/* * 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 (c) 1988 AT&T * All Rights Reserved * * Copyright 2006 Sun Microsystems, Inc. All rights reserved. * Use is subject to license terms. */ #pragma ident "%Z%%M% %I% %E% SMI" /* * Processing of relocatable objects and shared objects. */ #include #include #include #include #include #include #include #include #include #include #include <_libld.h> /* * Decide if we can link against this input file. */ static int ifl_verify(Ehdr * ehdr, Ofl_desc * ofl, Rej_desc * rej) { /* * Check the validity of the elf header information for compatibility * with this machine and our own internal elf library. */ if ((ehdr->e_machine != M_MACH) && ((ehdr->e_machine != M_MACHPLUS) && ((ehdr->e_flags & M_FLAGSPLUS) == 0))) { rej->rej_type = SGS_REJ_MACH; rej->rej_info = (uint_t)ehdr->e_machine; return (0); } if (ehdr->e_ident[EI_DATA] != M_DATA) { rej->rej_type = SGS_REJ_DATA; rej->rej_info = (uint_t)ehdr->e_ident[EI_DATA]; return (0); } if (ehdr->e_version > ofl->ofl_dehdr->e_version) { rej->rej_type = SGS_REJ_VERSION; rej->rej_info = (uint_t)ehdr->e_version; return (0); } return (1); } /* * Check sanity of file header and allocate an infile descriptor * for the file being processed. */ static Ifl_desc * ifl_setup(const char *name, Ehdr *ehdr, Elf *elf, Half flags, Ofl_desc *ofl, Rej_desc *rej) { Ifl_desc *ifl; List *list; Rej_desc _rej = { 0 }; if (ifl_verify(ehdr, ofl, &_rej) == 0) { _rej.rej_name = name; DBG_CALL(Dbg_file_rejected(ofl->ofl_lml, &_rej)); if (rej->rej_type == 0) { *rej = _rej; rej->rej_name = strdup(_rej.rej_name); } return (0); } if ((ifl = libld_calloc(1, sizeof (Ifl_desc))) == 0) return ((Ifl_desc *)S_ERROR); ifl->ifl_name = name; ifl->ifl_ehdr = ehdr; ifl->ifl_elf = elf; ifl->ifl_flags = flags; /* * Is this file using 'extended Section Indexes'. If so, use the * e_shnum & e_shstrndx which can be found at: * * e_shnum == Shdr[0].sh_size * e_shstrndx == Shdr[0].sh_link */ if ((ehdr->e_shnum == 0) && (ehdr->e_shoff != 0)) { Elf_Scn *scn; Shdr *shdr0; if ((scn = elf_getscn(elf, 0)) == NULL) { eprintf(ofl->ofl_lml, ERR_ELF, MSG_INTL(MSG_ELF_GETSCN), name); ofl->ofl_flags |= FLG_OF_FATAL; return ((Ifl_desc *)S_ERROR); } if ((shdr0 = elf_getshdr(scn)) == NULL) { eprintf(ofl->ofl_lml, ERR_ELF, MSG_INTL(MSG_ELF_GETSHDR), name); ofl->ofl_flags |= FLG_OF_FATAL; return ((Ifl_desc *)S_ERROR); } ifl->ifl_shnum = (Word)shdr0->sh_size; if (ehdr->e_shstrndx == SHN_XINDEX) ifl->ifl_shstrndx = shdr0->sh_link; else ifl->ifl_shstrndx = ehdr->e_shstrndx; } else { ifl->ifl_shnum = ehdr->e_shnum; ifl->ifl_shstrndx = ehdr->e_shstrndx; } if ((ifl->ifl_isdesc = libld_calloc(ifl->ifl_shnum, sizeof (Is_desc *))) == 0) return ((Ifl_desc *)S_ERROR); /* * Record this new input file on the shared object or relocatable * object input file list. */ if (ifl->ifl_ehdr->e_type == ET_DYN) { list = &ofl->ofl_sos; } else { list = &ofl->ofl_objs; } if (list_appendc(list, ifl) == 0) return ((Ifl_desc *)S_ERROR); return (ifl); } /* * Process a generic section. The appropriate section information is added * to the files input descriptor list. */ static uintptr_t process_section(const char *name, Ifl_desc *ifl, Shdr *shdr, Elf_Scn *scn, Word ndx, int ident, Ofl_desc *ofl) { Is_desc *isp; /* * Create a new input section descriptor. If this is a NOBITS * section elf_getdata() will still create a data buffer (the buffer * will be null and the size will reflect the actual memory size). */ if ((isp = libld_calloc(sizeof (Is_desc), 1)) == 0) return (S_ERROR); isp->is_shdr = shdr; isp->is_file = ifl; isp->is_name = name; isp->is_scnndx = ndx; isp->is_flags = FLG_IS_EXTERNAL; /* LINTED */ isp->is_key = (Half)ident; if ((isp->is_indata = elf_getdata(scn, NULL)) == NULL) { eprintf(ofl->ofl_lml, ERR_ELF, MSG_INTL(MSG_ELF_GETDATA), ifl->ifl_name); ofl->ofl_flags |= FLG_OF_FATAL; return (0); } if ((shdr->sh_flags & SHF_EXCLUDE) && ((ofl->ofl_flags & FLG_OF_RELOBJ) == 0)) { isp->is_flags |= FLG_IS_DISCARD; } /* * Add the new input section to the files input section list and * to the output section list (some sections like .strtab and * .shstrtab are not added to the output section list). * * If the section has the SHF_ORDERED flag on, do the ld_place_section() * after all input sections from this file are read in. */ ifl->ifl_isdesc[ndx] = isp; if (ident && (shdr->sh_flags & ALL_SHF_ORDER) == 0) return ((uintptr_t)ld_place_section(ofl, isp, ident, 0)); if (ident && (shdr->sh_flags & ALL_SHF_ORDER)) { isp->is_flags |= FLG_IS_ORDERED; isp->is_ident = ident; if ((ndx != 0) && (ndx == shdr->sh_link) && (shdr->sh_flags & SHF_ORDERED)) { return ((uintptr_t)ld_place_section(ofl, isp, ident, 0)); } } return (1); } /* * Determine the software capabilities of the object being built from the * capabilities of the input relocatable objects. One software capability * is presently recognized, and represented with the following (sys/elf.h): * * SF1_SUNW_FPKNWN use/non-use of frame pointer is known, and * SF1_SUNW_FPUSED the frame pointer is in use. * * The resolution of the present fame pointer state, and the capabilities * provided by a new input relocatable object are: * * new input relocatable object * * present | SF1_SUNW_FPKNWN | SF1_SUNW_FPKNWN | * state | SF1_SUNW_FPUSED | | * --------------------------------------------------------------------------- * SF1_SUNW_FPKNWN | SF1_SUNW_FPKNWN | SF1_SUNW_FPKNWN | SF1_SUNW_FPKNWN * SF1_SUNW_FPUSED | SF1_SUNW_FPUSED | | SF1_SUNW_FPUSED * --------------------------------------------------------------------------- * SF1_SUNW_FPKNWN | SF1_SUNW_FPKNWN | SF1_SUNW_FPKNWN | SF1_SUNW_FPKNWN * | | | * --------------------------------------------------------------------------- * | SF1_SUNW_FPKNWN | SF1_SUNW_FPKNWN | * | SF1_SUNW_FPUSED | | */ static void sf1_cap(Ofl_desc *ofl, Xword val, Ifl_desc *ifl, const char *name) { Xword badval; /* * If a mapfile has established definitions to override any input * capabilities, ignore any new input capabilities. */ if (ofl->ofl_flags1 & FLG_OF1_OVSFCAP) { Dbg_cap_sec_entry(ofl->ofl_lml, DBG_CAP_IGNORE, CA_SUNW_SF_1, val, M_MACH); return; } /* * If this object doesn't specify any capabilities, ignore it, and * leave the state as is. */ if (val == 0) return; /* * Make sure we only accept known software capabilities. Note, that * an F1_SUNW_FPUSED by itself is viewed as bad practice. */ if ((badval = (val & ~SF1_SUNW_MASK)) != 0) { eprintf(ofl->ofl_lml, ERR_WARNING, MSG_INTL(MSG_FIL_BADSF1), ifl->ifl_name, name, EC_XWORD(badval)); val &= SF1_SUNW_MASK; } if (val == SF1_SUNW_FPUSED) { eprintf(ofl->ofl_lml, ERR_WARNING, MSG_INTL(MSG_FIL_BADSF1), ifl->ifl_name, name, EC_XWORD(val)); return; } Dbg_cap_sec_entry(ofl->ofl_lml, DBG_CAP_OLD, CA_SUNW_SF_1, ofl->ofl_sfcap_1, M_MACH); Dbg_cap_sec_entry(ofl->ofl_lml, DBG_CAP_NEW, CA_SUNW_SF_1, val, M_MACH); /* * Determine the resolution of the present frame pointer and the * new input relocatable objects frame pointer. */ if ((ofl->ofl_sfcap_1 & (SF1_SUNW_FPKNWN | SF1_SUNW_FPUSED)) == (SF1_SUNW_FPKNWN | SF1_SUNW_FPUSED)) { /* * If the new relocatable object isn't using a frame pointer, * reduce the present state to unused. */ if ((val & (SF1_SUNW_FPKNWN | SF1_SUNW_FPUSED)) != (SF1_SUNW_FPKNWN | SF1_SUNW_FPUSED)) ofl->ofl_sfcap_1 &= ~SF1_SUNW_FPUSED; } else