Re: Library address randomization

["kalgecin () gmail com" <kalgecin () gmail com>]

duno but "cat /proc/sys/kernel/randomize_va_space" should yield 1 for
on and 0 for off. I may be wrong but never heard of 2 in there. try

"echo 1 > /proc/sys/kernel/randomize_va_space"

On 1/23/09, Ricardo Rolim <ricardorolim () hotmail com> wrote:
> Hi there,
>
> Currently I'm using Fedora 10 and apparently I'm not getting any library
> address randomization for programs compiled as PIE. Whereas the binary
> itself, stack and heap are randomly getting their addresses changed from one
> execution to the next, the library stands still at a predictable location.
> Strangely enough I've got the expected result out of Ubuntu 8.10. This is
> how I'm checking:
>
>       #include
>
> int main() {
>         printf("printf: %p\n", printf);
>         printf("main  : %p\n", main);
> }
>
> [ricardo@localhost ~]$ cat /proc/sys/kernel/randomize_va_space
> 2
> [ricardo@localhost ~]$ cat /proc/sys/kernel/exec-shield
> 1
> [ricardo@localhost ~]$ gcc -fpie -pie -o dummy dummy.c
> [ricardo@localhost ~]$ ./dummy
> printf: 0x17c900
> main  : 0xb7f8851c
> [ricardo@localhost ~]$ ./dummy
> printf: 0x17c900
> main  : 0xb7f5051c
>
> Am I missing something? Thanks a lot :)               
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