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-rw-r--r--sys-utils/setarch.c446
1 files changed, 446 insertions, 0 deletions
diff --git a/sys-utils/setarch.c b/sys-utils/setarch.c
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+++ b/sys-utils/setarch.c
@@ -0,0 +1,446 @@
+/*
+ * Copyright (C) 2003-2007 Red Hat, Inc.
+ *
+ * This file is part of util-linux.
+ *
+ * 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)
+ */
+
+#include <sys/personality.h>
+#include <unistd.h>
+#include <stdio.h>
+#include <string.h>
+#include <stdlib.h>
+#include <getopt.h>
+#include <limits.h>
+#include <sys/utsname.h>
+#include "nls.h"
+#include "c.h"
+#include "closestream.h"
+
+#ifndef HAVE_PERSONALITY
+# include <syscall.h>
+# define personality(pers) ((long)syscall(SYS_personality, pers))
+#endif
+
+#define turn_on(_flag, _opts) \
+ do { \
+ (_opts) |= _flag; \
+ if (verbose) \
+ printf(_("Switching on %s.\n"), #_flag); \
+ } while(0)
+
+#ifndef UNAME26
+# define UNAME26 0x0020000
+#endif
+#ifndef ADDR_NO_RANDOMIZE
+# define ADDR_NO_RANDOMIZE 0x0040000
+#endif
+#ifndef FDPIC_FUNCPTRS
+# define FDPIC_FUNCPTRS 0x0080000
+#endif
+#ifndef MMAP_PAGE_ZERO
+# define MMAP_PAGE_ZERO 0x0100000
+#endif
+#ifndef ADDR_COMPAT_LAYOUT
+# define ADDR_COMPAT_LAYOUT 0x0200000
+#endif
+#ifndef READ_IMPLIES_EXEC
+# define READ_IMPLIES_EXEC 0x0400000
+#endif
+#ifndef ADDR_LIMIT_32BIT
+# define ADDR_LIMIT_32BIT 0x0800000
+#endif
+#ifndef SHORT_INODE
+# define SHORT_INODE 0x1000000
+#endif
+#ifndef WHOLE_SECONDS
+# define WHOLE_SECONDS 0x2000000
+#endif
+#ifndef STICKY_TIMEOUTS
+# define STICKY_TIMEOUTS 0x4000000
+#endif
+#ifndef ADDR_LIMIT_3GB
+# define ADDR_LIMIT_3GB 0x8000000
+#endif
+
+
+struct arch_domain {
+ int perval; /* PER_* */
+ const char *target_arch;
+ const char *result_arch;
+};
+
+
+static void __attribute__((__noreturn__)) usage(int archwrapper)
+{
+ fputs(USAGE_HEADER, stdout);
+ if (!archwrapper)
+ printf(_(" %s [<arch>] [options] [<program> [<argument>...]]\n"), program_invocation_short_name);
+ else
+ printf(_(" %s [options] [<program> [<argument>...]]\n"), program_invocation_short_name);
+
+ fputs(USAGE_SEPARATOR, stdout);
+ fputs(_("Change the reported architecture and set personality flags.\n"), stdout);
+
+ fputs(USAGE_OPTIONS, stdout);
+ fputs(_(" -B, --32bit turns on ADDR_LIMIT_32BIT\n"), stdout);
+ fputs(_(" -F, --fdpic-funcptrs makes function pointers point to descriptors\n"), stdout);
+ fputs(_(" -I, --short-inode turns on SHORT_INODE\n"), stdout);
+ fputs(_(" -L, --addr-compat-layout changes the way virtual memory is allocated\n"), stdout);
+ fputs(_(" -R, --addr-no-randomize disables randomization of the virtual address space\n"), stdout);
+ fputs(_(" -S, --whole-seconds turns on WHOLE_SECONDS\n"), stdout);
+ fputs(_(" -T, --sticky-timeouts turns on STICKY_TIMEOUTS\n"), stdout);
+ fputs(_(" -X, --read-implies-exec turns on READ_IMPLIES_EXEC\n"), stdout);
+ fputs(_(" -Z, --mmap-page-zero turns on MMAP_PAGE_ZERO\n"), stdout);
+ fputs(_(" -3, --3gb limits the used address space to a maximum of 3 GB\n"), stdout);
+ fputs(_(" --4gb ignored (for backward compatibility only)\n"), stdout);
+ fputs(_(" --uname-2.6 turns on UNAME26\n"), stdout);
+ fputs(_(" -v, --verbose say what options are being switched on\n"), stdout);
+
+ if (!archwrapper)
+ fputs(_(" --list list settable architectures, and exit\n"), stdout);
+
+ fputs(USAGE_SEPARATOR, stdout);
+ printf(USAGE_HELP_OPTIONS(26));
+ printf(USAGE_MAN_TAIL("setarch(8)"));
+
+ exit(EXIT_SUCCESS);
+}
+
+/*
+ * Returns inilialized list of all available execution domains.
