Re: [PATCH] x86: Don't randomize stack unless current->personality permits it

From: Chuck Ebbert
Date: Sun Jul 16 2006 - 00:16:55 EST

In-Reply-To: <200607151709.45870.a1426z@xxxxxxxxx>

On Sat, 15 Jul 2006 17:09:45 +0300, Al Boldi wrote:

> Randomization on. Executable runs with 8x blips/hits.
> Randomization off. Executable runs without blips/hits.
> With randomization off, a mere rename causes an 8x-slowdown to occur. Run
> this renamed executable through sh -c ./tstExec, and the slowdown
> disappears. Really weired :)

Does this help at all? I don't have a space heater^W^WPentium IV
to test on.

--- 2.6.18-rc1-nb.orig/arch/i386/kernel/process.c
+++ 2.6.18-rc1-nb/arch/i386/kernel/process.c
@@ -890,5 +890,5 @@ unsigned long arch_align_stack(unsigned
if (randomize_va_space)
sp -= get_random_int() % 8192;
- return sp & ~0xf;
+ return sp & ~0x7f;
"You can't read a newspaper if you can't read." --George W. Bush
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