simple test case:
$ cat test.c
#include <stdio.h>
#include <linux/personality.h>
int main(int argc, char *argv[])
{
printf("personality: %#x\n", personality(-1));
if (argc == 1) {
personality(ADDR_NO_RANDOMIZE | PER_LINUX_32BIT);
printf("personality: %#x\n", personality(-1));
argv[1] = "-x";
argv[2] = NULL;
execv(argv[0], argv);
}
return 0;
}
running on a s390 (31bit) system fails:
$ uname -a
Linux lgentoo1 3.4.10 #1 SMP Mon Aug 27 17:24:12 EDT 2012 s390 2084 IBM GNU/Linux
$ ./a.out
personality: 0
personality: 0x840000
personality: 0
running on a s390x (64bit) system works fine:
$ uname -a
Linux lgentoo2 3.4.10 #1 SMP Mon Aug 27 17:28:05 EDT 2012 s390x 2084 IBM GNU/Linux
$ ./a.out
personality: 0
personality: 0x840000
personality: 0x840000
-mike
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