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[POWERPC] Fix size check for hugetlbfs

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My "slices" address space management code that was added in the 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>
This commit is contained in:
Benjamin Herrenschmidt 2007-08-08 15:44:15 +10:00 committed by Paul Mackerras
parent 8f2ea1fd3f
commit d1f5a77f2c
1 changed files with 2 additions and 0 deletions
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arch/powerpc/mm/slice.c
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@ -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))