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-rw-r--r--sys-utils/setarch.c351
1 files changed, 351 insertions, 0 deletions
diff --git a/sys-utils/setarch.c b/sys-utils/setarch.c
new file mode 100644
index 0000000..d13cdd6
--- /dev/null
+++ b/sys-utils/setarch.c
@@ -0,0 +1,351 @@
+/*
+ * 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 <syscall.h>
+#include <linux/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"
+
+#define set_pers(pers) ((long)syscall(SYS_personality, pers))
+
+/* Options without equivalent short options */
+enum {
+ OPT_4GB = CHAR_MAX + 1,
+ OPT_UNAME26
+};
+
+#define turn_on(_flag, _opts) \
+ do { \
+ (_opts) |= _flag; \
+ if (verbose) \
+ printf(_("Switching on %s.\n"), #_flag); \
+ } while(0)
+
+
+#if !HAVE_DECL_UNAME26
+# define UNAME26 0x0020000
+#endif
+#if !HAVE_DECL_ADDR_NO_RANDOMIZE
+# define ADDR_NO_RANDOMIZE 0x0040000
+#endif
+#if !HAVE_DECL_FDPIC_FUNCPTRS
+# define FDPIC_FUNCPTRS 0x0080000
+#endif
+#if !HAVE_DECL_MMAP_PAGE_ZERO
+# define MMAP_PAGE_ZERO 0x0100000
+#endif
+#if !HAVE_DECL_ADDR_COMPAT_LAYOUT
+# define ADDR_COMPAT_LAYOUT 0x0200000
+#endif
+#if !HAVE_DECL_READ_IMPLIES_EXEC
+# define READ_IMPLIES_EXEC 0x0400000
+#endif
+#if !HAVE_DECL_ADDR_LIMIT_32BIT
+# define ADDR_LIMIT_32BIT 0x0800000
+#endif
+#if !HAVE_DECL_SHORT_INODE
+# define SHORT_INODE 0x1000000
+#endif
+#if !HAVE_DECL_WHOLE_SECONDS
+# define WHOLE_SECONDS 0x2000000
+#endif
+#if !HAVE_DECL_STICKY_TIMEOUTS
+# define STICKY_TIMEOUTS 0x4000000
+#endif
+#if !HAVE_DECL_ADDR_LIMIT_3GB
+# define ADDR_LIMIT_3GB 0x8000000
+#endif
+
+static void __attribute__((__noreturn__))
+show_help(void)
+{
+ printf(USAGE_HEADER);
+ printf(_(" %s%s [options] [program [program arguments]]\n"),
+ program_invocation_short_name,
+ !strcmp(program_invocation_short_name, "setarch") ? " <arch>" : "");
+
+ printf(USAGE_OPTIONS);
+ printf(_(
+ " -v, --verbose says what options are being switched on\n"
+ " -R, --addr-no-randomize disables randomization of the virtual address space\n"
+ " -F, --fdpic-funcptrs makes function pointers point to descriptors\n"
+ " -Z, --mmap-page-zero turns on MMAP_PAGE_ZERO\n"
+ " -L, --addr-compat-layout changes the way virtual memory is allocated\n"
+ " -X, --read-implies-exec turns on READ_IMPLIES_EXEC\n"
+ " -B, --32bit turns on ADDR_LIMIT_32BIT\n"
+ " -I, --short-inode turns on SHORT_INODE\n"
+ " -S, --whole-seconds turns on WHOLE_SECONDS\n"
+ " -T, --sticky-timeouts turns on STICKY_TIMEOUTS\n"
+ " -3, --3gb limits the used address space to a maximum of 3 GB\n"
+ " --4gb ignored (for backward compatibility only)\n"
+ " --uname-2.6 turns on UNAME26\n"));
+
+ printf(USAGE_SEPARATOR);
+ printf(USAGE_HELP);
+ printf(USAGE_VERSION);
+ printf(USAGE_MAN_TAIL("setarch(8)"));
+
+ exit(EXIT_SUCCESS);
+}
+
+static void __attribute__((__noreturn__))
+show_usage(const char *s)
+{
+ if (s)
+ errx(EXIT_FAILURE, _("%s\nTry `%s --help' for more information."), s, program_invocation_short_name);
+ else
+ errx(EXIT_FAILURE, _("Try `%s --help' for more information."), program_invocation_short_name);
