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freebsd-dev/contrib/elftoolchain/libpe/libpe_dos.c
Ed Maste 839529caa9 Update ELF Tool Chain to upstream rev 3400 
Some notable improvements include:

readelf:
- Add AArch64 relocation definitions.
- Report value of unknown relocation types.

elfcopy:
- Consider symbols with STB_GNU_UNIQUE binding as global symbols.
- Fixed support for VMA adjustment for loadable sections found
  in relocatable objects.
- Handle nameless global symbols.
- Improve wildcard matching for !-prefixed symbols.
- Add PE/COFF support.

elfdump:
- Improve section type reporting.
- Add MIPS-specific section types.

This update also includes a significant number of bug fixes.

PR:		207091 [exp-run]
Sponsored by:	The FreeBSD Foundation
2016-02-12 20:54:02 +00:00

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/*-
* Copyright (c) 2015 Kai Wang
* 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/param.h>
#include <sys/types.h>
#include <assert.h>
#include <errno.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include "_libpe.h"
ELFTC_VCSID("$Id: libpe_dos.c 3312 2016-01-10 09:23:51Z kaiwang27 $");
int
libpe_parse_msdos_header(PE *pe, char *hdr)
{
PE_DosHdr *dh;
char coff[sizeof(PE_CoffHdr)];
uint32_t pe_magic;
int i;
if ((pe->pe_stub = malloc(sizeof(PE_DosHdr))) == NULL) {
errno = ENOMEM;
return (-1);
}
memcpy(pe->pe_stub, hdr, sizeof(PE_DosHdr));
if ((dh = malloc(sizeof(*dh))) == NULL) {
errno = ENOMEM;
return (-1);
}
pe->pe_dh = dh;
/* Read the conventional MS-DOS EXE header. */
memcpy(dh->dh_magic, hdr, 2);
hdr += 2;
PE_READ16(hdr, dh->dh_lastsize);
PE_READ16(hdr, dh->dh_nblock);
PE_READ16(hdr, dh->dh_nreloc);
PE_READ16(hdr, dh->dh_hdrsize);
PE_READ16(hdr, dh->dh_minalloc);
PE_READ16(hdr, dh->dh_maxalloc);
PE_READ16(hdr, dh->dh_ss);
PE_READ16(hdr, dh->dh_sp);
PE_READ16(hdr, dh->dh_checksum);
PE_READ16(hdr, dh->dh_ip);
PE_READ16(hdr, dh->dh_cs);
PE_READ16(hdr, dh->dh_relocpos);
PE_READ16(hdr, dh->dh_noverlay);
/* Do not continue if the EXE is not a PE/NE/... (new executable) */
if (dh->dh_relocpos != 0x40) {
pe->pe_flags |= LIBPE_F_BAD_DOS_HEADER;
return (0);
}
for (i = 0; i < 4; i++)
PE_READ16(hdr, dh->dh_reserved1[i]);
PE_READ16(hdr, dh->dh_oemid);
PE_READ16(hdr, dh->dh_oeminfo);
for (i = 0; i < 10; i++)
PE_READ16(hdr, dh->dh_reserved2[i]);
PE_READ32(hdr, dh->dh_lfanew);
/* Check if the e_lfanew pointer is valid. */
if (dh->dh_lfanew > pe->pe_fsize - 4) {
pe->pe_flags |= LIBPE_F_BAD_DOS_HEADER;
return (0);
}
if (dh->dh_lfanew < sizeof(PE_DosHdr) &&
(pe->pe_flags & LIBPE_F_SPECIAL_FILE)) {
pe->pe_flags |= LIBPE_F_BAD_DOS_HEADER;
return (0);
}
if (dh->dh_lfanew > sizeof(PE_DosHdr)) {
pe->pe_stub_ex = dh->dh_lfanew - sizeof(PE_DosHdr);
if (pe->pe_flags & LIBPE_F_SPECIAL_FILE) {
/* Read in DOS stub now. */
if (libpe_read_msdos_stub(pe) < 0) {
pe->pe_flags |= LIBPE_F_BAD_DOS_HEADER;
return (0);
}
}
}
if ((pe->pe_flags & LIBPE_F_SPECIAL_FILE) == 0) {
/* Jump to the PE header. */
if (lseek(pe->pe_fd, (off_t) dh->dh_lfanew, SEEK_SET) < 0) {
pe->pe_flags |= LIBPE_F_BAD_PE_HEADER;
return (0);
}