if ((ofl->ofl_sfcap_1 & SF1_SUNW_FPKNWN) == 0) { /* * If the present state is unknown, take the new relocatable * object frame pointer usage. */ ofl->ofl_sfcap_1 = val; } Dbg_cap_sec_entry(ofl->ofl_lml, DBG_CAP_RESOLVED, CA_SUNW_SF_1, ofl->ofl_sfcap_1, M_MACH); } /* * Determine the hardware capabilities of the object being built from the * capabilities of the input relocatable objects. There's really little to * do here, other than to offer diagnostics, hardware capabilities are simply * additive. */ static void hw1_cap(Ofl_desc *ofl, Xword val) { /* * If a mapfile has established definitions to override any input * capabilities, ignore any new input capabilities. */ if (ofl->ofl_flags1 & FLG_OF1_OVHWCAP) { Dbg_cap_sec_entry(ofl->ofl_lml, DBG_CAP_IGNORE, CA_SUNW_HW_1, val, M_MACH); return; } /* * If this object doesn't specify any capabilities, ignore it, and * leave the state as is. */ if (val == 0) return; Dbg_cap_sec_entry(ofl->ofl_lml, DBG_CAP_OLD, CA_SUNW_HW_1, ofl->ofl_hwcap_1, M_MACH); Dbg_cap_sec_entry(ofl->ofl_lml, DBG_CAP_NEW, CA_SUNW_HW_1, val, M_MACH); ofl->ofl_hwcap_1 |= val; Dbg_cap_sec_entry(ofl->ofl_lml, DBG_CAP_RESOLVED, CA_SUNW_HW_1, ofl->ofl_hwcap_1, M_MACH); } /* * Process a hardware/software capabilities section. Traverse the section * updating the global capabilities variables as necessary. */ static void process_cap(const char *name, Ifl_desc *ifl, Is_desc *cisp, Ofl_desc *ofl) { Cap *cdata; DBG_CALL(Dbg_cap_sec_title(ofl)); for (cdata = (Cap *)cisp->is_indata->d_buf; cdata->c_tag != CA_SUNW_NULL; cdata++) { switch (cdata->c_tag) { case CA_SUNW_HW_1: hw1_cap(ofl, cdata->c_un.c_val); break; case CA_SUNW_SF_1: sf1_cap(ofl, cdata->c_un.c_val, ifl, name); break; default: eprintf(ofl->ofl_lml, ERR_WARNING, MSG_INTL(MSG_FIL_UNKCAP), ifl->ifl_name, name, cdata->c_tag); } } } /* * Simply process the section so that we have pointers to the data for use * in later routines, however don't add the section to the output section * list as we will be creating our own replacement sections later (ie. * symtab and relocation). */ static uintptr_t /* ARGSUSED5 */ process_input(const char *name, Ifl_desc *ifl, Shdr *shdr, Elf_Scn *scn, Word ndx, int ident, Ofl_desc *ofl) { return (process_section(name, ifl, shdr, scn, ndx, M_ID_NULL, ofl)); } /* * Keep a running count of relocation entries from input relocatable objects for * sizing relocation buckets later. If we're building an executable, save any * relocations from shared objects to determine if any copy relocation symbol * has a displacement relocation against it. */ static uintptr_t /* ARGSUSED5 */ process_reloc(const char *name, Ifl_desc *ifl, Shdr *shdr, Elf_Scn *scn, Word ndx, int ident, Ofl_desc *ofl) { if (process_section(name, ifl, shdr, scn, ndx, M_ID_NULL, ofl) == S_ERROR) return (S_ERROR); if (ifl->ifl_ehdr->e_type == ET_REL) { if (shdr->sh_entsize && (shdr->sh_entsize <= shdr->sh_size)) /* LINTED */ ofl->ofl_relocincnt += (Word)(shdr->sh_size / shdr->sh_entsize); } else if (ofl->ofl_flags & FLG_OF_EXEC) { if (list_appendc(&ifl->ifl_relsect, ifl->ifl_isdesc[ndx]) == 0) return (S_ERROR); } return (1); } /* * Process a string table section. A valid section contains an initial and * final null byte. */ static uintptr_t process_strtab(const char *name, Ifl_desc *ifl, Shdr *shdr, Elf_Scn *scn, Word ndx, int ident, Ofl_desc *ofl) { char *data; size_t size; Is_desc *isp; uintptr_t error; /* * Never include .stab.excl sections in any output file. * If the -s flag has been specified strip any .stab sections. */ if (((ofl->ofl_flags & FLG_OF_STRIP) && ident && (strncmp(name, MSG_ORIG(MSG_SCN_STAB), MSG_SCN_STAB_SIZE) == 0)) || (strcmp(name, MSG_ORIG(MSG_SCN_STABEXCL)) == 0) && ident) return (1); /* * If we got here to process a .shstrtab or .dynstr table, `ident' will * be null. Otherwise make sure we don't have a .strtab section as this * should not be added to the output section list either. */ if ((ident != M_ID_NULL) && (strcmp(name, MSG_ORIG(MSG_SCN_STRTAB)) == 0)) ident = M_ID_NULL; error = process_section(name, ifl, shdr, scn, ndx, ident, ofl); if ((error == 0) || (error == S_ERROR)) return (error); /* * String tables should start and end with a NULL byte. Note, it has * been known for the assembler to create empty string tables, so check * the size before attempting to verify the data itself. */ isp = ifl->ifl_isdesc[ndx]; size = isp->is_indata->d_size; if (size) { data = isp->is_indata->d_buf; if (data[0] != '\0' || data[size - 1] != '\0') eprintf(ofl->ofl_lml, ERR_WARNING, MSG_INTL(MSG_FIL_MALSTR), ifl->ifl_name, name); } else isp->is_indata->d_buf = (void *)MSG_ORIG(MSG_STR_EMPTY); ifl->ifl_flags |= FLG_IF_HSTRTAB; return (1); } /* * Invalid sections produce a warning and are skipped. */ static uintptr_t /* ARGSUSED3 */ invalid_section(const char *name, Ifl_desc *ifl, Shdr *shdr, Elf_Scn *scn, Word ndx, int ident, Ofl_desc *ofl) { eprintf(ofl->ofl_lml, ERR_WARNING, MSG_INTL(MSG_FIL_INVALSEC), ifl->ifl_name, name, conv_sec_type(ifl->ifl_ehdr->e_machine, shdr->sh_type, 0)); return (1); } /* * Process a progbits section. */ static uintptr_t process_progbits(const char *name, Ifl_desc *ifl, Shdr *shdr, Elf_Scn *scn, Word ndx, int ident, Ofl_desc *ofl) { int stab_index = 0; /* * Never include .stab.excl sections in any output file. * If the -s flag has been specified strip any .stab sections. */ if (ident && (strncmp(name, MSG_ORIG(MSG_SCN_STAB), MSG_SCN_STAB_SIZE) == 0)) { if ((ofl->ofl_flags & FLG_OF_STRIP) || (strcmp((name + MSG_SCN_STAB_SIZE), MSG_ORIG(MSG_SCN_EXCL)) == 0)) return (1); if (strcmp((name + MSG_SCN_STAB_SIZE), MSG_ORIG(MSG_SCN_INDEX)) == 0) stab_index = 1; } if ((ofl->ofl_flags & FLG_OF_STRIP) && ident) { if ((strncmp(name, MSG_ORIG(MSG_SCN_DEBUG), MSG_SCN_DEBUG_SIZE) == 0) || (strcmp(name, MSG_ORIG(MSG_SCN_LINE)) == 0)) return (1); } /* * Update the ident to reflect the type of section we've got. * * If there is any .plt or .got section to generate we'll be creating * our own version, so don't allow any input sections of these types to * be added to the output section list (why a relocatable object would * have a .plt or .got is a mystery, but stranger things have occurred). */ if (ident) { if (shdr->sh_flags & SHF_TLS) ident = M_ID_TLS; else if ((shdr->sh_flags & ~ALL_SHF_IGNORE) == (SHF_ALLOC | SHF_EXECINSTR)) ident = M_ID_TEXT; else if (shdr->sh_flags & SHF_ALLOC) { if ((strcmp(name, MSG_ORIG(MSG_SCN_PLT)) == 0) || (strcmp(name, MSG_ORIG(MSG_SCN_GOT)) == 0)) ident = M_ID_NULL; else if (stab_index) { /* * This is a work-around for x86 compilers that * have set SHF_ALLOC for the .stab.index * section. * * Because of this, make sure that the * .stab.index does not end up as the last * section in the text segment. Older linkers * can produce segmentation violations when they * strip (ld -s) against a shared object whose * last section in the text segment is a .stab. */ ident = M_ID_INTERP; } else ident = M_ID_DATA; } else ident = M_ID_NOTE; } return (process_section(name, ifl, shdr, scn, ndx, ident, ofl)); } /* * Handles the SHT_SUNW_{DEBUG,DEBUGSTR) sections. */ static uintptr_t process_debug(const char *name, Ifl_desc *ifl, Shdr *shdr, Elf_Scn *scn, Word ndx, int ident, Ofl_desc *ofl) { /* * Debug information is discarded when the 'ld -s' flag is invoked. */ if (ofl->ofl_flags & FLG_OF_STRIP) { return (1); } return (process_progbits(name, ifl, shdr, scn, ndx, ident, ofl)); } /* * Process a nobits section. */ static uintptr_t process_nobits(const char *name, Ifl_desc *ifl, Shdr *shdr, Elf_Scn *scn, Word ndx, int ident, Ofl_desc *ofl) { if (ident) { if (shdr->sh_flags & SHF_TLS) ident = M_ID_TLSBSS; #if (defined(__i386) || defined(__amd64)) && defined(_ELF64) else if (shdr->sh_flags & SHF_AMD64_LARGE) ident = M_ID_LBSS; #endif else ident = M_ID_BSS; } return (process_section(name, ifl, shdr, scn, ndx, ident, ofl)); } /* * Process a SHT_*_ARRAY section. */ static uintptr_t process_array(const char *name, Ifl_desc *ifl, Shdr *shdr, Elf_Scn *scn, Word ndx, int ident, Ofl_desc *ofl) { Os_desc *osp; Is_desc *isp; if (ident) ident = M_ID_ARRAY; if (process_section(name, ifl, shdr, scn, ndx, ident, ofl) == S_ERROR) return (S_ERROR); if (((isp = ifl->ifl_isdesc[ndx]) == 0) || ((osp = isp->is_osdesc) == 0)) return (0); if ((shdr->sh_type == SHT_FINI_ARRAY) && (ofl->ofl_osfiniarray == 0)) ofl->ofl_osfiniarray = osp; else if ((shdr->sh_type == SHT_INIT_ARRAY) && (ofl->ofl_osinitarray == 0)) ofl->ofl_osinitarray = osp; else if ((shdr->sh_type == SHT_PREINIT_ARRAY) && (ofl->ofl_ospreinitarray == 0)) ofl->ofl_ospreinitarray = osp; return (1); } /* * Process a SHT_SYMTAB_SHNDX section. */ static uintptr_t process_sym_shndx(const char *name, Ifl_desc *ifl, Shdr *shdr, Elf_Scn *scn, Word ndx, int ident, Ofl_desc *ofl) { if (process_input(name, ifl, shdr, scn, ndx, ident, ofl) == S_ERROR) return (S_ERROR); /* * Have we already seen the related SYMTAB - if so verify it now. */ if (shdr->sh_link < ndx) { Is_desc *isp = ifl->ifl_isdesc[shdr->sh_link]; if ((isp == 0) || ((isp->is_shdr->sh_type != SHT_SYMTAB) && (isp->is_shdr->sh_type != SHT_DYNSYM))) { eprintf(ofl->ofl_lml, ERR_FATAL, MSG_INTL(MSG_FIL_INVSHLINK), ifl->ifl_name, name, EC_XWORD(shdr->sh_link)); return (S_ERROR); } isp->is_symshndx = ifl->ifl_isdesc[ndx]; } return (1); } /* * Final processing for SHT_SYMTAB_SHNDX section. */ static uintptr_t /* ARGSUSED2 */ sym_shndx_process(Is_desc *isc, Ifl_desc *ifl, Ofl_desc *ofl) { if (isc->is_shdr->sh_link > isc->is_scnndx) { Is_desc *isp = ifl->ifl_isdesc[isc->is_shdr->sh_link]; if ((isp == 0) || ((isp->is_shdr->sh_type != SHT_SYMTAB) && (isp->is_shdr->sh_type != SHT_DYNSYM))) { eprintf(ofl->ofl_lml, ERR_FATAL, MSG_INTL(MSG_FIL_INVSHLINK), isc->is_file->ifl_name, isc->is_name, EC_XWORD(isc->is_shdr->sh_link)); return (S_ERROR); } isp->is_symshndx = isc; } return (1); } /* * Process .dynamic section from a relocatable object. * * Note: That the .dynamic section is only considered interesting when * dlopen()ing a relocatable object (thus FLG_OF1_RELDYN can only get * set when libld is called from ld.so.1). */ /*ARGSUSED*/ static uintptr_t process_rel_dynamic(const char *name, Ifl_desc *ifl, Shdr *shdr, Elf_Scn *scn, Word ndx, int ident, Ofl_desc *ofl) { Dyn *dyn; Elf_Scn *strscn; Elf_Data *dp; char *str; /* * Process .dynamic sections from relocatable objects ? */ if ((ofl->ofl_flags1 & FLG_OF1_RELDYN) == 0) return (1); /* * Find the string section associated with the .dynamic section. */ if ((strscn = elf_getscn(ifl->ifl_elf, shdr->sh_link)) == NULL) { eprintf(ofl->ofl_lml, ERR_ELF, MSG_INTL(MSG_ELF_GETSCN), ifl->ifl_name); ofl->ofl_flags |= FLG_OF_FATAL; return (0); } dp = elf_getdata(strscn, NULL); str = (char *)dp->d_buf; /* * And get the .dynamic data */ dp = elf_getdata(scn, NULL); for (dyn = (Dyn *)dp->d_buf; dyn->d_tag != DT_NULL; dyn++) { Ifl_desc *difl; switch (dyn->d_tag) { case DT_NEEDED: case DT_USED: if (((difl = libld_calloc(1, sizeof (Ifl_desc))) == 0) || (list_appendc(&ofl->ofl_sos, difl) == 0)) return (S_ERROR); difl->ifl_name = MSG_ORIG(MSG_STR_DYNAMIC); difl->ifl_soname = str + (size_t)dyn->d_un.d_val; difl->ifl_flags = FLG_IF_NEEDSTR; break; case DT_RPATH: case DT_RUNPATH: if ((ofl->ofl_rpath = add_string(ofl->ofl_rpath, (str + (size_t)dyn->d_un.d_val))) == (const char *)S_ERROR) return (S_ERROR); break; } } return (1); } /* * Expand implicit references. Dependencies can be specified in terms of the * $ORIGIN, $PLATFORM, $OSREL and $OSNAME tokens, either from their needed name, * or via a runpath. In addition runpaths may also specify the $ISALIST token. * * Probably the most common reference to explicit dependencies (via -L) will be * sufficient to find any associated implicit dependencies, but just in case we * expand any occurrence of these known tokens here. * * Note, if any errors occur we simply return the original name. * * This code is remarkably similar to expand() in rtld/common/paths.c. */ static char *platform = 0; static size_t platform_sz = 0; static Isa_desc *isa = 0; static Uts_desc *uts = 0; static char * expand(const char *parent, const char *name, char **next) { char _name[PATH_MAX], *nptr, *_next; const char *optr; size_t nrem = PATH_MAX - 1; int expanded = 0, _expanded, isaflag = 0; optr = name; nptr = _name; while (*optr) { if (nrem == 0) return ((char *)name); if (*optr != '$') { *nptr++ = *optr++, nrem--; continue; } _expanded = 0; if (strncmp(optr, MSG_ORIG(MSG_STR_ORIGIN), MSG_STR_ORIGIN_SIZE) == 0) { char *eptr; /* * For $ORIGIN, expansion is really just a concatenation * of the parents directory name. For example, an * explicit dependency foo/bar/lib1.so with a dependency * on $ORIGIN/lib2.so would be expanded to * foo/bar/lib2.so. */ if ((eptr = strrchr(parent, '/')) == 0) { *nptr++ = '.'; nrem--; } else { size_t len = eptr - parent; if (len >= nrem) return ((char *)name); (void) strncpy(nptr, parent, len); nptr = nptr + len; nrem -= len; } optr += MSG_STR_ORIGIN_SIZE; expanded = _expanded = 1; } else if (strncmp(optr, MSG_ORIG(MSG_STR_PLATFORM), MSG_STR_PLATFORM_SIZE) == 0) { /* * Establish the platform from sysconf - like uname -i. */ if ((platform == 0) && (platform_sz == 0)) { char info[SYS_NMLN]; long size; size = sysinfo(SI_PLATFORM, info, SYS_NMLN); if ((size != -1) && (platform = libld_malloc((size_t)size))) { (void) strcpy(platform, info); platform_sz = (size_t)size - 1; } else platform_sz = 1; } if (platform != 0) { if (platform_sz >= nrem) return ((char *)name); (void) strncpy(nptr, platform, platform_sz); nptr = nptr + platform_sz; nrem -= platform_sz; optr += MSG_STR_PLATFORM_SIZE; expanded = _expanded = 1; } } else if (strncmp(optr, MSG_ORIG(MSG_STR_OSNAME), MSG_STR_OSNAME_SIZE) == 0) { /* * Establish the os name - like uname -s. */ if (uts == 0) uts = conv_uts(); if (uts && uts->uts_osnamesz) { if (uts->uts_osnamesz >= nrem) return ((char *)name); (void) strncpy(nptr, uts->uts_osname, uts->uts_osnamesz); nptr = nptr + uts->uts_osnamesz; nrem -= uts->uts_osnamesz; optr += MSG_STR_OSNAME_SIZE; expanded = _expanded = 1; } } else if (strncmp(optr, MSG_ORIG(MSG_STR_OSREL), MSG_STR_OSREL_SIZE) == 0) { /* * Establish the os release - like uname -r. */ if (uts == 0) uts = conv_uts(); if (uts && uts->uts_osrelsz) { if (uts->uts_osrelsz >= nrem) return ((char *)name); (void) strncpy(nptr, uts->uts_osrel, uts->uts_osrelsz); nptr = nptr + uts->uts_osrelsz; nrem -= uts->uts_osrelsz; optr += MSG_STR_OSREL_SIZE; expanded = _expanded = 1; } } else if ((strncmp(optr, MSG_ORIG(MSG_STR_ISALIST), MSG_STR_ISALIST_SIZE) == 0) && next && (isaflag++ == 0)) { /* * Establish instruction