mirror of
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.
236 lines
6.2 KiB
C
236 lines
6.2 KiB
C
/* 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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