powerpc/44x: Implement Kernel Userspace Exec Protection (KUEP)

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Powerpc 44x has two bits for exec protection in TLBs: one
for user (UX) and one for superviser (SX).

Clear SX on user pages in TLB miss handlers to provide KUEP.

Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/169310e08152aa1d96c979770291d165ec6896ae.1622616032.git.christophe.leroy@csgroup.eu

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Christophe Leroy 2021-06-02 06:42:10 +00:00 • committed by Michael Ellerman

parent c0ca0fe08c

commit 10248dcba1

4 changed files with 23 additions and 0 deletions

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1

arch/powerpc/include/asm/nohash/32/mmu-44x.h

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8

arch/powerpc/kernel/head_44x.S

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13

arch/powerpc/mm/nohash/44x.c

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arch/powerpc/platforms/Kconfig.cputype

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