/* * CDDL HEADER START * * The contents of this file are subject to the terms of the * Common Development and Distribution License (the "License"). * You may not use this file except in compliance with the License. * * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE * or http://www.opensolaris.org/os/licensing. * See the License for the specific language governing permissions * and limitations under the License. * * When distributing Covered Code, include this CDDL HEADER in each * file and include the License file at usr/src/OPENSOLARIS.LICENSE. * If applicable, add the following below this CDDL HEADER, with the * fields enclosed by brackets "[]" replaced with your own identifying * information: Portions Copyright [yyyy] [name of copyright owner] * * CDDL HEADER END */ /* * Copyright 2009 Sun Microsystems, Inc. All rights reserved. * Use is subject to license terms. */ /* * Dump an elf file. */ #include #include #include #include <_libelf.h> #include #include #include #include #include #include #include #include #include <_elfdump.h> /* * VERSYM_STATE is used to maintain information about the VERSYM section * in the object being analyzed. It is filled in by versions(), and used * by init_symtbl_state() when displaying symbol information. * * There are three forms of symbol versioning known to us: * * 1) The original form, introduced with Solaris 2.5, in which * the Versym contains indexes to Verdef records, and the * Versym values for UNDEF symbols resolved by other objects * are all set to 0. * 2) The GNU form, which is backward compatible with the original * Solaris form, but which adds several extensions: * - The Versym also contains indexes to Verneed records, recording * which object/version contributed the external symbol at * link time. These indexes start with the next value following * the final Verdef index. The index is written to the previously * reserved vna_other field of the ELF Vernaux structure. * - The top bit of the Versym value is no longer part of the index, * but is used as a "hidden bit" to prevent binding to the symbol. * - Multiple implementations of a given symbol, contained in varying * versions are allowed, using special assembler pseudo ops, * and encoded in the symbol name using '@' characters. * 3) Modified Solaris form, in which we adopt the first GNU extension * (Versym indexes to Verneed records), but not the others. * * elfdump can handle any of these cases. The presence of a DT_VERSYM * dynamic element indicates a full GNU object. An object that lacks * a DT_VERSYM entry, but which has non-zero vna_other fields in the Vernaux * structures is a modified Solaris object. An object that has neither of * these uses the original form. * * max_verndx contains the largest version index that can appear * in a Versym entry. This can never be less than 1: In the case where * there is no verdef/verneed sections, the [0] index is reserved * for local symbols, and the [1] index for globals. If the original * Solaris versioning rules are in effect and there is a verdef section, * then max_verndex is the number of defined versions. If one of the * other versioning forms is in effect, then: * 1) If there is no verneed section, it is the same as for * original Solaris versioning. * 2) If there is a verneed section, the vna_other field of the * Vernaux structs contain versions, and max_verndx is the * largest such index. * * If gnu_full is True, the object uses the full GNU form of versioning. * The value of the gnu_full field is based on the presence of * a DT_VERSYM entry in the dynamic section: GNU ld produces these, and * Solaris ld does not. * * The gnu_needed field is True if the Versym contains indexes to * Verneed records, as indicated by non-zero vna_other fields in the Verneed * section. If gnu_full is True, then gnu_needed will always be true. * However, gnu_needed can be true without gnu_full. This is the modified * Solaris form. */ typedef struct { Cache *cache; /* Pointer to cache entry for VERSYM */ Versym *data; /* Pointer to versym array */ int gnu_full; /* True if object uses GNU versioning rules */ int gnu_needed; /* True if object uses VERSYM indexes for */ /* VERNEED (subset of gnu_full) */ int max_verndx; /* largest versym index value */ } VERSYM_STATE; /* * SYMTBL_STATE is used to maintain information about a single symbol * table section, for use by the routines that display symbol information. */ typedef struct { const char *file; /* Name of file */ Ehdr *ehdr; /* ELF header for file */ Cache *cache; /* Cache of all section headers */ Word shnum; /* # of sections in cache */ Cache *seccache; /* Cache of symbol table section hdr */ Word secndx; /* Index of symbol table section hdr */ const char *secname; /* Name of section */ uint_t flags; /* Command line option flags */ struct { /* Extended section index data */ int checked; /* TRUE if already checked for shxndx */ Word *data; /* NULL, or extended section index */ /* used for symbol table entries */ uint_t n; /* # items in shxndx.data */ } shxndx; VERSYM_STATE *versym; /* NULL, or associated VERSYM section */ Sym *sym; /* Array of symbols */ Word symn; /* # of symbols */ } SYMTBL_STATE; /* * Focal point for verifying symbol names. */ static const char * string(Cache *refsec, Word ndx, Cache *strsec, const char *file, Word name) { /* * If an error in this routine is due to a property of the string * section, as opposed to a bad offset into the section (a property of * the referencing section), then we will detect the same error on * every call involving those sections. We use these static variables * to retain the information needed to only issue each such error once. */ static Cache *last_refsec; /* Last referencing section seen */ static int strsec_err; /* True if error issued */ const char *strs; Word strn; if (strsec->c_data == NULL) return (NULL); strs = (char *)strsec->c_data->d_buf; strn = strsec->c_data->d_size; /* * We only print a diagnostic regarding a bad string table once per * input section being processed. If the refsec has changed, reset * our retained error state. */ if (last_refsec != refsec) { last_refsec = refsec; strsec_err = 0; } /* Verify that strsec really is a string table */ if (strsec->c_shdr->sh_type != SHT_STRTAB) { if (!strsec_err) { (void) fprintf(stderr, MSG_INTL(MSG_ERR_NOTSTRTAB), file, strsec->c_ndx, refsec->c_ndx); strsec_err = 1; } return (MSG_INTL(MSG_STR_UNKNOWN)); } /* * Is the string table offset within range of the available strings? */ if (name >= strn) { /* * Do we have a empty string table? */ if (strs == NULL) { if (!strsec_err) { (void) fprintf(stderr, MSG_INTL(MSG_ERR_BADSZ), file, strsec->c_name); strsec_err = 1; } } else { (void) fprintf(stderr, MSG_INTL(MSG_ERR_BADSTOFF), file, refsec->c_name, EC_WORD(ndx), strsec->c_name, EC_WORD(name), EC_WORD(strn - 1)); } /* * Return the empty string so that the calling function can * continue it's output diagnostics. */ return (MSG_INTL(MSG_STR_UNKNOWN)); } return (strs + name); } /* * Relocations can reference section symbols and standard symbols. If the * former, establish the section name. */ static const char * relsymname(Cache *cache, Cache *csec, Cache *strsec, Word symndx, Word symnum, Word relndx, Sym *syms, char *secstr, size_t secsz, const char *file) { Sym *sym; const char *name; if (symndx >= symnum) { (void) fprintf(stderr, MSG_INTL(MSG_ERR_RELBADSYMNDX), file, EC_WORD(symndx), EC_WORD(relndx)); return (MSG_INTL(MSG_STR_UNKNOWN)); } sym = (Sym *)(syms + symndx); name = string(csec, symndx, strsec, file, sym->st_name); /* * If the symbol represents a section offset construct an appropriate * string. Note, although section symbol table entries typically have * a NULL name pointer, entries do exist that point into the string * table to their own NULL strings. */ if ((ELF_ST_TYPE(sym->st_info) == STT_SECTION) && ((sym->st_name == 0) || (*name == '\0'))) { (void) snprintf(secstr, secsz, MSG_INTL(MSG_STR_SECTION), cache[sym->st_shndx].c_name); return ((const char *)secstr); } return (name); } /* * Focal point for establishing a string table section. Data such as the * dynamic information simply points to a string table. Data such as * relocations, reference a symbol table, which in turn is associated with a * string table. */ static int stringtbl(Cache *cache, int symtab, Word ndx, Word shnum, const char *file, Word *symnum, Cache **symsec, Cache **strsec) { Shdr *shdr = cache[ndx].c_shdr; if (symtab) { /* * Validate the symbol table section. */ if ((shdr->sh_link == 0) || (shdr->sh_link >= shnum)) { (void) fprintf(stderr, MSG_INTL(MSG_ERR_BADSHLINK), file, cache[ndx].c_name, EC_WORD(shdr->sh_link)); return (0); } if ((shdr->sh_entsize == 0) || (shdr->sh_size == 0)) { (void) fprintf(stderr, MSG_INTL(MSG_ERR_BADSZ), file, cache[ndx].c_name); return (0); } /* * Obtain, and verify the symbol table data. */ if ((cache[ndx].c_data == NULL) || (cache[ndx].c_data->d_buf == NULL)) { (void) fprintf(stderr, MSG_INTL(MSG_ERR_BADSZ), file, cache[ndx].c_name); return (0); } /* * Establish the string table index. */ ndx = shdr->sh_link; shdr = cache[ndx].c_shdr; /* * Return symbol table information. */ if (symnum) *symnum = (shdr->sh_size / shdr->sh_entsize); if (symsec) *symsec = &cache[ndx]; } /* * Validate the associated string table section. */ if ((shdr->sh_link == 0) || (shdr->sh_link >= shnum)) { (void) fprintf(stderr, MSG_INTL(MSG_ERR_BADSHLINK), file, cache[ndx].c_name, EC_WORD(shdr->sh_link)); return (0); } if (strsec) *strsec = &cache[shdr->sh_link]; return (1); } /* * Lookup a symbol and set Sym accordingly. */ static int symlookup(const char *name, Cache *cache, Word shnum, Sym **sym, Cache *symtab, const char *file) { Shdr *shdr; Word symn, cnt; Sym *syms; if (symtab == 0) return (0); shdr = symtab->c_shdr; /* * Determine the symbol data and number. */ if ((shdr->sh_entsize == 0) || (shdr->sh_size == 0)) { (void) fprintf(stderr, MSG_INTL(MSG_ERR_BADSZ), file, symtab->c_name); return (0); } if (symtab->c_data == NULL) return (0); /* LINTED */ symn = (Word)(shdr->sh_size / shdr->sh_entsize); syms = (Sym *)symtab->c_data->d_buf; /* * Get the associated string table section. */ if ((shdr->sh_link == 0) || (shdr->sh_link >= shnum)) { (void) fprintf(stderr, MSG_INTL(MSG_ERR_BADSHLINK), file, symtab->c_name, EC_WORD(shdr->sh_link)); return (0); } /* * Loop through the symbol table to find a match. */ for (cnt = 0; cnt < symn; syms++, cnt++) { const char *symname; symname = string(symtab, cnt, &cache[shdr->sh_link], file, syms->st_name); if (symname && (strcmp(name, symname) == 0)) { *sym = syms; return (1); } } return (0); } /* * Print section headers. */ static void sections(const char *file, Cache *cache, Word shnum, Ehdr *ehdr) { size_t seccnt; for (seccnt = 1; seccnt < shnum; seccnt++) { Cache *_cache = &cache[seccnt]; Shdr *shdr = _cache->c_shdr; const char *secname = _cache->c_name; /* * Although numerous section header entries can be zero, it's * usually a sign of trouble if the type is zero. */ if (shdr->sh_type == 0) { (void) fprintf(stderr, MSG_INTL(MSG_ERR_BADSHTYPE), file, secname, EC_WORD(shdr->sh_type)); } if (!match(MATCH_F_ALL, secname, seccnt, shdr->sh_type)) continue; /* * Identify any sections that are suspicious. A .got section * shouldn't exist in a relocatable object. */ if (ehdr->e_type == ET_REL) { if (strncmp(secname, MSG_ORIG(MSG_ELF_GOT), MSG_ELF_GOT_SIZE) == 0) { (void) fprintf(stderr, MSG_INTL(MSG_GOT_UNEXPECTED), file, secname); } } dbg_print(0, MSG_ORIG(MSG_STR_EMPTY)); dbg_print(0, MSG_INTL(MSG_ELF_SHDR), EC_WORD(seccnt), secname); Elf_shdr(0, ehdr->e_machine, shdr); } } /* * Obtain a specified Phdr entry. */ static Phdr * getphdr(Word phnum, Word *type_arr, Word type_cnt, const char *file, Elf *elf) { Word cnt, tcnt; Phdr *phdr; if ((phdr = elf_getphdr(elf)) == NULL) { failure(file, MSG_ORIG(MSG_ELF_GETPHDR)); return (NULL); } for (cnt = 0; cnt < phnum; phdr++, cnt++) { for (tcnt = 0; tcnt < type_cnt; tcnt++) { if (phdr->p_type == type_arr[tcnt]) return (phdr); } } return (NULL); } static void unwind(Cache *cache, Word shnum, Word phnum, Ehdr *ehdr, const char *file, Elf *elf) { #if defined(_ELF64) #define MSG_UNW_BINSRTAB2 MSG_UNW_BINSRTAB2_64 #define MSG_UNW_BINSRTABENT MSG_UNW_BINSRTABENT_64 #else #define MSG_UNW_BINSRTAB2 MSG_UNW_BINSRTAB2_32 #define MSG_UNW_BINSRTABENT MSG_UNW_BINSRTABENT_32 #endif static Word phdr_types[] = { PT_SUNW_UNWIND, PT_SUNW_EH_FRAME }; int frame_cnt = 0, hdr_cnt = 0, frame_ndx, hdr_ndx; uint64_t save_frame_ptr, save_frame_base; Conv_dwarf_ehe_buf_t dwarf_ehe_buf; Word cnt; Phdr *uphdr = NULL; /* * Historical background: .eh_frame and .eh_frame_hdr sections * come from the GNU compilers (particularly C++), and are used * under all architectures. Their format is based on DWARF. When * the amd64 ABI was