| Message ID | 20090222115332.289241697@samba.org (mailing list archive) |
|---|---|
| State | Accepted, archived |
| Commit | 2dadb987e09995b2910c419cdfe2307e66537649 |
| Delegated to: | Benjamin Herrenschmidt |
| Headers | show |
Index: linux-2.6/arch/powerpc/include/asm/elf.h =================================================================== --- linux-2.6.orig/arch/powerpc/include/asm/elf.h 2009-02-20 13:39:05.000000000 +1100 +++ linux-2.6/arch/powerpc/include/asm/elf.h 2009-02-20 13:51:20.000000000 +1100 @@ -270,6 +270,11 @@ int uses_interp); #define VDSO_AUX_ENT(a,b) NEW_AUX_ENT(a,b); +/* 1GB for 64bit, 8MB for 32bit */ +#define STACK_RND_MASK (is_32bit_task() ? \ + (0x7ff >> (PAGE_SHIFT - 12)) : \ + (0x3ffff >> (PAGE_SHIFT - 12))) + #endif /* __KERNEL__ */ /*
At the moment we randomise the stack by 8MB on 32bit and 64bit tasks. Since we have a lot more address space to play with on 64bit, lets do what x86 does and increase that randomisation to 1GB: before: # for i in seq `1 10` ; do sleep 1 & cat /proc/${!}/maps | grep stack; done fffffebc000-fffffed1000 rw-p ffffffeb000 00:00 0 [stack] ffffff5a000-ffffff6f000 rw-p ffffffeb000 00:00 0 [stack] fffffdb2000-fffffdc7000 rw-p ffffffeb000 00:00 0 [stack] fffffd3e000-fffffd53000 rw-p ffffffeb000 00:00 0 [stack] fffffad9000-fffffaee000 rw-p ffffffeb000 00:00 0 [stack] after: # for i in seq `1 10` ; do sleep 1 & cat /proc/${!}/maps | grep stack; done ffff5c27000-ffff5c3c000 rw-p ffffffeb000 00:00 0 [stack] fffebe5e000-fffebe73000 rw-p ffffffeb000 00:00 0 [stack] fffcb298000-fffcb2ad000 rw-p ffffffeb000 00:00 0 [stack] fffc719d000-fffc71b2000 rw-p ffffffeb000 00:00 0 [stack] fffe01af000-fffe01c4000 rw-p ffffffeb000 00:00 0 [stack] Signed-off-by: Anton Blanchard <anton@samba.org> ---