This is a note to let you know that I've just added the patch titled
powerpc: ppc64 address space capped at 32TB, mmap randomisation disabled
to the 3.12-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
powerpc-ppc64-address-space-capped-at-32tb-mmap-randomisation-disabled.patch
and it can be found in the queue-3.12 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 5a049f14902982c26538250bdc8d54156d357252 Mon Sep 17 00:00:00 2001
From: Anton Blanchard <anton@xxxxxxxxx>
Date: Mon, 18 Nov 2013 14:55:28 +1100
Subject: powerpc: ppc64 address space capped at 32TB, mmap randomisation disabled
From: Anton Blanchard <anton@xxxxxxxxx>
commit 5a049f14902982c26538250bdc8d54156d357252 upstream.
Commit fba2369e6ceb (mm: use vm_unmapped_area() on powerpc architecture)
has a bug in slice_scan_available() where we compare an unsigned long
(high_slices) against a shifted int. As a result, comparisons against
the top 32 bits of high_slices (representing the top 32TB) always
returns 0 and the top of our mmap region is clamped at 32TB
This also breaks mmap randomisation since the randomised address is
always up near the top of the address space and it gets clamped down
to 32TB.
Signed-off-by: Anton Blanchard <anton@xxxxxxxxx>
Acked-by: Michel Lespinasse <walken@xxxxxxxxxx>
Signed-off-by: Benjamin Herrenschmidt <benh@xxxxxxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
arch/powerpc/mm/slice.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/arch/powerpc/mm/slice.c
+++ b/arch/powerpc/mm/slice.c
@@ -258,7 +258,7 @@ static bool slice_scan_available(unsigne
slice = GET_HIGH_SLICE_INDEX(addr);
*boundary_addr = (slice + end) ?
((slice + end) << SLICE_HIGH_SHIFT) : SLICE_LOW_TOP;
- return !!(available.high_slices & (1u << slice));
+ return !!(available.high_slices & (1ul << slice));
}
}
Patches currently in stable-queue which might be from anton@xxxxxxxxx are
queue-3.12/powerpc-ppc64-address-space-capped-at-32tb-mmap-randomisation-disabled.patch
queue-3.12/powerpc-pseries-duplicate-dtl-entries-sometimes-sent-to-userspace.patch
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