym].st_name))
994	{
995	/* matched! */
996	return RTLDRELF_NAME(ReturnSymbol)(pModElf, &paSyms[iSym], uBaseAddr, pValue);
997	}
998	}
999	else
1000	{
1001	AssertMsgFailed(("String outside string table! iSym=%d paSyms[iSym].st_name=%#x\n", iSym, paSyms[iSym].st_name));
1002	return VERR_LDRELF_INVALID_SYMBOL_NAME_OFFSET;
1003	}
1004	}
1005	}
1006	}
1007	else if (iOrdinal < cSyms)
1008	{
1009	if ( paSyms[iOrdinal].st_shndx != SHN_UNDEF
1010	&& ( ELF_ST_BIND(paSyms[iOrdinal].st_info) == STB_GLOBAL
1011	\|\| ELF_ST_BIND(paSyms[iOrdinal].st_info) == STB_WEAK))
1012	return RTLDRELF_NAME(ReturnSymbol)(pModElf, &paSyms[iOrdinal], uBaseAddr, pValue);
1013	}
1014
1015	return VERR_SYMBOL_NOT_FOUND;
1016	}
1017
1018
1019	/** @copydoc RTLDROPS::pfnEnumDbgInfo */
1020	static DECLCALLBACK(int) RTLDRELF_NAME(EnumDbgInfo)(PRTLDRMODINTERNAL pMod, const void *pvBits,
1021	PFNRTLDRENUMDBG pfnCallback, void *pvUser)
1022	{
1023	PRTLDRMODELF pModElf = (PRTLDRMODELF)pMod;
1024	RT_NOREF_PV(pvBits);
1025
1026	/*
1027	* Map the image bits if not already done and setup pointer into it.
1028	*/
1029	int rc = RTLDRELF_NAME(MapBits)(pModElf, true);
1030	if (RT_FAILURE(rc))
1031	return rc;
1032
1033	/*
1034	* Do the enumeration.
1035	*/
1036	const Elf_Shdr *paShdrs = pModElf->paOrgShdrs;
1037	for (unsigned iShdr = 0; iShdr < pModElf->Ehdr.e_shnum; iShdr++)
1038	{
1039	/* Debug sections are expected to be PROGBITS and not allocated. */
1040	if (paShdrs[iShdr].sh_type != SHT_PROGBITS)
1041	continue;
1042	if (paShdrs[iShdr].sh_flags & SHF_ALLOC)
1043	continue;
1044
1045	RTLDRDBGINFO DbgInfo;
1046	const char *pszSectName = ELF_SH_STR(pModElf, paShdrs[iShdr].sh_name);
1047	if ( !strncmp(pszSectName, RT_STR_TUPLE(".debug_"))
1048	\|\| !strcmp(pszSectName, ".WATCOM_references") )
1049	{
1050	RT_ZERO(DbgInfo.u);
1051	DbgInfo.enmType = RTLDRDBGINFOTYPE_DWARF;
1052	DbgInfo.pszExtFile = NULL;
1053	DbgInfo.offFile = paShdrs[iShdr].sh_offset;
1054	DbgInfo.cb = paShdrs[iShdr].sh_size;
1055	DbgInfo.u.Dwarf.pszSection = pszSectName;
1056	}
1057	else if (!strcmp(pszSectName, ".gnu_debuglink"))
1058	{
1059	if ((paShdrs[iShdr].sh_size & 3) \|\| paShdrs[iShdr].sh_size < 8)
1060	return VERR_BAD_EXE_FORMAT;
1061
1062	RT_ZERO(DbgInfo.u);
1063	DbgInfo.enmType = RTLDRDBGINFOTYPE_DWARF_DWO;
1064	DbgInfo.pszExtFile = (const char *)((uintptr_t)pModElf->pvBits + (uintptr_t)paShdrs[iShdr].sh_offset);
1065	if (!RTStrEnd(DbgInfo.pszExtFile, paShdrs[iShdr].sh_size))
1066	return VERR_BAD_EXE_FORMAT;
1067	DbgInfo.u.Dwo.uCrc32 = (uint32_t )((uintptr_t)DbgInfo.pszExtFile + (uintptr_t)paShdrs[iShdr].sh_size
1068	- sizeof(uint32_t));
1069	DbgInfo.offFile = -1;
1070	DbgInfo.cb = 0;
1071	}
1072	else
1073	continue;
1074
1075	DbgInfo.LinkAddress = NIL_RTLDRADDR;
1076	DbgInfo.iDbgInfo = iShdr - 1;
1077
1078	rc = pfnCallback(pMod, &DbgInfo, pvUser);
1079	if (rc != VINF_SUCCESS)
1080	return rc;
1081
1082	}
1083
1084	return VINF_SUCCESS;
1085	}
1086
1087
1088	/**
1089	* Helper that locates the first allocated section.
1090	*
1091	* @returns Pointer to the section header if found, NULL if none.
1092	* @param pShdr The section header to start searching at.
1093	* @param cLeft The number of section headers left to search. Can be 0.
1094	*/
1095	static const Elf_Shdr RTLDRELF_NAME(GetFirstAllocatedSection)(const Elf_Shdr pShdr, unsigned cLeft)
1096	{
1097	while (cLeft-- > 0)
1098	{
1099	if (pShdr->sh_flags & SHF_ALLOC)
1100	return pShdr;
1101	pShdr++;
1102	}
1103	return NULL;
1104	}
1105
1106	/** @copydoc RTLDROPS::pfnEnumSegments. */
1107	static DECLCALLBACK(int) RTLDRELF_NAME(EnumSegments)(PRTLDRMODINTERNAL pMod, PFNRTLDRENUMSEGS pfnCallback, void *pvUser)
1108	{
1109	PRTLDRMODELF pModElf = (PRTLDRMODELF)pMod;
1110
1111	/*
1112	* Map the image bits if not already done and setup pointer into it.
1113	*/
1114	int rc = RTLDRELF_NAME(MapBits)(pModElf, true);
1115	if (RT_FAILURE(rc))
1116	return rc;
1117
1118	/*
1119	* Do the enumeration.
