powerpc: Add framework for Kernel Userspace Protection

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This patch adds a skeleton for Kernel Userspace Protection
functionnalities like Kernel Userspace Access Protection and Kernel
Userspace Execution Prevention

The subsequent implementation of KUAP for radix makes use of a MMU
feature in order to patch out assembly when KUAP is disabled or
unsupported. This won't work unless there's an entry point for KUP
support before the feature magic happens, so for PPC64 setup_kup() is
called early in setup.

On PPC32, feature_fixup() is done too early to allow the same.

Suggested-by: Russell Currey <ruscur@russell.cc>
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 2019-04-18 16:51:18 +10:00 • committed by Michael Ellerman

parent 53a712bae5

commit 69795cabe4

4 changed files with 26 additions and 0 deletions

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11

arch/powerpc/include/asm/kup.h

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7

arch/powerpc/kernel/setup_64.c

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5

arch/powerpc/mm/init-common.c

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3

arch/powerpc/mm/init_32.c

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