328 lines
9.0 KiB
C
328 lines
9.0 KiB
C
/*
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* Copyright (C) 2003-2007 Red Hat, Inc.
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*
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* This file is part of util-linux.
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*
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* This file is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This file is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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*
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* Written by Elliot Lee <sopwith@redhat.com>
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* New personality options & code added by Jindrich Novy <jnovy@redhat.com>
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* ADD_NO_RANDOMIZE flag added by Arjan van de Ven <arjanv@redhat.com>
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* Help and MIPS support from Mike Frysinger (vapier@gentoo.org)
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* Better error handling from Dmitry V. Levin (ldv@altlinux.org)
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*
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* based on ideas from the ppc32 util by Guy Streeter (2002-01), based on the
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* sparc32 util by Jakub Jelinek (1998, 1999)
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*/
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#include <syscall.h>
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#include <linux/personality.h>
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#include <unistd.h>
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#include <stdio.h>
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#include <string.h>
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#include <stdlib.h>
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#include <getopt.h>
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#include <limits.h>
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#include <sys/utsname.h>
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#include "nls.h"
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#include "c.h"
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#define set_pers(pers) ((long)syscall(SYS_personality, pers))
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/* Option --4gb has no equivalent short option, use a non-character as a
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pseudo short option. */
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#define OPT_4GB (CHAR_MAX+1)
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#define turn_on(_flag, _opts) \
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do { \
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(_opts) |= _flag; \
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if (verbose) \
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printf(_("Switching on %s.\n"), #_flag); \
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} while(0)
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#if !HAVE_DECL_ADDR_NO_RANDOMIZE
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# define ADDR_NO_RANDOMIZE 0x0040000
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#endif
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#if !HAVE_DECL_FDPIC_FUNCPTRS
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# define FDPIC_FUNCPTRS 0x0080000
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#endif
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#if !HAVE_DECL_MMAP_PAGE_ZERO
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# define MMAP_PAGE_ZERO 0x0100000
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#endif
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#if !HAVE_DECL_ADDR_COMPAT_LAYOUT
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# define ADDR_COMPAT_LAYOUT 0x0200000
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#endif
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#if !HAVE_DECL_READ_IMPLIES_EXEC
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# define READ_IMPLIES_EXEC 0x0400000
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#endif
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#if !HAVE_DECL_ADDR_LIMIT_32BIT
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# define ADDR_LIMIT_32BIT 0x0800000
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#endif
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#if !HAVE_DECL_SHORT_INODE
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# define SHORT_INODE 0x1000000
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#endif
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#if !HAVE_DECL_WHOLE_SECONDS
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# define WHOLE_SECONDS 0x2000000
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#endif
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#if !HAVE_DECL_STICKY_TIMEOUTS
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# define STICKY_TIMEOUTS 0x4000000
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#endif
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#if !HAVE_DECL_ADDR_LIMIT_3GB
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# define ADDR_LIMIT_3GB 0x8000000
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#endif
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/* Options --3gb and --4gb are for compatibitity with an old Debian setarch
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implementation. */
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static const struct option longopts[] =
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{
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{ "help", 0, 0, 'h' },
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{ "verbose", 0, 0, 'v' },
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{ "addr-no-randomize", 0, 0, 'R' },
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{ "fdpic-funcptrs", 0, 0, 'F' },
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{ "mmap-page-zero", 0, 0, 'Z' },
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{ "addr-compat-layout", 0, 0, 'L' },
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{ "read-implies-exec", 0, 0, 'X' },
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{ "32bit", 0, 0, 'B' },
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{ "short-inode", 0, 0, 'I' },
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{ "whole-seconds", 0, 0, 'S' },
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{ "sticky-timeouts", 0, 0, 'T' },
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{ "3gb", 0, 0, '3' },
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{ "4gb", 0, 0, OPT_4GB },
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{ NULL, 0, 0, 0 }
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};
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static void __attribute__((__noreturn__))
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show_help(void)
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{
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const char *p = program_invocation_short_name;
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if (!*p)
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p = "setarch";
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printf(_("Usage: %s%s [options] [program [program arguments]]\n\nOptions:\n"),
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p, !strcmp(p, "setarch") ? " <arch>" : "");
