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/* Decompression support for libdwfl: zlib (gzip), bzlib (bzip2) or lzma (xz).
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Copyright (C) 2009, 2016 Red Hat, Inc.
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This file is part of elfutils.
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This file is free software; you can redistribute it and/or modify
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it under the terms of either
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* the GNU Lesser General Public License as published by the Free
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Software Foundation; either version 3 of the License, or (at
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your option) any later version
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or
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* the GNU General Public License as published by the Free
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Software Foundation; either version 2 of the License, or (at
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your option) any later version
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or both in parallel, as here.
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elfutils is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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You should have received copies of the GNU General Public License and
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the GNU Lesser General Public License along with this program. If
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not, see <http://www.gnu.org/licenses/>. */
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#ifdef HAVE_CONFIG_H
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# include <config.h>
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#endif
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#include "../libelf/libelfP.h"
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#undef _
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#include "libdwflP.h"
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#include <unistd.h>
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#if !USE_BZLIB
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# define __libdw_bunzip2(...) DWFL_E_BADELF
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#endif
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#if !USE_LZMA
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# define __libdw_unlzma(...) DWFL_E_BADELF
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#endif
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#if !USE_ZSTD
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# define __libdw_unzstd(...) DWFL_E_BADELF
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#endif
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/* Consumes and replaces *ELF only on success. */
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static Dwfl_Error
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decompress (int fd __attribute__ ((unused)), Elf **elf)
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{
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Dwfl_Error error = DWFL_E_BADELF;
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void *buffer = NULL;
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size_t size = 0;
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const off_t offset = (*elf)->start_offset;
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void *const mapped = ((*elf)->map_address == NULL ? NULL
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: (*elf)->map_address + offset);
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const size_t mapped_size = (*elf)->maximum_size;
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if (mapped_size == 0)
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return error;
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error = __libdw_gunzip (fd, offset, mapped, mapped_size, &buffer, &size);
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if (error == DWFL_E_BADELF)
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error = __libdw_bunzip2 (fd, offset, mapped, mapped_size, &buffer, &size);
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if (error == DWFL_E_BADELF)
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error = __libdw_unlzma (fd, offset, mapped, mapped_size, &buffer, &size);
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if (error == DWFL_E_BADELF)
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error = __libdw_unzstd (fd, offset, mapped, mapped_size, &buffer, &size);
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if (error == DWFL_E_NOERROR)
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{
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if (unlikely (size == 0))
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{
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error = DWFL_E_BADELF;
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free (buffer);
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}
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else
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{
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Elf *memelf = elf_memory (buffer, size);
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if (memelf == NULL)
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{
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error = DWFL_E_LIBELF;
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free (buffer);
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}
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else
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{
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memelf->flags |= ELF_F_MALLOCED;
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elf_end (*elf);
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*elf = memelf;
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}
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}
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}
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else
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free (buffer);
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return error;
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}
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static Dwfl_Error
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what_kind (int fd, Elf **elfp, Elf_Kind *kind, bool *may_close_fd)
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{
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Dwfl_Error error = DWFL_E_NOERROR;
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*kind = elf_kind (*elfp);
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if (unlikely (*kind == ELF_K_NONE))
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{
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if (unlikely (*elfp == NULL))
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error = DWFL_E_LIBELF;
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else
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{
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error = decompress (fd, elfp);
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if (error == DWFL_E_NOERROR)
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{
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*may_close_fd = true;
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*kind = elf_kind (*elfp);
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}
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}
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}
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return error;
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}
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static Dwfl_Error
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libdw_open_elf (int *fdp, Elf **elfp, bool close_on_fail, bool archive_ok,
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bool never_close_fd, bool bad_elf_ok)
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{
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bool may_close_fd = false;
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Elf *elf = elf_begin (*fdp, ELF_C_READ_MMAP_PRIVATE, NULL);
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Elf_Kind kind;
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Dwfl_Error error = what_kind (*fdp, &elf, &kind, &may_close_fd);
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if (error == DWFL_E_BADELF)
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{
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/* It's not an ELF file or a compressed file.
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See if it's an image with a header preceding the real file. */
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off_t offset = elf->start_offset;
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error = __libdw_image_header (*fdp, &offset,
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(elf->map_address == NULL ? NULL
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: elf->map_address + offset),
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elf->maximum_size);
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if (error == DWFL_E_NOERROR)
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{
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/* Pure evil. libelf needs some better interfaces. */
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elf->kind = ELF_K_AR;
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elf->state.ar.elf_ar_hdr.ar_name = "libdwfl is faking you out";
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elf->state.ar.elf_ar_hdr.ar_size = elf->maximum_size - offset;
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elf->state.ar.offset = offset - sizeof (struct ar_hdr);
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Elf *subelf = elf_begin (-1, ELF_C_READ_MMAP_PRIVATE, elf);
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elf->kind = ELF_K_NONE;
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if (unlikely (subelf == NULL))
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error = DWFL_E_LIBELF;
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else
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{
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subelf->parent = NULL;
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subelf->flags |= elf->flags & (ELF_F_MMAPPED | ELF_F_MALLOCED);
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elf->flags &= ~(ELF_F_MMAPPED | ELF_F_MALLOCED);
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elf_end (elf);
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elf = subelf;
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error = what_kind (*fdp, &elf, &kind, &may_close_fd);
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}
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}
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}
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if (error == DWFL_E_NOERROR
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&& kind != ELF_K_ELF
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&& !(archive_ok && kind == ELF_K_AR))
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error = DWFL_E_BADELF;
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/* This basically means, we keep a ELF_K_NONE Elf handle and return it. */
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if (bad_elf_ok && error == DWFL_E_BADELF)
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error = DWFL_E_NOERROR;
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if (error != DWFL_E_NOERROR)
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{
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elf_end (elf);
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elf = NULL;
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}
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if (! never_close_fd
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&& error == DWFL_E_NOERROR ? may_close_fd : close_on_fail)
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{
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close (*fdp);
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*fdp = -1;
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}
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*elfp = elf;
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return error;
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}
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Dwfl_Error internal_function
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__libdw_open_file (int *fdp, Elf **elfp, bool close_on_fail, bool archive_ok)
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{
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return libdw_open_elf (fdp, elfp, close_on_fail, archive_ok, false, false);
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}
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Dwfl_Error internal_function
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__libdw_open_elf (int fd, Elf **elfp)
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{
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return libdw_open_elf (&fd, elfp, false, true, true, true);
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}
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