1442f04c3SJosh Poimboeuf /* 2442f04c3SJosh Poimboeuf * elf.c - ELF access library 3442f04c3SJosh Poimboeuf * 4442f04c3SJosh Poimboeuf * Adapted from kpatch (https://github.com/dynup/kpatch): 5442f04c3SJosh Poimboeuf * Copyright (C) 2013-2015 Josh Poimboeuf <jpoimboe@redhat.com> 6442f04c3SJosh Poimboeuf * Copyright (C) 2014 Seth Jennings <sjenning@redhat.com> 7442f04c3SJosh Poimboeuf * 8442f04c3SJosh Poimboeuf * This program is free software; you can redistribute it and/or 9442f04c3SJosh Poimboeuf * modify it under the terms of the GNU General Public License 10442f04c3SJosh Poimboeuf * as published by the Free Software Foundation; either version 2 11442f04c3SJosh Poimboeuf * of the License, or (at your option) any later version. 12442f04c3SJosh Poimboeuf * 13442f04c3SJosh Poimboeuf * This program is distributed in the hope that it will be useful, 14442f04c3SJosh Poimboeuf * but WITHOUT ANY WARRANTY; without even the implied warranty of 15442f04c3SJosh Poimboeuf * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 16442f04c3SJosh Poimboeuf * GNU General Public License for more details. 17442f04c3SJosh Poimboeuf * 18442f04c3SJosh Poimboeuf * You should have received a copy of the GNU General Public License 19442f04c3SJosh Poimboeuf * along with this program; if not, see <http://www.gnu.org/licenses/>. 20442f04c3SJosh Poimboeuf */ 21442f04c3SJosh Poimboeuf 22442f04c3SJosh Poimboeuf #include <sys/types.h> 23442f04c3SJosh Poimboeuf #include <sys/stat.h> 24442f04c3SJosh Poimboeuf #include <fcntl.h> 25442f04c3SJosh Poimboeuf #include <stdio.h> 26442f04c3SJosh Poimboeuf #include <stdlib.h> 27442f04c3SJosh Poimboeuf #include <string.h> 28442f04c3SJosh Poimboeuf #include <unistd.h> 29442f04c3SJosh Poimboeuf 30442f04c3SJosh Poimboeuf #include "elf.h" 31442f04c3SJosh Poimboeuf #include "warn.h" 32442f04c3SJosh Poimboeuf 33774bec3fSArnaldo Carvalho de Melo /* 34774bec3fSArnaldo Carvalho de Melo * Fallback for systems without this "read, mmaping if possible" cmd. 35774bec3fSArnaldo Carvalho de Melo */ 36774bec3fSArnaldo Carvalho de Melo #ifndef ELF_C_READ_MMAP 37774bec3fSArnaldo Carvalho de Melo #define ELF_C_READ_MMAP ELF_C_READ 38774bec3fSArnaldo Carvalho de Melo #endif 39774bec3fSArnaldo Carvalho de Melo 40442f04c3SJosh Poimboeuf struct section *find_section_by_name(struct elf *elf, const char *name) 41442f04c3SJosh Poimboeuf { 42442f04c3SJosh Poimboeuf struct section *sec; 43442f04c3SJosh Poimboeuf 44442f04c3SJosh Poimboeuf list_for_each_entry(sec, &elf->sections, list) 45442f04c3SJosh Poimboeuf if (!strcmp(sec->name, name)) 46442f04c3SJosh Poimboeuf return sec; 47442f04c3SJosh Poimboeuf 48442f04c3SJosh Poimboeuf return NULL; 49442f04c3SJosh Poimboeuf } 50442f04c3SJosh Poimboeuf 51442f04c3SJosh Poimboeuf static struct section *find_section_by_index(struct elf *elf, 52442f04c3SJosh Poimboeuf unsigned int