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setarch: do not try to use non-existent data in argv[]

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This commit is contained in:
Denis Vlasenko 2008-08-23 23:15:17 +00:00
parent 6cd36bc2da
commit 7fe21c69cd
1 changed files with 16 additions and 16 deletions
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32
util-linux/setarch.c
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@ -1,6 +1,6 @@
/* vi: set sw=4 ts=4: */ /* vi: set sw=4 ts=4: */
/* /*
* Linux32/linux64 allows for changing uname emulation. * linux32/linux64 allows for changing uname emulation.
* *
* Copyright 2002 Andi Kleen, SuSE Labs. * Copyright 2002 Andi Kleen, SuSE Labs.
* *
@ -14,32 +14,32 @@
int setarch_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE; int setarch_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
int setarch_main(int argc UNUSED_PARAM, char **argv) int setarch_main(int argc UNUSED_PARAM, char **argv)
{ {
int pers = -1; int pers;
/* Figure out what personality we are supposed to switch to ... /* Figure out what personality we are supposed to switch to ...
* we can be invoked as either: * we can be invoked as either:
* argv[0],argv[1] -> "setarch","personality" * argv[0],argv[1] == "setarch","personality"
* argv[0] -> "personality" * argv[0] == "personality"
*/ */
retry: if (ENABLE_SETARCH && applet_name[0] == 's'
if (argv[0][5] == '6') /* linux64 */ && argv[1] && strncpy(argv[1], "linux", 5)
pers = PER_LINUX; ) {
else if (argv[0][5] == '3') /* linux32 */ applet_name = argv[1];
pers = PER_LINUX32; argv++;
else if (pers == -1 && argv[1] != NULL) {
pers = PER_LINUX32;
++argv;
goto retry;
} }
if (applet_name[5] == '6') /* linux64 */
pers = PER_LINUX;
else if (applet_name[5] == '3') /* linux32 */
pers = PER_LINUX32;
else
bb_show_usage();
/* make user actually gave us something to do */ argv++;
++argv;
if (argv[0] == NULL) if (argv[0] == NULL)
bb_show_usage(); bb_show_usage();
/* Try to set personality */ /* Try to set personality */
if (personality(pers) >= 0) { if (personality(pers) >= 0) {
/* Try to execute the program */ /* Try to execute the program */
BB_EXECVP(argv[0], argv); BB_EXECVP(argv[0], argv);
} }