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8855c38d KZ |
1 | /* |
2 | * Copyright (C) 2003-2007 Red Hat, Inc. | |
3 | * | |
601d12fb | 4 | * This file is part of util-linux. |
8855c38d KZ |
5 | * |
6 | * This file is free software; you can redistribute it and/or modify | |
7 | * it under the terms of the GNU General Public License as published by | |
8 | * the Free Software Foundation; either version 2 of the License, or | |
9 | * (at your option) any later version. | |
10 | * | |
11 | * This file is distributed in the hope that it will be useful, | |
12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | * GNU General Public License for more details. | |
15 | * | |
8b3a46d2 KZ |
16 | * |
17 | * Written by Elliot Lee <sopwith@redhat.com> | |
18 | * New personality options & code added by Jindrich Novy <jnovy@redhat.com> | |
19 | * ADD_NO_RANDOMIZE flag added by Arjan van de Ven <arjanv@redhat.com> | |
20 | * Help and MIPS support from Mike Frysinger (vapier@gentoo.org) | |
21 | * Better error handling from Dmitry V. Levin (ldv@altlinux.org) | |
22 | * | |
23 | * based on ideas from the ppc32 util by Guy Streeter (2002-01), based on the | |
24 | * sparc32 util by Jakub Jelinek (1998, 1999) | |
25 | */ | |
26 | ||
9ed11cc2 | 27 | #include <sys/personality.h> |
8b3a46d2 KZ |
28 | #include <unistd.h> |
29 | #include <stdio.h> | |
30 | #include <string.h> | |
31 | #include <stdlib.h> | |
8df90dec KZ |
32 | #include <getopt.h> |
33 | #include <limits.h> | |
8b3a46d2 | 34 | #include <sys/utsname.h> |
a5b47e0a | 35 | #include "nls.h" |
c60103a9 | 36 | #include "c.h" |
efb8854f | 37 | #include "closestream.h" |
8b3a46d2 | 38 | |
9ed11cc2 SK |
39 | #ifndef HAVE_PERSONALITY |
40 | # include <syscall.h> | |
41 | # define personality(pers) ((long)syscall(SYS_personality, pers)) | |
42 | #endif | |
8b3a46d2 | 43 | |
8df90dec KZ |
44 | #define turn_on(_flag, _opts) \ |
45 | do { \ | |
46 | (_opts) |= _flag; \ | |
47 | if (verbose) \ | |
48 | printf(_("Switching on %s.\n"), #_flag); \ | |
49 | } while(0) | |
50 | ||
f29a3d18 | 51 | #ifndef UNAME26 |
70eebc40 BH |
52 | # define UNAME26 0x0020000 |
53 | #endif | |
f29a3d18 | 54 | #ifndef ADDR_NO_RANDOMIZE |
2d281745 KZ |
55 | # define ADDR_NO_RANDOMIZE 0x0040000 |
56 | #endif | |
f29a3d18 | 57 | #ifndef FDPIC_FUNCPTRS |
2d281745 KZ |
58 | # define FDPIC_FUNCPTRS 0x0080000 |
59 | #endif | |
f29a3d18 | 60 | #ifndef MMAP_PAGE_ZERO |
2d281745 KZ |
61 | # define MMAP_PAGE_ZERO 0x0100000 |
62 | #endif | |
f29a3d18 | 63 | #ifndef ADDR_COMPAT_LAYOUT |
2d281745 KZ |
64 | # define ADDR_COMPAT_LAYOUT 0x0200000 |
65 | #endif | |
f29a3d18 | 66 | #ifndef READ_IMPLIES_EXEC |
2d281745 KZ |
67 | # define READ_IMPLIES_EXEC 0x0400000 |
68 | #endif | |
f29a3d18 | 69 | #ifndef ADDR_LIMIT_32BIT |
2d281745 KZ |
70 | # define ADDR_LIMIT_32BIT 0x0800000 |
71 | #endif | |
f29a3d18 | 72 | #ifndef SHORT_INODE |
2d281745 KZ |
73 | # define SHORT_INODE 0x1000000 |
74 | #endif | |
f29a3d18 | 75 | #ifndef WHOLE_SECONDS |
2d281745 KZ |
76 | # define WHOLE_SECONDS 0x2000000 |
77 | #endif | |
f29a3d18 | 78 | #ifndef STICKY_TIMEOUTS |
2d281745 KZ |
79 | # define STICKY_TIMEOUTS 0x4000000 |