idx) 53442f04c3SJosh Poimboeuf { 54442f04c3SJosh Poimboeuf struct section *sec; 55442f04c3SJosh Poimboeuf 56442f04c3SJosh Poimboeuf list_for_each_entry(sec, &elf->sections, list) 57442f04c3SJosh Poimboeuf if (sec->idx == idx) 58442f04c3SJosh Poimboeuf return sec; 59442f04c3SJosh Poimboeuf 60442f04c3SJosh Poimboeuf return NULL; 61442f04c3SJosh Poimboeuf } 62442f04c3SJosh Poimboeuf 63442f04c3SJosh Poimboeuf static struct symbol *find_symbol_by_index(struct elf *elf, unsigned int idx) 64442f04c3SJosh Poimboeuf { 65442f04c3SJosh Poimboeuf struct section *sec; 66442f04c3SJosh Poimboeuf struct symbol *sym; 67442f04c3SJosh Poimboeuf 68442f04c3SJosh Poimboeuf list_for_each_entry(sec, &elf->sections, list) 69042ba73fSJosh Poimboeuf hash_for_each_possible(sec->symbol_hash, sym, hash, idx) 70442f04c3SJosh Poimboeuf if (sym->idx == idx) 71442f04c3SJosh Poimboeuf return sym; 72442f04c3SJosh Poimboeuf 73442f04c3SJosh Poimboeuf return NULL; 74442f04c3SJosh Poimboeuf } 75442f04c3SJosh Poimboeuf 76442f04c3SJosh Poimboeuf struct symbol *find_symbol_by_offset(struct section *sec, unsigned long offset) 77442f04c3SJosh Poimboeuf { 78442f04c3SJosh Poimboeuf struct symbol *sym; 79442f04c3SJosh Poimboeuf 80a196e171SJosh Poimboeuf list_for_each_entry(sym, &sec->symbol_list, list) 81442f04c3SJosh Poimboeuf if (sym->type != STT_SECTION && 82442f04c3SJosh Poimboeuf sym->offset == offset) 83442f04c3SJosh Poimboeuf return sym; 84442f04c3SJosh Poimboeuf 85442f04c3SJosh Poimboeuf return NULL; 86442f04c3SJosh Poimboeuf } 87442f04c3SJosh Poimboeuf 885c51f4aeSJosh Poimboeuf struct symbol *find_symbol_containing(struct section *sec, unsigned long offset) 895c51f4aeSJosh Poimboeuf { 905c51f4aeSJosh Poimboeuf struct symbol *sym; 915c51f4aeSJosh Poimboeuf 925c51f4aeSJosh Poimboeuf list_for_each_entry(sym, &sec->symbol_list, list) 935c51f4aeSJosh Poimboeuf if (sym->type != STT_SECTION && 945c51f4aeSJosh Poimboeuf offset >= sym->offset && offset < sym->offset + sym->len) 955c51f4aeSJosh Poimboeuf return sym; 965c51f4aeSJosh Poimboeuf 975c51f4aeSJosh Poimboeuf return NULL; 985c51f4aeSJosh Poimboeuf } 995c51f4aeSJosh Poimboeuf 100442f04c3SJosh Poimboeuf struct rela *find_rela_by_dest_range(struct section *sec, unsigned long offset, 101442f04c3SJosh Poimboeuf unsigned int len) 102442f04c3SJosh Poimboeuf { 103442f04c3SJosh Poimboeuf struct rela *rela; 104042ba73fSJosh Poimboeuf unsigned long o; 105442f04c3SJosh Poimboeuf 106442f04c3SJosh Poimboeuf if (!sec->rela) 107442f04c3SJosh Poimboeuf return NULL; 108442f04c3SJosh Poimboeuf 109042ba73fSJosh Poimboeuf for (o = offset; o < offset + len; o++) 110042ba73fSJosh Poimboeuf hash_for_each_possible(sec->rela->rela_hash, rela, hash, o) 111042ba73fSJosh Poimboeuf if (rela->offset == o) 112442f04c3SJosh Poimboeuf return rela; 113442f04c3SJosh Poimboeuf 114442f04c3SJosh Poimboeuf return NULL; 115442f04c3SJosh