defined, these sections were adopted wholesale * from the existing practice. * * When amd64 support was added to Solaris, support for these * sections was added, using the SHT_AMD64_UNWIND section type * to identify them. At first, we ignored them in objects for * non-amd64 targets, but later broadened our support to include * other architectures in order to better support gcc-generated * objects. * * We match these sections by name, rather than section type, * because they can come in as either SHT_AMD64_UNWIND, or as * SHT_PROGBITS, and because we need to distinquish between * the two types (.eh_frame and .eh_frame_hdr). */ if (phnum) uphdr = getphdr(phnum, phdr_types, sizeof (phdr_types) / sizeof (*phdr_types), file, elf); for (cnt = 1; cnt < shnum; cnt++) { Cache *_cache = &cache[cnt]; Shdr *shdr = _cache->c_shdr; uchar_t *data; size_t datasize; uint64_t ndx, frame_ptr, fde_cnt, tabndx; uint_t vers, frame_ptr_enc, fde_cnt_enc, table_enc; /* * Skip sections of the wrong type. On amd64, Solaris tags * these as SHT_AMD64_UNWIND, while gcc started out issuing * them as SHT_PROGBITS and switched over when the amd64 ABI * was finalized. On non-amd64, they're all SHT_PROGBITS. */ switch (shdr->sh_type) { case SHT_PROGBITS: if (ehdr->e_machine == EM_AMD64) continue; break; case SHT_AMD64_UNWIND: if (ehdr->e_machine != EM_AMD64) continue; break; default: continue; } /* * Only sections with names starting with .eh_frame or * .eh_frame_hdr are of interest. We do a prefix comparison, * allowing for naming conventions like .eh_frame.foo, hence * the use of strncmp() rather than strcmp(). This means that * we only really need to test for .eh_frame, as it's a * prefix of .eh_frame_hdr. */ if (strncmp(_cache->c_name, MSG_ORIG(MSG_SCN_FRM), MSG_SCN_FRM_SIZE) != 0) continue; if (!match(MATCH_F_ALL, _cache->c_name, cnt, shdr->sh_type)) continue; if (_cache->c_data == NULL) continue; dbg_print(0, MSG_ORIG(MSG_STR_EMPTY)); dbg_print(0, MSG_INTL(MSG_ELF_SCN_UNWIND), _cache->c_name); data = (uchar_t *)(_cache->c_data->d_buf); datasize = _cache->c_data->d_size; /* * Is this a .eh_frame_hdr */ if ((uphdr && (shdr->sh_addr == uphdr->p_vaddr)) || (strncmp(_cache->c_name, MSG_ORIG(MSG_SCN_FRMHDR), MSG_SCN_FRMHDR_SIZE) == 0)) { /* * There can only be a single .eh_frame_hdr. * Flag duplicates. */ if (++hdr_cnt > 1) (void) fprintf(stderr, MSG_INTL(MSG_ERR_MULTEHFRMHDR), file, EC_WORD(cnt), _cache->c_name); dbg_print(0, MSG_ORIG(MSG_UNW_FRMHDR)); ndx = 0; vers = data[ndx++]; frame_ptr_enc = data[ndx++]; fde_cnt_enc = data[ndx++]; table_enc = data[ndx++]; dbg_print(0, MSG_ORIG(MSG_UNW_FRMVERS), vers); frame_ptr = dwarf_ehe_extract(data, &ndx, frame_ptr_enc, ehdr->e_ident, shdr->sh_addr, ndx); if (hdr_cnt == 1) { hdr_ndx = cnt; save_frame_ptr = frame_ptr; } dbg_print(0, MSG_ORIG(MSG_UNW_FRPTRENC), conv_dwarf_ehe(frame_ptr_enc, &dwarf_ehe_buf), EC_XWORD(frame_ptr)); fde_cnt = dwarf_ehe_extract(data, &ndx, fde_cnt_enc, ehdr->e_ident, shdr->sh_addr, ndx); dbg_print(0, MSG_ORIG(MSG_UNW_FDCNENC), conv_dwarf_ehe(fde_cnt_enc, &dwarf_ehe_buf), EC_XWORD(fde_cnt)); dbg_print(0, MSG_ORIG(MSG_UNW_TABENC), conv_dwarf_ehe(table_enc, &dwarf_ehe_buf)); dbg_print(0, MSG_ORIG(MSG_UNW_BINSRTAB1)); dbg_print(0, MSG_ORIG(MSG_UNW_BINSRTAB2)); for (tabndx = 0; tabndx < fde_cnt; tabndx++) { dbg_print(0, MSG_ORIG(MSG_UNW_BINSRTABENT), EC_XWORD(dwarf_ehe_extract(data, &ndx, table_enc, ehdr->e_ident, shdr->sh_addr, ndx)), EC_XWORD(dwarf_ehe_extract(data, &ndx, table_enc, ehdr->e_ident, shdr->sh_addr, ndx))); } } else { /* Display the .eh_frame section */ frame_cnt++; if (frame_cnt == 1) { frame_ndx = cnt; save_frame_base = shdr->sh_addr; } else if ((frame_cnt > 1) && (ehdr->e_type != ET_REL)) { Conv_inv_buf_t inv_buf; (void) fprintf(stderr, MSG_INTL(MSG_WARN_MULTEHFRM), file, EC_WORD(cnt), _cache->c_name, conv_ehdr_type(ehdr->e_type, 0, &inv_buf)); } dump_eh_frame(data, datasize, shdr->sh_addr, ehdr->e_machine, ehdr->e_ident); } /* * If we've seen the .eh_frame_hdr and the first * .eh_frame section, compare the header frame_ptr * to the address of the actual frame section to ensure * the link-editor got this right. */ if ((hdr_cnt > 0) && (frame_cnt > 0) && (save_frame_ptr != save_frame_base)) (void) fprintf(stderr, MSG_INTL(MSG_ERR_BADEHFRMPTR), file, EC_WORD(hdr_ndx), cache[hdr_ndx].c_name, EC_XWORD(save_frame_ptr), EC_WORD(frame_ndx), cache[frame_ndx].c_name, EC_XWORD(save_frame_base)); } #undef MSG_UNW_BINSRTAB2 #undef MSG_UNW_BINSRTABENT } /* * Print the hardware/software capabilities. For executables and shared objects * this should be accompanied with a program header. */ static void cap(const char *file, Cache *cache, Word shnum, Word phnum, Ehdr *ehdr, Elf *elf) { Word cnt; Shdr *cshdr = NULL; Cache *ccache; Off cphdr_off = 0; Xword cphdr_sz; /* * Determine if a hardware/software capabilities header exists. */ if (phnum) { Phdr *phdr; if ((phdr = elf_getphdr(elf)) == NULL) { failure(file, MSG_ORIG(MSG_ELF_GETPHDR)); return; } for (cnt = 0; cnt < phnum; phdr++, cnt++) { if (phdr->p_type == PT_SUNWCAP) { cphdr_off = phdr->p_offset; cphdr_sz = phdr->p_filesz; break; } } } /* * Determine if a hardware/software capabilities section exists. */ for (cnt = 1; cnt < shnum; cnt++) { Cache *_cache = &cache[cnt]; Shdr *shdr = _cache->c_shdr; if (shdr->sh_type != SHT_SUNW_cap) continue; if (cphdr_off && ((cphdr_off < shdr->sh_offset) || (cphdr_off + cphdr_sz) > (shdr->sh_offset + shdr->sh_size))) continue; if (_cache->c_data == NULL) continue; ccache = _cache; cshdr = shdr; break; } if ((cshdr == NULL) && (cphdr_off == 0)) return; /* * Print the hardware/software capabilities section. */ if (cshdr) { Word ndx, capn; Cap *cap = (Cap *)ccache->c_data->d_buf; if ((cshdr->sh_entsize == 0) || (cshdr->sh_size == 0)) { (void) fprintf(stderr, MSG_INTL(MSG_ERR_BADSZ), file, ccache->c_name); return; } dbg_print(0, MSG_ORIG(MSG_STR_EMPTY)); dbg_print(0, MSG_INTL(MSG_ELF_SCN_CAP), ccache->c_name); Elf_cap_title(0); capn = (Word)(cshdr->sh_size / cshdr->sh_entsize); for (ndx = 0; ndx < capn; cap++, ndx++) { if (cap->c_tag == CA_SUNW_NULL) continue; Elf_cap_entry(0, cap, ndx, ehdr->e_machine); /* * An SF1_SUNW_ADDR32 software capability in a 32-bit * object is suspicious as it has no effect. */ if ((cap->c_tag == CA_SUNW_SF_1) && (ehdr->e_ident[EI_CLASS] == ELFCLASS32) && (cap->c_un.c_val & SF1_SUNW_ADDR32)) { (void) fprintf(stderr, MSG_INTL(MSG_WARN_INADDR32SF1), file, ccache->c_name); } } } else (void) fprintf(stderr, MSG_INTL(MSG_WARN_INVCAP1), file); /* * If this object is an executable or shared object, then the * hardware/software capabilities section should have an accompanying * program header. */ if (cshdr && ((ehdr->e_type == ET_EXEC) || (ehdr->e_type == ET_DYN))) { if (cphdr_off == 0) (void) fprintf(stderr, MSG_INTL(MSG_WARN_INVCAP2), file, ccache->c_name); else if ((cphdr_off != cshdr->sh_offset) || (cphdr_sz != cshdr->sh_size)) (void) fprintf(stderr, MSG_INTL(MSG_WARN_INVCAP3), file, ccache->c_name); } } /* * Print the interpretor. */ static void interp(const char *file, Cache *cache, Word shnum, Word phnum, Elf *elf) { static Word phdr_types[] = { PT_INTERP }; Word cnt; Shdr *ishdr = NULL; Cache *icache; Off iphdr_off = 0; Xword iphdr_fsz; /* * Determine if an interp header exists. */ if (phnum) { Phdr *phdr; phdr = getphdr(phnum, phdr_types, sizeof (phdr_types) / sizeof (*phdr_types), file, elf); if (phdr != NULL) { iphdr_off = phdr->p_offset; iphdr_fsz = phdr->p_filesz; } } if (iphdr_off == 0) return; /* * Determine if an interp section exists. */ for (cnt = 1; cnt < shnum; cnt++) { Cache *_cache = &cache[cnt]; Shdr *shdr = _cache->c_shdr; /* * Scan sections to find a section which contains the PT_INTERP * string. The target section can't be in a NOBITS section. */ if ((shdr->sh_type == SHT_NOBITS) || (iphdr_off < shdr->sh_offset) || (iphdr_off + iphdr_fsz) > (shdr->sh_offset + shdr->sh_size)) continue; icache = _cache; ishdr = shdr; break; } /* * Print the interpreter string based on the offset defined in the * program header, as this is the offset used by the kernel. */ if (ishdr && icache->c_data) { dbg_print(0, MSG_ORIG(MSG_STR_EMPTY)); dbg_print(0, MSG_INTL(MSG_ELF_SCN_INTERP), icache->c_name); dbg_print(0, MSG_ORIG(MSG_FMT_INDENT), (char *)icache->c_data->d_buf + (iphdr_off - ishdr->sh_offset)); } else (void) fprintf(stderr, MSG_INTL(MSG_WARN_INVINTERP1), file); /* * If there are any inconsistences between the program header and * section information, flag them. */ if (ishdr && ((iphdr_off != ishdr->sh_offset) || (iphdr_fsz != ishdr->sh_size))) { (void) fprintf(stderr, MSG_INTL(MSG_WARN_INVINTERP2), file, icache->c_name); } } /* * Print the syminfo section. */ static void syminfo(Cache *cache, Word shnum, const char *file) { Shdr *infoshdr; Syminfo *info; Sym *syms; Dyn *dyns; Word infonum, cnt, ndx, symnum; Cache *infocache = NULL, *symsec, *strsec; for (cnt = 1; cnt < shnum; cnt++) { if (cache[cnt].c_shdr->sh_type == SHT_SUNW_syminfo) { infocache = &cache[cnt]; break; } } if (infocache == NULL) return; infoshdr = infocache->c_shdr; if ((infoshdr->sh_entsize == 0) || (infoshdr->sh_size == 0)) { (void) fprintf(stderr, MSG_INTL(MSG_ERR_BADSZ), file, infocache->c_name); return; } if (infocache->c_data == NULL) return; infonum = (Word)(infoshdr->sh_size / infoshdr->sh_entsize); info = (Syminfo *)infocache->c_data->d_buf; /* * Get the data buffer of the associated dynamic section. */ if ((infoshdr->sh_info == 0) || (infoshdr->sh_info >= shnum)) { (void) fprintf(stderr, MSG_INTL(MSG_ERR_BADSHINFO), file, infocache->c_name, EC_WORD(infoshdr->sh_info)); return; } if (cache[infoshdr->sh_info].c_data == NULL) return; dyns = cache[infoshdr->sh_info].c_data->d_buf; if (dyns == NULL) { (void) fprintf(stderr, MSG_INTL(MSG_ERR_BADSZ), file, cache[infoshdr->sh_info].c_name); return; } /* * Get the data buffer for the associated symbol table and string table. */ if (stringtbl(cache, 1, cnt, shnum, file, &symnum, &symsec, &strsec) == 0) return; syms = symsec->c_data->d_buf; /* * Loop through the syminfo entries. */ dbg_print(0, MSG_ORIG(MSG_STR_EMPTY)); dbg_print(0, MSG_INTL(MSG_ELF_SCN_SYMINFO), infocache->c_name); Elf_syminfo_title(0); for (ndx = 1, info++; ndx < infonum; ndx++, info++) { Sym *sym; const char *needed = NULL, *name; if ((info->si_flags == 0) && (info->si_boundto == 0)) continue; sym = &syms[ndx]; name = string(infocache, ndx, strsec, file, sym->st_name); if (info->si_boundto < SYMINFO_BT_LOWRESERVE) { Dyn *dyn = &dyns[info->si_boundto]; needed = string(infocache, info->si_boundto, strsec, file, dyn->d_un.d_val); } Elf_syminfo_entry(0, ndx, info, name, needed); } } /* * Print version definition section entries. */ static void version_def(Verdef *vdf, Word vdf_num, Cache *vcache, Cache *scache, const char *file) { Word cnt; char index[MAXNDXSIZE]; Elf_ver_def_title(0); for (cnt = 1; cnt <= vdf_num; cnt++, vdf = (Verdef *)((uintptr_t)vdf + vdf->vd_next)) { Conv_ver_flags_buf_t ver_flags_buf; const char *name, *dep; Half vcnt = vdf->vd_cnt - 1; Half ndx = vdf->vd_ndx; Verdaux *vdap = (Verdaux *)((uintptr_t)vdf + vdf->vd_aux); /* * Obtain the name and first dependency (if any). */ name = string(vcache, cnt, scache, file, vdap->vda_name); vdap = (Verdaux *)((uintptr_t)vdap + vdap->vda_next); if (vcnt) dep = string(vcache, cnt, scache, file, vdap->vda_name); else dep = MSG_ORIG(MSG_STR_EMPTY); (void) snprintf(index, MAXNDXSIZE, MSG_ORIG(MSG_FMT_INDEX), EC_XWORD(ndx)); Elf_ver_line_1(0, index, name, dep, conv_ver_flags(vdf->vd_flags, 0, &ver_flags_buf)); /* * Print any additional dependencies. */ if (vcnt) { vdap = (Verdaux *)((uintptr_t)vdap + vdap->vda_next); for (vcnt--; vcnt; vcnt--, vdap = (Verdaux *)((uintptr_t)vdap + vdap->vda_next)) { dep = string(vcache, cnt, scache, file, vdap->vda_name); Elf_ver_line_2(0, MSG_ORIG(MSG_STR_EMPTY), dep); } } } } /* * Print version needed section entries. * * entry: * vnd - Address of verneed data * vnd_num - # of Verneed entries * vcache - Cache of verneed section being processed * scache - Cache of associated string table section * file - Name of object being processed. * versym - Information about versym section * * exit: * The versions have been printed. If GNU style versioning * is in effect, versym->max_verndx has been updated to * contain the largest version index seen. * * note: * The versym section of an object that follows the original * Solaris versioning rules only contains indexes into the verdef * section. Symbols defined in other objects (UNDEF) are given * a version of 0, indicating that they are not defined by * this file, and the Verneed entries do not have associated version * indexes. For these reasons, we do not display a version index * for original-style Verneed sections. * * The GNU versioning extensions alter this: Symbols defined in other * objects receive a version index in the range above those defined * by the Verdef section, and the vna_other field of the Vernaux * structs inside the Verneed section contain the version index for * that item. We therefore display the index when showing the * contents of a GNU style Verneed section. You should not * necessarily expect these indexes to appear in sorted * order --- it seems that the GNU ld assigns the versions as * symbols are encountered during linking, and then the results * are assembled into the Verneed section afterwards. */ static void version_need(Verneed *vnd, Word vnd_num, Cache *vcache, Cache *scache, const char *file, VERSYM_STATE *versym) { Word cnt; char index[MAXNDXSIZE]; const char *index_str; Elf_ver_need_title(0, versym->gnu_needed); for (cnt = 1; cnt <= vnd_num; cnt++, vnd = (Verneed *)((uintptr_t)vnd + vnd->vn_next)) { Conv_ver_flags_buf_t ver_flags_buf; const char *name, *dep; Half vcnt = vnd->vn_cnt; Vernaux *vnap = (Vernaux *)((uintptr_t)vnd + vnd->vn_aux); /* * Obtain the name of the needed file and the version name * within it that we're dependent on. Note that the count * should be at least one, otherwise this is a pretty bogus * entry. */ name = string(vcache, cnt, scache, file, vnd->vn_file); if (vcnt) dep = string(vcache, cnt, scache, file, vnap->vna_name); else dep = MSG_INTL(MSG_STR_NULL); if (vnap->vna_other == 0) { /* Traditional form */ index_str = MSG_ORIG(MSG_STR_EMPTY); } else { /* GNU form */ index_str = index; /* Format the version index value */ (void) snprintf(index, MAXNDXSIZE, MSG_ORIG(MSG_FMT_INDEX), EC_XWORD(vnap->vna_other)); if (vnap->vna_other > versym->max_verndx) versym->max_verndx = vnap->vna_other; } Elf_ver_line_1(0, index_str, name, dep, conv_ver_flags(vnap->vna_flags, 0, &ver_flags_buf)); /* * Print any additional version dependencies. */ if (vcnt) { vnap = (Vernaux *)((uintptr_t)vnap + vnap->vna_next); for (vcnt--; vcnt; vcnt--, vnap = (Vernaux *)((uintptr_t)vnap + vnap->vna_next)) { dep = string(vcache, cnt, scache, file, vnap->vna_name); if (vnap->vna_other > 0) { /* Format the next index value */ (void) snprintf(index, MAXNDXSIZE, MSG_ORIG(MSG_FMT_INDEX), EC_XWORD(vnap->vna_other)); Elf_ver_line_1(0, index, MSG_ORIG(MSG_STR_EMPTY), dep, conv_ver_flags(vnap->vna_flags, 0, &ver_flags_buf)); if (vnap->vna_other > versym->max_verndx) versym->max_verndx = vnap->vna_other; } else { Elf_ver_line_3(0, MSG_ORIG(MSG_STR_EMPTY), dep, conv_ver_flags(vnap->vna_flags, 0, &ver_flags_buf)); } } } } } /* * Examine the Verneed section for information related to GNU * style Versym indexing: * - A non-zero vna_other field indicates that Versym indexes can * reference Verneed records. * - If the object uses GNU style Versym indexing, the * maximum index value is needed to detect bad Versym entries. * * entry: * vnd - Address of verneed data * vnd_num - # of Verneed entries * versym - Information about versym section * * exit: * If a non-zero vna_other field is seen, versym->gnu_needed is set. * * versym->max_verndx has been updated to contain the largest * version index seen. */ static void update_gnu_verndx(Verneed *vnd, Word vnd_num, VERSYM_STATE *versym) { Word cnt; for (cnt = 1; cnt <= vnd_num; cnt++, vnd = (Verneed *)((uintptr_t)vnd + vnd->vn_next)) { Half vcnt = vnd->vn_cnt; Vernaux *vnap = (Vernaux *)((uintptr_t)vnd + vnd->vn_aux); /* * A non-zero value of vna_other indicates that this * object references VERNEED items from the VERSYM * array. */ if (vnap->vna_other != 0) { versym->gnu_needed = 1; if (vnap->vna_other > versym->max_verndx) versym->max_verndx = vnap->vna_other; } /* * Check any additional version dependencies. */ if (vcnt) { vnap = (Vernaux *)((uintptr_t)vnap + vnap->vna_next); for (vcnt--; vcnt; vcnt--, vnap = (Vernaux *)((uintptr_t)vnap + vnap->vna_next)) { if (vnap->vna_other == 0) continue; versym->gnu_needed = 1; if (vnap->vna_other > versym->max_verndx) versym->max_verndx = vnap->vna_other; } } } } /* * Display version section information if the flags require it. * Return version information needed by other output. * * entry: * cache - Cache of all section headers * shnum - # of sections in cache * file - Name of file * flags - Command line option flags * versym - VERSYM_STATE block to be filled in. */ static void versions(Cache *cache, Word shnum, const char *file, uint_t flags, VERSYM_STATE *versym) { GElf_Word cnt; Cache *verdef_cache = NULL, *verneed_cache = NULL; /* Gather information about the version sections */ bzero(versym, sizeof (*versym)); versym->max_verndx = 1; for (cnt = 1; cnt < shnum; cnt++) { Cache *_cache = &cache[cnt]; Shdr *shdr = _cache->c_shdr; Dyn *dyn; ulong_t numdyn; switch (shdr->sh_type) { case SHT_DYNAMIC: /* * The GNU ld puts a DT_VERSYM entry in the dynamic * section so that the runtime linker can use it to * implement their versioning rules. They allow multiple * incompatible functions with the same name to exist * in different versions. The Solaris ld does not * support this mechanism, and as such, does not * produce DT_VERSYM. We use this fact to determine * which ld produced this object, and how to interpret * the version values. */ if ((shdr->sh_entsize == 0) || (shdr->sh_size == 0) || (_cache->c_data == NULL)) continue; numdyn = shdr->sh_size / shdr->sh_entsize; dyn = (Dyn *)_cache->c_data->d_buf; for (; numdyn-- > 0; dyn++) if (dyn->d_tag == DT_VERSYM) { versym->gnu_full = versym->gnu_needed = 1; break; } break; case SHT_SUNW_versym: /* Record data address for later symbol processing */ if (_cache->c_data != NULL) { versym->cache = _cache; versym->data = _cache->c_data->d_buf; continue; } break; case SHT_SUNW_verdef: case SHT_SUNW_verneed: /* * Ensure the data is non-NULL and the number * of items is non-zero. Otherwise, we don't * understand the section, and will not use it. */ if ((_cache->c_data == NULL) || (_cache->c_data->d_buf == NULL)) { (void) fprintf(stderr, MSG_INTL(MSG_ERR_BADSZ), file, _cache->c_name); continue; } if (shdr->sh_info == 0) { (void) fprintf(stderr, MSG_INTL(MSG_ERR_BADSHINFO), file, _cache->c_name, EC_WORD(shdr->sh_info)); continue; } /* Make sure the string table index is in range */ if ((shdr->sh_link == 0) || (shdr->sh_link >= shnum)) { (void) fprintf(stderr, MSG_INTL(MSG_ERR_BADSHLINK), file, _cache->c_name, EC_WORD(shdr->sh_link)); continue; } /* * The section is usable. Save the cache entry. */ if (shdr->sh_type == SHT_SUNW_verdef) { verdef_cache = _cache; /* * Under Solaris rules, if there is a verdef * section, the max versym index is number * of version definitions it supplies. */ versym->max_verndx = shdr->sh_info; } else { verneed_cache = _cache; } break; } } /* * If there is a Verneed section, examine it for information * related to GNU style versioning. */ if (verneed_cache != NULL) update_gnu_verndx((Verneed *)verneed_cache->c_data->d_buf, verneed_cache->c_shdr->sh_info, versym); /* * Now that all the information is available, display the * Verdef and Verneed section contents, if requested. */ if ((flags & FLG_SHOW_VERSIONS) == 0) return; if (verdef_cache != NULL) { dbg_print(0, MSG_ORIG(MSG_STR_EMPTY)); dbg_print(0, MSG_INTL(MSG_ELF_SCN_VERDEF), verdef_cache->c_name); version_def((Verdef *)verdef_cache->c_data->d_buf, verdef_cache->c_shdr->sh_info, verdef_cache, &cache[verdef_cache->c_shdr->sh_link], file); } if (verneed_cache != NULL) { dbg_print(0, MSG_ORIG(MSG_STR_EMPTY)); dbg_print(0, MSG_INTL(MSG_ELF_SCN_VERNEED), verneed_cache->c_name); /* * If GNU versioning applies to this object, version_need() * will update versym->max_verndx, and it is not * necessary to call update_gnu_verndx(). */ version_need((Verneed *)verneed_cache->c_data->d_buf, verneed_cache->c_shdr->sh_info, verneed_cache, &cache[verneed_cache->c_shdr->sh_link], file, versym); } } /* * Initialize a symbol table state structure * * entry: * state - State structure to be initialized * cache - Cache of all section headers * shnum - # of sections in cache * secndx - Index of symbol table section * ehdr - ELF header for file * versym - Information about versym section * file - Name of file * flags - Command line option flags */ static int init_symtbl_state(SYMTBL_STATE *state, Cache *cache, Word shnum, Word secndx, Ehdr *ehdr, VERSYM_STATE *versym, const char *file, uint_t flags) { Shdr *shdr; state->file = file; state->ehdr = ehdr; state->cache = cache; state->shnum = shnum; state->seccache = &cache[secndx]; state->secndx = secndx; state->secname = state->seccache->c_name; state->flags = flags; state->shxndx.checked = 0; state->shxndx.data = NULL; state->shxndx.n = 0; shdr = state->seccache->c_shdr; /* * Check the symbol data and per-item size. */ if ((shdr->sh_entsize == 0) || (shdr->sh_size == 0)) { (void) fprintf(stderr, MSG_INTL(MSG_ERR_BADSZ), file, state->secname); return (0); } if (state->seccache->c_data == NULL) return (0); /* LINTED */ state->symn = (Word)(shdr->sh_size / shdr->sh_entsize); state->sym = (Sym *)state->seccache->c_data->d_buf; /* * Check associated string table section. */ if ((shdr->sh_link == 0) || (shdr->sh_link >= shnum)) { (void) fprintf(stderr, MSG_INTL(MSG_ERR_BADSHLINK), file, state->secname, EC_WORD(shdr->sh_link)); return (0); } /* * Determine if there is a associated Versym section * with this Symbol Table. */ if (versym->cache && (versym->cache->c_shdr->sh_link == state->secndx)) state->versym = versym; else state->versym = NULL; return (1); } /* * Determine the extended section index used for symbol tables entries. */ static void symbols_getxindex(SYMTBL_STATE *state) { uint_t symn; Word symcnt; state->shxndx.checked = 1; /* Note that we've been called */ for (symcnt = 1; symcnt < state->shnum; symcnt++) { Cache *_cache = &state->cache[symcnt]; Shdr *shdr = _cache->c_shdr; if ((shdr->sh_type != SHT_SYMTAB_SHNDX) || (shdr->sh_link != state->secndx)) continue; if ((shdr->sh_entsize) && /* LINTED */ ((symn = (uint_t)(shdr->sh_size / shdr->sh_entsize)) == 0)) continue; if (_cache->c_data == NULL) continue; state->shxndx.data = _cache->c_data->d_buf; state->shxndx.n = symn; return; } } /* * Produce a line of output for the given symbol * * entry: * state - Symbol table state * symndx - Index of symbol within the table * info - Value of st_info (indicates local/global range) * symndx_disp - Index to display. This may not be the same * as symndx if the display is relative to the logical * combination of the SUNW_ldynsym/dynsym tables. * sym - Symbol to display */ static void output_symbol(SYMTBL_STATE *state, Word symndx, Word info, Word disp_symndx, Sym *sym) { /* * Symbol types for which we check that the specified * address/size land inside the target section. */ static const int addr_symtype[] = { 0, /* STT_NOTYPE */ 1, /* STT_OBJECT */ 1, /* STT_FUNC */ 0, /* STT_SECTION */ 0, /* STT_FILE */ 1, /* STT_COMMON */ 0, /* STT_TLS */ 0, /* STT_IFUNC */ 0, /* 8 */ 0, /* 9 */ 0, /* 10 */ 0, /* 11 */ 0, /* 12 */ 0, /* STT_SPARC_REGISTER */ 0, /* 14 */ 0, /* 15 */ }; #if STT_NUM != (STT_IFUNC + 1) #error "STT_NUM has grown. Update addr_symtype[]" #endif char index[MAXNDXSIZE]; const char *symname, *sec; Versym verndx; int gnuver; uchar_t type; Shdr *tshdr; Word shndx; Conv_inv_buf_t inv_buf; /* Ensure symbol index is in range */ if (symndx >= state->symn) { (void) fprintf(stderr, MSG_INTL(MSG_ERR_BADSORTNDX), state->file, state->secname, EC_WORD(symndx)); return; } /* * If we are using extended symbol indexes, find the * corresponding SHN_SYMTAB_SHNDX table. */ if ((sym->st_shndx == SHN_XINDEX) && (state->shxndx.checked == 0)) symbols_getxindex(state); /* LINTED */ symname = string(state->seccache, symndx, &state->cache[state->seccache->c_shdr->sh_link], state->file, sym->st_name); tshdr = NULL; sec = NULL; if (state->ehdr->e_type == ET_CORE) { sec = (char *)MSG_INTL(MSG_STR_UNKNOWN); } else if (state->flags & FLG_CTL_FAKESHDR) { /* * If we are using fake section headers derived from * the program headers, then the section indexes * in the symbols do not correspond to these headers. * The section names are not available, so all we can * do is to display them in numeric form. */ sec = conv_sym_shndx(sym->st_shndx, &inv_buf); } else if ((sym->st_shndx < SHN_LORESERVE) && (sym->st_shndx < state->shnum)) { shndx = sym->st_shndx; tshdr = state->cache[shndx].c_shdr; sec = state->cache[shndx].c_name; } else if (sym->st_shndx == SHN_XINDEX) { if (state->shxndx.data) { Word _shxndx; if (symndx > state->shxndx.n) { (void) fprintf(stderr, MSG_INTL(MSG_ERR_BADSYMXINDEX1), state->file, state->secname, EC_WORD(symndx)); } else if ((_shxndx = state->shxndx.data[symndx]) > state->shnum) { (void) fprintf(stderr, MSG_INTL(MSG_ERR_BADSYMXINDEX2), state->file, state->secname, EC_WORD(symndx), EC_WORD(_shxndx)); } else { shndx = _shxndx; tshdr = state->cache[shndx].c_shdr; sec = state->cache[shndx].c_name; } } else { (void) fprintf(stderr, MSG_INTL(MSG_ERR_BADSYMXINDEX3), state->file, state->secname, EC_WORD(symndx)); } } else if ((sym->st_shndx < SHN_LORESERVE) && (sym->st_shndx >= state->shnum)) { (void) fprintf(stderr, MSG_INTL(MSG_ERR_BADSYM5), state->file, state->secname, EC_WORD(symndx), demangle(symname, state->flags), sym->st_shndx); } /* * If versioning is available display the * version index. If not, then use 0. */ if (state->versym) { Versym test_verndx; verndx = test_verndx = state->versym->data[symndx]; gnuver = state->versym->gnu_full; /* * Check to see if this is a defined symbol with a * version index that is outside the valid range for * the file. The interpretation of this depends on * the style of versioning used by the object. * * Versions >= VER_NDX_LORESERVE have special meanings, * and are exempt from this checking. * * GNU style version indexes use the top bit of the * 16-bit index value (0x8000) as the "hidden bit". * We must mask off this bit in order to compare * the version against the maximum value. */ if (gnuver) test_verndx &= ~0x8000; if ((test_verndx > state->versym->max_verndx) && (verndx < VER_NDX_LORESERVE)) (void) fprintf(stderr, MSG_INTL(MSG_ERR_BADVER), state->file, state->secname, EC_WORD(symndx), EC_HALF(test_verndx), state->versym->max_verndx); } else { verndx = 0; gnuver = 0; } /* * Error checking for TLS. */ type = ELF_ST_TYPE(sym->st_info); if (type == STT_TLS) { if (tshdr && (sym->st_shndx != SHN_UNDEF) && ((tshdr->sh_flags & SHF_TLS) == 0)) { (void) fprintf(stderr, MSG_INTL(MSG_ERR_BADSYM3), state->file, state->secname, EC_WORD(symndx), demangle(symname, state->flags)); } } else if ((type != STT_SECTION) && sym->st_size && tshdr && (tshdr->sh_flags & SHF_TLS)) { (void) fprintf(stderr, MSG_INTL(MSG_ERR_BADSYM4), state->file, state->secname, EC_WORD(symndx), demangle(symname, state->flags)); } /* * If a symbol with non-zero size has a type that * specifies an address, then make sure the location * it references is actually contained within the * section. UNDEF symbols don't count in this case, * so we ignore them. * * The meaning of the st_value field in a symbol * depends on the type of object. For a relocatable * object, it is the offset within the section. * For sharable objects, it is the offset relative to * the base of the object, and for other types, it is * the virtual address. To get an offset within the * section for non-ET_REL files, we subtract the * base address of the section. */ if (addr_symtype[type] && (sym->st_size > 0) && (sym->st_shndx != SHN_UNDEF) && ((sym->st_shndx < SHN_LORESERVE) || (sym->st_shndx == SHN_XINDEX)) && (tshdr != NULL)) { Word v = sym->st_value; if (state->ehdr->e_type != ET_REL) v -= tshdr->sh_addr; if (((v + sym->st_size) > tshdr->sh_size)) { (void) fprintf(stderr, MSG_INTL(MSG_ERR_BADSYM6), state->file, state->secname, EC_WORD(symndx), demangle(symname, state->flags), EC_WORD(shndx), EC_XWORD(tshdr->sh_size), EC_XWORD(sym->st_value), EC_XWORD(sym->st_size)); } } /* * A typical symbol table uses the sh_info field to indicate one greater * than the symbol table index of the last local symbol, STB_LOCAL. * Therefore, symbol indexes less than sh_info should have local * binding. Symbol indexes greater than, or equal to sh_info, should * have global binding. Note, we exclude UNDEF/NOTY symbols with zero * value and size, as these symbols may be the result of an mcs(1) * section deletion. */ if (info) { uchar_t bind = ELF_ST_BIND(sym->st_info); if ((symndx < info) && (bind != STB_LOCAL)) { (void) fprintf(stderr, MSG_INTL(MSG_ERR_BADSYM7), state->file, state->secname, EC_WORD(symndx), demangle(symname, state->flags), EC_XWORD(info)); } else if ((symndx >= info) && (bind == STB_LOCAL) && ((sym->st_shndx != SHN_UNDEF) || (ELF_ST_TYPE(sym->st_info) != STT_NOTYPE) || (sym->st_size != 0) || (sym->st_value != 0))) { (void) fprintf(stderr, MSG_INTL(MSG_ERR_BADSYM8), state->file, state->secname, EC_WORD(symndx), demangle(symname, state->flags), EC_XWORD(info)); } } (void) snprintf(index, MAXNDXSIZE, MSG_ORIG(MSG_FMT_INDEX), EC_XWORD(disp_symndx)); Elf_syms_table_entry(0, ELF_DBG_ELFDUMP, index, state->ehdr->e_machine, sym, verndx, gnuver, sec, symname); } /* * Search for and process any symbol tables. */ void symbols(Cache *cache, Word shnum, Ehdr *ehdr, VERSYM_STATE *versym, const char *file, uint_t flags) { SYMTBL_STATE state; Cache *_cache; Word secndx; for (secndx = 1; secndx < shnum; secndx++) { Word symcnt; Shdr *shdr; _cache = &cache[secndx]; shdr = _cache->c_shdr; if ((shdr->sh_type != SHT_SYMTAB) && (shdr->sh_type != SHT_DYNSYM) && (shdr->sh_type != SHT_SUNW_LDYNSYM)) continue; if (!match(MATCH_F_ALL, _cache->c_name, secndx, shdr->sh_type)) continue; if (!init_symtbl_state(&state, cache, shnum, secndx, ehdr, versym, file, flags)) continue; /* * Loop through the symbol tables entries. */ dbg_print(0, MSG_ORIG(MSG_STR_EMPTY)); dbg_print(0, MSG_INTL(MSG_ELF_SCN_SYMTAB), state.secname); Elf_syms_table_title(0, ELF_DBG_ELFDUMP); for (symcnt = 0; symcnt < state.symn; symcnt++) output_symbol(&state, symcnt, shdr->sh_info, symcnt, state.sym + symcnt); } } /* * Search for and process any SHT_SUNW_symsort or SHT_SUNW_tlssort sections. * These sections are always associated with the .SUNW_ldynsym./.dynsym pair. */ static void sunw_sort(Cache *cache, Word shnum, Ehdr *ehdr, VERSYM_STATE *versym, const char *file, uint_t flags) { SYMTBL_STATE ldynsym_state, dynsym_state; Cache *sortcache, *symcache; Shdr *sortshdr, *symshdr; Word sortsecndx, symsecndx; Word ldynsym_cnt; Word *ndx; Word ndxn; int output_cnt = 0; Conv_inv_buf_t inv_buf; for (sortsecndx = 1; sortsecndx < shnum; sortsecndx++) { sortcache = &cache[sortsecndx]; sortshdr = sortcache->c_shdr; if ((sortshdr->sh_type != SHT_SUNW_symsort) && (sortshdr->sh_type != SHT_SUNW_tlssort)) continue; if (!match(MATCH_F_ALL, sortcache->c_name, sortsecndx, sortshdr->sh_type)) continue; /* * If the section references a SUNW_ldynsym, then we * expect to see the associated .dynsym immediately * following. If it references a .dynsym, there is no * SUNW_ldynsym. If it is any other type, then we don't * know what to do with it. */ if ((sortshdr->sh_link == 0) || (sortshdr->sh_link >= shnum)) { (void) fprintf(stderr, MSG_INTL(MSG_ERR_BADSHLINK), file, sortcache->c_name, EC_WORD(sortshdr->sh_link)); continue; } symcache = &cache[sortshdr->sh_link]; symshdr = symcache->c_shdr; symsecndx = sortshdr->sh_link; ldynsym_cnt = 0; switch (symshdr->sh_type) { case SHT_SUNW_LDYNSYM: if (!init_symtbl_state(&ldynsym_state, cache, shnum, symsecndx, ehdr, versym, file, flags)) continue; ldynsym_cnt = ldynsym_state.symn; /* * We know that the dynsym follows immediately * after the SUNW_ldynsym, and so, should be at * (sortshdr->sh_link + 1). However, elfdump is a * diagnostic tool, so we do the full paranoid * search instead. */ for (symsecndx = 1; symsecndx < shnum; symsecndx++) { symcache = &cache[symsecndx]; symshdr = symcache->c_shdr; if (symshdr->sh_type == SHT_DYNSYM) break; } if (symsecndx >= shnum) { /* Dynsym not found! */ (void) fprintf(stderr, MSG_INTL(MSG_ERR_NODYNSYM), file, sortcache->c_name); continue; } /* Fallthrough to process associated dynsym */ /* FALLTHROUGH */ case SHT_DYNSYM: if (!init_symtbl_state(&dynsym_state, cache, shnum, symsecndx, ehdr, versym, file, flags)) continue; break; default: (void) fprintf(stderr, MSG_INTL(MSG_ERR_BADNDXSEC), file, sortcache->c_name, conv_sec_type( ehdr->e_machine, symshdr->sh_type, 0, &inv_buf)); continue; } /* * Output header */ dbg_print(0, MSG_ORIG(MSG_STR_EMPTY)); if (ldynsym_cnt > 0) { dbg_print(0, MSG_INTL(MSG_ELF_SCN_SYMSORT2), sortcache->c_name, ldynsym_state.secname, dynsym_state.secname); /* * The data for .SUNW_ldynsym and dynsym sections * is supposed to be adjacent with SUNW_ldynsym coming * first. Check, and issue a warning if it isn't so. */ if (((ldynsym_state.sym + ldynsym_state.symn) != dynsym_state.sym) && ((flags & FLG_CTL_FAKESHDR) == 0)) (void) fprintf(stderr, MSG_INTL(MSG_ERR_LDYNNOTADJ), file, ldynsym_state.secname, dynsym_state.secname); } else { dbg_print(0, MSG_INTL(MSG_ELF_SCN_SYMSORT1), sortcache->c_name, dynsym_state.secname); } Elf_syms_table_title(0, ELF_DBG_ELFDUMP); /* If not first one, insert a line of whitespace */ if (output_cnt++ > 0) dbg_print(0, MSG_ORIG(MSG_STR_EMPTY)); /* * SUNW_dynsymsort and SUNW_dyntlssort are arrays of * symbol indices. Iterate over the array entries, * dispaying the referenced symbols. */ ndxn = sortshdr->sh_size / sortshdr->sh_entsize; ndx = (Word *)sortcache->c_data->d_buf; for (; ndxn-- > 0; ndx++) { if (*ndx >= ldynsym_cnt) { Word sec_ndx = *ndx - ldynsym_cnt; output_symbol(&dynsym_state, sec_ndx, 0, *ndx, dynsym_state.sym + sec_ndx); } else { output_symbol(&ldynsym_state, *ndx, 0, *ndx, ldynsym_state.sym + *ndx); } } } } /* * Search for and process any relocation sections. */ static void reloc(Cache *cache, Word shnum, Ehdr *ehdr, const char *file) { Word cnt; for (cnt = 1; cnt < shnum; cnt++) { Word type, symnum; Xword relndx, relnum, relsize; void *rels; Sym *syms; Cache *symsec, *strsec; Cache *_cache = &cache[cnt]; Shdr *shdr = _cache->c_shdr; char *relname = _cache->c_name; Conv_inv_buf_t inv_buf; if (((type = shdr->sh_type) != SHT_RELA) && (type != SHT_REL)) continue; if (!match(MATCH_F_ALL, relname, cnt, type)) continue; /* * Decide entry size. */ if (((relsize = shdr->sh_entsize) == 0) || (relsize > shdr->sh_size)) { if (type == SHT_RELA) relsize = sizeof (Rela); else relsize = sizeof (Rel); } /* * Determine the number of relocations available. */ if (shdr->sh_size == 0) { (void) fprintf(stderr, MSG_INTL(MSG_ERR_BADSZ), file, relname); continue; } if (_cache->c_data == NULL) continue; rels = _cache->c_data->d_buf; relnum = shdr->sh_size / relsize; /* * Get the data buffer for the associated symbol table and * string table. */ if (stringtbl(cache, 1, cnt, shnum, file, &symnum, &symsec, &strsec) == 0) continue; syms = symsec->c_data->d_buf; /* * Loop through the relocation entries. */ dbg_print(0, MSG_ORIG(MSG_STR_EMPTY)); dbg_print(0, MSG_INTL(MSG_ELF_SCN_RELOC), _cache->c_name); Elf_reloc_title(0, ELF_DBG_ELFDUMP, type); for (relndx = 0; relndx < relnum; relndx++, rels = (void *)((char *)rels + relsize)) { Half mach = ehdr->e_machine; char section[BUFSIZ]; const char *symname; Word symndx, reltype; Rela *rela; Rel *rel; /* * Unravel the relocation and determine the symbol with * which this relocation is associated. */ if (type == SHT_RELA) { rela = (Rela *)rels; symndx = ELF_R_SYM(rela->r_info); reltype = ELF_R_TYPE(rela->r_info, mach); } else { rel = (Rel *)rels; symndx = ELF_R_SYM(rel->r_info); reltype = ELF_R_TYPE(rel->r_info, mach); } symname = relsymname(cache, _cache, strsec, symndx, symnum, relndx, syms, section, BUFSIZ, file); /* * A zero symbol index is only valid for a few * relocations. */ if (symndx == 0) { int badrel = 0; if ((mach == EM_SPARC) || (mach == EM_SPARC32PLUS) || (mach == EM_SPARCV9)) { if ((reltype != R_SPARC_NONE) && (reltype != R_SPARC_REGISTER) && (reltype != R_SPARC_RELATIVE)) badrel++; } else if (mach == EM_386) { if ((reltype != R_386_NONE) && (reltype != R_386_RELATIVE)) badrel++; } else if (mach == EM_AMD64) { if ((reltype != R_AMD64_NONE) && (reltype != R_AMD64_RELATIVE)) badrel++; } if (badrel) { (void) fprintf(stderr, MSG_INTL(MSG_ERR_BADREL1), file, conv_reloc_type(mach, reltype, 0, &inv_buf)); } } Elf_reloc_entry_1(0, ELF_DBG_ELFDUMP, MSG_ORIG(MSG_STR_EMPTY), ehdr->e_machine, type, rels, relname, symname, 0); } } } /* * This value controls which test dyn_test() performs. */ typedef enum { DYN_TEST_ADDR, DYN_TEST_SIZE, DYN_TEST_ENTSIZE } dyn_test_t; /* * Used by dynamic() to compare the value of a dynamic element against * the starting address of the section it references. * * entry: * test_type - Specify which dyn item is being tested. * sh_type - SHT_* type value for required section. * sec_cache - Cache entry for section, or NULL if the object lacks * a section of this type. * dyn - Dyn entry to be tested * dynsec_cnt - # of dynamic section being examined. The first * dynamic section is 1, the next is 2, and so on... * ehdr - ELF header for file * file - Name of file */ static void dyn_test(dyn_test_t test_type, Word sh_type, Cache *sec_cache, Dyn *dyn, Word dynsec_cnt, Ehdr *ehdr, const char *file) { Conv_inv_buf_t buf1, buf2; /* * These tests are based around the implicit assumption that * there is only one dynamic section in an object, and also only * one of the sections it references. We have therefore gathered * all of the necessary information to test this in a single pass * over the section headers, which is very efficient. We are not * aware of any case where more than one dynamic section would * be meaningful in an ELF object, so this is a reasonable solution. * * To test multiple dynamic sections