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powerpc: Add skeleton for Kernel Userspace Execution Prevention

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This patch adds a skeleton for Kernel Userspace Execution Prevention.

Then subarches implementing it have to define CONFIG_PPC_HAVE_KUEP
and provide setup_kuep() function.

Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
[mpe: Don't split strings, use pr_crit_ratelimited()]
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
This commit is contained in:
Christophe Leroy
2019-04-18 16:51:19 +10:00
committed by Michael Ellerman
parent 69795cabe4
commit 0fb1c25ab5
5 changed files with 34 additions and 6 deletions
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12
arch/powerpc/platforms/Kconfig.cputype
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@@ -345,6 +345,18 @@ config PPC_RADIX_MMU_DEFAULT
If you're unsure, say Y.
config PPC_HAVE_KUEP
bool
config PPC_KUEP
bool "Kernel Userspace Execution Prevention"
depends on PPC_HAVE_KUEP
default y
help
Enable support for Kernel Userspace Execution Prevention (KUEP)
If you're unsure, say Y.
config ARCH_ENABLE_HUGEPAGE_MIGRATION
def_bool y
depends on PPC_BOOK3S_64 && HUGETLB_PAGE && MIGRATION