powerpc/64s/radix: Fix 128TB-512TB virtual address boundary case allocation

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commit 85e3f1adcb upstream.

Radix VA space allocations test addresses against mm->task_size which
is 512TB, even in cases where the intention is to limit allocation to
below 128TB.

This results in mmap with a hint address below 128TB but address +
length above 128TB succeeding when it should fail (as hash does after
the previous patch).

Set the high address limit to be considered up front, and base
subsequent allocation checks on that consistently.

Fixes: f4ea6dcb08 ("powerpc/mm: Enable mappings above 128TB")
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Reviewed-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

...

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Nicholas Piggin 2017-11-10 04:27:39 +11:00 • committed by Greg Kroah-Hartman

parent cee5a6e8c3

commit de9c35508f

2 changed files with 50 additions and 31 deletions

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26

arch/powerpc/mm/hugetlbpage-radix.c

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55

arch/powerpc/mm/mmap.c

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