+}
+
+static void __attribute__((__noreturn__))
+show_version(void)
+{
+ printf(UTIL_LINUX_VERSION);
+ exit(EXIT_SUCCESS);
+}
+
+static int
+set_arch(const char *pers, unsigned long options)
+{
+ struct utsname un;
+ int i;
+ unsigned long pers_value;
+
+ 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(__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
+ {-1, NULL, NULL}
+ };
+
+ for(i = 0; transitions[i].perval >= 0; i++)
+ if(!strcmp(pers, transitions[i].target_arch))
+ break;
+
+ if(transitions[i].perval < 0)
+ errx(EXIT_FAILURE, _("%s: Unrecognized architecture"), pers);
+
+ pers_value = transitions[i].perval | options;
+ if (set_pers(pers_value) == -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")))
+ errx(EXIT_FAILURE, _("%s: Unrecognized architecture"), pers);
+ }
+
+ return 0;
+}
+
+int main(int argc, char *argv[])
+{
+ const char *p;
+ unsigned long options = 0;
+ int verbose = 0;
+ int c;
+
+ /* Options --3gb and --4gb are for compatibitity with an old Debian setarch
+ implementation. */
+ static const struct option longopts[] =
+ {
+ { "help", 0, 0, 'h' },
+ { "version", 0, 0, 'V' },
+ { "verbose", 0, 0, 'v' },
+ { "addr-no-randomize", 0, 0, 'R' },
+ { "fdpic-funcptrs", 0, 0, 'F' },
+ { "mmap-page-zero", 0, 0, 'Z' },
+ { "addr-compat-layout", 0, 0, 'L' },
+ { "read-implies-exec", 0, 0, 'X' },
+ { "32bit", 0, 0, 'B' },
+ { "short-inode", 0, 0, 'I' },
+ { "whole-seconds", 0, 0, 'S' },
+ { "sticky-timeouts", 0, 0, 'T' },
+ { "3gb", 0, 0, '3' },
+ { "4gb", 0, 0, OPT_4GB },
+ { "uname-2.6", 0, 0, OPT_UNAME26 },
+ { NULL, 0, 0, 0 }
+ };
+
+ setlocale(LC_ALL, "");
+ bindtextdomain(PACKAGE, LOCALEDIR);
+ textdomain(PACKAGE);
+ atexit(close_stdout);
+
+ if (argc < 1)
+ show_usage(_("Not enough arguments"));
+
+ p = program_invocation_short_name;
+ if (!strcmp(p, "setarch")) {
+ argc--;
+ if (argc < 1)
+ show_usage(_("Not enough arguments"));
+ p = argv[1];
+ argv[1] = argv[0]; /* for getopt_long() to get the program name */
+ argv++;
+ if (!strcmp(p, "-h") || !strcmp(p, "--help"))
+ show_help();
+ else if (!strcmp(p, "-V") || !strcmp(p, "--version"))
+ show_version();
+ }
+ #if defined(__sparc64__) || defined(__sparc__)
+ if (!strcmp(p, "sparc32bash")) {
+ if (set_arch(p, 0L))
+ err(EXIT_FAILURE, _("Failed to set personality to %s"), p);
+ execl("/bin/bash", NULL);
+ err(EXIT_FAILURE, "/bin/bash");
+ }
+ #endif
+
+ while ((c = getopt_long(argc, argv, "+hVv3BFILRSTXZ", longopts, NULL)) != -1) {
+ switch (c) {
+ case 'h':
+ show_help();
+ break;
+ case 'V':
+ show_version();
+ break;
+ 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;
+ default:
+ show_usage(NULL);
+ }
+ }
+
+ argc -= optind;
+ argv += optind;
+
+ if (set_arch(p, options))
+ err(EXIT_FAILURE, _("Failed to set personality to %s"), p);
+
+ if (!argc) {
+ execl("/bin/sh", "-sh", NULL);
+ err(EXIT_FAILURE, "/bin/sh");
+ }
+
+ execvp(argv[0], argv);
+ err(EXIT_FAILURE, "%s", argv[0]);
+ return EXIT_FAILURE;
+}
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