26d8253ac6
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
/*-
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* Copyright (c) 2006 Joseph Koshy
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <assert.h>
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#include <libelf.h>
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#include "_libelf.h"
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/*
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* Retrieve section #0, allocating a new section if needed.
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*/
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static Elf_Scn *
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_libelf_getscn0(Elf *e)
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{
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Elf_Scn *s;
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if ((s = STAILQ_FIRST(&e->e_u.e_elf.e_scn)) != NULL)
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return (s);
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return (_libelf_allocate_scn(e, (size_t) SHN_UNDEF));
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}
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int
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_libelf_setshnum(Elf *e, void *eh, int ec, size_t shnum)
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{
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Elf_Scn *scn;
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if (shnum >= SHN_LORESERVE) {
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if ((scn = _libelf_getscn0(e)) == NULL)
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return (0);
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assert(scn->s_ndx == SHN_UNDEF);
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if (ec == ELFCLASS32)
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scn->s_shdr.s_shdr32.sh_size = shnum;
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else
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scn->s_shdr.s_shdr64.sh_size = shnum;
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(void) elf_flagshdr(scn, ELF_C_SET, ELF_F_DIRTY);
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shnum = 0;
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}
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if (ec == ELFCLASS32)
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((Elf32_Ehdr *) eh)->e_shnum = shnum;
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else
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((Elf64_Ehdr *) eh)->e_shnum = shnum;
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return (1);
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}
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int
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_libelf_setshstrndx(Elf *e, void *eh, int ec, size_t shstrndx)
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{
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Elf_Scn *scn;
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if (shstrndx >= SHN_LORESERVE) {
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if ((scn = _libelf_getscn0(e)) == NULL)
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return (0);
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assert(scn->s_ndx == SHN_UNDEF);
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if (ec == ELFCLASS32)
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scn->s_shdr.s_shdr32.sh_link = shstrndx;
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else
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scn->s_shdr.s_shdr64.sh_link = shstrndx;
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(void) elf_flagshdr(scn, ELF_C_SET, ELF_F_DIRTY);
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shstrndx = SHN_XINDEX;
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}
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if (ec == ELFCLASS32)
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((Elf32_Ehdr *) eh)->e_shstrndx = shstrndx;
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else
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((Elf64_Ehdr *) eh)->e_shstrndx = shstrndx;
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return (1);
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}
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int
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_libelf_setphnum(Elf *e, void *eh, int ec, size_t phnum)
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{
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Elf_Scn *scn;
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if (phnum >= PN_XNUM) {
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if ((scn = _libelf_getscn0(e)) == NULL)
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return (0);
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assert(scn->s_ndx == SHN_UNDEF);
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if (ec == ELFCLASS32)
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scn->s_shdr.s_shdr32.sh_info = phnum;
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else
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scn->s_shdr.s_shdr64.sh_info = phnum;
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(void) elf_flagshdr(scn, ELF_C_SET, ELF_F_DIRTY);
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phnum = PN_XNUM;
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}
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if (ec == ELFCLASS32)
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((Elf32_Ehdr *) eh)->e_phnum = phnum;
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else
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((Elf64_Ehdr *) eh)->e_phnum = phnum;
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return (1);
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}
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