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