80 | #endif | |
f29a3d18 | 81 | #ifndef ADDR_LIMIT_3GB |
2d281745 KZ |
82 | # define ADDR_LIMIT_3GB 0x8000000 |
83 | #endif | |
84 | ||
5edb0ea6 KZ |
85 | static int archwrapper; |
86 | ||
77eb13b9 | 87 | static void __attribute__((__noreturn__)) show_help(void) |
8b3a46d2 | 88 | { |
77eb13b9 | 89 | fputs(USAGE_HEADER, stdout); |
5edb0ea6 | 90 | if (!archwrapper) |
68243049 BS |
91 | printf(_(" %s <arch> [options] [<program> [<argument>...]]\n"), program_invocation_short_name); |
92 | else | |
93 | printf(_(" %s [options] [<program> [<argument>...]]\n"), program_invocation_short_name); | |
451dbcfa BS |
94 | |
95 | fputs(USAGE_SEPARATOR, stdout); | |
96 | fputs(_("Change the reported architecture and set personality flags.\n"), stdout); | |
97 | ||
77eb13b9 | 98 | fputs(USAGE_OPTIONS, stdout); |
77eb13b9 | 99 | fputs(_(" -B, --32bit turns on ADDR_LIMIT_32BIT\n"), stdout); |
26b0b857 | 100 | fputs(_(" -F, --fdpic-funcptrs makes function pointers point to descriptors\n"), stdout); |
77eb13b9 | 101 | fputs(_(" -I, --short-inode turns on SHORT_INODE\n"), stdout); |
26b0b857 BS |
102 | fputs(_(" -L, --addr-compat-layout changes the way virtual memory is allocated\n"), stdout); |
103 | fputs(_(" -R, --addr-no-randomize disables randomization of the virtual address space\n"), stdout); | |
77eb13b9 SK |
104 | fputs(_(" -S, --whole-seconds turns on WHOLE_SECONDS\n"), stdout); |
105 | fputs(_(" -T, --sticky-timeouts turns on STICKY_TIMEOUTS\n"), stdout); | |
26b0b857 BS |
106 | fputs(_(" -X, --read-implies-exec turns on READ_IMPLIES_EXEC\n"), stdout); |
107 | fputs(_(" -Z, --mmap-page-zero turns on MMAP_PAGE_ZERO\n"), stdout); | |
77eb13b9 SK |
108 | fputs(_(" -3, --3gb limits the used address space to a maximum of 3 GB\n"), stdout); |
109 | fputs(_(" --4gb ignored (for backward compatibility only)\n"), stdout); | |
110 | fputs(_(" --uname-2.6 turns on UNAME26\n"), stdout); | |
26b0b857 | 111 | fputs(_(" -v, --verbose say what options are being switched on\n"), stdout); |
5edb0ea6 KZ |
112 | |
113 | if (!archwrapper) | |
114 | fputs(_(" --list list settable architectures, and exit\n"), stdout); | |
26b0b857 | 115 | |
77eb13b9 SK |
116 | fputs(USAGE_SEPARATOR, stdout); |
117 | fputs(USAGE_HELP, stdout); | |
118 | fputs(USAGE_VERSION, stdout); | |
119 | printf(USAGE_MAN_TAIL("setarch(8)")); | |
26b0b857 | 120 | |
77eb13b9 | 121 | exit(EXIT_SUCCESS); |
8b3a46d2 KZ |
122 | } |
123 | ||
77eb13b9 | 124 | static void __attribute__((__noreturn__)) show_usage(const char *s) |
8b3a46d2 | 125 | { |
77eb13b9 SK |
126 | if (s) |
127 | errx(EXIT_FAILURE, | |
128 | _("%s\nTry `%s --help' for more information."), s, | |
129 | program_invocation_short_name); | |
130 | else | |
131 | errx(EXIT_FAILURE, _("Try `%s --help' for more information."), | |
132 | program_invocation_short_name); | |
8b3a46d2 KZ |
133 | } |
134 | ||
b446402b | 135 | static void __attribute__((__noreturn__)) |
77eb13b9 | 136 | show_version(void) |
b446402b | 137 | { |
77eb13b9 SK |
138 | printf(UTIL_LINUX_VERSION); |
139 | exit(EXIT_SUCCESS); | |
b446402b | 140 | } |
8df90dec | 141 | |
77eb13b9 | 142 | static int set_arch(const char *pers, unsigned long options, int list) |