Poimboeuf } 116442f04c3SJosh Poimboeuf 117442f04c3SJosh Poimboeuf struct rela *find_rela_by_dest(struct section *sec, unsigned long offset) 118442f04c3SJosh Poimboeuf { 119442f04c3SJosh Poimboeuf return find_rela_by_dest_range(sec, offset, 1); 120442f04c3SJosh Poimboeuf } 121442f04c3SJosh Poimboeuf 122442f04c3SJosh Poimboeuf struct symbol *find_containing_func(struct section *sec, unsigned long offset) 123442f04c3SJosh Poimboeuf { 124442f04c3SJosh Poimboeuf struct symbol *func; 125442f04c3SJosh Poimboeuf 126a196e171SJosh Poimboeuf list_for_each_entry(func, &sec->symbol_list, list) 127442f04c3SJosh Poimboeuf if (func->type == STT_FUNC && offset >= func->offset && 128442f04c3SJosh Poimboeuf offset < func->offset + func->len) 129442f04c3SJosh Poimboeuf return func; 130442f04c3SJosh Poimboeuf 131442f04c3SJosh Poimboeuf return NULL; 132442f04c3SJosh Poimboeuf } 133442f04c3SJosh Poimboeuf 134442f04c3SJosh Poimboeuf static int read_sections(struct elf *elf) 135442f04c3SJosh Poimboeuf { 136442f04c3SJosh Poimboeuf Elf_Scn *s = NULL; 137442f04c3SJosh Poimboeuf struct section *sec; 138442f04c3SJosh Poimboeuf size_t shstrndx, sections_nr; 139442f04c3SJosh Poimboeuf int i; 140442f04c3SJosh Poimboeuf 141442f04c3SJosh Poimboeuf if (elf_getshdrnum(elf->elf, §ions_nr)) { 142442f04c3SJosh Poimboeuf perror("elf_getshdrnum"); 143442f04c3SJosh Poimboeuf return -1; 144442f04c3SJosh Poimboeuf } 145442f04c3SJosh Poimboeuf 146442f04c3SJosh Poimboeuf if (elf_getshdrstrndx(elf->elf, &shstrndx)) { 147442f04c3SJosh Poimboeuf perror("elf_getshdrstrndx"); 148442f04c3SJosh Poimboeuf return -1; 149442f04c3SJosh Poimboeuf } 150442f04c3SJosh Poimboeuf 151442f04c3SJosh Poimboeuf for (i = 0; i < sections_nr; i++) { 152442f04c3SJosh Poimboeuf sec = malloc(sizeof(*sec)); 153442f04c3SJosh Poimboeuf if (!sec) { 154442f04c3SJosh Poimboeuf perror("malloc"); 155442f04c3SJosh Poimboeuf return -1; 156442f04c3SJosh Poimboeuf } 157442f04c3SJosh Poimboeuf memset(sec, 0, sizeof(*sec)); 158442f04c3SJosh Poimboeuf 159a196e171SJosh Poimboeuf INIT_LIST_HEAD(&sec->symbol_list); 160a196e171SJosh Poimboeuf INIT_LIST_HEAD(&sec->rela_list); 161042ba73fSJosh Poimboeuf hash_init(sec->rela_hash); 162042ba73fSJosh Poimboeuf hash_init(sec->symbol_hash); 163442f04c3SJosh Poimboeuf 164442f04c3SJosh Poimboeuf list_add_tail(&sec->list, &elf->sections); 165442f04c3SJosh Poimboeuf 166442f04c3SJosh Poimboeuf s = elf_getscn(elf->elf, i); 167442f04c3SJosh Poimboeuf if (!s) { 168442f04c3SJosh Poimboeuf perror("elf_getscn"); 169442f04c3SJosh Poimboeuf return -1; 170442f04c3SJosh Poimboeuf } 171442f04c3SJosh Poimboeuf 172442f04c3SJosh Poimboeuf sec->idx = elf_ndxscn(s); 173442f04c3SJosh Poimboeuf 174442f04c3SJosh Poimboeuf if (!gelf_getshdr(s, &sec->sh)) { 175442f04c3SJosh Poimboeuf perror("gelf_getshdr"); 176442f04c3SJosh Poimboeuf return -1; 177442f04c3SJosh