linux/arch/sparc
David S. Miller 5a0efea09f sparc64: Sharpen address space randomization calculations.
A recent patch to the x86 randomization code caused me to take
a quick look at what we do on sparc64, and in doing so I noticed
that we sometimes calculate a non-page-aligned randomization value
and stick it into mmap_base.

I also noticed that since I copied the logic over from PowerPC,
the powerpc code has tweaked the randomization ranges in ways that
would benefit us as well.

For one thing, we should allow up to at least 8MB of randomization
otherwise huge-page regions when HPAGE_SIZE is 4MB never randomize
at all.

And on the 64-bit side we were using up to 4GB.  Tone it down to
1GB as 4GB can result in a lot of address space wastage.

Finally, make sure all computations are unsigned.

Signed-off-by: David S. Miller <davem@davemloft.net>
2011-03-16 18:19:12 -07:00
..
boot sparc32: added U-Boot build target: uImage 2011-03-16 18:19:04 -07:00
configs defconfig reduction 2010-08-14 22:26:53 +02:00
include/asm sparc32: add irq + smp declarations to headers 2011-03-16 18:19:08 -07:00
kernel sparc64: Sharpen address space randomization calculations. 2011-03-16 18:19:12 -07:00
lib Merge branch 'core-locking-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip 2011-03-15 18:28:30 -07:00
math-emu Revert "endian: #define __BYTE_ORDER" 2010-05-26 08:30:15 -07:00
mm thp: pte alloc trans splitting 2011-01-13 17:32:40 -08:00
oprofile sparc: using HZ needs an include of linux/param.h 2009-10-05 00:46:08 -07:00
prom sparc32: remove tick14.c 2011-03-16 18:19:08 -07:00
Kconfig sparc32: added U-Boot build target: uImage 2011-03-16 18:19:04 -07:00
Kconfig.debug sparc: Kill user copy check code. 2010-08-09 00:45:46 -07:00
Makefile sparc32: added U-Boot build target: uImage 2011-03-16 18:19:04 -07:00