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https://github.com/JakeHillion/drgn.git
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1cedca8ff4
Based on: c950e8a9 config: Fix spec file, add manpages and new GFDL license. With the following patches: configure: Add --disable-programs configure: Add --disable-shared configure: Fix -D_FORTIFY_SOURCE=2 check when CFLAGS contains -Wno-error libcpu: compile i386_lex.c with -Wno-implicit-fallthrough The plan is to stop relying on the distribution's version of elfutils and instead ship our own. This gives us freedom to assume that we're using the latest version and even ship our own patches (starting with a few build system improvements). More details are in scripts/update-elfutils.sh, which was used to generate this commit.
146 lines
3.8 KiB
C
146 lines
3.8 KiB
C
/* Update symbol information and section index in symbol table at the
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given index.
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Copyright (C) 2000, 2001, 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>, 2000.
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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 <gelf.h>
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#include <stdlib.h>
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#include <string.h>
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#include "libelfP.h"
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int
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gelf_update_symshndx (Elf_Data *symdata, Elf_Data *shndxdata, int ndx,
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GElf_Sym *src, Elf32_Word srcshndx)
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{
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Elf_Data_Scn *symdata_scn = (Elf_Data_Scn *) symdata;
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Elf_Data_Scn *shndxdata_scn = (Elf_Data_Scn *) shndxdata;
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Elf_Scn *scn;
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Elf32_Word *shndx = NULL;
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int result = 0;
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if (symdata == NULL)
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return 0;
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if (unlikely (symdata_scn->d.d_type != ELF_T_SYM))
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{
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/* The type of the data better should match. */
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__libelf_seterrno (ELF_E_DATA_MISMATCH);
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return 0;
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}
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scn = symdata_scn->s;
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/* We simply have to believe the user that the two sections belong to
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the same ELF file. */
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rwlock_wrlock (scn->elf->lock);
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/* The user is not required to pass a data descriptor for an extended
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section index table. */
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if (shndxdata_scn != NULL)
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{
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if (unlikely ((ndx + 1) * sizeof (Elf32_Word) > shndxdata_scn->d.d_size))
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{
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__libelf_seterrno (ELF_E_INVALID_INDEX);
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goto out;
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}
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shndx = &((Elf32_Word *) shndxdata_scn->d.d_buf)[ndx];
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}
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/* But if s/he does not the extended sectio index must be zero. */
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else if (unlikely (srcshndx != 0))
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{
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__libelf_seterrno (ELF_E_INVALID_INDEX);
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goto out;
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}
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if (scn->elf->class == ELFCLASS32)
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{
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Elf32_Sym *sym;
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/* There is the possibility that the values in the input are
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too large. */
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if (unlikely (src->st_value > 0xffffffffull)
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|| unlikely (src->st_size > 0xffffffffull))
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{
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__libelf_seterrno (ELF_E_INVALID_DATA);
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goto out;
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}
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/* Check whether we have to resize the data buffer. */
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if (INVALID_NDX (ndx, Elf32_Sym, &symdata_scn->d))
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{
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__libelf_seterrno (ELF_E_INVALID_INDEX);
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goto out;
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}
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sym = &((Elf32_Sym *) symdata_scn->d.d_buf)[ndx];
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#define COPY(name) \
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sym->name = src->name
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COPY (st_name);
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COPY (st_value);
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COPY (st_size);
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/* Please note that we can simply copy the `st_info' element since
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the definitions of ELFxx_ST_BIND and ELFxx_ST_TYPE are the same
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for the 64 bit variant. */
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COPY (st_info);
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COPY (st_other);
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COPY (st_shndx);
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}
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else
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{
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/* Check whether we have to resize the data buffer. */
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if (INVALID_NDX (ndx, Elf64_Sym, &symdata_scn->d))
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{
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__libelf_seterrno (ELF_E_INVALID_INDEX);
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goto out;
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}
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((Elf64_Sym *) symdata_scn->d.d_buf)[ndx] = *src;
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}
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/* Now we can store the section index. */
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if (shndx != NULL)
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*shndx = srcshndx;
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result = 1;
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/* Mark the section as modified. */
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scn->flags |= ELF_F_DIRTY;
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out:
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rwlock_unlock (scn->elf->lock);
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return result;
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}
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