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103 lines
3.0 KiB
C
103 lines
3.0 KiB
C
/* vi: set sw=4 ts=4: */
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/*
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* linux32/linux64 allows for changing uname emulation.
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*
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* Copyright 2002 Andi Kleen, SuSE Labs.
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*
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* Licensed under GPLv2 or later, see file LICENSE in this source tree.
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*/
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//config:config SETARCH
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//config: bool "setarch (3.8 kb)"
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//config: default y
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//config: help
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//config: The linux32 utility is used to create a 32bit environment for the
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//config: specified program (usually a shell). It only makes sense to have
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//config: this util on a system that supports both 64bit and 32bit userland
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//config: (like amd64/x86, ppc64/ppc, sparc64/sparc, etc...).
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//config:
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//config:config LINUX32
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//config: bool "linux32 (3.6 kb)"
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//config: default y
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//config: help
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//config: Alias to "setarch linux32".
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//config:
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//config:config LINUX64
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//config: bool "linux64 (3.5 kb)"
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//config: default y
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//config: help
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//config: Alias to "setarch linux64".
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//applet:IF_SETARCH(APPLET_NOEXEC(setarch, setarch, BB_DIR_BIN, BB_SUID_DROP, setarch))
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// APPLET_NOEXEC:name main location suid_type help
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//applet:IF_LINUX32(APPLET_NOEXEC(linux32, setarch, BB_DIR_BIN, BB_SUID_DROP, linux32))
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//applet:IF_LINUX64(APPLET_NOEXEC(linux64, setarch, BB_DIR_BIN, BB_SUID_DROP, linux64))
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//kbuild:lib-$(CONFIG_SETARCH) += setarch.o
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//kbuild:lib-$(CONFIG_LINUX32) += setarch.o
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//kbuild:lib-$(CONFIG_LINUX64) += setarch.o
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//usage:#define setarch_trivial_usage
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//usage: "PERSONALITY [-R] PROG ARGS"
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//usage:#define setarch_full_usage "\n\n"
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//usage: "PERSONALITY may be:"
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//usage: "\n"" linux32 Set 32bit uname emulation"
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//usage: "\n"" linux64 Set 64bit uname emulation"
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//usage: "\n"
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//usage: "\n"" -R Disable address space randomization"
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//usage:
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//usage:#define linux32_trivial_usage NOUSAGE_STR
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//usage:#define linux32_full_usage ""
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//usage:
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//usage:#define linux64_trivial_usage NOUSAGE_STR
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//usage:#define linux64_full_usage ""
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#include "libbb.h"
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#include <sys/personality.h>
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#ifndef ADDR_NO_RANDOMIZE
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# define ADDR_NO_RANDOMIZE 0x0040000
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#endif
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int setarch_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
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int setarch_main(int argc UNUSED_PARAM, char **argv)
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{
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unsigned opts;
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unsigned long pers;
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/* Figure out what personality we are supposed to switch to ...
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* we can be invoked as either:
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* argv[0],argv[1] == "setarch","personality"
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* argv[0] == "personality"
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*/
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if (ENABLE_SETARCH && applet_name[0] == 's'
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&& argv[1] && is_prefixed_with(argv[1], "linux")
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) {
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argv++;
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applet_name = argv[0];
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}
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if ((!ENABLE_SETARCH && !ENABLE_LINUX32) || applet_name[5] == '6')
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/* linux64 */
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pers = PER_LINUX;
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else
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if ((!ENABLE_SETARCH && !ENABLE_LINUX64) || applet_name[5] == '3')
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/* linux32 */
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pers = PER_LINUX32;
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else
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bb_show_usage();
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opts = getopt32(argv, "+R"); /* '+': stop at first non-option */
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if (opts)
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pers |= ADDR_NO_RANDOMIZE;
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/* Try to set personality */
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if (personality(pers) < 0)
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bb_perror_msg_and_die("personality(0x%lx)", pers);
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argv += optind;
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if (!argv[0])
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(--argv)[0] = (char*)"/bin/sh";
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/* Try to execute the program */
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BB_EXECVP_or_die(argv);
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}
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