powerpc/mm: Implement STRICT_KERNEL_RWX on PPC32

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This patch implements STRICT_KERNEL_RWX on PPC32.

As for CONFIG_DEBUG_PAGEALLOC, it deactivates BAT and LTLB mappings
in order to allow page protection setup at the level of each page.

As BAT/LTLB mappings are deactivated, there might be a performance
impact.

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

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This commit is contained in:

Christophe Leroy 2017-08-02 15:51:05 +02:00 • committed by Michael Ellerman

parent 3184cc4b6f

commit 95902e6c88

4 changed files with 32 additions and 2 deletions

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2

arch/powerpc/Kconfig

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2

arch/powerpc/kernel/vmlinux.lds.S

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6

arch/powerpc/mm/init_32.c

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24

arch/powerpc/mm/pgtable_32.c

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