Poimboeuf } 178442f04c3SJosh Poimboeuf 179442f04c3SJosh Poimboeuf sec->name = elf_strptr(elf->elf, shstrndx, sec->sh.sh_name); 180442f04c3SJosh Poimboeuf if (!sec->name) { 181442f04c3SJosh Poimboeuf perror("elf_strptr"); 182442f04c3SJosh Poimboeuf return -1; 183442f04c3SJosh Poimboeuf } 184442f04c3SJosh Poimboeuf 185442f04c3SJosh Poimboeuf sec->elf_data = elf_getdata(s, NULL); 186442f04c3SJosh Poimboeuf if (!sec->elf_data) { 187442f04c3SJosh Poimboeuf perror("elf_getdata"); 188442f04c3SJosh Poimboeuf return -1; 189442f04c3SJosh Poimboeuf } 190442f04c3SJosh Poimboeuf 191442f04c3SJosh Poimboeuf if (sec->elf_data->d_off != 0 || 192442f04c3SJosh Poimboeuf sec->elf_data->d_size != sec->sh.sh_size) { 193442f04c3SJosh Poimboeuf WARN("unexpected data attributes for %s", sec->name); 194442f04c3SJosh Poimboeuf return -1; 195442f04c3SJosh Poimboeuf } 196442f04c3SJosh Poimboeuf 197442f04c3SJosh Poimboeuf sec->data = (unsigned long)sec->elf_data->d_buf; 198442f04c3SJosh Poimboeuf sec->len = sec->elf_data->d_size; 199442f04c3SJosh Poimboeuf } 200442f04c3SJosh Poimboeuf 201442f04c3SJosh Poimboeuf /* sanity check, one more call to elf_nextscn() should return NULL */ 202442f04c3SJosh Poimboeuf if (elf_nextscn(elf->elf, s)) { 203442f04c3SJosh Poimboeuf WARN("section entry mismatch"); 204442f04c3SJosh Poimboeuf return -1; 205442f04c3SJosh Poimboeuf } 206442f04c3SJosh Poimboeuf 207442f04c3SJosh Poimboeuf return 0; 208442f04c3SJosh Poimboeuf } 209442f04c3SJosh Poimboeuf 210442f04c3SJosh Poimboeuf static int read_symbols(struct elf *elf) 211442f04c3SJosh Poimboeuf { 212442f04c3SJosh Poimboeuf struct section *symtab; 213442f04c3SJosh Poimboeuf struct symbol *sym; 214442f04c3SJosh Poimboeuf struct list_head *entry, *tmp; 215442f04c3SJosh Poimboeuf int symbols_nr, i; 216442f04c3SJosh Poimboeuf 217442f04c3SJosh Poimboeuf symtab = find_section_by_name(elf, ".symtab"); 218442f04c3SJosh Poimboeuf if (!symtab) { 219442f04c3SJosh Poimboeuf WARN("missing symbol table"); 220442f04c3SJosh Poimboeuf return -1; 221442f04c3SJosh Poimboeuf } 222442f04c3SJosh Poimboeuf 223442f04c3SJosh Poimboeuf symbols_nr = symtab->sh.sh_size / symtab->sh.sh_entsize; 224442f04c3SJosh Poimboeuf 225442f04c3SJosh Poimboeuf for (i = 0; i < symbols_nr; i++) { 226442f04c3SJosh Poimboeuf sym = malloc(sizeof(*sym)); 227442f04c3SJosh Poimboeuf if (!sym) { 228442f04c3SJosh Poimboeuf perror("malloc"); 229442f04c3SJosh Poimboeuf return -1; 230442f04c3SJosh Poimboeuf } 231442f04c3SJosh Poimboeuf memset(sym, 0, sizeof(*sym)); 232442f04c3SJosh Poimboeuf 233442f04c3SJosh Poimboeuf sym->idx = i; 234442f04c3SJosh Poimboeuf 235442f04c3SJosh Poimboeuf if (!gelf_getsym(symtab->elf_data, i, &sym->sym)) { 236442f04c3SJosh Poimboeuf perror("gelf_getsym"); 237442f04c3SJosh Poimboeuf goto err; 238442f04c3SJosh Poimboeuf } 239442f04c3SJosh Poimboeuf 240442f04c3SJosh Poimboeuf