/*- * SPDX-License-Identifier: BSD-2-Clause * * Copyright (c) 2020 The FreeBSD Foundation * * This software was developed by Tiger Gao under sponsorship from * the FreeBSD Foundation. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions are * met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in * the documentation and/or other materials provided with the distribution. * * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. */ #include <gelf.h> #include <libelf.h> #include "_libelf.h" void * _libelf_getchdr(Elf_Scn *s, int ec) { Elf *e; void *sh; Elf32_Shdr *sh32; Elf64_Shdr *sh64; sh32 = NULL; sh64 = NULL; if (s == NULL || (e = s->s_elf) == NULL || e->e_kind != ELF_K_ELF) { LIBELF_SET_ERROR(ARGUMENT, 0); return (NULL); } if (ec == ELFCLASSNONE) { ec = e->e_class; } else if (ec != e->e_class) { LIBELF_SET_ERROR(CLASS, 0); return (NULL); } if ((sh = _libelf_getshdr(s, ec)) == NULL) { LIBELF_SET_ERROR(HEADER, 0); return (NULL); } if (ec == ELFCLASS32) { sh32 = (Elf32_Shdr *)sh; if ((sh32->sh_flags & SHF_ALLOC) != 0) { LIBELF_SET_ERROR(INVALID_SECTION_FLAGS, 0); return (NULL); } if (sh32->sh_type == SHT_NULL || sh32->sh_type == SHT_NOBITS) { LIBELF_SET_ERROR(INVALID_SECTION_TYPE, 0); return (NULL); } if ((sh32->sh_flags & SHF_COMPRESSED) == 0) { LIBELF_SET_ERROR(NOT_COMPRESSED, 0); return (NULL); } } else { sh64 = (Elf64_Shdr *)sh; if ((sh64->sh_flags & SHF_ALLOC) != 0) { LIBELF_SET_ERROR(INVALID_SECTION_FLAGS, 0); return (NULL); } if (sh64->sh_type == SHT_NULL || sh64->sh_type == SHT_NOBITS) { LIBELF_SET_ERROR(INVALID_SECTION_TYPE, 0); return (NULL); } if ((sh64->sh_flags & SHF_COMPRESSED) == 0) { LIBELF_SET_ERROR(NOT_COMPRESSED, 0); return (NULL); } } Elf_Data *d = elf_getdata(s, NULL); if (!d) return (NULL); return ((void *)d->d_buf); }