103333823c75a1c1887e923828113a1b0fd12020cElliott Hughes/* Returns the build id if found in a NT_GNU_BUILD_ID note. 203333823c75a1c1887e923828113a1b0fd12020cElliott Hughes Copyright (C) 2014 Red Hat, Inc. 303333823c75a1c1887e923828113a1b0fd12020cElliott Hughes This file is part of elfutils. 403333823c75a1c1887e923828113a1b0fd12020cElliott Hughes 503333823c75a1c1887e923828113a1b0fd12020cElliott Hughes This file is free software; you can redistribute it and/or modify 603333823c75a1c1887e923828113a1b0fd12020cElliott Hughes it under the terms of either 703333823c75a1c1887e923828113a1b0fd12020cElliott Hughes 803333823c75a1c1887e923828113a1b0fd12020cElliott Hughes * the GNU Lesser General Public License as published by the Free 903333823c75a1c1887e923828113a1b0fd12020cElliott Hughes Software Foundation; either version 3 of the License, or (at 1003333823c75a1c1887e923828113a1b0fd12020cElliott Hughes your option) any later version 1103333823c75a1c1887e923828113a1b0fd12020cElliott Hughes 1203333823c75a1c1887e923828113a1b0fd12020cElliott Hughes or 1303333823c75a1c1887e923828113a1b0fd12020cElliott Hughes 1403333823c75a1c1887e923828113a1b0fd12020cElliott Hughes * the GNU General Public License as published by the Free 1503333823c75a1c1887e923828113a1b0fd12020cElliott Hughes Software Foundation; either version 2 of the License, or (at 1603333823c75a1c1887e923828113a1b0fd12020cElliott Hughes your option) any later version 1703333823c75a1c1887e923828113a1b0fd12020cElliott Hughes 1803333823c75a1c1887e923828113a1b0fd12020cElliott Hughes or both in parallel, as here. 1903333823c75a1c1887e923828113a1b0fd12020cElliott Hughes 2003333823c75a1c1887e923828113a1b0fd12020cElliott Hughes elfutils is distributed in the hope that it will be useful, but 2103333823c75a1c1887e923828113a1b0fd12020cElliott Hughes WITHOUT ANY WARRANTY; without even the implied warranty of 2203333823c75a1c1887e923828113a1b0fd12020cElliott Hughes MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 2303333823c75a1c1887e923828113a1b0fd12020cElliott Hughes General Public License for more details. 2403333823c75a1c1887e923828113a1b0fd12020cElliott Hughes 2503333823c75a1c1887e923828113a1b0fd12020cElliott Hughes You should have received copies of the GNU General Public License and 2603333823c75a1c1887e923828113a1b0fd12020cElliott Hughes the GNU Lesser General Public License along with this program. If 2703333823c75a1c1887e923828113a1b0fd12020cElliott Hughes not, see <http://www.gnu.org/licenses/>. */ 2803333823c75a1c1887e923828113a1b0fd12020cElliott Hughes 2903333823c75a1c1887e923828113a1b0fd12020cElliott Hughes#ifdef HAVE_CONFIG_H 3003333823c75a1c1887e923828113a1b0fd12020cElliott Hughes# include <config.h> 3103333823c75a1c1887e923828113a1b0fd12020cElliott Hughes#endif 3203333823c75a1c1887e923828113a1b0fd12020cElliott Hughes 3303333823c75a1c1887e923828113a1b0fd12020cElliott Hughes#include "libdwelfP.h" 3403333823c75a1c1887e923828113a1b0fd12020cElliott Hughes#include "libdwflP.h" 3503333823c75a1c1887e923828113a1b0fd12020cElliott Hughes 