1120	*/
1121	char szName[32];
1122	Elf_Addr uPrevMappedRva = 0;
1123	const Elf_Shdr *paShdrs = pModElf->paShdrs;
1124	const Elf_Shdr *paOrgShdrs = pModElf->paOrgShdrs;
1125	for (unsigned iShdr = 1; iShdr < pModElf->Ehdr.e_shnum; iShdr++)
1126	{
1127	RTLDRSEG Seg;
1128	Seg.pszName = ELF_SH_STR(pModElf, paShdrs[iShdr].sh_name);
1129	Seg.cchName = (uint32_t)strlen(Seg.pszName);
1130	if (Seg.cchName == 0)
1131	{
1132	Seg.pszName = szName;
1133	Seg.cchName = (uint32_t)RTStrPrintf(szName, sizeof(szName), "UnamedSect%02u", iShdr);
1134	}
1135	Seg.SelFlat = 0;
1136	Seg.Sel16bit = 0;
1137	Seg.fFlags = 0;
1138	Seg.fProt = RTMEM_PROT_READ;
1139	if (paShdrs[iShdr].sh_flags & SHF_WRITE)
1140	Seg.fProt \|= RTMEM_PROT_WRITE;
1141	if (paShdrs[iShdr].sh_flags & SHF_EXECINSTR)
1142	Seg.fProt \|= RTMEM_PROT_EXEC;
1143	Seg.cb = paShdrs[iShdr].sh_size;
1144	Seg.Alignment = paShdrs[iShdr].sh_addralign;
1145	if (paShdrs[iShdr].sh_flags & SHF_ALLOC)
1146	{
1147	Seg.LinkAddress = paOrgShdrs[iShdr].sh_addr;
1148	Seg.RVA = paShdrs[iShdr].sh_addr;
1149	const Elf_Shdr *pShdr2 = RTLDRELF_NAME(GetFirstAllocatedSection)(&paShdrs[iShdr + 1],
1150	pModElf->Ehdr.e_shnum - iShdr - 1);
1151	if ( pShdr2
1152	&& pShdr2->sh_addr >= paShdrs[iShdr].sh_addr
1153	&& Seg.RVA >= uPrevMappedRva)
1154	Seg.cbMapped = pShdr2->sh_addr - paShdrs[iShdr].sh_addr;
1155	else
1156	Seg.cbMapped = RT_MAX(paShdrs[iShdr].sh_size, paShdrs[iShdr].sh_addralign);
1157	uPrevMappedRva = Seg.RVA;
1158	}
1159	else
1160	{
1161	Seg.LinkAddress = NIL_RTLDRADDR;
1162	Seg.RVA = NIL_RTLDRADDR;
1163	Seg.cbMapped = NIL_RTLDRADDR;
1164	}
1165	if (paShdrs[iShdr].sh_type != SHT_NOBITS)
1166	{
1167	Seg.offFile = paShdrs[iShdr].sh_offset;
1168	Seg.cbFile = paShdrs[iShdr].sh_size;
1169	}
1170	else
1171	{
1172	Seg.offFile = -1;
1173	Seg.cbFile = 0;
1174	}
1175
1176	rc = pfnCallback(pMod, &Seg, pvUser);
1177	if (rc != VINF_SUCCESS)
1178	return rc;
1179	}
1180
1181	return VINF_SUCCESS;
1182	}
1183
1184
1185	/** @copydoc RTLDROPS::pfnLinkAddressToSegOffset. */
1186	static DECLCALLBACK(int) RTLDRELF_NAME(LinkAddressToSegOffset)(PRTLDRMODINTERNAL pMod, RTLDRADDR LinkAddress,
1187	uint32_t *piSeg, PRTLDRADDR poffSeg)
1188	{
1189	PRTLDRMODELF pModElf = (PRTLDRMODELF)pMod;
1190
1191	const Elf_Shdr *pShdrEnd = NULL;
1192	unsigned cLeft = pModElf->Ehdr.e_shnum - 1;
1193	const Elf_Shdr *pShdr = &pModElf->paOrgShdrs[cLeft];
1194	while (cLeft-- > 0)
1195	{
1196	if (pShdr->sh_flags & SHF_ALLOC)
1197	{
1198	RTLDRADDR offSeg = LinkAddress - pShdr->sh_addr;
1199	if (offSeg < pShdr->sh_size)
1200	{
1201	*poffSeg = offSeg;
1202	*piSeg = cLeft;
1203	return VINF_SUCCESS;
1204	}
1205	if (offSeg == pShdr->sh_size)
1206	pShdrEnd = pShdr;
1207	}
1208	pShdr--;
1209	}
1210
1211	if (pShdrEnd)
1212	{
1213	*poffSeg = pShdrEnd->sh_size;
1214	*piSeg = pShdrEnd - pModElf->paOrgShdrs - 1;
1215	return VINF_SUCCESS;
1216	}
1217
1218	return VERR_LDR_INVALID_LINK_ADDRESS;
1219	}
1220
1221
1222	/** @copydoc RTLDROPS::pfnLinkAddressToRva. */
1223	static DECLCALLBACK(int) RTLDRELF_NAME(LinkAddressToRva)(PRTLDRMODINTERNAL pMod, RTLDRADDR LinkAddress, PRTLDRADDR pRva)
1224	{
1225	PRTLDRMODELF pModElf = (PRTLDRMODELF)pMod;
1226	uint32_t iSeg;
1227	RTLDRADDR offSeg;
1228	int rc = RTLDRELF_NAME(LinkAddressToSegOffset)(pMod, LinkAddress, &iSeg, &offSeg);
1229	if (RT_SUCCESS(rc))
1230	*pRva = pModElf->paShdrs[iSeg + 1].sh_addr + offSeg;
1231	return rc;
1232	}
1233
1234
1235	/** @copydoc RTLDROPS::pfnSegOffsetToRva. */
1236	static DECLCALLBACK(int) RTLDRELF_NAME(SegOffsetToRva)(PRTLDRMODINTERNAL pMod, uint32_t iSeg, RTLDRADDR offSeg,
1237	PRTLDRADDR pRva)
1238	{
1239	PRTLDRMODELF pModElf = (PRTLDRMODELF)pMod;
1240	if (iSeg >= pModElf->Ehdr.e_shnum - 1U)
1241	return VERR_LDR_INVALID_SEG_OFFSET;
1242
1243	iSeg++; /* skip section 0 */
1244	if (offSeg > pModElf->paShdrs[iSeg].sh_size)
1245	{