sets from sysconf. Note that * this is only meaningful from runpaths. */ if (isa == 0) isa = conv_isalist(); if (isa && isa->isa_listsz && (nrem > isa->isa_opt->isa_namesz)) { size_t mlen, tlen, hlen = optr - name; size_t no; char *lptr; Isa_opt *opt = isa->isa_opt; (void) strncpy(nptr, opt->isa_name, opt->isa_namesz); nptr = nptr + opt->isa_namesz; nrem -= opt->isa_namesz; optr += MSG_STR_ISALIST_SIZE; expanded = _expanded = 1; tlen = strlen(optr); /* * As ISALIST expands to a number of elements, * establish a new list to return to the caller. * This will contain the present path being * processed redefined for each isalist option, * plus the original remaining list entries. */ mlen = ((hlen + tlen) * (isa->isa_optno - 1)) + isa->isa_listsz - opt->isa_namesz; if (*next) mlen += strlen(*next); if ((_next = lptr = libld_malloc(mlen)) == 0) return (0); for (no = 1, opt++; no < isa->isa_optno; no++, opt++) { (void) strncpy(lptr, name, hlen); lptr = lptr + hlen; (void) strncpy(lptr, opt->isa_name, opt->isa_namesz); lptr = lptr + opt->isa_namesz; (void) strncpy(lptr, optr, tlen); lptr = lptr + tlen; *lptr++ = ':'; } if (*next) (void) strcpy(lptr, *next); else *--lptr = '\0'; } } /* * If no expansion occurred skip the $ and continue. */ if (_expanded == 0) *nptr++ = *optr++, nrem--; } /* * If any ISALIST processing has occurred not only do we return the * expanded node we're presently working on, but we must also update the * remaining list so that it is effectively prepended with this node * expanded to all remaining isalist options. Note that we can only * handle one ISALIST per node. For more than one ISALIST to be * processed we'd need a better algorithm than above to replace the * newly generated list. Whether we want to encourage the number of * pathname permutations this would provide is another question. So, for * now if more than one ISALIST is encountered we return the original * node untouched. */ if (isaflag) { if (isaflag == 1) *next = _next; else return ((char *)name); } *nptr = '\0'; if (expanded) { if ((nptr = libld_malloc(strlen(_name) + 1)) == 0) return ((char *)name); (void) strcpy(nptr, _name); return (nptr); } return ((char *)name); } /* * Process a dynamic section. If we are processing an explicit shared object * then we need to determine if it has a recorded SONAME, if so, this name will * be recorded in the output file being generated as the NEEDED entry rather * than the shared objects filename itself. * If the mode of the link-edit indicates that no undefined symbols should * remain, then we also need to build up a list of any additional shared object * dependencies this object may have. In this case save any NEEDED entries * together with any associated run-path specifications. This information is * recorded on the `ofl_soneed' list and will be analyzed after all explicit * file processing has been completed (refer finish_libs()). */ static uintptr_t process_dynamic(Is_desc *isc, Ifl_desc *ifl, Ofl_desc *ofl) { Dyn *data, *dyn; char *str, *rpath = NULL; const char *soname, *needed; Sdf_desc *sdf; Listnode *lnp; data = (Dyn *)isc->is_indata->d_buf; str = (char *)ifl->ifl_isdesc[isc->is_shdr->sh_link]->is_indata->d_buf; /* * First loop through the dynamic section looking for a run path. */ if (ofl->ofl_flags & (FLG_OF_NOUNDEF | FLG_OF_SYMBOLIC)) { for (dyn = data; dyn->d_tag != DT_NULL; dyn++) { if ((dyn->d_tag != DT_RPATH) && (dyn->d_tag != DT_RUNPATH)) continue; if ((rpath = str + (size_t)dyn->d_un.d_val) == NULL) continue; break; } } /* * Now look for any needed dependencies (which may use the rpath) * or a new SONAME. */ for (dyn = data; dyn->d_tag != DT_NULL; dyn++) { if (dyn->d_tag == DT_SONAME) { if ((soname = str + (size_t)dyn->d_un.d_val) == NULL) continue; /* * Update the input file structure with this new name. */ ifl->ifl_soname = soname; } else if ((dyn->d_tag == DT_NEEDED) || (dyn->d_tag == DT_USED)) { if (!(ofl->ofl_flags & (FLG_OF_NOUNDEF | FLG_OF_SYMBOLIC))) continue; if ((needed = str + (size_t)dyn->d_un.d_val) == NULL) continue; /* * Determine if this needed entry is already recorded on * the shared object needed list, if not create a new * definition for later processing (see finish_libs()). */ needed = expand(ifl->ifl_name, needed, (char **)0); if ((sdf = sdf_find(needed, &ofl->ofl_soneed)) == 0) { if ((sdf = sdf_add(needed, &ofl->ofl_soneed)) == (Sdf_desc *)S_ERROR) return (S_ERROR); sdf->sdf_rfile = ifl->ifl_name; } /* * Record the runpath (Note that we take the first * runpath which is exactly what ld.so.1 would do during * its dependency processing). */ if (rpath && (sdf->sdf_rpath == 0)) sdf->sdf_rpath = rpath; } else if (dyn->d_tag == DT_FLAGS_1) { if (dyn->d_un.d_val & (DF_1_INITFIRST | DF_1_INTERPOSE)) ifl->ifl_flags &= ~FLG_IF_LAZYLD; if (dyn->d_un.d_val & DF_1_DISPRELPND) ifl->ifl_flags |= FLG_IF_DISPPEND; if (dyn->d_un.d_val & DF_1_DISPRELDNE) ifl->ifl_flags |= FLG_IF_DISPDONE; if (dyn->d_un.d_val & DF_1_NODIRECT) ifl->ifl_flags |= FLG_IF_NODIRECT; } else if ((dyn->d_tag == DT_AUDIT) && (ifl->ifl_flags & FLG_IF_NEEDED)) { /* * Record audit string as DT_DEPAUDIT. */ if ((ofl->ofl_depaudit = add_string(ofl->ofl_depaudit, (str + (size_t)dyn->d_un.d_val))) == (const char *)S_ERROR) return (S_ERROR); } else if (dyn->d_tag == DT_SUNW_RTLDINF) { /* * If a library has the SUNW_RTLDINF .dynamic entry * then we must not permit lazyloading of this library. * This is because critical startup information (TLS * routines) are provided as part of these interfaces * and we must have them as part of process startup. */ ifl->ifl_flags &= ~FLG_IF_LAZYLD; } } /* * Perform some SONAME sanity checks. */ if (ifl->ifl_flags & FLG_IF_NEEDED) { Ifl_desc * sifl; /* * Determine if anyone else will cause the same SONAME to be * used (this is either caused by two different files having the * same SONAME, or by one file SONAME actually matching another * file basename (if no SONAME is specified within a shared * library its basename will be used)). Probably rare, but some * idiot will do it. */ for (LIST_TRAVERSE(&ofl->ofl_sos, lnp, sifl)) { if ((strcmp(ifl->ifl_soname, sifl->ifl_soname) == 0) && (ifl != sifl)) { const char *hint, *iflb, *siflb; /* * Determine the basename of each file. Perhaps * there are multiple copies of the same file * being brought in using different -L search * paths, and if so give an extra hint in the * error message. */ iflb = strrchr(ifl->ifl_name, '/'); if (iflb == NULL) iflb = ifl->ifl_name; else iflb++; siflb = strrchr(sifl->ifl_name, '/'); if (siflb == NULL) siflb = sifl->ifl_name; else siflb++; if (strcmp(iflb, siflb) == 0) hint = MSG_INTL(MSG_REC_CNFLTHINT); else hint = MSG_ORIG(MSG_STR_EMPTY); eprintf(ofl->ofl_lml, ERR_FATAL, MSG_INTL(MSG_REC_OBJCNFLT), sifl->ifl_name, ifl->ifl_name, sifl->ifl_soname, hint); ofl->ofl_flags |= FLG_OF_FATAL; return (0); } } /* * If the SONAME is the same as the name the user wishes to * record when building a dynamic library (refer -h option), * we also have a name clash. */ if (ofl->ofl_soname && (strcmp(ofl->ofl_soname, ifl->ifl_soname) == 0)) { eprintf(ofl->ofl_lml, ERR_FATAL, MSG_INTL(MSG_REC_OPTCNFLT), ifl->ifl_name, ifl->ifl_soname); ofl->ofl_flags |= FLG_OF_FATAL; return (0); } } return (1); } /* * Process a relocation entry. At this point all input sections