}
if (read(pe->pe_fd, &pe_magic, 4) != 4 ||
htole32(pe_magic) != PE_SIGNATURE) {
pe->pe_flags |= LIBPE_F_BAD_PE_HEADER;
return (0);
}
if (read(pe->pe_fd, coff, sizeof(coff)) != (ssize_t) sizeof(coff)) {
pe->pe_flags |= LIBPE_F_BAD_COFF_HEADER;
return (0);
}
return (libpe_parse_coff_header(pe, coff));
}
int
libpe_read_msdos_stub(PE *pe)
{
void *m;
assert(pe->pe_stub_ex > 0 &&
(pe->pe_flags & LIBPE_F_LOAD_DOS_STUB) == 0);
if ((pe->pe_flags & LIBPE_F_SPECIAL_FILE) == 0) {
if (lseek(pe->pe_fd, (off_t) sizeof(PE_DosHdr), SEEK_SET) <
0) {
errno = EIO;
goto fail;
}
}
if ((m = realloc(pe->pe_stub, sizeof(PE_DosHdr) + pe->pe_stub_ex)) ==
NULL) {
errno = ENOMEM;
goto fail;
}
pe->pe_stub = m;
if (read(pe->pe_fd, pe->pe_stub + sizeof(PE_DosHdr), pe->pe_stub_ex) !=
(ssize_t) pe->pe_stub_ex) {
errno = EIO;
goto fail;
}
pe->pe_flags |= LIBPE_F_LOAD_DOS_STUB;
/* Search for the Rich header embedded just before the PE header. */
(void) libpe_parse_rich_header(pe);
return (0);
fail:
pe->pe_stub_ex = 0;
return (-1);
}
/*
* The "standard" MS-DOS stub displaying "This program cannot be run in
* DOS mode".
*/
static const char msdos_stub[] = {
'\x0e','\x1f','\xba','\x0e','\x00','\xb4','\x09','\xcd',
'\x21','\xb8','\x01','\x4c','\xcd','\x21','\x54','\x68',
'\x69','\x73','\x20','\x70','\x72','\x6f','\x67','\x72',
'\x61','\x6d','\x20','\x63','\x61','\x6e','\x6e','\x6f',
'\x74','\x20','\x62','\x65','\x20','\x72','\x75','\x6e',
'\x20','\x69','\x6e','\x20','\x44','\x4f','\x53','\x20',
'\x6d','\x6f','\x64','\x65','\x2e','\x0d','\x0d','\x0a',
'\x24','\x00','\x00','\x00','\x00','\x00','\x00','\x00',
};
static void
init_dos_header(PE_DosHdr *dh)
{
dh->dh_magic[0] = 'M';
dh->dh_magic[1] = 'Z';
dh->dh_lastsize = 144;
dh->dh_nblock = 3;
dh->dh_hdrsize = 4;
dh->dh_maxalloc = 65535;
dh->dh_sp = 184;
dh->dh_relocpos = 0x40;
dh->dh_lfanew = 0x80;
}
off_t
libpe_write_msdos_stub(PE *pe, off_t off)
{
PE_DosHdr *dh;
char tmp[sizeof(PE_DosHdr)], *hdr;
off_t d;
int i, strip_rich;
strip_rich = 0;
if (pe->pe_cmd == PE_C_RDWR) {
assert((pe->pe_flags & LIBPE_F_SPECIAL_FILE) == 0);
if (pe->pe_dh != NULL &&
(pe->pe_flags & PE_F_STRIP_DOS_STUB)) {
/*
* If we strip MS-DOS stub, everything after it
* needs rewritten.
*/
pe->pe_flags |= LIBPE_F_BAD_PE_HEADER;
goto done;
}
/*
* lseek(2) to the PE signature if MS-DOS stub is not
* modified.
*/
if (pe->pe_dh != NULL &&
(pe->pe_flags & LIBPE_F_DIRTY_DOS_HEADER) == 0 &&
(pe->pe_flags & LIBPE_F_BAD_DOS_HEADER) == 0 &&
(pe->pe_flags & PE_F_STRIP_RICH_HEADER) == 0) {
if (lseek(pe->pe_fd,
(off_t) (sizeof(PE_DosHdr) + pe->pe_stub_ex),
SEEK_CUR) < 0) {
errno = EIO;
return (-1);
}
off = sizeof(PE_DosHdr) + pe->pe_stub_ex;
goto done;
}
/* Check if we should strip the Rich header. */
if (pe->pe_dh != NULL && pe->pe_stub_app == NULL &&
(pe->pe_flags & LIBPE_F_BAD_DOS_HEADER) == 0 &&
(pe->pe_flags & PE_F_STRIP_RICH_HEADER)) {
if ((pe->pe_flags & LIBPE_F_LOAD_DOS_STUB) == 0) {
(void) libpe_read_msdos_stub(pe);
if (lseek(pe->pe_fd, off, SEEK_SET) < 0) {
errno = EIO;
return (-1);
}
}
if (pe->pe_rh != NULL) {
strip_rich = 1;
pe->pe_flags |= LIBPE_F_DIRTY_DOS_HEADER;