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printf(_(
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" -h, --help displays this help text\n"
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" -v, --verbose says what options are being switched on\n"
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" -R, --addr-no-randomize disables randomization of the virtual address space\n"
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" -F, --fdpic-funcptrs makes function pointers point to descriptors\n"
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" -Z, --mmap-page-zero turns on MMAP_PAGE_ZERO\n"
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" -L, --addr-compat-layout changes the way virtual memory is allocated\n"
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" -X, --read-implies-exec turns on READ_IMPLIES_EXEC\n"
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" -B, --32bit turns on ADDR_LIMIT_32BIT\n"
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" -I, --short-inode turns on SHORT_INODE\n"
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" -S, --whole-seconds turns on WHOLE_SECONDS\n"
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" -T, --sticky-timeouts turns on STICKY_TIMEOUTS\n"
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" -3, --3gb limits the used address space to a maximum of 3 GB\n"
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" --4gb ignored (for backward compatibility only)\n"));
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printf(_("\nFor more information see setarch(8).\n"));
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exit(EXIT_SUCCESS);
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}
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static void __attribute__((__noreturn__))
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show_usage(const char *s)
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{
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const char *p = program_invocation_short_name;
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if (!*p)
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p = "setarch";
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fprintf(stderr, _("%s: %s\nTry `%s --help' for more information.\n"), p, s, p);
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exit(EXIT_FAILURE);
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}
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int set_arch(const char *pers, unsigned long options)
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{
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struct utsname un;
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int i;
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unsigned long pers_value, res;
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struct {
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int perval;
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const char *target_arch, *result_arch;
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} transitions[] = {
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{PER_LINUX32, "linux32", NULL},
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{PER_LINUX, "linux64", NULL},
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#if defined(__powerpc__) || defined(__powerpc64__)
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{PER_LINUX32, "ppc32", "ppc"},
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{PER_LINUX32, "ppc", "ppc"},
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{PER_LINUX, "ppc64", "ppc64"},
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{PER_LINUX, "ppc64pseries", "ppc64"},
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{PER_LINUX, "ppc64iseries", "ppc64"},
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#endif
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#if defined(__x86_64__) || defined(__i386__) || defined(__ia64__)
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{PER_LINUX32, "i386", "i386"},
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{PER_LINUX32, "i486", "i386"},
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{PER_LINUX32, "i586", "i386"},
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{PER_LINUX32, "i686", "i386"},
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{PER_LINUX32, "athlon", "i386"},
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#endif
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#if defined(__x86_64__) || defined(__i386__)
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{PER_LINUX, "x86_64", "x86_64"},
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#endif
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#if defined(__ia64__) || defined(__i386__)
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{PER_LINUX, "ia64", "ia64"},
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#endif
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#if defined(__hppa__)
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{PER_LINUX32, "parisc32", "parisc"},
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{PER_LINUX32, "parisc", "parisc"},
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{PER_LINUX, "parisc64", "parisc64"},
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#endif
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#if defined(__s390x__) || defined(__s390__)
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{PER_LINUX32, "s390", "s390"},
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{PER_LINUX, "s390x", "s390x"},
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#endif
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#if defined(__sparc64__) || defined(__sparc__)
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{PER_LINUX32, "sparc", "sparc"},
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{PER_LINUX32, "sparc32bash", "sparc"},
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{PER_LINUX32, "sparc32", "sparc"},
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{PER_LINUX, "sparc64", "sparc64"},
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#endif
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#if defined(__mips64__) || defined(__mips__)
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{PER_LINUX32, "mips32", "mips"},
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{PER_LINUX32, "mips", "mips"},
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{PER_LINUX, "mips64", "mips64"},
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#endif
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#if defined(__alpha__)
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{PER_LINUX, "alpha", "alpha"},
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{PER_LINUX, "alphaev5", "alpha"},
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{PER_LINUX, "alphaev56", "alpha"},
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{PER_LINUX, "alphaev6", "alpha"},
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{PER_LINUX, "alphaev67", "alpha"},
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#endif
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{-1, NULL, NULL}
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};
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for(i = 0; transitions[i].perval >= 0; i++)
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if(!strcmp(pers, transitions[i].target_arch))
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break;
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if(transitions[i].perval < 0)