1246	const Elf_Shdr *pShdr2 = RTLDRELF_NAME(GetFirstAllocatedSection)(&pModElf->paShdrs[iSeg + 1],
1247	pModElf->Ehdr.e_shnum - iSeg - 1);
1248	if ( !pShdr2
1249	\|\| offSeg > (pShdr2->sh_addr - pModElf->paShdrs[iSeg].sh_addr))
1250	return VERR_LDR_INVALID_SEG_OFFSET;
1251	}
1252
1253	if (!(pModElf->paShdrs[iSeg].sh_flags & SHF_ALLOC))
1254	return VERR_LDR_INVALID_SEG_OFFSET;
1255
1256	*pRva = pModElf->paShdrs[iSeg].sh_addr;
1257	return VINF_SUCCESS;
1258	}
1259
1260
1261	/** @copydoc RTLDROPS::pfnRvaToSegOffset. */
1262	static DECLCALLBACK(int) RTLDRELF_NAME(RvaToSegOffset)(PRTLDRMODINTERNAL pMod, RTLDRADDR Rva,
1263	uint32_t *piSeg, PRTLDRADDR poffSeg)
1264	{
1265	PRTLDRMODELF pModElf = (PRTLDRMODELF)pMod;
1266
1267	Elf_Addr PrevAddr = 0;
1268	unsigned cLeft = pModElf->Ehdr.e_shnum - 1;
1269	const Elf_Shdr *pShdr = &pModElf->paShdrs[cLeft];
1270	while (cLeft-- > 0)
1271	{
1272	if (pShdr->sh_flags & SHF_ALLOC)
1273	{
1274	Elf_Addr cbSeg = PrevAddr ? PrevAddr - pShdr->sh_addr : pShdr->sh_size;
1275	RTLDRADDR offSeg = Rva - pShdr->sh_addr;
1276	if (offSeg <= cbSeg)
1277	{
1278	*poffSeg = offSeg;
1279	*piSeg = cLeft;
1280	return VINF_SUCCESS;
1281	}
1282	PrevAddr = pShdr->sh_addr;
1283	}
1284	pShdr--;
1285	}
1286
1287	return VERR_LDR_INVALID_RVA;
1288	}
1289
1290
1291	/** @callback_method_impl{FNRTLDRIMPORT, Stub used by ReadDbgInfo.} */
1292	static DECLCALLBACK(int) RTLDRELF_NAME(GetImportStubCallback)(RTLDRMOD hLdrMod, const char pszModule, const char pszSymbol,
1293	unsigned uSymbol, PRTLDRADDR pValue, void *pvUser)
1294	{
1295	RT_NOREF_PV(hLdrMod); RT_NOREF_PV(pszModule); RT_NOREF_PV(pszSymbol);
1296	RT_NOREF_PV(uSymbol); RT_NOREF_PV(pValue); RT_NOREF_PV(pvUser);
1297	return VERR_SYMBOL_NOT_FOUND;
1298	}
1299
1300
1301	/** @copydoc RTLDROPS::pfnRvaToSegOffset. */
1302	static DECLCALLBACK(int) RTLDRELF_NAME(ReadDbgInfo)(PRTLDRMODINTERNAL pMod, uint32_t iDbgInfo, RTFOFF off,
1303	size_t cb, void *pvBuf)
1304	{
1305	PRTLDRMODELF pThis = (PRTLDRMODELF)pMod;
1306	LogFlow(("%s: iDbgInfo=%#x off=%RTfoff cb=%#zu\n", __FUNCTION__, iDbgInfo, off, cb));
1307
1308	/*
1309	* Input validation.
1310	*/
1311	AssertReturn(iDbgInfo < pThis->Ehdr.e_shnum && iDbgInfo + 1 < pThis->Ehdr.e_shnum, VERR_INVALID_PARAMETER);
1312	iDbgInfo++;
1313	AssertReturn(!(pThis->paShdrs[iDbgInfo].sh_flags & SHF_ALLOC), VERR_INVALID_PARAMETER);
1314	AssertReturn(pThis->paShdrs[iDbgInfo].sh_type == SHT_PROGBITS, VERR_INVALID_PARAMETER);
1315	AssertReturn(pThis->paShdrs[iDbgInfo].sh_offset == (uint64_t)off, VERR_INVALID_PARAMETER);
1316	AssertReturn(pThis->paShdrs[iDbgInfo].sh_size == cb, VERR_INVALID_PARAMETER);
1317	RTFOFF cbRawImage = pThis->Core.pReader->pfnSize(pThis->Core.pReader);
1318	AssertReturn(cbRawImage >= 0, VERR_INVALID_PARAMETER);
1319	AssertReturn(off >= 0 && cb <= (uint64_t)cbRawImage && (uint64_t)off + cb <= (uint64_t)cbRawImage, VERR_INVALID_PARAMETER);
1320
1321	/*
1322	* Read it from the file and look for fixup sections.
1323	*/
1324	int rc;
1325	if (pThis->pvBits)
1326	memcpy(pvBuf, (const uint8_t *)pThis->pvBits + (size_t)off, cb);
1327	else
1328	{
1329	rc = pThis->Core.pReader->pfnRead(pThis->Core.pReader, pvBuf, cb, off);
1330	if (RT_FAILURE(rc))
1331	return rc;
1332	}
1333
1334	uint32_t iRelocs = iDbgInfo + 1;
1335	if ( iRelocs >= pThis->Ehdr.e_shnum
1336	\|\| pThis->paShdrs[iRelocs].sh_info != iDbgInfo
1337	\|\| ( pThis->paShdrs[iRelocs].sh_type != SHT_REL
1338	&& pThis->paShdrs[iRelocs].sh_type != SHT_RELA) )
1339	{
1340	iRelocs = 0;
1341	while ( iRelocs < pThis->Ehdr.e_shnum
1342	&& ( pThis->paShdrs[iRelocs].sh_info != iDbgInfo
1343	\|\| ( pThis->paShdrs[iRelocs].sh_type != SHT_REL
1344	&& pThis->paShdrs[iRelocs].sh_type != SHT_RELA)) )
1345	iRelocs++;
1346	}
1347	if ( iRelocs < pThis->Ehdr.e_shnum
1348	&& pThis->paShdrs[iRelocs].sh_size > 0)
1349	{
1350	/*
1351	* Load the relocations.
