path: root/arch/powerpc
diff options
authorAnton Blanchard <anton@samba.org>2013-11-18 14:55:28 +1100
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2013-11-29 11:11:51 -0800
commit3ee8b4e1d91204180081d04c964ee5e0c7387f27 (patch)
tree9df9998e8cc242f9b069cdd8a979e1b6f7eb121e /arch/powerpc
parent36cfdef6ffa08c5f3b1f812332eddd8aa4d91ed2 (diff)
powerpc: ppc64 address space capped at 32TB, mmap randomisation disabled
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@samba.org> Acked-by: Michel Lespinasse <walken@google.com> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'arch/powerpc')
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/powerpc/mm/slice.c b/arch/powerpc/mm/slice.c
index 3e99c149271..7ce9cf3b698 100644
--- a/arch/powerpc/mm/slice.c
+++ b/arch/powerpc/mm/slice.c
@@ -258,7 +258,7 @@ static bool slice_scan_available(unsigned long addr,
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));