[821] | 1 | /* vi: set sw=4 ts=4: */
|
---|
| 2 | /*
|
---|
[2725] | 3 | * linux32/linux64 allows for changing uname emulation.
|
---|
[821] | 4 | *
|
---|
| 5 | * Copyright 2002 Andi Kleen, SuSE Labs.
|
---|
| 6 | *
|
---|
[2725] | 7 | * Licensed under GPLv2 or later, see file LICENSE in this source tree.
|
---|
[3232] | 8 | */
|
---|
[3621] | 9 | //config:config SETARCH
|
---|
| 10 | //config: bool "setarch"
|
---|
| 11 | //config: default y
|
---|
| 12 | //config: select PLATFORM_LINUX
|
---|
| 13 | //config: help
|
---|
| 14 | //config: The linux32 utility is used to create a 32bit environment for the
|
---|
| 15 | //config: specified program (usually a shell). It only makes sense to have
|
---|
| 16 | //config: this util on a system that supports both 64bit and 32bit userland
|
---|
| 17 | //config: (like amd64/x86, ppc64/ppc, sparc64/sparc, etc...).
|
---|
[821] | 18 |
|
---|
[3621] | 19 | //applet:IF_SETARCH(APPLET(setarch, BB_DIR_BIN, BB_SUID_DROP))
|
---|
| 20 | //applet:IF_SETARCH(APPLET_ODDNAME(linux32, setarch, BB_DIR_BIN, BB_SUID_DROP, linux32))
|
---|
| 21 | //applet:IF_SETARCH(APPLET_ODDNAME(linux64, setarch, BB_DIR_BIN, BB_SUID_DROP, linux64))
|
---|
| 22 |
|
---|
| 23 | //kbuild:lib-$(CONFIG_SETARCH) += setarch.o
|
---|
| 24 |
|
---|
[3232] | 25 | //usage:#define setarch_trivial_usage
|
---|
[3621] | 26 | //usage: "PERSONALITY [-R] PROG ARGS"
|
---|
[3232] | 27 | //usage:#define setarch_full_usage "\n\n"
|
---|
[3621] | 28 | //usage: "PERSONALITY may be:"
|
---|
| 29 | //usage: "\n"" linux32 Set 32bit uname emulation"
|
---|
| 30 | //usage: "\n"" linux64 Set 64bit uname emulation"
|
---|
| 31 | //usage: "\n"
|
---|
| 32 | //usage: "\n"" -R Disable address space randomization"
|
---|
[3232] | 33 | //usage:
|
---|
| 34 | //usage:#define linux32_trivial_usage NOUSAGE_STR
|
---|
| 35 | //usage:#define linux32_full_usage ""
|
---|
| 36 | //usage:
|
---|
| 37 | //usage:#define linux64_trivial_usage NOUSAGE_STR
|
---|
| 38 | //usage:#define linux64_full_usage ""
|
---|
| 39 |
|
---|
[3621] | 40 | #include "libbb.h"
|
---|
[821] | 41 | #include <sys/personality.h>
|
---|
| 42 |
|
---|
[3621] | 43 | #ifndef ADDR_NO_RANDOMIZE
|
---|
| 44 | # define ADDR_NO_RANDOMIZE 0x0040000
|
---|
| 45 | #endif
|
---|
[821] | 46 |
|
---|
[2725] | 47 | int setarch_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
|
---|
| 48 | int setarch_main(int argc UNUSED_PARAM, char **argv)
|
---|
[821] | 49 | {
|
---|
[3621] | 50 | unsigned opts;
|
---|
| 51 | unsigned long pers;
|
---|
[821] | 52 |
|
---|
| 53 | /* Figure out what personality we are supposed to switch to ...
|
---|
| 54 | * we can be invoked as either:
|
---|
[2725] | 55 | * argv[0],argv[1] == "setarch","personality"
|
---|
| 56 | * argv[0] == "personality"
|
---|
[821] | 57 | */
|
---|
[2725] | 58 | if (ENABLE_SETARCH && applet_name[0] == 's'
|
---|
[3621] | 59 | && argv[1] && is_prefixed_with(argv[1], "linux")
|
---|
[2725] | 60 | ) {
|
---|
| 61 | applet_name = argv[1];
|
---|
| 62 | argv++;
|
---|
| 63 | }
|
---|
| 64 | if (applet_name[5] == '6') /* linux64 */
|
---|
[821] | 65 | pers = PER_LINUX;
|
---|
[2725] | 66 | else if (applet_name[5] == '3') /* linux32 */
|
---|
[821] | 67 | pers = PER_LINUX32;
|
---|
[2725] | 68 | else
|
---|
| 69 | bb_show_usage();
|
---|
[821] | 70 |
|
---|
[3621] | 71 | opts = getopt32(argv, "+R"); /* '+': stop at first non-option */
|
---|
| 72 | if (opts)
|
---|
| 73 | pers |= ADDR_NO_RANDOMIZE;
|
---|
[821] | 74 |
|
---|
| 75 | /* Try to set personality */
|
---|
[3621] | 76 | if (personality(pers) < 0)
|
---|
| 77 | bb_perror_msg_and_die("personality(0x%lx)", pers);
|
---|
[821] | 78 |
|
---|
[3621] | 79 | argv += optind;
|
---|
| 80 | if (!argv[0])
|
---|
| 81 | (--argv)[0] = (char*)"/bin/sh";
|
---|
| 82 |
|
---|
| 83 | /* Try to execute the program */
|
---|
| 84 | BB_EXECVP_or_die(argv);
|
---|
[821] | 85 | }
|
---|