1352	*/
1353	uint8_t *pbRelocsBuf = NULL;
1354	const uint8_t *pbRelocs;
1355	if (pThis->pvBits)
1356	pbRelocs = (const uint8_t *)pThis->pvBits + pThis->paShdrs[iRelocs].sh_offset;
1357	else
1358	{
1359	pbRelocs = pbRelocsBuf = (uint8_t *)RTMemTmpAlloc(pThis->paShdrs[iRelocs].sh_size);
1360	if (!pbRelocsBuf)
1361	return VERR_NO_TMP_MEMORY;
1362	rc = pThis->Core.pReader->pfnRead(pThis->Core.pReader, pbRelocsBuf,
1363	pThis->paShdrs[iRelocs].sh_size,
1364	pThis->paShdrs[iRelocs].sh_offset);
1365	if (RT_FAILURE(rc))
1366	{
1367	RTMemTmpFree(pbRelocsBuf);
1368	return rc;
1369	}
1370	}
1371
1372	/*
1373	* Apply the relocations.
1374	*/
1375	if (pThis->Ehdr.e_type == ET_REL)
1376	rc = RTLDRELF_NAME(RelocateSection)(pThis, pThis->LinkAddress,
1377	RTLDRELF_NAME(GetImportStubCallback), NULL /pvUser/,
1378	pThis->paShdrs[iDbgInfo].sh_addr,
1379	pThis->paShdrs[iDbgInfo].sh_size,
1380	(const uint8_t *)pvBuf,
1381	(uint8_t *)pvBuf,
1382	pbRelocs,
1383	pThis->paShdrs[iRelocs].sh_size);
1384	else
1385	rc = RTLDRELF_NAME(RelocateSectionExecDyn)(pThis, pThis->LinkAddress,
1386	RTLDRELF_NAME(GetImportStubCallback), NULL /pvUser/,
1387	pThis->paShdrs[iDbgInfo].sh_addr,
1388	pThis->paShdrs[iDbgInfo].sh_size,
1389	(const uint8_t *)pvBuf,
1390	(uint8_t *)pvBuf,
1391	pbRelocs,
1392	pThis->paShdrs[iRelocs].sh_size);
1393
1394	RTMemTmpFree(pbRelocsBuf);
1395	}
1396	else
1397	rc = VINF_SUCCESS;
1398	return rc;
1399	}
1400
1401
1402
1403	/**
1404	* The ELF module operations.
1405	*/
1406	static RTLDROPS RTLDRELF_MID(s_rtldrElf,Ops) =
1407	{
1408	#if ELF_MODE == 32
1409	"elf32",
1410	#elif ELF_MODE == 64
1411	"elf64",
1412	#endif
1413	RTLDRELF_NAME(Close),
1414	NULL, /* Get Symbol */
1415	RTLDRELF_NAME(Done),
1416	RTLDRELF_NAME(EnumSymbols),
1417	/* ext: */
1418	RTLDRELF_NAME(GetImageSize),
1419	RTLDRELF_NAME(GetBits),
1420	RTLDRELF_NAME(Relocate),
1421	RTLDRELF_NAME(GetSymbolEx),
1422	NULL /pfnQueryForwarderInfo/,
1423	RTLDRELF_NAME(EnumDbgInfo),
1424	RTLDRELF_NAME(EnumSegments),
1425	RTLDRELF_NAME(LinkAddressToSegOffset),
1426	RTLDRELF_NAME(LinkAddressToRva),
1427	RTLDRELF_NAME(SegOffsetToRva),
1428	RTLDRELF_NAME(RvaToSegOffset),
1429	RTLDRELF_NAME(ReadDbgInfo),
1430	NULL /pfnQueryProp/,
1431	NULL /pfnVerifySignature/,
1432	NULL /pfnHashImage/,
1433	NULL /pfnUnwindFrame/,
1434	42
1435	};
1436
1437
1438
1439	/**
1440	* Validates the ELF header.
1441	*
1442	* @returns iprt status code.
1443	* @param pEhdr Pointer to the ELF header.
1444	* @param pszLogName The log name.
1445	* @param cbRawImage The size of the raw image.
1446	*/
1447	static int RTLDRELF_NAME(ValidateElfHeader)(const Elf_Ehdr pEhdr, const char pszLogName, uint64_t cbRawImage,
1448	PRTLDRARCH penmArch)
1449	{
1450	Log3(("RTLdrELF: e_ident: %.*Rhxs\n"
1451	"RTLdrELF: e_type: " FMT_ELF_HALF "\n"
1452	"RTLdrELF: e_version: " FMT_ELF_HALF "\n"
1453	"RTLdrELF: e_entry: " FMT_ELF_ADDR "\n"
1454	"RTLdrELF: e_phoff: " FMT_ELF_OFF "\n"
1455	"RTLdrELF: e_shoff: " FMT_ELF_OFF "\n"
1456	"RTLdrELF: e_flags: " FMT_ELF_WORD "\n"
1457	"RTLdrELF: e_ehsize: " FMT_ELF_HALF "\n"
1458	"RTLdrELF: e_phentsize: " FMT_ELF_HALF "\n"
1459	"RTLdrELF: e_phnum: " FMT_ELF_HALF "\n"
1460	"RTLdrELF: e_shentsize: " FMT_ELF_HALF "\n"
1461	"RTLdrELF: e_shnum: " FMT_ELF_HALF "\n"
1462	"RTLdrELF: e_shstrndx: " FMT_ELF_HALF "\n",
1463	RT_ELEMENTS(pEhdr->e_ident), &pEhdr->e_ident[0], pEhdr->e_type, pEhdr->e_version,
1464	pEhdr->e_entry, pEhdr->e_phoff, pEhdr->e_shoff,pEhdr->e_flags, pEhdr->e_ehsize, pEhdr->e_phentsize,
1465	pEhdr->e_phnum, pEhdr->e_shentsize, pEhdr->e_shnum, pEhdr->e_shstrndx));
1466
1467	if ( pEhdr->e_ident[EI_MAG0] != ELFMAG0
1468	\|\| pEhdr->e_ident[EI_MAG1] != ELFMAG1
1469	\|\| pEhdr->e_ident[EI_MAG2] != ELFMAG2
1470	\|\| pEhdr->e_ident[EI_MAG3] != ELFMAG3
1471	)
1472	{
1473	Log(("RTLdrELF: %s: Invalid ELF magic (%.*Rhxs)\n", pszLogName, sizeof(pEhdr->e_ident), pEhdr->e_ident)); NOREF(pszLogName);
1474	return VERR_BAD_EXE_FORMAT;
1475	}
