powerpc/32s: map kasan zero shadow with PAGE_READONLY instead of PAGE_KERNEL_RO

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For hash32, the zero shadow page gets mapped with PAGE_READONLY instead
of PAGE_KERNEL_RO, because the PP bits don't provide a RO kernel, so
PAGE_KERNEL_RO is equivalent to PAGE_KERNEL. By using PAGE_READONLY,
the page is RO for both kernel and user, but this is not a security issue
as it contains only zeroes.

Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

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Christophe Leroy 2019-04-26 16:23:37 +00:00 • committed by Michael Ellerman

parent 215b823707

commit da3a3b0a0e

1 changed files with 8 additions and 2 deletions

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arch/powerpc/mm/kasan/kasan_init_32.c

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