a6ae90983e
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
108 lines
2.8 KiB
C
108 lines
2.8 KiB
C
/*-
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* Copyright (c) 2016 Kai Wang
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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 <assert.h>
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#include <errno.h>
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#include "_libpe.h"
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ELFTC_VCSID("$Id: pe_rich.c 3312 2016-01-10 09:23:51Z kaiwang27 $");
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PE_RichHdr *
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pe_rich_header(PE *pe)
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{
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if (pe == NULL) {
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errno = EINVAL;
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return (NULL);
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}
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if (pe->pe_rh == NULL && pe->pe_stub_ex > 0 &&
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(pe->pe_flags & LIBPE_F_LOAD_DOS_STUB) == 0) {
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assert((pe->pe_flags & LIBPE_F_SPECIAL_FILE) == 0);
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(void) libpe_read_msdos_stub(pe);
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}
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if (pe->pe_rh == NULL) {
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errno = ENOENT;
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return (NULL);
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}
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return (pe->pe_rh);
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}
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static uint32_t
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rol32(uint32_t n, int c)
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{
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c &= 0x1f;
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return ((n << c) | (n >> (0x20 - c)));
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}
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int
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pe_rich_header_validate(PE *pe)
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{
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PE_RichHdr *rh;
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uint32_t cksum;
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char *p;
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int i, off;
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if (pe_rich_header(pe) == NULL)
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return (-1);
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assert(pe->pe_rh_start != NULL);
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/*
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* Initial value of the checksum is the offset to the begin of
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* the Rich header.
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*/
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cksum = pe->pe_rh_start - pe->pe_stub;
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/*
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* Add the bytes before the Rich header to the checksum, rotated
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* left by the offset.
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*/
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for (p = pe->pe_stub; p < pe->pe_rh_start; p++) {
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/* Skip dh_lfanew. */
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off = p - pe->pe_stub;
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if (off >= 0x3c && off < 0x40)
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continue;
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cksum += rol32((unsigned char) *p, off);
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}
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/* Add each compid rotated left by its count to the checksum. */
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rh = pe->pe_rh;
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for (i = 0; (uint32_t) i < rh->rh_total; i++)
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cksum += rol32(rh->rh_compid[i], rh->rh_cnt[i]);
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/* Validate the checksum with the XOR mask stored after "Rich". */
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if (cksum == rh->rh_xor)
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return (1);
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return (0);
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}
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