+ */
+static struct arch_domain *init_arch_domains(void)
+{
+ struct utsname un;
+ size_t i;
+
+ static struct arch_domain transitions[] =
+ {
+ {UNAME26, "uname26", NULL},
+ {PER_LINUX32, "linux32", NULL},
+ {PER_LINUX, "linux64", NULL},
+#if defined(__powerpc__) || defined(__powerpc64__)
+# ifdef __BIG_ENDIAN__
+ {PER_LINUX32, "ppc32", "ppc"},
+ {PER_LINUX32, "ppc", "ppc"},
+ {PER_LINUX, "ppc64", "ppc64"},
+ {PER_LINUX, "ppc64pseries", "ppc64"},
+ {PER_LINUX, "ppc64iseries", "ppc64"},
+# else
+ {PER_LINUX32, "ppc32", "ppcle"},
+ {PER_LINUX32, "ppc", "ppcle"},
+ {PER_LINUX32, "ppc32le", "ppcle"},
+ {PER_LINUX32, "ppcle", "ppcle"},
+ {PER_LINUX, "ppc64le", "ppc64le"},
+# endif
+#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(__hppa__)
+ {PER_LINUX32, "parisc32", "parisc"},
+ {PER_LINUX32, "parisc", "parisc"},
+ {PER_LINUX, "parisc64", "parisc64"},
+#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"},
+ {PER_LINUX, "alphaev5", "alpha"},
+ {PER_LINUX, "alphaev56", "alpha"},
+ {PER_LINUX, "alphaev6", "alpha"},
+ {PER_LINUX, "alphaev67", "alpha"},
+#endif
+ /* place holder, will be filled up at runtime */
+ {-1, NULL, NULL},
+ {-1, NULL, NULL}
+ };
+
+ /* Add the trivial transition {PER_LINUX, machine, machine} if no
+ * such target_arch is hardcoded yet. */
+ uname(&un);
+ for (i = 0; transitions[i].perval >= 0; i++)
+ if (!strcmp(un.machine, transitions[i].target_arch))
+ break;
+ if (transitions[i].perval < 0) {
+ unsigned long wrdsz = CHAR_BIT * sizeof(void *);
+ if (wrdsz == 32 || wrdsz == 64) {
+ /* fill up the place holder */
+ transitions[i].perval = wrdsz == 32 ? PER_LINUX32 : PER_LINUX;
+ transitions[i].target_arch = un.machine;
+ transitions[i].result_arch = un.machine;
+ }
+ }
+
+ return transitions;
+}
+
+/*
+ * List all execution domains from transitions
+ */
+static void list_arch_domains(struct arch_domain *doms)
+{
+ struct arch_domain *d;
+
+ for (d = doms; d->target_arch != NULL; d++)
+ printf("%s\n", d->target_arch);
+}
+
+static struct arch_domain *get_arch_domain(struct arch_domain *doms, const char *pers)
+{
+ struct arch_domain *d;
+
+ for (d = doms; d->perval >= 0; d++) {
+ if (!strcmp(pers, d->target_arch))
+ break;
+ }
+
+ return !d || d->perval < 0 ? NULL : d;
+}
+
+static void verify_arch_domain(struct arch_domain *dom, const char *wanted)
+{
+ struct utsname un;
+
+ if (!dom || !dom->result_arch)
+ return;
+
+ uname(&un);
+ if (strcmp(un.machine, dom->result_arch)) {
+ if (strcmp(dom->result_arch, "i386")
+ || (strcmp(un.machine, "i486")
+ && strcmp(un.machine, "i586")
+ && strcmp(un.machine, "i686")
+ && strcmp(un.machine, "athlon")))
+ errx(EXIT_FAILURE, _("Kernel cannot set architecture to %s"), wanted);
+ }
+}
+
+int main(int argc, char *argv[])
+{
+ const char *arch = NULL;
+ unsigned long options = 0;
+ int verbose = 0;
+ int archwrapper;
+ int c;
+ struct arch_domain *doms, *target;
+ unsigned long pers_value = 0;
+ char *shell = NULL, *shell_arg = NULL;
+
+ /* Options without equivalent short options */
+ enum {
+ OPT_4GB = CHAR_MAX + 1,
+ OPT_UNAME26,
+ OPT_LIST
+ };
+
+ /* Options --3gb and --4gb are for compatibility with an old
+ * Debian setarch implementation. */
+ static const struct option longopts[] = {
+ {"help", no_argument, NULL, 'h'},
+ {"version", no_argument, NULL, 'V'},
+ {"verbose", no_argument, NULL, 'v'},
+ {"addr-no-randomize", no_argument, NULL, 'R'},
+ {"fdpic-funcptrs", no_argument, NULL, 'F'},
+ {"mmap-page-zero", no_argument, NULL, 'Z'},
+ {"addr-compat-layout", no_argument, NULL, 'L'},
+ {"read-implies-exec", no_argument, NULL, 'X'},
+ {"32bit", no_argument, NULL, 'B'},
+ {"short-inode", no_argument, NULL, 'I'},
+ {"whole-seconds", no_argument, NULL, 'S'},
