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authorAnton Blanchard <anton@samba.org>2013-11-18 03:55:28 (GMT)
committerBenjamin Herrenschmidt <benh@kernel.crashing.org>2013-11-20 23:33:41 (GMT)
commit5a049f14902982c26538250bdc8d54156d357252 (patch)
tree32c5263ce80a6d96ec35a66edac9ec6e97774944
parent6d888d1ab0000dff8ea2901bcdf5d213f2a54e8b (diff)
downloadlinux-5a049f14902982c26538250bdc8d54156d357252.tar.xz
powerpc: ppc64 address space capped at 32TB, mmap randomisation disabled
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. Cc: stable@vger.kernel.org # v3.10+ Signed-off-by: Anton Blanchard <anton@samba.org> Acked-by: Michel Lespinasse <walken@google.com> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
-rw-r--r--arch/powerpc/mm/slice.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/powerpc/mm/slice.c b/arch/powerpc/mm/slice.c
index 3e99c14..7ce9cf3 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));
}
}