1476	if (pEhdr->e_ident[EI_CLASS] != RTLDRELF_SUFF(ELFCLASS))
1477	{
1478	Log(("RTLdrELF: %s: Invalid ELF class (%.*Rhxs)\n", pszLogName, sizeof(pEhdr->e_ident), pEhdr->e_ident));
1479	return VERR_BAD_EXE_FORMAT;
1480	}
1481	if (pEhdr->e_ident[EI_DATA] != ELFDATA2LSB)
1482	{
1483	Log(("RTLdrELF: %s: ELF endian %x is unsupported\n", pszLogName, pEhdr->e_ident[EI_DATA]));
1484	return VERR_LDRELF_ODD_ENDIAN;
1485	}
1486	if (pEhdr->e_version != EV_CURRENT)
1487	{
1488	Log(("RTLdrELF: %s: ELF version %x is unsupported\n", pszLogName, pEhdr->e_version));
1489	return VERR_LDRELF_VERSION;
1490	}
1491
1492	if (sizeof(Elf_Ehdr) != pEhdr->e_ehsize)
1493	{
1494	Log(("RTLdrELF: %s: Elf header e_ehsize is %d expected %d!\n",
1495	pszLogName, pEhdr->e_ehsize, sizeof(Elf_Ehdr)));
1496	return VERR_BAD_EXE_FORMAT;
1497	}
1498	if ( sizeof(Elf_Phdr) != pEhdr->e_phentsize
1499	&& ( pEhdr->e_phnum != 0
1500	\|\| pEhdr->e_type == ET_DYN))
1501	{
1502	Log(("RTLdrELF: %s: Elf header e_phentsize is %d expected %d!\n",
1503	pszLogName, pEhdr->e_phentsize, sizeof(Elf_Phdr)));
1504	return VERR_BAD_EXE_FORMAT;
1505	}
1506	if (sizeof(Elf_Shdr) != pEhdr->e_shentsize)
1507	{
1508	Log(("RTLdrELF: %s: Elf header e_shentsize is %d expected %d!\n",
1509	pszLogName, pEhdr->e_shentsize, sizeof(Elf_Shdr)));
1510	return VERR_BAD_EXE_FORMAT;
1511	}
1512
1513	switch (pEhdr->e_type)
1514	{
1515	case ET_REL:
1516	case ET_EXEC:
1517	case ET_DYN:
1518	break;
1519	default:
1520	Log(("RTLdrELF: %s: image type %#x is not supported!\n", pszLogName, pEhdr->e_type));
1521	return VERR_BAD_EXE_FORMAT;
1522	}
1523
1524	switch (pEhdr->e_machine)
1525	{
1526	#if ELF_MODE == 32
1527	case EM_386:
1528	case EM_486:
1529	*penmArch = RTLDRARCH_X86_32;
1530	break;
1531	#elif ELF_MODE == 64
1532	case EM_X86_64:
1533	*penmArch = RTLDRARCH_AMD64;
1534	break;
1535	#endif
1536	default:
1537	Log(("RTLdrELF: %s: machine type %u is not supported!\n", pszLogName, pEhdr->e_machine));
1538	return VERR_LDRELF_MACHINE;
1539	}
1540
1541	if ( pEhdr->e_phoff < pEhdr->e_ehsize
1542	&& !(pEhdr->e_phoff && pEhdr->e_phnum)
1543	&& pEhdr->e_phnum)
1544	{
1545	Log(("RTLdrELF: %s: The program headers overlap with the ELF header! e_phoff=" FMT_ELF_OFF "\n",
1546	pszLogName, pEhdr->e_phoff));
1547	return VERR_BAD_EXE_FORMAT;
1548	}
1549	if ( pEhdr->e_phoff + pEhdr->e_phnum * pEhdr->e_phentsize > cbRawImage
1550	\|\| pEhdr->e_phoff + pEhdr->e_phnum * pEhdr->e_phentsize < pEhdr->e_phoff)
1551	{
1552	Log(("RTLdrELF: %s: The program headers extends beyond the file! e_phoff=" FMT_ELF_OFF " e_phnum=" FMT_ELF_HALF "\n",
1553	pszLogName, pEhdr->e_phoff, pEhdr->e_phnum));
1554	return VERR_BAD_EXE_FORMAT;
1555	}
1556
1557
1558	if ( pEhdr->e_shoff < pEhdr->e_ehsize
1559	&& !(pEhdr->e_shoff && pEhdr->e_shnum))
1560	{
1561	Log(("RTLdrELF: %s: The section headers overlap with the ELF header! e_shoff=" FMT_ELF_OFF "\n",
1562	pszLogName, pEhdr->e_shoff));
1563	return VERR_BAD_EXE_FORMAT;
1564	}
1565	if ( pEhdr->e_shoff + pEhdr->e_shnum * pEhdr->e_shentsize > cbRawImage
1566	\|\| pEhdr->e_shoff + pEhdr->e_shnum * pEhdr->e_shentsize < pEhdr->e_shoff)
1567	{
1568	Log(("RTLdrELF: %s: The section headers extends beyond the file! e_shoff=" FMT_ELF_OFF " e_shnum=" FMT_ELF_HALF "\n",
1569	pszLogName, pEhdr->e_shoff, pEhdr->e_shnum));
1570	return VERR_BAD_EXE_FORMAT;
1571	}
1572
1573	if (pEhdr->e_shstrndx == 0 \|\| pEhdr->e_shstrndx > pEhdr->e_shnum)
1574	{
1575	Log(("RTLdrELF: %s: The section headers string table is out of bounds! e_shstrndx=" FMT_ELF_HALF " e_shnum=" FMT_ELF_HALF "\n",
1576	pszLogName, pEhdr->e_shstrndx, pEhdr->e_shnum));
1577	return VERR_BAD_EXE_FORMAT;
1578	}
1579
1580	return VINF_SUCCESS;
1581	}
1582
1583	/**
1584	* Gets the section header name.
1585	*
1586	* @returns pszName.
1587	* @param pEhdr The elf header.
1588	* @param offName The offset of the section header name.
1589	* @param pszName Where to store the name.
1590	* @param cbName The size of the buffer pointed to by pszName.