8b3a46d2 | 143 | { |
77eb13b9 SK |
144 | struct utsname un; |
145 | int i; | |
146 | unsigned long pers_value; | |
147 | ||
148 | struct { | |
149 | int perval; | |
150 | const char *target_arch, *result_arch; | |
151 | } transitions[] = { | |
152 | {UNAME26, "uname26", NULL}, | |
153 | {PER_LINUX32, "linux32", NULL}, | |
154 | {PER_LINUX, "linux64", NULL}, | |
8b3a46d2 | 155 | #if defined(__powerpc__) || defined(__powerpc64__) |
77eb13b9 SK |
156 | # ifdef __BIG_ENDIAN__ |
157 | {PER_LINUX32, "ppc32", "ppc"}, | |
158 | {PER_LINUX32, "ppc", "ppc"}, | |
159 | {PER_LINUX, "ppc64", "ppc64"}, | |
160 | {PER_LINUX, "ppc64pseries", "ppc64"}, | |
161 | {PER_LINUX, "ppc64iseries", "ppc64"}, | |
162 | # else | |
163 | PER_LINUX32, "ppc32le", "ppcle"}, | |
164 | PER_LINUX32, "ppcle", "ppcle"}, | |
165 | PER_LINUX, "ppc64le", "ppc64le"}, | |
166 | # endif | |
8b3a46d2 KZ |
167 | #endif |
168 | #if defined(__x86_64__) || defined(__i386__) || defined(__ia64__) | |
77eb13b9 SK |
169 | {PER_LINUX32, "i386", "i386"}, |
170 | {PER_LINUX32, "i486", "i386"}, | |
171 | {PER_LINUX32, "i586", "i386"}, | |
172 | {PER_LINUX32, "i686", "i386"}, | |
173 | {PER_LINUX32, "athlon", "i386"}, | |
8b3a46d2 KZ |
174 | #endif |
175 | #if defined(__x86_64__) || defined(__i386__) | |
77eb13b9 | 176 | {PER_LINUX, "x86_64", "x86_64"}, |
8b3a46d2 KZ |
177 | #endif |
178 | #if defined(__ia64__) || defined(__i386__) | |
77eb13b9 | 179 | {PER_LINUX, "ia64", "ia64"}, |
8b3a46d2 | 180 | #endif |
782e198d | 181 | #if defined(__hppa__) |
77eb13b9 SK |
182 | {PER_LINUX32, "parisc32", "parisc"}, |
183 | {PER_LINUX32, "parisc", "parisc"}, | |
184 | {PER_LINUX, "parisc64", "parisc64"}, | |
782e198d | 185 | #endif |
8b3a46d2 | 186 | #if defined(__s390x__) || defined(__s390__) |
77eb13b9 SK |
187 | {PER_LINUX32, "s390", "s390"}, |
188 | {PER_LINUX, "s390x", "s390x"}, | |
8b3a46d2 KZ |
189 | #endif |
190 | #if defined(__sparc64__) || defined(__sparc__) | |
77eb13b9 SK |
191 | {PER_LINUX32, "sparc", "sparc"}, |
192 | {PER_LINUX32, "sparc32bash", "sparc"}, | |
193 | {PER_LINUX32, "sparc32", "sparc"}, | |
194 | {PER_LINUX, "sparc64", "sparc64"}, | |
8b3a46d2 KZ |
195 | #endif |
196 | #if defined(__mips64__) || defined(__mips__) | |
77eb13b9 SK |
197 | {PER_LINUX32, "mips32", "mips"}, |
198 | {PER_LINUX32, "mips", "mips"}, | |
199 | {PER_LINUX, "mips64", "mips64"}, | |
9e19737a BC |
200 | #endif |
201 | #if defined(__alpha__) | |
77eb13b9 SK |
202 | {PER_LINUX, "alpha", "alpha"}, |
203 | {PER_LINUX, "alphaev5", "alpha"}, | |
204 | {PER_LINUX, "alphaev56", "alpha"}, | |
205 | {PER_LINUX, "alphaev6", "alpha"}, | |
206 | {PER_LINUX, "alphaev67", "alpha"}, | |
8b3a46d2 | 207 | #endif |
77eb13b9 SK |
208 | /* place holder, will be filled up at runtime */ |
209 | {-1, NULL, NULL}, | |
210 | {-1, NULL, NULL} | |
211 | }; | |
212 | ||
213 | /* Add the trivial transition {PER_LINUX, machine, machine} if no | |
214 | * such target_arch is hardcoded yet. */ | |
215 | uname(&un); | |
216 | for (i = 0; transitions[i].perval >= 0; i++) | |
217 | if (!strcmp(un.machine, transitions[i].target_arch)) | |
218 | break; | |
219 | if (transitions[i].perval < 0) { | |
