powerpc: Ensure random space between stack and mmaps

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get_random_int() returns the same value within a 1 jiffy interval. This means
that the mmap and stack regions will almost always end up the same distance
apart, making a relative offset based attack possible.

To fix this, shift the randomness we use for the mmap region by 1 bit.

Signed-off-by: Anton Blanchard <anton@samba.org>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>

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Anton Blanchard 2009-02-22 01:50:05 +00:00 • committed by Benjamin Herrenschmidt

parent 912f9ee21c

commit a5adc91a4b

1 changed files with 11 additions and 3 deletions

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arch/powerpc/mm/mmap.c

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