from this * input file have been assigned an input section descriptor which is saved * in the `ifl_isdesc' array. */ static uintptr_t rel_process(Is_desc *isc, Ifl_desc *ifl, Ofl_desc *ofl) { Word rndx; Is_desc *risc; Os_desc *osp; Shdr *shdr = isc->is_shdr; /* * Make sure this is a valid relocation we can handle. */ if (shdr->sh_type != M_REL_SHT_TYPE) { eprintf(ofl->ofl_lml, ERR_FATAL, MSG_INTL(MSG_FIL_INVALSEC), ifl->ifl_name, isc->is_name, conv_sec_type(ifl->ifl_ehdr->e_machine, shdr->sh_type, 0)); ofl->ofl_flags |= FLG_OF_FATAL; return (0); } /* * From the relocation section header information determine which * section needs the actual relocation. Determine which output section * this input section has been assigned to and add to its relocation * list. Note that the relocation section may be null if it is not * required (ie. .debug, .stabs, etc). */ rndx = shdr->sh_info; if (rndx >= ifl->ifl_shnum) { /* * Broken input file. */ eprintf(ofl->ofl_lml, ERR_FATAL, MSG_INTL(MSG_FIL_INVSHINFO), ifl->ifl_name, isc->is_name, EC_XWORD(rndx)); ofl->ofl_flags |= FLG_OF_FATAL; return (0); } if (rndx == 0) { if (list_appendc(&ofl->ofl_extrarels, isc) == 0) return (S_ERROR); } else if ((risc = ifl->ifl_isdesc[rndx]) != 0) { /* * Discard relocations if they are against a section * which has been discarded. */ if (risc->is_flags & FLG_IS_DISCARD) return (1); if ((osp = risc->is_osdesc) == 0) { if (risc->is_shdr->sh_type == SHT_SUNW_move) { /* * This section is processed later * in sunwmove_preprocess() and * reloc_init(). */ if (list_appendc(&ofl->ofl_mvrelisdescs, isc) == 0) return (S_ERROR); return (1); } eprintf(ofl->ofl_lml, ERR_FATAL, MSG_INTL(MSG_FIL_INVRELOC1), ifl->ifl_name, isc->is_name, risc->is_name); return (0); } if (list_appendc(&osp->os_relisdescs, isc) == 0) return (S_ERROR); } return (1); } /* * SHF_EXCLUDE flags is set for this section. */ static uintptr_t process_exclude(const char *name, Ifl_desc *ifl, Shdr *shdr, Elf_Scn *scn, Word ndx, Ofl_desc *ofl) { /* * Sections SHT_SYMTAB and SHT_DYNDYM, even if SHF_EXCLUDE is on, might * be needed for ld processing. These sections need to be in the * internal table. Later it will be determined whether they can be * eliminated or not. */ if (shdr->sh_type == SHT_SYMTAB || shdr->sh_type == SHT_DYNSYM) return (0); /* * Other checks */ if (shdr->sh_flags & SHF_ALLOC) { /* * A conflict, issue an warning message, and ignore the section. */ eprintf(ofl->ofl_lml, ERR_WARNING, MSG_INTL(MSG_FIL_EXCLUDE), ifl->ifl_name, name); return (0); } /* * This sections is not going to the output file. */ return (process_section(name, ifl, shdr, scn, ndx, 0, ofl)); } #if (defined(__i386) || defined(__amd64)) && defined(_ELF64) static uintptr_t process_amd64_unwind(const char *name, Ifl_desc *ifl, Shdr *shdr, Elf_Scn *scn, Word ndx, int ident, Ofl_desc *ofl) { Os_desc *osp, *eosp; Is_desc *isp; Listnode *lnp; if (process_section(name, ifl, shdr, scn, ndx, ident, ofl) == S_ERROR) return (S_ERROR); /* * When producing a relocatable object - just collect the sections. */ if (ofl->ofl_flags & FLG_OF_RELOBJ) return (1); /* * If producing a executable or shared library, keep track of all the * output UNWIND sections to allow the creation of the appropriate * frame_hdr information. * * If the section hasn't been placed in the output file, then there's * nothing for us to do. */ if (((isp = ifl->ifl_isdesc[ndx]) == 0) || ((osp = isp->is_osdesc) == 0)) return (1); /* * Check to see if this output section is already on the list, and if * not, add it. */ for (LIST_TRAVERSE(&ofl->ofl_unwind, lnp, eosp)) if (osp == eosp) return (1); if (list_appendc(&ofl->ofl_unwind, osp) == 0) return (S_ERROR); return (1); } #endif /* * Section processing state table. `Initial' describes the required initial * procedure to be called (if any), `Final' describes the final processing * procedure (ie. things that can only be done when all required sections * have been collected). */ static uintptr_t (*Initial[SHT_NUM][2])() = { /* ET_REL ET_DYN */ /* SHT_NULL */ invalid_section, invalid_section, /* SHT_PROGBITS */ process_progbits, process_progbits, /* SHT_SYMTAB */ process_input, process_input, /* SHT_STRTAB */ process_strtab, process_strtab, /* SHT_RELA */ process_reloc, process_reloc, /* SHT_HASH */ invalid_section, NULL, /* SHT_DYNAMIC */ process_rel_dynamic, process_section, /* SHT_NOTE */ process_section, NULL, /* SHT_NOBITS */ process_nobits, process_nobits, /* SHT_REL */ process_reloc, process_reloc, /* SHT_SHLIB */ process_section, invalid_section, /* SHT_DYNSYM */ invalid_section, process_input, /* SHT_UNKNOWN12 */ process_progbits, process_progbits, /* SHT_UNKNOWN13 */ process_progbits, process_progbits, /* SHT_INIT_ARRAY */ process_array, NULL, /* SHT_FINI_ARRAY */ process_array, NULL, /* SHT_PREINIT_ARRAY */ process_array, NULL, /* SHT_GROUP */ process_section, invalid_section, /* SHT_SYMTAB_SHNDX */ process_sym_shndx, NULL }; static uintptr_t (*Final[SHT_NUM][2])() = { /* SHT_NULL */ NULL, NULL, /* SHT_PROGBITS */ NULL, NULL, /* SHT_SYMTAB */ ld_sym_process, ld_sym_process, /* SHT_STRTAB */ NULL, NULL, /* SHT_RELA */ rel_process, NULL, /* SHT_HASH */ NULL, NULL, /* SHT_DYNAMIC */ NULL, process_dynamic, /* SHT_NOTE */ NULL, NULL, /* SHT_NOBITS */ NULL, NULL, /* SHT_REL */ rel_process, NULL, /* SHT_SHLIB */ NULL, NULL, /* SHT_DYNSYM */ NULL, ld_sym_process, /* SHT_UNKNOWN12 */ NULL, NULL, /* SHT_UNKNOWN13 */ NULL, NULL, /* SHT_INIT_ARRAY */ NULL, NULL, /* SHT_FINI_ARRAY */ NULL, NULL, /* SHT_PREINIT_ARRAY */ NULL, NULL, /* SHT_GROUP */ NULL, NULL, /* SHT_SYMTAB_SHNDX */ sym_shndx_process, NULL }; #define MAXNDXSIZE 10 /* * Process an elf file. Each section is compared against the section state * table to determine whether it should be processed (saved), ignored, or * is invalid for the type of input file being processed. */ static uintptr_t process_elf(Ifl_desc *ifl, Elf *elf, Ofl_desc *ofl) { Elf_Scn *scn; Shdr *shdr; Word ndx, sndx; char *str, *name, _name[MAXNDXSIZE]; Word row, column; int ident; uintptr_t error; Is_desc *vdfisp, *vndisp, *vsyisp, *sifisp, * capisp; Sdf_desc *sdf; Word ordered_shndx = 0; /* index to first ordered section */ Word ordered_cnt = 0; /* * First process the .shstrtab section so that later sections can * reference their name. */ ld_sup_file(ofl, ifl->ifl_name, elf_kind(elf), ifl->ifl_flags, elf); sndx = ifl->ifl_shstrndx; if ((scn = elf_getscn(elf, (size_t)sndx)) == NULL) { eprintf(ofl->ofl_lml, ERR_ELF, MSG_INTL(MSG_ELF_GETSCN), ifl->ifl_name); ofl->ofl_flags |= FLG_OF_FATAL; return (0); } if ((shdr = elf_getshdr(scn)) == NULL) { eprintf(ofl->ofl_lml, ERR_ELF, MSG_INTL(MSG_ELF_GETSHDR), ifl->ifl_name); ofl->ofl_flags |= FLG_OF_FATAL; return (0); } if ((name = elf_strptr(elf, (size_t)sndx, (size_t)shdr->sh_name)) == NULL) { eprintf(ofl->ofl_lml, ERR_ELF, MSG_INTL(MSG_ELF_STRPTR), ifl->ifl_name); ofl->ofl_flags |= FLG_OF_FATAL; return (0); } if (ld_sup_input_section(ofl, ifl, name, &shdr, sndx, scn, elf) == S_ERROR) return (S_ERROR); /* * Reset the name since the shdr->sh_name could have been changed as * part of ld_sup_input_section(). If there is no name, fabricate one * using the section index. */ if (shdr->sh_name == 0) { (void) snprintf(_name, MAXNDXSIZE, MSG_ORIG(MSG_FMT_INDEX), EC_XWORD(sndx)); if ((name = libld_malloc(strlen(_name) + 1)) == 0) return (S_ERROR); (void) strcpy(name, _name); } else if ((name = elf_strptr(elf, (size_t)sndx, (size_t)shdr->sh_name)) == NULL) { eprintf(ofl->ofl_lml, ERR_ELF, MSG_INTL(MSG_ELF_STRPTR), ifl->ifl_name); ofl->ofl_flags |= FLG_OF_FATAL; return (0); } error = process_strtab(name, ifl, shdr, scn, sndx, FALSE, ofl); if ((error == 0) || (error == S_ERROR)) return (error); str = ifl->ifl_isdesc[sndx]->is_indata->d_buf; /* * Determine the state table column from the input file type. Note, * shared library sections are not added to the output section list. */ if (ifl->ifl_ehdr->e_type == ET_DYN) { column = 1; ofl->ofl_soscnt++; ident = M_ID_NULL; } else { column = 0; ofl->ofl_objscnt++; ident = M_ID_UNKNOWN; } DBG_CALL(Dbg_file_generic(ofl->ofl_lml, ifl)); ndx = 0; vdfisp = vndisp = vsyisp = sifisp = capisp = 0; scn = NULL; while (scn = elf_nextscn(elf, scn)) { ndx++; /* * As we've already processed the .shstrtab don't do it again. */ if (ndx == sndx) continue; if ((shdr = elf_getshdr(scn)) == NULL) { eprintf(ofl->ofl_lml, ERR_ELF, MSG_INTL(MSG_ELF_GETSHDR), ifl->ifl_name); ofl->ofl_flags |= FLG_OF_FATAL; return (0); } name = str + (size_t)(shdr->sh_name); if (ld_sup_input_section(ofl, ifl, name, &shdr, ndx, scn, elf) == S_ERROR) return (S_ERROR); /* * Reset the name since the shdr->sh_name could have been * changed as part of ld_sup_input_section(). If there is no * name, fabricate one using the section index. */ if (shdr->sh_name == 0) { (void) snprintf(_name, MAXNDXSIZE, MSG_ORIG(MSG_FMT_INDEX), EC_XWORD(ndx)); if ((name = libld_malloc(strlen(_name) + 1)) == 0) return (S_ERROR); (void) strcpy(name, _name); } else name = str + (size_t)(shdr->sh_name); row = shdr->sh_type; /* * If the section has the SHF_EXCLUDE flag on, and we're not * generating a relocatable object, exclude the section. */ if (((shdr->sh_flags & SHF_EXCLUDE) != 0) && ((ofl->ofl_flags & FLG_OF_RELOBJ) == 0)) { if ((error = process_exclude(name, ifl, shdr, scn, ndx, ofl)) == S_ERROR) return (S_ERROR); if (error == 1) continue; } /* * If this is a standard section type process it via the * appropriate action routine. */ if (row < SHT_NUM) { if (Initial[row][column] != NULL) { if (Initial[row][column](name, ifl, shdr, scn, ndx, ident, ofl) == S_ERROR) return (S_ERROR); } } else { /* * If this section is below SHT_LOSUNW then we don't * really know what to do with it, issue a warning * message but do the basic section processing anyway. */ if (row < (Word)SHT_LOSUNW) eprintf(ofl->ofl_lml, ERR_WARNING, MSG_INTL(MSG_FIL_INVALSEC), ifl->ifl_name, name, conv_sec_type(ifl->ifl_ehdr->e_machine, shdr->sh_type, 0)); /* * Handle sections greater than SHT_LOSUNW. */ switch (row) { case SHT_SUNW_dof: if (process_section(name, ifl, shdr, scn, ndx, ident, ofl) == S_ERROR) return (S_ERROR); break; case SHT_SUNW_cap: if (process_section(name, ifl, shdr, scn, ndx, M_ID_NULL, ofl) == S_ERROR) return (S_ERROR); capisp = ifl->ifl_isdesc[ndx]; break; case SHT_SUNW_DEBUGSTR: case SHT_SUNW_DEBUG: if (process_debug(name, ifl, shdr, scn, ndx, ident, ofl) == S_ERROR) return (S_ERROR); break; case SHT_SUNW_move: if (process_section(name, ifl, shdr, scn, ndx, M_ID_NULL, ofl) == S_ERROR) return (S_ERROR); break; case SHT_SUNW_syminfo: if (process_section(name, ifl, shdr, scn, ndx, M_ID_NULL, ofl) == S_ERROR) return (S_ERROR); sifisp = ifl->ifl_isdesc[ndx]; break; case SHT_SUNW_ANNOTATE: case SHT_SUNW_COMDAT: if (process_progbits(name, ifl, shdr, scn, ndx, ident, ofl) == S_ERROR) return (S_ERROR); break; case SHT_SUNW_verdef: if (process_section(name, ifl, shdr, scn, ndx, M_ID_NULL, ofl) == S_ERROR) return (S_ERROR); vdfisp = ifl->ifl_isdesc[ndx]; break; case SHT_SUNW_verneed: if (process_section(name, ifl, shdr, scn, ndx, M_ID_NULL, ofl) == S_ERROR) return (S_ERROR); vndisp = ifl->ifl_isdesc[ndx]; break; case SHT_SUNW_versym: if (process_section(name, ifl, shdr, scn, ndx, M_ID_NULL, ofl) == S_ERROR) return (S_ERROR); vsyisp = ifl->ifl_isdesc[ndx]; break; #if defined(sparc) case SHT_SPARC_GOTDATA: if (process_section(name, ifl, shdr, scn, ndx, M_ID_GOTDATA, ofl) == S_ERROR) return (S_ERROR); break; #endif #if (defined(__i386) || defined(__amd64)) && defined(_ELF64) case SHT_AMD64_UNWIND: if (column == 0) { /* * column == ET_REL */ if (process_amd64_unwind(name, ifl, shdr, scn, ndx, M_ID_UNWIND, ofl) == S_ERROR) return (S_ERROR); } break; #endif default: if (ident != M_ID_NULL) ident = M_ID_USER; if (process_section(name, ifl, shdr, scn, ndx, ident, ofl) == S_ERROR) return (S_ERROR); break; } } /* * If we have any sections that require ORDERED processing, * remember the index of the first ordered section. This let's * us know if we need an ORDERED place_section pass, and if so, * where to start. */ if (ifl->ifl_isdesc[ndx] && (ifl->ifl_isdesc[ndx]->is_shdr->sh_flags & ALL_SHF_ORDER)) { ordered_cnt++; if (ordered_shndx == 0) ordered_shndx = ndx; } } /* * Now that all of sections have been placed, scan through any sections * which have special ordering requirements and place them now. */ if (ordered_shndx) { Word cnt; for (ndx = ordered_shndx, cnt = 0; (ndx < ifl->ifl_shnum) && (cnt < ordered_cnt); ndx++) { Is_desc *isp; /* LINTED */ Os_desc *osp; if (((isp = ifl->ifl_isdesc[ndx]) == 0) || ((isp->is_shdr->sh_flags & ALL_SHF_ORDER) == 0)) continue; /* * If this is an ordered section, process it. */ cnt++; if ((osp = (Os_desc *)ld_process_ordered(ifl, ofl, ndx, ifl->ifl_shnum)) == (Os_desc *)S_ERROR) return (S_ERROR); #if (defined(__i386) || defined(__amd64)) && defined(_ELF64) /* * If this section is 'ordered' then it was not * caught in the previous 'place_section' operation. * * So - now that we have a OSP section for * the unwind info - record it. */ if (osp && (osp->os_shdr->sh_type == SHT_AMD64_UNWIND) && (append_amd64_unwind(osp, ofl) == S_ERROR)) return (S_ERROR); #endif } } /* * If this is an explicit shared object determine if the user has * specified a control definition. This descriptor may specify which * version definitions can be used from this object (it may also update * the dependency to USED and supply an alternative SONAME). */ sdf = 0; if (column && (ifl->ifl_flags & FLG_IF_NEEDED)) { const char *base; /* * Use the basename of the input file (typically this is the * compilation environment name, ie. libfoo.so). */ if ((base = strrchr(ifl->ifl_name, '/')) == NULL) base = ifl->ifl_name; else base++; if ((sdf = sdf_find(base, &ofl->ofl_socntl)) != 0) { sdf->sdf_file = ifl; ifl->ifl_sdfdesc = sdf; } } /* * Process any hardware/software capabilities sections. Only propagate * capabilities for input relocatable objects. If the object doesn't * contain any capabilities, any capability state that has already been * gathered will prevail. */ if (capisp && (ifl->ifl_ehdr->e_type == ET_REL)) process_cap(name, ifl, capisp, ofl); /* * Process any version dependencies. These will establish shared object * `needed' entries in the same manner as will be generated from the * .dynamic's NEEDED entries. */ if (vndisp && (ofl->ofl_flags & (FLG_OF_NOUNDEF | FLG_OF_SYMBOLIC))) if (ld_vers_need_process(vndisp, ifl, ofl) == S_ERROR) return (S_ERROR); /* * Before processing any symbol resolution or relocations process any * version sections. */ if (vsyisp) (void) ld_vers_sym_process(ofl->ofl_lml, vsyisp, ifl); if (ifl->ifl_versym && (vdfisp || (sdf && (sdf->sdf_flags & FLG_SDF_SELECT)))) if (ld_vers_def_process(vdfisp, ifl, ofl) == S_ERROR) return (S_ERROR); /* * Having collected the appropriate sections carry out any additional * processing if necessary. */ for (ndx = 0; ndx < ifl->ifl_shnum; ndx++) { Is_desc * isp; if ((isp = ifl->ifl_isdesc[ndx]) == 0) continue; row = isp->is_shdr->sh_type; if ((isp->is_flags & FLG_IS_DISCARD) == 0) ld_sup_section(ofl, isp->is_name, isp->is_shdr, ndx, isp->is_indata, elf); /* * If this is a ST_SUNW_move section from a * a relocatable file, keep the input section. */ if ((row == SHT_SUNW_move) && (column == 0)) { if (list_appendc(&(ofl->ofl_ismove), isp) == 0) return (S_ERROR); } /* * If this is a standard section type process it via the * appropriate action routine. */ if (row < SHT_NUM) { if (Final[row][column] != NULL) if (Final[row][column](isp, ifl, ofl) == S_ERROR) return (S_ERROR); } } /* * After processing any symbol resolution, and if this dependency * indicates it contains symbols that can't be directly bound to, * set the symbols appropriately. */ if (sifisp && ((ifl->ifl_flags & (FLG_IF_NEEDED | FLG_IF_NODIRECT)) == (FLG_IF_NEEDED | FLG_IF_NODIRECT))) (void) ld_sym_nodirect(sifisp, ifl, ofl); return (1); } /* * Process the current input file. There are basically three types of files * that come through here: * * o files explicitly defined on the command line (ie. foo.o or bar.so), * in this case only the `name' field is valid. * * o libraries determined from the -l command line option (ie. -lbar), * in this case the `soname' field contains the basename of the located * file. * * Any shared object specified via the above two conventions must be recorded * as a needed dependency. * * o libraries specified as dependencies of those libraries already obtained * via the command line (ie. bar.so has a DT_NEEDED entry of fred.so.1), * in this case the `soname' field contains either a full pathname (if the * needed entry contained a `/'), or the basename of the located file. * These libraries are processed to verify symbol binding but are not * recorded as dependencies of the output file being generated. */ Ifl_desc * ld_process_ifl(const char *name, const char *soname, int fd, Elf *elf, Half flags, Ofl_desc * ofl, Rej_desc * rej) { Ifl_desc *ifl; Ehdr *ehdr; Listnode *lnp; uintptr_t error = 0; struct stat status; Ar_desc *adp; Rej_desc _rej; /* * If this file was not extracted from an archive obtain its device * information. This will be used to determine if the file has already * been processed (rather than simply comparing filenames, the device * information provides a quicker comparison and detects linked files). */ if (!(flags & FLG_IF_EXTRACT)) (void) fstat(fd, &status); else { status.st_dev = 0; status.st_ino = 0; } switch (elf_kind(elf)) { case ELF_K_AR: /* * Determine if we've already come across this archive file. */ if (!(flags & FLG_IF_EXTRACT)) { for (LIST_TRAVERSE(&ofl->ofl_ars, lnp, adp)) { if ((adp->ad_stdev != status.st_dev) || (adp->ad_stino != status.st_ino)) continue; /* * We've seen this file before so reuse the * original archive descriptor and discard the * new elf descriptor. */ DBG_CALL(Dbg_file_reuse(ofl->ofl_lml, name, adp->ad_name)); (void) elf_end(elf); return ((Ifl_desc *)ld_process_archive(name, fd, adp, ofl)); } } /* * As we haven't processed this file before establish a new * archive descriptor. */ adp = ld_ar_setup(name, elf, ofl); if ((adp == 0) || (adp == (Ar_desc *)S_ERROR)) return ((Ifl_desc *)adp); adp->ad_stdev = status.st_dev; adp->ad_stino = status.st_ino; ld_sup_file(ofl, name, ELF_K_AR, flags, elf); return ((Ifl_desc *)ld_process_archive(name, fd, adp, ofl)); case ELF_K_ELF: /* * Obtain the elf header so that we can determine what type of * elf ELF_K_ELF file this is. */ if ((ehdr = elf_getehdr(elf)) == NULL) { int _class = gelf_getclass(elf); /* * Failure could occur for a number of reasons at this * point. Typically the files class is incorrect (ie. * user is building 64-bit but managed to pint at 32-bit * libraries). However any number of elf errors can * also occur, such as from a truncated or corrupt file. * Here we try and get the best error message possible. */ if (M_CLASS != _class) { _rej.rej_type = SGS_REJ_CLASS; _rej.rej_info = (uint_t)_class; } else { _rej.rej_type = SGS_REJ_STR; _rej.rej_str = elf_errmsg(-1); } _rej.rej_name = name; DBG_CALL(Dbg_file_rejected(ofl->ofl_lml, &_rej)); if (rej->rej_type == 0) { *rej = _rej; rej->rej_name = strdup(_rej.rej_name); } return (0); } /* * Determine if we've already come across this file. */ if (!(flags & FLG_IF_EXTRACT)) { List * lst; if (ehdr->e_type == ET_REL) lst = &ofl->ofl_objs; else lst = &ofl->ofl_sos; /* * Traverse the appropriate file list and determine if * a dev/inode match is found. */ for (LIST_TRAVERSE(lst, lnp, ifl)) { /* * Ifl_desc generated via -Nneed, therefore no * actual file behind it. */ if (ifl->ifl_flags & FLG_IF_NEEDSTR) continue; if ((ifl->ifl_stino != status.st_ino) || (ifl->ifl_stdev != status.st_dev)) continue; /* * Disregard (skip) this image. */ DBG_CALL(Dbg_file_skip(ofl->ofl_lml, ifl->ifl_name, name)); (void) elf_end(elf); /* * If the file was explicitly defined on the * command line (this is always the case for * relocatable objects, and is true for shared * objects when they weren't specified via -l or * were dragged in as an implicit dependency), * then warn the user. */ if ((flags & FLG_IF_CMDLINE) || (ifl->ifl_flags & FLG_IF_CMDLINE)) { const char *errmsg; /* * Determine whether this is the same * file name as originally encountered * so as to provide the most * descriptive diagnostic. */ if (strcmp(name, ifl->ifl_name) == 0) errmsg = MSG_INTL(MSG_FIL_MULINC_1); else errmsg = MSG_INTL(MSG_FIL_MULINC_2); eprintf(ofl->ofl_lml, ERR_WARNING, errmsg, name, ifl->ifl_name); } return (ifl); } } /* * At this point, we know we need the file. Establish an input * file descriptor and continue processing. */ ifl = ifl_setup(name, ehdr, elf, flags, ofl, rej); if ((ifl == 0) || (ifl == (Ifl_desc *)S_ERROR)) return (ifl); ifl->ifl_stdev = status.st_dev; ifl->ifl_stino = status.st_ino; /* * If -zignore is in effect, mark this file as a potential * candidate (the files use isn't actually determined until * symbol resolution and relocation processing are completed). */ if (ofl->ofl_flags1 & FLG_OF1_IGNORE) ifl->ifl_flags |= FLG_IF_IGNORE; switch (ehdr->e_type) { case ET_REL: ld_mach_eflags(ehdr, ofl); error = process_elf(ifl, elf, ofl); break; case ET_DYN: if ((ofl->ofl_flags & FLG_OF_STATIC) || !