220 | unsigned long wrdsz = CHAR_BIT * sizeof(void *); | |
221 | if (wrdsz == 32 || wrdsz == 64) { | |
222 | /* fill up the place holder */ | |
223 | transitions[i].perval = wrdsz == 32 ? PER_LINUX32 : PER_LINUX; | |
224 | transitions[i].target_arch = un.machine; | |
225 | transitions[i].result_arch = un.machine; | |
226 | } | |
ae2c3b5b | 227 | } |
77eb13b9 SK |
228 | if (list) { |
229 | for (i = 0; transitions[i].target_arch != NULL; i++) | |
230 | printf("%s\n", transitions[i].target_arch); | |
231 | return 0; | |
232 | } | |
233 | for (i = 0; transitions[i].perval >= 0; i++) | |
234 | if (!strcmp(pers, transitions[i].target_arch)) | |
235 | break; | |
236 | if (transitions[i].perval < 0) | |
237 | errx(EXIT_FAILURE, _("%s: Unrecognized architecture"), pers); | |
238 | pers_value = transitions[i].perval | options; | |
9ed11cc2 | 239 | if (personality(pers_value) == -EINVAL) |
77eb13b9 SK |
240 | return 1; |
241 | uname(&un); | |
242 | if (transitions[i].result_arch && strcmp(un.machine, transitions[i].result_arch)) { | |
243 | if (strcmp(transitions[i].result_arch, "i386") | |
244 | || (strcmp(un.machine, "i486") | |
245 | && strcmp(un.machine, "i586") | |
246 | && strcmp(un.machine, "i686") | |
247 | && strcmp(un.machine, "athlon"))) | |
1e098672 | 248 | errx(EXIT_FAILURE, _("Kernel cannot set architecture to %s"), pers); |
77eb13b9 SK |
249 | } |
250 | return 0; | |
8b3a46d2 KZ |
251 | } |
252 | ||
253 | int main(int argc, char *argv[]) | |
254 | { | |
5edb0ea6 | 255 | const char *arch = NULL; |
77eb13b9 SK |
256 | unsigned long options = 0; |
257 | int verbose = 0; | |
258 | int c; | |
259 | ||
5edb0ea6 KZ |
260 | /* Options without equivalent short options */ |
261 | enum { | |
262 | OPT_4GB = CHAR_MAX + 1, | |
263 | OPT_UNAME26, | |
264 | OPT_LIST | |
265 | }; | |
266 | ||
77eb13b9 SK |
267 | /* Options --3gb and --4gb are for compatibitity with an old |
268 | * Debian setarch implementation. */ | |
269 | static const struct option longopts[] = { | |
270 | {"help", no_argument, NULL, 'h'}, | |
271 | {"version", no_argument, NULL, 'V'}, | |
272 | {"verbose", no_argument, NULL, 'v'}, | |
273 | {"addr-no-randomize", no_argument, NULL, 'R'}, | |
274 | {"fdpic-funcptrs", no_argument, NULL, 'F'}, | |
275 | {"mmap-page-zero", no_argument, NULL, 'Z'}, | |
276 | {"addr-compat-layout", no_argument, NULL, 'L'}, | |
277 | {"read-implies-exec", no_argument, NULL, 'X'}, | |
278 | {"32bit", no_argument, NULL, 'B'}, | |
279 | {"short-inode", no_argument, NULL, 'I'}, | |
280 | {"whole-seconds", no_argument, NULL, 'S'}, | |
281 | {"sticky-timeouts", no_argument, NULL, 'T'}, | |
282 | {"3gb", no_argument, NULL, '3'}, | |
283 | {"4gb", no_argument, NULL, OPT_4GB}, | |
284 | {"uname-2.6", no_argument, NULL, OPT_UNAME26}, | |
5edb0ea6 | 285 | {"list", no_argument, NULL, OPT_LIST}, |
77eb13b9 SK |
286 | {NULL, 0, NULL, 0} |
287 | }; | |
288 | ||
289 | setlocale(LC_ALL, ""); | |
290 | bindtextdomain(PACKAGE, LOCALEDIR); | |
291 | textdomain(PACKAGE); | |
292 | atexit(close_stdout); | |
293 | ||
294 | if (argc < 1) | |
295 | show_usage(_("Not enough arguments")); | |
296 | ||
5edb0ea6 KZ |