sym->name = elf_strptr(elf->elf, symtab->sh.sh_link, 241442f04c3SJosh Poimboeuf sym->sym.st_name); 242442f04c3SJosh Poimboeuf if (!sym->name) { 243442f04c3SJosh Poimboeuf perror("elf_strptr"); 244442f04c3SJosh Poimboeuf goto err; 245442f04c3SJosh Poimboeuf } 246442f04c3SJosh Poimboeuf 247442f04c3SJosh Poimboeuf sym->type = GELF_ST_TYPE(sym->sym.st_info); 248442f04c3SJosh Poimboeuf sym->bind = GELF_ST_BIND(sym->sym.st_info); 249442f04c3SJosh Poimboeuf 250442f04c3SJosh Poimboeuf if (sym->sym.st_shndx > SHN_UNDEF && 251442f04c3SJosh Poimboeuf sym->sym.st_shndx < SHN_LORESERVE) { 252442f04c3SJosh Poimboeuf sym->sec = find_section_by_index(elf, 253442f04c3SJosh Poimboeuf sym->sym.st_shndx); 254442f04c3SJosh Poimboeuf if (!sym->sec) { 255442f04c3SJosh Poimboeuf WARN("couldn't find section for symbol %s", 256442f04c3SJosh Poimboeuf sym->name); 257442f04c3SJosh Poimboeuf goto err; 258442f04c3SJosh Poimboeuf } 259442f04c3SJosh Poimboeuf if (sym->type == STT_SECTION) { 260442f04c3SJosh Poimboeuf sym->name = sym->sec->name; 261442f04c3SJosh Poimboeuf sym->sec->sym = sym; 262442f04c3SJosh Poimboeuf } 263442f04c3SJosh Poimboeuf } else 264442f04c3SJosh Poimboeuf sym->sec = find_section_by_index(elf, 0); 265442f04c3SJosh Poimboeuf 266442f04c3SJosh Poimboeuf sym->offset = sym->sym.st_value; 267442f04c3SJosh Poimboeuf sym->len = sym->sym.st_size; 268442f04c3SJosh Poimboeuf 269442f04c3SJosh Poimboeuf /* sorted insert into a per-section list */ 270a196e171SJosh Poimboeuf entry = &sym->sec->symbol_list; 271a196e171SJosh Poimboeuf list_for_each_prev(tmp, &sym->sec->symbol_list) { 272442f04c3SJosh Poimboeuf struct symbol *s; 273442f04c3SJosh Poimboeuf 274442f04c3SJosh Poimboeuf s = list_entry(tmp, struct symbol, list); 275442f04c3SJosh Poimboeuf 276442f04c3SJosh Poimboeuf if (sym->offset > s->offset) { 277442f04c3SJosh Poimboeuf entry = tmp; 278442f04c3SJosh Poimboeuf break; 279442f04c3SJosh Poimboeuf } 280442f04c3SJosh Poimboeuf 281442f04c3SJosh Poimboeuf if (sym->offset == s->offset && sym->len >= s->len) { 282442f04c3SJosh Poimboeuf entry = tmp; 283442f04c3SJosh Poimboeuf break; 284442f04c3SJosh Poimboeuf } 285442f04c3SJosh Poimboeuf } 286442f04c3SJosh Poimboeuf list_add(&sym->list, entry); 287042ba73fSJosh Poimboeuf hash_add(sym->sec->symbol_hash, &sym->hash, sym->idx); 288442f04c3SJosh Poimboeuf } 289442f04c3SJosh Poimboeuf 290442f04c3SJosh Poimboeuf return 0; 291442f04c3SJosh Poimboeuf 292442f04c3SJosh Poimboeuf err: 293442f04c3SJosh Poimboeuf free(sym); 294442f04c3SJosh Poimboeuf return -1; 295442f04c3SJosh Poimboeuf } 296442f04c3SJosh Poimboeuf 297442f04c3SJosh Poimboeuf static int read_relas(struct elf *elf) 298442f04c3SJosh Poimboeuf { 299442f04c3SJosh Poimboeuf struct section *sec; 300442f04c3SJosh Poimboeuf struct rela *rela; 301442f04c3SJosh Poimboeuf int i; 302442f04c3SJosh Poimboeuf unsigned int symndx; 