mirror of
https://github.com/openharmony/third_party_elfutils.git
synced 2026-07-19 19:43:34 -04:00
Mark Wielaard
34534cc174
For ELF files with more than SHN_LOWRESERVE sections we always need section zero to store the section number (it doesn't just fit in the Ehdr e_shnum field). Make sure to create it if it doesn't exist yet in elf_getscn. Also fix handling on shnum in updatefile for the mmap case (we already got this correct for the non-mmap case). This adds a new test run-copymany-sections.sh which is like run-copyadd-sections.sh but tries to add two times 65535 sections. It makes sure libelf can copy the whole file and elfcmp checks they are the same. It doesn't use mmap for addsections since that doesn't work yet. ELF_C_RDWR_MMAP needs mremap which will fail since it needs too much space and the original mmap cannot move. Signed-off-by: Mark Wielaard <mark@klomp.org>
121 lines
2.9 KiB
C
121 lines
2.9 KiB
C
/* Get section at specific index.
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Copyright (C) 1998, 1999, 2000, 2001, 2002, 2004, 2015 Red Hat, Inc.
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This file is part of elfutils.
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Contributed by Ulrich Drepper <drepper@redhat.com>, 1998.
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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 <stddef.h>
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#include <stdlib.h>
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#include "libelfP.h"
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Elf_Scn *
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elf_getscn (Elf *elf, size_t idx)
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{
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if (elf == NULL)
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return NULL;
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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 NULL;
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}
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rwlock_rdlock (elf->lock);
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Elf_Scn *result = NULL;
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/* Find the section in the list. */
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Elf_ScnList *runp = (elf->class == ELFCLASS32
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|| (offsetof (struct Elf, state.elf32.scns)
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== offsetof (struct Elf, state.elf64.scns))
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? &elf->state.elf32.scns : &elf->state.elf64.scns);
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/* Section zero is special. It always exists even if there is no
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"first" section. And it is needed to store "overflow" values
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from the Elf header. */
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if (idx == 0 && runp->cnt == 0 && runp->max > 0)
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{
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Elf_Scn *scn0 = &runp->data[0];
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if (elf->class == ELFCLASS32)
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{
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scn0->shdr.e32 = (Elf32_Shdr *) calloc (1, sizeof (Elf32_Shdr));
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if (scn0->shdr.e32 == NULL)
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{
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__libelf_seterrno (ELF_E_NOMEM);
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goto out;
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}
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}
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else
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{
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scn0->shdr.e64 = (Elf64_Shdr *) calloc (1, sizeof (Elf64_Shdr));
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if (scn0->shdr.e64 == NULL)
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{
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__libelf_seterrno (ELF_E_NOMEM);
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goto out;
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}
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}
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scn0->elf = elf;
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scn0->shdr_flags = ELF_F_DIRTY | ELF_F_MALLOCED;
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scn0->list = elf->state.elf.scns_last;
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scn0->data_read = 1;
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runp->cnt = 1;
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}
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while (1)
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{
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if (idx < runp->max)
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{
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if (idx < runp->cnt)
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result = &runp->data[idx];
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else
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__libelf_seterrno (ELF_E_INVALID_INDEX);
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break;
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}
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idx -= runp->max;
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runp = runp->next;
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if (runp == NULL)
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{
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__libelf_seterrno (ELF_E_INVALID_INDEX);
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break;
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}
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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_getscn)
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