On Mon, Jan 26, 2009 at 12:14:10AM -0300, Ricardo Rolim wrote:
> 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@localhost ~]$ cat /proc/sys/kernel/randomize_va_space
> 2
> [ricardo@localhost ~]$ cat /proc/sys/kernel/exec-shield
> 1
> [ricardo@localhost ~]$ echo 'int main(){}' > dummy.c
> [ricardo@localhost ~]$ gcc -fpie -pie -o dummy dummy.c
> [ricardo@localhost ~]$ ldd dummy
> linux-gate.so.1 => (0x00130000)
> libc.so.6 => /lib/libc.so.6 (0x00133000)
> /lib/ld-linux.so.2 (0x00110000)
> [ricardo@localhost ~]$ ldd dummy
> linux-gate.so.1 => (0x00130000)
> libc.so.6 => /lib/libc.so.6 (0x00133000)
> /lib/ld-linux.so.2 (0x00110000)
What kernel version are you running? Kyle fixed up some
of this code last week.
Dave
--
http://www.codemonkey.org.uk
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