303442f04c3SJosh Poimboeuf 304442f04c3SJosh Poimboeuf list_for_each_entry(sec, &elf->sections, list) { 305442f04c3SJosh Poimboeuf if (sec->sh.sh_type != SHT_RELA) 306442f04c3SJosh Poimboeuf continue; 307442f04c3SJosh Poimboeuf 308442f04c3SJosh Poimboeuf sec->base = find_section_by_name(elf, sec->name + 5); 309442f04c3SJosh Poimboeuf if (!sec->base) { 310442f04c3SJosh Poimboeuf WARN("can't find base section for rela section %s", 311442f04c3SJosh Poimboeuf sec->name); 312442f04c3SJosh Poimboeuf return -1; 313442f04c3SJosh Poimboeuf } 314442f04c3SJosh Poimboeuf 315442f04c3SJosh Poimboeuf sec->base->rela = sec; 316442f04c3SJosh Poimboeuf 317442f04c3SJosh Poimboeuf for (i = 0; i < sec->sh.sh_size / sec->sh.sh_entsize; i++) { 318442f04c3SJosh Poimboeuf rela = malloc(sizeof(*rela)); 319442f04c3SJosh Poimboeuf if (!rela) { 320442f04c3SJosh Poimboeuf perror("malloc"); 321442f04c3SJosh Poimboeuf return -1; 322442f04c3SJosh Poimboeuf } 323442f04c3SJosh Poimboeuf memset(rela, 0, sizeof(*rela)); 324442f04c3SJosh Poimboeuf 325442f04c3SJosh Poimboeuf if (!gelf_getrela(sec->elf_data, i, &rela->rela)) { 326442f04c3SJosh Poimboeuf perror("gelf_getrela"); 327442f04c3SJosh Poimboeuf return -1; 328442f04c3SJosh Poimboeuf } 329442f04c3SJosh Poimboeuf 330442f04c3SJosh Poimboeuf rela->type = GELF_R_TYPE(rela->rela.r_info); 331442f04c3SJosh Poimboeuf rela->addend = rela->rela.r_addend; 332442f04c3SJosh Poimboeuf rela->offset = rela->rela.r_offset; 333442f04c3SJosh Poimboeuf symndx = GELF_R_SYM(rela->rela.r_info); 334442f04c3SJosh Poimboeuf rela->sym = find_symbol_by_index(elf, symndx); 335442f04c3SJosh Poimboeuf if (!rela->sym) { 336442f04c3SJosh Poimboeuf WARN("can't find rela entry symbol %d for %s", 337442f04c3SJosh Poimboeuf symndx, sec->name); 338442f04c3SJosh Poimboeuf return -1; 339442f04c3SJosh Poimboeuf } 340042ba73fSJosh Poimboeuf 341042ba73fSJosh Poimboeuf list_add_tail(&rela->list, &sec->rela_list); 342042ba73fSJosh Poimboeuf hash_add(sec->rela_hash, &rela->hash, rela->offset); 343042ba73fSJosh Poimboeuf 344442f04c3SJosh Poimboeuf } 345442f04c3SJosh Poimboeuf } 346442f04c3SJosh Poimboeuf 347442f04c3SJosh Poimboeuf return 0; 348442f04c3SJosh Poimboeuf } 349442f04c3SJosh Poimboeuf 350442f04c3SJosh Poimboeuf struct elf *elf_open(const char *name) 351442f04c3SJosh Poimboeuf { 352442f04c3SJosh Poimboeuf struct elf *elf; 353442f04c3SJosh Poimboeuf 354442f04c3SJosh Poimboeuf elf_version(EV_CURRENT); 355442f04c3SJosh Poimboeuf 356442f04c3SJosh Poimboeuf elf = malloc(sizeof(*elf)); 357442f04c3SJosh Poimboeuf if (!elf) { 358442f04c3SJosh Poimboeuf perror("malloc"); 359442f04c3SJosh Poimboeuf return NULL; 360442f04c3SJosh Poimboeuf } 361442f04c3SJosh Poimboeuf memset(elf, 0, sizeof(*elf)); 362442f04c3SJosh Poimboeuf 363442f04c3SJosh Poimboeuf INIT_LIST_HEAD(&elf->sections); 364442f04c3SJosh Poimboeuf 365442f04c3SJosh Poimboeuf