correctly would be more * expensive in code and time. We would have to build a data structure * containing all the dynamic elements. Then, we would use the address * to locate the section it references and ensure the section is of * the right type and that the address in the dynamic element is * to the start of the section. Then, we could check the size and * entsize values against those same sections. This is O(n^2), and * also complicated. * * In the highly unlikely case that there is more than one dynamic * section, we only test the first one, and simply allow the values * of the subsequent one to be displayed unchallenged. */ if (dynsec_cnt != 1) return; /* * A DT_ item that references a section address should always find * the section in the file. */ if (sec_cache == NULL) { const char *name; /* * Supply section names instead of section types for * things that reference progbits so that the error * message will make more sense. */ switch (dyn->d_tag) { case DT_INIT: name = MSG_ORIG(MSG_ELF_INIT); break; case DT_FINI: name = MSG_ORIG(MSG_ELF_FINI); break; default: name = conv_sec_type(ehdr->e_machine, sh_type, 0, &buf1); break; } (void) fprintf(stderr, MSG_INTL(MSG_ERR_DYNNOBCKSEC), file, name, conv_dyn_tag(dyn->d_tag, ehdr->e_machine, 0, &buf2)); return; } switch (test_type) { case DYN_TEST_ADDR: /* The section address should match the DT_ item value */ if (dyn->d_un.d_val != sec_cache->c_shdr->sh_addr) (void) fprintf(stderr, MSG_INTL(MSG_ERR_DYNBADADDR), file, conv_dyn_tag(dyn->d_tag, ehdr->e_machine, 0, &buf1), EC_ADDR(dyn->d_un.d_val), sec_cache->c_ndx, sec_cache->c_name, EC_ADDR(sec_cache->c_shdr->sh_addr)); break; case DYN_TEST_SIZE: /* The section size should match the DT_ item value */ if (dyn->d_un.d_val != sec_cache->c_shdr->sh_size) (void) fprintf(stderr, MSG_INTL(MSG_ERR_DYNBADSIZE), file, conv_dyn_tag(dyn->d_tag, ehdr->e_machine, 0, &buf1), EC_XWORD(dyn->d_un.d_val), sec_cache->c_ndx, sec_cache->c_name, EC_XWORD(sec_cache->c_shdr->sh_size)); break; case DYN_TEST_ENTSIZE: /* The sh_entsize value should match the DT_ item value */ if (dyn->d_un.d_val != sec_cache->c_shdr->sh_entsize) (void) fprintf(stderr, MSG_INTL(MSG_ERR_DYNBADENTSIZE), file, conv_dyn_tag(dyn->d_tag, ehdr->e_machine, 0, &buf1), EC_XWORD(dyn->d_un.d_val), sec_cache->c_ndx, sec_cache->c_name, EC_XWORD(sec_cache->c_shdr->sh_entsize)); break; } } /* * There are some DT_ entries that have corresponding symbols * (e.g. DT_INIT and _init). It is expected that these items will * both have the same value if both are present. This routine * examines the well known symbol tables for such symbols and * issues warnings for any that don't match. * * entry: * dyn - Dyn entry to be tested * symname - Name of symbol that corresponds to dyn * symtab_cache, dynsym_cache, ldynsym_cache - Symbol tables to check * cache - Cache of all section headers * shnum - # of sections in cache * ehdr - ELF header for file * file - Name of file */ static void dyn_symtest(Dyn *dyn, const char *symname, Cache *symtab_cache, Cache *dynsym_cache, Cache *ldynsym_cache, Cache *cache, Word shnum, Ehdr *ehdr, const char *file) { Conv_inv_buf_t buf; int i; Sym *sym; Cache *_cache; for (i = 0; i < 3; i++) { switch (i) { case 0: _cache = symtab_cache; break; case 1: _cache = dynsym_cache; break; case 2: _cache = ldynsym_cache; break; } if ((_cache != NULL) && symlookup(symname, cache, shnum, &sym, _cache, file) && (sym->st_value != dyn->d_un.d_val)) (void) fprintf(stderr, MSG_INTL(MSG_ERR_DYNSYMVAL), file, _cache->c_name, conv_dyn_tag(dyn->d_tag, ehdr->e_machine, 0, &buf), symname, EC_ADDR(sym->st_value)); } } /* * Search for and process a .dynamic section. */ static void dynamic(Cache *cache, Word shnum, Ehdr *ehdr, const char *file) { struct { Cache *symtab; Cache *dynstr; Cache *dynsym; Cache *hash; Cache *fini; Cache *fini_array; Cache *init; Cache *init_array; Cache *preinit_array; Cache *rel; Cache *rela; Cache *sunw_cap; Cache *sunw_ldynsym; Cache *sunw_move; Cache *sunw_syminfo; Cache *sunw_symsort; Cache *sunw_tlssort; Cache *sunw_verdef; Cache *sunw_verneed; Cache *sunw_versym; } sec; Word dynsec_ndx; Word dynsec_num; int dynsec_cnt; Word cnt; /* * Make a pass over all the sections, gathering section information * we'll need below. */ dynsec_num = 0; bzero(&sec, sizeof (sec)); for (cnt = 1; cnt < shnum; cnt++) { Cache *_cache = &cache[cnt]; switch (_cache->c_shdr->sh_type) { case SHT_DYNAMIC: if (dynsec_num == 0) { dynsec_ndx = cnt; /* Does it have a valid string table? */ (void) stringtbl(cache, 0, cnt, shnum, file, 0, 0, &sec.dynstr); } dynsec_num++; break; case SHT_PROGBITS: /* * We want to detect the .init and .fini sections, * if present. These are SHT_PROGBITS, so all we * have to go on is the section name. Normally comparing * names is a bad idea, but there are some special * names (i.e. .init/.fini/.interp) that are very * difficult to use in any other context, and for * these symbols, we do the heuristic match. */ if (strcmp(_cache->c_name, MSG_ORIG(MSG_ELF_INIT)) == 0) { if (sec.init == NULL) sec.init = _cache; } else if (strcmp(_cache->c_name, MSG_ORIG(MSG_ELF_FINI)) == 0) { if (sec.fini == NULL) sec.fini = _cache; } break; case SHT_REL: /* * We want the SHT_REL section with the lowest * offset. The linker gathers them together, * and puts the address of the first one * into the DT_REL dynamic element. */ if ((sec.rel == NULL) || (_cache->c_shdr->sh_offset < sec.rel->c_shdr->sh_offset)) sec.rel = _cache; break; case SHT_RELA: /* RELA is handled just like RELA above */ if ((sec.rela == NULL) || (_cache->c_shdr->sh_offset < sec.rela->c_shdr->sh_offset)) sec.rela = _cache; break; /* * The GRAB macro is used for the simple case in which * we simply grab the first section of the desired type. */ #define GRAB(_sec_type, _sec_field) \ case _sec_type: \ if (sec._sec_field == NULL) \ sec._sec_field = _cache; \ break GRAB(SHT_SYMTAB, symtab); GRAB(SHT_DYNSYM, dynsym); GRAB(SHT_FINI_ARRAY, fini_array); GRAB(SHT_HASH, hash); GRAB(SHT_INIT_ARRAY, init_array); GRAB(SHT_SUNW_move, sunw_move); GRAB(SHT_PREINIT_ARRAY, preinit_array); GRAB(SHT_SUNW_cap, sunw_cap); GRAB(SHT_SUNW_LDYNSYM, sunw_ldynsym); GRAB(SHT_SUNW_syminfo, sunw_syminfo); GRAB(SHT_SUNW_symsort, sunw_symsort); GRAB(SHT_SUNW_tlssort, sunw_tlssort); GRAB(SHT_SUNW_verdef, sunw_verdef); GRAB(SHT_SUNW_verneed, sunw_verneed); GRAB(SHT_SUNW_versym, sunw_versym); #undef GRAB } } /* * If no dynamic section, return immediately. If more than one * dynamic section, then something odd is going on and an error * is in order, but then continue on and display them all. */ if (dynsec_num == 0) return; if (dynsec_num > 1) (void) fprintf(stderr, MSG_INTL(MSG_ERR_MULTDYN), file, EC_WORD(dynsec_num)); dynsec_cnt = 0; for (cnt = dynsec_ndx; (cnt < shnum) && (dynsec_cnt < dynsec_num); cnt++) { Dyn *dyn; ulong_t numdyn; int ndx, end_ndx; Cache *_cache = &cache[cnt], *strsec; Shdr *shdr = _cache->c_shdr; int dumped = 0; if (shdr->sh_type != SHT_DYNAMIC) continue; dynsec_cnt++; /* * Verify the associated string table section. */ if (stringtbl(cache, 0, cnt, shnum, file, 0, 0, &strsec) == 0) continue; if ((shdr->sh_entsize == 0) || (shdr->sh_size == 0)) { (void) fprintf(stderr, MSG_INTL(MSG_ERR_BADSZ), file, _cache->c_name); continue; } if (_cache->c_data == NULL) continue; numdyn = shdr->sh_size / shdr->sh_entsize; dyn = (Dyn *)_cache->c_data->d_buf; /* * We expect the REL/RELA entries to reference the reloc * section with the lowest address. However, this is * not true for dumped objects. Detect if this object has * been dumped so that we can skip the reloc address test * in that case. */ for (ndx = 0; ndx < numdyn; dyn++, ndx++) { if (dyn->d_tag == DT_FLAGS_1) { dumped = (dyn->d_un.d_val & DF_1_CONFALT) != 0; break; } } dyn = (Dyn *)_cache->c_data->d_buf; dbg_print(0, MSG_ORIG(MSG_STR_EMPTY)); dbg_print(0, MSG_INTL(MSG_ELF_SCN_DYNAMIC), _cache->c_name); Elf_dyn_title(0); for (ndx = 0; ndx < numdyn; dyn++, ndx++) { union { Conv_inv_buf_t inv; Conv_dyn_flag_buf_t flag; Conv_dyn_flag1_buf_t flag1; Conv_dyn_posflag1_buf_t posflag1; Conv_dyn_feature1_buf_t feature1; } c_buf; const char *name = NULL; /* * Print the information numerically, and if possible * as a string. If a string is available, name is * set to reference it. * * Also, take this opportunity to sanity check * the values of DT elements. In the code above, * we gathered information on sections that are * referenced by the dynamic section. Here, we * compare the attributes of those sections to * the DT_ items that reference them and report * on inconsistencies. * * Things not currently tested that could be improved * in later revisions include: * - We don't check PLT or GOT related items * - We don't handle computing the lengths of * relocation arrays. To handle this * requires examining data that spans * across sections, in a contiguous span * within a single segment. * - DT_VERDEFNUM and DT_VERNEEDNUM can't be * verified without parsing the sections. * - We don't handle DT_SUNW_SYMSZ, which would * be the sum of the lengths of .dynsym and * .SUNW_ldynsym * - DT_SUNW_STRPAD can't be verified other than * to check that it's not larger than * the string table. * - Some items come in "all or none" clusters * that give an address, element size, * and data length in bytes. We don't * verify that there are no missing items * in such groups. */ switch (dyn->d_tag) { case DT_NULL: /* * Special case: DT_NULLs can come in groups * that we prefer to reduce to a single line. */ end_ndx = ndx; while ((end_ndx < (numdyn - 1)) && ((dyn + 1)->d_tag == DT_NULL)) { dyn++; end_ndx++; } Elf_dyn_null_entry(0, dyn, ndx, end_ndx); ndx = end_ndx; continue; /* * String items all reference the dynstr. The string() * function does the necessary sanity checking. */ case DT_NEEDED: case DT_SONAME: case DT_FILTER: case DT_AUXILIARY: case DT_CONFIG: case DT_RPATH: case DT_RUNPATH: case DT_USED: case DT_DEPAUDIT: case DT_AUDIT: case DT_SUNW_AUXILIARY: case DT_SUNW_FILTER: name = string(_cache, ndx, strsec, file, dyn->d_un.d_ptr); break; case DT_FLAGS: name = conv_dyn_flag(dyn->d_un.d_val, 0, &c_buf.flag); break; case DT_FLAGS_1: name = conv_dyn_flag1(dyn->d_un.d_val, 0, &c_buf.flag1); break; case DT_POSFLAG_1: name = conv_dyn_posflag1(dyn->d_un.d_val, 0, &c_buf.posflag1); break; case DT_FEATURE_1: name = conv_dyn_feature1(dyn->d_un.d_val, 0, &c_buf.feature1); break; case DT_DEPRECATED_SPARC_REGISTER: name = MSG_INTL(MSG_STR_DEPRECATED); break; case DT_SUNW_LDMACH: name = conv_ehdr_mach((Half)dyn->d_un.d_val, 0, &c_buf.inv); break; /* * Cases below this point are strictly sanity checking, * and do not generate a name string. The TEST_ macros * are used to hide the boilerplate arguments neeeded * by dyn_test(). */ #define TEST_ADDR(_sh_type, _sec_field) \ dyn_test(DYN_TEST_ADDR, _sh_type, \ sec._sec_field, dyn, dynsec_cnt, ehdr, file) #define TEST_SIZE(_sh_type, _sec_field) \ dyn_test(DYN_TEST_SIZE, _sh_type, \ sec._sec_field, dyn, dynsec_cnt, ehdr, file) #define TEST_ENTSIZE(_sh_type, _sec_field) \ dyn_test(DYN_TEST_ENTSIZE, _sh_type, \ sec._sec_field, dyn, dynsec_cnt, ehdr, file) case DT_FINI: dyn_symtest(dyn, MSG_ORIG(MSG_SYM_FINI), sec.symtab, sec.dynsym, sec.sunw_ldynsym, cache, shnum, ehdr, file); TEST_ADDR(SHT_PROGBITS, fini); break; case DT_FINI_ARRAY: TEST_ADDR(SHT_FINI_ARRAY, fini_array); break; case DT_FINI_ARRAYSZ: TEST_SIZE(SHT_FINI_ARRAY, fini_array); break; case DT_HASH: TEST_ADDR(SHT_HASH, hash); break; case DT_INIT: dyn_symtest(dyn, MSG_ORIG(MSG_SYM_INIT), sec.symtab, sec.dynsym, sec.sunw_ldynsym, cache, shnum, ehdr, file); TEST_ADDR(SHT_PROGBITS, init); break; case DT_INIT_ARRAY: TEST_ADDR(SHT_INIT_ARRAY, init_array); break; case DT_INIT_ARRAYSZ: TEST_SIZE(SHT_INIT_ARRAY, init_array); break; case DT_MOVEENT: TEST_ENTSIZE(SHT_SUNW_move, sunw_move); break; case DT_MOVESZ: TEST_SIZE(SHT_SUNW_move, sunw_move); break; case DT_MOVETAB: TEST_ADDR(SHT_SUNW_move, sunw_move); break; case DT_PREINIT_ARRAY: TEST_ADDR(SHT_PREINIT_ARRAY, preinit_array); break; case DT_PREINIT_ARRAYSZ: TEST_SIZE(SHT_PREINIT_ARRAY, preinit_array); break; case DT_REL: if (!dumped) TEST_ADDR(SHT_REL, rel); break; case DT_RELENT: TEST_ENTSIZE(SHT_REL, rel); break; case DT_RELA: if (!dumped) TEST_ADDR(SHT_RELA, rela); break; case DT_RELAENT: TEST_ENTSIZE(SHT_RELA, rela); break; case DT_STRTAB: TEST_ADDR(SHT_STRTAB, dynstr); break; case DT_STRSZ: TEST_SIZE(SHT_STRTAB, dynstr); break; case DT_SUNW_CAP: TEST_ADDR(SHT_SUNW_cap, sunw_cap); break; case DT_SUNW_SYMTAB: TEST_ADDR(SHT_SUNW_LDYNSYM, sunw_ldynsym); break; case DT_SYMENT: TEST_ENTSIZE(SHT_DYNSYM, dynsym); break; case DT_SYMINENT: TEST_ENTSIZE(SHT_SUNW_syminfo, sunw_syminfo); break; case DT_SYMINFO: TEST_ADDR(SHT_SUNW_syminfo, sunw_syminfo); break; case DT_SYMINSZ: TEST_SIZE(SHT_SUNW_syminfo, sunw_syminfo); break; case