1591	*/
1592	const char RTLDRELF_NAME(GetSHdrName)(PRTLDRMODELF pModElf, Elf_Word offName, char pszName, size_t cbName)
1593	{
1594	RTFOFF off = pModElf->paShdrs[pModElf->Ehdr.e_shstrndx].sh_offset + offName;
1595	int rc = pModElf->Core.pReader->pfnRead(pModElf->Core.pReader, pszName, cbName - 1, off);
1596	if (RT_FAILURE(rc))
1597	{
1598	/* read by for byte. */
1599	for (unsigned i = 0; i < cbName; i++, off++)
1600	{
1601	rc = pModElf->Core.pReader->pfnRead(pModElf->Core.pReader, pszName + i, 1, off);
1602	if (RT_FAILURE(rc))
1603	{
1604	pszName[i] = '\0';
1605	break;
1606	}
1607	}
1608	}
1609
1610	pszName[cbName - 1] = '\0';
1611	return pszName;
1612	}
1613
1614
1615	/**
1616	* Validates a section header.
1617	*
1618	* @returns iprt status code.
1619	* @param pModElf Pointer to the module structure.
1620	* @param iShdr The index of section header which should be validated.
1621	* The section headers are found in the pModElf->paShdrs array.
1622	* @param pszLogName The log name.
1623	* @param cbRawImage The size of the raw image.
1624	*/
1625	static int RTLDRELF_NAME(ValidateSectionHeader)(PRTLDRMODELF pModElf, unsigned iShdr, const char *pszLogName, RTFOFF cbRawImage)
1626	{
1627	const Elf_Shdr *pShdr = &pModElf->paShdrs[iShdr];
1628	char szSectionName[80]; NOREF(szSectionName);
1629	Log3(("RTLdrELF: Section Header #%d:\n"
1630	"RTLdrELF: sh_name: " FMT_ELF_WORD " - %s\n"
1631	"RTLdrELF: sh_type: " FMT_ELF_WORD " (%s)\n"
1632	"RTLdrELF: sh_flags: " FMT_ELF_XWORD "\n"
1633	"RTLdrELF: sh_addr: " FMT_ELF_ADDR "\n"
1634	"RTLdrELF: sh_offset: " FMT_ELF_OFF "\n"
1635	"RTLdrELF: sh_size: " FMT_ELF_XWORD "\n"
1636	"RTLdrELF: sh_link: " FMT_ELF_WORD "\n"
1637	"RTLdrELF: sh_info: " FMT_ELF_WORD "\n"
1638	"RTLdrELF: sh_addralign: " FMT_ELF_XWORD "\n"
1639	"RTLdrELF: sh_entsize: " FMT_ELF_XWORD "\n",
1640	iShdr,
1641	pShdr->sh_name, RTLDRELF_NAME(GetSHdrName)(pModElf, pShdr->sh_name, szSectionName, sizeof(szSectionName)),
1642	pShdr->sh_type, rtldrElfGetShdrType(pShdr->sh_type), pShdr->sh_flags, pShdr->sh_addr,
1643	pShdr->sh_offset, pShdr->sh_size, pShdr->sh_link, pShdr->sh_info, pShdr->sh_addralign,
1644	pShdr->sh_entsize));
1645
1646	if (iShdr == 0)
1647	{
1648	if ( pShdr->sh_name != 0
1649	\|\| pShdr->sh_type != SHT_NULL
1650	\|\| pShdr->sh_flags != 0
1651	\|\| pShdr->sh_addr != 0
1652	\|\| pShdr->sh_size != 0
1653	\|\| pShdr->sh_offset != 0
1654	\|\| pShdr->sh_link != SHN_UNDEF
1655	\|\| pShdr->sh_addralign != 0
1656	\|\| pShdr->sh_entsize != 0 )
1657	{
1658	Log(("RTLdrELF: %s: Bad #0 section: %.Rhxs\n", pszLogName, sizeof(pShdr), pShdr ));
1659	return VERR_BAD_EXE_FORMAT;
1660	}
1661	return VINF_SUCCESS;
1662	}
1663
1664	if (pShdr->sh_name >= pModElf->cbShStr)
1665	{
1666	Log(("RTLdrELF: %s: Shdr #%d: sh_name (%d) is beyond the end of the section header string table (%d)!\n",
1667	pszLogName, iShdr, pShdr->sh_name, pModElf->cbShStr)); NOREF(pszLogName);
1668	return VERR_BAD_EXE_FORMAT;
1669	}
1670
1671	if (pShdr->sh_link >= pModElf->Ehdr.e_shnum)
1672	{
1673	Log(("RTLdrELF: %s: Shdr #%d: sh_link (%d) is beyond the end of the section table (%d)!\n",
1674	pszLogName, iShdr, pShdr->sh_link, pModElf->Ehdr.e_shnum)); NOREF(pszLogName);
1675	return VERR_BAD_EXE_FORMAT;
1676	}
1677
1678	switch (pShdr->sh_type)
1679	{
1680	/** @todo find specs and check up which sh_info fields indicates section table entries */
1681	case 12301230:
1682	if (pShdr->sh_info >= pModElf->Ehdr.e_shnum)
1683	{
1684	Log(("RTLdrELF: %s: Shdr #%d: sh_info (%d) is beyond the end of the section table (%d)!\n",
1685	pszLogName, iShdr, pShdr->sh_link, pModElf->Ehdr.e_shnum));
1686	return VERR_BAD_EXE_FORMAT;
1687	}
1688	break;
1689
1690	case SHT_NULL:
1691	break;
1692	case SHT_PROGBITS:
1693	case SHT_SYMTAB:
1694	case SHT_STRTAB:
1695	case SHT_RELA:
1696	case SHT_HASH:
1697	case SHT_DYNAMIC:
1698	case SHT_NOTE:
1699	case SHT_NOBITS:
1700	case SHT_REL:
1701	case SHT_SHLIB:
1702	case SHT_DYNSYM:
1703	/*
1704	* For these types sh_info doesn't have any special meaning, or anything which
1705	* we need/can validate now.
1706	*/
1707	break;
1708
1709
1710	default:
1711	Log(("RTLdrELF: %s: Warning, unknown type %d!\n", pszLogName, pShdr->sh_type));
1712	break;
1713	}
1714
1715	if ( pShdr->sh_type != SHT_NOBITS
1716	&& pShdr->sh_size)
1717	{
1718	RTFOFF offEnd = pShdr->sh_offset + pShdr->sh_size;
1719	if ( offEnd > cbRawImage
1720	\|\| offEnd < (RTFOFF)pShdr->sh_offset)
1721	{
1722	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",
1723	pszLogName, iShdr, pShdr->sh_offset, pShdr->sh_size, offEnd, cbRawImage));
1724	return VERR_BAD_EXE_FORMAT;
1725	}
1726	if (pShdr->sh_offset < sizeof(Elf_Ehdr))
1727	{
1728	Log(("RTLdrELF: %s: Shdr #%d: sh_offset (" FMT_ELF_OFF ") + sh_size (" FMT_ELF_XWORD ") is starting in the ELF header!\n",
1729	pszLogName, iShdr, pShdr->sh_offset, pShdr->sh_size));
1730	return VERR_BAD_EXE_FORMAT;
1731	}
1732	}
1733
1734	return VINF_SUCCESS;
1735	}
1736
1737
1738
1739	/**
1740	* Opens an ELF image, fixed bitness.
