powerpc/32s: fix allow/prevent_user_access() when crossing segment boundaries.

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Make sure starting addr is aligned to segment boundary so that when
incrementing the segment, the starting address of the new segment is
below the end address. Otherwise the last segment might get  missed.

Fixes: a68c31fc01 ("powerpc/32s: Implement Kernel Userspace Access Protection")
Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/067a1b09f15f421d40797c2d04c22d4049a1cee8.1571071875.git.christophe.leroy@c-s.fr

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Christophe Leroy 2019-10-14 16:51:28 +00:00 • committed by Michael Ellerman

parent 2272905a45

commit d10f60ae27

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arch/powerpc/include/asm/book3s/32/kup.h

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