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setarch: add support for '-R' (disable randomization)

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This commit adds support for the -R flag of setarch, which disables
randomization of the virtual address space.

function                                             old     new   delta
setarch_main                                         115     150     +35
packed_usage                                       30664   30651     -13

Signed-off-by: Jan Heylen <heyleke@gmail.com>
Signed-off-by: Thomas De Schampheleire <thomas.de.schampheleire@gmail.com>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This commit is contained in:
Denys Vlasenko
2015-10-19 23:26:50 +02:00
parent 0506e292b5
commit f2ccefb946
4 changed files with 39 additions and 29 deletions
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54
util-linux/setarch.c
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@ -6,13 +6,30 @@
*
* Licensed under GPLv2 or later, see file LICENSE in this source tree.
*/
//config:config SETARCH
//config: bool "setarch"
//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...).
//applet:IF_SETARCH(APPLET(setarch, BB_DIR_BIN, BB_SUID_DROP))
//applet:IF_SETARCH(APPLET_ODDNAME(linux32, setarch, BB_DIR_BIN, BB_SUID_DROP, linux32))
//applet:IF_SETARCH(APPLET_ODDNAME(linux64, setarch, BB_DIR_BIN, BB_SUID_DROP, linux64))
//kbuild:lib-$(CONFIG_SETARCH) += setarch.o
//usage:#define setarch_trivial_usage
//usage: "personality PROG ARGS"
//usage: "PERSONALITY [-R] PROG ARGS"
//usage:#define setarch_full_usage "\n\n"
//usage: "Personality may be:\n"
//usage: " linux32 Set 32bit uname emulation\n"
//usage: " linux64 Set 64bit uname emulation"
//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 ""
@ -20,14 +37,18 @@
//usage:#define linux64_trivial_usage NOUSAGE_STR
//usage:#define linux64_full_usage ""
#include "libbb.h"
#include <sys/personality.h>
#include "libbb.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)
{
int pers;
unsigned opts;
unsigned long pers;
/* Figure out what personality we are supposed to switch to ...
* we can be invoked as either:
@ -35,7 +56,7 @@ int setarch_main(int argc UNUSED_PARAM, char **argv)
* argv[0] == "personality"
*/
if (ENABLE_SETARCH && applet_name[0] == 's'
&& argv[1] && strncpy(argv[1], "linux", 5)
&& argv[1] && is_prefixed_with(argv[1], "linux")
) {
applet_name = argv[1];
argv++;
@ -47,15 +68,18 @@ int setarch_main(int argc UNUSED_PARAM, char **argv)
else
bb_show_usage();
argv++;
if (argv[0] == NULL)
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) {
/* Try to execute the program */
BB_EXECVP(argv[0], argv);
}
if (personality(pers) < 0)
bb_perror_msg_and_die("personality(0x%lx)", pers);
bb_simple_perror_msg_and_die(argv[0]);
argv += optind;
if (!argv[0])
(--argv)[0] = (char*)"/bin/sh";
/* Try to execute the program */
BB_EXECVP_or_die(argv);
}