+ {"sticky-timeouts", no_argument, NULL, 'T'},
+ {"3gb", no_argument, NULL, '3'},
+ {"4gb", no_argument, NULL, OPT_4GB},
+ {"uname-2.6", no_argument, NULL, OPT_UNAME26},
+ {"list", no_argument, NULL, OPT_LIST},
+ {NULL, 0, NULL, 0}
+ };
+
+ setlocale(LC_ALL, "");
+ bindtextdomain(PACKAGE, LOCALEDIR);
+ textdomain(PACKAGE);
+ atexit(close_stdout);
+
+ if (argc < 1) {
+ warnx(_("Not enough arguments"));
+ errtryhelp(EXIT_FAILURE);
+ }
+ archwrapper = strcmp(program_invocation_short_name, "setarch") != 0;
+ if (archwrapper) {
+ arch = program_invocation_short_name; /* symlinks to setarch */
+
+ /* Don't use ifdef sparc here, we get "Unrecognized architecture"
+ * error message later if necessary */
+ if (strcmp(arch, "sparc32bash") == 0) {
+ shell = "/bin/bash";
+ shell_arg = "";
+ goto set_arch;
+ }
+ } else {
+ if (1 < argc && *argv[1] != '-') {
+ arch = argv[1];
+ argv[1] = argv[0]; /* for getopt_long() to get the program name */
+ argv++;
+ argc--;
+ }
+ }
+
+ while ((c = getopt_long(argc, argv, "+hVv3BFILRSTXZ", longopts, NULL)) != -1) {
+ switch (c) {
+ case 'h':
+ usage(archwrapper);
+ break;
+ case 'V':
+ printf(UTIL_LINUX_VERSION);
+ return EXIT_SUCCESS;
+ case 'v':
+ verbose = 1;
+ break;
+ case 'R':
+ turn_on(ADDR_NO_RANDOMIZE, options);
+ break;
+ case 'F':
+ turn_on(FDPIC_FUNCPTRS, options);
+ break;
+ case 'Z':
+ turn_on(MMAP_PAGE_ZERO, options);
+ break;
+ case 'L':
+ turn_on(ADDR_COMPAT_LAYOUT, options);
+ break;
+ case 'X':
+ turn_on(READ_IMPLIES_EXEC, options);
+ break;
+ case 'B':
+ turn_on(ADDR_LIMIT_32BIT, options);
+ break;
+ case 'I':
+ turn_on(SHORT_INODE, options);
+ break;
+ case 'S':
+ turn_on(WHOLE_SECONDS, options);
+ break;
+ case 'T':
+ turn_on(STICKY_TIMEOUTS, options);
+ break;
+ case '3':
+ turn_on(ADDR_LIMIT_3GB, options);
+ break;
+ case OPT_4GB: /* just ignore this one */
+ break;
+ case OPT_UNAME26:
+ turn_on(UNAME26, options);
+ break;
+ case OPT_LIST:
+ if (!archwrapper) {
+ list_arch_domains(init_arch_domains());
+ return EXIT_SUCCESS;
+ } else
+ warnx(_("unrecognized option '--list'"));
+ /* fallthrough */
+ default:
+ errtryhelp(EXIT_FAILURE);
+ }
+ }
+
+ if (!arch && !options)
+ errx(EXIT_FAILURE, _("no architecture argument or personality flags specified"));
+
+ argc -= optind;
+ argv += optind;
+
+set_arch:
+ /* get execution domain (architecture) */
+ if (arch) {
+ doms = init_arch_domains();
+ target = get_arch_domain(doms, arch);
+
+ if (!target)
+ errx(EXIT_FAILURE, _("%s: Unrecognized architecture"), arch);
+ pers_value = target->perval;
+ }
+
+ /* add personality flags */
+ pers_value |= options;
+
+ /* call kernel */
+ if (personality(pers_value) < 0) {
+ /*
+ * Depending on architecture and kernel version, personality
+ * syscall is either capable or incapable of returning an error.
+ * If the return value is not an error, then it's the previous
+ * personality value, which can be an arbitrary value
+ * undistinguishable from an error value.
+ * To make things clear, a second call is needed.
+ */
+ if (personality(pers_value) < 0)
+ err(EXIT_FAILURE, _("failed to set personality to %s"), arch);
+ }
+
+ /* make sure architecture is set as expected */
+ if (arch)
+ verify_arch_domain(target, arch);
+
+ if (!argc) {
+ shell = "/bin/sh";
+ shell_arg = "-sh";
+ }
+ if (verbose) {
+ printf(_("Execute command `%s'.\n"), shell ? shell : argv[0]);
+ /* flush all output streams before exec */
+ fflush(NULL);
+ }
+
+ /* Execute shell */
+ if (shell) {
+ execl(shell, shell_arg, NULL);
+ errexec(shell);
+ }
+
+ /* Execute on command line specified command */
+ execvp(argv[0], argv);
+ errexec(argv[0]);
+}
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