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236 lines
6.2 KiB
236 lines
6.2 KiB
/* Return section index of section header string table.
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Copyright (C) 2002, 2005, 2009, 2014, 2015 Red Hat, Inc.
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This file is part of elfutils.
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Written by Ulrich Drepper <drepper@redhat.com>, 2002.
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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 <assert.h>
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#include <errno.h>
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#include <gelf.h>
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#include <stddef.h>
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#include <unistd.h>
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#include <system.h>
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#include "libelfP.h"
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#include "common.h"
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int
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elf_getshdrstrndx (Elf *elf, size_t *dst)
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{
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int result = 0;
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if (elf == NULL)
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return -1;
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if (unlikely (elf->kind != ELF_K_ELF))
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{
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__libelf_seterrno (ELF_E_INVALID_HANDLE);
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return -1;
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}
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rwlock_rdlock (elf->lock);
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/* We rely here on the fact that the `elf' element is a common prefix
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of `elf32' and `elf64'. */
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assert (offsetof (struct Elf, state.elf.ehdr)
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== offsetof (struct Elf, state.elf32.ehdr));
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assert (sizeof (elf->state.elf.ehdr)
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== sizeof (elf->state.elf32.ehdr));
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assert (offsetof (struct Elf, state.elf.ehdr)
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== offsetof (struct Elf, state.elf64.ehdr));
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assert (sizeof (elf->state.elf.ehdr)
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== sizeof (elf->state.elf64.ehdr));
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if (unlikely (elf->state.elf.ehdr == NULL))
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{
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__libelf_seterrno (ELF_E_WRONG_ORDER_EHDR);
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result = -1;
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}
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else
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{
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Elf32_Word num;
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num = (elf->class == ELFCLASS32
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? elf->state.elf32.ehdr->e_shstrndx
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: elf->state.elf64.ehdr->e_shstrndx);
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/* Determine whether the index is too big to fit in the ELF
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header. */
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if (unlikely (num == SHN_XINDEX))
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{
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/* Yes. Search the zeroth section header. */
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if (elf->class == ELFCLASS32)
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{
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size_t offset;
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if (unlikely (elf->state.elf32.scns.cnt == 0))
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{
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/* Cannot use SHN_XINDEX without section headers. */
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__libelf_seterrno (ELF_E_INVALID_SECTION_HEADER);
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result = -1;
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goto out;
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}
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if (elf->state.elf32.scns.data[0].shdr.e32 != NULL)
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{
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num = elf->state.elf32.scns.data[0].shdr.e32->sh_link;
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goto success;
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}
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offset = elf->state.elf32.ehdr->e_shoff;
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if (elf->map_address != NULL
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&& elf->state.elf32.ehdr->e_ident[EI_DATA] == MY_ELFDATA
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&& (ALLOW_UNALIGNED
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|| (((size_t) ((char *) elf->map_address
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+ elf->start_offset + offset))
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& (__alignof__ (Elf32_Shdr) - 1)) == 0))
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{
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/* First see whether the information in the ELF header is
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valid and it does not ask for too much. */
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if (unlikely (elf->maximum_size - offset
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< sizeof (Elf32_Shdr)))
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{
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/* Something is wrong. */
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__libelf_seterrno (ELF_E_INVALID_SECTION_HEADER);
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result = -1;
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goto out;
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}
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/* We can directly access the memory. */
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num = ((Elf32_Shdr *) (elf->map_address + elf->start_offset
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+ offset))->sh_link;
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}
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else
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{
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/* We avoid reading in all the section headers. Just read
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the first one. */
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Elf32_Shdr shdr_mem;
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ssize_t r;
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if (unlikely ((r = pread_retry (elf->fildes, &shdr_mem,
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sizeof (Elf32_Shdr), offset))
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!= sizeof (Elf32_Shdr)))
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{
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/* We must be able to read this ELF section header. */
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if (r < 0)
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__libelf_seterrno (ELF_E_INVALID_FILE);
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else
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__libelf_seterrno (ELF_E_INVALID_ELF);
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result = -1;
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goto out;
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}
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if (elf->state.elf32.ehdr->e_ident[EI_DATA] != MY_ELFDATA)
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CONVERT (shdr_mem.sh_link);
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num = shdr_mem.sh_link;
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}
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}
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else
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{
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if (unlikely (elf->state.elf64.scns.cnt == 0))
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{
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/* Cannot use SHN_XINDEX without section headers. */
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__libelf_seterrno (ELF_E_INVALID_SECTION_HEADER);
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result = -1;
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goto out;
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}
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if (elf->state.elf64.scns.data[0].shdr.e64 != NULL)
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{
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num = elf->state.elf64.scns.data[0].shdr.e64->sh_link;
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goto success;
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}
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size_t offset = elf->state.elf64.ehdr->e_shoff;
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if (elf->map_address != NULL
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&& elf->state.elf64.ehdr->e_ident[EI_DATA] == MY_ELFDATA
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&& (ALLOW_UNALIGNED
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|| (((size_t) ((char *) elf->map_address
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+ elf->start_offset + offset))
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& (__alignof__ (Elf64_Shdr) - 1)) == 0))
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{
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/* First see whether the information in the ELF header is
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valid and it does not ask for too much. */
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if (unlikely (elf->maximum_size - offset
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< sizeof (Elf64_Shdr)))
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{
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/* Something is wrong. */
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__libelf_seterrno (ELF_E_INVALID_SECTION_HEADER);
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result = -1;
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goto out;
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}
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/* We can directly access the memory. */
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num = ((Elf64_Shdr *) (elf->map_address + elf->start_offset
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+ offset))->sh_link;
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}
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else
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{
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/* We avoid reading in all the section headers. Just read
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the first one. */
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Elf64_Shdr shdr_mem;
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ssize_t r;
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if (unlikely ((r = pread_retry (elf->fildes, &shdr_mem,
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sizeof (Elf64_Shdr), offset))
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!= sizeof (Elf64_Shdr)))
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{
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/* We must be able to read this ELF section header. */
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if (r < 0)
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__libelf_seterrno (ELF_E_INVALID_FILE);
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else
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__libelf_seterrno (ELF_E_INVALID_ELF);
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result = -1;
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goto out;
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}
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if (elf->state.elf64.ehdr->e_ident[EI_DATA] != MY_ELFDATA)
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CONVERT (shdr_mem.sh_link);
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num = shdr_mem.sh_link;
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}
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}
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}
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/* Store the result. */
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success:
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*dst = num;
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}
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out:
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rwlock_unlock (elf->lock);
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return result;
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}
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INTDEF(elf_getshdrstrndx)
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/* Alias for the deprecated name. */
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strong_alias (elf_getshdrstrndx, elf_getshstrndx)
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