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errx(EXIT_FAILURE, _("%s: Unrecognized architecture"), pers);
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pers_value = transitions[i].perval | options;
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res = set_pers(pers_value);
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if(res == -EINVAL)
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return 1;
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uname(&un);
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if(transitions[i].result_arch &&
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strcmp(un.machine, transitions[i].result_arch))
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{
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if(strcmp(transitions[i].result_arch, "i386")
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|| (strcmp(un.machine, "i486")
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&& strcmp(un.machine, "i586")
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&& strcmp(un.machine, "i686")
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&& strcmp(un.machine, "athlon")))
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errx(EXIT_FAILURE, _("%s: Unrecognized architecture"), pers);
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}
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return 0;
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}
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int main(int argc, char *argv[])
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{
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const char *p;
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unsigned long options = 0;
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int verbose = 0;
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int c;
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setlocale(LC_ALL, "");
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bindtextdomain(PACKAGE, LOCALEDIR);
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textdomain(PACKAGE);
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if (argc < 1)
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show_usage(_("Not enough arguments"));
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p = program_invocation_short_name;
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if (!strcmp(p, "setarch")) {
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argv++;
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argc--;
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if (argc < 1)
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show_usage(_("Not enough arguments"));
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p = argv[0];
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argv[0] = argv[-1]; /* for getopt_long() to get the program name */
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if (!strcmp(p, "-h") || !strcmp(p, "--help"))
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show_help();
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}
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#if defined(__sparc64__) || defined(__sparc__)
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if (!strcmp(p, "sparc32bash")) {
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if (set_arch(p, 0L))
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err(EXIT_FAILURE, _("Failed to set personality to %s"), p);
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execl("/bin/bash", NULL);
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err(EXIT_FAILURE, "/bin/bash");
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}
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#endif
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while ((c = getopt_long(argc, argv, "+hv3BFILRSTXZ", longopts, NULL)) != -1) {
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switch (c) {
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case 'h':
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show_help();
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break;
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case 'v':
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verbose = 1;
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break;
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case 'R':
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turn_on(ADDR_NO_RANDOMIZE, options);
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break;
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case 'F':
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turn_on(FDPIC_FUNCPTRS, options);
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break;
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case 'Z':
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turn_on(MMAP_PAGE_ZERO, options);
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break;
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case 'L':
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turn_on(ADDR_COMPAT_LAYOUT, options);
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break;
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case 'X':
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turn_on(READ_IMPLIES_EXEC, options);
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break;
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case 'B':
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turn_on(ADDR_LIMIT_32BIT, options);
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break;
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case 'I':
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turn_on(SHORT_INODE, options);
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break;
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case 'S':
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turn_on(WHOLE_SECONDS, options);
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break;
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case 'T':
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turn_on(STICKY_TIMEOUTS, options);
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break;
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case '3':
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turn_on(ADDR_LIMIT_3GB, options);
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break;
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case OPT_4GB: /* just ignore this one */
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break;
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}
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}
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argc -= optind;
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argv += optind;
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if (set_arch(p, options))
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err(EXIT_FAILURE, _("Failed to set personality to %s"), p);
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if (!argc) {
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execl("/bin/sh", "-sh", NULL);
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err(EXIT_FAILURE, "/bin/sh");
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}
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execvp(argv[0], argv);
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err(EXIT_FAILURE, "%s", argv[0]);
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return EXIT_FAILURE;
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}
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