1 /* $OpenBSD: ksyms.c,v 1.8 2015/02/07 03:26:20 tedu Exp $ */
4 * Copyright (c) 2008 Miodrag Vallat.
6 * Permission to use, copy, modify, and distribute this software for any
7 * purpose with or without fee is hereby granted, provided that the above
8 * copyright notice and this permission notice appear in all copies.
10 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
11 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
12 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
13 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
14 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
15 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
16 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
26 #include <sys/elf64.h>
30 typedef Elf64_Ehdr Elf_Ehdr;
31 typedef Elf64_Shdr Elf_Shdr;
33 static int ksyms_elf_parse(void);
41 char symbuf[1 + BUFSIZ], *sym, *end;
44 for (tries = 0; tries < MAXBADWORDS; tries++) {
45 pos = arc4random_uniform(symsize);
46 if (lseek(symfd, pos + symoffs, SEEK_SET) == -1)
48 buflen = read(symfd, symbuf, BUFSIZ);
53 * The buffer is hopefully large enough to hold at least
54 * a complete symbol, i.e. two occurences of NUL, or
55 * one occurence of NUL and the buffer containing the end
56 * of the string table. We make sure the buffer will be
57 * NUL terminated in all cases.
59 if (buflen + pos >= symsize)
60 buflen = symsize - pos;
61 *(end = symbuf + buflen) = '\0';
63 for (sym = symbuf; *sym != '\0'; sym++)
68 symlen = strlen(++sym);
69 if (symlen < MINLEN || symlen > MAXLEN)
72 /* ignore symbols containing dots or dollar signs */
73 if (strchr(sym, '.') != NULL || strchr(sym, '$') != NULL)
79 if (tries >= MAXBADWORDS) {
80 mvcur(0, COLS - 1, LINES -1, 0);
82 errx(1, "can't seem a suitable symbol in %s",
86 strlcpy(Word, sym, sizeof(Word));
87 strlcpy(Known, sym, sizeof(Known));
88 for (sym = Known; *sym != '\0'; sym++) {
90 *sym = '_'; /* try not to confuse player */
91 if (isalnum((unsigned char)*sym))
99 if ((symfd = open(Dict_name, O_RDONLY)) < 0)
102 if (ksyms_elf_parse() == 0)
111 ksyms_elf_parse(void)
117 if (lseek(symfd, 0, SEEK_SET) == -1)
120 if (read(symfd, &eh, sizeof(eh)) != sizeof(eh))
126 if (lseek(symfd, eh.e_shoff, SEEK_SET) == -1)
132 for (s = 0; s < eh.e_shnum; s++) {
133 if (read(symfd, &sh, sizeof(sh)) != sizeof(sh))
137 * There should be two string table sections, one with the
138 * name of the sections themselves, and one with the symbol
139 * names. Just pick the largest one.
141 if (sh.sh_type == SHT_STRTAB) {
142 if (symsize > (off_t)sh.sh_size)
145 symoffs = (off_t)sh.sh_offset;
146 symsize = (off_t)sh.sh_size;