}
}
/*
* If length of MS-DOS stub will change, Mark the PE
* signature is broken so that the PE signature and the
* headers follow it will be rewritten.
*
* The sections should be loaded now since the stub might
* overwrite the section data.
*/
if ((pe->pe_flags & LIBPE_F_BAD_DOS_HEADER) ||
(pe->pe_stub_app != NULL && pe->pe_stub_app_sz !=
sizeof(PE_DosHdr) + pe->pe_stub_ex) || strip_rich) {
if (libpe_load_all_sections(pe) < 0)
return (-1);
if (lseek(pe->pe_fd, off, SEEK_SET) < 0) {
errno = EIO;
return (-1);
}
pe->pe_flags |= LIBPE_F_BAD_PE_HEADER;
}
}
if (pe->pe_flags & PE_F_STRIP_DOS_STUB)
goto done;
/* Always use application supplied MS-DOS stub, if exists. */
if (pe->pe_stub_app != NULL && pe->pe_stub_app_sz > 0) {
if (write(pe->pe_fd, pe->pe_stub_app, pe->pe_stub_app_sz) !=
(ssize_t) pe->pe_stub_app_sz) {
errno = EIO;
return (-1);
}
off = pe->pe_stub_app_sz;
goto done;
}
/*
* Write MS-DOS header.
*/
if (pe->pe_dh == NULL) {
if ((dh = calloc(1, sizeof(PE_DosHdr))) == NULL) {
errno = ENOMEM;
return (-1);
}
pe->pe_dh = dh;
init_dos_header(dh);
pe->pe_flags |= LIBPE_F_DIRTY_DOS_HEADER;
} else
dh = pe->pe_dh;
if (pe->pe_flags & LIBPE_F_BAD_DOS_HEADER)
init_dos_header(dh);
if (strip_rich) {
d = pe->pe_rh_start - pe->pe_stub;
dh->dh_lfanew = roundup(d, 8);
}
if ((pe->pe_flags & LIBPE_F_DIRTY_DOS_HEADER) ||
(pe->pe_flags & LIBPE_F_BAD_DOS_HEADER)) {
memcpy(tmp, dh->dh_magic, 2);
hdr = tmp + 2;
PE_WRITE16(hdr, dh->dh_lastsize);
PE_WRITE16(hdr, dh->dh_nblock);
PE_WRITE16(hdr, dh->dh_nreloc);
PE_WRITE16(hdr, dh->dh_hdrsize);
PE_WRITE16(hdr, dh->dh_minalloc);
PE_WRITE16(hdr, dh->dh_maxalloc);
PE_WRITE16(hdr, dh->dh_ss);
PE_WRITE16(hdr, dh->dh_sp);
PE_WRITE16(hdr, dh->dh_checksum);
PE_WRITE16(hdr, dh->dh_ip);
PE_WRITE16(hdr, dh->dh_cs);
PE_WRITE16(hdr, dh->dh_relocpos);
PE_WRITE16(hdr, dh->dh_noverlay);
for (i = 0; i < 4; i++)
PE_WRITE16(hdr, dh->dh_reserved1[i]);
PE_WRITE16(hdr, dh->dh_oemid);
PE_WRITE16(hdr, dh->dh_oeminfo);
for (i = 0; i < 10; i++)
PE_WRITE16(hdr, dh->dh_reserved2[i]);
PE_WRITE32(hdr, dh->dh_lfanew);
if (write(pe->pe_fd, tmp, sizeof(tmp)) !=
(ssize_t) sizeof(tmp)) {
errno = EIO;
return (-1);
}
} else {
assert((pe->pe_flags & LIBPE_F_SPECIAL_FILE) == 0);
if (lseek(pe->pe_fd, (off_t) sizeof(PE_DosHdr), SEEK_CUR) <
0) {
errno = EIO;
return (-1);
}
}
off = sizeof(PE_DosHdr);
/*
* Write the MS-DOS stub.
*/
if (strip_rich) {
assert((pe->pe_flags & LIBPE_F_SPECIAL_FILE) == 0);
assert(pe->pe_stub != NULL && pe->pe_rh_start != NULL);
d = pe->pe_rh_start - pe->pe_stub;
if (lseek(pe->pe_fd, d, SEEK_SET) < 0) {
errno = EIO;
return (-1);
}
off = d;
goto done;
}
if (pe->pe_cmd == PE_C_RDWR) {
if (lseek(pe->pe_fd, (off_t) pe->pe_stub_ex, SEEK_CUR) < 0) {
errno = EIO;
return (-1);
}
off += pe->pe_stub_ex;
goto done;
}
if (write(pe->pe_fd, msdos_stub, sizeof(msdos_stub)) !=
(ssize_t) sizeof(msdos_stub)) {
errno = EIO;
return (-1);
}
off += sizeof(msdos_stub);
done:
pe->pe_flags &= ~LIBPE_F_DIRTY_DOS_HEADER;
pe->pe_flags &= ~LIBPE_F_BAD_DOS_HEADER;
return (off);
}
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