1 /*-
2  * Copyright (c) 2016 Kai Wang
3  * All rights reserved.
4  *
5  * Redistribution and use in source and binary forms, with or without
6  * modification, are permitted provided that the following conditions
7  * are met:
8  * 1. Redistributions of source code must retain the above copyright
9  *    notice, this list of conditions and the following disclaimer.
10  * 2. Redistributions in binary form must reproduce the above copyright
11  *    notice, this list of conditions and the following disclaimer in the
12  *    documentation and/or other materials provided with the distribution.
13  *
14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24  * SUCH DAMAGE.
25  */
26 
27 #include <errno.h>
28 
29 #include "_libpe.h"
30 
31 ELFTC_VCSID("$Id: pe_symtab.c 3312 2016-01-10 09:23:51Z kaiwang27 $");
32 
33 int
34 pe_update_symtab(PE *pe, char *symtab, size_t sz, unsigned int nsym)
35 {
36 	PE_Scn *ps, *pstmp;
37 	PE_SecBuf *sb;
38 	PE_SecHdr *sh;
39 
40 	if (pe == NULL || symtab == NULL || sz == 0) {
41 		errno = EINVAL;
42 		return (-1);
43 	}
44 
45 	if (pe->pe_cmd == PE_C_READ || pe->pe_flags & LIBPE_F_FD_DONE) {
46 		errno = EACCES;
47 		return (-1);
48 	}
49 
50 	/* Remove the old symbol table. */
51 	STAILQ_FOREACH_SAFE(ps, &pe->pe_scn, ps_next, pstmp) {
52 		if (ps->ps_ndx == 0xFFFFFFFFU)
53 			libpe_release_scn(ps);
54 	}
55 
56 	/*
57 	 * Insert the new symbol table.
58 	 */
59 
60 	if ((ps = libpe_alloc_scn(pe)) == NULL)
61 		return (-1);
62 
63 	STAILQ_INSERT_TAIL(&pe->pe_scn, ps, ps_next);
64 	ps->ps_ndx = 0xFFFFFFFFU;
65 	ps->ps_flags |= PE_F_DIRTY;
66 
67 	/*
68 	 * Set the symbol table section offset to the maximum to make sure
69 	 * that it will be placed in the end of the file during section
70 	 * layout.
71 	 */
72 	sh = &ps->ps_sh;
73 	sh->sh_rawptr = 0xFFFFFFFFU;
74 	sh->sh_rawsize = sz;
75 
76 	/* Allocate the buffer. */
77 	if ((sb = libpe_alloc_buffer(ps, 0)) == NULL)
78 		return (-1);
79 	sb->sb_flags |= PE_F_DIRTY;
80 	sb->sb_pb.pb_size = sz;
81 	sb->sb_pb.pb_buf = symtab;
82 
83 	pe->pe_nsym = nsym;
84 
85 	return (0);
86 }
87