1741	*
1742	* @returns iprt status code.
1743	* @param pReader The loader reader instance which will provide the raw image bits.
1744	* @param fFlags Reserved, MBZ.
1745	* @param enmArch Architecture specifier.
1746	* @param phLdrMod Where to store the handle.
1747	*/
1748	static int RTLDRELF_NAME(Open)(PRTLDRREADER pReader, uint32_t fFlags, RTLDRARCH enmArch, PRTLDRMOD phLdrMod)
1749	{
1750	const char *pszLogName = pReader->pfnLogName(pReader);
1751	RTFOFF cbRawImage = pReader->pfnSize(pReader);
1752	RT_NOREF_PV(fFlags);
1753
1754	/*
1755	* Create the loader module instance.
1756	*/
1757	PRTLDRMODELF pModElf = (PRTLDRMODELF)RTMemAllocZ(sizeof(*pModElf));
1758	if (!pModElf)
1759	return VERR_NO_MEMORY;
1760
1761	pModElf->Core.u32Magic = RTLDRMOD_MAGIC;
1762	pModElf->Core.eState = LDR_STATE_INVALID;
1763	pModElf->Core.pReader = pReader;
1764	pModElf->Core.enmFormat = RTLDRFMT_ELF;
1765	pModElf->Core.enmType = RTLDRTYPE_OBJECT;
1766	pModElf->Core.enmEndian = RTLDRENDIAN_LITTLE;
1767	#if ELF_MODE == 32
1768	pModElf->Core.enmArch = RTLDRARCH_X86_32;
1769	#else
1770	pModElf->Core.enmArch = RTLDRARCH_AMD64;
1771	#endif
1772	//pModElf->pvBits = NULL;
1773	//pModElf->Ehdr = {0};
1774	//pModElf->paShdrs = NULL;
1775	//pModElf->paSyms = NULL;
1776	pModElf->iSymSh = ~0U;
1777	//pModElf->cSyms = 0;
1778	pModElf->iStrSh = ~0U;
1779	//pModElf->cbStr = 0;
1780	//pModElf->cbImage = 0;
1781	//pModElf->LinkAddress = 0;
1782	//pModElf->pStr = NULL;
1783	//pModElf->cbShStr = 0;
1784	//pModElf->pShStr = NULL;
1785
1786	/*
1787	* Read and validate the ELF header and match up the CPU architecture.
1788	*/
1789	int rc = pReader->pfnRead(pReader, &pModElf->Ehdr, sizeof(pModElf->Ehdr), 0);
1790	if (RT_SUCCESS(rc))
1791	{
1792	RTLDRARCH enmArchImage = RTLDRARCH_INVALID; /* shut up gcc */
1793	rc = RTLDRELF_NAME(ValidateElfHeader)(&pModElf->Ehdr, pszLogName, cbRawImage, &enmArchImage);
1794	if (RT_SUCCESS(rc))
1795	{
1796	if ( enmArch != RTLDRARCH_WHATEVER
1797	&& enmArch != enmArchImage)
1798	rc = VERR_LDR_ARCH_MISMATCH;
1799	}
1800	}
1801	if (RT_SUCCESS(rc))
1802	{
1803	/*
1804	* Read the section headers, keeping a prestine copy for the module
1805	* introspection methods.
1806	*/
1807	size_t const cbShdrs = pModElf->Ehdr.e_shnum * sizeof(Elf_Shdr);
1808	Elf_Shdr paShdrs = (Elf_Shdr )RTMemAlloc(cbShdrs * 2);
1809	if (paShdrs)
1810	{
1811	pModElf->paShdrs = paShdrs;
1812	rc = pReader->pfnRead(pReader, paShdrs, cbShdrs, pModElf->Ehdr.e_shoff);
1813	if (RT_SUCCESS(rc))
1814	{
1815	memcpy(&paShdrs[pModElf->Ehdr.e_shnum], paShdrs, cbShdrs);
1816	pModElf->paOrgShdrs = &paShdrs[pModElf->Ehdr.e_shnum];
1817
1818	pModElf->cbShStr = paShdrs[pModElf->Ehdr.e_shstrndx].sh_size;
1819
1820	/*
1821	* Validate the section headers and find relevant sections.
1822	*/
1823	Elf_Addr uNextAddr = 0;
1824	for (unsigned i = 0; i < pModElf->Ehdr.e_shnum; i++)
1825	{
1826	rc = RTLDRELF_NAME(ValidateSectionHeader)(pModElf, i, pszLogName, cbRawImage);
1827	if (RT_FAILURE(rc))
1828	break;
1829
1830	/* We're looking for symbol tables. */
1831	if (paShdrs[i].sh_type == SHT_SYMTAB)
1832	{
1833	if (pModElf->iSymSh != ~0U)
1834	{
1835	Log(("RTLdrElf: %s: Multiple symbol tabs! iSymSh=%d i=%d\n", pszLogName, pModElf->iSymSh, i));
1836	rc = VERR_LDRELF_MULTIPLE_SYMTABS;
1837	break;
1838	}
1839	pModElf->iSymSh = i;
1840	pModElf->cSyms = (unsigned)(paShdrs[i].sh_size / sizeof(Elf_Sym));
1841	AssertReturn(pModElf->cSyms == paShdrs[i].sh_size / sizeof(Elf_Sym), VERR_IMAGE_TOO_BIG);
1842	pModElf->iStrSh = paShdrs[i].sh_link;
1843	pModElf->cbStr = (unsigned)paShdrs[pModElf->iStrSh].sh_size;
1844	AssertReturn(pModElf->cbStr == paShdrs[pModElf->iStrSh].sh_size, VERR_IMAGE_TOO_BIG);
1845	}
1846
1847	/* Special checks for the section string table. */
1848	if (i == pModElf->Ehdr.e_shstrndx)
1849	{
1850	if (paShdrs[i].sh_type != SHT_STRTAB)
1851	{
1852	Log(("RTLdrElf: Section header string table is not a SHT_STRTAB: %#x\n", paShdrs[i].sh_type));
1853	rc = VERR_BAD_EXE_FORMAT;
1854	break;
1855	}
1856	if (paShdrs[i].sh_size == 0)
1857	{
1858	Log(("RTLdrElf: Section header string table is empty\n"));
1859	rc = VERR_BAD_EXE_FORMAT;
1860	break;
1861	}
1862	}
1863
1864	/* Kluge for the .data..percpu segment in 64-bit linux kernels. */
1865	if (paShdrs[i].sh_flags & SHF_ALLOC)
1866	{
1867	if ( paShdrs[i].sh_addr == 0
1868	&& paShdrs[i].sh_addr < uNextAddr)
1869	{
1870	Elf_Addr uAddr = RT_ALIGN_T(uNextAddr, paShdrs[i].sh_addralign, Elf_Addr);
1871	Log(("RTLdrElf: Out of order section #%d; adjusting sh_addr from " FMT_ELF_ADDR " to " FMT_ELF_ADDR "\n",
1872	i, paShdrs[i].sh_addr, uAddr));
1873	paShdrs[i].sh_addr = uAddr;
1874	}
1875	uNextAddr = paShdrs[i].sh_addr + paShdrs[i].sh_size;
1876	}
1877	} /* for each section header */
1878
1879	/*
1880	* Calculate the image base address if the image isn't relocatable.
