[grsec] randomize_va_space and PaX ASLR : bad interactions ?

[Tristan de Cacqueray]

 Hi,

I think there is a strange behavior between those two randomize scheme.


I have a gentoo hardened with linux-2.6.14-hardened-r1, pax aslr
activated (for both stack and mmap segments).

The thing is when I set kernel.randomize_va_space = 0, PaX seems to
be disable, and the stack's base address is 0x5fffffff.

When kernel.randomize_va_space is set to 1, pax is functioning
(offsets are fully randomize).


Is this a bug ?
Are you aware of any work-around ?

Sorry for my bad English,
and anyway, thanks you for the great job you do.


--
Tristan < tristan.cacqueray at gmail.com>
Epita System Laboratory