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authorBenjamin Herrenschmidt <benh@kernel.crashing.org>2007-08-08 15:44:15 +1000
committerGreg Kroah-Hartman <gregkh@suse.de>2007-08-15 09:25:09 -0700
commit51a718fdf27c4bf61936f146516b9f623b4e9875 (patch)
tree5702925216e0a7f609e8cdbafae7dc671e8c3e93 /arch
parent58a2ed923de07dcec6bd8159a060ddce3ee7e08b (diff)
powerpc: Fix size check for hugetlbfs
My "slices" address space management code that was added in 2.6.22 implementation of get_unmapped_area() doesn't properly check that the size is a multiple of the requested page size. This allows userland to create VMAs that aren't a multiple of the huge page size with hugetlbfs (since hugetlbfs entirely relies on get_unmapped_area() to do that checking) which leads to a kernel BUG() when such areas are torn down. Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> Signed-off-by: Paul Mackerras <paulus@samba.org> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'arch')
-rw-r--r--arch/powerpc/mm/slice.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/arch/powerpc/mm/slice.c b/arch/powerpc/mm/slice.c
index f833dba2a028..d5fd3909d13a 100644
--- a/arch/powerpc/mm/slice.c
+++ b/arch/powerpc/mm/slice.c
@@ -405,6 +405,8 @@ unsigned long slice_get_unmapped_area(unsigned long addr, unsigned long len,
if (len > mm->task_size)
return -ENOMEM;
+ if (len & ((1ul << pshift) - 1))
+ return -EINVAL;
if (fixed && (addr & ((1ul << pshift) - 1)))
return -EINVAL;
if (fixed && addr > (mm->task_size - len))