3603333823c75a1c1887e923828113a1b0fd12020cElliott Hughes#define NO_VADDR ((GElf_Addr) -1l) 3703333823c75a1c1887e923828113a1b0fd12020cElliott Hughes 3803333823c75a1c1887e923828113a1b0fd12020cElliott Hughes/* Defined here for reuse. The dwelf interface doesn't care about the 3903333823c75a1c1887e923828113a1b0fd12020cElliott Hughes address of the note, but libdwfl does. */ 4003333823c75a1c1887e923828113a1b0fd12020cElliott Hughesstatic int 4103333823c75a1c1887e923828113a1b0fd12020cElliott Hughesfind_elf_build_id (Dwfl_Module *mod, int e_type, Elf *elf, 4203333823c75a1c1887e923828113a1b0fd12020cElliott Hughes const void **build_id_bits, GElf_Addr *build_id_elfaddr, 4303333823c75a1c1887e923828113a1b0fd12020cElliott Hughes int *build_id_len) 4403333823c75a1c1887e923828113a1b0fd12020cElliott Hughes{ 4503333823c75a1c1887e923828113a1b0fd12020cElliott Hughes int check_notes (Elf_Data *data, GElf_Addr data_elfaddr) 4603333823c75a1c1887e923828113a1b0fd12020cElliott Hughes { 4703333823c75a1c1887e923828113a1b0fd12020cElliott Hughes size_t pos = 0; 4803333823c75a1c1887e923828113a1b0fd12020cElliott Hughes GElf_Nhdr nhdr; 4903333823c75a1c1887e923828113a1b0fd12020cElliott Hughes size_t name_pos; 5003333823c75a1c1887e923828113a1b0fd12020cElliott Hughes size_t desc_pos; 5103333823c75a1c1887e923828113a1b0fd12020cElliott Hughes while ((pos = gelf_getnote (data, pos, &nhdr, &name_pos, &desc_pos)) > 0) 5203333823c75a1c1887e923828113a1b0fd12020cElliott Hughes if (nhdr.n_type == NT_GNU_BUILD_ID 5303333823c75a1c1887e923828113a1b0fd12020cElliott Hughes && nhdr.n_namesz == sizeof "GNU" && !memcmp (data->d_buf + name_pos, 5403333823c75a1c1887e923828113a1b0fd12020cElliott Hughes "GNU", sizeof "GNU")) 5503333823c75a1c1887e923828113a1b0fd12020cElliott Hughes { 5603333823c75a1c1887e923828113a1b0fd12020cElliott Hughes *build_id_bits = data->d_buf + desc_pos; 5703333823c75a1c1887e923828113a1b0fd12020cElliott Hughes *build_id_elfaddr = (data_elfaddr == NO_VADDR 5803333823c75a1c1887e923828113a1b0fd12020cElliott Hughes ? 0 : data_elfaddr + desc_pos); 5903333823c75a1c1887e923828113a1b0fd12020cElliott Hughes *build_id_len = nhdr.n_descsz; 6003333823c75a1c1887e923828113a1b0fd12020cElliott Hughes return 1; 6103333823c75a1c1887e923828113a1b0fd12020cElliott Hughes } 6203333823c75a1c1887e923828113a1b0fd12020cElliott Hughes return 0; 6303333823c75a1c1887e923828113a1b0fd12020cElliott Hughes } 6403333823c75a1c1887e923828113a1b0fd12020cElliott Hughes 6503333823c75a1c1887e923828113a1b0fd12020cElliott Hughes size_t shstrndx = SHN_UNDEF; 6603333823c75a1c1887e923828113a1b0fd12020cElliott Hughes int result = 0; 6703333823c75a1c1887e923828113a1b0fd12020cElliott Hughes 6803333823c75a1c1887e923828113a1b0fd12020cElliott Hughes Elf_Scn *scn = elf_nextscn (elf, NULL); 6903333823c75a1c1887e923828113a1b0fd12020cElliott Hughes 7003333823c75a1c1887e923828113a1b0fd12020cElliott Hughes if (scn == NULL) 7103333823c75a1c1887e923828113a1b0fd12020cElliott Hughes { 7203333823c75a1c1887e923828113a1b0fd12020cElliott Hughes /* No sections, have to look for phdrs. */ 