diff options
| author | Arjan van de Ven <arjan@infradead.org> | 2005-03-04 17:25:13 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-03-04 17:25:13 -0800 |
| commit | ccc875c1d2fe18b50020d501f1005ef46fc55fed (patch) | |
| tree | c537ca25c29dc7eff4eb9d96d4aab41041fffb37 /fs/exec.c | |
| parent | c518b108234a2418fb65a09e6219202eda316d6c (diff) | |
[PATCH] Randomisation: stack randomisation
The patch below replaces the existing 8Kb randomisation of the userspace stack
pointer (which is currently only done for Hyperthreaded P-IVs) with a more
general randomisation over a 64Kb range. 64Kb is not a lot, but it's a start
and once the dust settles we can increase this value to a more agressive
value.
Signed-off-by: Arjan van de Ven <arjan@infradead.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'fs/exec.c')
| -rw-r--r-- | fs/exec.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/fs/exec.c b/fs/exec.c index 694e3c141012..6e505b1b3db6 100644 --- a/fs/exec.c +++ b/fs/exec.c @@ -400,7 +400,8 @@ int setup_arg_pages(struct linux_binprm *bprm, while (i < MAX_ARG_PAGES) bprm->page[i++] = NULL; #else - stack_base = stack_top - MAX_ARG_PAGES * PAGE_SIZE; + stack_base = arch_align_stack(STACK_TOP - MAX_ARG_PAGES*PAGE_SIZE); + stack_base = PAGE_ALIGN(stack_base); bprm->p += stack_base; mm->arg_start = bprm->p; arg_size = stack_top - (PAGE_MASK & (unsigned long) mm->arg_start); |