1881	*/
1882	if (RT_SUCCESS(rc) && pModElf->Ehdr.e_type != ET_REL)
1883	{
1884	pModElf->LinkAddress = ~(Elf_Addr)0;
1885	for (unsigned i = 0; i < pModElf->Ehdr.e_shnum; i++)
1886	if ( (paShdrs[i].sh_flags & SHF_ALLOC)
1887	&& paShdrs[i].sh_addr < pModElf->LinkAddress)
1888	pModElf->LinkAddress = paShdrs[i].sh_addr;
1889	if (pModElf->LinkAddress == ~(Elf_Addr)0)
1890	{
1891	AssertFailed();
1892	rc = VERR_LDR_GENERAL_FAILURE;
1893	}
1894	}
1895
1896	/*
1897	* Perform allocations / RVA calculations, determine the image size.
1898	*/
1899	if (RT_SUCCESS(rc))
1900	for (unsigned i = 0; i < pModElf->Ehdr.e_shnum; i++)
1901	if (paShdrs[i].sh_flags & SHF_ALLOC)
1902	{
1903	if (pModElf->Ehdr.e_type == ET_REL)
1904	paShdrs[i].sh_addr = paShdrs[i].sh_addralign
1905	? RT_ALIGN_T(pModElf->cbImage, paShdrs[i].sh_addralign, Elf_Addr)
1906	: (Elf_Addr)pModElf->cbImage;
1907	else
1908	paShdrs[i].sh_addr -= pModElf->LinkAddress;
1909	Elf_Addr EndAddr = paShdrs[i].sh_addr + paShdrs[i].sh_size;
1910	if (pModElf->cbImage < EndAddr)
1911	{
1912	pModElf->cbImage = (size_t)EndAddr;
1913	AssertMsgReturn(pModElf->cbImage == EndAddr, (FMT_ELF_ADDR "\n", EndAddr), VERR_IMAGE_TOO_BIG);
1914	}
1915	Log2(("RTLdrElf: %s: Assigned " FMT_ELF_ADDR " to section #%d\n", pszLogName, paShdrs[i].sh_addr, i));
1916	}
1917
1918	Log2(("RTLdrElf: iSymSh=%u cSyms=%u iStrSh=%u cbStr=%u rc=%Rrc cbImage=%#zx LinkAddress=" FMT_ELF_ADDR "\n",
1919	pModElf->iSymSh, pModElf->cSyms, pModElf->iStrSh, pModElf->cbStr, rc,
1920	pModElf->cbImage, pModElf->LinkAddress));
1921	if (RT_SUCCESS(rc))
1922	{
1923	pModElf->Core.pOps = &RTLDRELF_MID(s_rtldrElf,Ops);
1924	pModElf->Core.eState = LDR_STATE_OPENED;
1925	*phLdrMod = &pModElf->Core;
1926
1927	LogFlow(("%s: %s: returns VINF_SUCCESS phLdrMod=%p\n", __FUNCTION__, pszLogName, phLdrMod));
1928	return VINF_SUCCESS;
1929	}
1930	}
1931
1932	RTMemFree(paShdrs);
1933	}
1934	else
1935	rc = VERR_NO_MEMORY;
1936	}
1937
1938	RTMemFree(pModElf);
1939	LogFlow(("%s: returns %Rrc\n", __FUNCTION__, rc));
1940	return rc;
1941	}
1942
1943
1944
1945
1946	/*******************************************************************************
1947	* Cleanup Constants And Macros *
1948	*******************************************************************************/
1949	#undef RTLDRELF_NAME
1950	#undef RTLDRELF_SUFF
1951	#undef RTLDRELF_MID
1952
1953	#undef FMT_ELF_ADDR
1954	#undef FMT_ELF_HALF
1955	#undef FMT_ELF_SHALF
1956	#undef FMT_ELF_OFF
1957	#undef FMT_ELF_SIZE
1958	#undef FMT_ELF_SWORD
1959	#undef FMT_ELF_WORD
1960	#undef FMT_ELF_XWORD
1961	#undef FMT_ELF_SXWORD
1962
1963	#undef Elf_Ehdr
1964	#undef Elf_Phdr
1965	#undef Elf_Shdr
1966	#undef Elf_Sym
1967	#undef Elf_Rel
1968	#undef Elf_Rela
1969	#undef Elf_Reloc
1970	#undef Elf_Nhdr
1971	#undef Elf_Dyn
1972
1973	#undef Elf_Addr
1974	#undef Elf_Half
1975	#undef Elf_Off
1976	#undef Elf_Size
1977	#undef Elf_Sword
1978	#undef Elf_Word
1979
1980	#undef RTLDRMODELF
1981	#undef PRTLDRMODELF
1982
1983	#undef ELF_R_SYM
1984	#undef ELF_R_TYPE
1985	#undef ELF_R_INFO
1986
1987	#undef ELF_ST_BIND
1988

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source: vbox/trunk/src/VBox/Runtime/common/ldr/ldrELFRelocatable.cpp.h@ 73494

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