7303333823c75a1c1887e923828113a1b0fd12020cElliott Hughes size_t phnum; 7403333823c75a1c1887e923828113a1b0fd12020cElliott Hughes if (unlikely (elf_getphdrnum (elf, &phnum) != 0)) 7503333823c75a1c1887e923828113a1b0fd12020cElliott Hughes { 7603333823c75a1c1887e923828113a1b0fd12020cElliott Hughes if (mod != NULL) 7703333823c75a1c1887e923828113a1b0fd12020cElliott Hughes __libdwfl_seterrno (DWFL_E_LIBELF); 7803333823c75a1c1887e923828113a1b0fd12020cElliott Hughes return -1; 7903333823c75a1c1887e923828113a1b0fd12020cElliott Hughes } 8003333823c75a1c1887e923828113a1b0fd12020cElliott Hughes for (size_t i = 0; result == 0 && i < phnum; ++i) 8103333823c75a1c1887e923828113a1b0fd12020cElliott Hughes { 8203333823c75a1c1887e923828113a1b0fd12020cElliott Hughes GElf_Phdr phdr_mem; 8303333823c75a1c1887e923828113a1b0fd12020cElliott Hughes GElf_Phdr *phdr = gelf_getphdr (elf, i, &phdr_mem); 8403333823c75a1c1887e923828113a1b0fd12020cElliott Hughes if (likely (phdr != NULL) && phdr->p_type == PT_NOTE) 8503333823c75a1c1887e923828113a1b0fd12020cElliott Hughes result = check_notes (elf_getdata_rawchunk (elf, 8603333823c75a1c1887e923828113a1b0fd12020cElliott Hughes phdr->p_offset, 8703333823c75a1c1887e923828113a1b0fd12020cElliott Hughes phdr->p_filesz, 8803333823c75a1c1887e923828113a1b0fd12020cElliott Hughes ELF_T_NHDR), 8903333823c75a1c1887e923828113a1b0fd12020cElliott Hughes phdr->p_vaddr); 9003333823c75a1c1887e923828113a1b0fd12020cElliott Hughes } 9103333823c75a1c1887e923828113a1b0fd12020cElliott Hughes } 9203333823c75a1c1887e923828113a1b0fd12020cElliott Hughes else 9303333823c75a1c1887e923828113a1b0fd12020cElliott Hughes do 9403333823c75a1c1887e923828113a1b0fd12020cElliott Hughes { 9503333823c75a1c1887e923828113a1b0fd12020cElliott Hughes GElf_Shdr shdr_mem; 9603333823c75a1c1887e923828113a1b0fd12020cElliott Hughes GElf_Shdr *shdr = gelf_getshdr (scn, &shdr_mem); 9703333823c75a1c1887e923828113a1b0fd12020cElliott Hughes if (likely (shdr != NULL) && shdr->sh_type == SHT_NOTE) 9803333823c75a1c1887e923828113a1b0fd12020cElliott Hughes { 9903333823c75a1c1887e923828113a1b0fd12020cElliott Hughes /* Determine the right sh_addr in this module. */ 10003333823c75a1c1887e923828113a1b0fd12020cElliott Hughes GElf_Addr vaddr = 0; 10103333823c75a1c1887e923828113a1b0fd12020cElliott Hughes if (!(shdr->sh_flags & SHF_ALLOC)) 10203333823c75a1c1887e923828113a1b0fd12020cElliott Hughes vaddr = NO_VADDR; 10303333823c75a1c1887e923828113a1b0fd12020cElliott Hughes else if (mod == NULL || e_type != ET_REL) 10403333823c75a1c1887e923828113a1b0fd12020cElliott Hughes vaddr = shdr->sh_addr; 10503333823c75a1c1887e923828113a1b0fd12020cElliott Hughes else if (__libdwfl_relocate_value (mod, elf, &shstrndx, 10603333823c75a1c1887e923828113a1b0fd12020cElliott Hughes elf_ndxscn (scn), &vaddr)) 10703333823c75a1c1887e923828113a1b0fd12020cElliott Hughes vaddr = NO_VADDR; 10803333823c75a1c1887e923828113a1b0fd12020cElliott Hughes result = check_notes (elf_getdata (scn, NULL), vaddr); 10903333823c75a1c1887e923828113a1b0fd12020cElliott Hughes } 