(ofl->ofl_flags & FLG_OF_DYNLIBS)) { eprintf(ofl->ofl_lml, ERR_FATAL, MSG_INTL(MSG_FIL_SOINSTAT), name); ofl->ofl_flags |= FLG_OF_FATAL; return (0); } /* * Record any additional shared object information. * If no soname is specified (eg. this file was * derived from a explicit filename declaration on the * command line, ie. bar.so) use the pathname. * This entry may be overridden if the files dynamic * section specifies an DT_SONAME value. */ if (soname == NULL) ifl->ifl_soname = ifl->ifl_name; else ifl->ifl_soname = soname; /* * If direct bindings, lazy loading, or group * permissions need to be established, mark this object. */ if (ofl->ofl_flags1 & FLG_OF1_ZDIRECT) ifl->ifl_flags |= FLG_IF_DIRECT; if (ofl->ofl_flags1 & FLG_OF1_LAZYLD) ifl->ifl_flags |= FLG_IF_LAZYLD; if (ofl->ofl_flags1 & FLG_OF1_GRPPRM) ifl->ifl_flags |= FLG_IF_GRPPRM; error = process_elf(ifl, elf, ofl); /* * At this point we know if this file will be * lazyloaded, or whether bindings to it must be direct. * In either case, a syminfo section is required. */ if (ifl->ifl_flags & (FLG_IF_LAZYLD | FLG_IF_DIRECT)) ofl->ofl_flags |= FLG_OF_SYMINFO; break; default: (void) elf_errno(); _rej.rej_type = SGS_REJ_UNKFILE; _rej.rej_name = name; DBG_CALL(Dbg_file_rejected(ofl->ofl_lml, &_rej)); if (rej->rej_type == 0) { *rej = _rej; rej->rej_name = strdup(_rej.rej_name); } return (0); } break; default: (void) elf_errno(); _rej.rej_type = SGS_REJ_UNKFILE; _rej.rej_name = name; DBG_CALL(Dbg_file_rejected(ofl->ofl_lml, &_rej)); if (rej->rej_type == 0) { *rej = _rej; rej->rej_name = strdup(_rej.rej_name); } return (0); } if ((error == 0) || (error == S_ERROR)) return ((Ifl_desc *)error); else return (ifl); } /* * Having successfully opened a file, set up the necessary elf structures to * process it further. This small section of processing is slightly different * from the elf initialization required to process a relocatable object from an * archive (see libs.c: process_archive()). */ Ifl_desc * ld_process_open(const char *path, size_t dlen, int fd, Ofl_desc *ofl, Half flags, Rej_desc * rej) { Elf * elf; if ((elf = elf_begin(fd, ELF_C_READ, NULL)) == NULL) { eprintf(ofl->ofl_lml, ERR_ELF, MSG_INTL(MSG_ELF_BEGIN), path); ofl->ofl_flags |= FLG_OF_FATAL; return (0); } return (ld_process_ifl(&path[0], &path[dlen], fd, elf, flags, ofl, rej)); } /* * Process a required library (i.e. the dependency of a shared object). * Combine the directory and filename, check the resultant path size, and try * opening the pathname. */ static Ifl_desc * process_req_lib(Sdf_desc *sdf, const char *dir, const char *file, Ofl_desc * ofl, Rej_desc * rej) { size_t dlen, plen; int fd; char path[PATH_MAX]; const char *_dir = dir; /* * Determine the sizes of the directory and filename to insure we don't * exceed our buffer. */ if ((dlen = strlen(dir)) == 0) { _dir = MSG_ORIG(MSG_STR_DOT); dlen = 1; } dlen++; plen = dlen + strlen(file) + 1; if (plen > PATH_MAX) { eprintf(ofl->ofl_lml, ERR_FATAL, MSG_INTL(MSG_FIL_PTHTOLONG), _dir, file); ofl->ofl_flags |= FLG_OF_FATAL; return (0); } /* * Build the entire pathname and try and open the file. */ (void) strcpy(path, _dir); (void) strcat(path, MSG_ORIG(MSG_STR_SLASH)); (void) strcat(path, file); DBG_CALL(Dbg_libs_req(ofl->ofl_lml, sdf->sdf_name, sdf->sdf_rfile, path)); if ((fd = open(path, O_RDONLY)) == -1) return (0); else { Ifl_desc *ifl; char *_path; if ((_path = libld_malloc(strlen(path) + 1)) == 0) return ((Ifl_desc *)S_ERROR); (void) strcpy(_path, path); ifl = ld_process_open(_path, dlen, fd, ofl, NULL, rej); (void) close(fd); return (ifl); } } /* * Finish any library processing. Walk the list of so's that have been listed * as "included" by shared objects we have previously processed. Examine them, * without adding them as explicit dependents of this program, in order to * complete our symbol definition process. The search path rules are: * * o use any user supplied paths, i.e. LD_LIBRARY_PATH and -L, then * * o use any RPATH defined within the parent shared object, then * * o use the default directories, i.e. LIBPATH or -YP. */ uintptr_t ld_finish_libs(Ofl_desc *ofl) { Listnode *lnp1; Sdf_desc *sdf; Rej_desc rej = { 0 }; /* * Make sure we are back in dynamic mode. */ ofl->ofl_flags |= FLG_OF_DYNLIBS; for (LIST_TRAVERSE(&ofl->ofl_soneed, lnp1, sdf)) { Listnode *lnp2; const char *path; int fd; Ifl_desc *ifl; const char *file = sdf->sdf_name; /* * See if this file has already been processed. At the time * this implicit dependency was determined there may still have * been more explicit dependencies to process. Note, if we ever * do parse the command line three times we would be able to * do all this checking when processing the dynamic section. */ if (sdf->sdf_file) continue; for (LIST_TRAVERSE(&ofl->ofl_sos, lnp2, ifl)) { if (!(ifl->ifl_flags & FLG_IF_NEEDSTR) && (strcmp(file, ifl->ifl_soname) == 0)) { sdf->sdf_file = ifl; break; } } if (sdf->sdf_file) continue; /* * If the current element embeds a "/", then it's to be taken * "as is", with no searching involved. */ for (path = file; *path; path++) if (*path == '/') break; if (*path) { DBG_CALL(Dbg_libs_req(ofl->ofl_lml, sdf->sdf_name, sdf->sdf_rfile, file)); if ((fd = open(file, O_RDONLY)) == -1) { eprintf(ofl->ofl_lml, ERR_WARNING, MSG_INTL(MSG_FIL_NOTFOUND), file, sdf->sdf_rfile); } else { Rej_desc _rej = { 0 }; ifl = ld_process_open(file, sizeof (file) + 1, fd, ofl, NULL, &_rej); (void) close(fd); if (ifl == (Ifl_desc *)S_ERROR) { return (S_ERROR); } if (_rej.rej_type) { eprintf(ofl->ofl_lml, ERR_WARNING, MSG_INTL(reject[_rej.rej_type]), _rej.rej_name ? rej.rej_name : MSG_INTL(MSG_STR_UNKNOWN), conv_reject_desc(&_rej)); } else sdf->sdf_file = ifl; } continue; } /* * Now search for this file in any user defined directories. */ for (LIST_TRAVERSE(&ofl->ofl_ulibdirs, lnp2, path)) { Rej_desc _rej = { 0 }; ifl = process_req_lib(sdf, path, file, ofl, &_rej); if (ifl == (Ifl_desc *)S_ERROR) { return (S_ERROR); } if (_rej.rej_type) { if (rej.rej_type == 0) { rej = _rej; rej.rej_name = strdup(_rej.rej_name); } } if (ifl) { sdf->sdf_file = ifl; break; } } if (sdf->sdf_file) continue; /* * Next use the local rules defined within the parent shared * object. */ if (sdf->sdf_rpath != NULL) { char *rpath, *next; rpath = libld_malloc(strlen(sdf->sdf_rpath) + 1); if (rpath == 0) return (S_ERROR); (void) strcpy(rpath, sdf->sdf_rpath); DBG_CALL(Dbg_libs_path(ofl->ofl_lml, rpath, LA_SER_RUNPATH, sdf->sdf_rfile)); if ((path = strtok_r(rpath, MSG_ORIG(MSG_STR_COLON), &next)) != NULL) { do { Rej_desc _rej = { 0 }; path = expand(sdf->sdf_rfile, path, &next); ifl = process_req_lib(sdf, path, file, ofl, &_rej); if (ifl == (Ifl_desc *)S_ERROR) { return (S_ERROR); } if (_rej.rej_type) { if (rej.rej_type == 0) { rej = _rej; rej.rej_name = strdup(_rej.rej_name); } } if (ifl) { sdf->sdf_file = ifl; break; } } while ((path = strtok_r(NULL, MSG_ORIG(MSG_STR_COLON), &next)) != NULL); } } if (sdf->sdf_file) continue; /* * Finally try the default library search directories. */ for (LIST_TRAVERSE(&ofl->ofl_dlibdirs, lnp2, path)) { Rej_desc _rej = { 0 }; ifl = process_req_lib(sdf, path, file, ofl, &rej); if (ifl == (Ifl_desc *)S_ERROR) { return (S_ERROR); } if (_rej.rej_type) { if (rej.rej_type == 0) { rej = _rej; rej.rej_name = strdup(_rej.rej_name); } } if (ifl) { sdf->sdf_file = ifl; break; } } if (sdf->sdf_file) continue; /* * If we've got this far we haven't found the shared object. * If an object was found, but was rejected for some reason, * print a diagnostic to that effect, otherwise generate a * generic "not found" diagnostic. */ if (rej.rej_type) { eprintf(ofl->ofl_lml, ERR_WARNING, MSG_INTL(reject[rej.rej_type]), rej.rej_name ? rej.rej_name : MSG_INTL(MSG_STR_UNKNOWN), conv_reject_desc(&rej)); } else { eprintf(ofl->ofl_lml, ERR_WARNING, MSG_INTL(MSG_FIL_NOTFOUND), file, sdf->sdf_rfile); } } /* * Finally, now that all objects have been input, make sure any version * requirements have been met. */ return (ld_vers_verify(ofl)); }