int gelf_update_rela(Elf_Data *d, int ndx, GElf_Rela *dr) { int ec; Elf *e; Elf_Scn *scn; Elf32_Rela *rela32; Elf64_Rela *rela64; size_t msz; uint32_t sh_type; if (d == NULL || ndx < 0 || dr == NULL || (scn = d->d_scn) == NULL || (e = scn->s_elf) == NULL) { LIBELF_SET_ERROR(ARGUMENT, 0); return (0); } ec = e->e_class; assert(ec == ELFCLASS32 || ec == ELFCLASS64); if (ec == ELFCLASS32) sh_type = scn->s_shdr.s_shdr32.sh_type; else sh_type = scn->s_shdr.s_shdr64.sh_type; if (_libelf_xlate_shtype(sh_type) != ELF_T_RELA) { LIBELF_SET_ERROR(ARGUMENT, 0); return (0); } msz = _libelf_msize(ELF_T_RELA, ec, e->e_version); assert(msz > 0); if (msz * ndx >= d->d_size) { LIBELF_SET_ERROR(ARGUMENT, 0); return (0); } if (ec == ELFCLASS32) { rela32 = (Elf32_Rela *) d->d_buf + ndx; LIBELF_COPY_U32(rela32, dr, r_offset); if (ELF64_R_SYM(dr->r_info) > ELF32_R_SYM(~0UL) || ELF64_R_TYPE(dr->r_info) > ELF32_R_TYPE(~0U)) { LIBELF_SET_ERROR(RANGE, 0); return (0); } rela32->r_info = ELF32_R_INFO(ELF64_R_SYM(dr->r_info), ELF64_R_TYPE(dr->r_info)); LIBELF_COPY_S32(rela32, dr, r_addend); } else { rela64 = (Elf64_Rela *) d->d_buf + ndx; *rela64 = *dr; } return (1); }
Elf_Data * elf_getdata(Elf_Scn *s, Elf_Data *ed) { Elf *e; unsigned int sh_type; int elfclass, elftype; size_t count, fsz, msz; struct _Libelf_Data *d; uint64_t sh_align, sh_offset, sh_size; int (*xlate)(unsigned char *_d, size_t _dsz, unsigned char *_s, size_t _c, int _swap); d = (struct _Libelf_Data *) ed; if (s == NULL || (e = s->s_elf) == NULL || (d != NULL && s != d->d_scn)) { LIBELF_SET_ERROR(ARGUMENT, 0); return (NULL); } assert(e->e_kind == ELF_K_ELF); if (d == NULL && (d = STAILQ_FIRST(&s->s_data)) != NULL) return (&d->d_data); if (d != NULL) return (&STAILQ_NEXT(d, d_next)->d_data); if (e->e_rawfile == NULL) { /* * In the ELF_C_WRITE case, there is no source that * can provide data for the section. */ LIBELF_SET_ERROR(ARGUMENT, 0); return (NULL); } elfclass = e->e_class; assert(elfclass == ELFCLASS32 || elfclass == ELFCLASS64); if (elfclass == ELFCLASS32) { sh_type = s->s_shdr.s_shdr32.sh_type; sh_offset = (uint64_t) s->s_shdr.s_shdr32.sh_offset; sh_size = (uint64_t) s->s_shdr.s_shdr32.sh_size; sh_align = (uint64_t) s->s_shdr.s_shdr32.sh_addralign; } else { sh_type = s->s_shdr.s_shdr64.sh_type; sh_offset = s->s_shdr.s_shdr64.sh_offset; sh_size = s->s_shdr.s_shdr64.sh_size; sh_align = s->s_shdr.s_shdr64.sh_addralign; } if (sh_type == SHT_NULL) { LIBELF_SET_ERROR(SECTION, 0); return (NULL); } if ((elftype = _libelf_xlate_shtype(sh_type)) < ELF_T_FIRST || elftype > ELF_T_LAST || (sh_type != SHT_NOBITS && sh_offset + sh_size > (uint64_t) e->e_rawsize)) { LIBELF_SET_ERROR(SECTION, 0); return (NULL); } if ((fsz = (elfclass == ELFCLASS32 ? elf32_fsize : elf64_fsize) (elftype, (size_t) 1, e->e_version)) == 0) { LIBELF_SET_ERROR(UNIMPL, 0); return (NULL); } if (sh_size % fsz) { LIBELF_SET_ERROR(SECTION, 0); return (NULL); } if (sh_size / fsz > SIZE_MAX) { LIBELF_SET_ERROR(RANGE, 0); return (NULL); } count = (size_t) (sh_size / fsz); msz = _libelf_msize(elftype, elfclass, e->e_version); if (count > 0 && msz > SIZE_MAX / count) { LIBELF_SET_ERROR(RANGE, 0); return (NULL); } assert(msz > 0); assert(count <= SIZE_MAX); assert(msz * count <= SIZE_MAX); if ((d = _libelf_allocate_data(s)) == NULL) return (NULL); d->d_data.d_buf = NULL; d->d_data.d_off = 0; d->d_data.d_align = sh_align; d->d_data.d_size = msz * count; d->d_data.d_type = elftype; d->d_data.d_version = e->e_version; if (sh_type == SHT_NOBITS || sh_size == 0) { STAILQ_INSERT_TAIL(&s->s_data, d, d_next); return (&d->d_data); } if ((d->d_data.d_buf = malloc(msz * count)) == NULL) { (void) _libelf_release_data(d); LIBELF_SET_ERROR(RESOURCE, 0); return (NULL); } d->d_flags |= LIBELF_F_DATA_MALLOCED; xlate = _libelf_get_translator(elftype, ELF_TOMEMORY, elfclass); if (!(*xlate)(d->d_data.d_buf, (size_t) d->d_data.d_size, e->e_rawfile + sh_offset, count, e->e_byteorder != LIBELF_PRIVATE(byteorder))) { _libelf_release_data(d); LIBELF_SET_ERROR(DATA, 0); return (NULL); } STAILQ_INSERT_TAIL(&s->s_data, d, d_next); return (&d->d_data); }
GElf_Rela * gelf_getrela(Elf_Data *ed, int ndx, GElf_Rela *dst) { int ec; Elf *e; size_t msz; Elf_Scn *scn; uint32_t sh_type; Elf32_Rela *rela32; Elf64_Rela *rela64; struct _Libelf_Data *d; d = (struct _Libelf_Data *) ed; if (d == NULL || ndx < 0 || dst == NULL || (scn = d->d_scn) == NULL || (e = scn->s_elf) == NULL) { LIBELF_SET_ERROR(ARGUMENT, 0); return (NULL); } ec = e->e_class; assert(ec == ELFCLASS32 || ec == ELFCLASS64); if (ec == ELFCLASS32) sh_type = scn->s_shdr.s_shdr32.sh_type; else sh_type = scn->s_shdr.s_shdr64.sh_type; if (_libelf_xlate_shtype(sh_type) != ELF_T_RELA) { LIBELF_SET_ERROR(ARGUMENT, 0); return (NULL); } msz = _libelf_msize(ELF_T_RELA, ec, e->e_version); assert(msz > 0); assert(ndx >= 0); if (msz * (size_t) ndx >= d->d_data.d_size) { LIBELF_SET_ERROR(ARGUMENT, 0); return (NULL); } if (ec == ELFCLASS32) { rela32 = (Elf32_Rela *) d->d_data.d_buf + ndx; dst->r_offset = (Elf64_Addr) rela32->r_offset; dst->r_info = ELF64_R_INFO( (Elf64_Xword) ELF32_R_SYM(rela32->r_info), ELF32_R_TYPE(rela32->r_info)); dst->r_addend = (Elf64_Sxword) rela32->r_addend; } else { rela64 = (Elf64_Rela *) d->d_data.d_buf + ndx; *dst = *rela64; } return (dst); }
Elf_Data * elf_getdata(Elf_Scn *s, Elf_Data *d) { Elf *e; char *dst; size_t fsz, msz, count; int elfclass, elftype; unsigned int sh_type; uint64_t sh_align, sh_offset, sh_size; void (*xlate)(char *_d, char *_s, size_t _c, int _swap); if (s == NULL || (e = s->s_elf) == NULL || e->e_kind != ELF_K_ELF || (d != NULL && s != d->d_scn)) { LIBELF_SET_ERROR(ARGUMENT, 0); return (NULL); } if (d == NULL && (d = STAILQ_FIRST(&s->s_data)) != NULL) return (d); if (d != NULL) return (STAILQ_NEXT(d, d_next)); if (e->e_rawfile == NULL) { LIBELF_SET_ERROR(SEQUENCE, 0); return (NULL); } elfclass = e->e_class; assert(elfclass == ELFCLASS32 || elfclass == ELFCLASS64); if (elfclass == ELFCLASS32) { sh_type = s->s_shdr.s_shdr32.sh_type; sh_offset = (uint64_t) s->s_shdr.s_shdr32.sh_offset; sh_size = (uint64_t) s->s_shdr.s_shdr32.sh_size; sh_align = (uint64_t) s->s_shdr.s_shdr32.sh_addralign; } else { sh_type = s->s_shdr.s_shdr64.sh_type; sh_offset = s->s_shdr.s_shdr64.sh_offset; sh_size = s->s_shdr.s_shdr64.sh_size; sh_align = s->s_shdr.s_shdr64.sh_addralign; } if ((elftype = _libelf_xlate_shtype(sh_type)) < ELF_T_FIRST || elftype > ELF_T_LAST || sh_offset + sh_size > (uint64_t) e->e_rawsize) { LIBELF_SET_ERROR(SECTION, 0); return (NULL); } if ((fsz = (elfclass == ELFCLASS32 ? elf32_fsize : elf64_fsize)(elftype, (size_t) 1, e->e_version)) == 0) { LIBELF_SET_ERROR(UNIMPL, 0); return (NULL); } if (sh_size % fsz) { LIBELF_SET_ERROR(SECTION, 0); return (NULL); } count = sh_size / fsz; msz = _libelf_msize(elftype, elfclass, e->e_version); assert(msz > 0); if ((dst = malloc(msz*count)) == NULL) { LIBELF_SET_ERROR(RESOURCE, 0); return (NULL); } if ((d = _libelf_allocate_data(s)) == NULL) return (NULL); d->d_buf = dst; d->d_off = 0; d->d_align = sh_align; d->d_size = msz * count; d->d_type = elftype; d->d_version = e->e_version; d->d_flags |= LIBELF_F_MALLOCED; STAILQ_INSERT_TAIL(&s->s_data, d, d_next); xlate = _libelf_get_translator(elftype, ELF_TOMEMORY, elfclass); (*xlate)(d->d_buf, e->e_rawfile + sh_offset, count, e->e_byteorder != LIBELF_PRIVATE(byteorder)); return (d); }
GElf_Sym * gelf_getsym(Elf_Data *ed, int ndx, GElf_Sym *dst) { int ec; Elf *e; size_t msz; Elf_Scn *scn; uint32_t sh_type; Elf32_Sym *sym32; Elf64_Sym *sym64; struct _Libelf_Data *d; d = (struct _Libelf_Data *) ed; if (d == NULL || ndx < 0 || dst == NULL || (scn = d->d_scn) == NULL || (e = scn->s_elf) == NULL) { LIBELF_SET_ERROR(ARGUMENT, 0); return (NULL); } ec = e->e_class; assert(ec == ELFCLASS32 || ec == ELFCLASS64); if (ec == ELFCLASS32) sh_type = scn->s_shdr.s_shdr32.sh_type; else sh_type = scn->s_shdr.s_shdr64.sh_type; if (_libelf_xlate_shtype(sh_type) != ELF_T_SYM) { LIBELF_SET_ERROR(ARGUMENT, 0); return (NULL); } msz = _libelf_msize(ELF_T_SYM, ec, e->e_version); assert(msz > 0); if (msz * ndx >= d->d_data.d_size) { LIBELF_SET_ERROR(ARGUMENT, 0); return (NULL); } if (ec == ELFCLASS32) { sym32 = (Elf32_Sym *) d->d_data.d_buf + ndx; dst->st_name = sym32->st_name; dst->st_value = (Elf64_Addr) sym32->st_value; dst->st_size = (Elf64_Xword) sym32->st_size; dst->st_info = ELF64_ST_INFO(ELF32_ST_BIND(sym32->st_info), ELF32_ST_TYPE(sym32->st_info)); dst->st_other = sym32->st_other; dst->st_shndx = sym32->st_shndx; } else { sym64 = (Elf64_Sym *) d->d_data.d_buf + ndx; *dst = *sym64; } return (dst); }