Library address randomization

[Ricardo Rolim]

Hi there,

Apparently I'm not getting library address randomization for any
programs (compiled or not 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 results out of Ubuntu
8.10. Here's one example:

[ricardo at localhost ~]$ cat /proc/sys/kernel/randomize_va_space
2
[ricardo at localhost ~]$ cat /proc/sys/kernel/exec-shield
1
[ricardo at localhost ~]$ echo 'int main(){}' > dummy.c
[ricardo at localhost ~]$ gcc -fpie -pie -o dummy dummy.c
[ricardo at localhost ~]$ ldd dummy
	linux-gate.so.1 =>  (0x00130000)
	libc.so.6 => /lib/libc.so.6 (0x00133000)
	/lib/ld-linux.so.2 (0x00110000)
[ricardo at localhost ~]$ ldd dummy
	linux-gate.so.1 =>  (0x00130000)
	libc.so.6 => /lib/libc.so.6 (0x00133000)
	/lib/ld-linux.so.2 (0x00110000)

Am I missing something? This is the third mailing list that I'm
trying. Thanks a lot :)