mirror of
https://git.FreeBSD.org/src.git
synced 2024-12-23 11:18:54 +00:00
f6c0f35e07
members of the ELF Executable Header inside the library-private
`struct _Elf' descriptor and only update the underlying Elf{32,64}_Ehdr
structure on an elf_update(3) call. These fields of the Ehdr
structure are technically `out of bounds' for an application program
per the ELF(3) API, but we've seen applications that initialize
a new Ehdr structure using memcpy(), messing up the library's
invariants. [1]
Implement elf_getphnum() and handle ELF objects with more than
64K program header table entries.
Reported by: jb [1]
137 lines
3.2 KiB
C
137 lines
3.2 KiB
C
/*-
|
|
* Copyright (c) 2006 Joseph Koshy
|
|
* All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
|
|
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
|
|
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
* SUCH DAMAGE.
|
|
*/
|
|
|
|
#include <sys/cdefs.h>
|
|
__FBSDID("$FreeBSD$");
|
|
|
|
#include <assert.h>
|
|
#include <libelf.h>
|
|
|
|
#include "_libelf.h"
|
|
|
|
/*
|
|
* Retrieve section #0, allocating a new section if needed.
|
|
*/
|
|
static Elf_Scn *
|
|
_libelf_getscn0(Elf *e)
|
|
{
|
|
Elf_Scn *s;
|
|
|
|
if ((s = STAILQ_FIRST(&e->e_u.e_elf.e_scn)) != NULL)
|
|
return (s);
|
|
|
|
return (_libelf_allocate_scn(e, (size_t) SHN_UNDEF));
|
|
}
|
|
|
|
int
|
|
_libelf_setshnum(Elf *e, void *eh, int ec, size_t shnum)
|
|
{
|
|
Elf_Scn *scn;
|
|
|
|
if (shnum >= SHN_LORESERVE) {
|
|
if ((scn = _libelf_getscn0(e)) == NULL)
|
|
return (0);
|
|
|
|
assert(scn->s_ndx == SHN_UNDEF);
|
|
|
|
if (ec == ELFCLASS32)
|
|
scn->s_shdr.s_shdr32.sh_size = shnum;
|
|
else
|
|
scn->s_shdr.s_shdr64.sh_size = shnum;
|
|
|
|
(void) elf_flagshdr(scn, ELF_C_SET, ELF_F_DIRTY);
|
|
|
|
shnum = 0;
|
|
}
|
|
|
|
if (ec == ELFCLASS32)
|
|
((Elf32_Ehdr *) eh)->e_shnum = shnum;
|
|
else
|
|
((Elf64_Ehdr *) eh)->e_shnum = shnum;
|
|
|
|
|
|
return (1);
|
|
}
|
|
|
|
int
|
|
_libelf_setshstrndx(Elf *e, void *eh, int ec, size_t shstrndx)
|
|
{
|
|
Elf_Scn *scn;
|
|
|
|
if (shstrndx >= SHN_LORESERVE) {
|
|
if ((scn = _libelf_getscn0(e)) == NULL)
|
|
return (0);
|
|
|
|
assert(scn->s_ndx == SHN_UNDEF);
|
|
|
|
if (ec == ELFCLASS32)
|
|
scn->s_shdr.s_shdr32.sh_link = shstrndx;
|
|
else
|
|
scn->s_shdr.s_shdr64.sh_link = shstrndx;
|
|
|
|
(void) elf_flagshdr(scn, ELF_C_SET, ELF_F_DIRTY);
|
|
|
|
shstrndx = SHN_XINDEX;
|
|
}
|
|
|
|
if (ec == ELFCLASS32)
|
|
((Elf32_Ehdr *) eh)->e_shstrndx = shstrndx;
|
|
else
|
|
((Elf64_Ehdr *) eh)->e_shstrndx = shstrndx;
|
|
|
|
return (1);
|
|
}
|
|
|
|
int
|
|
_libelf_setphnum(Elf *e, void *eh, int ec, size_t phnum)
|
|
{
|
|
Elf_Scn *scn;
|
|
|
|
if (phnum >= PN_XNUM) {
|
|
if ((scn = _libelf_getscn0(e)) == NULL)
|
|
return (0);
|
|
|
|
assert(scn->s_ndx == SHN_UNDEF);
|
|
|
|
if (ec == ELFCLASS32)
|
|
scn->s_shdr.s_shdr32.sh_info = phnum;
|
|
else
|
|
scn->s_shdr.s_shdr64.sh_info = phnum;
|
|
|
|
(void) elf_flagshdr(scn, ELF_C_SET, ELF_F_DIRTY);
|
|
|
|
phnum = PN_XNUM;
|
|
}
|
|
|
|
if (ec == ELFCLASS32)
|
|
((Elf32_Ehdr *) eh)->e_phnum = phnum;
|
|
else
|
|
((Elf64_Ehdr *) eh)->e_phnum = phnum;
|
|
|
|
return (1);
|
|
}
|
|
|