DT_SYMTAB: TEST_ADDR(SHT_DYNSYM, dynsym); break; case DT_SUNW_SORTENT: /* * This entry is related to both the symsort and * tlssort sections. */ { int test_tls = (sec.sunw_tlssort != NULL); int test_sym = (sec.sunw_symsort != NULL) || !test_tls; if (test_sym) TEST_ENTSIZE(SHT_SUNW_symsort, sunw_symsort); if (test_tls) TEST_ENTSIZE(SHT_SUNW_tlssort, sunw_tlssort); } break; case DT_SUNW_SYMSORT: TEST_ADDR(SHT_SUNW_symsort, sunw_symsort); break; case DT_SUNW_SYMSORTSZ: TEST_SIZE(SHT_SUNW_symsort, sunw_symsort); break; case DT_SUNW_TLSSORT: TEST_ADDR(SHT_SUNW_tlssort, sunw_tlssort); break; case DT_SUNW_TLSSORTSZ: TEST_SIZE(SHT_SUNW_tlssort, sunw_tlssort); break; case DT_VERDEF: TEST_ADDR(SHT_SUNW_verdef, sunw_verdef); break; case DT_VERNEED: TEST_ADDR(SHT_SUNW_verneed, sunw_verneed); break; case DT_VERSYM: TEST_ADDR(SHT_SUNW_versym, sunw_versym); break; #undef TEST_ADDR #undef TEST_SIZE #undef TEST_ENTSIZE } if (name == NULL) name = MSG_ORIG(MSG_STR_EMPTY); Elf_dyn_entry(0, dyn, ndx, name, ehdr->e_machine); } } } /* * Search for and process a MOVE section. */ static void move(Cache *cache, Word shnum, const char *file, uint_t flags) { Word cnt; const char *fmt = NULL; for (cnt = 1; cnt < shnum; cnt++) { Word movenum, symnum, ndx; Sym *syms; Cache *_cache = &cache[cnt]; Shdr *shdr = _cache->c_shdr; Cache *symsec, *strsec; Move *move; if (shdr->sh_type != SHT_SUNW_move) continue; if (!match(MATCH_F_ALL, _cache->c_name, cnt, shdr->sh_type)) continue; /* * Determine the move data and number. */ if ((shdr->sh_entsize == 0) || (shdr->sh_size == 0)) { (void) fprintf(stderr, MSG_INTL(MSG_ERR_BADSZ), file, _cache->c_name); continue; } if (_cache->c_data == NULL) continue; move = (Move *)_cache->c_data->d_buf; movenum = shdr->sh_size / shdr->sh_entsize; /* * Get the data buffer for the associated symbol table and * string table. */ if (stringtbl(cache, 1, cnt, shnum, file, &symnum, &symsec, &strsec) == 0) return; syms = (Sym *)symsec->c_data->d_buf; dbg_print(0, MSG_ORIG(MSG_STR_EMPTY)); dbg_print(0, MSG_INTL(MSG_ELF_SCN_MOVE), _cache->c_name); dbg_print(0, MSG_INTL(MSG_MOVE_TITLE)); if (fmt == NULL) fmt = MSG_INTL(MSG_MOVE_ENTRY); for (ndx = 0; ndx < movenum; move++, ndx++) { const char *symname; char index[MAXNDXSIZE], section[BUFSIZ]; Word symndx, shndx; Sym *sym; /* * Check for null entries */ if ((move->m_info == 0) && (move->m_value == 0) && (move->m_poffset == 0) && (move->m_repeat == 0) && (move->m_stride == 0)) { dbg_print(0, fmt, MSG_ORIG(MSG_STR_EMPTY), EC_XWORD(move->m_poffset), 0, 0, 0, EC_LWORD(0), MSG_ORIG(MSG_STR_EMPTY)); continue; } if (((symndx = ELF_M_SYM(move->m_info)) == 0) || (symndx >= symnum)) { (void) fprintf(stderr, MSG_INTL(MSG_ERR_BADMINFO), file, _cache->c_name, EC_XWORD(move->m_info)); (void) snprintf(index, MAXNDXSIZE, MSG_ORIG(MSG_FMT_INDEX), EC_XWORD(symndx)); dbg_print(0, fmt, index, EC_XWORD(move->m_poffset), ELF_M_SIZE(move->m_info), move->m_repeat, move->m_stride, move->m_value, MSG_INTL(MSG_STR_UNKNOWN)); continue; } symname = relsymname(cache, _cache, strsec, symndx, symnum, ndx, syms, section, BUFSIZ, file); sym = (Sym *)(syms + symndx); /* * Additional sanity check. */ shndx = sym->st_shndx; if (!((shndx == SHN_COMMON) || (((shndx >= 1) && (shndx <= shnum)) && (cache[shndx].c_shdr)->sh_type == SHT_NOBITS))) { (void) fprintf(stderr, MSG_INTL(MSG_ERR_BADSYM2), file, _cache->c_name, EC_WORD(symndx), demangle(symname, flags)); } (void) snprintf(index, MAXNDXSIZE, MSG_ORIG(MSG_FMT_INDEX), EC_XWORD(symndx)); dbg_print(0, fmt, index, EC_XWORD(move->m_poffset), ELF_M_SIZE(move->m_info), move->m_repeat, move->m_stride, move->m_value, demangle(symname, flags)); } } } /* * Callback function for use with conv_str_to_c_literal() below. */ /*ARGSUSED2*/ static void c_literal_cb(const void *ptr, size_t size, void *uvalue) { (void) fwrite(ptr, size, 1, stdout); } /* * Traverse a note section analyzing each note information block. * The data buffers size is used to validate references before they are made, * and is decremented as each element is processed. */ void note_entry(Cache *cache, Word *data, size_t size, Ehdr *ehdr, const char *file) { size_t bsize = size; int cnt = 0; int is_corenote; int do_swap; Conv_inv_buf_t inv_buf; do_swap = _elf_sys_encoding() != ehdr->e_ident[EI_DATA]; /* * Print out a single `note' information block. */ while (size > 0) { size_t namesz, descsz, type, pad, noteoff; noteoff = bsize - size; /* * Make sure we can at least reference the 3 initial entries * (4-byte words) of the note information block. */ if (size >= (sizeof (Word) * 3)) size -= (sizeof (Word) * 3); else { (void) fprintf(stderr, MSG_INTL(MSG_NOTE_BADDATASZ), file, cache->c_name, EC_WORD(noteoff)); return; } /* * Make sure any specified name string can be referenced. */ if ((namesz = *data++) != 0) { if (size >= namesz) size -= namesz; else { (void) fprintf(stderr, MSG_INTL(MSG_NOTE_BADNMSZ), file, cache->c_name, EC_WORD(noteoff), EC_WORD(namesz)); return; } } /* * Make sure any specified descriptor can be referenced. */ if ((descsz = *data++) != 0) { /* * If namesz isn't a 4-byte multiple, account for any * padding that must exist before the descriptor. */ if ((pad = (namesz & (sizeof (Word) - 1))) != 0) { pad = sizeof (Word) - pad; size -= pad; } if (size >= descsz) size -= descsz; else { (void) fprintf(stderr, MSG_INTL(MSG_NOTE_BADDESZ), file, cache->c_name, EC_WORD(noteoff), EC_WORD(namesz)); return; } } type = *data++; /* * Is this a Solaris core note? Such notes all have * the name "CORE". */ is_corenote = (ehdr->e_type == ET_CORE) && (namesz == (MSG_STR_CORE_SIZE + 1)) && (strncmp(MSG_ORIG(MSG_STR_CORE), (char *)data, MSG_STR_CORE_SIZE + 1) == 0); dbg_print(0, MSG_ORIG(MSG_STR_EMPTY)); dbg_print(0, MSG_INTL(MSG_FMT_NOTEENTNDX), EC_WORD(cnt)); cnt++; dbg_print(0, MSG_ORIG(MSG_NOTE_NAMESZ), EC_WORD(namesz)); dbg_print(0, MSG_ORIG(MSG_NOTE_DESCSZ), EC_WORD(descsz)); if (is_corenote) dbg_print(0, MSG_ORIG(MSG_NOTE_TYPE_STR), conv_cnote_type(type, 0, &inv_buf)); else dbg_print(0, MSG_ORIG(MSG_NOTE_TYPE), EC_WORD(type)); if (namesz) { char *name = (char *)data; dbg_print(0, MSG_ORIG(MSG_NOTE_NAME)); /* * The name string can contain embedded 'null' * bytes and/or unprintable characters. Also, * the final NULL is documented in the ELF ABI * as being included in the namesz. So, display * the name using C literal string notation, and * include the terminating NULL in the output. * We don't show surrounding double quotes, as * that implies the termination that we are showing * explicitly. */ (void) fwrite(MSG_ORIG(MSG_STR_8SP), MSG_STR_8SP_SIZE, 1, stdout); conv_str_to_c_literal(name, namesz, c_literal_cb, NULL); name = name + ((namesz + (sizeof (Word) - 1)) & ~(sizeof (Word) - 1)); /* LINTED */ data = (Word *)name; dbg_print(0, MSG_ORIG(MSG_STR_EMPTY)); } /* * If multiple information blocks exist within a .note section * account for any padding that must exist before the next * information block. */ if ((pad = (descsz & (sizeof (Word) - 1))) != 0) { pad = sizeof (Word) - pad; if (size > pad) size -= pad; } if (descsz) { int hexdump = 1; const char *desc = (const char *)data; /* * If this is a core note, let the corenote() * function handle it. */ if (is_corenote) { /* We only issue the bad arch error once */ static int badnote_done = 0; corenote_ret_t corenote_ret; corenote_ret = corenote(ehdr->e_machine, do_swap, type, desc, descsz); switch (corenote_ret) { case CORENOTE_R_OK: hexdump = 0; break; case CORENOTE_R_BADDATA: (void) fprintf(stderr, MSG_INTL(MSG_NOTE_BADCOREDATA), file); break; case CORENOTE_R_BADARCH: if (badnote_done) break; (void) fprintf(stderr, MSG_INTL(MSG_NOTE_BADCOREARCH), file, conv_ehdr_mach(ehdr->e_machine, 0, &inv_buf)); break; } } /* * The default thing when we don't understand * the note data is to display it as hex bytes. */ if (hexdump) { dbg_print(0, MSG_ORIG(MSG_NOTE_DESC)); dump_hex_bytes(desc, descsz, 8, 4, 4); } desc += descsz + pad; /* LINTED */ data = (Word *)desc; } } } /* * Search for and process .note sections. * * Returns the number of note sections seen. */ static Word note(Cache *cache, Word shnum, Ehdr *ehdr, const char *file) { Word cnt, note_cnt = 0; /* * Otherwise look for any .note sections. */ for (cnt = 1; cnt < shnum; cnt++) { Cache *_cache = &cache[cnt]; Shdr *shdr = _cache->c_shdr; if (shdr->sh_type != SHT_NOTE) continue; note_cnt++; if (!match(MATCH_F_ALL, _cache->c_name, cnt, shdr->sh_type)) continue; /* * As these sections are often hand rolled, make sure they're * properly aligned before proceeding, and issue an error * as necessary. * * Note that we will continue on to display the note even * if it has bad alignment. We can do this safely, because * libelf knows the alignment required for SHT_NOTE, and * takes steps to deliver a properly aligned buffer to us * even if the actual file is misaligned. */ if (shdr->sh_offset & (sizeof (Word) - 1)) (void) fprintf(stderr, MSG_INTL(MSG_ERR_BADALIGN), file, _cache->c_name); if (_cache->c_data == NULL) continue; dbg_print(0, MSG_ORIG(MSG_STR_EMPTY)); dbg_print(0, MSG_INTL(MSG_ELF_SCN_NOTE), _cache->c_name); note_entry(_cache, (Word *)_cache->c_data->d_buf, /* LINTED */ (Word)_cache->c_data->d_size, ehdr, file); } return (note_cnt); } /* * Determine an individual hash entry. This may be the initial hash entry, * or an associated chain entry. */ static void hash_entry(Cache *refsec, Cache *strsec, const char *hsecname, Word hashndx, Word symndx, Word symn, Sym *syms, const char *file, ulong_t bkts, uint_t flags, int chain) { Sym *sym; const char *symname, *str; char _bucket[MAXNDXSIZE], _symndx[MAXNDXSIZE]; ulong_t nbkt, nhash; if (symndx > symn) { (void) fprintf(stderr, MSG_INTL(MSG_ERR_HSBADSYMNDX), file, EC_WORD(symndx), EC_WORD(hashndx)); symname = MSG_INTL(MSG_STR_UNKNOWN); } else { sym = (Sym *)(syms + symndx); symname = string(refsec, symndx, strsec, file, sym->st_name); } if (chain == 0) { (void) snprintf(_bucket, MAXNDXSIZE, MSG_ORIG(MSG_FMT_INTEGER), hashndx); str = (const char *)_bucket; } else str = MSG_ORIG(MSG_STR_EMPTY); (void) snprintf(_symndx, MAXNDXSIZE, MSG_ORIG(MSG_FMT_INDEX2), EC_WORD(symndx)); dbg_print(0, MSG_ORIG(MSG_FMT_HASH_INFO), str, _symndx, demangle(symname, flags)); /* * Determine if this string is in the correct bucket. */ nhash = elf_hash(symname); nbkt = nhash % bkts; if (nbkt != hashndx) { (void) fprintf(stderr, MSG_INTL(MSG_ERR_BADHASH), file, hsecname, symname, EC_WORD(hashndx), nbkt); } } #define MAXCOUNT 500 static void hash(Cache *cache, Word shnum, const char *file, uint_t flags) { static int count[MAXCOUNT]; Word cnt; ulong_t ndx, bkts; char number[MAXNDXSIZE]; for (cnt = 1; cnt < shnum; cnt++) { uint_t *hash, *chain; Cache *_cache = &cache[cnt]; Shdr *sshdr, *hshdr = _cache->c_shdr; char *ssecname, *hsecname = _cache->c_name; Sym *syms; Word symn; if (hshdr->sh_type != SHT_HASH) continue; /* * Determine the hash table data and size. */ if ((hshdr->sh_entsize == 0) || (hshdr->sh_size == 0)) { (void) fprintf(stderr, MSG_INTL(MSG_ERR_BADSZ), file, hsecname); continue; } if (_cache->c_data == NULL) continue; hash = (uint_t *)_cache->c_data->d_buf; bkts = *hash; chain = hash + 2 + bkts; hash += 2; /* * Get the data buffer for the associated symbol table. */ if ((hshdr->sh_link == 0) || (hshdr->sh_link >= shnum)) { (void) fprintf(stderr, MSG_INTL(MSG_ERR_BADSHLINK), file, hsecname, EC_WORD(hshdr->sh_link)); continue; } _cache = &cache[hshdr->sh_link]; ssecname = _cache->c_name; if (_cache->c_data == NULL) continue; if ((syms = (Sym *)_cache->c_data->d_buf) == NULL) { (void) fprintf(stderr, MSG_INTL(MSG_ERR_BADSZ), file, ssecname); continue; } sshdr = _cache->c_shdr; /* LINTED */ symn = (Word)(sshdr->sh_size / sshdr->sh_entsize); /* * Get the associated string table section. */ if ((sshdr->sh_link == 0) || (sshdr->sh_link >= shnum)) { (void) fprintf(stderr, MSG_INTL(MSG_ERR_BADSHLINK), file, ssecname, EC_WORD(sshdr->sh_link)); continue; } dbg_print(0, MSG_ORIG(MSG_STR_EMPTY)); dbg_print(0, MSG_INTL(MSG_ELF_SCN_HASH), hsecname); dbg_print(0, MSG_INTL(MSG_ELF_HASH_INFO)); /* * Loop through the hash buckets, printing the appropriate * symbols. */ for (ndx = 0; ndx < bkts; ndx++, hash++) { Word _ndx, _cnt; if (*hash == 0) { count[0]++; continue; } hash_entry(_cache, &cache[sshdr->sh_link], hsecname, ndx, *hash, symn, syms, file, bkts, flags, 0); /* * Determine if any other symbols are chained to this * bucket. */ _ndx = chain[*hash]; _cnt = 1; while (_ndx) { hash_entry(_cache, &cache[sshdr->sh_link], hsecname, ndx, _ndx, symn, syms, file, bkts, flags, 1); _ndx = chain[_ndx]; _cnt++; } if (_cnt >= MAXCOUNT) { (void) fprintf(stderr, MSG_INTL(MSG_HASH_OVERFLW), file, _cache->c_name, EC_WORD(ndx), EC_WORD(_cnt)); } else count[_cnt]++; } break; } /* * Print out the count information. */ bkts = cnt = 