elf->name = strdup(name); 366442f04c3SJosh Poimboeuf if (!elf->name) { 367442f04c3SJosh Poimboeuf perror("strdup"); 368442f04c3SJosh Poimboeuf goto err; 369442f04c3SJosh Poimboeuf } 370442f04c3SJosh Poimboeuf 371442f04c3SJosh Poimboeuf elf->fd = open(name, O_RDONLY); 372442f04c3SJosh Poimboeuf if (elf->fd == -1) { 373442f04c3SJosh Poimboeuf perror("open"); 374442f04c3SJosh Poimboeuf goto err; 375442f04c3SJosh Poimboeuf } 376442f04c3SJosh Poimboeuf 377442f04c3SJosh Poimboeuf elf->elf = elf_begin(elf->fd, ELF_C_READ_MMAP, NULL); 378442f04c3SJosh Poimboeuf if (!elf->elf) { 379442f04c3SJosh Poimboeuf perror("elf_begin"); 380442f04c3SJosh Poimboeuf goto err; 381442f04c3SJosh Poimboeuf } 382442f04c3SJosh Poimboeuf 383442f04c3SJosh Poimboeuf if (!gelf_getehdr(elf->elf, &elf->ehdr)) { 384442f04c3SJosh Poimboeuf perror("gelf_getehdr"); 385442f04c3SJosh Poimboeuf goto err; 386442f04c3SJosh Poimboeuf } 387442f04c3SJosh Poimboeuf 388442f04c3SJosh Poimboeuf if (read_sections(elf)) 389442f04c3SJosh Poimboeuf goto err; 390442f04c3SJosh Poimboeuf 391442f04c3SJosh Poimboeuf if (read_symbols(elf)) 392442f04c3SJosh Poimboeuf goto err; 393442f04c3SJosh Poimboeuf 394442f04c3SJosh Poimboeuf if (read_relas(elf)) 395442f04c3SJosh Poimboeuf goto err; 396442f04c3SJosh Poimboeuf 397442f04c3SJosh Poimboeuf return elf; 398442f04c3SJosh Poimboeuf 399442f04c3SJosh Poimboeuf err: 400442f04c3SJosh Poimboeuf elf_close(elf); 401442f04c3SJosh Poimboeuf return NULL; 402442f04c3SJosh Poimboeuf } 403442f04c3SJosh Poimboeuf 404442f04c3SJosh Poimboeuf void elf_close(struct elf *elf) 405442f04c3SJosh Poimboeuf { 406442f04c3SJosh Poimboeuf struct section *sec, *tmpsec; 407442f04c3SJosh Poimboeuf struct symbol *sym, *tmpsym; 408442f04c3SJosh Poimboeuf struct rela *rela, *tmprela; 409442f04c3SJosh Poimboeuf 410442f04c3SJosh Poimboeuf list_for_each_entry_safe(sec, tmpsec, &elf->sections, list) { 411a196e171SJosh Poimboeuf list_for_each_entry_safe(sym, tmpsym, &sec->symbol_list, list) { 412442f04c3SJosh Poimboeuf list_del(&sym->list); 413042ba73fSJosh Poimboeuf hash_del(&sym->hash); 414442f04c3SJosh Poimboeuf free(sym); 415442f04c3SJosh Poimboeuf } 416a196e171SJosh Poimboeuf list_for_each_entry_safe(rela, tmprela, &sec->rela_list, list) { 417442f04c3SJosh Poimboeuf list_del(&rela->list); 418042ba73fSJosh Poimboeuf hash_del(&rela->hash); 419442f04c3SJosh Poimboeuf free(rela); 420442f04c3SJosh Poimboeuf } 421442f04c3SJosh Poimboeuf list_del(&sec->list); 422442f04c3SJosh Poimboeuf free(sec); 423442f04c3SJosh Poimboeuf } 424442f04c3SJosh Poimboeuf if (elf->name) 425442f04c3SJosh Poimboeuf free(elf->name); 426442f04c3SJosh Poimboeuf if (elf->fd > 0) 427442f04c3SJosh Poimboeuf close(elf->fd); 428442f04c3SJosh Poimboeuf if (elf->elf) 429442f04c3SJosh Poimboeuf elf_end(elf->elf); 430442f04c3SJosh Poimboeuf free(elf); 431442f04c3SJosh Poimboeuf } 432