11003333823c75a1c1887e923828113a1b0fd12020cElliott Hughes } 11103333823c75a1c1887e923828113a1b0fd12020cElliott Hughes while (result == 0 && (scn = elf_nextscn (elf, scn)) != NULL); 11203333823c75a1c1887e923828113a1b0fd12020cElliott Hughes 11303333823c75a1c1887e923828113a1b0fd12020cElliott Hughes return result; 11403333823c75a1c1887e923828113a1b0fd12020cElliott Hughes} 11503333823c75a1c1887e923828113a1b0fd12020cElliott Hughes 11603333823c75a1c1887e923828113a1b0fd12020cElliott Hughesint 11703333823c75a1c1887e923828113a1b0fd12020cElliott Hughesinternal_function 11803333823c75a1c1887e923828113a1b0fd12020cElliott Hughes__libdwfl_find_elf_build_id (Dwfl_Module *mod, Elf *elf, 11903333823c75a1c1887e923828113a1b0fd12020cElliott Hughes const void **build_id_bits, 12003333823c75a1c1887e923828113a1b0fd12020cElliott Hughes GElf_Addr *build_id_elfaddr, int *build_id_len) 12103333823c75a1c1887e923828113a1b0fd12020cElliott Hughes{ 12203333823c75a1c1887e923828113a1b0fd12020cElliott Hughes GElf_Ehdr ehdr_mem, *ehdr = gelf_getehdr (elf, &ehdr_mem); 12303333823c75a1c1887e923828113a1b0fd12020cElliott Hughes if (unlikely (ehdr == NULL)) 12403333823c75a1c1887e923828113a1b0fd12020cElliott Hughes { 12503333823c75a1c1887e923828113a1b0fd12020cElliott Hughes __libdwfl_seterrno (DWFL_E_LIBELF); 12603333823c75a1c1887e923828113a1b0fd12020cElliott Hughes return -1; 12703333823c75a1c1887e923828113a1b0fd12020cElliott Hughes } 12803333823c75a1c1887e923828113a1b0fd12020cElliott Hughes // MOD->E_TYPE is zero here. 12903333823c75a1c1887e923828113a1b0fd12020cElliott Hughes assert (ehdr->e_type != ET_REL || mod != NULL); 13003333823c75a1c1887e923828113a1b0fd12020cElliott Hughes 13103333823c75a1c1887e923828113a1b0fd12020cElliott Hughes return find_elf_build_id (mod, ehdr->e_type, elf, 13203333823c75a1c1887e923828113a1b0fd12020cElliott Hughes build_id_bits, build_id_elfaddr, build_id_len); 13303333823c75a1c1887e923828113a1b0fd12020cElliott Hughes} 13403333823c75a1c1887e923828113a1b0fd12020cElliott Hughes 13503333823c75a1c1887e923828113a1b0fd12020cElliott Hughesssize_t 13603333823c75a1c1887e923828113a1b0fd12020cElliott Hughesdwelf_elf_gnu_build_id (Elf *elf, const void **build_idp) 13703333823c75a1c1887e923828113a1b0fd12020cElliott Hughes{ 13803333823c75a1c1887e923828113a1b0fd12020cElliott Hughes GElf_Addr build_id_elfaddr; 13903333823c75a1c1887e923828113a1b0fd12020cElliott Hughes int build_id_len; 14003333823c75a1c1887e923828113a1b0fd12020cElliott Hughes int result = find_elf_build_id (NULL, ET_NONE, elf, build_idp, 14103333823c75a1c1887e923828113a1b0fd12020cElliott Hughes &build_id_elfaddr, &build_id_len); 14203333823c75a1c1887e923828113a1b0fd12020cElliott Hughes if (result > 0) 14303333823c75a1c1887e923828113a1b0fd12020cElliott Hughes return build_id_len; 14403333823c75a1c1887e923828113a1b0fd12020cElliott Hughes 14503333823c75a1c1887e923828113a1b0fd12020cElliott Hughes return result; 14603333823c75a1c1887e923828113a1b0fd12020cElliott Hughes} 14703333823c75a1c1887e923828113a1b0fd12020cElliott HughesINTDEF(dwelf_elf_gnu_build_id) 148