0; dbg_print(0, MSG_ORIG(MSG_STR_EMPTY)); for (ndx = 0; ndx < MAXCOUNT; ndx++) { Word _cnt; if ((_cnt = count[ndx]) == 0) continue; (void) snprintf(number, MAXNDXSIZE, MSG_ORIG(MSG_FMT_INTEGER), _cnt); dbg_print(0, MSG_INTL(MSG_ELF_HASH_BKTS1), number, EC_WORD(ndx)); bkts += _cnt; cnt += (Word)(ndx * _cnt); } if (cnt) { (void) snprintf(number, MAXNDXSIZE, MSG_ORIG(MSG_FMT_INTEGER), bkts); dbg_print(0, MSG_INTL(MSG_ELF_HASH_BKTS2), number, EC_WORD(cnt)); } } static void group(Cache *cache, Word shnum, const char *file, uint_t flags) { Word scnt; for (scnt = 1; scnt < shnum; scnt++) { Cache *_cache = &cache[scnt]; Shdr *shdr = _cache->c_shdr; Word *grpdata, gcnt, grpcnt, symnum, unknown; Cache *symsec, *strsec; Sym *syms, *sym; char flgstrbuf[MSG_GRP_COMDAT_SIZE + 10]; if (shdr->sh_type != SHT_GROUP) continue; if (!match(MATCH_F_ALL, _cache->c_name, scnt, shdr->sh_type)) continue; if ((_cache->c_data == NULL) || ((grpdata = (Word *)_cache->c_data->d_buf) == NULL)) continue; grpcnt = shdr->sh_size / sizeof (Word); /* * Get the data buffer for the associated symbol table and * string table. */ if (stringtbl(cache, 1, scnt, shnum, file, &symnum, &symsec, &strsec) == 0) return; syms = symsec->c_data->d_buf; dbg_print(0, MSG_ORIG(MSG_STR_EMPTY)); dbg_print(0, MSG_INTL(MSG_ELF_SCN_GRP), _cache->c_name); dbg_print(0, MSG_INTL(MSG_GRP_TITLE)); /* * The first element of the group defines the group. The * associated symbol is defined by the sh_link field. */ if ((shdr->sh_info == SHN_UNDEF) || (shdr->sh_info > symnum)) { (void) fprintf(stderr, MSG_INTL(MSG_ERR_BADSHINFO), file, _cache->c_name, EC_WORD(shdr->sh_info)); return; } (void) strcpy(flgstrbuf, MSG_ORIG(MSG_STR_OSQBRKT)); if (grpdata[0] & GRP_COMDAT) { (void) strcat(flgstrbuf, MSG_ORIG(MSG_GRP_COMDAT)); } if ((unknown = (grpdata[0] & ~GRP_COMDAT)) != 0) { size_t len = strlen(flgstrbuf); (void) snprintf(&flgstrbuf[len], (MSG_GRP_COMDAT_SIZE + 10 - len), MSG_ORIG(MSG_GRP_UNKNOWN), unknown); } (void) strcat(flgstrbuf, MSG_ORIG(MSG_STR_CSQBRKT)); sym = (Sym *)(syms + shdr->sh_info); dbg_print(0, MSG_INTL(MSG_GRP_SIGNATURE), flgstrbuf, demangle(string(_cache, 0, strsec, file, sym->st_name), flags)); for (gcnt = 1; gcnt < grpcnt; gcnt++) { char index[MAXNDXSIZE]; const char *name; (void) snprintf(index, MAXNDXSIZE, MSG_ORIG(MSG_FMT_INDEX), EC_XWORD(gcnt)); if (grpdata[gcnt] >= shnum) name = MSG_INTL(MSG_GRP_INVALSCN); else name = cache[grpdata[gcnt]].c_name; (void) printf(MSG_ORIG(MSG_GRP_ENTRY), index, name, EC_XWORD(grpdata[gcnt])); } } } static void got(Cache *cache, Word shnum, Ehdr *ehdr, const char *file) { Cache *gotcache = NULL, *symtab = NULL; Addr gotbgn, gotend; Shdr *gotshdr; Word cnt, gotents, gotndx; size_t gentsize; Got_info *gottable; char *gotdata; Sym *gotsym; Xword gotsymaddr; uint_t sys_encoding; /* * First, find the got. */ for (cnt = 1; cnt < shnum; cnt++) { if (strncmp(cache[cnt].c_name, MSG_ORIG(MSG_ELF_GOT), MSG_ELF_GOT_SIZE) == 0) { gotcache = &cache[cnt]; break; } } if (gotcache == NULL) return; /* * A got section within a relocatable object is suspicious. */ if (ehdr->e_type == ET_REL) { (void) fprintf(stderr, MSG_INTL(MSG_GOT_UNEXPECTED), file, gotcache->c_name); } gotshdr = gotcache->c_shdr; if (gotshdr->sh_size == 0) { (void) fprintf(stderr, MSG_INTL(MSG_ERR_BADSZ), file, gotcache->c_name); return; } gotbgn = gotshdr->sh_addr; gotend = gotbgn + gotshdr->sh_size; /* * Some architectures don't properly set the sh_entsize for the GOT * table. If it's not set, default to a size of a pointer. */ if ((gentsize = gotshdr->sh_entsize) == 0) gentsize = sizeof (Xword); if (gotcache->c_data == NULL) return; /* LINTED */ gotents = (Word)(gotshdr->sh_size / gentsize); gotdata = gotcache->c_data->d_buf; if ((gottable = calloc(gotents, sizeof (Got_info))) == 0) { int err = errno; (void) fprintf(stderr, MSG_INTL(MSG_ERR_MALLOC), file, strerror(err)); return; } /* * Now we scan through all the sections looking for any relocations * that may be against the GOT. Since these may not be isolated to a * .rel[a].got section we check them all. * While scanning sections save the symbol table entry (a symtab * overriding a dynsym) so that we can lookup _GLOBAL_OFFSET_TABLE_. */ for (cnt = 1; cnt < shnum; cnt++) { Word type, symnum; Xword relndx, relnum, relsize; void *rels; Sym *syms; Cache *symsec, *strsec; Cache *_cache = &cache[cnt]; Shdr *shdr; shdr = _cache->c_shdr; type = shdr->sh_type; if ((symtab == 0) && (type == SHT_DYNSYM)) { symtab = _cache; continue; } if (type == SHT_SYMTAB) { symtab = _cache; continue; } if ((type != SHT_RELA) && (type != SHT_REL)) continue; /* * Decide entry size. */ if (((relsize = shdr->sh_entsize) == 0) || (relsize > shdr->sh_size)) { if (type == SHT_RELA) relsize = sizeof (Rela); else relsize = sizeof (Rel); } /* * Determine the number of relocations available. */ if (shdr->sh_size == 0) { (void) fprintf(stderr, MSG_INTL(MSG_ERR_BADSZ), file, _cache->c_name); continue; } if (_cache->c_data == NULL) continue; rels = _cache->c_data->d_buf; relnum = shdr->sh_size / relsize; /* * Get the data buffer for the associated symbol table and * string table. */ if (stringtbl(cache, 1, cnt, shnum, file, &symnum, &symsec, &strsec) == 0) continue; syms = symsec->c_data->d_buf; /* * Loop through the relocation entries. */ for (relndx = 0; relndx < relnum; relndx++, rels = (void *)((char *)rels + relsize)) { char section[BUFSIZ]; Addr offset; Got_info *gip; Word symndx, reltype; Rela *rela; Rel *rel; /* * Unravel the relocation. */ if (type == SHT_RELA) { rela = (Rela *)rels; symndx = ELF_R_SYM(rela->r_info); reltype = ELF_R_TYPE(rela->r_info, ehdr->e_machine); offset = rela->r_offset; } else { rel = (Rel *)rels; symndx = ELF_R_SYM(rel->r_info); reltype = ELF_R_TYPE(rel->r_info, ehdr->e_machine); offset = rel->r_offset; } /* * Only pay attention to relocations against the GOT. */ if ((offset < gotbgn) || (offset >= gotend)) continue; /* LINTED */ gotndx = (Word)((offset - gotbgn) / gotshdr->sh_entsize); gip = &gottable[gotndx]; if (gip->g_reltype != 0) { (void) fprintf(stderr, MSG_INTL(MSG_GOT_MULTIPLE), file, EC_WORD(gotndx), EC_ADDR(offset)); continue; } if (symndx) gip->g_symname = relsymname(cache, _cache, strsec, symndx, symnum, relndx, syms, section, BUFSIZ, file); gip->g_reltype = reltype; gip->g_rel = rels; } } if (symlookup(MSG_ORIG(MSG_SYM_GOT), cache, shnum, &gotsym, symtab, file)) gotsymaddr = gotsym->st_value; else gotsymaddr = gotbgn; dbg_print(0, MSG_ORIG(MSG_STR_EMPTY)); dbg_print(0, MSG_INTL(MSG_ELF_SCN_GOT), gotcache->c_name); Elf_got_title(0); sys_encoding = _elf_sys_encoding(); for (gotndx = 0; gotndx < gotents; gotndx++) { Got_info *gip; Sword gindex; Addr gaddr; Xword gotentry; gip = &gottable[gotndx]; gaddr = gotbgn + (gotndx * gentsize); gindex = (Sword)(gaddr - gotsymaddr) / (Sword)gentsize; if (gentsize == sizeof (Word)) /* LINTED */ gotentry = (Xword)(*((Word *)(gotdata) + gotndx)); else /* LINTED */ gotentry = *((Xword *)(gotdata) + gotndx); Elf_got_entry(0, gindex, gaddr, gotentry, ehdr->e_machine, ehdr->e_ident[EI_DATA], sys_encoding, gip->g_reltype, gip->g_rel, gip->g_symname); } free(gottable); } void checksum(Elf *elf) { dbg_print(0, MSG_ORIG(MSG_STR_EMPTY)); dbg_print(0, MSG_INTL(MSG_STR_CHECKSUM), elf_checksum(elf)); } /* * This variable is used by regular() to communicate the address of * the section header cache to sort_shdr_ndx_arr(). Unfortunately, * the qsort() interface does not include a userdata argument by which * such arbitrary data can be passed, so we are stuck using global data. */ static Cache *sort_shdr_ndx_arr_cache; /* * Used with qsort() to sort the section indices so that they can be * used to access the section headers in order of increasing data offset. * * entry: * sort_shdr_ndx_arr_cache - Contains address of * section header cache. * v1, v2 - Point at elements of sort_shdr_bits array to be compared. * * exit: * Returns -1 (less than), 0 (equal) or 1 (greater than). */ static int sort_shdr_ndx_arr(const void *v1, const void *v2) { Cache *cache1 = sort_shdr_ndx_arr_cache + *((size_t *)v1); Cache *cache2 = sort_shdr_ndx_arr_cache + *((size_t *)v2); if (cache1->c_shdr->sh_offset < cache2->c_shdr->sh_offset) return (-1); if (cache1->c_shdr->sh_offset > cache2->c_shdr->sh_offset) return (1); return (0); } static int shdr_cache(const char *file, Elf *elf, Ehdr *ehdr, size_t shstrndx, size_t shnum, Cache **cache_ret, Word flags) { Elf_Scn *scn; Elf_Data *data; size_t ndx; Shdr *nameshdr; char *names = NULL; Cache *cache, *_cache; size_t *shdr_ndx_arr, shdr_ndx_arr_cnt; /* * Obtain the .shstrtab data buffer to provide the required section * name strings. */ if (shstrndx == SHN_UNDEF) { /* * It is rare, but legal, for an object to lack a * header string table section. */ names = NULL; (void) fprintf(stderr, MSG_INTL(MSG_ERR_NOSHSTRSEC), file); } else if ((scn = elf_getscn(elf, shstrndx)) == NULL) { failure(file, MSG_ORIG(MSG_ELF_GETSCN)); (void) fprintf(stderr, MSG_INTL(MSG_ELF_ERR_SHDR), EC_XWORD(shstrndx)); } else if ((data = elf_getdata(scn, NULL)) == NULL) { failure(file, MSG_ORIG(MSG_ELF_GETDATA)); (void) fprintf(stderr, MSG_INTL(MSG_ELF_ERR_DATA), EC_XWORD(shstrndx)); } else if ((nameshdr = elf_getshdr(scn)) == NULL) { failure(file, MSG_ORIG(MSG_ELF_GETSHDR)); (void) fprintf(stderr, MSG_INTL(MSG_ELF_ERR_SCN), EC_WORD(elf_ndxscn(scn))); } else if ((names = data->d_buf) == NULL) (void) fprintf(stderr, MSG_INTL(MSG_ERR_SHSTRNULL), file); /* * Allocate a cache to maintain a descriptor for each section. */ if ((*cache_ret = cache = malloc(shnum * sizeof (Cache))) == NULL) { int err = errno; (void) fprintf(stderr, MSG_INTL(MSG_ERR_MALLOC), file, strerror(err)); return (0); } *cache = cache_init; _cache = cache; _cache++; /* * Allocate an array that will hold the section index for * each section that has data in the ELF file: * * - Is not a NOBITS section * - Data has non-zero length * * Note that shnum is an upper bound on the size required. It * is likely that we won't use a few of these array elements. * Allocating a modest amount of extra memory in this case means * that we can avoid an extra loop to count the number of needed * items, and can fill this array immediately in the first loop * below. */ if ((shdr_ndx_arr = malloc(shnum * sizeof (*shdr_ndx_arr))) == NULL) { int err = errno; (void) fprintf(stderr, MSG_INTL(MSG_ERR_MALLOC), file, strerror(err)); return (0); } shdr_ndx_arr_cnt = 0; /* * Traverse the sections of the file. This gathering of data is * carried out in two passes. First, the section headers are captured * and the section header names are evaluated. A verification pass is * then carried out over the section information. Files have been * known to exhibit overlapping (and hence erroneous) section header * information. * * Finally, the data for each section is obtained. This processing is * carried out after section verification because should any section * header overlap occur, and a file needs translating (ie. xlate'ing * information from a non-native architecture file), then the process * of translation can corrupt the section header information. Of * course, if there is any section overlap, the data related to the * sections is going to be compromised. However, it is the translation * of this data that has caused problems with elfdump()'s ability to * extract the data. */ for (ndx = 1, scn = NULL; scn = elf_nextscn(elf, scn); ndx++, _cache++) { char scnndxnm[100]; _cache->c_ndx = ndx; _cache->c_scn = scn; if ((_cache->c_shdr = elf_getshdr(scn)) == NULL) { failure(file, MSG_ORIG(MSG_ELF_GETSHDR)); (void) fprintf(stderr, MSG_INTL(MSG_ELF_ERR_SCN), EC_WORD(elf_ndxscn(scn))); } /* * If this section has data in the file, include it in * the array of sections to check for address overlap. */ if ((_cache->c_shdr->sh_size != 0) && (_cache->c_shdr->sh_type != SHT_NOBITS)) shdr_ndx_arr[shdr_ndx_arr_cnt++] = ndx; /* * If a shstrtab exists, assign the section name. */ if (names && _cache->c_shdr) { if (_cache->c_shdr->sh_name && /* LINTED */ (nameshdr->sh_size > _cache->c_shdr->sh_name)) { const char *symname; char *secname; secname = names + _cache->c_shdr->sh_name; /* * A SUN naming convention employs a "%" within * a section name to indicate a section/symbol * name. This originated from the compilers * -xF option, that places functions into their * own sections. This convention (which has no * formal standard) has also been followed for * COMDAT sections. To demangle the symbol * name, the name must be separated from the * section name. */ if (((flags & FLG_CTL_DEMANGLE) == 0) || ((symname = strchr(secname, '%')) == NULL)) _cache->c_name = secname; else { size_t secsz = ++symname - secname; size_t strsz; symname = demangle(symname, flags); strsz = secsz + strlen(symname) + 1; if ((_cache->c_name = malloc(strsz)) == NULL) { int err = errno; (void) fprintf(stderr, MSG_INTL(MSG_ERR_MALLOC), file, strerror(err)); return (0); } (void) snprintf(_cache->c_name, strsz, MSG_ORIG(MSG_FMT_SECSYM), EC_WORD(secsz), secname, symname); } continue; } /* * Generate an error if the section name index is zero * or exceeds the shstrtab data. Fall through to * fabricate a section name. */ if ((_cache->c_shdr->sh_name == 0) || /* LINTED */ (nameshdr->sh_size <= _cache->c_shdr->sh_name)) { (void) fprintf(stderr, MSG_INTL(MSG_ERR_BADSHNAME), file, EC_WORD(ndx), EC_XWORD(_cache->c_shdr->sh_name)); } } /* * If there exists no shstrtab data, or a section header has no * name (an invalid index of 0), then compose a name for the * section. */ (void) snprintf(scnndxnm, sizeof (scnndxnm), MSG_INTL(MSG_FMT_SCNNDX), ndx); if ((_cache->c_name = malloc(strlen(scnndxnm) + 1)) == NULL) { int err = errno; (void) fprintf(stderr, MSG_INTL(MSG_ERR_MALLOC), file, strerror(err)); return (0); } (void) strcpy(_cache->c_name, scnndxnm); } /* * Having collected all the sections, validate their address range. * Cases have existed where the section information has been invalid. * This can lead to all sorts of other, hard to diagnose errors, as * each section is processed individually (ie. with elf_getdata()). * Here, we carry out some address comparisons to catch a family of * overlapping memory issues we have observed (likely, there are others * that we have yet to discover). * * Note, should any memory overlap occur, obtaining any additional * data from the file is questionable. However, it might still be * possible to inspect the ELF header, Programs headers, or individual * sections, so rather than bailing on an error condition, continue * processing to see if any data can be salvaged. */ if (shdr_ndx_arr_cnt > 1) { sort_shdr_ndx_arr_cache = cache; qsort(shdr_ndx_arr, shdr_ndx_arr_cnt, sizeof (*shdr_ndx_arr), sort_shdr_ndx_arr); } for (ndx = 0; ndx < shdr_ndx_arr_cnt; ndx++) { Cache *_cache = cache + shdr_ndx_arr[ndx]; Shdr *shdr = _cache->c_shdr; Off bgn1, bgn = shdr->sh_offset; Off end1, end = shdr->sh_offset + shdr->sh_size; size_t ndx1; /* * Check the section against all following ones, reporting * any overlaps. Since we've sorted the sections by offset, * we can stop after the first comparison that fails. There * are no overlaps in a properly formed ELF file, in which * case this algorithm runs in O(n) time. This will degenerate * to O(n^2) for a completely broken file. Such a file is * (1) highly unlikely, and (2) unusable, so it is reasonable * for the analysis to take longer. */ for (ndx1 = ndx + 1; ndx1 < shdr_ndx_arr_cnt; ndx1++) { Cache *_cache1 = cache + shdr_ndx_arr[ndx1]; Shdr *shdr1 = _cache1->c_shdr; bgn1 = shdr1->sh_offset; end1 = shdr1->sh_offset + shdr1->sh_size; if (((bgn1 <= bgn) && (end1 > bgn)) || ((bgn1 < end) && (end1 >= end))) { (void) fprintf(stderr, MSG_INTL(MSG_ERR_SECMEMOVER), file, EC_WORD(elf_ndxscn(_cache->c_scn)), _cache->c_name, EC_OFF(bgn), EC_OFF(end), EC_WORD(elf_ndxscn(_cache1->c_scn)), _cache1->c_name, EC_OFF(bgn1), EC_OFF(end1)); } else { /* No overlap, so can stop */ break; } } /* * In addition to checking for sections overlapping * each other (done above), we should also make sure * the section doesn't overlap the section header array. */ bgn1 = ehdr->e_shoff; end1 = ehdr->e_shoff + (ehdr->e_shentsize * ehdr->e_shnum); if (((bgn1 <= bgn) && (end1 > bgn)) || ((bgn1 < end) && (end1 >= end))) { (void) fprintf(stderr, MSG_INTL(MSG_ERR_SHDRMEMOVER), file, EC_OFF(bgn1), EC_OFF(end1), EC_WORD(elf_ndxscn(_cache->c_scn)), _cache->c_name, EC_OFF(bgn), EC_OFF(end)); } } /* * Obtain the data for each section. */ for (ndx = 1; ndx < shnum; ndx++) { Cache *_cache = &cache[ndx]; Elf_Scn *scn = _cache->c_scn; if ((_cache->c_data = elf_getdata(scn, NULL)) == NULL) { failure(file, MSG_ORIG(MSG_ELF_GETDATA)); (void) fprintf(stderr, MSG_INTL(MSG_ELF_ERR_SCNDATA), EC_WORD(elf_ndxscn(scn))); } /* * If a string table, verify that it has NULL first and * final bytes. */ if ((_cache->c_shdr->sh_type == SHT_STRTAB) && (_cache->c_data->d_buf != NULL) && (_cache->c_data->d_size > 0)) { const char *s = _cache->c_data->d_buf; if ((*s != '\0') || (*(s + _cache->c_data->d_size - 1) != '\0')) (void) fprintf(stderr, MSG_INTL(MSG_ERR_MALSTR), file, _cache->c_name); } } return (1); } int regular(const char *file, int fd, Elf *elf, uint_t flags, const char *wname, int wfd) { Elf_Scn *scn; Ehdr *ehdr; size_t ndx, shstrndx, shnum, phnum; Shdr *shdr; Cache *cache; VERSYM_STATE versym; int ret = 0; int addr_align; if ((ehdr = elf_getehdr(elf)) == NULL) { failure(file, MSG_ORIG(MSG_ELF_GETEHDR)); return (ret); } if (elf_getshnum(elf, &shnum) == 0) { failure(file, MSG_ORIG(MSG_ELF_GETSHNUM)); return (ret); } if (elf_getshstrndx(elf, &shstrndx) == 0) { failure(file, MSG_ORIG(MSG_ELF_GETSHSTRNDX)); return (ret); } if (elf_getphnum(elf, &phnum) == 0) { failure(file, MSG_ORIG(MSG_ELF_GETPHNUM)); return (ret); } /* * If the user requested section headers derived from the * program headers (-P option) and this file doesn't have * any program headers (i.e. ET_REL), then we can't do it. */ if ((phnum == 0) && (flags & FLG_CTL_FAKESHDR)) { (void) fprintf(stderr, MSG_INTL(MSG_ERR_PNEEDSPH), file); return (ret); } if ((scn = elf_getscn(elf, 0)) != NULL) { if ((shdr = elf_getshdr(scn)) == NULL) { failure(file, MSG_ORIG(MSG_ELF_GETSHDR)); (void) fprintf(stderr, MSG_INTL(MSG_ELF_ERR_SCN), 0); return (ret); } } else shdr = NULL; /* * Print the elf header. */ if (flags & FLG_SHOW_EHDR) Elf_ehdr(0, ehdr, shdr); /* * If the section headers or program headers have inadequate * alignment for the class of object, print a warning. libelf * can handle such files, but programs that use them can crash * when they dereference unaligned items. * * Note that the AMD64 ABI, although it is a 64-bit architecture, * allows access to data types smaller than 128-bits to be on * word alignment. */ if (ehdr->e_machine == EM_AMD64) addr_align = sizeof (Word); else addr_align = sizeof (Addr); if (ehdr->e_phoff & (addr_align - 1)) (void) fprintf(stderr, MSG_INTL(MSG_ERR_BADPHDRALIGN), file); if (ehdr->e_shoff & (addr_align - 1)) (void) fprintf(stderr, MSG_INTL(MSG_ERR_BADSHDRALIGN), file); /* * Print the program headers. */ if ((flags & FLG_SHOW_PHDR) && (phnum != 0)) { Phdr *phdr; if ((phdr = elf_getphdr(elf)) == NULL) { failure(file, MSG_ORIG(MSG_ELF_GETPHDR)); return (ret); } for (ndx = 0; ndx < phnum; phdr++, ndx++) { if (!match(MATCH_F_PHDR| MATCH_F_NDX | MATCH_F_TYPE, NULL, ndx, phdr->p_type)) continue; dbg_print(0, MSG_ORIG(MSG_STR_EMPTY)); dbg_print(0, MSG_INTL(MSG_ELF_PHDR), EC_WORD(ndx)); Elf_phdr(0, ehdr->e_machine, phdr); } } /* * If we have flag bits set that explicitly require a show or calc * operation, but none of them require the section headers, then * we are done and can return now. */ if (((flags & (FLG_MASK_SHOW | FLG_MASK_CALC)) != 0) && ((flags & (FLG_MASK_SHOW_SHDR | FLG_MASK_CALC_SHDR)) == 0)) return (ret); /* * If there are no section headers, then resort to synthesizing * section headers from the program headers. This is normally * only done by explicit request, but in this case there's no * reason not to go ahead, since the alternative is simply to quit. */ if ((shnum <= 1) && ((flags & FLG_CTL_FAKESHDR) == 0)) { (void) fprintf(stderr, MSG_INTL(MSG_ERR_NOSHDR), file); flags |= FLG_CTL_FAKESHDR; } /* * Generate a cache of section headers and related information * for use by the rest of elfdump. If requested (or the file * contains no section headers), we generate a fake set of * headers from the information accessible from the program headers. * Otherwise, we use the real section headers contained in the file. */ if (flags & FLG_CTL_FAKESHDR) { if (fake_shdr_cache(file, fd, elf, ehdr, &cache, &shnum) == 0) return (ret); } else { if (shdr_cache(file, elf, ehdr, shstrndx, shnum, &cache, flags) == 0) return (ret); } /* * Everything from this point on requires section headers. * If we have no section headers, there is no reason to continue. */ if (shnum <= 1) goto done; /* * If -w was specified, find and write out the section(s) data. */ if (wfd) { for (ndx = 1; ndx < shnum; ndx++) { Cache *_cache = &cache[ndx]; if (match(MATCH_F_STRICT | MATCH_F_ALL, _cache->c_name, ndx, _cache->c_shdr->sh_type) && _cache->c_data && _cache->c_data->d_buf) { if (write(wfd, _cache->c_data->d_buf, _cache->c_data->d_size) != _cache->c_data->d_size) { int err = errno; (void) fprintf(stderr, MSG_INTL(MSG_ERR_WRITE), wname, strerror(err)); /* * Return an exit status of 1, because * the failure is not related to the * ELF file, but by system resources. */ ret = 1; goto done; } } } } /* * If we have no flag bits set that explicitly require a show or calc * operation, but match options (-I, -N, -T) were used, then run * through the section headers and see if we can't deduce show flags * from the match options given. * * We don't do this if -w was specified, because (-I, -N, -T) used * with -w in lieu of some other option is supposed to be quiet. */ if ((wfd == 0) && (flags & FLG_CTL_MATCH) && ((flags & (FLG_MASK_SHOW | FLG_MASK_CALC)) == 0)) { for (ndx = 1; ndx < shnum; ndx++) { Cache *_cache = &cache[ndx]; if (!match(MATCH_F_STRICT | MATCH_F_ALL, _cache->c_name, ndx, _cache->c_shdr->sh_type)) continue; switch (_cache->c_shdr->sh_type) { case SHT_PROGBITS: /* * Heuristic time: It is usually bad form * to assume the meaning/format of a PROGBITS * section based on its name. However, there * are exceptions: The ELF ABI specifies * .interp and .got sections by name. Existing * practice has similarly pinned down the * meaning of unwind sections (.eh_frame and * .eh_frame_hdr). * * Check for these special names. */ if (strcmp(_cache->c_name, MSG_ORIG(MSG_ELF_INTERP)) == 0) flags |= FLG_SHOW_INTERP; else if (strcmp(_cache->c_name, MSG_ORIG(MSG_ELF_GOT)) == 0) flags |= FLG_SHOW_GOT; else if (strncmp(_cache->c_name, MSG_ORIG(MSG_SCN_FRM), MSG_SCN_FRM_SIZE) == 0) flags |= FLG_SHOW_UNWIND; break; case SHT_SYMTAB: case SHT_DYNSYM: case SHT_SUNW_LDYNSYM: case SHT_SUNW_versym: case SHT_SYMTAB_SHNDX: flags |= FLG_SHOW_SYMBOLS; break; case SHT_RELA: case SHT_REL: flags |= FLG_SHOW_RELOC; break; case SHT_HASH: flags |= FLG_SHOW_HASH; break; case SHT_DYNAMIC: flags |= FLG_SHOW_DYNAMIC; break; case SHT_NOTE: flags |= FLG_SHOW_NOTE; break; case SHT_GROUP: flags |= FLG_SHOW_GROUP; break; case SHT_SUNW_symsort: case SHT_SUNW_tlssort: flags |= FLG_SHOW_SORT; break; case SHT_SUNW_cap: flags |= FLG_SHOW_CAP; break; case SHT_SUNW_move: flags |= FLG_SHOW_MOVE; break; case SHT_SUNW_syminfo: flags |= FLG_SHOW_SYMINFO; break; case SHT_SUNW_verdef: case SHT_SUNW_verneed: flags |= FLG_SHOW_VERSIONS; break; case SHT_AMD64_UNWIND: flags |= FLG_SHOW_UNWIND; break; } } } if (flags & FLG_SHOW_SHDR) sections(file, cache, shnum, ehdr); if (flags & FLG_SHOW_INTERP) interp(file, cache, shnum, phnum, elf); versions(cache, shnum, file, flags, &versym); if (flags & FLG_SHOW_SYMBOLS) symbols(cache, shnum, ehdr, &versym, file, flags); if (flags & FLG_SHOW_SORT) sunw_sort(cache, shnum, ehdr, &versym, file, flags); if (flags & FLG_SHOW_HASH) hash(cache, shnum, file, flags); if (flags & FLG_SHOW_GOT) got(cache, shnum, ehdr, file); if (flags & FLG_SHOW_GROUP) group(cache, shnum, file, flags); if (flags & FLG_SHOW_SYMINFO) syminfo(cache, shnum, file); if (flags & FLG_SHOW_RELOC) reloc(cache, shnum, ehdr, file); if (flags & FLG_SHOW_DYNAMIC) dynamic(cache, shnum, ehdr, file); if (flags & FLG_SHOW_NOTE) { Word note_cnt; size_t note_shnum; Cache *note_cache; note_cnt = note(cache, shnum, ehdr, file); /* * Solaris core files have section headers, but these * headers do not include SHT_NOTE sections that reference * the core note sections. This means that note() won't * find the core notes. Fake section headers (-P option) * recover these sections, but it is inconvenient to require * users to specify -P in this situation. If the following * are all true: * * - No note sections were found * - This is a core file * - We are not already using fake section headers * * then we will automatically generate fake section headers * and then process them in a second call to note(). */ if ((note_cnt == 0) && (ehdr->e_type == ET_CORE) && !(flags & FLG_CTL_FAKESHDR) && (fake_shdr_cache(file, fd, elf, ehdr, ¬e_cache, ¬e_shnum) != 0)) { (void) note(note_cache, note_shnum, ehdr, file); fake_shdr_cache_free(note_cache, note_shnum); } } if (flags & FLG_SHOW_MOVE) move(cache, shnum, file, flags); if (flags & FLG_CALC_CHECKSUM) checksum(elf); if (flags & FLG_SHOW_CAP) cap(file, cache, shnum, phnum, ehdr, elf); if (flags & FLG_SHOW_UNWIND) unwind(cache, shnum, phnum, ehdr, file, elf); /* Release the memory used to cache section headers */ done: if (flags & FLG_CTL_FAKESHDR) fake_shdr_cache_free(cache, shnum); else free(cache); return (ret); }