/* vi: set sw=4 ts=4: */ /* * linux32/linux64 allows for changing uname emulation. * * Copyright 2002 Andi Kleen, SuSE Labs. * * Licensed under GPLv2 or later, see file LICENSE in this source tree. */ //config:config SETARCH //config: bool "setarch (3.4 kb)" //config: default y //config: select PLATFORM_LINUX //config: help //config: The linux32 utility is used to create a 32bit environment for the //config: specified program (usually a shell). It only makes sense to have //config: this util on a system that supports both 64bit and 32bit userland //config: (like amd64/x86, ppc64/ppc, sparc64/sparc, etc...). //config: //config:config LINUX32 //config: bool "linux32 (3.2 kb)" //config: default y //config: select PLATFORM_LINUX //config: help //config: Alias to "setarch linux32". //config: //config:config LINUX64 //config: bool "linux64 (3.2 kb)" //config: default y //config: select PLATFORM_LINUX //config: help //config: Alias to "setarch linux64". //applet:IF_SETARCH(APPLET_NOEXEC(setarch, setarch, BB_DIR_BIN, BB_SUID_DROP, setarch)) // APPLET_NOEXEC:name main location suid_type help //applet:IF_LINUX32(APPLET_NOEXEC(linux32, setarch, BB_DIR_BIN, BB_SUID_DROP, linux32)) //applet:IF_LINUX64(APPLET_NOEXEC(linux64, setarch, BB_DIR_BIN, BB_SUID_DROP, linux64)) //kbuild:lib-$(CONFIG_SETARCH) += setarch.o //kbuild:lib-$(CONFIG_LINUX32) += setarch.o //kbuild:lib-$(CONFIG_LINUX64) += setarch.o //usage:#define setarch_trivial_usage //usage: "PERSONALITY [-R] PROG ARGS" //usage:#define setarch_full_usage "\n\n" //usage: "PERSONALITY may be:" //usage: "\n"" linux32 Set 32bit uname emulation" //usage: "\n"" linux64 Set 64bit uname emulation" //usage: "\n" //usage: "\n"" -R Disable address space randomization" //usage: //usage:#define linux32_trivial_usage NOUSAGE_STR //usage:#define linux32_full_usage "" //usage: //usage:#define linux64_trivial_usage NOUSAGE_STR //usage:#define linux64_full_usage "" #include "libbb.h" #include <sys/personality.h> #ifndef ADDR_NO_RANDOMIZE # define ADDR_NO_RANDOMIZE 0x0040000 #endif int setarch_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE; int setarch_main(int argc UNUSED_PARAM, char **argv) { unsigned opts; unsigned long pers; /* Figure out what personality we are supposed to switch to ... * we can be invoked as either: * argv[0],argv[1] == "setarch","personality" * argv[0] == "personality" */ if (ENABLE_SETARCH && applet_name[0] == 's' && argv[1] && is_prefixed_with(argv[1], "linux") ) { argv++; applet_name = argv[0]; } if ((!ENABLE_SETARCH && !ENABLE_LINUX32) || applet_name[5] == '6') /* linux64 */ pers = PER_LINUX; else if ((!ENABLE_SETARCH && !ENABLE_LINUX64) || applet_name[5] == '3') /* linux32 */ pers = PER_LINUX32; else bb_show_usage(); opts = getopt32(argv, "+R"); /* '+': stop at first non-option */ if (opts) pers |= ADDR_NO_RANDOMIZE; /* Try to set personality */ if (personality(pers) < 0) bb_perror_msg_and_die("personality(0x%lx)", pers); argv += optind; if (!argv[0]) (--argv)[0] = (char*)"/bin/sh"; /* Try to execute the program */ BB_EXECVP_or_die(argv); }