297 | archwrapper = strcmp(program_invocation_short_name, "setarch") != 0; |
298 | if (archwrapper) | |
299 | arch = program_invocation_short_name; /* symlinks to setarch */ | |
300 | else { | |
301 | if (*argv[1] != '-') { | |
302 | arch = argv[1]; | |
303 | argv[1] = argv[0]; /* for getopt_long() to get the program name */ | |
304 | argv++; | |
305 | argc--; | |
77eb13b9 SK |
306 | } |
307 | } | |
5edb0ea6 | 308 | |
77eb13b9 | 309 | #if defined(__sparc64__) || defined(__sparc__) |
5edb0ea6 KZ |
310 | if (archwrapper && strcmp(arch, "sparc32bash") == 0) { |
311 | if (set_arch(arch, 0L, 0)) | |
77eb13b9 SK |
312 | err(EXIT_FAILURE, _("Failed to set personality to %s"), p); |
313 | execl("/bin/bash", NULL); | |
314 | err(EXIT_FAILURE, _("failed to execute %s"), "/bin/bash"); | |
315 | } | |
316 | #endif | |
8b3a46d2 | 317 | |
77eb13b9 SK |
318 | while ((c = getopt_long(argc, argv, "+hVv3BFILRSTXZ", longopts, NULL)) != -1) { |
319 | switch (c) { | |
320 | case 'h': | |
321 | show_help(); | |
322 | break; | |
323 | case 'V': | |
324 | show_version(); | |
325 | break; | |
326 | case 'v': | |
327 | verbose = 1; | |
328 | break; | |
329 | case 'R': | |
330 | turn_on(ADDR_NO_RANDOMIZE, options); | |
331 | break; | |
332 | case 'F': | |
333 | turn_on(FDPIC_FUNCPTRS, options); | |
334 | break; | |
335 | case 'Z': | |
336 | turn_on(MMAP_PAGE_ZERO, options); | |
337 | break; | |
338 | case 'L': | |
339 | turn_on(ADDR_COMPAT_LAYOUT, options); | |
340 | break; | |
341 | case 'X': | |
342 | turn_on(READ_IMPLIES_EXEC, options); | |
343 | break; | |
344 | case 'B': | |
345 | turn_on(ADDR_LIMIT_32BIT, options); | |
346 | break; | |
347 | case 'I': | |
348 | turn_on(SHORT_INODE, options); | |
349 | break; | |
350 | case 'S': | |
351 | turn_on(WHOLE_SECONDS, options); | |
352 | break; | |
353 | case 'T': | |
354 | turn_on(STICKY_TIMEOUTS, options); | |
355 | break; | |
356 | case '3': | |
357 | turn_on(ADDR_LIMIT_3GB, options); | |
358 | break; | |
359 | case OPT_4GB: /* just ignore this one */ | |
360 | break; | |
361 | case OPT_UNAME26: | |
362 | turn_on(UNAME26, options); | |
363 | break; | |
5edb0ea6 KZ |
364 | case OPT_LIST: |
365 | if (!archwrapper) { | |
366 | set_arch(NULL, 0, 1); | |
b2b5b502 | 367 | return EXIT_SUCCESS; |
5edb0ea6 KZ |
368 | } else |
369 | warnx(_("unrecognized option '--list'")); | |
77eb13b9 SK |
370 | default: |
371 | show_usage(NULL); | |
372 | } | |
373 | } | |
8b3a46d2 | 374 | |
5edb0ea6 KZ |
375 | if (!arch) |
376 | errx(EXIT_FAILURE, _("no architecture argument specified")); | |
377 | ||
77eb13b9 SK |
378 | argc -= optind; |
379 | argv += optind; | |
8df90dec | 380 | |
5edb0ea6 KZ |
381 | if (set_arch(arch, options, 0)) |
382 | err(EXIT_FAILURE, _("failed to set personality to %s"), arch); | |
8b3a46d2 | 383 | |
77eb13b9 SK |
384 | /* flush all output streams before exec */ |
385 | fflush(NULL); | |
34c265f0 | 386 | |
77eb13b9 SK |
387 | if (!argc) { |
388 | execl("/bin/sh", "-sh", NULL); | |
389 | err(EXIT_FAILURE, _("failed to execute %s"), "/bin/sh"); | |
390 | } | |
8b3a46d2 | 391 | |
77eb13b9 SK |
392 | execvp(argv[0], argv); |
393 | err(EXIT_FAILURE, "%s", argv[0]); | |
394 | return EXIT_FAILURE; | |
8b3a46d2 | 395 | } |