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/* Free resources associated with Elf descriptor.
Copyright (C) 1998,1999,2000,2001,2002,2004,2005,2007 Red Hat, Inc.
This file is part of Red Hat elfutils.
Written by Ulrich Drepper <>, 1998.
Red Hat elfutils is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by the
Free Software Foundation; version 2 of the License.
Red Hat elfutils is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
General Public License for more details.
You should have received a copy of the GNU General Public License along
with Red Hat elfutils; if not, write to the Free Software Foundation,
Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301 USA.
In addition, as a special exception, Red Hat, Inc. gives You the
additional right to link the code of Red Hat elfutils with code licensed
under any Open Source Initiative certified open source license
( which requires the
distribution of source code with any binary distribution and to
distribute linked combinations of the two. Non-GPL Code permitted under
this exception must only link to the code of Red Hat elfutils through
those well defined interfaces identified in the file named EXCEPTION
found in the source code files (the "Approved Interfaces"). The files
of Non-GPL Code may instantiate templates or use macros or inline
functions from the Approved Interfaces without causing the resulting
work to be covered by the GNU General Public License. Only Red Hat,
Inc. may make changes or additions to the list of Approved Interfaces.
Red Hat's grant of this exception is conditioned upon your not adding
any new exceptions. If you wish to add a new Approved Interface or
exception, please contact Red Hat. You must obey the GNU General Public
License in all respects for all of the Red Hat elfutils code and other
code used in conjunction with Red Hat elfutils except the Non-GPL Code
covered by this exception. If you modify this file, you may extend this
exception to your version of the file, but you are not obligated to do
so. If you do not wish to provide this exception without modification,
you must delete this exception statement from your version and license
this file solely under the GPL without exception.
Red Hat elfutils is an included package of the Open Invention Network.
An included package of the Open Invention Network is a package for which
Open Invention Network licensees cross-license their patents. No patent
license is granted, either expressly or impliedly, by designation as an
included package. Should you wish to participate in the Open Invention
Network licensing program, please visit
<>. */
# include <config.h>
#include <assert.h>
#include <stddef.h>
#include <stdlib.h>
#include <sys/mman.h>
#include "libelfP.h"
elf_end (elf)
Elf *elf;
Elf *parent;
if (elf == NULL)
/* This is allowed and is a no-op. */
return 0;
/* Make sure we are alone. */
rwlock_wrlock (elf->lock);
if (elf->ref_count != 0 && --elf->ref_count != 0)
/* Not yet the last activation. */
int result = elf->ref_count;
rwlock_unlock (elf->lock);
return result;
if (elf->kind == ELF_K_AR)
/* We cannot remove the descriptor now since we still have some
descriptors which depend on it. But we can free the archive
symbol table since this is only available via the archive ELF
descriptor. The long name table cannot be freed yet since
the archive headers for the ELF files in the archive point
into this array. */
if (elf-> != (Elf_Arsym *) -1l)
free (elf->;
elf-> = NULL;
if (elf-> != NULL)
return 0;
/* Remove this structure from the children list. */
parent = elf->parent;
if (parent != NULL)
/* This is tricky. Lock must be acquire from the father to
the child but here we already have the child lock. We
solve this problem by giving free the child lock. The
state of REF_COUNT==0 is handled all over the library, so
this should be ok. */
rwlock_unlock (elf->lock);
rwlock_rdlock (parent->lock);
rwlock_wrlock (elf->lock);
if (parent-> == elf)
parent-> = elf->next;
struct Elf *child = parent->;
while (child->next != elf)
child = child->next;
child->next = elf->next;
rwlock_unlock (parent->lock);
/* This was the last activation. Free all resources. */
switch (elf->kind)
case ELF_K_AR:
if (elf-> != NULL)
free (elf->;
case ELF_K_ELF:
Elf_Data_Chunk *rawchunks
= (elf->class == ELFCLASS32
|| (offsetof (struct Elf, state.elf32.rawchunks)
== offsetof (struct Elf, state.elf64.rawchunks))
? elf->state.elf32.rawchunks
: elf->state.elf64.rawchunks);
while (rawchunks != NULL)
Elf_Data_Chunk *next = rawchunks->next;
if (rawchunks->dummy_scn.flags & ELF_F_MALLOCED)
free (rawchunks->data.d.d_buf);
free (rawchunks);
rawchunks = next;
Elf_ScnList *list = (elf->class == ELFCLASS32
|| (offsetof (struct Elf, state.elf32.scns)
== offsetof (struct Elf, state.elf64.scns))
? &elf->state.elf32.scns
: &elf->state.elf64.scns);
/* Free all separately allocated section headers. */
size_t cnt = list->max;
while (cnt-- > 0)
/* These pointers can be NULL; it's safe to use
'free' since it will check for this. */
Elf_Scn *scn = &list->data[cnt];
Elf_Data_List *runp;
if ((scn->shdr_flags & ELF_F_MALLOCED) != 0)
/* It doesn't matter which pointer. */
free (scn->shdr.e32);
/* If the file has the same byte order and the
architecture doesn't require overly stringent
alignment the raw data buffer is the same as the
one used for presenting to the caller. */
if (scn->data_base != scn->rawdata_base)
free (scn->data_base);
/* The section data is allocated if we couldn't mmap
the file. */
if (elf->map_address == NULL)
free (scn->rawdata_base);
/* Free the list of data buffers for the section.
We don't free the buffers themselves since this
is the users job. */
runp = scn->;
while (runp != NULL)
Elf_Data_List *oldp = runp;
runp = runp->next;
if ((oldp->flags & ELF_F_MALLOCED) != 0)
free (oldp);
/* Free the memory for the array. */
Elf_ScnList *oldp = list;
list = list->next;
assert (list == NULL || oldp->cnt == oldp->max);
if (oldp != (elf->class == ELFCLASS32
|| (offsetof (struct Elf, state.elf32.scns)
== offsetof (struct Elf, state.elf64.scns))
? &elf->state.elf32.scns
: &elf->state.elf64.scns))
free (oldp);
while (list != NULL);
/* Free the section header. */
if (elf->state.elf.shdr_malloced != 0)
free (elf->class == ELFCLASS32
|| (offsetof (struct Elf, state.elf32.shdr)
== offsetof (struct Elf, state.elf64.shdr))
? (void *) elf->state.elf32.shdr
: (void *) elf->state.elf64.shdr);
/* Free the program header. */
if ((elf->state.elf.phdr_flags & ELF_F_MALLOCED) != 0)
free (elf->class == ELFCLASS32
|| (offsetof (struct Elf, state.elf32.phdr)
== offsetof (struct Elf, state.elf64.phdr))
? (void *) elf->state.elf32.phdr
: (void *) elf->state.elf64.phdr);
if (elf->map_address != NULL && parent == NULL)
/* The file was read or mapped for this descriptor. */
if ((elf->flags & ELF_F_MALLOCED) != 0)
free (elf->map_address);
else if ((elf->flags & ELF_F_MMAPPED) != 0)
munmap (elf->map_address, elf->maximum_size);
rwlock_fini (elf->lock);
/* Finally the descriptor itself. */
free (elf);
return (parent != NULL && parent->ref_count == 0
? INTUSE(elf_end) (parent) : 0);