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/*
* Copyright (C) 2003-2007 Red Hat, Inc.
*
* This file is part of util-linux-ng.
*
* This file is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This file is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
*
* Written by Elliot Lee <sopwith@redhat.com>
* New personality options & code added by Jindrich Novy <jnovy@redhat.com>
* ADD_NO_RANDOMIZE flag added by Arjan van de Ven <arjanv@redhat.com>
* Help and MIPS support from Mike Frysinger (vapier@gentoo.org)
* Better error handling from Dmitry V. Levin (ldv@altlinux.org)
*
* based on ideas from the ppc32 util by Guy Streeter (2002-01), based on the
* sparc32 util by Jakub Jelinek (1998, 1999)
*/
#ifndef _GNU_SOURCE
# define _GNU_SOURCE
#endif
#include <syscall.h>
#include <linux/personality.h>
#include <unistd.h>
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <errno.h>
#include <error.h>
#include <sys/utsname.h>
#include "nls.h"
#define set_pers(pers) ((long)syscall(SYS_personality, pers))
struct {
char c;
const char *name;
unsigned int option;
} flags[] = {
{'R', "ADDR_NO_RANDOMIZE", 0x0040000},
{'F', "FDPIC_FUNCPTRS", 0x0080000},
{'Z', "MMAP_PAGE_ZERO", 0x0100000},
{'L', "ADDR_COMPAT_LAYOUT", 0x0200000},
{'X', "READ_IMPLIES_EXEC", 0x0400000},
{'B', "ADDR_LIMIT_32BIT", 0x0800000},
{'I', "SHORT_INODE", 0x1000000},
{'S', "WHOLE_SECONDS", 0x2000000},
{'T', "STICKY_TIMEOUTS", 0x4000000},
{'3', "ADDR_LIMIT_3GB", 0x8000000}
};
static void __attribute__((__noreturn__))
show_help(void)
{
int f;
const char *p = program_invocation_short_name;
if (!*p)
p = "setarch";
printf(_("Usage: %s%s [options] [program [program arguments]]\n\nOptions:\n"),
p, !strcmp(p, "setarch") ? " <arch>" : "");
for (f = 0; f < sizeof(flags) / sizeof(flags[0]); f++)
printf(_("\t-%c\tEnable %s\n"), flags[f].c, flags[f].name);
printf(_("\nFor more information see setarch(8).\n"));
exit(EXIT_SUCCESS);
}
static void __attribute__((__noreturn__))
show_usage(const char *s)
{
const char *p = program_invocation_short_name;
if (!*p)
p = "setarch";
fprintf(stderr, _("%s: %s\nTry `%s --help' for more information.\n"), p, s, p);
exit(EXIT_FAILURE);
}
int set_arch(const char *pers, unsigned long options)
{
struct utsname un;
int i;
unsigned long pers_value, res;
struct {
int perval;
const char *target_arch, *result_arch;
} transitions[] = {
{PER_LINUX32, "linux32", NULL},
{PER_LINUX, "linux64", NULL},
#if defined(__powerpc__) || defined(__powerpc64__)
{PER_LINUX32, "ppc32", "ppc"},
{PER_LINUX32, "ppc", "ppc"},
{PER_LINUX, "ppc64", "ppc64"},
{PER_LINUX, "ppc64pseries", "ppc64"},
{PER_LINUX, "ppc64iseries", "ppc64"},
#endif
#if defined(__x86_64__) || defined(__i386__) || defined(__ia64__)
{PER_LINUX32, "i386", "i386"},
{PER_LINUX32, "i486", "i386"},
{PER_LINUX32, "i586", "i386"},
{PER_LINUX32, "i686", "i386"},
{PER_LINUX32, "athlon", "i386"},
#endif
#if defined(__x86_64__) || defined(__i386__)
{PER_LINUX, "x86_64", "x86_64"},
#endif
#if defined(__ia64__) || defined(__i386__)
{PER_LINUX, "ia64", "ia64"},
#endif
#if defined(__s390x__) || defined(__s390__)
{PER_LINUX32, "s390", "s390"},
{PER_LINUX, "s390x", "s390x"},
#endif
#if defined(__sparc64__) || defined(__sparc__)
{PER_LINUX32, "sparc", "sparc"},
{PER_LINUX32, "sparc32bash", "sparc"},
{PER_LINUX32, "sparc32", "sparc"},
{PER_LINUX, "sparc64", "sparc64"},
#endif
#if defined(__mips64__) || defined(__mips__)
{PER_LINUX32, "mips32", "mips"},
{PER_LINUX32, "mips", "mips"},
{PER_LINUX, "mips64", "mips64"},
#endif
#if defined(__alpha__)
{PER_LINUX, "alpha", "alpha"},
#endif
{-1, NULL, NULL}
};
for(i = 0; transitions[i].perval >= 0; i++)
if(!strcmp(pers, transitions[i].target_arch))
break;
if(transitions[i].perval < 0)
error(EXIT_FAILURE, 0, _("%s: Unrecognized architecture"), pers);
pers_value = transitions[i].perval | options;
res = set_pers(pers_value);
if(res == -EINVAL)
return 1;
uname(&un);
if(transitions[i].result_arch &&
strcmp(un.machine, transitions[i].result_arch))
{
if(strcmp(transitions[i].result_arch, "i386")
|| (strcmp(un.machine, "i486")
&& strcmp(un.machine, "i586")
&& strcmp(un.machine, "i686")
&& strcmp(un.machine, "athlon")))
error(EXIT_FAILURE, 0, _("%s: Unrecognized architecture"), pers);
}
return 0;
}
int main(int argc, char *argv[])
{
const char *p;
unsigned long options = 0;
int verbose = 0;
setlocale(LC_ALL, "");
bindtextdomain(PACKAGE, LOCALEDIR);
textdomain(PACKAGE);
if (argc < 1)
show_usage(_("Not enough arguments"));
p = program_invocation_short_name;
if (!strcmp(p, "setarch")) {
argv++;
argc--;
if (argc < 1)
show_usage(_("Not enough arguments"));
p = argv[0];
if (!strcmp(p, "-h") || !strcmp(p, "--help"))
show_help();
}
#if defined(__sparc64__) || defined(__sparc__)
if (!strcmp(p, "sparc32bash")) {
if (set_arch(p, NULL))
error(EXIT_FAILURE, errno, "Failed to set personality to %s", p);
execl("/bin/bash", NULL);
error(EXIT_FAILURE, errno, "/bin/bash");
}
#endif
for (argv++, argc--; argc && argv[0][0] == '-'; argv++, argc--) {
int n, unknown = 1;
const char *arg = argv[0];
if (!strcmp(arg, "--help"))
show_help();
for (n = 1; arg[n]; n++) {
int f;
if (arg[n] == 'v') {
verbose = 1;
continue;
}
if (arg[n] == 'h')
show_help();
for (f = 0; f < sizeof(flags) / sizeof(flags[0]); f++) {
if (arg[n] == flags[f].c) {
if (verbose)
fprintf(stderr, _("Switching on %s.\n"), flags[f].name);
options |= flags[f].option;
unknown = 0;
break;
}
}
if (unknown)
error(0, 0, _("Unknown option `%c' ignored"), arg[n]);
}
}
if (set_arch(p, options))
error(EXIT_FAILURE, errno, _("Failed to set personality to %s"), p);
if (!argc) {
execl("/bin/sh", "-sh", NULL);
error(EXIT_FAILURE, errno, "/bin/sh");
}
execvp(argv[0], argv);
error(EXIT_FAILURE, errno, "%s", argv[0]);
return EXIT_FAILURE;
}
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