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powerpc/44x: Implement Kernel Userspace Exec Protection (KUEP)
authorChristophe Leroy <christophe.leroy@csgroup.eu>
Wed, 2 Jun 2021 06:42:10 +0000 (06:42 +0000)
committerMichael Ellerman <mpe@ellerman.id.au>
Wed, 16 Jun 2021 14:09:07 +0000 (00:09 +1000)
commitd69c7722237d3712ad914c9299355d209534984e
tree47e29ca6d4f4828409d3c64d9a4f5493d13608fatree | snapshot
parent6ea39e364e62c960f610dfccde5b22cfe8274378commit | diff
powerpc/44x: Implement Kernel Userspace Exec Protection (KUEP)

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
arch/powerpc/include/asm/nohash/32/mmu-44x.h diff | blob | history
arch/powerpc/kernel/head_44x.S diff | blob | history
arch/powerpc/mm/nohash/44x.c diff | blob | history
arch/powerpc/platforms/Kconfig.cputype diff | blob | history
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